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jlechner |
/* elfos.h -- operating system specific defines to be used when
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targeting GCC for some generic ELF system
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Copyright (C) 1991, 1994, 1995, 1999, 2000, 2001, 2002, 2003, 2004
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Free Software Foundation, Inc.
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Based on svr4.h contributed by Ron Guilmette (rfg@netcom.com).
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to
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the Free Software Foundation, 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#define TARGET_OBJFMT_CPP_BUILTINS() \
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do \
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{ \
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builtin_define ("__ELF__"); \
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} \
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while (0)
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/* Define a symbol indicating that we are using elfos.h.
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Some CPU specific configuration files use this. */
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#define USING_ELFOS_H
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/* The prefix to add to user-visible assembler symbols.
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For ELF systems the convention is *not* to prepend a leading
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underscore onto user-level symbol names. */
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#undef USER_LABEL_PREFIX
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#define USER_LABEL_PREFIX ""
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/* Biggest alignment supported by the object file format of this
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machine. Use this macro to limit the alignment which can be
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specified using the `__attribute__ ((aligned (N)))' construct. If
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not defined, the default value is `BIGGEST_ALIGNMENT'. */
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#ifndef MAX_OFILE_ALIGNMENT
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#define MAX_OFILE_ALIGNMENT (32768 * 8)
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#endif
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/* Use periods rather than dollar signs in special g++ assembler names. */
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#define NO_DOLLAR_IN_LABEL
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/* Writing `int' for a bit-field forces int alignment for the structure. */
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#ifndef PCC_BITFIELD_TYPE_MATTERS
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#define PCC_BITFIELD_TYPE_MATTERS 1
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#endif
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61 |
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/* Handle #pragma weak and #pragma pack. */
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#define HANDLE_SYSV_PRAGMA 1
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/* All ELF targets can support DWARF-2. */
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#define DWARF2_DEBUGGING_INFO 1
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/* The GNU tools operate better with dwarf2, and it is required by some
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psABI's. Since we don't have any native tools to be compatible with,
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default to dwarf2. */
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#ifndef PREFERRED_DEBUGGING_TYPE
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#define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
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#endif
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/* All SVR4 targets use the ELF object file format. */
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#define OBJECT_FORMAT_ELF
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/* Output #ident as a .ident. */
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#define ASM_OUTPUT_IDENT(FILE, NAME) \
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fprintf (FILE, "%s\"%s\"\n", IDENT_ASM_OP, NAME);
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#define IDENT_ASM_OP "\t.ident\t"
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#undef SET_ASM_OP
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#define SET_ASM_OP "\t.set\t"
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/* Most svr4 assemblers want a .file directive at the beginning of
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their input file. */
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#define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
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/* This is how to allocate empty space in some section. The .zero
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pseudo-op is used for this on most svr4 assemblers. */
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#define SKIP_ASM_OP "\t.zero\t"
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#undef ASM_OUTPUT_SKIP
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#define ASM_OUTPUT_SKIP(FILE, SIZE) \
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fprintf ((FILE), "%s"HOST_WIDE_INT_PRINT_UNSIGNED"\n",\
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SKIP_ASM_OP, (SIZE))
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/* This is how to store into the string LABEL
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the symbol_ref name of an internal numbered label where
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PREFIX is the class of label and NUM is the number within the class.
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This is suitable for output with `assemble_name'.
