/* b.out object file format Copyright (C) 1989, 1990, 1991, 1992 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 2, 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "as.h" #include "obstack.h" const short /* in: segT out: N_TYPE bits */ seg_N_TYPE[] = { N_ABS, N_TEXT, N_DATA, N_BSS, N_UNDF, /* unknown */ N_UNDF, /* error */ N_UNDF, /* expression */ N_UNDF, /* debug */ N_UNDF, /* ntv */ N_UNDF, /* ptv */ N_REGISTER, /* register */ }; const segT N_TYPE_seg[N_TYPE + 2] = { /* N_TYPE == 0x1E = 32-2 */ SEG_UNKNOWN, /* N_UNDF == 0 */ SEG_GOOF, SEG_ABSOLUTE, /* N_ABS == 2 */ SEG_GOOF, SEG_TEXT, /* N_TEXT == 4 */ SEG_GOOF, SEG_DATA, /* N_DATA == 6 */ SEG_GOOF, SEG_BSS, /* N_BSS == 8 */ SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_REGISTER, /* dummy N_REGISTER for regs = 30 */ SEG_GOOF, }; static void obj_bout_line PARAMS ((int)); const pseudo_typeS obj_pseudo_table[] = { {"line", obj_bout_line, 0}, /* source code line number */ /* coff debugging directives. Currently ignored silently */ {"def", s_ignore, 0}, {"dim", s_ignore, 0}, {"endef", s_ignore, 0}, {"ln", s_ignore, 0}, {"scl", s_ignore, 0}, {"size", s_ignore, 0}, {"tag", s_ignore, 0}, {"type", s_ignore, 0}, {"val", s_ignore, 0}, /* other stuff we don't handle */ {"ABORT", s_ignore, 0}, {"ident", s_ignore, 0}, {NULL} /* end sentinel */ }; /* obj_pseudo_table */ /* Relocation. */ /* * emit_relocations() * * Crawl along a fixS chain. Emit the segment's relocations. */ void obj_emit_relocations (where, fixP, segment_address_in_file) char **where; fixS *fixP; /* Fixup chain for this segment. */ relax_addressT segment_address_in_file; { for (; fixP; fixP = fixP->fx_next) { if (fixP->fx_done == 0 || fixP->fx_r_type != NO_RELOC) { tc_bout_fix_to_chars (*where, fixP, segment_address_in_file); *where += sizeof (struct relocation_info); } /* if there's a symbol */ } /* for each fixup */ } /* emit_relocations() */ /* Aout file generation & utilities */ /* Convert a lvalue to machine dependent data */ void obj_header_append (where, headers) char **where; object_headers *headers; { /* Always leave in host byte order */ headers->header.a_talign = section_alignment[SEG_TEXT]; if (headers->header.a_talign < 2) { headers->header.a_talign = 2; } /* force to at least 2 */ headers->header.a_dalign = section_alignment[SEG_DATA]; headers->header.a_balign = section_alignment[SEG_BSS]; headers->header.a_tload = 0; headers->header.a_dload = md_section_align (SEG_DATA, H_GET_TEXT_SIZE (headers)); headers->header.a_relaxable = linkrelax; #ifdef CROSS_COMPILE md_number_to_chars (*where, headers->header.a_magic, sizeof (headers->header.a_magic)); *where += sizeof (headers->header.a_magic); md_number_to_chars (*where, headers->header.a_text, sizeof (headers->header.a_text)); *where += sizeof (headers->header.a_text); md_number_to_chars (*where, headers->header.a_data, sizeof (headers->header.a_data)); *where += sizeof (headers->header.a_data); md_number_to_chars (*where, headers->header.a_bss, sizeof (headers->header.a_bss)); *where += sizeof (headers->header.a_bss); md_number_to_chars (*where, headers->header.a_syms, sizeof (headers->header.a_syms)); *where += sizeof (headers->header.a_syms); md_number_to_chars (*where, headers->header.a_entry, sizeof (headers->header.a_entry)); *where += sizeof (headers->header.a_entry); md_number_to_chars (*where, headers->header.a_trsize, sizeof (headers->header.a_trsize)); *where += sizeof (headers->header.a_trsize); md_number_to_chars (*where, headers->header.a_drsize, sizeof (headers->header.a_drsize)); *where += sizeof (headers->header.a_drsize); md_number_to_chars (*where, headers->header.a_tload, sizeof (headers->header.a_tload)); *where += sizeof (headers->header.a_tload); md_number_to_chars (*where, headers->header.a_dload, sizeof (headers->header.a_dload)); *where += sizeof (headers->header.a_dload); md_number_to_chars (*where, headers->header.a_talign, sizeof (headers->header.a_talign)); *where += sizeof (headers->header.a_talign); md_number_to_chars (*where, headers->header.a_dalign, sizeof (headers->header.a_dalign)); *where += sizeof (headers->header.a_dalign); md_number_to_chars (*where, headers->header.a_balign, sizeof (headers->header.a_balign)); *where += sizeof (headers->header.a_balign); md_number_to_chars (*where, headers->header.a_relaxable, sizeof (headers->header.a_relaxable)); *where += sizeof (headers->header.a_relaxable); #else /* ! CROSS_COMPILE */ append (where, (char *) &headers->header, sizeof (headers->header)); #endif /* ! CROSS_COMPILE */ } /* a_header_append() */ void obj_symbol_to_chars (where, symbolP) char **where; symbolS *symbolP; { md_number_to_chars ((char *) &(S_GET_OFFSET (symbolP)), S_GET_OFFSET (symbolP), sizeof (S_GET_OFFSET (symbolP))); md_number_to_chars ((char *) &(S_GET_DESC (symbolP)), S_GET_DESC (symbolP), sizeof (S_GET_DESC (symbolP))); md_number_to_chars ((char *) &symbolP->sy_symbol.n_value, S_GET_VALUE (symbolP), sizeof (symbolP->sy_symbol.n_value)); append (where, (char *) &symbolP->sy_symbol, sizeof (obj_symbol_type)); } /* obj_symbol_to_chars() */ void obj_emit_symbols (where, symbol_rootP) char **where; symbolS *symbol_rootP; { symbolS *symbolP; /* * Emit all symbols left in the symbol chain. */ for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next (symbolP)) { /* Used to save the offset of the name. It is used to point to the string in memory but must be a file offset. */ char *temp; temp = S_GET_NAME (symbolP); S_SET_OFFSET (symbolP, symbolP->sy_name_offset); /* Any symbol still undefined and is not a dbg symbol is made N_EXT. */ if (!S_IS_DEBUG (symbolP) && !S_IS_DEFINED (symbolP)) S_SET_EXTERNAL (symbolP); obj_symbol_to_chars (where, symbolP); S_SET_NAME (symbolP, temp); } } /* emit_symbols() */ void obj_symbol_new_hook (symbolP) symbolS *symbolP; { S_SET_OTHER (symbolP, 0); S_SET_DESC (symbolP, 0); } static void obj_bout_line (ignore) int ignore; { /* Assume delimiter is part of expression. */ /* BSD4.2 as fails with delightful bug, so we */ /* are not being incompatible here. */ new_logical_line ((char *) NULL, (int) (get_absolute_expression ())); demand_empty_rest_of_line (); } /* obj_bout_line() */ void obj_read_begin_hook () { } void obj_crawl_symbol_chain (headers) object_headers *headers; { symbolS **symbolPP; symbolS *symbolP; int symbol_number = 0; tc_crawl_symbol_chain (headers); symbolPP = &symbol_rootP; /*->last symbol chain link. */ while ((symbolP = *symbolPP) != NULL) { if (flag_readonly_data_in_text && (S_GET_SEGMENT (symbolP) == SEG_DATA)) { S_SET_SEGMENT (symbolP, SEG_TEXT); } /* if pusing data into text */ resolve_symbol_value (symbolP); /* OK, here is how we decide which symbols go out into the brave new symtab. Symbols that do are: * symbols with no name (stabd's?) * symbols with debug info in their N_TYPE Symbols that don't are: * symbols that are registers * symbols with \1 as their 3rd character (numeric labels) * "local labels" as defined by S_LOCAL_NAME(name) if the -L switch was passed to gas. All other symbols are output. We complain if a deleted symbol was marked external. */ if (1 && !S_IS_REGISTER (symbolP) && (!S_GET_NAME (symbolP) || S_IS_DEBUG (symbolP) #ifdef TC_I960 /* FIXME-SOON this ifdef seems highly dubious to me. xoxorich. */ || !S_IS_DEFINED (symbolP) || S_IS_EXTERNAL (symbolP) #endif /* TC_I960 */ || (S_GET_NAME (symbolP)[0] != '\001' && (flag_keep_locals || !S_LOCAL_NAME (symbolP))))) { symbolP->sy_number = symbol_number++; /* The + 1 after strlen account for the \0 at the end of each string */ if (!S_IS_STABD (symbolP)) { /* Ordinary case. */ symbolP->sy_name_offset = string_byte_count; string_byte_count += strlen (S_GET_NAME (symbolP)) + 1; } else /* .Stabd case. */ symbolP->sy_name_offset = 0; symbolPP = &(symbol_next (symbolP)); } else { if (S_IS_EXTERNAL (symbolP) || !S_IS_DEFINED (symbolP)) { as_bad ("Local symbol %s never defined", S_GET_NAME (symbolP)); } /* oops. */ /* Unhook it from the chain */ *symbolPP = symbol_next (symbolP); } /* if this symbol should be in the output */ } /* for each symbol */ H_SET_SYMBOL_TABLE_SIZE (headers, symbol_number); } /* * Find strings by crawling along symbol table chain. */ void obj_emit_strings (where) char **where; { symbolS *symbolP; #ifdef CROSS_COMPILE /* Gotta do md_ byte-ordering stuff for string_byte_count first - KWK */ md_number_to_chars (*where, string_byte_count, sizeof (string_byte_count)); *where += sizeof (string_byte_count); #else /* CROSS_COMPILE */ append (where, (char *) &string_byte_count, (unsigned long) sizeof (string_byte_count)); #endif /* CROSS_COMPILE */ for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next (symbolP)) { if (S_GET_NAME (symbolP)) append (where, S_GET_NAME (symbolP), (unsigned long) (strlen (S_GET_NAME (symbolP)) + 1)); } /* walk symbol chain */ } /* end of obj-bout.c */