162 lines
3.3 KiB
C
162 lines
3.3 KiB
C
/*
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* $Id: symbol.c,v 1.8 1994/06/29 11:18:55 pk Exp $ - symbol table routines
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*/
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/* Create the symbol table entries for `etext', `edata' and `end'. */
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#include <sys/param.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <a.out.h>
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#include <stab.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "ld.h"
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symbol *symtab[SYMTABSIZE]; /* The symbol table. */
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int num_hash_tab_syms; /* Number of symbols in symbol hash table. */
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symbol *edata_symbol; /* the symbol _edata */
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symbol *etext_symbol; /* the symbol _etext */
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symbol *end_symbol; /* the symbol _end */
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symbol *got_symbol; /* the symbol __GLOBAL_OFFSET_TABLE_ */
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symbol *dynamic_symbol; /* the symbol __DYNAMIC */
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void
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symtab_init(relocatable_output)
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int relocatable_output;
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{
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/*
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* Put linker reserved symbols into symbol table.
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*/
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#ifndef nounderscore
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#define ETEXT_SYM "_etext"
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#define EDATA_SYM "_edata"
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#define END_SYM "_end"
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#define DYN_SYM "__DYNAMIC"
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#define GOT_SYM "__GLOBAL_OFFSET_TABLE_"
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#else
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#define ETEXT_SYM "etext"
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#define EDATA_SYM "edata"
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#define END_SYM "end"
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#define DYN_SYM "_DYNAMIC"
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#define GOT_SYM "_GLOBAL_OFFSET_TABLE_"
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#endif
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dynamic_symbol = getsym(DYN_SYM);
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dynamic_symbol->defined = relocatable_output?N_UNDF:(N_DATA | N_EXT);
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got_symbol = getsym(GOT_SYM);
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got_symbol->defined = N_DATA | N_EXT;
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if (relocatable_output)
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return;
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etext_symbol = getsym(ETEXT_SYM);
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edata_symbol = getsym(EDATA_SYM);
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end_symbol = getsym(END_SYM);
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etext_symbol->defined = N_TEXT | N_EXT;
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edata_symbol->defined = N_DATA | N_EXT;
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end_symbol->defined = N_BSS | N_EXT;
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etext_symbol->flags |= GS_REFERENCED;
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edata_symbol->flags |= GS_REFERENCED;
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end_symbol->flags |= GS_REFERENCED;
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}
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/*
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* Compute the hash code for symbol name KEY.
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*/
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int
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hash_string (key)
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char *key;
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{
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register char *cp;
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register int k;
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cp = key;
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k = 0;
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while (*cp)
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k = (((k << 1) + (k >> 14)) ^ (*cp++)) & 0x3fff;
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return k;
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}
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/*
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* Get the symbol table entry for the global symbol named KEY.
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* Create one if there is none.
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*/
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symbol *
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getsym(key)
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char *key;
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{
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register int hashval;
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register symbol *bp;
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/* Determine the proper bucket. */
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hashval = hash_string(key) % SYMTABSIZE;
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/* Search the bucket. */
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for (bp = symtab[hashval]; bp; bp = bp->link)
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if (strcmp(key, bp->name) == 0)
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return bp;
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/* Nothing was found; create a new symbol table entry. */
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bp = (symbol *)xmalloc(sizeof(symbol));
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bp->name = (char *)xmalloc(strlen(key) + 1);
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strcpy (bp->name, key);
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bp->refs = 0;
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bp->defined = 0;
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bp->value = 0;
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bp->common_size = 0;
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bp->warning = 0;
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bp->undef_refs = 0;
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bp->mult_defs = 0;
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bp->alias = 0;
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bp->setv_count = 0;
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bp->symbolnum = 0;
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bp->rrs_symbolnum = 0;
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bp->size = 0;
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bp->aux = 0;
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bp->sorefs = 0;
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bp->so_defined = 0;
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bp->def_lsp = 0;
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bp->jmpslot_offset = -1;
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bp->gotslot_offset = -1;
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bp->flags = 0;
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/* Add the entry to the bucket. */
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bp->link = symtab[hashval];
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symtab[hashval] = bp;
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++num_hash_tab_syms;
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return bp;
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}
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/* Like `getsym' but return 0 if the symbol is not already known. */
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symbol *
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getsym_soft (key)
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char *key;
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{
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register int hashval;
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register symbol *bp;
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/* Determine which bucket. */
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hashval = hash_string(key) % SYMTABSIZE;
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/* Search the bucket. */
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for (bp = symtab[hashval]; bp; bp = bp->link)
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if (strcmp(key, bp->name) == 0)
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return bp;
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return 0;
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}
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