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For most svr4 systems, the convention is that any symbol which begins
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with a period is not put into the linker symbol table by the assembler. */
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#undef ASM_GENERATE_INTERNAL_LABEL
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#define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
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do \
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{ \
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sprintf (LABEL, "*.%s%u", PREFIX, (unsigned) (NUM)); \
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} \
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while (0)
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/* Output the label which precedes a jumptable. Note that for all svr4
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systems where we actually generate jumptables (which is to say every
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svr4 target except i386, where we use casesi instead) we put the jump-
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tables into the .rodata section and since other stuff could have been
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put into the .rodata section prior to any given jumptable, we have to
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make sure that the location counter for the .rodata section gets pro-
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perly re-aligned prior to the actual beginning of the jump table. */
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#undef ALIGN_ASM_OP
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#define ALIGN_ASM_OP "\t.align\t"
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#ifndef ASM_OUTPUT_BEFORE_CASE_LABEL
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#define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE, PREFIX, NUM, TABLE) \
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ASM_OUTPUT_ALIGN ((FILE), 2);
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#endif
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#undef ASM_OUTPUT_CASE_LABEL
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#define ASM_OUTPUT_CASE_LABEL(FILE, PREFIX, NUM, JUMPTABLE) \
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do \
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{ \
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ASM_OUTPUT_BEFORE_CASE_LABEL (FILE, PREFIX, NUM, JUMPTABLE) \
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(*targetm.asm_out.internal_label) (FILE, PREFIX, NUM); \
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} \
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while (0)
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/* The standard SVR4 assembler seems to require that certain builtin
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library routines (e.g. .udiv) be explicitly declared as .globl
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in each assembly file where they are referenced. */
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#define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
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(*targetm.asm_out.globalize_label) (FILE, XSTR (FUN, 0))
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/* This says how to output assembler code to declare an
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uninitialized external linkage data object. Under SVR4,
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the linker seems to want the alignment of data objects
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to depend on their types. We do exactly that here. */
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#define COMMON_ASM_OP "\t.comm\t"
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#undef ASM_OUTPUT_ALIGNED_COMMON
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#define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
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do \
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{ \
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fprintf ((FILE), "%s", COMMON_ASM_OP); \
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assemble_name ((FILE), (NAME)); \
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fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", \
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(SIZE), (ALIGN) / BITS_PER_UNIT); \
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} \
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while (0)
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/* This says how to output assembler code to declare an
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uninitialized internal linkage data object. Under SVR4,
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the linker seems to want the alignment of data objects
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to depend on their types. We do exactly that here. */
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#define LOCAL_ASM_OP "\t.local\t"
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#undef ASM_OUTPUT_ALIGNED_LOCAL
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#define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \
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do \
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{ \
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fprintf ((FILE), "%s", LOCAL_ASM_OP); \
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assemble_name ((FILE), (NAME)); \
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fprintf ((FILE), "\n"); \
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ASM_OUTPUT_ALIGNED_COMMON (FILE, NAME, SIZE, ALIGN); \
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} \
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while (0)
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/* This is the pseudo-op used to generate a contiguous sequence of byte
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values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
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AUTOMATICALLY APPENDED. This is the same for most svr4 assemblers. */
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#undef ASCII_DATA_ASM_OP
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#define ASCII_DATA_ASM_OP "\t.ascii\t"
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196 |
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/* Support a read-only data section. */
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#define READONLY_DATA_SECTION_ASM_OP "\t.section\t.rodata"
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/* On svr4, we *do* have support for the .init and .fini sections, and we
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can put stuff in there to be executed before and after `main'. We let
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crtstuff.c and other files know this by defining the following symbols.
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The definitions say how to change sections to the .init and .fini
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sections. This is the same for all known svr4 assemblers. */
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#define INIT_SECTION_ASM_OP "\t.section\t.init"
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#define FINI_SECTION_ASM_OP "\t.section\t.fini"
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/* Output assembly directive to move to the beginning of current section. */
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#ifdef HAVE_GAS_SUBSECTION_ORDERING
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# define ASM_SECTION_START_OP "\t.subsection\t-1"
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# define ASM_OUTPUT_SECTION_START(FILE) \
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fprintf ((FILE), "%s\n", ASM_SECTION_START_OP)
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#endif
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#define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
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/* Switch into a generic section. */
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#define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
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#undef TARGET_ASM_SELECT_RTX_SECTION
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#define TARGET_ASM_SELECT_RTX_SECTION default_elf_select_rtx_section
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#undef TARGET_ASM_SELECT_SECTION
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#define TARGET_ASM_SELECT_SECTION default_elf_select_section
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/* Define the strings used for the special svr4 .type and .size directives.
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These strings generally do not vary from one system running svr4 to
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another, but if a given system (e.g. m88k running svr) needs to use
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different pseudo-op names for these, they may be overridden in the
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file which includes this one. */
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#define TYPE_ASM_OP "\t.type\t"
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#define SIZE_ASM_OP "\t.size\t"
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/* This is how we tell the assembler that a symbol is weak. */
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#define ASM_WEAKEN_LABEL(FILE, NAME) \
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do \
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{ \
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fputs ("\t.weak\t", (FILE)); \
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assemble_name ((FILE), (NAME)); \
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fputc ('\n', (FILE)); \
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} \
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243 |
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while (0)
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245 |
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/* The following macro defines the format used to output the second
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246 |
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operand of the .type assembler directive. Different svr4 assemblers
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expect various different forms for this operand. The one given here
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248 |
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is just a default. You may need to override it in your machine-
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249 |
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specific tm.h file (depending upon the particulars of your assembler). */
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250 |
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251 |
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#define TYPE_OPERAND_FMT "@%s"
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|
253 |
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/* Write the extra assembler code needed to declare a function's result.
