477 lines
13 KiB
C
477 lines
13 KiB
C
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/* b.out object file format
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Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS 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
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published by the Free Software Foundation; either version 2,
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or (at your option) any later version.
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GAS is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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the GNU General Public License for more details.
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You should have received a copy of the GNU General Public
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License along with GAS; see the file COPYING. If not, write
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to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "as.h"
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#include "obstack.h"
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#ifndef NO_LISTING
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#include "aout/stab_gnu.h"
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#endif /* NO_LISTING */
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const short /* in: segT out: N_TYPE bits */
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seg_N_TYPE[] = {
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N_ABS,
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N_TEXT,
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N_DATA,
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N_BSS,
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N_UNDF, /* unknown */
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N_UNDF, /* absent */
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N_UNDF, /* pass1 */
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N_UNDF, /* error */
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N_UNDF, /* bignum/flonum */
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N_UNDF, /* difference */
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N_REGISTER, /* register */
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};
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const segT N_TYPE_seg[N_TYPE+2] = { /* N_TYPE == 0x1E = 32-2 */
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SEG_UNKNOWN, /* N_UNDF == 0 */
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SEG_GOOF,
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SEG_ABSOLUTE, /* N_ABS == 2 */
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SEG_GOOF,
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SEG_TEXT, /* N_TEXT == 4 */
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SEG_GOOF,
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SEG_DATA, /* N_DATA == 6 */
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SEG_GOOF,
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SEG_BSS, /* N_BSS == 8 */
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SEG_GOOF,
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SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF,
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SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF,
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SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF,
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SEG_REGISTER, /* dummy N_REGISTER for regs = 30 */
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SEG_GOOF,
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};
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#if __STDC__ == 1
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static void obj_bout_stab(int what);
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static void obj_bout_line(void);
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static void obj_bout_desc(void);
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#else /* not __STDC__ */
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static void obj_bout_desc();
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static void obj_bout_stab();
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static void obj_bout_line();
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#endif /* not __STDC__ */
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const pseudo_typeS obj_pseudo_table[] = {
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/* stabs (aka a.out aka b.out directives for debug symbols) */
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{ "desc", obj_bout_desc, 0 }, /* def */
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{ "line", obj_bout_line, 0 }, /* source code line number */
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{ "stabd", obj_bout_stab, 'd' }, /* stabs */
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{ "stabn", obj_bout_stab, 'n' }, /* stabs */
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{ "stabs", obj_bout_stab, 's' }, /* stabs */
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/* coff debugging directives. Currently ignored silently */
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{ "def", s_ignore, 0 },
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{ "dim", s_ignore, 0 },
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{ "endef", s_ignore, 0 },
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{ "ln", s_ignore, 0 },
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{ "scl", s_ignore, 0 },
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{ "size", s_ignore, 0 },
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{ "tag", s_ignore, 0 },
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{ "type", s_ignore, 0 },
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{ "val", s_ignore, 0 },
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/* other stuff we don't handle */
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{ "ABORT", s_ignore, 0 },
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{ "ident", s_ignore, 0 },
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{ NULL} /* end sentinel */
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}; /* obj_pseudo_table */
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/* Relocation. */
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/*
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* emit_relocations()
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*
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* Crawl along a fixS chain. Emit the segment's relocations.
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*/
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void obj_emit_relocations(where, fixP, segment_address_in_file)
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char **where;
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fixS *fixP; /* Fixup chain for this segment. */
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relax_addressT segment_address_in_file;
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{
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for (; fixP; fixP = fixP->fx_next) {
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if (fixP->fx_addsy != NULL) {
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tc_bout_fix_to_chars(*where, fixP, segment_address_in_file);
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*where += sizeof(struct relocation_info);
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} /* if there's a symbol */
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} /* for each fixup */
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} /* emit_relocations() */
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/* Aout file generation & utilities */
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/* Convert a lvalue to machine dependent data */
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void obj_header_append(where, headers)
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char **where;
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object_headers *headers;
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{
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/* Always leave in host byte order */
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headers->header.a_talign = section_alignment[SEG_TEXT];
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if (headers->header.a_talign < 2){
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headers->header.a_talign = 2;
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} /* force to at least 2 */
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headers->header.a_dalign = section_alignment[SEG_DATA];
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headers->header.a_balign = section_alignment[SEG_BSS];
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headers->header.a_tload = 0;
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headers->header.a_dload = md_section_align(SEG_DATA, H_GET_TEXT_SIZE(headers));
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append(where, (char *) &headers->header, sizeof(headers->header));
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} /* a_header_append() */
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void obj_symbol_to_chars(where, symbolP)
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char **where;
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symbolS *symbolP;
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{
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/* leave in host byte order */
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append(where, (char *)&symbolP->sy_symbol, sizeof(obj_symbol_type));
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} /* obj_symbol_to_chars() */
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void obj_emit_symbols(where, symbol_rootP)
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char **where;
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symbolS *symbol_rootP;
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{
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symbolS * symbolP;
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/*
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* Emit all symbols left in the symbol chain.
