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/* tc-moxie.c -- Assemble code for moxie Copyright 2009 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. */ /* Contributed by Anthony Green <green@moxielogic.com>. */ #include "as.h" #include "safe-ctype.h" #include "opcode/moxie.h" #include "elf/moxie.h" extern const moxie_opc_info_t moxie_opc_info[128]; const char comment_chars[] = "#"; const char line_separator_chars[] = ";"; const char line_comment_chars[] = "#"; static int pending_reloc; static struct hash_control *opcode_hash_control; const pseudo_typeS md_pseudo_table[] = { {0, 0, 0} }; const char FLT_CHARS[] = "rRsSfFdDxXpP"; const char EXP_CHARS[] = "eE"; static int md_chars_to_number (char *val, int n); void md_operand (expressionS *op __attribute__((unused))) { /* Empty for now. */ } /* This function is called once, at assembler startup time. It sets up the hash table with all the opcodes in it, and also initializes some aliases for compatibility with other assemblers. */ void md_begin (void) { int count; const moxie_opc_info_t *opcode; opcode_hash_control = hash_new (); /* Insert names into hash table. */ for (count = 0, opcode = moxie_form1_opc_info; count++ < 64; opcode++) hash_insert (opcode_hash_control, opcode->name, (char *) opcode); for (count = 0, opcode = moxie_form2_opc_info; count++ < 4; opcode++) hash_insert (opcode_hash_control, opcode->name, (char *) opcode); for (count = 0, opcode = moxie_form3_opc_info; count++ < 10; opcode++) hash_insert (opcode_hash_control, opcode->name, (char *) opcode); bfd_set_arch_mach (stdoutput, TARGET_ARCH, 0); } /* Parse an expression and then restore the input line pointer. */ static char * parse_exp_save_ilp (char *s, expressionS *op) { char *save = input_line_pointer; input_line_pointer = s; expression (op); s = input_line_pointer; input_line_pointer = save; return s; } static int parse_register_operand (char **ptr) { int reg; char *s = *ptr; if (*s != '$') { as_bad (_("expecting register")); ignore_rest_of_line (); return -1; } if (s[1] == 'f' && s[2] == 'p') { *ptr += 3; return 0; } if (s[1] == 's' && s[2] == 'p') { *ptr += 3; return 1; } if (s[1] == 'r') { reg = s[2] - '0'; if ((reg < 0) || (reg > 9)) { as_bad (_("illegal register number")); ignore_rest_of_line (); return -1; } if (reg == 1) { int r2 = s[3] - '0'; if ((r2 >= 0) && (r2 <= 3)) { reg = 10 + r2; *ptr += 1; } } } else { as_bad (_("illegal register number")); ignore_rest_of_line (); return -1; } *ptr += 3; return reg + 2; } /* This is the guts of the machine-dependent assembler. STR points to a machine dependent instruction. This function is supposed to emit the frags/bytes it assembles to. */ void md_assemble (char *str) { char *op_start; char *op_end; moxie_opc_info_t *opcode; char *p; char pend; unsigned short iword = 0; int nlen = 0; /* Drop leading whitespace. */ while (*str == ' ') str++; /* Find the op code end. */ op_start = str; for (op_end = str; *op_end && !is_end_of_line[*op_end & 0xff] && *op_end != ' '; op_end++) nlen++; pend = *op_end; *op_end = 0; if (nlen == 0) as_bad (_("can't find opcode ")); opcode = (moxie_opc_info_t *) hash_find (opcode_hash_control, op_start); *op_end = pend; if (opcode == NULL) { as_bad (_("unknown opcode %s"), op_start); return; } p = frag_more (2); switch (opcode->itype) { case MOXIE_F2_A8V: iword = (1<<15) | (opcode->opcode << 12); while (ISSPACE (*op_end)) op_end++; { expressionS arg; int reg; reg = parse_register_operand (&op_end); iword += (reg << 8); if (*op_end != ',') as_warn (_("expecting comma delimited register operands")); op_end++; op_end = parse_exp_save_ilp (op_end, &arg); fix_new_exp (frag_now, ((p+1) - frag_now->fr_literal), 1, &arg, 0, BFD_RELOC_8); } break; case MOXIE_F1_AB: iword = opcode->opcode << 8; while (ISSPACE (*op_end)) op_end++; { int dest, src; dest = parse_register_operand (&op_end); if (*op_end != ',') as_warn (_("expecting comma delimited register operands")); op_end++; src = parse_register_operand (&op_end); iword += (dest << 4) + src; while (ISSPACE (*op_end)) op_end++; if (*op_end != 0) as_warn (_("extra stuff on line ignored")); } break; case MOXIE_F1_A4: iword = opcode->opcode << 8; while (ISSPACE (*op_end)) op_end++; { expressionS arg; char *where; int regnum; regnum = parse_register_operand (&op_end); while (ISSPACE (*op_end)) op_end++; iword += (regnum << 4); if (*op_end != ',') { as_bad (_("expecting comma delimited operands")); ignore_rest_of_line (); return; } op_end++; op_end = parse_exp_save_ilp (op_end, &arg); where = frag_more (4); fix_new_exp (frag_now, (where - frag_now->fr_literal), 4, &arg, 0, BFD_RELOC_32); } break; case MOXIE_F1_M: case MOXIE_F1_4: iword = opcode->opcode << 8; while (ISSPACE (*op_end)) op_end++; { expressionS arg; char *where; op_end = parse_exp_save_ilp (op_end, &arg); where = frag_more (4); fix_new_exp (frag_now, (where - frag_now->fr_literal), 4, &arg, 0, BFD_RELOC_32); } break; case MOXIE_F1_NARG: iword = opcode->opcode << 8; while (ISSPACE (*op_end)) op_end++; if (*op_end != 0) as_warn (_("extra stuff on line ignored")); break; case MOXIE_F1_A: iword = opcode->opcode << 8; while (ISSPACE (*op_end)) op_end++; { int reg; reg = parse_register_operand (&op_end); while (ISSPACE (*op_end)) op_end++; if (*op_end != 0) as_warn (_("extra stuff on line ignored")); iword += (reg << 4); } break; case MOXIE_F1_ABi: iword = opcode->opcode << 8; while (ISSPACE (*op_end)) op_end++; { int a, b; a = parse_register_operand (&op_end); if (*op_end != ',') as_warn (_("expecting comma delimited register operands")); op_end++; if (*op_end != '(') { as_bad (_("expecting indirect register `($rA)'")); ignore_rest_of_line (); return; } op_end++; b = parse_register_operand (&op_end); if (*op_end != ')') { as_bad (_("missing closing parenthesis")); ignore_rest_of_line (); return; } op_end++; iword += (a << 4) + b; while (ISSPACE (*op_end)) op_end++; if (*op_end != 0) as_warn (_("extra stuff on line ignored")); } break; case MOXIE_F1_AiB: iword = opcode->opcode << 8; while (ISSPACE (*op_end)) op_end++; { int a, b; if (*op_end != '(') { as_bad (_("expecting indirect register `($rA)'")); ignore_rest_of_line (); return; } op_end++; a = parse_register_operand (&op_end); if (*op_end != ')') { as_bad (_("missing closing parenthesis")); ignore_rest_of_line (); return; } op_end++; if (*op_end != ',') as_warn (_("expecting comma delimited register operands")); op_end++; b = parse_register_operand (&op_end); iword += (a << 4) + b; while (ISSPACE (*op_end)) op_end++; if (*op_end != 0) as_warn (_("extra stuff on line ignored")); } break; case MOXIE_F1_4A: iword = opcode->opcode << 8; while (ISSPACE (*op_end)) op_end++; { expressionS arg; char *where; int a; op_end = parse_exp_save_ilp (op_end, &arg); where = frag_more (4); fix_new_exp (frag_now, (where - frag_now->fr_literal), 4, &arg, 0, BFD_RELOC_32); if (*op_end != ',') { as_bad (_("expecting comma delimited operands")); ignore_rest_of_line (); return; } op_end++; a = parse_register_operand (&op_end); while (ISSPACE (*op_end)) op_end++; if (*op_end != 0) as_warn (_("extra stuff on line ignored")); iword += (a << 4); } break; case MOXIE_F1_ABi4: iword = opcode->opcode << 8; while (ISSPACE (*op_end)) op_end++; { expressionS arg; char *offset; int a, b; a = parse_register_operand (&op_end); while (ISSPACE (*op_end)) op_end++; if (*op_end != ',') { as_bad (_("expecting comma delimited operands")); ignore_rest_of_line (); return; } op_end++; op_end = parse_exp_save_ilp (op_end, &arg); offset = frag_more (4); fix_new_exp (frag_now, (offset - frag_now->fr_literal), 4, &arg, 0, BFD_RELOC_32); if (*op_end != '(') { as_bad (_("expecting indirect register `($rX)'")); ignore_rest_of_line (); return; } op_end++; b = parse_register_operand (&op_end); if (*op_end != ')') { as_bad (_("missing closing parenthesis")); ignore_rest_of_line (); return; } op_end++; while (ISSPACE (*op_end)) op_end++; if (*op_end != 0) as_warn (_("extra stuff on line ignored")); iword += (a << 4) + b; } break; case MOXIE_F1_AiB4: iword = opcode->opcode << 8; while (ISSPACE (*op_end)) op_end++; { expressionS arg; char *offset; int a, b; op_end = parse_exp_save_ilp (op_end, &arg); offset = frag_more (4); fix_new_exp (frag_now, (offset - frag_now->fr_literal), 4, &arg, 0, BFD_RELOC_32); if (*op_end != '(') { as_bad (_("expecting indirect register `($rX)'")); ignore_rest_of_line (); return; } op_end++; a = parse_register_operand (&op_end); if (*op_end != ')') { as_bad (_("missing closing parenthesis")); ignore_rest_of_line (); return; } op_end++; if (*op_end != ',') { as_bad (_("expecting comma delimited operands")); ignore_rest_of_line (); return; } op_end++; b = parse_register_operand (&op_end); while (ISSPACE (*op_end)) op_end++; while (ISSPACE (*op_end)) op_end++; if (*op_end != 0) as_warn (_("extra stuff on line ignored")); iword += (a << 4) + b; } break; case MOXIE_F2_NARG: iword = opcode->opcode << 12; while (ISSPACE (*op_end)) op_end++; if (*op_end != 0) as_warn (_("extra stuff on line ignored")); break; case MOXIE_F3_PCREL: iword = (3<<14) | (opcode->opcode << 10); while (ISSPACE (*op_end)) op_end++; { expressionS arg; op_end = parse_exp_save_ilp (op_end, &arg); fix_new_exp (frag_now, (p - frag_now->fr_literal), 2, &arg, TRUE, BFD_RELOC_MOXIE_10_PCREL); } break; default: abort (); } md_number_to_chars (p, iword, 2); while (ISSPACE (*op_end)) op_end++; if (*op_end != 0) as_warn (_("extra stuff on line ignored")); if (pending_reloc) as_bad (_("Something forgot to clean up\n")); } /* Turn a string in input_line_pointer into a floating point constant of type type, and store the appropriate bytes in *LITP. The number of LITTLENUMS emitted is stored in *SIZEP . An error message is returned, or NULL on OK. */ char * md_atof (int type, char *litP, int *sizeP) { int prec; LITTLENUM_TYPE words[4]; char *t; int i; switch (type) { case 'f': prec = 2; break; case 'd': prec = 4; break; default: *sizeP = 0; return _("bad call to md_atof"); } t = atof_ieee (input_line_pointer, type, words); if (t) input_line_pointer = t; *sizeP = prec * 2; for (i = prec - 1; i >= 0; i--) { md_number_to_chars (litP, (valueT) words[i], 2); litP += 2; } return NULL; } const char *md_shortopts = ""; struct option md_longopts[] = { {NULL, no_argument, NULL, 0} }; size_t md_longopts_size = sizeof (md_longopts); /* We have no target specific options yet, so these next two functions are empty. */ int md_parse_option (int c ATTRIBUTE_UNUSED, char *arg ATTRIBUTE_UNUSED) { return 0; } void md_show_usage (FILE *stream ATTRIBUTE_UNUSED) { } /* Apply a fixup to the object file. */ void md_apply_fix (fixS *fixP ATTRIBUTE_UNUSED, valueT * valP ATTRIBUTE_UNUSED, segT seg ATTRIBUTE_UNUSED) { char *buf = fixP->fx_where + fixP->fx_frag->fr_literal; long val = *valP; long newval; long max, min; max = min = 0; switch (fixP->fx_r_type) { case BFD_RELOC_32: *buf++ = val >> 24; *buf++ = val >> 16; *buf++ = val >> 8; *buf++ = val >> 0; break; case