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/* read.c - read a source file - Copyright 1986, 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. This file is part of GAS, the GNU Assembler. GAS is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GAS is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GAS; see the file COPYING. If not, write to the Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ /* If your chars aren't 8 bits, you will change this a bit (eg. to 0xFF). But then, GNU isn't spozed to run on your machine anyway. (RMS is so shortsighted sometimes.) */ #define MASK_CHAR ((int)(unsigned char) -1) /* This is the largest known floating point format (for now). It will grow when we do 4361 style flonums. */ #define MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT (16) /* Routines that read assembler source text to build spaghetti in memory. Another group of these functions is in the expr.c module. */ #include "as.h" #include "safe-ctype.h" #include "subsegs.h" #include "sb.h" #include "macro.h" #include "obstack.h" #include "ecoff.h" #include "dw2gencfi.h" #ifndef TC_START_LABEL #define TC_START_LABEL(x,y,z) (x == ':') #endif /* Set by the object-format or the target. */ #ifndef TC_IMPLICIT_LCOMM_ALIGNMENT #define TC_IMPLICIT_LCOMM_ALIGNMENT(SIZE, P2VAR) \ do \ { \ if ((SIZE) >= 8) \ (P2VAR) = 3; \ else if ((SIZE) >= 4) \ (P2VAR) = 2; \ else if ((SIZE) >= 2) \ (P2VAR) = 1; \ else \ (P2VAR) = 0; \ } \ while (0) #endif char *input_line_pointer; /*->next char of source file to parse. */ #if BITS_PER_CHAR != 8 /* The following table is indexed by[(char)] and will break if a char does not have exactly 256 states (hopefully 0:255!)! */ die horribly; #endif #ifndef LEX_AT #define LEX_AT 0 #endif #ifndef LEX_BR /* The RS/6000 assembler uses {,},[,] as parts of symbol names. */ #define LEX_BR 0 #endif #ifndef LEX_PCT /* The Delta 68k assembler permits % inside label names. */ #define LEX_PCT 0 #endif #ifndef LEX_QM /* The PowerPC Windows NT assemblers permits ? inside label names. */ #define LEX_QM 0 #endif #ifndef LEX_HASH /* The IA-64 assembler uses # as a suffix designating a symbol. We include it in the symbol and strip it out in tc_canonicalize_symbol_name. */ #define LEX_HASH 0 #endif #ifndef LEX_DOLLAR #define LEX_DOLLAR 3 #endif #ifndef LEX_TILDE /* The Delta 68k assembler permits ~ at start of label names. */ #define LEX_TILDE 0 #endif /* Used by is_... macros. our ctype[]. */ char lex_type[256] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* @ABCDEFGHIJKLMNO */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* PQRSTUVWXYZ[\]^_ */ 0, 0, 0, LEX_HASH, LEX_DOLLAR, LEX_PCT, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, /* _!"#$%&'()*+,-./ */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, LEX_QM, /* 0123456789:;<=>? */ LEX_AT, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* @ABCDEFGHIJKLMNO */ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, LEX_BR, 0, LEX_BR, 0, 3, /* PQRSTUVWXYZ[\]^_ */ 0, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* `abcdefghijklmno */ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, LEX_BR, 0, LEX_BR, LEX_TILDE, 0, /* pqrstuvwxyz{|}~. */ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3 }; /* In: a character. Out: 1 if this character ends a line. 2 if this character is a line separator. */ char is_end_of_line[256] = { #ifdef CR_EOL 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, /* @abcdefghijklmno */ #else 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, /* @abcdefghijklmno */ #endif 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* _!"#$%&'()*+,-./ */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0123456789:;<=>? */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 /* */ }; #ifndef TC_CASE_SENSITIVE char original_case_string[128]; #endif /* Functions private to this file. */ static char *buffer; /* 1st char of each buffer of lines is here. */ static char *buffer_limit; /*->1 + last char in buffer. */ /* TARGET_BYTES_BIG_ENDIAN is required to be defined to either 0 or 1 in the tc-<CPU>.h file. See the "Porting GAS" section of the internals manual. */ int target_big_endian = TARGET_BYTES_BIG_ENDIAN; /* Variables for handling include file directory table. */ /* Table of pointers to directories to search for .include's. */ char **include_dirs; /* How many are in the table. */ int include_dir_count; /* Length of longest in table. */ int include_dir_maxlen = 1; #ifndef WORKING_DOT_WORD struct broken_word *broken_words; int new_broken_words; #endif /* The current offset into the absolute section. We don't try to build frags in the absolute section, since no data can be stored there. We just keep track of the current offset. */ addressT abs_section_offset; /* If this line had an MRI style label, it is stored in this variable. This is used by some of the MRI pseudo-ops. */ symbolS *line_label; /* This global variable is used to support MRI common sections. We translate such sections into a common symbol. This variable is non-NULL when we are in an MRI common section. */ symbolS *mri_common_symbol; /* In MRI mode, after a dc.b pseudo-op with an odd number of bytes, we need to align to an even byte boundary unless the next pseudo-op is dc.b, ds.b, or dcb.b. This variable is set to 1 if an alignment may be needed. */ static int mri_pending_align; #ifndef NO_LISTING #ifdef OBJ_ELF /* This variable is set to be non-zero if the next string we see might be the name of the source file in DWARF debugging information. See the comment in emit_expr for the format we look for. */ static int dwarf_file_string; #endif #endif static void do_s_func (int end_p, const char *default_prefix); static void do_align (int, char *, int, int); static void s_align (int, int); static void s_altmacro (int); static void s_bad_end (int); #ifdef OBJ_ELF static void s_gnu_attribute (int); #endif static void s_reloc (int); static int hex_float (int, char *); static segT get_known_segmented_expression (expressionS * expP); static void pobegin (void); static int get_non_macro_line_sb (sb *); static void generate_file_debug (void); static char *_find_end_of_line (char *, int, int, int); void read_begin (void) { const char *p; pobegin (); obj_read_begin_hook (); /* Something close -- but not too close -- to a multiple of 1024. The debugging malloc I'm using has 24 bytes of overhead. */ obstack_begin (¬es, chunksize); obstack_begin (&cond_obstack, chunksize); /* Use machine dependent syntax. */ for (p = line_separator_chars; *p; p++) is_end_of_line[(unsigned char) *p] = 2; /* Use more. FIXME-SOMEDAY. */ if (flag_mri) lex_type['?'] = 3; } #ifndef TC_ADDRESS_BYTES #define TC_ADDRESS_BYTES address_bytes static inline int address_bytes (void) { /* Choose smallest of 1, 2, 4, 8 bytes that is large enough to contain an address. */ int n = (stdoutput->arch_info->bits_per_address - 1) / 8; n |= n >> 1; n |= n >> 2; n += 1; return n; } #endif /* Set up pseudo-op tables. */ static struct hash_control *po_hash; static const pseudo_typeS potable[] = { {"abort", s_abort, 0}, {"align", s_align_ptwo, 0}, {"altmacro", s_altmacro, 1}, {"ascii", stringer, 8+0}, {"asciz", stringer, 8+1}, {"balign", s_align_bytes, 0}, {"balignw", s_align_bytes, -2}, {"balignl", s_align_bytes, -4}, /* block */ {"byte", cons, 1}, {"comm", s_comm, 0}, {"common", s_mri_common, 0}, {"common.s", s_mri_common, 1}, {"data", s_data, 0}, {"dc", cons, 2}, #ifdef TC_ADDRESS_BYTES {"dc.a", cons, 0}, #endif {"dc.b", cons, 1}, {"dc.d", float_cons, 'd'}, {"dc.l", cons, 4}, {"dc.s", float_cons, 'f'}, {"dc.w", cons, 2}, {"dc.x", float_cons, 'x'}, {"dcb", s_space, 2}, {"dcb.b", s_space, 1}, {"dcb.d", s_float_space, 'd'}, {"dcb.l", s_space, 4}, {"dcb.s", s_float_space, 'f'}, {"dcb.w", s_space, 2}, {"dcb.x", s_float_space, 'x'}, {"ds", s_space, 2}, {"ds.b", s_space, 1}, {"ds.d", s_space, 8}, {"ds.l", s_space, 4}, {"ds.p", s_space, 12}, {"ds.s", s_space, 4}, {"ds.w", s_space, 2}, {"ds.x", s_space, 12}, {"debug", s_ignore, 0}, #ifdef S_SET_DESC {"desc", s_desc, 0}, #endif /* dim */ {"double", float_cons, 'd'}, /* dsect */ {"eject", listing_eject, 0}, /* Formfeed listing. */ {"else", s_else, 0}, {"elsec", s_else, 0}, {"elseif", s_elseif, (int) O_ne}, {"end", s_end, 0}, {"endc", s_endif, 0}, {"endfunc", s_func, 1}, {"endif", s_endif, 0}, {"endm", s_bad_end, 0}, {"endr", s_bad_end, 1}, /* endef */ {"equ", s_set, 0}, {"equiv", s_set, 1}, {"eqv", s_set, -1}, {"err", s_err, 0}, {"error", s_errwarn, 1}, {"exitm", s_mexit, 0}, /* extend */ {"extern", s_ignore, 0}, /* We treat all undef as ext. */ {"appfile", s_app_file, 1}, {"appline", s_app_line, 1}, {"fail", s_fail, 0}, {"file", s_app_file, 0}, {"fill", s_fill, 0}, {"float", float_cons, 'f'}, {"format", s_ignore, 0}, {"func", s_func, 0}, {"global", s_globl, 0}, {"globl", s_globl, 0}, #ifdef OBJ_ELF {"gnu_attribute", s_gnu_attribute, 0}, #endif {"hword", cons, 2}, {"if", s_if, (int) O_ne}, {"ifb", s_ifb, 1}, {"ifc", s_ifc, 0}, {"ifdef", s_ifdef, 0}, {"ifeq", s_if, (int) O_eq}, {"ifeqs", s_ifeqs, 0}, {"ifge", s_if, (int) O_ge}, {"ifgt", s_if, (int) O_gt}, {"ifle", s_if, (int) O_le}, {"iflt", s_if, (int) O_lt}, {"ifnb", s_ifb, 0}, {"ifnc", s_ifc, 1}, {"ifndef", s_ifdef, 1}, {"ifne", s_if, (int) O_ne}, {"ifnes", s_ifeqs, 1}, {"ifnotdef", s_ifdef, 1}, {"incbin", s_incbin, 0}, {"include", s_include, 0}, {"int", cons, 4}, {"irp", s_irp, 0}, {"irep", s_irp, 0}, {"irpc", s_irp, 1}, {"irepc", s_irp, 1}, {"lcomm", s_lcomm, 0}, {"lflags", s_ignore, 0}, /* Listing flags. */ {"linefile", s_app_line, 0}, {"linkonce", s_linkonce, 0}, {"list", listing_list, 1}, /* Turn listing on. */ {"llen", listing_psize, 1}, {"long", cons, 4}, {"lsym", s_lsym, 0}, {"macro", s_macro, 0}, {"mexit", s_mexit, 0}, {"mri", s_mri, 0}, {".mri", s_mri, 0}, /* Special case so .mri works in MRI mode. */ {"name", s_ignore, 0}, {"noaltmacro", s_altmacro, 0}, {"noformat", s_ignore, 0}, {"nolist", listing_list, 0}, /* Turn listing off. */ {"nopage", listing_nopage, 0}, {"octa", cons, 16}, {"offset", s_struct, 0}, {"org", s_org, 0}, {"p2align", s_align_ptwo, 0}, {"p2alignw", s_align_ptwo, -2}, {"p2alignl", s_align_ptwo, -4}, {"page", listing_eject, 0}, {"plen", listing_psize, 0}, {"print", s_print, 0}, {"psize", listing_psize, 0}, /* Set paper size. */ {"purgem", s_purgem, 0}, {"quad", cons, 8}, {"reloc", s_reloc, 0}, {"rep", s_rept, 0}, {"rept", s_rept, 0}, {"rva", s_rva, 4}, {"sbttl", listing_title, 1}, /* Subtitle of listing. */ /* scl */ /* sect */ {"set", s_set, 0}, {"short", cons, 2}, {"single", float_cons, 'f'}, /* size */ {"space", s_space, 0}, {"skip", s_space, 0}, {"sleb128", s_leb128, 1}, {"spc", s_ignore, 0}, {"stabd", s_stab, 'd'}, {"stabn", s_stab, 'n'}, {"stabs", s_stab, 's'}, {"string", stringer, 8+1}, {"string8", stringer, 8+1}, {"string16", stringer, 16+1}, {"string32", stringer, 32+1}, {"string64", stringer, 64+1}, {"struct", s_struct, 0}, /* tag */ {"text", s_text, 0}, /* This is for gcc to use. It's only just been added (2/94), so gcc won't be able to use it for a while -- probably a year or more. But once this has been released, check with gcc maintainers before deleting it or even changing the spelling. */ {"this_GCC_requires_the_GNU_assembler", s_ignore, 0}, /* If we're folding case -- done for some targets, not necessarily all -- the above string in an input file will be converted to this one. Match it either way... */ {"this_gcc_requires_the_gnu_assembler", s_ignore, 0}, {"title", listing_title, 0}, /* Listing title. */ {"ttl", listing_title, 0}, /* type */ {"uleb128", s_leb128, 0}, /* use */ /* val */ {"xcom", s_comm, 0}, {"xdef", s_globl, 0}, {"xref", s_ignore, 0}, {"xstabs", s_xstab, 's'}, {"warning", s_errwarn, 0}, {"weakref", s_weakref, 0}, {"word", cons, 2}, {"zero", s_space, 0}, {NULL, NULL, 0} /* End sentinel. */ }; static offsetT get_absolute_expr (expressionS *exp) { expression_and_evaluate (exp); if (exp->X_op != O_constant) { if (exp->X_op != O_absent) as_bad (_("bad or irreducible absolute expression")); exp->X_add_number = 0; } return exp->X_add_number; } offsetT get_absolute_expression (void) { expressionS exp; return get_absolute_expr (&exp); } static int pop_override_ok = 0; static const char *pop_table_name; void pop_insert (const pseudo_typeS *table) { const char *errtxt; const pseudo_typeS *pop; for (pop = table; pop->poc_name; pop++) { errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop); if (errtxt && (!pop_override_ok || strcmp (errtxt, "exists"))) as_fatal (_("error constructing %s pseudo-op table: %s"), pop_table_name, errtxt); } } #ifndef md_pop_insert #define md_pop_insert() pop_insert(md_pseudo_table) #endif #ifndef obj_pop_insert #define obj_pop_insert() pop_insert(obj_pseudo_table) #endif #ifndef cfi_pop_insert #define cfi_pop_insert() pop_insert(cfi_pseudo_table) #endif static void pobegin (void) { po_hash = hash_new (); /* Do the target-specific pseudo ops. */ pop_table_name = "md"; md_pop_insert (); /* Now object specific. Skip any that were in the target table. */ pop_table_name = "obj"; pop_override_ok = 1; obj_pop_insert (); /* Now portable ones. Skip any that we've seen already. */ pop_table_name = "standard"; pop_insert (potable); /* Now CFI ones. */ pop_table_name = "cfi"; pop_override_ok = 1; cfi_pop_insert (); } #define HANDLE_CONDITIONAL_ASSEMBLY() \ if (ignore_input ()) \ { \ char *eol = find_end_of_line (input_line_pointer, flag_m68k_mri); \ input_line_pointer = (input_line_pointer <= buffer_limit \ && eol >= buffer_limit) \ ? buffer_limit \ : eol + 1; \ continue; \ } /* This function is used when scrubbing the characters between #APP and #NO_APP. */ static char *scrub_string; static char *scrub_string_end; static int scrub_from_string (char *buf, int buflen) { int copy; copy = scrub_string_end - scrub_string; if (copy > buflen) copy = buflen; memcpy (buf, scrub_string, copy); scrub_string += copy; return copy; } /* Helper function of read_a_source_file, which tries to expand a macro. */ static int try_macro (char term, const char *line) { sb out; const char *err; macro_entry *macro; if (check_macro (line, &out, &err, ¯o)) { if (err != NULL) as_bad ("%s", err); *input_line_pointer++ = term; input_scrub_include_sb (&out, input_line_pointer, 1); sb_kill (&out); buffer_limit = input_scrub_next_buffer (&input_line_pointer); #ifdef md_macro_info md_macro_info (macro); #endif return 1; } return 0; } /* We read the file, putting things into a web that represents what we have been reading. */ void read_a_source_file (char *name) { char c; char *s; /* String of symbol, '\0' appended. */ int temp; pseudo_typeS *pop; #ifdef WARN_COMMENTS found_comment = 0; #endif buffer = input_scrub_new_file (name); listing_file (name); listing_newline (NULL); register_dependency (name); /* Generate debugging information before we've read anything in to denote this file as the "main" source file and not a subordinate one (e.g. N_SO vs N_SOL in stabs). */ generate_file_debug (); while ((buffer_limit = input_scrub_next_buffer (&input_line_pointer)) != 0) { /* We have another line to parse. */ #ifndef NO_LISTING /* In order to avoid listing macro expansion lines with labels multiple times, keep track of which line was last issued. */ static char *last_eol; last_eol = NULL; #endif while (input_line_pointer < buffer_limit) { bfd_boolean was_new_line; /* We have more of this buffer to parse. */ /* We now have input_line_pointer->1st char of next line. If input_line_pointer [-1] == '\n' then we just scanned another line: so bump line counters. */ was_new_line = is_end_of_line[(unsigned char) input_line_pointer[-1]]; if (was_new_line) { symbol_set_value_now (&dot_symbol); #ifdef md_start_line_hook md_start_line_hook (); #endif if (input_line_pointer[-1] == '\n') bump_line_counters (); } #ifndef NO_LISTING /* If listing is on, and we are expanding a macro, then give the listing code the contents of the expanded line. */ if (listing) { if ((listing & LISTING_MACEXP) && macro_nest > 0) { /* Find the end of the current expanded macro line. */ s = find_end_of_line (input_line_pointer, flag_m68k_mri); if (s != last_eol) { char *copy; int len; last_eol = s; /* Copy it for safe keeping. Also give an indication of how much macro nesting is involved at this point. */ len = s - input_line_pointer; copy = (char *) xmalloc (len + macro_nest + 2); memset (copy, '>', macro_nest); copy[macro_nest] = ' '; memcpy (copy + macro_nest + 1, input_line_pointer, len); copy[macro_nest + 1 + len] = '\0'; /* Install the line with the listing facility. */ listing_newline (copy); } } else listing_newline (NULL); } #endif if (was_new_line) { line_label = NULL; if (LABELS_WITHOUT_COLONS || flag_m68k_mri) { /* Text at the start of a line must be a label, we run down and stick a colon in. */ if (is_name_beginner (*input_line_pointer)) { char *line_start = input_line_pointer; int mri_line_macro; HANDLE_CONDITIONAL_ASSEMBLY (); c = get_symbol_end (); /* In MRI mode, the EQU and MACRO pseudoops must be handled specially. */ mri_line_macro = 0; if (flag_m68k_mri) { char *rest = input_line_pointer + 1; if (*rest == ':') ++rest; if (*rest == ' ' || *rest == '\t') ++rest; if ((strncasecmp (rest, "EQU", 3) == 0 || strncasecmp (rest, "SET", 3) == 0) && (rest[3] == ' ' || rest[3] == '\t')) { input_line_pointer = rest + 3; equals (line_start, strncasecmp (rest, "SET", 3) == 0); continue; } if (strncasecmp (rest, "MACRO", 5) == 0 && (rest[5] == ' ' || rest[5] == '\t' || is_end_of_line[(unsigned char) rest[5]])) mri_line_macro = 1; } /* In MRI mode, we need to handle the MACRO pseudo-op specially: we don't want to put the symbol in the symbol table. */ if (!mri_line_macro #ifdef TC_START_LABEL_WITHOUT_COLON && TC_START_LABEL_WITHOUT_COLON(c, input_line_pointer) #endif ) line_label = colon (line_start); else line_label = symbol_create (line_start, absolute_section, (valueT) 0, &zero_address_frag); *input_line_pointer = c; if (c == ':') input_line_pointer++; } } } /* We are at the beginning of a line, or similar place. We expect a well-formed assembler statement. A "symbol-name:" is a statement. Depending on what compiler is used, the order of these tests may vary to catch most common case 1st. Each test is independent of all other tests at the (top) level. */ do c = *input_line_pointer++; while (c == '\t' || c == ' ' || c == '\f'); /* C is the 1st significant character. Input_line_pointer points after that character. */ if (is_name_beginner (c)) { /* Want user-defined label or pseudo/opcode. */ HANDLE_CONDITIONAL_ASSEMBLY (); s = --input_line_pointer; c = get_symbol_end (); /* name's delimiter. */ /* C is character after symbol. That character's place in the input line is now '\0'. S points to the beginning of the symbol. [In case of pseudo-op, s->'.'.] Input_line_pointer->'\0' where c was. */ if (TC_START_LABEL (c, s, input_line_pointer)) { if (flag_m68k_mri) { char *rest = input_line_pointer + 1; /* In MRI mode, \tsym: set 0 is permitted. */ if (*rest == ':') ++rest; if (*rest == ' ' || *rest == '\t') ++rest; if ((strncasecmp (rest, "EQU", 3) == 0 || strncasecmp (rest, "SET", 3) == 0) && (rest[3] == ' ' || rest[3] == '\t')) { input_line_pointer = rest + 3; equals (s, 1); continue; } } line_label = colon (s); /* User-defined label. */ /* Put ':' back for error messages' sake. */ *input_line_pointer++ = ':'; #ifdef tc_check_label tc_check_label (line_label); #endif /* Input_line_pointer->after ':'. */ SKIP_WHITESPACE (); } else if ((c == '=' && input_line_pointer[1] == '=') || ((c == ' ' || c == '\t') && input_line_pointer[1] == '=' && input_line_pointer[2] == '=')) { equals (s, -1); demand_empty_rest_of_line (); } else if ((c == '=' || ((c == ' ' || c == '\t') && input_line_pointer[1] == '=')) #ifdef TC_EQUAL_IN_INSN && !TC_EQUAL_IN_INSN (c, s) #endif ) { equals (s, 1); demand_empty_rest_of_line (); } else { /* Expect pseudo-op or machine instruction. */ pop = NULL; #ifndef TC_CASE_SENSITIVE { char *s2 = s; strncpy (original_case_string, s2, sizeof (original_case_string)); original_case_string[sizeof (original_case_string) - 1] = 0; while (*s2) { *s2 = TOLOWER (*s2); s2++; } } #endif if (NO_PSEUDO_DOT || flag_m68k_mri) { /* The MRI assembler uses pseudo-ops without a period. */ pop = (pseudo_typeS *) hash_find (po_hash, s); if (pop != NULL && pop->poc_handler == NULL) pop = NULL; } if (pop != NULL || (!flag_m68k_mri && *s == '.')) { /* PSEUDO - OP. WARNING: c has next char, which may be end-of-line. We lookup the pseudo-op table with s+1 because we already know that the pseudo-op begins with a '.'. */ if (pop == NULL) pop = (pseudo_typeS *) hash_find (po_hash, s + 1); if (pop && !pop->poc_handler) pop = NULL; /* In MRI mode, we may need to insert an automatic alignment directive. What a hack this is. */ if (mri_pending_align && (pop == NULL || !((pop->poc_handler == cons && pop->poc_val == 1) || (pop->poc_handler == s_space && pop->poc_val == 1) #ifdef tc_conditional_pseudoop || tc_conditional_pseudoop (pop) #endif || pop->poc_handler == s_if || pop->poc_handler == s_ifdef || pop->poc_handler == s_ifc || pop->poc_handler == s_ifeqs || pop->poc_handler == s_else || pop->poc_handler == s_endif || pop->poc_handler == s_globl || pop->poc_handler == s_ignore))) { do_align (1, (char *) NULL, 0, 0); mri_pending_align = 0; if (line_label != NULL) { symbol_set_frag (line_label, frag_now); S_SET_VALUE (line_label, frag_now_fix ()); } } /* Print the error msg now, while we still can. */ if (pop == NULL) { char *end = input_line_pointer; *input_line_pointer = c; s_ignore (0); c = *--input_line_pointer; *input_line_pointer = '\0'; if (! macro_defined || ! try_macro (c, s)) { *end = '\0'; as_bad (_("unknown pseudo-op: `%s'"), s); *input_line_pointer++ = c; } continue; } /* Put it back for error messages etc. */ *input_line_pointer = c; /* The following skip of whitespace is compulsory. A well shaped space is sometimes all that separates keyword from operands. */ if (c == ' ' || c == '\t') input_line_pointer++; /* Input_line is restored. Input_line_pointer->1st non-blank char after pseudo-operation. */ (*pop->poc_handler) (pop->poc_val); /* If that was .end, just get out now. */ if (pop->poc_handler == s_end) goto quit; } else { /* WARNING: c has char, which may be end-of-line. */ /* Also: input_line_pointer->`\0` where c was. */ *input_line_pointer = c; input_line_pointer = _find_end_of_line (input_line_pointer, flag_m68k_mri, 1, 0); c = *input_line_pointer; *input_line_pointer = '\0'; generate_lineno_debug (); if (macro_defined && try_macro (c, s)) continue; if (mri_pending_align) { do_align (1, (char *) NULL, 0, 0); mri_pending_align = 0; if (line_label != NULL) { symbol_set_frag (line_label, frag_now); S_SET_VALUE (line_label, frag_now_fix ()); } } md_assemble (s); /* Assemble 1 instruction. */ *input_line_pointer++ = c; /* We resume loop AFTER the end-of-line from this instruction. */ } } continue; } /* Empty statement? */ if (is_end_of_line[(unsigned char) c]) continue; if ((LOCAL_LABELS_DOLLAR || LOCAL_LABELS_FB) && ISDIGIT (c)) { /* local label ("4:") */ char *backup = input_line_pointer; HANDLE_CONDITIONAL_ASSEMBLY (); temp = c - '0'; /* Read the whole number. */ while (ISDIGIT (*input_line_pointer)) { temp = (temp * 10) + *input_line_pointer - '0'; ++input_line_pointer; } if (LOCAL_LABELS_DOLLAR && *input_line_pointer == '$' && *(input_line_pointer + 1) == ':') { input_line_pointer += 2; if (dollar_label_defined (temp)) { as_fatal (_("label \"%d$\" redefined"), temp); } define_dollar_label (temp); colon (dollar_label_name (temp, 0)); continue; } if (LOCAL_LABELS_FB && *input_line_pointer++ == ':') { fb_label_instance_inc (temp); colon (fb_label_name (temp, 0)); continue; } input_line_pointer = backup; } /* local label ("4:") */ if (c && strchr (line_comment_chars, c)) { /* Its a comment. Better say APP or NO_APP. */ sb sbuf; char *ends; char *new_buf; char *new_tmp; unsigned int new_length; char *tmp_buf = 0; s = input_line_pointer; if (strncmp (s, "APP\n", 4)) { /* We ignore it. */ ignore_rest_of_line (); continue; } bump_line_counters (); s += 4; sb_new (&sbuf); ends = strstr (s, "#NO_APP\n"); if (!ends) { unsigned int tmp_len; unsigned int num; /* The end of the #APP wasn't in this buffer. We keep reading in buffers until we find the #NO_APP that goes with this #APP There is one. The specs guarantee it... */ tmp_len = buffer_limit - s; tmp_buf = (char *) xmalloc (tmp_len + 1); memcpy (tmp_buf, s, tmp_len); do { new_tmp = input_scrub_next_buffer (&buffer); if (!new_tmp) break; else buffer_limit = new_tmp; input_line_pointer = buffer; ends = strstr (buffer, "#NO_APP\n"); if (ends) num = ends - buffer; else num = buffer_limit - buffer; tmp_buf = (char *) xrealloc (tmp_buf, tmp_len + num); memcpy (tmp_buf + tmp_len, buffer, num); tmp_len += num; } while (!ends); input_line_pointer = ends ? ends + 8 : NULL; s = tmp_buf; ends = s + tmp_len; } else { input_line_pointer = ends + 8; } scrub_string = s; scrub_string_end = ends; new_length = ends - s; new_buf = (char *) xmalloc (new_length); new_tmp = new_buf; for (;;) { int space; int size; space = (new_buf + new_length) - new_tmp; size = do_scrub_chars (scrub_from_string, new_tmp, space); if (size < space) { new_tmp[size] = 0; break; } new_buf = (char *) xrealloc (new_buf, new_length + 100); new_tmp = new_buf + new_length; new_length += 100; } if (tmp_buf) free (tmp_buf); /* We've "scrubbed" input to the preferred format. In the process we may have consumed the whole of the remaining file (and included files). We handle this formatted input similar to that of macro expansion, letting actual macro expansion (possibly nested) and other input expansion work. Beware that in messages, line numbers and possibly file names will be incorrect. */ sb_add_string (&sbuf, new_buf); input_scrub_include_sb (&sbuf, input_line_pointer, 0); sb_kill (&sbuf); buffer_limit = input_scrub_next_buffer (&input_line_pointer); free (new_buf); continue; } HANDLE_CONDITIONAL_ASSEMBLY (); #ifdef tc_unrecognized_line if (tc_unrecognized_line (c)) continue; #endif input_line_pointer--; /* Report unknown char as error. */ demand_empty_rest_of_line (); } } quit: symbol_set_value_now (&dot_symbol); #ifdef md_cleanup md_cleanup (); #endif /* Close the input file. */ input_scrub_close (); #ifdef WARN_COMMENTS { if (warn_comment && found_comment) as_warn_where (found_comment_file, found_comment, "first comment found here"); } #endif } /* Convert O_constant expression EXP into the equivalent O_big representation. Take the sign of the number from X_unsigned rather than X_add_number. */ static void convert_to_bignum (expressionS *exp) { valueT value; unsigned int i; value = exp->X_add_number; for (i = 0; i < sizeof (exp->X_add_number) / CHARS_PER_LITTLENUM; i++) { generic_bignum[i] = value & LITTLENUM_MASK; value >>= LITTLENUM_NUMBER_OF_BITS; } /* Add a sequence of sign bits if the top bit of X_add_number is not the sign of the original value. */ if ((exp->X_add_number < 0) != !exp->X_unsigned) generic_bignum[i++] = exp->X_unsigned ? 0 : LITTLENUM_MASK; exp->X_op = O_big; exp->X_add_number = i; } /* For most MRI pseudo-ops, the line actually ends at the first nonquoted space. This function looks for that point, stuffs a null in, and sets *STOPCP to the character that used to be there, and returns the location. Until I hear otherwise, I am going to assume that this is only true for the m68k MRI assembler. */ char * mri_comment_field (char *stopcp) { char *s; #ifdef TC_M68K int inquote = 0; know (flag_m68k_mri); for (s = input_line_pointer; ((!is_end_of_line[(unsigned char) *s] && *s != ' ' && *s != '\t') || inquote); s++) { if (*s == '\'') inquote = !inquote; } #else for (s = input_line_pointer; !is_end_of_line[(unsigned char) *s]; s++) ; #endif *stopcp = *s; *s = '\0'; return s; } /* Skip to the end of an MRI comment field. */ void mri_comment_end (char *stop, int stopc) { know (flag_mri); input_line_pointer = stop; *stop = stopc; while (!is_end_of_line[(unsigned char) *input_line_pointer]) ++input_line_pointer; } void s_abort (int ignore ATTRIBUTE_UNUSED) { as_fatal (_(".abort detected. Abandoning ship.")); } /* Guts of .align directive. N is the power of two to which to align. FILL may be NULL, or it may point to the bytes of the fill pattern. LEN is the length of whatever FILL points to, if anything. MAX is the maximum number of characters to skip when doing the alignment, or 0 if there is no maximum. */ static void do_align (int n, char *fill, int len, int max) { if (now_seg == absolute_section) { if (fill != NULL) while (len-- > 0) if (*fill++ != '\0') { as_warn (_("ignoring fill value in absolute section")); break; } fill = NULL; len = 0; } #ifdef md_flush_pending_output md_flush_pending_output (); #endif #ifdef md_do_align md_do_align (n, fill, len, max, just_record_alignment); #endif /* Only make a frag if we HAVE to... */ if (n != 0 && !need_pass_2) { if (fill == NULL) { if (subseg_text_p (now_seg)) frag_align_code (n, max); else frag_align (n, 0, max); } else if (len <= 1) frag_align (n, *fill, max); else frag_align_pattern (n, fill, len, max); } #ifdef md_do_align just_record_alignment: ATTRIBUTE_UNUSED_LABEL #endif record_alignment (now_seg, n - OCTETS_PER_BYTE_POWER); } /* Handle the .align pseudo-op. A positive ARG is a default alignment (in bytes). A negative ARG is the negative of the length of the fill pattern. BYTES_P is non-zero if the alignment value should be interpreted as the byte boundary, rather than the power of 2. */ #ifndef TC_ALIGN_LIMIT #define TC_ALIGN_LIMIT (stdoutput->arch_info->bits_per_address - 1) #endif static void s_align (int arg, int bytes_p) { unsigned int align_limit = TC_ALIGN_LIMIT; unsigned int align; char *stop = NULL; char stopc = 0; offsetT fill = 0; int max; int fill_p; if (flag_mri) stop = mri_comment_field (&stopc); if (is_end_of_line[(unsigned char) *input_line_pointer]) { if (arg < 0) align = 0; else align = arg; /* Default value from pseudo-op table. */ } else { align = get_absolute_expression (); SKIP_WHITESPACE (); } if (bytes_p) { /* Convert to a power of 2. */ if (align != 0) { unsigned int i; for (i = 0; (align & 1) == 0; align >>= 1, ++i) ; if (align != 1) as_bad (_("alignment not a power of 2")); align = i; } } if (align > align_limit) { align = align_limit; as_warn (_("alignment too large: %u assumed"), align); } if (*input_line_pointer != ',') { fill_p = 0; max = 0; } else { ++input_line_pointer; if (*input_line_pointer == ',') fill_p = 0; else { fill = get_absolute_expression (); SKIP_WHITESPACE (); fill_p = 1; } if (*input_line_pointer != ',') max = 0; else { ++input_line_pointer; max = get_absolute_expression (); } } if (!fill_p) { if (arg < 0) as_warn (_("expected fill pattern missing")); do_align (align, (char *) NULL, 0, max); } else { int fill_len; if (arg >= 0) fill_len = 1; else fill_len = -arg; if (fill_len <= 1) { char fill_char; fill_char = fill; do_align (align, &fill_char, fill_len, max); } else { char ab[16]; if ((size_t) fill_len > sizeof ab) abort (); md_number_to_chars (ab, fill, fill_len); do_align (align, ab, fill_len, max); } } demand_empty_rest_of_line (); if (flag_mri) mri_comment_end (stop, stopc); } /* Handle the .align pseudo-op on machines where ".align 4" means align to a 4 byte boundary. */ void s_align_bytes (int arg) { s_align (arg, 1); } /* Handle the .align pseudo-op on machines where ".align 4" means align to a 2**4 boundary. */ void s_align_ptwo (int arg) { s_align (arg, 0); } /* Switch in and out of alternate macro mode. */ void s_altmacro (int on) { demand_empty_rest_of_line (); macro_set_alternate (on); } symbolS * s_comm_internal (int param, symbolS *(*comm_parse_extra) (int, symbolS *, addressT)) { char *name; char c; char *p; offsetT temp, size; symbolS *symbolP = NULL; char *stop = NULL; char stopc = 0; expressionS exp; if (flag_mri) stop = mri_comment_field (&stopc); name = input_line_pointer; c = get_symbol_end (); /* Just after name is now '\0'. */ p = input_line_pointer; *p = c; if (name == p) { as_bad (_("expected symbol name")); ignore_rest_of_line (); goto out; } SKIP_WHITESPACE (); /* Accept an optional comma after the name. The comma used to be required, but Irix 5 cc does not generate it for .lcomm. */ if (*input_line_pointer == ',') input_line_pointer++; temp = get_absolute_expr (&exp); size = temp; size &= ((offsetT) 2 << (stdoutput->arch_info->bits_per_address - 1)) - 1; if (exp.X_op == O_absent) { as_bad (_("missing size expression")); ignore_rest_of_line (); goto out; } else if (temp != size || !exp.X_unsigned) { as_warn (_("size (%ld) out of range, ignored"), (long) temp); ignore_rest_of_line (); goto out; } *p = 0; symbolP = symbol_find_or_make (name); if ((S_IS_DEFINED (symbolP) || symbol_equated_p (symbolP)) && !S_IS_COMMON (symbolP)) { if (!S_IS_VOLATILE (symbolP)) { symbolP = NULL; as_bad (_("symbol `%s' is already defined"), name); *p = c; ignore_rest_of_line (); goto out; } symbolP = symbol_clone (symbolP, 1); S_SET_SEGMENT (symbolP, undefined_section); S_SET_VALUE (symbolP, 0); symbol_set_frag (symbolP, &zero_address_frag); S_CLEAR_VOLATILE (symbolP); } size = S_GET_VALUE (symbolP); if (size == 0) size = temp; else if (size != temp) as_warn (_("size of \"%s\" is already %ld; not changing to %ld"), name, (long) size, (long) temp); *p = c; if (comm_parse_extra != NULL) symbolP = (*comm_parse_extra) (param, symbolP, size); else { S_SET_VALUE (symbolP, (valueT) size); S_SET_EXTERNAL (symbolP); S_SET_SEGMENT (symbolP, bfd_com_section_ptr); } demand_empty_rest_of_line (); out: if (flag_mri) mri_comment_end (stop, stopc); return symbolP; } void s_comm (int ignore) { s_comm_internal (ignore, NULL); } /* The MRI COMMON pseudo-op. We handle this by creating a common symbol with the appropriate name. We make s_space do the right thing by increasing the size. */ void s_mri_common (int small ATTRIBUTE_UNUSED) { char *name; char c; char *alc = NULL; symbolS *sym; offsetT align; char *stop = NULL; char stopc = 0; if (!flag_mri) { s_comm (0); return; } stop = mri_comment_field (&stopc); SKIP_WHITESPACE (); name = input_line_pointer; if (!ISDIGIT (*name)) c = get_symbol_end (); else { do { ++input_line_pointer; } while (ISDIGIT (*input_line_pointer)); c = *input_line_pointer; *input_line_pointer = '\0'; if (line_label != NULL) { alc = (char *) xmalloc (strlen (S_GET_NAME (line_label)) + (input_line_pointer - name) + 1); sprintf (alc, "%s%s", name, S_GET_NAME (line_label)); name = alc; } } sym = symbol_find_or_make (name); *input_line_pointer = c; if (alc != NULL) free (alc); if (*input_line_pointer != ',') align = 0; else { ++input_line_pointer; align = get_absolute_expression (); } if (S_IS_DEFINED (sym) && !S_IS_COMMON (sym)) { as_bad (_("symbol `%s' is already defined"), S_GET_NAME (sym)); ignore_rest_of_line (); mri_comment_end (stop, stopc); return; } S_SET_EXTERNAL (sym); S_SET_SEGMENT (sym, bfd_com_section_ptr); mri_common_symbol = sym; #ifdef S_SET_ALIGN if (align != 0) S_SET_ALIGN (sym, align); #else (void) align; #endif if (line_label != NULL) { expressionS exp; exp.X_op = O_symbol; exp.X_add_symbol = sym; exp.X_add_number = 0; symbol_set_value_expression (line_label, &exp); symbol_set_frag (line_label, &zero_address_frag); S_SET_SEGMENT (line_label, expr_section); } /* FIXME: We just ignore the small argument, which distinguishes COMMON and COMMON.S. I don't know what we can do about it. */ /* Ignore the type and hptype. */ if (*input_line_pointer == ',') input_line_pointer += 2; if (*input_line_pointer == ',') input_line_pointer += 2; demand_empty_rest_of_line (); mri_comment_end (stop, stopc); } void s_data (int ignore ATTRIBUTE_UNUSED) { segT section; int temp; temp = get_absolute_expression (); if (flag_readonly_data_in_text) { section = text_section; temp += 1000; } else section = data_section; subseg_set (section, (subsegT) temp); demand_empty_rest_of_line (); } /* Handle the .appfile pseudo-op. This is automatically generated by do_scrub_chars when a preprocessor # line comment is seen with a file name. This default definition may be overridden by the object or CPU specific pseudo-ops. This function is also the default definition for .file; the APPFILE argument is 1 for .appfile, 0 for .file. */ void s_app_file_string (char *file, int appfile ATTRIBUTE_UNUSED) { #ifdef LISTING if (listing) listing_source_file (file); #endif register_dependency (file); #ifdef obj_app_file obj_app_file (file, appfile); #endif } void s_app_file (int appfile) { char *s; int length; /* Some assemblers tolerate immediately following '"'. */ if ((s = demand_copy_string (&length)) != 0) { int may_omit = (!new_logical_line_flags (s, -1, 1) && appfile); /* In MRI mode, the preprocessor may have inserted an extraneous backquote. */ if (flag_m68k_mri && *input_line_pointer == '\'' && is_end_of_line[(unsigned char) input_line_pointer[1]]) ++input_line_pointer; demand_empty_rest_of_line (); if (!may_omit) s_app_file_string (s, appfile); } } static int get_linefile_number (int *flag) { SKIP_WHITESPACE (); if (*input_line_pointer < '0' || *input_line_pointer > '9') return 0; *flag = get_absolute_expression (); return 1; } /* Handle the .appline pseudo-op. This is automatically generated by do_scrub_chars when a preprocessor # line comment is seen. This default definition may be overridden by the object or CPU specific pseudo-ops. */ void s_app_line (int appline) { char *file = NULL; int l; /* The given number is that of the next line. */ if (appline) l = get_absolute_expression (); else if (!get_linefile_number (&l)) { ignore_rest_of_line (); return; } l--; if (l < -1) /* Some of the back ends can't deal with non-positive line numbers. Besides, it's silly. GCC however will generate a line number of zero when it is pre-processing builtins for assembler-with-cpp files: # 0 "<built-in>" We do not want to barf on this, especially since such files are used in the GCC and GDB testsuites. So we check for negative line numbers rather than non-positive line numbers. */ as_warn (_("line numbers must be positive; line number %d rejected"), l + 1); else { int flags = 0; int length = 0; if (!appline) { SKIP_WHITESPACE (); if (*input_line_pointer == '"') file = demand_copy_string (&length); if (file) { int this_flag; while (get_linefile_number (&this_flag)) switch (this_flag) { /* From GCC's cpp documentation: 1: start of a new file. 2: returning to a file after having included another file. 3: following text comes from a system header file. 4: following text should be treated as extern "C". 4 is nonsensical for the assembler; 3, we don't care about, so we ignore it just in case a system header file is included while preprocessing assembly. So 1 and 2 are all we care about, and they are mutually incompatible. new_logical_line_flags() demands this. */ case 1: case 2: if (flags && flags != (1 << this_flag)) as_warn (_("incompatible flag %i in line directive"), this_flag); else flags |= 1 << this_flag; break; case 3: case 4: /* We ignore these. */ break; default: as_warn (_("unsupported flag %i in line directive"), this_flag); break; } if (!is_end_of_line[(unsigned char)*input_line_pointer]) file = 0; } } if (appline || file) { new_logical_line_flags (file, l, flags); #ifdef LISTING if (listing) listing_source_line (l); #endif } } if (appline || file) demand_empty_rest_of_line (); else ignore_rest_of_line (); } /* Handle the .end pseudo-op. Actually, the real work is done in read_a_source_file. */ void s_end (int ignore ATTRIBUTE_UNUSED) { if (flag_mri) { /* The MRI assembler permits the start symbol to follow .end, but we don't support that. */ SKIP_WHITESPACE (); if (!is_end_of_line[(unsigned char) *input_line_pointer] && *input_line_pointer != '*' && *input_line_pointer != '!') as_warn (_("start address not supported")); } } /* Handle the .err pseudo-op. */ void s_err (int ignore ATTRIBUTE_UNUSED) { as_bad (_(".err encountered")); demand_empty_rest_of_line (); } /* Handle the .error and .warning pseudo-ops. */ void s_errwarn (int err) { int len; /* The purpose for the conditional assignment is not to internationalize the directive itself, but that we need a self-contained message, one that can be passed like the demand_copy_C_string return value, and with no assumption on the location of the name of the directive within the message. */ char *msg = (err ? _(".error directive invoked in source file") : _(".warning directive invoked in source file")); if (!is_it_end_of_statement ()) { if (*input_line_pointer != '\"') { as_bad (_("%s argument must be a string"), err ? ".error" : ".warning"); ignore_rest_of_line (); return; } msg = demand_copy_C_string (&len); if (msg == NULL) return; } if (err) as_bad ("%s", msg); else as_warn ("%s", msg); demand_empty_rest_of_line (); } /* Handle the MRI fail pseudo-op. */ void s_fail (int ignore ATTRIBUTE_UNUSED) { offsetT temp; char *stop = NULL; char stopc = 0; if (flag_mri) stop = mri_comment_field (&stopc); temp = get_absolute_expression (); if (temp >= 500) as_warn (_(".fail %ld encountered"), (long) temp); else as_bad (_(".fail %ld encountered"), (long) temp); demand_empty_rest_of_line (); if (flag_mri) mri_comment_end (stop, stopc); } void s_fill (int ignore ATTRIBUTE_UNUSED) { expressionS rep_exp; long size = 1; long fill = 0; char *p; #ifdef md_flush_pending_output md_flush_pending_output (); #endif #ifdef md_cons_align md_cons_align (1); #endif get_known_segmented_expression (&rep_exp); if (*input_line_pointer == ',') { input_line_pointer++; size = get_absolute_expression (); if (*input_line_pointer == ',') { input_line_pointer++; fill = get_absolute_expression (); } } /* This is to be compatible with BSD 4.2 AS, not for any rational reason. */ #define BSD_FILL_SIZE_CROCK_8 (8) if (size > BSD_FILL_SIZE_CROCK_8) { as_warn (_(".fill size clamped to %d"), BSD_FILL_SIZE_CROCK_8); size = BSD_FILL_SIZE_CROCK_8; } if (size < 0) { as_warn (_("size negative; .fill ignored")); size = 0; } else if (rep_exp.X_op == O_constant && rep_exp.X_add_number <= 0) { if (rep_exp.X_add_number < 0) as_warn (_("repeat < 0; .fill ignored")); size = 0; } if (size && !need_pass_2) { if (rep_exp.X_op == O_constant) { p = frag_var (rs_fill, (int) size, (int) size, (relax_substateT) 0, (symbolS *) 0, (offsetT) rep_exp.X_add_number, (char *) 0); } else { /* We don't have a constant repeat count, so we can't use rs_fill. We can get the same results out of rs_space, but its argument is in bytes, so we must multiply the repeat count by size. */ symbolS *rep_sym; rep_sym = make_expr_symbol (&rep_exp); if (size != 1) { expressionS size_exp; size_exp.X_op = O_constant; size_exp.X_add_number = size; rep_exp.X_op = O_multiply; rep_exp.X_add_symbol = rep_sym; rep_exp.X_op_symbol = make_expr_symbol (&size_exp); rep_exp.X_add_number = 0; rep_sym = make_expr_symbol (&rep_exp); } p = frag_var (rs_space, (int) size, (int) size, (relax_substateT) 0, rep_sym, (offsetT) 0, (char *) 0); } memset (p, 0, (unsigned int) size); /* The magic number BSD_FILL_SIZE_CROCK_4 is from BSD 4.2 VAX flavoured AS. The following bizarre behaviour is to be compatible with above. I guess they tried to take up to 8 bytes from a 4-byte expression and they forgot to sign extend. */ #define BSD_FILL_SIZE_CROCK_4 (4) md_number_to_chars (p, (valueT) fill, (size > BSD_FILL_SIZE_CROCK_4 ? BSD_FILL_SIZE_CROCK_4 : (int) size)); /* Note: .fill (),0 emits no frag (since we are asked to .fill 0 bytes) but emits no error message because it seems a legal thing to do. It is a degenerate case of .fill but could be emitted by a compiler. */ } demand_empty_rest_of_line (); } void s_globl (int ignore ATTRIBUTE_UNUSED) { char *name; int c; symbolS *symbolP; char *stop = NULL; char stopc = 0; if (flag_mri) stop = mri_comment_field (&stopc); do { name = input_line_pointer; c = get_symbol_end (); symbolP = symbol_find_or_make (name); S_SET_EXTERNAL (symbolP); *input_line_pointer = c; SKIP_WHITESPACE (); c = *input_line_pointer; if (c == ',') { input_line_pointer++; SKIP_WHITESPACE (); if (is_end_of_line[(unsigned char) *input_line_pointer]) c = '\n'; } } while (c == ','); demand_empty_rest_of_line (); if (flag_mri) mri_comment_end (stop, stopc); } #ifdef OBJ_ELF #define skip_whitespace(str) do { if (*(str) == ' ') ++(str); } while (0) static inline int skip_past_char (char ** str, char c) { if (**str == c) { (*str)++; return 0; } else return -1; } #define skip_past_comma(str) skip_past_char (str, ',') /* Parse an attribute directive for VENDOR. Returns the attribute number read, or zero on error. */ int s_vendor_attribute (int vendor) { expressionS exp; int type; int tag; unsigned int i = 0; char *s = NULL; /* Read the first number or name. */ skip_whitespace (input_line_pointer); s = input_line_pointer; if (ISDIGIT (*input_line_pointer)) { expression (& exp); if (exp.X_op != O_constant) goto bad; tag = exp.X_add_number; } else { char *name; /* A name may contain '_', but no other punctuation. */ for (; ISALNUM (*input_line_pointer) || *input_line_pointer == '_'; ++input_line_pointer) i++; if (i == 0) goto bad; name = (char *) alloca (i + 1); memcpy (name, s, i); name[i] = '\0'; #ifndef CONVERT_SYMBOLIC_ATTRIBUTE #define CONVERT_SYMBOLIC_ATTRIBUTE(a) -1 #endif tag = CONVERT_SYMBOLIC_ATTRIBUTE (name); if (tag == -1) { as_bad (_("Attribute name not recognised: %s"), name); ignore_rest_of_line (); return 0; } } type = _bfd_elf_obj_attrs_arg_type (stdoutput, vendor, tag); if (skip_past_comma (&input_line_pointer) == -1) goto bad; if (type & 1) { expression (& exp); if (exp.X_op != O_constant) { as_bad (_("expected numeric constant")); ignore_rest_of_line (); return 0; } i = exp.X_add_number; } if ((type & 3) == 3 && skip_past_comma (&input_line_pointer) == -1) { as_bad (_("expected comma")); ignore_rest_of_line (); return 0; } if (type & 2) { int len; skip_whitespace (input_line_pointer); if (*input_line_pointer != '"') goto bad_string; s = demand_copy_C_string (&len); } switch (type & 3) { case 3: bfd_elf_add_obj_attr_int_string (stdoutput, vendor, tag, i, s); break; case 2: bfd_elf_add_obj_attr_string (stdoutput, vendor, tag, s); break; case 1: bfd_elf_add_obj_attr_int (stdoutput, vendor, tag, i); break; default: abort (); } demand_empty_rest_of_line (); return tag; bad_string: as_bad (_("bad string constant")); ignore_rest_of_line (); return 0; bad: as_bad (_("expected <tag> , <value>")); ignore_rest_of_line (); return 0; } /* Parse a .gnu_attribute directive. */ static