aboutsummaryrefslogtreecommitdiff
path: root/gas/config/obj-aout.c
diff options
context:
space:
mode:
Diffstat (limited to 'gas/config/obj-aout.c')
-rw-r--r--gas/config/obj-aout.c500
1 files changed, 500 insertions, 0 deletions
diff --git a/gas/config/obj-aout.c b/gas/config/obj-aout.c
new file mode 100644
index 0000000..6c1e100
--- /dev/null
+++ b/gas/config/obj-aout.c
@@ -0,0 +1,500 @@
+/* a.out object file format
+ Copyright (C) 1989, 1990, 1991 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 1,
+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, 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+/* $Id$ */
+
+#include "as.h"
+
+#include "obstack.h"
+
+ /* in: segT out: N_TYPE bits */
+const short seg_N_TYPE[] = {
+ N_ABS,
+ N_TEXT,
+ N_DATA,
+ N_BSS,
+ N_UNDF, /* unknown */
+ N_UNDF, /* absent */
+ N_UNDF, /* pass1 */
+ N_UNDF, /* error */
+ N_UNDF, /* bignum/flonum */
+ N_UNDF, /* difference */
+ 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,
+};
+
+#ifdef __STDC__
+static void obj_aout_stab(int what);
+static void obj_aout_line(void);
+static void obj_aout_desc(void);
+#else /* __STDC__ */
+static void obj_aout_desc();
+static void obj_aout_stab();
+static void obj_aout_line();
+#endif /* __STDC__ */
+
+const pseudo_typeS obj_pseudo_table[] = {
+ { "line", obj_aout_line, 0 }, /* source code line number */
+ { "ln", obj_aout_line, 0 }, /* source code line number */
+ { "desc", obj_aout_desc, 0 }, /* def */
+ { "stabd", obj_aout_stab, 'd' }, /* stabs */
+ { "stabn", obj_aout_stab, 'n' }, /* stabs */
+ { "stabs", obj_aout_stab, 's' }, /* stabs */
+
+ { NULL} /* end sentinel */
+}; /* obj_pseudo_table */
+
+
+/* Relocation. */
+
+/*
+ * In: length of relocation (or of address) in chars: 1, 2 or 4.
+ * Out: GNU LD relocation length code: 0, 1, or 2.
+ */
+
+static unsigned char
+nbytes_r_length [] = {
+ 42, 0, 1, 42, 2
+ };
+
+/*
+ * 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;
+{
+ struct reloc_info_generic ri;
+ register symbolS *symbolP;
+
+ /* If a machine dependent emitter is needed, call it instead. */
+ if (md_emit_relocations) {
+ (*md_emit_relocations) (fixP, segment_address_in_file);
+ return;
+ }
+
+ /* JF this is for paranoia */
+ bzero((char *)&ri,sizeof(ri));
+ for (; fixP; fixP = fixP->fx_next) {
+ if ((symbolP = fixP->fx_addsy) != 0) {
+ ri.r_bsr = fixP->fx_bsr;
+ ri.r_disp = fixP->fx_im_disp;
+ ri.r_callj = fixP->fx_callj;
+ ri.r_length = nbytes_r_length [fixP->fx_size];
+ ri.r_pcrel = fixP->fx_pcrel;
+ ri.r_address = fixP->fx_frag->fr_address + fixP->fx_where - segment_address_in_file;
+
+ if (S_GET_TYPE(symbolP) == N_UNDF) {
+ ri.r_extern = 1;
+ ri.r_symbolnum = symbolP->sy_number;
+ } else {
+ ri.r_extern = 0;
+ ri.r_symbolnum = S_GET_TYPE(symbolP);
+ }
+
+ /* Output the relocation information in machine-dependent form. */
+ md_ri_to_chars(*where, &ri);
+ *where += md_reloc_size;
+ } /* if there is an add symbol */
+ } /* for each fix */
+
+ return;
+} /* emit_relocations() */
+
+/* Aout file generation & utilities */
+void obj_header_append(where, headers)
+char **where;
+object_headers *headers;
+{
+ tc_headers_hook(headers);
+
+#ifdef CROSS_ASSEMBLE
+ md_number_to_chars(*where, headers->header.a_info, sizeof(headers->header.a_info));
+ *where += sizeof(headers->header.a_info);
+ 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);
+#ifdef EXEC_MACHINE_TYPE
+ md_number_to_chars(*where, headers->header.a_machtype, sizeof(headers->header.a_machtype));
+ *where += sizeof(headers->header.a_machtype);
+#endif /* EXEC_MACHINE_TYPE */
+#ifdef EXEC_VERSION
+ md_number_to_chars(*where, headers->header.a_version, sizeof(headers->header.a_version));
+ *where += sizeof(headers->header.a_version);
+#endif /* EXEC_VERSION */
+
+#else /* CROSS_ASSEMBLE */
+
+ append(where, (char *) &headers->header, sizeof(headers->header));
+#endif /* CROSS_ASSEMBLE */
+
+ return;
+} /* obj_append_header() */
+
+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 *)&(S_GET_VALUE(symbolP)), S_GET_VALUE(symbolP), sizeof(S_GET_VALUE(symbolP)));
+
+ 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. */
+ register 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);
+ return;
+} /* obj_symbol_new_hook() */
+
+static void obj_aout_line() {
+ /* 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_aout_line() */
+
+/*
+ * stab()
+ *
+ * Handle .stabX directives, which used to be open-coded.
+ * So much creeping featurism overloaded the semantics that we decided
+ * to put all .stabX thinking in one place. Here.
+ *
+ * We try to make any .stabX directive legal. Other people's AS will often
+ * do assembly-time consistency checks: eg assigning meaning to n_type bits
+ * and "protecting" you from setting them to certain values. (They also zero
+ * certain bits before emitting symbols. Tut tut.)
