1 /* Define new symbol for current position in given section.
2 Copyright (C) 2002, 2005, 2016, 2017 Red Hat, Inc.
3 This file is part of elfutils.
4 Written by Ulrich Drepper <drepper@redhat.com>, 2002.
5
6 This file is free software; you can redistribute it and/or modify
7 it under the terms of either
8
9 * the GNU Lesser General Public License as published by the Free
10 Software Foundation; either version 3 of the License, or (at
11 your option) any later version
12
13 or
14
15 * the GNU General Public License as published by the Free
16 Software Foundation; either version 2 of the License, or (at
17 your option) any later version
18
19 or both in parallel, as here.
20
21 elfutils is distributed in the hope that it will be useful, but
22 WITHOUT ANY WARRANTY; without even the implied warranty of
23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24 General Public License for more details.
25
26 You should have received copies of the GNU General Public License and
27 the GNU Lesser General Public License along with this program. If
28 not, see <http://www.gnu.org/licenses/>. */
29
30 #ifdef HAVE_CONFIG_H
31 # include <config.h>
32 #endif
33
34 #include <inttypes.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <string.h>
38
39 #include <libasmP.h>
40 #include <system.h>
41
42
43 AsmSym_t *
asm_newsym(AsmScn_t * asmscn,const char * name,GElf_Xword size,int type,int binding)44 asm_newsym (AsmScn_t *asmscn, const char *name, GElf_Xword size,
45 int type, int binding)
46 {
47 /* We don't really expect labels with many digits, but in theory it could
48 be 10 digits (plus ".L" and a zero terminator). */
49 #define TEMPSYMLEN 13
50 char tempsym[TEMPSYMLEN];
51 AsmSym_t *result;
52
53 if (asmscn == NULL)
54 /* Something went wrong before. */
55 return NULL;
56
57 /* Generate a temporary symbol if necessary. */
58 if (name == NULL)
59 {
60 /* If a local symbol name is created the symbol better have
61 local binding. */
62 if (binding != STB_LOCAL)
63 {
64 __libasm_seterrno (ASM_E_INVALID);
65 return NULL;
66 }
67
68 // XXX This requires getting the format from the machine backend. */
69 snprintf (tempsym, TEMPSYMLEN, ".L%07u", asmscn->ctx->tempsym_count++);
70
71 name = tempsym;
72 }
73
74 size_t name_len = strlen (name) + 1;
75
76 result = (AsmSym_t *) malloc (sizeof (AsmSym_t) + name_len);
77 if (result == NULL)
78 return NULL;
79
80 rwlock_wrlock (asmscn->ctx->lock);
81
82 result->scn = asmscn;
83 result->offset = asmscn->offset;
84 result->size = size;
85 result->type = type;
86 result->binding = binding;
87 result->symidx = 0;
88 result->strent = dwelf_strtab_add (asmscn->ctx->symbol_strtab,
89 memcpy (result + 1, name, name_len));
90
91 if (unlikely (asmscn->ctx->textp))
92 {
93 /* We are only interested in the name and don't need to know whether
94 it is a local name or not. */
95 /* First print the binding pseudo-op. */
96 if (binding == STB_GLOBAL)
97 fprintf (asmscn->ctx->out.file, "\t.globl\t%s\n", name);
98 else if (binding == STB_WEAK)
99 fprintf (asmscn->ctx->out.file, "\t.weak\t%s\n", name);
100
101 /* Next the symbol type. */
102 if (type == STT_OBJECT)
103 fprintf (asmscn->ctx->out.file, "\t.type\t%s,@object\n", name);
104 else if (type == STT_FUNC)
105 fprintf (asmscn->ctx->out.file, "\t.type\t%s,@function\n", name);
106
107 /* Finally the size and the label. */
108 fprintf (asmscn->ctx->out.file, "\t.size\t%s,%" PRIuMAX "\n%s:\n",
109 name, (uintmax_t) size, name);
110 }
111 else
112 {
113 /* Put the symbol in the hash table so that we can later find it. */
114 if (asm_symbol_tab_insert (&asmscn->ctx->symbol_tab, elf_hash (name),
115 result) != 0)
116 {
117 /* The symbol already exists. */
118 __libasm_seterrno (ASM_E_DUPLSYM);
119 /* Note that we can free the entry since there must be no
120 reference in the string table to the string. We can only
121 fail to insert the symbol into the symbol table if there
122 is already a symbol with this name. In this case the
123 dwelf_strtab_add function would use the previously provided
124 name. */
125 free (result);
126 result = NULL;
127 }
128 else if (name != tempsym && asm_emit_symbol_p (name))
129 /* Only count non-private symbols. */
130 ++asmscn->ctx->nsymbol_tab;
131 }
132
133 rwlock_unlock (asmscn->ctx->lock);
134
135 return result;
136 }
137