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*/
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for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next(symbolP)) {
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/* Used to save the offset of the name. It is used to point
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to the string in memory but must be a file offset. */
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char *temp;
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temp = S_GET_NAME(symbolP);
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S_SET_OFFSET(symbolP, symbolP->sy_name_offset);
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/* Any symbol still undefined and is not a dbg symbol is made N_EXT. */
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if (!S_IS_DEBUG(symbolP) && !S_IS_DEFINED(symbolP)) S_SET_EXTERNAL(symbolP);
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obj_symbol_to_chars(where, symbolP);
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S_SET_NAME(symbolP,temp);
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}
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} /* emit_symbols() */
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void obj_symbol_new_hook(symbolP)
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symbolS *symbolP;
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{
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S_SET_OTHER(symbolP, 0);
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S_SET_DESC(symbolP, 0);
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return;
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} /* obj_symbol_new_hook() */
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static void obj_bout_line() {
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/* Assume delimiter is part of expression. */
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/* BSD4.2 as fails with delightful bug, so we */
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/* are not being incompatible here. */
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new_logical_line ((char *)NULL, (int)(get_absolute_expression ()));
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demand_empty_rest_of_line();
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} /* obj_bout_line() */
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/*
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* stab()
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*
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* Handle .stabX directives, which used to be open-coded.
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* So much creeping featurism overloaded the semantics that we decided
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* to put all .stabX thinking in one place. Here.
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*
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* We try to make any .stabX directive legal. Other people's AS will often
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* do assembly-time consistency checks: eg assigning meaning to n_type bits
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* and "protecting" you from setting them to certain values. (They also zero
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* certain bits before emitting symbols. Tut tut.)
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*
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* If an expression is not absolute we either gripe or use the relocation
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* information. Other people's assemblers silently forget information they
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* don't need and invent information they need that you didn't supply.
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*
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* .stabX directives always make a symbol table entry. It may be junk if
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* the rest of your .stabX directive is malformed.
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*/
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static void obj_bout_stab(what)
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int what;
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{
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register symbolS * symbolP = 0;
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register char * string;
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int saved_type = 0;
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int length;
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int goof; /* TRUE if we have aborted. */
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long longint;
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/*
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* Enter with input_line_pointer pointing past .stabX and any following
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* whitespace.
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*/
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goof = 0; /* JF who forgot this?? */
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if (what == 's') {
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string = demand_copy_C_string(& length);
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SKIP_WHITESPACE();
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if (*input_line_pointer == ',')
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input_line_pointer ++;
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else {
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as_bad("I need a comma after symbol's name");
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goof = 1;
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}
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} else
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string = "";
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/*
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* Input_line_pointer->after ','. String->symbol name.