+ *
+ * If an expression is not absolute we either gripe or use the relocation
+ * information. Other people's assemblers silently forget information they
+ * don't need and invent information they need that you didn't supply.
+ *
+ * .stabX directives always make a symbol table entry. It may be junk if
+ * the rest of your .stabX directive is malformed.
+ */
+static void obj_aout_stab(what)
+int what;
+{
+ register symbolS * symbolP = 0;
+ register char * string;
+ int saved_type = 0;
+ int length;
+ int goof; /* TRUE if we have aborted. */
+ long longint;
+
+/*
+ * Enter with input_line_pointer pointing past .stabX and any following
+ * whitespace.
+ */
+ goof = 0; /* JF who forgot this?? */
+ if (what == 's') {
+ string = demand_copy_C_string(& length);
+ SKIP_WHITESPACE();
+ if (* input_line_pointer == ',')
+ input_line_pointer ++;
+ else {
+ as_bad("I need a comma after symbol's name");
+ goof = 1;
+ }
+ } else
+ string = "";
+
+/*
+ * Input_line_pointer->after ','. String->symbol name.
+ */
+ if (! goof) {
+ symbolP = symbol_new(string,
+ SEG_UNKNOWN,
+ 0,
+ (struct frag *)0);
+ switch (what) {
+ case 'd':
+ S_SET_NAME(symbolP, NULL); /* .stabd feature. */
+ S_SET_VALUE(symbolP, obstack_next_free(&frags) - frag_now->fr_literal);
+ symbolP->sy_frag = frag_now;
+ break;
+
+ case 'n':
+ symbolP->sy_frag = &zero_address_frag;
+ break;
+
+ case 's':
+ symbolP->sy_frag = & zero_address_frag;
+ break;
+
+ default:
+ BAD_CASE(what);
+ break;
+ }
+
+ if (get_absolute_expression_and_terminator(&longint) == ',')
+ symbolP->sy_symbol.n_type = saved_type = longint;
+ else {
+ as_bad("I want a comma after the n_type expression");
+ goof = 1;
+ input_line_pointer --; /* Backup over a non-',' char. */
+ }
+ }
+
+ if (!goof) {
+ if (get_absolute_expression_and_terminator(&longint) == ',')
+ S_SET_OTHER(symbolP, longint);
+ else {
+ as_bad("I want a comma after the n_other expression");
+ goof = 1;
+ input_line_pointer--; /* Backup over a non-',' char. */
+ }
+ }
+
+ if (!goof) {
+ S_SET_DESC(symbolP, get_absolute_expression());
+ if (what == 's' || what == 'n') {
+ if (*input_line_pointer != ',') {
+ as_bad("I want a comma after the n_desc expression");
+ goof = 1;
+ } else {
+ input_line_pointer++;
+ }
+ }
+ }
+
+ if ((!goof) && (what=='s' || what=='n')) {
+ pseudo_set(symbolP);
+ symbolP->sy_symbol.n_type = saved_type;
+ }
+
+ if (goof)
+ ignore_rest_of_line();
+ else
+ demand_empty_rest_of_line ();
+} /* obj_aout_stab() */
+
+static void obj_aout_desc() {
+ register char *name;
+ register char c;
+ register char *p;
+ register symbolS *symbolP;
+ register int temp;
+
+ /*
+ * Frob invented at RMS' request. Set the n_desc of a symbol.
+ */
+ name = input_line_pointer;
+ c = get_symbol_end();
+ p = input_line_pointer;
+ * p = c;
+ SKIP_WHITESPACE();
+ if (*input_line_pointer != ',') {
+ *p = 0;
+ as_bad("Expected comma after name \"%s\"", name);
+ *p = c;
+ ignore_rest_of_line();
+ } else {
+ input_line_pointer ++;
+ temp = get_absolute_expression();
+ *p = 0;
+ symbolP = symbol_find_or_make(name);
+ *p = c;
+ S_SET_DESC(symbolP,temp);
+ }
+ demand_empty_rest_of_line();
+} /* obj_aout_desc() */
+
+void obj_read_begin_hook() {
+ return;
+} /* obj_read_begin_hook() */
+
+void obj_crawl_symbol_chain(headers)
+object_headers *headers;
+{
+ symbolS *symbolP;
+ symbolS **symbolPP;
+ int symbol_number = 0;
+
+ /* JF deal with forward references first... */
+ for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next(symbolP)) {
+ if (symbolP->sy_forward) {
+ S_SET_VALUE(symbolP, S_GET_VALUE(symbolP)
+ + S_GET_VALUE(symbolP->sy_forward)
+ + symbolP->sy_forward->sy_frag->fr_address);
+
+ symbolP->sy_forward=0;
+ } /* if it has a forward reference */
+ } /* 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 (!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_ASSEMBLE
+ /* 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_ASSEMBLE */
+ append (where, (char *)&string_byte_count, (unsigned long)sizeof(string_byte_count));
+#endif /* CROSS_ASSEMBLE */
+
+ for(symbolP = symbol_rootP; symbolP; symbolP = symbol_next(symbolP)) {
+ if(S_GET_NAME(symbolP))
+ append(&next_object_file_charP, S_GET_NAME(symbolP),
+ (unsigned long)(strlen (S_GET_NAME(symbolP)) + 1));
+ } /* walk symbol chain */
+
+ return;
+} /* obj_emit_strings() */
+
+/*
+ * Local Variables:
+ * comment-column: 0
+ * fill-column: 131
+ * End:
+ */
+
+/* end of obj-aout.c */
generated by cgit v1.1 at 2024-12-04 08:02:40 +0000