void s_gnu_attribute (int ignored ATTRIBUTE_UNUSED) { s_vendor_attribute (OBJ_ATTR_GNU); } #endif /* OBJ_ELF */ /* Handle the MRI IRP and IRPC pseudo-ops. */ void s_irp (int irpc) { char *file, *eol; unsigned int line; sb s; const char *err; sb out; as_where (&file, &line); sb_new (&s); eol = find_end_of_line (input_line_pointer, 0); sb_add_buffer (&s, input_line_pointer, eol - input_line_pointer); input_line_pointer = eol; sb_new (&out); err = expand_irp (irpc, 0, &s, &out, get_non_macro_line_sb); if (err != NULL) as_bad_where (file, line, "%s", err); sb_kill (&s); input_scrub_include_sb (&out, input_line_pointer, 1); sb_kill (&out); buffer_limit = input_scrub_next_buffer (&input_line_pointer); } /* Handle the .linkonce pseudo-op. This tells the assembler to mark the section to only be linked once. However, this is not supported by most object file formats. This takes an optional argument, which is what to do about duplicates. */ void s_linkonce (int ignore ATTRIBUTE_UNUSED) { enum linkonce_type type; SKIP_WHITESPACE (); type = LINKONCE_DISCARD; if (!is_end_of_line[(unsigned char) *input_line_pointer]) { char *s; char c; s = input_line_pointer; c = get_symbol_end (); if (strcasecmp (s, "discard") == 0) type = LINKONCE_DISCARD; else if (strcasecmp (s, "one_only") == 0) type = LINKONCE_ONE_ONLY; else if (strcasecmp (s, "same_size") == 0) type = LINKONCE_SAME_SIZE; else if (strcasecmp (s, "same_contents") == 0) type = LINKONCE_SAME_CONTENTS; else as_warn (_("unrecognized .linkonce type `%s'"), s); *input_line_pointer = c; } #ifdef obj_handle_link_once obj_handle_link_once (type); #else /* ! defined (obj_handle_link_once) */ { flagword flags; if ((bfd_applicable_section_flags (stdoutput) & SEC_LINK_ONCE) == 0) as_warn (_(".linkonce is not supported for this object file format")); flags = bfd_get_section_flags (stdoutput, now_seg); flags |= SEC_LINK_ONCE; switch (type) { default: abort (); case LINKONCE_DISCARD: flags |= SEC_LINK_DUPLICATES_DISCARD; break; case LINKONCE_ONE_ONLY: flags |= SEC_LINK_DUPLICATES_ONE_ONLY; break; case LINKONCE_SAME_SIZE: flags |= SEC_LINK_DUPLICATES_SAME_SIZE; break; case LINKONCE_SAME_CONTENTS: flags |= SEC_LINK_DUPLICATES_SAME_CONTENTS; break; } if (!bfd_set_section_flags (stdoutput, now_seg, flags)) as_bad (_("bfd_set_section_flags: %s"), bfd_errmsg (bfd_get_error ())); } #endif /* ! defined (obj_handle_link_once) */ demand_empty_rest_of_line (); } void bss_alloc (symbolS *symbolP, addressT size, int align) { char *pfrag; segT current_seg = now_seg; subsegT current_subseg = now_subseg; segT bss_seg = bss_section; #if defined (TC_MIPS) || defined (TC_ALPHA) if (OUTPUT_FLAVOR == bfd_target_ecoff_flavour || OUTPUT_FLAVOR == bfd_target_elf_flavour) { /* For MIPS and Alpha ECOFF or ELF, small objects are put in .sbss. */ if (size <= bfd_get_gp_size (stdoutput)) { bss_seg = subseg_new (".sbss", 1); seg_info (bss_seg)->bss = 1; if (!bfd_set_section_flags (stdoutput, bss_seg, SEC_ALLOC)) as_warn (_("error setting flags for \".sbss\": %s"), bfd_errmsg (bfd_get_error ())); } } #endif subseg_set (bss_seg, 1); if (align) { record_alignment (bss_seg, align); frag_align (align, 0, 0); } /* Detach from old frag. */ if (S_GET_SEGMENT (symbolP) == bss_seg) symbol_get_frag (symbolP)->fr_symbol = NULL; symbol_set_frag (symbolP, frag_now); pfrag = frag_var (rs_org, 1, 1, 0, symbolP, size, NULL); *pfrag = 0; #ifdef S_SET_SIZE S_SET_SIZE (symbolP, size); #endif S_SET_SEGMENT (symbolP, bss_seg); #ifdef OBJ_COFF /* The symbol may already have been created with a preceding ".globl" directive -- be careful not to step on storage class in that case. Otherwise, set it to static. */ if (S_GET_STORAGE_CLASS (symbolP) != C_EXT) S_SET_STORAGE_CLASS (symbolP, C_STAT); #endif /* OBJ_COFF */ subseg_set (current_seg, current_subseg); } offsetT parse_align (int align_bytes) { expressionS exp; addressT align; SKIP_WHITESPACE (); if (*input_line_pointer != ',') { no_align: as_bad (_("expected alignment after size")); ignore_rest_of_line (); return -1; } input_line_pointer++; SKIP_WHITESPACE (); align = get_absolute_expr (&exp); if (exp.X_op == O_absent) goto no_align; if (!exp.X_unsigned) { as_warn (_("alignment negative; 0 assumed")); align = 0; } if (align_bytes && align != 0) { /* convert to a power of 2 alignment */ unsigned int alignp2 = 0; while ((align & 1) == 0) align >>= 1, ++alignp2; if (align != 1) { as_bad (_("alignment not a power of 2")); ignore_rest_of_line (); return -1; } align = alignp2; } return align; } /* Called from s_comm_internal after symbol name and size have been parsed. NEEDS_ALIGN is 0 if it was an ".lcomm" (2 args only), 1 if this was a ".bss" directive which has a 3rd argument (alignment as a power of 2), or 2 if this was a ".bss" directive with alignment in bytes. */ symbolS * s_lcomm_internal (int needs_align, symbolS *symbolP, addressT size) { addressT align = 0; if (needs_align) { align = parse_align (needs_align - 1); if (align == (addressT) -1) return NULL; } else /* Assume some objects may require alignment on some systems. */ TC_IMPLICIT_LCOMM_ALIGNMENT (size, align); bss_alloc (symbolP, size, align); return symbolP; } void s_lcomm (int needs_align) { s_comm_internal (needs_align, s_lcomm_internal); } void s_lcomm_bytes (int needs_align) { s_comm_internal (needs_align * 2, s_lcomm_internal); } void s_lsym (int ignore ATTRIBUTE_UNUSED) { char *name; char c; char *p; expressionS exp; symbolS *symbolP; /* We permit ANY defined expression: BSD4.2 demands constants. */ name = input_line_pointer; c = get_symbol_end (); p = input_line_pointer; *p = c; if (name == p) { as_bad (_("expected symbol name")); ignore_rest_of_line (); return; } SKIP_WHITESPACE (); if (*input_line_pointer != ',') { *p = 0; as_bad (_("expected comma after \"%s\""), name); *p = c; ignore_rest_of_line (); return; } input_line_pointer++; expression_and_evaluate (&exp); if (exp.X_op != O_constant && exp.X_op != O_register) { as_bad (_("bad expression")); ignore_rest_of_line (); return; } *p = 0; symbolP = symbol_find_or_make (name); if (S_GET_SEGMENT (symbolP) == undefined_section) { /* The name might be an undefined .global symbol; be sure to keep the "external" bit. */ S_SET_SEGMENT (symbolP, (exp.X_op == O_constant ? absolute_section : reg_section)); S_SET_VALUE (symbolP, (valueT) exp.X_add_number); } else { as_bad (_("symbol `%s' is already defined"), name); } *p = c; demand_empty_rest_of_line (); } /* Read a line into an sb. Returns the character that ended the line or zero if there are no more lines. */ static int get_line_sb (sb *line, int in_macro) { char *eol; if (input_line_pointer[-1] == '\n') bump_line_counters (); if (input_line_pointer >= buffer_limit) { buffer_limit = input_scrub_next_buffer (&input_line_pointer); if (buffer_limit == 0) return 0; } eol = _find_end_of_line (input_line_pointer, flag_m68k_mri, 0, in_macro); sb_add_buffer (line, input_line_pointer, eol - input_line_pointer); input_line_pointer = eol; /* Don't skip multiple end-of-line characters, because that breaks support for the IA-64 stop bit (;;) which looks like two consecutive end-of-line characters but isn't. Instead just skip one end of line character and return the character skipped so that the caller can re-insert it if necessary. */ return *input_line_pointer++; } static int get_non_macro_line_sb (sb *line) { return get_line_sb (line, 0); } static int get_macro_line_sb (sb *line) { return get_line_sb (line, 1); } /* Define a macro. This is an interface to macro.c. */ void s_macro (int ignore ATTRIBUTE_UNUSED) { char *file, *eol; unsigned int line; sb s; const char *err; const char *name; as_where (&file, &line); sb_new (&s); eol = find_end_of_line (input_line_pointer, 0); sb_add_buffer (&s, input_line_pointer, eol - input_line_pointer); input_line_pointer = eol; if (line_label != NULL) { sb label; sb_new (&label); sb_add_string (&label, S_GET_NAME (line_label)); err = define_macro (0, &s, &label, get_macro_line_sb, file, line, &name); sb_kill (&label); } else err = define_macro (0, &s, NULL, get_macro_line_sb, file, line, &name); if (err != NULL) as_bad_where (file, line, err, name); else { if (line_label != NULL) { S_SET_SEGMENT (line_label, absolute_section); S_SET_VALUE (line_label, 0); symbol_set_frag (line_label, &zero_address_frag); } if (((NO_PSEUDO_DOT || flag_m68k_mri) && hash_find (po_hash, name) != NULL) || (!flag_m68k_mri && *name == '.' && hash_find (po_hash, name + 1) != NULL)) as_warn_where (file, line, _("attempt to redefine pseudo-op `%s' ignored"), name); } sb_kill (&s); } /* Handle the .mexit pseudo-op, which immediately exits a macro expansion. */ void s_mexit (int ignore ATTRIBUTE_UNUSED) { if (macro_nest) { cond_exit_macro (macro_nest); buffer_limit = input_scrub_next_buffer (&input_line_pointer); } else as_warn (_("ignoring macro exit outside a macro definition.")); } /* Switch in and out of MRI mode. */ void s_mri (int ignore ATTRIBUTE_UNUSED) { int on; #ifdef MRI_MODE_CHANGE int old_flag; #endif on = get_absolute_expression (); #ifdef MRI_MODE_CHANGE old_flag = flag_mri; #endif if (on != 0) { flag_mri = 1; #ifdef TC_M68K flag_m68k_mri = 1; #endif macro_mri_mode (1); } else { flag_mri = 0; #ifdef TC_M68K flag_m68k_mri = 0; #endif macro_mri_mode (0); } /* Operator precedence changes in m68k MRI mode, so we need to update the operator rankings. */ expr_set_precedence (); #ifdef MRI_MODE_CHANGE if (on != old_flag) MRI_MODE_CHANGE (on); #endif demand_empty_rest_of_line (); } /* Handle changing the location counter. */ static void do_org (segT segment, expressionS *exp, int fill) { if (segment != now_seg && segment != absolute_section && segment != expr_section) as_bad (_("invalid segment \"%s\""), segment_name (segment)); if (now_seg == absolute_section) { if (fill != 0) as_warn (_("ignoring fill value in absolute section")); if (exp->X_op != O_constant) { as_bad (_("only constant offsets supported in absolute section")); exp->X_add_number = 0; } abs_section_offset = exp->X_add_number; } else { char *p; symbolS *sym = exp->X_add_symbol; offsetT off = exp->X_add_number * OCTETS_PER_BYTE; if (exp->X_op != O_constant && exp->X_op != O_symbol) { /* Handle complex expressions. */ sym = make_expr_symbol (exp); off = 0; } p = frag_var (rs_org, 1, 1, (relax_substateT) 0, sym, off, (char *) 0); *p = fill; } } void s_org (int ignore ATTRIBUTE_UNUSED) { segT segment; expressionS exp; long temp_fill; #ifdef md_flush_pending_output md_flush_pending_output (); #endif /* The m68k MRI assembler has a different meaning for .org. It means to create an absolute section at a given address. We can't support that--use a linker script instead. */ if (flag_m68k_mri) { as_bad (_("MRI style ORG pseudo-op not supported")); ignore_rest_of_line (); return; } /* Don't believe the documentation of BSD 4.2 AS. There is no such thing as a sub-segment-relative origin. Any absolute origin is given a warning, then assumed to be segment-relative. Any segmented origin expression ("foo+42") had better be in the right segment or the .org is ignored. BSD 4.2 AS warns if you try to .org backwards. We cannot because we never know sub-segment sizes when we are reading code. BSD will crash trying to emit negative numbers of filler bytes in certain .orgs. We don't crash, but see as-write for that code. Don't make frag if need_pass_2==1. */ segment = get_known_segmented_expression (&exp); if (*input_line_pointer == ',') { input_line_pointer++; temp_fill = get_absolute_expression (); } else temp_fill = 0; if (!need_pass_2) do_org (segment, &exp, temp_fill); demand_empty_rest_of_line (); } /* Handle parsing for the MRI SECT/SECTION pseudo-op. This should be called by the obj-format routine which handles section changing when in MRI mode. It will create a new section, and return it. It will set *TYPE to the section type: one of 'C' (code), 'D' (data), 'M' (mixed), or 'R' (romable). The flags will be set in the section. */ void s_mri_sect (char *type ATTRIBUTE_UNUSED) { #ifdef TC_M68K char *name; char c; segT seg; SKIP_WHITESPACE (); name = input_line_pointer; if (!ISDIGIT (*name)) c = get_symbol_end (); else { do { ++input_line_pointer; } while (ISDIGIT (*input_line_pointer)); c = *input_line_pointer; *input_line_pointer = '\0'; } name = xstrdup (name); *input_line_pointer = c; seg = subseg_new (name, 0); if (*input_line_pointer == ',') { int align; ++input_line_pointer; align = get_absolute_expression (); record_alignment (seg, align); } *type = 'C'; if (*input_line_pointer == ',') { c = *++input_line_pointer; c = TOUPPER (c); if (c == 'C' || c == 'D' || c == 'M' || c == 'R') *type = c; else as_bad (_("unrecognized section type")); ++input_line_pointer; { flagword flags; flags = SEC_NO_FLAGS; if (*type == 'C') flags = SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE; else if (*type == 'D' || *type == 'M') flags = SEC_ALLOC | SEC_LOAD | SEC_DATA; else if (*type == 'R') flags = SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_READONLY | SEC_ROM; if (flags != SEC_NO_FLAGS) { if (!bfd_set_section_flags (stdoutput, seg, flags)) as_warn (_("error setting flags for \"%s\": %s"), bfd_section_name (stdoutput, seg), bfd_errmsg (bfd_get_error ())); } } } /* Ignore the HP type. */ if (*input_line_pointer == ',') input_line_pointer += 2; demand_empty_rest_of_line (); #else /* ! TC_M68K */ #ifdef TC_I960 char *name; char c; segT seg; SKIP_WHITESPACE (); name = input_line_pointer; c = get_symbol_end (); name = xstrdup (name); *input_line_pointer = c; seg = subseg_new (name, 0); if (*input_line_pointer != ',') *type = 'C'; else { char *sectype; ++input_line_pointer; SKIP_WHITESPACE (); sectype = input_line_pointer; c = get_symbol_end (); if (*sectype == '\0') *type = 'C'; else if (strcasecmp (sectype, "text") == 0) *type = 'C'; else if (strcasecmp (sectype, "data") == 0) *type = 'D'; else if (strcasecmp (sectype, "romdata") == 0) *type = 'R'; else as_warn (_("unrecognized section type `%s'"), sectype); *input_line_pointer = c; } if (*input_line_pointer == ',') { char *seccmd; ++input_line_pointer; SKIP_WHITESPACE (); seccmd = input_line_pointer; c = get_symbol_end (); if (strcasecmp (seccmd, "absolute") == 0) { as_bad (_("absolute sections are not supported")); *input_line_pointer = c; ignore_rest_of_line (); return; } else if (strcasecmp (seccmd, "align") == 0) { int align; *input_line_pointer = c; align = get_absolute_expression (); record_alignment (seg, align); } else { as_warn (_("unrecognized section command `%s'"), seccmd); *input_line_pointer = c; } } demand_empty_rest_of_line (); #else /* ! TC_I960 */ /* The MRI assembler seems to use different forms of .sect for different targets. */ as_bad ("MRI mode not supported for this target"); ignore_rest_of_line (); #endif /* ! TC_I960 */ #endif /* ! TC_M68K */ } /* Handle the .print pseudo-op. */ void s_print (int ignore ATTRIBUTE_UNUSED) { char *s; int len; s = demand_copy_C_string (&len); if (s != NULL) printf ("%s\n", s); demand_empty_rest_of_line (); } /* Handle the .purgem pseudo-op. */ void s_purgem (int ignore ATTRIBUTE_UNUSED) { if (is_it_end_of_statement ()) { demand_empty_rest_of_line (); return; } do { char *name; char c; SKIP_WHITESPACE (); name = input_line_pointer; c = get_symbol_end (); delete_macro (name); *input_line_pointer = c; SKIP_WHITESPACE (); } while (*input_line_pointer++ == ','); --input_line_pointer; demand_empty_rest_of_line (); } /* Handle the .endm/.endr pseudo-ops. */ static void s_bad_end (int endr) { as_warn (_(".end%c encountered without preceding %s"), endr ? 