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254 |
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Most svr4 assemblers don't require any special declaration of the
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255 |
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result value, but there are exceptions. */
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256 |
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257 |
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#ifndef ASM_DECLARE_RESULT
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258 |
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#define ASM_DECLARE_RESULT(FILE, RESULT)
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259 |
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#endif
|
260 |
|
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|
261 |
|
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/* These macros generate the special .type and .size directives which
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262 |
|
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are used to set the corresponding fields of the linker symbol table
|
263 |
|
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entries in an ELF object file under SVR4. These macros also output
|
264 |
|
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the starting labels for the relevant functions/objects. */
|
265 |
|
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|
266 |
|
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/* Write the extra assembler code needed to declare a function properly.
|
267 |
|
|
Some svr4 assemblers need to also have something extra said about the
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function's return value. We allow for that here. */
|
269 |
|
|
|
270 |
|
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#ifndef ASM_DECLARE_FUNCTION_NAME
|
271 |
|
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#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
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272 |
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do \
|
273 |
|
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{ \
|
274 |
|
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ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function"); \
|
275 |
|
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ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \
|
276 |
|
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ASM_OUTPUT_LABEL (FILE, NAME); \
|
277 |
|
|
} \
|
278 |
|
|
while (0)
|
279 |
|
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#endif
|
280 |
|
|
|
281 |
|
|
/* Write the extra assembler code needed to declare an object properly. */
|
282 |
|
|
|
283 |
|
|
#define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
|
284 |
|
|
do \
|
285 |
|
|
{ \
|
286 |
|
|
HOST_WIDE_INT size; \
|
287 |
|
|
\
|
288 |
|
|
ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \
|
289 |
|
|
\
|
290 |
|
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size_directive_output = 0; \
|
291 |
|
|
if (!flag_inhibit_size_directive \
|
292 |
|
|
&& (DECL) && DECL_SIZE (DECL)) \
|
293 |
|
|
{ \
|
294 |
|
|
size_directive_output = 1; \
|
295 |
|
|
size = int_size_in_bytes (TREE_TYPE (DECL)); \
|
296 |
|
|
ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size); \
|
297 |
|
|
} \
|
298 |
|
|
\
|
299 |
|
|
ASM_OUTPUT_LABEL (FILE, NAME); \
|
300 |
|
|
} \
|
301 |
|
|
while (0)
|
302 |
|
|
|
303 |
|
|
/* Output the size directive for a decl in rest_of_decl_compilation
|
304 |
|
|
in the case where we did not do so before the initializer.
|
305 |
|
|
Once we find the error_mark_node, we know that the value of
|
306 |
|
|
size_directive_output was set
|
307 |
|
|
by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */
|
308 |
|
|
|
309 |
|
|
#undef ASM_FINISH_DECLARE_OBJECT
|
310 |
|
|
#define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END)\
|
311 |
|
|
do \
|
312 |
|
|
{ \
|
313 |
|
|
const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
|
314 |
|
|
HOST_WIDE_INT size; \
|
315 |
|
|
\
|
316 |
|
|
if (!flag_inhibit_size_directive \
|
317 |
|
|
&& DECL_SIZE (DECL) \
|
318 |
|
|
&& ! AT_END && TOP_LEVEL \
|
319 |
|
|
&& DECL_INITIAL (DECL) == error_mark_node \
|
320 |
|
|
&& !size_directive_output) \
|
321 |
|
|
{ \
|
322 |
|
|
size_directive_output = 1; \
|
323 |
|
|
size = int_size_in_bytes (TREE_TYPE (DECL)); \
|
324 |
|
|
ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size); \
|
325 |
|
|
} \
|
326 |
|
|
} \
|
327 |
|
|
while (0)
|
328 |
|
|
|
329 |
|
|
/* This is how to declare the size of a function. */
|
330 |
|
|
#ifndef ASM_DECLARE_FUNCTION_SIZE
|
331 |
|
|
#define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \
|
332 |
|
|
do \
|
333 |
|
|
{ \
|
334 |
|
|
if (!flag_inhibit_size_directive) \
|
335 |
|
|
ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME); \
|
336 |
|
|
} \
|
337 |
|
|
while (0)
|
338 |
|
|
#endif
|
339 |
|
|
|
340 |
|
|
/* A table of bytes codes used by the ASM_OUTPUT_ASCII and
|
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ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table
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corresponds to a particular byte value [0..255]. For any
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given byte value, if the value in the corresponding table
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position is zero, the given character can be output directly.
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If the table value is 1, the byte must be output as a \ooo
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octal escape. If the tables value is anything else, then the
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byte value should be output as a \ followed by the value
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in the table. Note that we can use standard UN*X escape
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sequences for many control characters, but we don't use
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\a to represent BEL because some svr4 assemblers (e.g. on
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the i386) don't know about that. Also, we don't use \v
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since some versions of gas, such as 2.2 did not accept it. */
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#define ESCAPES \
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"\1\1\1\1\1\1\1\1btn\1fr\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
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\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\
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\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\
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\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\1\
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\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
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\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
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\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
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\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1"
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/* Some svr4 assemblers have a limit on the number of characters which
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can appear in the operand of a .string directive. If your assembler
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has such a limitation, you should define STRING_LIMIT to reflect that
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limit. Note that at least some svr4 assemblers have a limit on the
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actual number of bytes in the double-quoted string, and that they
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count each character in an escape sequence as one byte. Thus, an
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escape sequence like \377 would count as four bytes.
