1 /* Create new ABS symbol.
2 Copyright (C) 2002, 2016 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 /* Object for special COMMON section. */
44 static const AsmScn_t __libasm_abs_scn =
45 {
46 .data = {
47 .main = {
48 .scn = ASM_ABS_SCN
49 }
50 }
51 };
52
53
54 AsmSym_t *
asm_newabssym(AsmCtx_t * ctx,const char * name,GElf_Xword size,GElf_Addr value,int type,int binding)55 asm_newabssym (AsmCtx_t *ctx, const char *name, GElf_Xword size,
56 GElf_Addr value, int type, int binding)
57 {
58 AsmSym_t *result;
59
60 if (ctx == NULL)
61 /* Something went wrong before. */
62 return NULL;
63
64 /* Common symbols are public. Therefore the user must provide a
65 name. */
66 if (name == NULL)
67 {
68 __libasm_seterrno (ASM_E_INVALID);
69 return NULL;
70 }
71
72 rwlock_wrlock (ctx->lock);
73
74 result = (AsmSym_t *) malloc (sizeof (AsmSym_t));
75 if (result == NULL)
76 return NULL;
77
78 result->scn = (AsmScn_t *) &__libasm_abs_scn;
79 result->size = size;
80 result->type = type;
81 result->binding = binding;
82 result->symidx = 0;
83 result->strent = dwelf_strtab_add (ctx->symbol_strtab, name);
84
85 /* The value of an ABS symbol must not be modified. Since there are
86 no subsection and the initial offset of the section is 0 we can
87 get the alignment recorded by storing it into the offset
88 field. */
89 result->offset = value;
90
91 if (unlikely (ctx->textp))
92 {
93 /* An absolute symbol can be defined by giving a symbol a
94 specific value. */
95 if (binding == STB_GLOBAL)
96 fprintf (ctx->out.file, "\t.globl %s\n", name);
97 else if (binding == STB_WEAK)
98 fprintf (ctx->out.file, "\t.weak %s\n", name);
99
100 if (type == STT_OBJECT)
101 fprintf (ctx->out.file, "\t.type %s,@object\n", name);
102 else if (type == STT_FUNC)
103 fprintf (ctx->out.file, "\t.type %s,@function\n", name);
104
105 fprintf (ctx->out.file, "%s = %llu\n",
106 name, (unsigned long long int) value);
107
108 if (size != 0)
109 fprintf (ctx->out.file, "\t.size %s, %llu\n",
110 name, (unsigned long long int) size);
111 }
112 else
113 {
114 /* Put the symbol in the hash table so that we can later find it. */
115 if (asm_symbol_tab_insert (&ctx->symbol_tab, elf_hash (name), result)
116 != 0)
117 {
118 /* The symbol already exists. */
119 __libasm_seterrno (ASM_E_DUPLSYM);
120 free (result);
121 result = NULL;
122 }
123 else if (name != NULL && asm_emit_symbol_p (name))
124 /* Only count non-private symbols. */
125 ++ctx->nsymbol_tab;
126 }
127
128 rwlock_unlock (ctx->lock);
129
130 return result;
131 }
132