1/* Create new ABS symbol.
2   Copyright (C) 2002 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.  */
44static const AsmScn_t __libasm_abs_scn =
45  {
46    .data = {
47      .main = {
48	.scn = ASM_ABS_SCN
49      }
50    }
51  };
52
53
54AsmSym_t *
55asm_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 = ebl_strtabadd (ctx->symbol_strtab, name, 0);
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