blob: 11709ae732d1ed40e9130ac22bf1d9bc339908c7 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
/* * $OpenBSD: symbol.c,v 1.8 2003/04/16 02:15:10 deraadt Exp $ - symbol table routines*/
/*
*/
/* Create the symbol table entries for `etext', `edata' and `end'. */
#include <sys/param.h>
#include <sys/types.h>
#include <fcntl.h>
#include <a.out.h>
#include <stab.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "ld.h"
symbol *symtab[SYMTABSIZE]; /* The symbol table. */
int num_hash_tab_syms; /* Number of symbols in symbol hash table. */
symbol *edata_symbol; /* the symbol _edata */
symbol *etext_symbol; /* the symbol _etext */
symbol *end_symbol; /* the symbol _end */
symbol *got_symbol; /* the symbol __GLOBAL_OFFSET_TABLE_ */
symbol *dynamic_symbol; /* the symbol __DYNAMIC */
void
symtab_init(int relocatable_output)
{
/*
* Put linker reserved symbols into symbol table.
*/
#ifndef nounderscore
#define ETEXT_SYM "_etext"
#define EDATA_SYM "_edata"
#define END_SYM "_end"
#define DYN_SYM "__DYNAMIC"
#define GOT_SYM "__GLOBAL_OFFSET_TABLE_"
#define OTHER_SYM "_GLOBAL_OFFSET_TABLE_"
#else
#define ETEXT_SYM "etext"
#define EDATA_SYM "edata"
#define END_SYM "end"
#define DYN_SYM "_DYNAMIC"
#define GOT_SYM "_GLOBAL_OFFSET_TABLE_"
#define OTHER_SYM "__GLOBAL_OFFSET_TABLE_"
#endif
dynamic_symbol = getsym(DYN_SYM);
dynamic_symbol->defined = relocatable_output?N_UNDF:(N_DATA | N_EXT);
got_symbol = getsym(GOT_SYM);
got_symbol->defined = N_DATA | N_EXT;
if (relocatable_output)
return;
etext_symbol = getsym(ETEXT_SYM);
edata_symbol = getsym(EDATA_SYM);
end_symbol = getsym(END_SYM);
etext_symbol->defined = N_TEXT | N_EXT;
edata_symbol->defined = N_DATA | N_EXT;
end_symbol->defined = N_BSS | N_EXT;
etext_symbol->flags |= GS_REFERENCED;
edata_symbol->flags |= GS_REFERENCED;
end_symbol->flags |= GS_REFERENCED;
}
/*
* Compute the hash code for symbol name KEY.
*/
static int
hash_string(char *key)
{
char *cp;
int k;
cp = key;
k = 0;
while (*cp)
k = (((k << 1) + (k >> 14)) ^ (*cp++)) & 0x3fff;
return k;
}
/*
* Get the symbol table entry for the global symbol named KEY.
* Create one if there is none.
*/
symbol *
getsym(char *key)
{
int hashval;
symbol *bp;
if (strcmp(key, OTHER_SYM) == 0)
key = GOT_SYM;
/* Determine the proper bucket. */
hashval = hash_string(key) % SYMTABSIZE;
/* Search the bucket. */
for (bp = symtab[hashval]; bp; bp = bp->link)
if (strcmp(key, bp->name) == 0)
return bp;
/* Nothing was found; create a new symbol table entry. */
bp = (symbol *)xmalloc(sizeof(symbol));
bp->name = (char *)xstrdup(key);
bp->refs = 0;
bp->defined = 0;
bp->value = 0;
bp->common_size = 0;
bp->warning = 0;
bp->undef_refs = 0;
bp->mult_defs = 0;
bp->alias = 0;
bp->setv_count = 0;
bp->symbolnum = 0;
bp->rrs_symbolnum = 0;
bp->size = 0;
bp->aux = 0;
bp->sorefs = 0;
bp->so_defined = 0;
bp->def_lsp = 0;
bp->jmpslot_offset = -1;
bp->gotslot_offset = -1;
bp->flags = 0;
/* Add the entry to the bucket. */
bp->link = symtab[hashval];
symtab[hashval] = bp;
++num_hash_tab_syms;
return bp;
}
/* Like `getsym' but return 0 if the symbol is not already known. */
symbol *
getsym_soft(char *key)
{
int hashval;
symbol *bp;
if (strcmp(key, OTHER_SYM) == 0)
key = GOT_SYM;
/* Determine which bucket. */
hashval = hash_string(key) % SYMTABSIZE;
/* Search the bucket. */
for (bp = symtab[hashval]; bp; bp = bp->link)
if (strcmp(key, bp->name) == 0)
return bp;
return 0;
}
|
