| 1 | /* |
| 2 | * $Id: symbol.c,v 1.2 1993/11/09 04:19:04 paul Exp $ - symbol table routines |
| 3 | */ |
| 4 | |
| 5 | /* Create the symbol table entries for `etext', `edata' and `end'. */ |
| 6 | |
| 7 | #include <sys/param.h> |
| 8 | #include <stdio.h> |
| 9 | #include <stdlib.h> |
| 10 | #include <sys/types.h> |
| 11 | #include <fcntl.h> |
| 12 | #include <a.out.h> |
| 13 | #include <stab.h> |
| 14 | #include <string.h> |
| 15 | |
| 16 | #include "ld.h" |
| 17 | |
| 18 | void |
| 19 | symtab_init (relocatable_output) |
| 20 | int relocatable_output; |
| 21 | { |
| 22 | /* |
| 23 | * Put linker reserved symbols into symbol table. |
| 24 | */ |
| 25 | |
| 26 | dynamic_symbol = getsym ("__DYNAMIC"); |
| 27 | dynamic_symbol->defined = relocatable_output?N_UNDF:(N_DATA | N_EXT); |
| 28 | dynamic_symbol->referenced = 0; |
| 29 | dynamic_symbol->value = 0; |
| 30 | |
| 31 | got_symbol = getsym ("__GLOBAL_OFFSET_TABLE_"); |
| 32 | got_symbol->defined = N_DATA | N_EXT; |
| 33 | got_symbol->referenced = 0; |
| 34 | got_symbol->value = 0; |
| 35 | |
| 36 | if (relocatable_output) |
| 37 | return; |
| 38 | |
| 39 | #ifndef nounderscore |
| 40 | edata_symbol = getsym ("_edata"); |
| 41 | etext_symbol = getsym ("_etext"); |
| 42 | end_symbol = getsym ("_end"); |
| 43 | #else |
| 44 | edata_symbol = getsym ("edata"); |
| 45 | etext_symbol = getsym ("etext"); |
| 46 | end_symbol = getsym ("end"); |
| 47 | #endif |
| 48 | edata_symbol->defined = N_DATA | N_EXT; |
| 49 | etext_symbol->defined = N_TEXT | N_EXT; |
| 50 | end_symbol->defined = N_BSS | N_EXT; |
| 51 | |
| 52 | edata_symbol->referenced = 1; |
| 53 | etext_symbol->referenced = 1; |
| 54 | end_symbol->referenced = 1; |
| 55 | } |
| 56 | |
| 57 | /* Compute the hash code for symbol name KEY. */ |
| 58 | |
| 59 | int |
| 60 | hash_string (key) |
| 61 | char *key; |
| 62 | { |
| 63 | register char *cp; |
| 64 | register int k; |
| 65 | |
| 66 | cp = key; |
| 67 | k = 0; |
| 68 | while (*cp) |
| 69 | k = (((k << 1) + (k >> 14)) ^ (*cp++)) & 0x3fff; |
| 70 | |
| 71 | return k; |
| 72 | } |
| 73 | |
| 74 | /* Get the symbol table entry for the global symbol named KEY. |
| 75 | Create one if there is none. */ |
| 76 | |
| 77 | symbol * |
| 78 | getsym(key) |
| 79 | char *key; |
| 80 | { |
| 81 | register int hashval; |
| 82 | register symbol *bp; |
| 83 | |
| 84 | /* Determine the proper bucket. */ |
| 85 | hashval = hash_string (key) % TABSIZE; |
| 86 | |
| 87 | /* Search the bucket. */ |
| 88 | for (bp = symtab[hashval]; bp; bp = bp->link) |
| 89 | if (! strcmp (key, bp->name)) |
| 90 | return bp; |
| 91 | |
| 92 | /* Nothing was found; create a new symbol table entry. */ |
| 93 | bp = (symbol *) xmalloc (sizeof (symbol)); |
| 94 | bp->refs = 0; |
| 95 | bp->name = (char *) xmalloc (strlen (key) + 1); |
| 96 | strcpy (bp->name, key); |
| 97 | bp->defined = 0; |
| 98 | bp->referenced = 0; |
| 99 | bp->trace = 0; |
| 100 | bp->value = 0; |
| 101 | bp->max_common_size = 0; |
| 102 | bp->warning = 0; |
| 103 | bp->undef_refs = 0; |
| 104 | bp->multiply_defined = 0; |
| 105 | bp->alias = 0; |
| 106 | bp->setv_count = 0; |
| 107 | bp->symbolnum = 0; |
| 108 | bp->rrs_symbolnum = 0; |
| 109 | |
| 110 | bp->size = 0; |
| 111 | bp->aux = 0; |
| 112 | bp->sorefs = 0; |
| 113 | bp->so_defined = 0; |
| 114 | bp->def_nlist = 0; |
| 115 | bp->jmpslot_offset = -1; |
| 116 | bp->gotslot_offset = -1; |
| 117 | bp->jmpslot_claimed = 0; |
| 118 | bp->gotslot_claimed = 0; |
| 119 | bp->cpyreloc_reserved = 0; |
| 120 | bp->cpyreloc_claimed = 0; |
| 121 | |
| 122 | /* Add the entry to the bucket. */ |
| 123 | bp->link = symtab[hashval]; |
| 124 | symtab[hashval] = bp; |
| 125 | |
| 126 | ++num_hash_tab_syms; |
| 127 | |
| 128 | return bp; |
| 129 | } |
| 130 | |
| 131 | /* Like `getsym' but return 0 if the symbol is not already known. */ |
| 132 | |
| 133 | symbol * |
| 134 | getsym_soft (key) |
| 135 | char *key; |
| 136 | { |
| 137 | register int hashval; |
| 138 | register symbol *bp; |
| 139 | |
| 140 | /* Determine which bucket. */ |
| 141 | |
| 142 | hashval = hash_string (key) % TABSIZE; |
| 143 | |
| 144 | /* Search the bucket. */ |
| 145 | |
| 146 | for (bp = symtab[hashval]; bp; bp = bp->link) |
| 147 | if (! strcmp (key, bp->name)) |
| 148 | return bp; |
| 149 | |
| 150 | return 0; |
| 151 | } |