'r' : 'm', endr ? ".rept, .irp, or .irpc" : ".macro"); demand_empty_rest_of_line (); } /* Handle the .rept pseudo-op. */ void s_rept (int ignore ATTRIBUTE_UNUSED) { int count; count = get_absolute_expression (); do_repeat (count, "REPT", "ENDR"); } /* This function provides a generic repeat block implementation. It allows different directives to be used as the start/end keys. */ void do_repeat (int count, const char *start, const char *end) { sb one; sb many; sb_new (&one); if (!buffer_and_nest (start, end, &one, get_non_macro_line_sb)) { as_bad (_("%s without %s"), start, end); return; } sb_new (&many); while (count-- > 0) sb_add_sb (&many, &one); sb_kill (&one); input_scrub_include_sb (&many, input_line_pointer, 1); sb_kill (&many); buffer_limit = input_scrub_next_buffer (&input_line_pointer); } /* Like do_repeat except that any text matching EXPANDER in the block is replaced by the itteration count. */ void do_repeat_with_expander (int count, const char * start, const char * end, const char * expander) { sb one; sb many; sb_new (&one); if (!buffer_and_nest (start, end, &one, get_non_macro_line_sb)) { as_bad (_("%s without %s"), start, end); return; } sb_new (&many); if (expander != NULL && strstr (one.ptr, expander) != NULL) { while (count -- > 0) { int len; char * sub; sb processed; sb_new (& processed); sb_add_sb (& processed, & one); sub = strstr (processed.ptr, expander); len = sprintf (sub, "%d", count); gas_assert (len < 8); strcpy (sub + len, sub + 8); processed.len -= (8 - len); sb_add_sb (& many, & processed); sb_kill (& processed); } } else while (count-- > 0) sb_add_sb (&many, &one); sb_kill (&one); input_scrub_include_sb (&many, input_line_pointer, 1); sb_kill (&many); buffer_limit = input_scrub_next_buffer (&input_line_pointer); } /* Skip to end of current repeat loop; EXTRA indicates how many additional input buffers to skip. Assumes that conditionals preceding the loop end are properly nested. This function makes it easier to implement a premature "break" out of the loop. The EXTRA arg accounts for other buffers we might have inserted, such as line substitutions. */ void end_repeat (int extra) { cond_exit_macro (macro_nest); while (extra-- >= 0) buffer_limit = input_scrub_next_buffer (&input_line_pointer); } static void assign_symbol (char *name, int mode) { symbolS *symbolP; if (name[0] == '.' && name[1] == '\0') { /* Turn '. = mumble' into a .org mumble. */ segT segment; expressionS exp; segment = get_known_segmented_expression (&exp); if (!need_pass_2) do_org (segment, &exp, 0); return; } if ((symbolP = symbol_find (name)) == NULL && (symbolP = md_undefined_symbol (name)) == NULL) { symbolP = symbol_find_or_make (name); #ifndef NO_LISTING /* When doing symbol listings, play games with dummy fragments living outside the normal fragment chain to record the file and line info for this symbol. */ if (listing & LISTING_SYMBOLS) { extern struct list_info_struct *listing_tail; fragS *dummy_frag = (fragS *) xcalloc (1, sizeof (fragS)); dummy_frag->line = listing_tail; dummy_frag->fr_symbol = symbolP; symbol_set_frag (symbolP, dummy_frag); } #endif #ifdef OBJ_COFF /* "set" symbols are local unless otherwise specified. */ SF_SET_LOCAL (symbolP); #endif } if (S_IS_DEFINED (symbolP) || symbol_equated_p (symbolP)) { if ((mode != 0 || !S_IS_VOLATILE (symbolP)) && !S_CAN_BE_REDEFINED (symbolP)) { as_bad (_("symbol `%s' is already defined"), name); symbolP = symbol_clone (symbolP, 0); } /* If the symbol is volatile, copy the symbol and replace the original with the copy, so that previous uses of the symbol will retain the value of the symbol at the point of use. */ else if (S_IS_VOLATILE (symbolP)) symbolP = symbol_clone (symbolP, 1); } if (mode == 0) S_SET_VOLATILE (symbolP); else if (mode < 0) S_SET_FORWARD_REF (symbolP); pseudo_set (symbolP); } /* Handle the .equ, .equiv, .eqv, and .set directives. If EQUIV is 1, then this is .equiv, and it is an error if the symbol is already defined. If EQUIV is -1, the symbol additionally is a forward reference. */ void s_set (int equiv) { char *name; char delim; char *end_name; /* Especial apologies for the random logic: this just grew, and could be parsed much more simply! Dean in haste. */ name = input_line_pointer; delim = get_symbol_end (); end_name = input_line_pointer; *end_name = delim; if (name == end_name) { as_bad (_("expected symbol name")); ignore_rest_of_line (); return; } SKIP_WHITESPACE (); if (*input_line_pointer != ',') { *end_name = 0; as_bad (_("expected comma after \"%s\""), name); *end_name = delim; ignore_rest_of_line (); return; } input_line_pointer++; *end_name = 0; assign_symbol (name, equiv); *end_name = delim; demand_empty_rest_of_line (); } void s_space (int mult) { expressionS exp; expressionS val; char *p = 0; char *stop = NULL; char stopc = 0; int bytes; #ifdef md_flush_pending_output md_flush_pending_output (); #endif #ifdef md_cons_align md_cons_align (1); #endif if (flag_mri) stop = mri_comment_field (&stopc); /* In m68k MRI mode, we need to align to a word boundary, unless this is ds.b. */ if (flag_m68k_mri && mult > 1) { if (now_seg == absolute_section) { abs_section_offset += abs_section_offset & 1; if (line_label != NULL) S_SET_VALUE (line_label, abs_section_offset); } else if (mri_common_symbol != NULL) { valueT mri_val; mri_val = S_GET_VALUE (mri_common_symbol); if ((mri_val & 1) != 0) { S_SET_VALUE (mri_common_symbol, mri_val + 1); if (line_label != NULL) { expressionS *symexp; symexp = symbol_get_value_expression (line_label); know (symexp->X_op == O_symbol); know (symexp->X_add_symbol == mri_common_symbol); symexp->X_add_number += 1; } } } else { do_align (1, (char *) NULL, 0, 0); if (line_label != NULL) { symbol_set_frag (line_label, frag_now); S_SET_VALUE (line_label, frag_now_fix ()); } } } bytes = mult; expression (&exp); SKIP_WHITESPACE (); if (*input_line_pointer == ',') { ++input_line_pointer; expression (&val); } else { val.X_op = O_constant; val.X_add_number = 0; } if (val.X_op != O_constant || val.X_add_number < - 0x80 || val.X_add_number > 0xff || (mult != 0 && mult != 1 && val.X_add_number != 0)) { resolve_expression (&exp); if (exp.X_op != O_constant) as_bad (_("unsupported variable size or fill value")); else { offsetT i; if (mult == 0) mult = 1; bytes = mult * exp.X_add_number; for (i = 0; i < exp.X_add_number; i++) emit_expr (&val, mult); } } else { if (now_seg == absolute_section || mri_common_symbol != NULL) resolve_expression (&exp); if (exp.X_op == O_constant) { offsetT repeat; repeat = exp.X_add_number; if (mult) repeat *= mult; bytes = repeat; if (repeat <= 0) { if (!flag_mri) as_warn (_(".space repeat count is zero, ignored")); else if (repeat < 0) as_warn (_(".space repeat count is negative, ignored")); goto getout; } /* If we are in the absolute section, just bump the offset. */ if (now_seg == absolute_section) { abs_section_offset += repeat; goto getout; } /* If we are secretly in an MRI common section, then creating space just increases the size of the common symbol. */ if (mri_common_symbol != NULL) { S_SET_VALUE (mri_common_symbol, S_GET_VALUE (mri_common_symbol) + repeat); goto getout; } if (!need_pass_2) p = frag_var (rs_fill, 1, 1, (relax_substateT) 0, (symbolS *) 0, (offsetT) repeat, (char *) 0); } else { if (now_seg == absolute_section) { as_bad (_("space allocation too complex in absolute section")); subseg_set (text_section, 0); } if (mri_common_symbol != NULL) { as_bad (_("space allocation too complex in common section")); mri_common_symbol = NULL; } if (!need_pass_2) p = frag_var (rs_space, 1, 1, (relax_substateT) 0, make_expr_symbol (&exp), (offsetT) 0, (char *) 0); } if (p) *p = val.X_add_number; } getout: /* In MRI mode, after an odd number of bytes, we must align to an even word boundary, unless the next instruction is a dc.b, ds.b or dcb.b. */ if (flag_mri && (bytes & 1) != 0) mri_pending_align = 1; demand_empty_rest_of_line (); if (flag_mri) mri_comment_end (stop, stopc); } /* This is like s_space, but the value is a floating point number with the given precision. This is for the MRI dcb.s pseudo-op and friends. */ void s_float_space (int float_type) { offsetT count; int flen; char temp[MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT]; char *stop = NULL; char stopc = 0; #ifdef md_cons_align md_cons_align (1); #endif if (flag_mri) stop = mri_comment_field (&stopc); count = get_absolute_expression (); SKIP_WHITESPACE (); if (*input_line_pointer != ',') { as_bad (_("missing value")); ignore_rest_of_line (); if (flag_mri) mri_comment_end (stop, stopc); return; } ++input_line_pointer; SKIP_WHITESPACE (); /* Skip any 0{letter} that may be present. Don't even check if the * letter is legal. */ if (input_line_pointer[0] == '0' && ISALPHA (input_line_pointer[1])) input_line_pointer += 2; /* Accept :xxxx, where the x's are hex digits, for a floating point with the exact digits specified. */ if (input_line_pointer[0] == ':') { flen = hex_float (float_type, temp); if (flen < 0) { ignore_rest_of_line (); if (flag_mri) mri_comment_end (stop, stopc); return; } } else { char *err; err = md_atof (float_type, temp, &flen); know (flen <= MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT); know (err != NULL || flen > 0); if (err) { as_bad (_("bad floating literal: %s"), err); ignore_rest_of_line (); if (flag_mri) mri_comment_end (stop, stopc); return; } } while (--count >= 0) { char *p; p = frag_more (flen); memcpy (p, temp, (unsigned int) flen); } demand_empty_rest_of_line (); if (flag_mri) mri_comment_end (stop, stopc); } /* Handle the .struct pseudo-op, as found in MIPS assemblers. */ void s_struct (int ignore ATTRIBUTE_UNUSED) { char *stop = NULL; char stopc = 0; if (flag_mri) stop = mri_comment_field (&stopc); abs_section_offset = get_absolute_expression (); #if defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF) /* The ELF backend needs to know that we are changing sections, so that .previous works correctly. */ if (IS_ELF) obj_elf_section_change_hook (); #endif subseg_set (absolute_section, 0); demand_empty_rest_of_line (); if (flag_mri) mri_comment_end (stop, stopc); } void s_text (int ignore ATTRIBUTE_UNUSED) { int temp; temp = get_absolute_expression (); subseg_set (text_section, (subsegT) temp); demand_empty_rest_of_line (); } /* .weakref x, y sets x as an alias to y that, as long as y is not referenced directly, will cause y to become a weak symbol. */ void s_weakref (int ignore ATTRIBUTE_UNUSED) { char *name; char delim; char *end_name; symbolS *symbolP; symbolS *symbolP2; expressionS exp; name = input_line_pointer; delim = get_symbol_end (); end_name = input_line_pointer; if (name == end_name) { as_bad (_("expected symbol name")); *end_name = delim; ignore_rest_of_line (); return; } symbolP = symbol_find_or_make (name); if (S_IS_DEFINED (symbolP) || symbol_equated_p (symbolP)) { if (!S_IS_VOLATILE (symbolP)) { as_bad (_("symbol `%s' is already defined"), name); *end_name = delim; ignore_rest_of_line (); return; } symbolP = symbol_clone (symbolP, 1); S_CLEAR_VOLATILE (symbolP); } *end_name = delim; SKIP_WHITESPACE (); if (*input_line_pointer != ',') { *end_name = 0; as_bad (_("expected comma after \"%s\""), name); *end_name = delim; ignore_rest_of_line (); return; } input_line_pointer++; SKIP_WHITESPACE (); name = input_line_pointer; delim = get_symbol_end (); end_name = input_line_pointer; if (name == end_name) { as_bad (_("expected symbol name")); ignore_rest_of_line (); return; } if ((symbolP2 = symbol_find_noref (name, 1)) == NULL && (symbolP2 = md_undefined_symbol (name)) == NULL) { symbolP2 = symbol_find_or_make (name); S_SET_WEAKREFD (symbolP2); } else { symbolS *symp = symbolP2; while (S_IS_WEAKREFR (symp) && symp != symbolP) { expressionS *expP = symbol_get_value_expression (symp); gas_assert (expP->X_op == O_symbol && expP->X_add_number == 0); symp = expP->X_add_symbol; } if (symp == symbolP) { char *loop; loop = concat (S_GET_NAME (symbolP), " => ", S_GET_NAME (symbolP2), (const char *) NULL); symp = symbolP2; while (symp != symbolP) { char *old_loop = loop; symp = symbol_get_value_expression (symp)->X_add_symbol; loop = concat (loop, " => ", S_GET_NAME (symp), (const char *) NULL); free (old_loop); } as_bad (_("%s: would close weakref loop: %s"), S_GET_NAME (symbolP), loop); free (loop); *end_name = delim; ignore_rest_of_line (); return; } /* Short-circuiting instead of just checking here might speed things up a tiny little bit, but loop error messages would miss intermediate links. */ /* symbolP2 = symp; */ } *end_name = delim; memset (&exp, 0, sizeof (exp)); exp.X_op = O_symbol; exp.X_add_symbol = symbolP2; S_SET_SEGMENT (symbolP, undefined_section); symbol_set_value_expression (symbolP, &exp); symbol_set_frag (symbolP, &zero_address_frag); S_SET_WEAKREFR (symbolP); demand_empty_rest_of_line (); } /* Verify that we are at the end of a line. If not, issue an error and skip to EOL. */ void demand_empty_rest_of_line (void) { SKIP_WHITESPACE (); if (is_end_of_line[(unsigned char) *input_line_pointer]) input_line_pointer++; else { if (ISPRINT (*input_line_pointer)) as_bad (_("junk at end of line, first unrecognized character is `%c'"), *input_line_pointer); else as_bad (_("junk at end of line, first unrecognized character valued 0x%x"), *input_line_pointer); ignore_rest_of_line (); } /* Return pointing just after end-of-line. */ know (is_end_of_line[(unsigned char) input_line_pointer[-1]]); } /* Silently advance to the end of line. Use this after already having issued an error about something bad. */ void ignore_rest_of_line (void) { while (input_line_pointer < buffer_limit && !is_end_of_line[(unsigned char) *input_line_pointer]) input_line_pointer++; input_line_pointer++; /* Return pointing just after end-of-line. */ know (is_end_of_line[(unsigned char) input_line_pointer[-1]]); } /* Sets frag for given symbol to zero_address_frag, except when the symbol frag is already set to a dummy listing frag. */ static void set_zero_frag (symbolS *symbolP) { if (symbol_get_frag (symbolP)->fr_type != rs_dummy) symbol_set_frag (symbolP, &zero_address_frag); } /* In: Pointer to a symbol. Input_line_pointer->expression. Out: Input_line_pointer->just after any whitespace after expression. Tried to set symbol to value of expression. Will change symbols type, value, and frag; */ void pseudo_set (symbolS *symbolP) { expressionS exp; segT seg; know (symbolP); /* NULL pointer is logic error. */ if (!S_IS_FORWARD_REF (symbolP)) (void) expression (&exp); else (void) deferred_expression (&exp); if (exp.X_op == O_illegal) as_bad (_("illegal expression")); else if (exp.X_op == O_absent) as_bad (_("missing expression")); else if (exp.X_op == O_big) { if (exp.X_add_number > 0) as_bad (_("bignum invalid")); else as_bad (_("floating point number invalid")); } else if (exp.X_op == O_subtract && !S_IS_FORWARD_REF (symbolP) && SEG_NORMAL (S_GET_SEGMENT (exp.X_add_symbol)) && (symbol_get_frag (exp.X_add_symbol) == symbol_get_frag (exp.X_op_symbol))) { exp.X_op = O_constant; exp.X_add_number = (S_GET_VALUE (exp.X_add_symbol) - S_GET_VALUE (exp.X_op_symbol)); } if (symbol_section_p (symbolP)) { as_bad ("attempt to set value of section symbol"); return; } switch (exp.X_op) { case O_illegal: case O_absent: case O_big: exp.X_add_number = 0; /* Fall through. */ case O_constant: S_SET_SEGMENT (symbolP, absolute_section); S_SET_VALUE (symbolP, (valueT) exp.X_add_number); set_zero_frag (symbolP); break; case O_register: #ifndef TC_GLOBAL_REGISTER_SYMBOL_OK if (S_IS_EXTERNAL (symbolP)) { as_bad ("can't equate global symbol `%s' with register name", S_GET_NAME (symbolP)); return; } #endif S_SET_SEGMENT (symbolP, reg_section); S_SET_VALUE (symbolP, (valueT) exp.X_add_number); set_zero_frag (symbolP); symbol_get_value_expression (symbolP)->X_op = O_register; break; case O_symbol: seg = S_GET_SEGMENT (exp.X_add_symbol); /* For x=undef+const, create an expression symbol. For x=x+const, just update x except when x is an undefined symbol For x=defined+const, evaluate x. */ if (symbolP == exp.X_add_symbol && (seg != undefined_section || !symbol_constant_p (symbolP))) { *symbol_X_add_number (symbolP) += exp.X_add_number; break; } else if (!S_IS_FORWARD_REF (symbolP) && seg != undefined_section) { symbolS *s = exp.X_add_symbol; if (S_IS_COMMON (s)) as_bad (_("`%s' can't be equated to common symbol '%s'"), S_GET_NAME (symbolP), S_GET_NAME (s)); S_SET_SEGMENT (symbolP, seg); S_SET_VALUE (symbolP, exp.X_add_number + S_GET_VALUE (s)); symbol_set_frag (symbolP, symbol_get_frag (s)); copy_symbol_attributes (symbolP, s); break; } S_SET_SEGMENT (symbolP, undefined_section); symbol_set_value_expression (symbolP, &exp); copy_symbol_attributes (symbolP, exp.X_add_symbol); set_zero_frag (symbolP); break; default: /* The value is some complex expression. */ S_SET_SEGMENT (symbolP, expr_section); symbol_set_value_expression (symbolP, &exp); set_zero_frag (symbolP); break; } } /* cons() CONStruct more frag of .bytes, or .words etc. Should need_pass_2 be 1 then emit no frag(s). This understands EXPRESSIONS. Bug (?) This has a split personality. We use expression() to read the value. We can detect if the value won't fit in a byte or word. But we can't detect if expression() discarded significant digits in the case of a long. Not worth the crocks required to fix it. */ /* Select a parser for cons expressions. */ /* Some targets need to parse the expression in various fancy ways. You can define TC_PARSE_CONS_EXPRESSION to do whatever you like (for example, the HPPA does this). Otherwise, you can define BITFIELD_CONS_EXPRESSIONS to permit bitfields to be specified, or REPEAT_CONS_EXPRESSIONS to permit repeat counts. If none of these are defined, which is the normal case, then only simple expressions are permitted. */ #ifdef TC_M68K static void parse_mri_cons (expressionS *exp, unsigned int nbytes); #endif #ifndef TC_PARSE_CONS_EXPRESSION #ifdef BITFIELD_CONS_EXPRESSIONS #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_bitfield_cons (EXP, NBYTES) static void parse_bitfield_cons (expressionS *exp, unsigned int nbytes); #endif #ifdef REPEAT_CONS_EXPRESSIONS #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_repeat_cons (EXP, NBYTES) static void parse_repeat_cons (expressionS *exp, unsigned int nbytes); #endif /* If we haven't gotten one yet, just call expression. */ #ifndef TC_PARSE_CONS_EXPRESSION #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) expression (EXP) #endif #endif void do_parse_cons_expression (expressionS *exp, int nbytes ATTRIBUTE_UNUSED) { TC_PARSE_CONS_EXPRESSION (exp, nbytes); } /* Worker to do .byte etc statements. Clobbers input_line_pointer and checks end-of-line. */ static void cons_worker (int nbytes, /* 1=.byte, 2=.word, 4=.long. */ int rva) { int c; expressionS exp; char *stop = NULL; char stopc = 0; #ifdef md_flush_pending_output md_flush_pending_output (); #endif if (flag_mri) stop = mri_comment_field (&stopc); if (is_it_end_of_statement ()) { demand_empty_rest_of_line (); if (flag_mri) mri_comment_end (stop, stopc); return; } #ifdef TC_ADDRESS_BYTES if (nbytes == 0) nbytes = TC_ADDRESS_BYTES (); #endif #ifdef md_cons_align md_cons_align (nbytes); #endif c = 0; do { #ifdef TC_M68K if (flag_m68k_mri) parse_mri_cons (&exp, (unsigned int) nbytes); else #endif { if (*input_line_pointer == '"') { as_bad (_("unexpected `\"' in expression")); ignore_rest_of_line (); return; } TC_PARSE_CONS_EXPRESSION (&exp, (unsigned int) nbytes); } if (rva) { if (exp.X_op == O_symbol) exp.X_op = O_symbol_rva; else as_fatal (_("rva without symbol")); } emit_expr (&exp, (unsigned int) nbytes); ++c; } while (*input_line_pointer++ == ','); /* In MRI mode, after an odd number of bytes, we must align to an even word boundary, unless the next instruction is a dc.b, ds.b or dcb.b. */ if (flag_mri && nbytes == 1 && (c & 1) != 0) mri_pending_align = 1; input_line_pointer--; /* Put terminator back into stream. */ demand_empty_rest_of_line (); if (flag_mri) mri_comment_end (stop, stopc); } void cons (int size) { cons_worker (size, 0); } void s_rva (int size) { cons_worker (size, 1); } /* .reloc offset, reloc_name, symbol+addend. */ void s_reloc (int ignore ATTRIBUTE_UNUSED) { char *stop = NULL; char stopc = 0; expressionS exp; char *r_name; int c; struct reloc_list *reloc; reloc = (struct reloc_list *) xmalloc (sizeof (*reloc)); if (flag_mri) stop = mri_comment_field (&stopc); expression (&exp); switch (exp.X_op) { case O_illegal: case O_absent: case O_big: case O_register: as_bad (_("missing or bad offset expression")); goto err_out; case O_constant: exp.X_add_symbol = section_symbol (now_seg); exp.X_op = O_symbol; /* Fall thru */ case O_symbol: if (exp.X_add_number == 0) { reloc->u.a.offset_sym = exp.X_add_symbol; break; } /* Fall thru */ default: reloc->u.a.offset_sym = make_expr_symbol (&exp); break; } SKIP_WHITESPACE (); if (*input_line_pointer != ',') { as_bad (_("missing reloc type")); goto err_out; } ++input_line_pointer; SKIP_WHITESPACE (); r_name = input_line_pointer; c = get_symbol_end (); reloc->u.a.howto = bfd_reloc_name_lookup (stdoutput, r_name); *input_line_pointer = c; if (reloc->u.a.howto == NULL) { as_bad (_("unrecognized reloc type")); goto err_out; } exp.X_op = O_absent; SKIP_WHITESPACE (); if (*input_line_pointer == ',') { ++input_line_pointer; expression (&exp); } switch (exp.X_op) { case O_illegal: case O_big: case O_register: as_bad (_("bad reloc expression")); err_out: ignore_rest_of_line (); free (reloc); if (flag_mri) mri_comment_end (stop, stopc); return; case O_absent: reloc->u.a.sym = NULL; reloc->u.a.addend = 0; break; case O_constant: reloc->u.a.sym = NULL; reloc->u.a.addend = exp.X_add_number; break; case O_symbol: reloc->u.a.sym = exp.X_add_symbol; reloc->u.a.addend = exp.X_add_number; break; default: reloc->u.a.sym = make_expr_symbol (&exp); reloc->u.a.addend = 0; break; } as_where (&reloc->file, &reloc->line); reloc->next = reloc_list; reloc_list = reloc; demand_empty_rest_of_line (); if (flag_mri) mri_comment_end (stop, stopc); } /* Put the contents of expression EXP into the object file using NBYTES bytes. If need_pass_2 is 1, this does nothing. */ void emit_expr (expressionS *exp, unsigned int nbytes) { operatorT op; char *p; valueT extra_digit = 0; /* Don't do anything if we are going to make another pass. */ if (need_pass_2) return; /* Grow the current frag now so that dot_value does not get invalidated if the frag were to fill up in the frag_more() call below. */ frag_grow (nbytes); dot_value = frag_now_fix (); #ifndef NO_LISTING #ifdef OBJ_ELF /* When gcc emits DWARF 1 debugging pseudo-ops, a line number will appear as a four byte positive constant in the .line section, followed by a 2 byte 0xffff. Look for that case here. */ { static int dwarf_line = -1; if (strcmp (segment_name (now_seg), ".line") != 0) dwarf_line = -1; else if (dwarf_line >= 0 && nbytes == 2 && exp->X_op == O_constant && (exp->X_add_number == -1 || exp->X_add_number == 0xffff)) listing_source_line ((unsigned int) dwarf_line); else if (nbytes == 4 && exp->X_op == O_constant && exp->X_add_number >= 0) dwarf_line = exp->X_add_number; else dwarf_line = -1; } /* When gcc emits DWARF 1 debugging pseudo-ops, a file name will appear as a 2 byte TAG_compile_unit (0x11) followed by a 2 byte AT_sibling (0x12) followed by a four byte address of the sibling followed by a 2 byte AT_name (0x38) followed by the name of the file. We look for that case here. */ { static int dwarf_file = 0; if (strcmp (segment_name (now_seg), ".debug") != 0) dwarf_file = 0; else if (dwarf_file == 0 && nbytes == 2 && exp->X_op == O_constant && exp->X_add_number == 0x11) dwarf_file = 1; else if (dwarf_file == 1 && nbytes == 2 && exp->X_op == O_constant && exp->X_add_number == 0x12) dwarf_file = 2; else if (dwarf_file == 2 && nbytes == 4) dwarf_file = 3; else if (dwarf_file == 3 && nbytes == 2 && exp->X_op == O_constant && exp->X_add_number == 0x38) dwarf_file = 4; else dwarf_file = 0; /* The variable dwarf_file_string tells stringer that the string may be the name of the source file. */ if (dwarf_file == 4) dwarf_file_string = 1; else dwarf_file_string = 0; } #endif #endif if (check_eh_frame (exp, &nbytes)) return; op = exp->X_op; /* Allow `.word 0' in the absolute section. */ if (now_seg == absolute_section) { if (op != O_constant || exp->X_add_number != 0) as_bad (_("attempt to store value in absolute section")); abs_section_offset += nbytes; return; } /* Handle a negative bignum. */ if (op == O_uminus && exp->X_add_number == 0 && symbol_get_value_expression (exp->X_add_symbol)->X_op == O_big && symbol_get_value_expression (exp->X_add_symbol)->X_add_number > 0) { int i; unsigned long carry; exp = symbol_get_value_expression (exp->X_add_symbol); /* Negate the bignum: one's complement each digit and add 1. */ carry = 1; for (i = 0; i < exp->X_add_number; i++) { unsigned long next; next = (((~(generic_bignum[i] & LITTLENUM_MASK)) & LITTLENUM_MASK) + carry); generic_bignum[i] = next & LITTLENUM_MASK; carry = next >> LITTLENUM_NUMBER_OF_BITS; } /* We can ignore any carry out, because it will be handled by extra_digit if it is needed. */ extra_digit = (valueT) -1; op = O_big; } if (op == O_absent || op == O_illegal) { as_warn (_("zero assumed for missing expression")); exp->X_add_number = 0; op = O_constant; } else if (op == O_big && exp->X_add_number <= 0) { as_bad (_("floating point number invalid")); exp->X_add_number = 0; op = O_constant; } else if (op == O_register) { as_warn (_("register value used as expression")); op = O_constant; } p = frag_more ((int) nbytes); #ifndef WORKING_DOT_WORD /* If we have the difference of two symbols in a word, save it on the broken_words list. See the code in write.c. */ if (op == O_subtract && nbytes == 2) { struct broken_word *x; x = (struct broken_word *) xmalloc (sizeof (struct broken_word)); x->next_broken_word = broken_words; broken_words = x; x->seg = now_seg; x->subseg = now_subseg; x->frag = frag_now; x->word_goes_here = p; x->dispfrag = 0; x->add = exp->X_add_symbol; x->sub = exp->X_op_symbol; x->addnum = exp->X_add_number; x->added = 0; x->use_jump = 0; new_broken_words++; return; } #endif /* If we have an integer, but the number of bytes is too large to pass to md_number_to_chars, handle it as a bignum. */ if (op == O_constant && nbytes > sizeof (valueT)) { extra_digit = exp->X_unsigned ? 0 : -1; convert_to_bignum (exp); op = O_big; } if (op == O_constant) { valueT get; valueT use; valueT mask; valueT hibit; valueT unmask; /* JF << of >= number of bits in the object is undefined. In particular SPARC (Sun 4) has problems. */ if (nbytes >= sizeof (valueT)) { mask = 0; if (nbytes > sizeof (valueT)) hibit = 0; else hibit = (valueT) 1 << (nbytes * BITS_PER_CHAR - 1); } else { /* Don't store these bits. */ mask = ~(valueT) 0 << (BITS_PER_CHAR * nbytes); hibit = (valueT) 1 << (nbytes * BITS_PER_CHAR - 1); } unmask = ~mask; /* Do store these bits. */ #ifdef NEVER "Do this mod if you want every overflow check to assume SIGNED 2's complement data."; mask = ~(unmask >> 1); /* Includes sign bit now. */ #endif get = exp->X_add_number; use = get & unmask; if ((get & mask) != 0 && ((get & mask) != mask || (get & hibit) == 0)) { /* Leading bits contain both 0s & 1s. */ #if defined (BFD64) && BFD_HOST_64BIT_LONG_LONG #ifndef __MSVCRT__ as_warn (_("value 0x%llx truncated to 0x%llx"), (unsigned long long) get, (unsigned long long) use); #else as_warn (_("value 0x%I64x truncated to 0x%I64x"), (unsigned long long) get, (unsigned long long) use); #endif #else as_warn (_("value 0x%lx truncated to 0x%lx"), (unsigned long) get, (unsigned long) use); #endif } /* Put bytes in right order. */ md_number_to_chars (p, use, (int) nbytes); } else if (op == O_big) { unsigned int size; LITTLENUM_TYPE *nums; size = exp->X_add_number * CHARS_PER_LITTLENUM; if (nbytes < size) { int i = nbytes / CHARS_PER_LITTLENUM; if (i != 0) { LITTLENUM_TYPE sign = 0; if ((generic_bignum[--i] & (1 << (LITTLENUM_NUMBER_OF_BITS - 1))) != 0) sign = ~(LITTLENUM_TYPE) 0; while (++i < exp->X_add_number) if (generic_bignum[i] != sign) break; } if (i < exp->X_add_number) as_warn (_("bignum truncated to %d bytes"), nbytes); size = nbytes; } if (nbytes == 1) { md_number_to_chars (p, (valueT) generic_bignum[0], 1); return; } know (nbytes % CHARS_PER_LITTLENUM == 0); if (target_big_endian) { while (nbytes > size) { md_number_to_chars (p, extra_digit, CHARS_PER_LITTLENUM); nbytes -= CHARS_PER_LITTLENUM; p += CHARS_PER_LITTLENUM; } nums = generic_bignum + size / CHARS_PER_LITTLENUM; while (size >= CHARS_PER_LITTLENUM) { --nums; md_number_to_chars (p, (valueT) *nums, CHARS_PER_LITTLENUM); size -= CHARS_PER_LITTLENUM; p += CHARS_PER_LITTLENUM; } } else { nums = generic_bignum; while (size >= CHARS_PER_LITTLENUM) { md_number_to_chars (p, (valueT) *nums, CHARS_PER_LITTLENUM); ++nums; size -= CHARS_PER_LITTLENUM; p += CHARS_PER_LITTLENUM; nbytes -= CHARS_PER_LITTLENUM; } while (nbytes >= CHARS_PER_LITTLENUM) { md_number_to_chars (p, extra_digit, CHARS_PER_LITTLENUM); nbytes -= CHARS_PER_LITTLENUM; p += CHARS_PER_LITTLENUM; } } } else emit_expr_fix (exp, nbytes, frag_now, p); } void emit_expr_fix (expressionS *exp, unsigned int nbytes, fragS *frag, char *p) { memset (p, 0, nbytes); /* Generate a fixS to record the symbol value. */ #ifdef TC_CONS_FIX_NEW TC_CONS_FIX_NEW (frag, p - frag->fr_literal, nbytes, exp); #else { bfd_reloc_code_real_type r; switch (nbytes) { case 1: r = BFD_RELOC_8; break; case 2: r = BFD_RELOC_16; break; case 3: r = BFD_RELOC_24; break; case 4: r = BFD_RELOC_32; break; case 8: r = BFD_RELOC_64; break; default: as_bad (_("unsupported BFD relocation size %u"), nbytes); r = BFD_RELOC_32; break; } fix_new_exp (frag, p - frag->fr_literal, (int) nbytes, exp, 0, r); } #endif } #ifdef BITFIELD_CONS_EXPRESSIONS /* i960 assemblers, (eg, asm960), allow bitfields after ".byte" as w:x,y:z, where w and y are bitwidths and x and y are values. They then pack them all together. We do a little better in that we allow them in words, longs, etc. and we'll pack them in target byte order for you. The rules are: pack least significant bit first, if a field doesn't entirely fit, put it in the next unit. Overflowing the bitfield is explicitly *not* even a warning. The bitwidth should be considered a "mask". To use this function the tc-XXX.h file should define BITFIELD_CONS_EXPRESSIONS. */ static void parse_bitfield_cons (exp, nbytes) expressionS *exp; unsigned int nbytes; { unsigned int bits_available = BITS_PER_CHAR * nbytes; char *hold = input_line_pointer; (void) expression (exp); if (*input_line_pointer == ':') { /* Bitfields. */ long value = 0; for (;;) { unsigned long width; if (*input_line_pointer != ':') { input_line_pointer = hold; break; } /* Next piece is not a bitfield. */ /* In the general case, we can't allow full expressions with symbol differences and such. The relocation entries