| /* b.out object file format |
| Copyright (C) 1989, 90, 91, 92, 93, 94, 95, 1996 |
| 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) |
| { |
| symbolS *sym; |
| |
| sym = fixP->fx_addsy; |
| while (sym->sy_value.X_op == O_symbol |
| && (! S_IS_DEFINED (sym) || S_IS_COMMON (sym))) |
| sym = sym->sy_value.X_add_symbol; |
| fixP->fx_addsy = sym; |
| |
| 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, 1); |
| |
| /* Skip symbols which were equated to undefined or common |
| symbols. */ |
| if (symbolP->sy_value.X_op == O_symbol |
| && (! S_IS_DEFINED (symbolP) || S_IS_COMMON (symbolP))) |
| { |
| *symbolPP = symbol_next (symbolP); |
| continue; |
| } |
| |
| /* 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 */ |