BFD_RELOC_16: *buf++ = val >> 8; *buf++ = val >> 0; break; case BFD_RELOC_8: *buf++ = val; break; case BFD_RELOC_MOXIE_10_PCREL: if (!val) break; if (val < -1024 || val > 1022) as_bad_where (fixP->fx_file, fixP->fx_line, _("pcrel too far BFD_RELOC_MOXIE_10")); /* 11 bit offset even numbered, so we remove right bit. */ val >>= 1; newval = md_chars_to_number (buf, 2); newval |= val & 0x03ff; md_number_to_chars (buf, newval, 2); break; default: abort (); } if (max != 0 && (val < min || val > max)) as_bad_where (fixP->fx_file, fixP->fx_line, _("offset out of range")); if (fixP->fx_addsy == NULL && fixP->fx_pcrel == 0) fixP->fx_done = 1; } /* Put number into target byte order (big endian). */ void md_number_to_chars (char *ptr, valueT use, int nbytes) { number_to_chars_bigendian (ptr, use, nbytes); } /* Convert from target byte order to host byte order. */ static int md_chars_to_number (char *val, int n) { int retval = 0; while (n--) { retval <<= 8; retval |= (*val++ & 255); } return retval; } /* Generate a machine-dependent relocation. */ arelent * tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixP) { arelent *relP; bfd_reloc_code_real_type code; switch (fixP->fx_r_type) { case BFD_RELOC_32: code = fixP->fx_r_type; break; case BFD_RELOC_MOXIE_10_PCREL: code = fixP->fx_r_type; break; default: as_bad_where (fixP->fx_file, fixP->fx_line, _("Semantics error. This type of operand can not be relocated, it must be an assembly-time constant")); return 0; } relP = xmalloc (sizeof (arelent)); gas_assert (relP != 0); relP->sym_ptr_ptr = xmalloc (sizeof (asymbol *)); *relP->sym_ptr_ptr = symbol_get_bfdsym (fixP->fx_addsy); relP->address = fixP->fx_frag->fr_address + fixP->fx_where; relP->addend = fixP->fx_offset; /* This is the standard place for KLUDGEs to work around bugs in bfd_install_relocation (first such note in the documentation appears with binutils-2.8). That function bfd_install_relocation does the wrong thing with putting stuff into the addend of a reloc (it should stay out) for a weak symbol. The really bad thing is that it adds the "segment-relative offset" of the symbol into the reloc. In this case, the reloc should instead be relative to the symbol with no other offset than the assembly code shows; and since the symbol is weak, any local definition should be ignored until link time (or thereafter). To wit: weaksym+42 should be weaksym+42 in the reloc, not weaksym+(offset_from_segment_of_local_weaksym_definition) To "work around" this, we subtract the segment-relative offset of "known" weak symbols. This evens out the extra offset. That happens for a.out but not for ELF, since for ELF, bfd_install_relocation uses the "special function" field of the howto, and does not execute the code that needs to be undone. */ if (OUTPUT_FLAVOR == bfd_target_aout_flavour && fixP->fx_addsy && S_IS_WEAK (fixP->fx_addsy) && ! bfd_is_und_section (S_GET_SEGMENT (fixP->fx_addsy))) { relP->addend -= S_GET_VALUE (fixP->fx_addsy); } relP->howto = bfd_reloc_type_lookup (stdoutput, code); if (! relP->howto) { const char *name; name = S_GET_NAME (fixP->fx_addsy); if (name == NULL) name = _("<unknown>"); as_fatal (_("Cannot generate relocation type for symbol %s, code %s"), name, bfd_get_reloc_code_name (code)); } return relP; } /* Decide from what point a pc-relative relocation is relative to, relative to the pc-relative fixup. Er, relatively speaking. */ long md_pcrel_from (fixS *fixP) { valueT addr = fixP->fx_where + fixP->fx_frag->fr_address; switch (fixP->fx_r_type) { case BFD_RELOC_32: return addr + 4; case BFD_RELOC_MOXIE_10_PCREL: return addr; default: abort (); return addr; } }