for symbols not defined in this assembly would require arbitrary field widths, positions, and masks which most of our current object formats don't support. In the specific case where a symbol *is* defined in this assembly, we *could* build fixups and track it, but this could lead to confusion for the backends. I'm lazy. I'll take any SEG_ABSOLUTE. I think that means that you can use a previous .set or .equ type symbol. xoxorich. */ if (exp->X_op == O_absent) { as_warn (_("using a bit field width of zero")); exp->X_add_number = 0; exp->X_op = O_constant; } /* Implied zero width bitfield. */ if (exp->X_op != O_constant) { *input_line_pointer = '\0'; as_bad (_("field width \"%s\" too complex for a bitfield"), hold); *input_line_pointer = ':'; demand_empty_rest_of_line (); return; } /* Too complex. */ if ((width = exp->X_add_number) > (BITS_PER_CHAR * nbytes)) { as_warn (_("field width %lu too big to fit in %d bytes: truncated to %d bits"), width, nbytes, (BITS_PER_CHAR * nbytes)); width = BITS_PER_CHAR * nbytes; } /* Too big. */ if (width > bits_available) { /* FIXME-SOMEDAY: backing up and reparsing is wasteful. */ input_line_pointer = hold; exp->X_add_number = value; break; } /* Won't fit. */ /* Skip ':'. */ hold = ++input_line_pointer; (void) expression (exp); if (exp->X_op != O_constant) { char cache = *input_line_pointer; *input_line_pointer = '\0'; as_bad (_("field value \"%s\" too complex for a bitfield"), hold); *input_line_pointer = cache; demand_empty_rest_of_line (); return; } /* Too complex. */ value |= ((~(-1 << width) & exp->X_add_number) << ((BITS_PER_CHAR * nbytes) - bits_available)); if ((bits_available -= width) == 0 || is_it_end_of_statement () || *input_line_pointer != ',') { break; } /* All the bitfields we're gonna get. */ hold = ++input_line_pointer; (void) expression (exp); } exp->X_add_number = value; exp->X_op = O_constant; exp->X_unsigned = 1; } } #endif /* BITFIELD_CONS_EXPRESSIONS */ /* Handle an MRI style string expression. */ #ifdef TC_M68K static void parse_mri_cons (exp, nbytes) expressionS *exp; unsigned int nbytes; { if (*input_line_pointer != '\'' && (input_line_pointer[1] != '\'' || (*input_line_pointer != 'A' && *input_line_pointer != 'E'))) TC_PARSE_CONS_EXPRESSION (exp, nbytes); else { unsigned int scan; unsigned int result = 0; /* An MRI style string. Cut into as many bytes as will fit into a nbyte chunk, left justify if necessary, and separate with commas so we can try again later. */ if (*input_line_pointer == 'A') ++input_line_pointer; else if (*input_line_pointer == 'E') { as_bad (_("EBCDIC constants are not supported")); ++input_line_pointer; } input_line_pointer++; for (scan = 0; scan < nbytes; scan++) { if (*input_line_pointer == '\'') { if (input_line_pointer[1] == '\'') { input_line_pointer++; } else break; } result = (result << 8) | (*input_line_pointer++); } /* Left justify. */ while (scan < nbytes) { result <<= 8; scan++; } /* Create correct expression. */ exp->X_op = O_constant; exp->X_add_number = result; /* Fake it so that we can read the next char too. */ if (input_line_pointer[0] != '\'' || (input_line_pointer[0] == '\'' && input_line_pointer[1] == '\'')) { input_line_pointer -= 2; input_line_pointer[0] = ','; input_line_pointer[1] = '\''; } else input_line_pointer++; } } #endif /* TC_M68K */ #ifdef REPEAT_CONS_EXPRESSIONS /* Parse a repeat expression for cons. This is used by the MIPS assembler. The format is NUMBER:COUNT; NUMBER appears in the object file COUNT times. To use this for a target, define REPEAT_CONS_EXPRESSIONS. */ static void parse_repeat_cons (exp, nbytes) expressionS *exp; unsigned int nbytes; { expressionS count; int i; expression (exp); if (*input_line_pointer != ':') { /* No repeat count. */ return; } ++input_line_pointer; expression (&count); if (count.X_op != O_constant || count.X_add_number <= 0) { as_warn (_("unresolvable or nonpositive repeat count; using 1")); return; } /* The cons function is going to output this expression once. So we output it count - 1 times. */ for (i = count.X_add_number - 1; i > 0; i--) emit_expr (exp, nbytes); } #endif /* REPEAT_CONS_EXPRESSIONS */ /* Parse a floating point number represented as a hex constant. This permits users to specify the exact bits they want in the floating point number. */ static int hex_float (int float_type, char *bytes) { int length; int i; switch (float_type) { case 'f': case 'F': case 's': case 'S': length = 4; break; case 'd': case 'D': case 'r': case 'R': length = 8; break; case 'x': case 'X': length = 12; break; case 'p': case 'P': length = 12; break; default: as_bad (_("unknown floating type type '%c'"), float_type); return -1; } /* It would be nice if we could go through expression to parse the hex constant, but if we get a bignum it's a pain to sort it into the buffer correctly. */ i = 0; while (hex_p (*input_line_pointer) || *input_line_pointer == '_') { int d; /* The MRI assembler accepts arbitrary underscores strewn about through the hex constant, so we ignore them as well. */ if (*input_line_pointer == '_') { ++input_line_pointer; continue; } if (i >= length) { as_warn (_("floating point constant too large")); return -1; } d = hex_value (*input_line_pointer) << 4; ++input_line_pointer; while (*input_line_pointer == '_') ++input_line_pointer; if (hex_p (*input_line_pointer)) { d += hex_value (*input_line_pointer); ++input_line_pointer; } if (target_big_endian) bytes[i] = d; else bytes[length - i - 1] = d; ++i; } if (i < length) { if (target_big_endian) memset (bytes + i, 0, length - i); else memset (bytes, 0, length - i); } return length; } /* float_cons() CONStruct some more frag chars of .floats .ffloats etc. Makes 0 or more new frags. If need_pass_2 == 1, no frags are emitted. This understands only floating literals, not expressions. Sorry. A floating constant is defined by atof_generic(), except it is preceded by 0d 0f 0g or 0h. After observing the STRANGE way my BSD AS does its reading, I decided to be incompatible. This always tries to give you rounded bits to the precision of the pseudo-op. Former AS did premature truncation, restored noisy bits instead of trailing 0s AND gave you a choice of 2 flavours of noise according to which of 2 floating-point scanners you directed AS to use. In: input_line_pointer->whitespace before, or '0' of flonum. */ void float_cons (/* Clobbers input_line-pointer, checks end-of-line. */ int float_type /* 'f':.ffloat ... 'F':.float ... */) { char *p; int length; /* Number of chars in an object. */ char *err; /* Error from scanning floating literal. */ char temp[MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT]; if (is_it_end_of_statement ()) { demand_empty_rest_of_line (); return; } #ifdef md_flush_pending_output md_flush_pending_output (); #endif #ifdef md_cons_align md_cons_align (1); #endif do { /* input_line_pointer->1st char of a flonum (we hope!). */ SKIP_WHITESPACE (); /* Skip any 0{letter} that may be present. Don't even check if the letter is legal. Someone may invent a "z" format and this routine has no use for such information. Lusers beware: you get diagnostics if your input is ill-conditioned. */ if (input_line_pointer[0] == '0' && ISALPHA (input_line_pointer[1])) input_line_pointer += 2; /* Accept :xxxx, where the x's are hex digits, for a floating point with the exact digits specified. */ if (input_line_pointer[0] == ':') { ++input_line_pointer; length = hex_float (float_type, temp); if (length < 0) { ignore_rest_of_line (); return; } } else { err = md_atof (float_type, temp, &length); know (length <= MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT); know (err != NULL || length > 0); if (err) { as_bad (_("bad floating literal: %s"), err); ignore_rest_of_line (); return; } } if (!need_pass_2) { int count; count = 1; #ifdef REPEAT_CONS_EXPRESSIONS if (*input_line_pointer == ':') { expressionS count_exp; ++input_line_pointer; expression (&count_exp); if (count_exp.X_op != O_constant || count_exp.X_add_number <= 0) as_warn (_("unresolvable or nonpositive repeat count; using 1")); else count = count_exp.X_add_number; } #endif while (--count >= 0) { p = frag_more (length); memcpy (p, temp, (unsigned int) length); } } SKIP_WHITESPACE (); } while (*input_line_pointer++ == ','); /* Put terminator back into stream. */ --input_line_pointer; demand_empty_rest_of_line (); } /* Return the size of a LEB128 value. */ static inline int sizeof_sleb128 (offsetT value) { int size = 0; unsigned byte; do { byte = (value & 0x7f); /* Sadly, we cannot rely on typical arithmetic right shift behaviour. Fortunately, we can structure things so that the extra work reduces to a noop on systems that do things "properly". */ value = (value >> 7) | ~(-(offsetT)1 >> 7); size += 1; } while (!(((value == 0) && ((byte & 0x40) == 0)) || ((value == -1) && ((byte & 0x40) != 0)))); return size; } static inline int sizeof_uleb128 (valueT value) { int size = 0; do { value >>= 7; size += 1; } while (value != 0); return size; } int sizeof_leb128 (valueT value, int sign) { if (sign) return sizeof_sleb128 ((offsetT) value); else return sizeof_uleb128 (value); } /* Output a LEB128 value. */ static inline int output_sleb128 (char *p, offsetT value) { char *orig = p; int more; do { unsigned byte = (value & 0x7f); /* Sadly, we cannot rely on typical arithmetic right shift behaviour. Fortunately, we can structure things so that the extra work reduces to a noop on systems that do things "properly". */ value = (value >> 7) | ~(-(offsetT)1 >> 7); more = !((((value == 0) && ((byte & 0x40) == 0)) || ((value == -1) && ((byte & 0x40) != 0)))); if (more) byte |= 0x80; *p++ = byte; } while (more); return p - orig; } static inline int output_uleb128 (char *p, valueT value) { char *orig = p; do { unsigned byte = (value & 0x7f); value >>= 7; if (value != 0) /* More bytes to follow. */ byte |= 0x80; *p++ = byte; } while (value != 0); return p - orig; } int output_leb128 (char *p, valueT value, int sign) { if (sign) return output_sleb128 (p, (offsetT) value); else return output_uleb128 (p, value); } /* Do the same for bignums. We combine sizeof with output here in that we don't output for NULL values of P. It isn't really as critical as for "normal" values that this be streamlined. */ static inline int output_big_sleb128 (char *p, LITTLENUM_TYPE *bignum, int size) { char *orig = p; valueT val = 0; int loaded = 0; unsigned byte; /* Strip leading sign extensions off the bignum. */ while (size > 1 && bignum[size - 1] == LITTLENUM_MASK && bignum[size - 2] > LITTLENUM_MASK / 2) size--; do { /* OR in the next part of the littlenum. */ val |= (*bignum << loaded); loaded += LITTLENUM_NUMBER_OF_BITS; size--; bignum++; /* Add bytes until there are less than 7 bits left in VAL or until every non-sign bit has been written. */ do { byte = val & 0x7f; loaded -= 7; val >>= 7; if (size > 0 || val != ((byte & 0x40) == 0 ? 0 : ((valueT) 1 << loaded) - 1)) byte |= 0x80; if (orig) *p = byte; p++; } while ((byte & 0x80) != 0 && loaded >= 7); } while (size > 0); /* Mop up any left-over bits (of which there will be less than 7). */ if ((byte & 0x80) != 0) { /* Sign-extend VAL. */ if (val & (1 << (loaded - 1))) val |= ~0 << loaded; if (orig) *p = val & 0x7f; p++; } return p - orig; } static inline int output_big_uleb128 (char *p, LITTLENUM_TYPE *bignum, int size) { char *orig = p; valueT val = 0; int loaded = 0; unsigned byte; /* Strip leading zeros off the bignum. */ /* XXX: Is this needed? */ while (size > 0 && bignum[size - 1] == 0) size--; do { if (loaded < 7 && size > 0) { val |= (*bignum << loaded); loaded += 8 * CHARS_PER_LITTLENUM; size--; bignum++; } byte = val & 0x7f; loaded -= 7; val >>= 7; if (size > 0 || val) byte |= 0x80; if (orig) *p = byte; p++; } while (byte & 0x80); return p - orig; } static int output_big_leb128 (char *p, LITTLENUM_TYPE *bignum, int size, int sign) { if (sign) return output_big_sleb128 (p, bignum, size); else return output_big_uleb128 (p, bignum, size); } /* Generate the appropriate fragments for a given expression to emit a leb128 value. */ static void emit_leb128_expr (expressionS *exp, int sign) { operatorT op = exp->X_op; unsigned int nbytes; if (op == O_absent || op == O_illegal) { as_warn (_("zero assumed for missing expression")); exp->X_add_number = 0; op = O_constant; } else if (op == O_big && exp->X_add_number <= 0) { as_bad (_("floating point number invalid")); exp->X_add_number = 0; op = O_constant; } else if (op == O_register) { as_warn (_("register value used as expression")); op = O_constant; } else if (op == O_constant && sign && (exp->X_add_number < 0) != !exp->X_unsigned) { /* We're outputting a signed leb128 and the sign of X_add_number doesn't reflect the sign of the original value. Convert EXP to a correctly-extended bignum instead. */ convert_to_bignum (exp); op = O_big; } /* Let check_eh_frame know that data is being emitted. nbytes == -1 is a signal that this is leb128 data. It shouldn't optimize this away. */ nbytes = (unsigned int) -1; if (check_eh_frame (exp, &nbytes)) abort (); /* Let the backend know that subsequent data may be byte aligned. */ #ifdef md_cons_align md_cons_align (1); #endif if (op == O_constant) { /* If we've got a constant, emit the thing directly right now. */ valueT value = exp->X_add_number; int size; char *p; size = sizeof_leb128 (value, sign); p = frag_more (size); output_leb128 (p, value, sign); } else if (op == O_big) { /* O_big is a different sort of constant. */ int size; char *p; size = output_big_leb128 (NULL, generic_bignum, exp->X_add_number, sign); p = frag_more (size); output_big_leb128 (p, generic_bignum, exp->X_add_number, sign); } else { /* Otherwise, we have to create a variable sized fragment and resolve things later. */ frag_var (rs_leb128, sizeof_uleb128 (~(valueT) 0), 0, sign, make_expr_symbol (exp), 0, (char *) NULL); } } /* Parse the .sleb128 and .uleb128 pseudos. */ void s_leb128 (int sign) { expressionS exp; #ifdef md_flush_pending_output md_flush_pending_output (); #endif do { expression (&exp); emit_leb128_expr (&exp, sign); } while (*input_line_pointer++ == ','); input_line_pointer--; demand_empty_rest_of_line (); } static void stringer_append_char (int c, int bitsize) { if (!target_big_endian) FRAG_APPEND_1_CHAR (c); switch (bitsize) { case 64: FRAG_APPEND_1_CHAR (0); FRAG_APPEND_1_CHAR (0); FRAG_APPEND_1_CHAR (0); FRAG_APPEND_1_CHAR (0); /* Fall through. */ case 32: FRAG_APPEND_1_CHAR (0); FRAG_APPEND_1_CHAR (0); /* Fall through. */ case 16: FRAG_APPEND_1_CHAR (0); /* Fall through. */ case 8: break; default: /* Called with invalid bitsize argument. */ abort (); break; } if (target_big_endian) FRAG_APPEND_1_CHAR (c); } /* Worker to do .ascii etc statements. Reads 0 or more ',' separated, double-quoted strings. Caller should have checked need_pass_2 is FALSE because we don't check it. Checks for end-of-line. BITS_APPENDZERO says how many bits are in a target char. The bottom bit is set if a NUL char should be appended to the strings. */ void stringer (int bits_appendzero) { const int bitsize = bits_appendzero & ~7; const int append_zero = bits_appendzero & 1; unsigned int c; #if !defined(NO_LISTING) && defined (OBJ_ELF) char *start; #endif #ifdef md_flush_pending_output md_flush_pending_output (); #endif #ifdef md_cons_align md_cons_align (1); #endif /* The following awkward logic is to parse ZERO or more strings, comma separated. Recall a string expression includes spaces before the opening '\"' and spaces after