1/* Define new symbol for current position in given section.
2   Copyright (C) 2002, 2005 Red Hat, Inc.
3   This file is part of Red Hat elfutils.
4   Written by Ulrich Drepper <drepper@redhat.com>, 2002.
5
6   Red Hat elfutils is free software; you can redistribute it and/or modify
7   it under the terms of the GNU General Public License as published by the
8   Free Software Foundation; version 2 of the License.
9
10   Red Hat elfutils is distributed in the hope that it will be useful, but
11   WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   General Public License for more details.
14
15   You should have received a copy of the GNU General Public License along
16   with Red Hat elfutils; if not, write to the Free Software Foundation,
17   Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
18
19   Red Hat elfutils is an included package of the Open Invention Network.
20   An included package of the Open Invention Network is a package for which
21   Open Invention Network licensees cross-license their patents.  No patent
22   license is granted, either expressly or impliedly, by designation as an
23   included package.  Should you wish to participate in the Open Invention
24   Network licensing program, please visit www.openinventionnetwork.com
25   <http://www.openinventionnetwork.com>.  */
26
27#ifdef HAVE_CONFIG_H
28# include <config.h>
29#endif
30
31#include <inttypes.h>
32#include <stdio.h>
33#include <stdlib.h>
34#include <string.h>
35
36#include <libasmP.h>
37#include <system.h>
38
39
40AsmSym_t *
41asm_newsym (asmscn, name, size, type, binding)
42     AsmScn_t *asmscn;
43     const char *name;
44     GElf_Xword size;
45     int type;
46     int binding;
47{
48#define TEMPSYMLEN 10
49  char tempsym[TEMPSYMLEN];
50  AsmSym_t *result;
51
52  if (asmscn == NULL)
53    /* Something went wrong before.  */
54    return NULL;
55
56  /* Generate a temporary symbol if necessary.  */
57  if (name == NULL)
58    {
59      /* If a local symbol name is created the symbol better have
60	 local binding.  */
61      if (binding != STB_LOCAL)
62	{
63	  __libasm_seterrno (ASM_E_INVALID);
64	  return NULL;
65	}
66
67      // XXX This requires getting the format from the machine backend.  */
68      snprintf (tempsym, TEMPSYMLEN, ".L%07u", asmscn->ctx->tempsym_count++);
69
70      name = tempsym;
71    }
72
73  size_t name_len = strlen (name) + 1;
74
75  result = (AsmSym_t *) malloc (sizeof (AsmSym_t) + name_len);
76  if (result == NULL)
77    return NULL;
78
79  rwlock_wrlock (asmscn->ctx->lock);
80
81  result->scn = asmscn;
82  result->offset = asmscn->offset;
83  result->size = size;
84  result->type = type;
85  result->binding = binding;
86  result->symidx = 0;
87  result->strent = ebl_strtabadd (asmscn->ctx->symbol_strtab,
88				  memcpy (result + 1, name, name_len), 0);
89
90  if (unlikely (asmscn->ctx->textp))
91    {
92      /* We are only interested in the name and don't need to know whether
93	 it is a local name or not.  */
94      /* First print the binding pseudo-op.  */
95      if (binding == STB_GLOBAL)
96	fprintf (asmscn->ctx->out.file, "\t.globl\t%s\n", name);
97      else if (binding == STB_WEAK)
98	fprintf (asmscn->ctx->out.file, "\t.weak\t%s\n", name);
99
100      /* Next the symbol type.  */
101      if (type == STT_OBJECT)
102	fprintf (asmscn->ctx->out.file, "\t.type\t%s,@object\n", name);
103      else if (type == STT_FUNC)
104	fprintf (asmscn->ctx->out.file, "\t.type\t%s,@function\n", name);
105
106      /* Finally the size and the label.  */
107      fprintf (asmscn->ctx->out.file, "\t.size\t%s,%" PRIuMAX "\n%s:\n",
108	       name, (uintmax_t) size, name);
109    }
110  else
111    {
112      /* Put the symbol in the hash table so that we can later find it.  */
113      if (asm_symbol_tab_insert (&asmscn->ctx->symbol_tab, elf_hash (name),
114				 result) != 0)
115	{
116	  /* The symbol already exists.  */
117	  __libasm_seterrno (ASM_E_DUPLSYM);
118	  /* Note that we can free the entry since there must be no
119	     reference in the string table to the string.  We can only
120	     fail to insert the symbol into the symbol table if there
121	     is already a symbol with this name.  In this case the
122	     ebl_strtabadd function would use the previously provided
123	     name.  */
124	  free (result);
125	  result = NULL;
126	}
127      else if (name != tempsym && asm_emit_symbol_p (name))
128	/* Only count non-private symbols.  */
129	++asmscn->ctx->nsymbol_tab;
130    }
131
132  rwlock_unlock (asmscn->ctx->lock);
133
134  return result;
135}
136