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*/
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if (!goof) {
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symbolP = symbol_new(string,
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SEG_UNKNOWN,
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0,
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(struct frag *)0);
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switch (what) {
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case 'd':
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S_SET_NAME(symbolP,NULL); /* .stabd feature. */
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S_SET_VALUE(symbolP,obstack_next_free(&frags) -
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frag_now->fr_literal);
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symbolP->sy_frag = frag_now;
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break;
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case 'n':
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symbolP->sy_frag = &zero_address_frag;
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break;
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case 's':
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symbolP->sy_frag = & zero_address_frag;
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break;
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default:
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BAD_CASE(what);
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break;
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}
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if (get_absolute_expression_and_terminator(& longint) == ',')
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symbolP->sy_symbol.n_type = saved_type = longint;
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else {
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as_bad("I want a comma after the n_type expression");
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goof = 1;
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input_line_pointer--; /* Backup over a non-',' char. */
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}
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}
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if (! goof) {
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if (get_absolute_expression_and_terminator (& longint) == ',')
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S_SET_OTHER(symbolP,longint);
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else {
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as_bad("I want a comma after the n_other expression");
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goof = 1;
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input_line_pointer--; /* Backup over a non-',' char. */
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}
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}
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if (! goof) {
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S_SET_DESC(symbolP, get_absolute_expression ());
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if (what == 's' || what == 'n') {
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if (* input_line_pointer != ',') {
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as_bad("I want a comma after the n_desc expression");
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goof = 1;
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} else {
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input_line_pointer ++;
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}
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}
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}
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if ((!goof) && (what == 's' || what == 'n')) {
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pseudo_set(symbolP);
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symbolP->sy_symbol.n_type = saved_type;
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}
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#ifndef NO_LISTING
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{
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extern int listing;
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if (listing && !goof) {
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if (symbolP->sy_symbol.n_type == N_SLINE) {
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listing_source_line(symbolP->sy_symbol.n_desc);
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} else if (symbolP->sy_symbol.n_type == N_SO
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|| symbolP->sy_symbol.n_type == N_SOL) {
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listing_source_file(string);
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}
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}
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}
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#endif
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if (goof)
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ignore_rest_of_line ();
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else
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demand_empty_rest_of_line ();
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} /* obj_bout_stab() */
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static void obj_bout_desc() {
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register char *name;
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register char c;
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register char *p;
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register symbolS * symbolP;
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register int temp;
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/*
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* Frob invented at RMS' request. Set the n_desc of a symbol.
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*/
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name = input_line_pointer;
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c = get_symbol_end();
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p = input_line_pointer;
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* p = c;
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SKIP_WHITESPACE();
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if (*input_line_pointer != ',') {
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*p = 0;
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as_bad("Expected comma after name \"%s\"", name);
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*p = c;
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ignore_rest_of_line();
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} else {
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input_line_pointer ++;
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temp = get_absolute_expression ();
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*p = 0;
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symbolP = symbol_find_or_make(name);
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*p = c;
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S_SET_DESC(symbolP,temp);
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}
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demand_empty_rest_of_line();
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} /* obj_bout_desc() */
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void obj_read_begin_hook() {
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return;
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} /* obj_read_begin_hook() */
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void obj_crawl_symbol_chain(headers)
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object_headers *headers;
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{
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symbolS **symbolPP;
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symbolS *symbolP;
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int symbol_number = 0;
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/* JF deal with forward references first... */
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for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next(symbolP)) {
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if (symbolP->sy_forward) {
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S_SET_VALUE(symbolP, S_GET_VALUE(symbolP)
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+ S_GET_VALUE(symbolP->sy_forward)
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+ symbolP->sy_forward->sy_frag->fr_address);
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symbolP->sy_forward=0;
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} /* if it has a forward reference */
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} /* walk the symbol chain */
|
||
|
|
|
||
|
|
tc_crawl_symbol_chain(headers);
|
||
|
|
|
||
|
|
symbolPP = & symbol_rootP; /*->last symbol chain link. */
|
||
|
|
while ((symbolP = *symbolPP) != NULL) {
|
||
|
|
if (flagseen['R'] && (S_GET_SEGMENT(symbolP) == SEG_DATA)) {
|
||
|
|
S_SET_SEGMENT(symbolP, SEG_TEXT);
|
||
|
|
} /* if pusing data into text */
|
||
|
|
|
||
|
|
S_SET_VALUE(symbolP, S_GET_VALUE(symbolP) + symbolP->sy_frag->fr_address);
|
||
|
|
|
||
|
|
/* 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' && (flagseen['L'] || ! 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);
|
||
|
|
|
||
|
|
return;
|
||
|
|
} /* obj_crawl_symbol_chain() */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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 */
|
||
|
|
|
||
|
|
return;
|
||
|
|
} /* obj_emit_strings() */
|
||
|
|
|
||
|
|
void obj_pre_write_hook(headers)
|
||
|
|
object_headers *headers;
|
||
|
|
{
|
||
|
|
H_SET_MAGIC_NUMBER(headers, BMAGIC);
|
||
|
|
H_SET_ENTRY_POINT(headers, 0);
|
||
|
|
|
||
|
|
return;
|
||
|
|
} /* obj_pre_write_hook() */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Local Variables:
|
||
|
|
* comment-column: 0
|
||
|
|
* fill-column: 131
|
||
|
|
* End:
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* end of obj-bout.c */
|