the closing '\"'. We fake a leading ',' if there is (supposed to be) a 1st, expression. We keep demanding expressions for each ','. */ if (is_it_end_of_statement ()) { c = 0; /* Skip loop. */ ++input_line_pointer; /* Compensate for end of loop. */ } else { c = ','; /* Do loop. */ } /* If we have been switched into the abs_section then we will not have an obstack onto which we can hang strings. */ if (now_seg == absolute_section) { as_bad (_("strings must be placed into a section")); c = 0; ignore_rest_of_line (); } while (c == ',' || c == '<' || c == '"') { SKIP_WHITESPACE (); switch (*input_line_pointer) { case '\"': ++input_line_pointer; /*->1st char of string. */ #if !defined(NO_LISTING) && defined (OBJ_ELF) start = input_line_pointer; #endif while (is_a_char (c = next_char_of_string ())) stringer_append_char (c, bitsize); if (append_zero) stringer_append_char (0, bitsize); know (input_line_pointer[-1] == '\"'); #if !defined(NO_LISTING) && defined (OBJ_ELF) /* In ELF, when gcc is emitting DWARF 1 debugging output, it will emit .string with a filename in the .debug section after a sequence of constants. See the comment in emit_expr for the sequence. emit_expr will set dwarf_file_string to non-zero if this string might be a source file name. */ if (strcmp (segment_name (now_seg), ".debug") != 0) dwarf_file_string = 0; else if (dwarf_file_string) { c = input_line_pointer[-1]; input_line_pointer[-1] = '\0'; listing_source_file (start); input_line_pointer[-1] = c; } #endif break; case '<': input_line_pointer++; c = get_single_number (); stringer_append_char (c, bitsize); if (*input_line_pointer != '>') as_bad (_("expected <nn>")); input_line_pointer++; break; case ',': input_line_pointer++; break; } SKIP_WHITESPACE (); c = *input_line_pointer; } demand_empty_rest_of_line (); } /* FIXME-SOMEDAY: I had trouble here on characters with the high bits set. We'll probably also have trouble with multibyte chars, wide chars, etc. Also be careful about returning values bigger than 1 byte. xoxorich. */ unsigned int next_char_of_string (void) { unsigned int c; c = *input_line_pointer++ & CHAR_MASK; switch (c) { case '\"': c = NOT_A_CHAR; break; case '\n': as_warn (_("unterminated string; newline inserted")); bump_line_counters (); break; #ifndef NO_STRING_ESCAPES case '\\': switch (c = *input_line_pointer++) { case 'b': c = '\b'; break; case 'f': c = '\f'; break; case 'n': c = '\n'; break; case 'r': c = '\r'; break; case 't': c = '\t'; break; case 'v': c = '\013'; break; case '\\': case '"': break; /* As itself. */ case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': { long number; int i; for (i = 0, number = 0; ISDIGIT (c) && i < 3; c = *input_line_pointer++, i++) { number = number * 8 + c - '0'; } c = number & 0xff; } --input_line_pointer; break; case 'x': case 'X': { long number; number = 0; c = *input_line_pointer++; while (ISXDIGIT (c)) { if (ISDIGIT (c)) number = number * 16 + c - '0'; else if (ISUPPER (c)) number = number * 16 + c - 'A' + 10; else number = number * 16 + c - 'a' + 10; c = *input_line_pointer++; } c = number & 0xff; --input_line_pointer; } break; case '\n': /* To be compatible with BSD 4.2 as: give the luser a linefeed!! */ as_warn (_("unterminated string; newline inserted")); c = '\n'; bump_line_counters (); break; default: #ifdef ONLY_STANDARD_ESCAPES as_bad (_("bad escaped character in string")); c = '?'; #endif /* ONLY_STANDARD_ESCAPES */ break; } break; #endif /* ! defined (NO_STRING_ESCAPES) */ default: break; } return (c); } static segT get_segmented_expression (expressionS *expP) { segT retval; retval = expression (expP); if (expP->X_op == O_illegal || expP->X_op == O_absent || expP->X_op == O_big) { as_bad (_("expected address expression")); expP->X_op = O_constant; expP->X_add_number = 0; retval = absolute_section; } return retval; } static segT get_known_segmented_expression (expressionS *expP) { segT retval = get_segmented_expression (expP); if (retval == undefined_section) { /* There is no easy way to extract the undefined symbol from the expression. */ if (expP->X_add_symbol != NULL && S_GET_SEGMENT (expP->X_add_symbol) != expr_section) as_warn (_("symbol \"%s\" undefined; zero assumed"), S_GET_NAME (expP->X_add_symbol)); else as_warn (_("some symbol undefined; zero assumed")); retval = absolute_section; expP->X_op = O_constant; expP->X_add_number = 0; } return retval; } char /* Return terminator. */ get_absolute_expression_and_terminator (long *val_pointer /* Return value of expression. */) { /* FIXME: val_pointer should probably be offsetT *. */ *val_pointer = (long) get_absolute_expression (); return (*input_line_pointer++); } /* Like demand_copy_string, but return NULL if the string contains any '\0's. Give a warning if that happens. */ char * demand_copy_C_string (int *len_pointer) { char *s; if ((s = demand_copy_string (len_pointer)) != 0) { int len; for (len = *len_pointer; len > 0; len--) { if (*s == 0) { s = 0; len = 1; *len_pointer = 0; as_bad (_("this string may not contain \'\\0\'")); } } } return s; } /* Demand string, but return a safe (=private) copy of the string. Return NULL if we can't read a string here. */ char * demand_copy_string (int *lenP) { unsigned int c; int len; char *retval; len = 0; SKIP_WHITESPACE (); if (*input_line_pointer == '\"') { input_line_pointer++; /* Skip opening quote. */ while (is_a_char (c = next_char_of_string ())) { obstack_1grow (¬es, c); len++; } /* JF this next line is so demand_copy_C_string will return a null terminated string. */ obstack_1grow (¬es, '\0'); retval = (char *) obstack_finish (¬es); } else { as_bad (_("missing string")); retval = NULL; ignore_rest_of_line (); } *lenP = len; return (retval); } /* In: Input_line_pointer->next character. Do: Skip input_line_pointer over all whitespace. Out: 1 if input_line_pointer->end-of-line. */ int is_it_end_of_statement (void) { SKIP_WHITESPACE (); return (is_end_of_line[(unsigned char) *input_line_pointer]); } void equals (char *sym_name, int reassign) { char *stop = NULL; char stopc = 0; input_line_pointer++; if (*input_line_pointer == '=') input_line_pointer++; if (reassign < 0 && *input_line_pointer == '=') input_line_pointer++; while (*input_line_pointer == ' ' || *input_line_pointer == '\t') input_line_pointer++; if (flag_mri) stop = mri_comment_field (&stopc); assign_symbol (sym_name, reassign >= 0 ? !reassign : reassign); if (flag_mri) { demand_empty_rest_of_line (); mri_comment_end (stop, stopc); } } /* .incbin -- include a file verbatim at the current location. */ void s_incbin (int x ATTRIBUTE_UNUSED) { FILE * binfile; char * path; char * filename; char * binfrag; long skip = 0; long count = 0; long bytes; int len; #ifdef md_flush_pending_output md_flush_pending_output (); #endif #ifdef md_cons_align md_cons_align (1); #endif SKIP_WHITESPACE (); filename = demand_copy_string (& len); if (filename == NULL) return; SKIP_WHITESPACE (); /* Look for optional skip and count. */ if (* input_line_pointer == ',') { ++ input_line_pointer; skip = get_absolute_expression (); SKIP_WHITESPACE (); if (* input_line_pointer == ',') { ++ input_line_pointer; count = get_absolute_expression (); if (count == 0) as_warn (_(".incbin count zero, ignoring `%s'"), filename); SKIP_WHITESPACE (); } } demand_empty_rest_of_line (); /* Try opening absolute path first, then try include dirs. */ binfile = fopen (filename, FOPEN_RB); if (binfile == NULL) { int i; path = (char *) xmalloc ((unsigned long) len + include_dir_maxlen + 5); for (i = 0; i < include_dir_count; i++) { sprintf (path, "%s/%s", include_dirs[i], filename); binfile = fopen (path, FOPEN_RB); if (binfile != NULL) break; } if (binfile == NULL) as_bad (_("file not found: %s"), filename); } else path = xstrdup (filename); if (binfile) { long file_len; register_dependency (path); /* Compute the length of the file. */ if (fseek (binfile, 0, SEEK_END) != 0) { as_bad (_("seek to end of .incbin file failed `%s'"), path); goto done; } file_len = ftell (binfile); /* If a count was not specified use the remainder of the file. */ if (count == 0) count = file_len - skip; if (skip < 0 || count < 0 || file_len < 0 || skip + count > file_len) { as_bad (_("skip (%ld) or count (%ld) invalid for file size (%ld)"), skip, count, file_len); goto done; } if (fseek (binfile, skip, SEEK_SET) != 0) { as_bad (_("could not skip to %ld in file `%s'"), skip, path); goto done; } /* Allocate frag space and store file contents in it. */ binfrag = frag_more (count); bytes = fread (binfrag, 1, count, binfile); if (bytes < count) as_warn (_("truncated file `%s', %ld of %ld bytes read"), path, bytes, count); } done: if (binfile != NULL) fclose (binfile); if (path) free (path); } /* .include -- include a file at this point. */ void s_include (int arg ATTRIBUTE_UNUSED) { char *filename; int i; FILE *try_file; char *path; if (!flag_m68k_mri) { filename = demand_copy_string (&i); if (filename == NULL) { /* demand_copy_string has already printed an error and called ignore_rest_of_line. */ return; } } else { SKIP_WHITESPACE (); i = 0; while (!is_end_of_line[(unsigned char) *input_line_pointer] && *input_line_pointer != ' ' && *input_line_pointer != '\t') { obstack_1grow (¬es, *input_line_pointer); ++input_line_pointer; ++i; } obstack_1grow (¬es, '\0'); filename = (char *) obstack_finish (¬es); while (!is_end_of_line[(unsigned char) *input_line_pointer]) ++input_line_pointer; } demand_empty_rest_of_line (); path = (char *) xmalloc ((unsigned long) i + include_dir_maxlen + 5 /* slop */ ); for (i = 0; i < include_dir_count; i++) { strcpy (path, include_dirs[i]); strcat (path, "/"); strcat (path, filename); if (0 != (try_file = fopen (path, FOPEN_RT))) { fclose (try_file); goto gotit; } } free (path); path = filename; gotit: /* malloc Storage leak when file is found on path. FIXME-SOMEDAY. */ register_dependency (path); input_scrub_insert_file (path); } void add_include_dir (char *path) { int i; if (include_dir_count == 0) { include_dirs = (char **) xmalloc (2 * sizeof (*include_dirs)); include_dirs[0] = "."; /* Current dir. */ include_dir_count = 2; } else { include_dir_count++; include_dirs = (char **) realloc (include_dirs, include_dir_count * sizeof (*include_dirs)); } include_dirs[include_dir_count - 1] = path; /* New one. */ i = strlen (path); if (i > include_dir_maxlen) include_dir_maxlen = i; } /* Output debugging information to denote the source file. */ static void generate_file_debug (void) { if (debug_type == DEBUG_STABS) stabs_generate_asm_file (); } /* Output line number debugging information for the current source line. */ void generate_lineno_debug (void) { switch (debug_type) { case DEBUG_UNSPECIFIED: case DEBUG_NONE: case DEBUG_DWARF: break; case DEBUG_STABS: stabs_generate_asm_lineno (); break; case DEBUG_ECOFF: ecoff_generate_asm_lineno (); break; case DEBUG_DWARF2: /* ??? We could here indicate to dwarf2dbg.c that something has changed. However, since there is additional backend support that is required (calling dwarf2_emit_insn), we let dwarf2dbg.c call as_where on its own. */ break; } } /* Output debugging information to mark a function entry point or end point. END_P is zero for .func, and non-zero for .endfunc. */ void s_func (int end_p) { do_s_func (end_p, NULL); } /* Subroutine of s_func so targets can choose a different default prefix. If DEFAULT_PREFIX is NULL, use the target's "leading char". */ static void do_s_func (int end_p, const char *default_prefix) { /* Record the current function so that we can issue an error message for misplaced .func,.endfunc, and also so that .endfunc needs no arguments. */ static char *current_name; static char *current_label; if (end_p) { if (current_name == NULL) { as_bad (_("missing .func")); ignore_rest_of_line (); return; } if (debug_type == DEBUG_STABS) stabs_generate_asm_endfunc (current_name, current_label); current_name = current_label = NULL; } else /* ! end_p */ { char *name, *label; char delim1, delim2; if (current_name != NULL) { as_bad (_(".endfunc missing for previous .func")); ignore_rest_of_line (); return; } name = input_line_pointer; delim1 = get_symbol_end (); name = xstrdup (name); *input_line_pointer = delim1; SKIP_WHITESPACE (); if (*input_line_pointer != ',') { if (default_prefix) { if (asprintf (&label, "%s%s", default_prefix, name) == -1) as_fatal ("%s", xstrerror (errno)); } else { char leading_char = bfd_get_symbol_leading_char (stdoutput); /* Missing entry point, use function's name with the leading char prepended. */ if (leading_char) { if (asprintf (&label, "%c%s", leading_char, name) == -1) as_fatal ("%s", xstrerror (errno)); } else label = name; } } else { ++input_line_pointer; SKIP_WHITESPACE (); label = input_line_pointer; delim2 = get_symbol_end (); label = xstrdup (label); *input_line_pointer = delim2; } if (debug_type == DEBUG_STABS) stabs_generate_asm_func (name, label); current_name = name; current_label = label; } demand_empty_rest_of_line (); } void s_ignore (int arg ATTRIBUTE_UNUSED) { ignore_rest_of_line (); } void read_print_statistics (FILE *file) { hash_print_statistics (file, "pseudo-op table", po_hash); } /* Inserts the given line into the input stream. This call avoids macro/conditionals nesting checking, since the contents of the line are assumed to replace the contents of a line already scanned. An appropriate use of this function would be substitution of input lines when called by md_start_line_hook(). The given line is assumed to already be properly scrubbed. */ void input_scrub_insert_line (const char *line) { sb newline; sb_new (&newline); sb_add_string (&newline, line); input_scrub_include_sb (&newline, input_line_pointer, 0); sb_kill (&newline); buffer_limit = input_scrub_next_buffer (&input_line_pointer); } /* Insert a file into the input stream; the path must resolve to an actual file; no include path searching or dependency registering is performed. */ void input_scrub_insert_file (char *path) { input_scrub_include_file (path, input_line_pointer); buffer_limit = input_scrub_next_buffer (&input_line_pointer); } /* Find the end of a line, considering quotation and escaping of quotes. */ #if !defined(TC_SINGLE_QUOTE_STRINGS) && defined(SINGLE_QUOTE_STRINGS) # define TC_SINGLE_QUOTE_STRINGS 1 #endif static char * _find_end_of_line (char *s, int mri_string, int insn ATTRIBUTE_UNUSED, int in_macro) { char inquote = '\0'; int inescape = 0; while (!is_end_of_line[(unsigned char) *s] || (inquote && !ISCNTRL (*s)) || (inquote == '\'' && flag_mri) #ifdef TC_EOL_IN_INSN || (insn && TC_EOL_IN_INSN (s)) #endif /* PR 6926: When we are parsing the body of a macro the sequence \@ is special - it refers to the invocation count. If the @ character happens to be registered as a line-separator character by the target, then the is_end_of_line[] test above will have returned true, but we need to ignore the line separating semantics in this particular case. */ || (in_macro && inescape && *s == '@') ) { if (mri_string && *s == '\'') inquote ^= *s; else if (inescape) inescape = 0; else if (*s == '\\') inescape = 1; else if (!inquote ? *s == '"' #ifdef TC_SINGLE_QUOTE_STRINGS || (TC_SINGLE_QUOTE_STRINGS && *s == '\'') #endif : *s == inquote) inquote ^= *s; ++s; } if (inquote) as_warn (_("missing closing `%c'"), inquote); if (inescape) as_warn (_("stray `\\'")); return s; } char * find_end_of_line (char *s, int mri_string) { return _find_end_of_line (s, mri_string, 0, 0); }
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