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If your target assembler doesn't support the .string directive, you
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should define this to zero.
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*/
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#define STRING_LIMIT ((unsigned) 256)
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#define STRING_ASM_OP "\t.string\t"
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/* The routine used to output NUL terminated strings. We use a special
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version of this for most svr4 targets because doing so makes the
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generated assembly code more compact (and thus faster to assemble)
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as well as more readable, especially for targets like the i386
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(where the only alternative is to output character sequences as
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comma separated lists of numbers). */
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#define ASM_OUTPUT_LIMITED_STRING(FILE, STR) \
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do \
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{ \
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register const unsigned char *_limited_str = \
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(const unsigned char *) (STR); \
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register unsigned ch; \
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\
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fprintf ((FILE), "%s\"", STRING_ASM_OP); \
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\
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for (; (ch = *_limited_str); _limited_str++) \
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{ \
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register int escape; \
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\
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switch (escape = ESCAPES[ch]) \
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{ \
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case 0: \
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putc (ch, (FILE)); \
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break; \
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case 1: \
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fprintf ((FILE), "\\%03o", ch); \
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break; \
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default: \
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putc ('\\', (FILE)); \
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putc (escape, (FILE)); \
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break; \
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} \
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} \
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\
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fprintf ((FILE), "\"\n"); \
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} \
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while (0)
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/* The routine used to output sequences of byte values. We use a special
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version of this for most svr4 targets because doing so makes the
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generated assembly code more compact (and thus faster to assemble)
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as well as more readable. Note that if we find subparts of the
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character sequence which end with NUL (and which are shorter than
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STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING. */
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425 |
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#undef ASM_OUTPUT_ASCII
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#define ASM_OUTPUT_ASCII(FILE, STR, LENGTH) \
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do \
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{ \
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register const unsigned char *_ascii_bytes = \
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(const unsigned char *) (STR); \
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register const unsigned char *limit = _ascii_bytes + (LENGTH); \
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register unsigned bytes_in_chunk = 0; \
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\
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for (; _ascii_bytes < limit; _ascii_bytes++) \
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{ \
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437 |
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register const unsigned char *p; \
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\
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if (bytes_in_chunk >= 60) \
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{ \
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441 |
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fprintf ((FILE), "\"\n"); \
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bytes_in_chunk = 0; \
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} \
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\
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for (p = _ascii_bytes; p < limit && *p != '\0'; p++) \
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continue; \
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\
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448 |
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if (p < limit && (p - _ascii_bytes) <= (long)STRING_LIMIT) \
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449 |
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{ \
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450 |
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if (bytes_in_chunk > 0) \
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451 |
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{ \
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452 |
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fprintf ((FILE), "\"\n"); \
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bytes_in_chunk = 0; \
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} \
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455 |
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\
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456 |
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ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes); \
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457 |
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_ascii_bytes = p; \
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458 |
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} \
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459 |
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else \
|
460 |
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{ \
|
461 |
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register int escape; \
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462 |
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|
register unsigned ch; \
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463 |
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\
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464 |
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if (bytes_in_chunk == 0) \
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465 |
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fprintf ((FILE), "%s\"", ASCII_DATA_ASM_OP); \
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466 |
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\
|
467 |
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switch (escape = ESCAPES[ch = *_ascii_bytes]) \
|
468 |
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{ \
|
469 |
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case 0: \
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470 |
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putc (ch, (FILE)); \
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471 |
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|
bytes_in_chunk++; \
|
472 |
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|
break; \
|
473 |
|
|
case 1: \
|
474 |
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|
fprintf ((FILE), "\\%03o", ch); \
|
475 |
|
|
bytes_in_chunk += 4; \
|
476 |
|
|
break; \
|
477 |
|
|
default: \
|
478 |
|
|
putc ('\\', (FILE)); \
|
479 |
|
|
putc (escape, (FILE)); \
|
480 |
|
|
bytes_in_chunk += 2; \
|
481 |
|
|
break; \
|
482 |
|
|
} \
|
483 |
|
|
} \
|
484 |
|
|
} \
|
485 |
|
|
\
|
486 |
|
|
if (bytes_in_chunk > 0) \
|
487 |
|
|
fprintf ((FILE), "\"\n"); \
|
488 |
|
|
} \
|
489 |
|
|
while (0)
|