xref: /third_party/elfutils/libasm/asm_addint8.c (revision da0c48c4) 
1/* Add integer to a section.
2   Copyright (C) 2002, 2005 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 <string.h>
36
37#include <libasmP.h>
38
39#ifndef SIZE
40# define SIZE 8
41#endif
42
43#define FCT(size) _FCT(size)
44#define _FCT(size) asm_addint##size
45#define TYPE(size) _TYPE(size)
46#define _TYPE(size) int##size##_t
47#define BSWAP(size) _BSWAP(size)
48#define _BSWAP(size) bswap_##size
49
50
51int
52FCT(SIZE) (AsmScn_t *asmscn, TYPE(SIZE) num)
53{
54  if (asmscn == NULL)
55    return -1;
56
57  if (asmscn->type == SHT_NOBITS && unlikely (num != 0))
58    {
59      __libasm_seterrno (ASM_E_TYPE);
60      return -1;
61    }
62
63  if (unlikely (asmscn->ctx->textp))
64    {
65      // XXX Needs to use backend specified pseudo-ops
66      if (SIZE == 8)
67	fprintf (asmscn->ctx->out.file, "\t.byte\t%" PRId8 "\n", (int8_t) num);
68      else if (SIZE == 16)
69	fprintf (asmscn->ctx->out.file, "\t.value\t%" PRId16 "\n",
70		 (int16_t) num);
71      else if (SIZE == 32)
72	fprintf (asmscn->ctx->out.file, "\t.long\t%" PRId32 "\n",
73		 (int32_t) num);
74      else
75	{
76	  // XXX This is not necessary for 64-bit machines
77	  bool is_leb = (elf_getident (asmscn->ctx->out.elf, NULL)[EI_DATA]
78			 == ELFDATA2LSB);
79
80	  fprintf (asmscn->ctx->out.file,
81		   "\t.long\t%" PRId32 "\n\t.long\t%" PRId32 "\n",
82		   (int32_t) (is_leb
83			      ? num % 0x100000000ll : num / 0x100000000ll),
84		   (int32_t) (is_leb
85			      ? num / 0x100000000ll : num % 0x100000000ll));
86	}
87    }
88  else
89    {
90#if SIZE > 8
91      bool is_leb = (elf_getident (asmscn->ctx->out.elf, NULL)[EI_DATA]
92		     == ELFDATA2LSB);
93#endif
94      TYPE(SIZE) var = num;
95
96      /* Make sure we have enough room.  */
97      if (__libasm_ensure_section_space (asmscn, SIZE / 8) != 0)
98	return -1;
99
100#if SIZE > 8
101      if ((BYTE_ORDER == LITTLE_ENDIAN && !is_leb)
102	  || (BYTE_ORDER == BIG_ENDIAN && is_leb))
103	var = BSWAP(SIZE) (var);
104#endif
105
106      /* Copy the variable value.  */
107      if (likely (asmscn->type == SHT_NOBITS))
108	memcpy (&asmscn->content->data[asmscn->content->len], &var, SIZE / 8);
109
110      /* Adjust the pointer in the data buffer.  */
111      asmscn->content->len += SIZE / 8;
112
113      /* Increment the offset in the (sub)section.  */
114      asmscn->offset += SIZE / 8;
115    }
116
117  return 0;
118}
119INTDEF(FCT(SIZE))
120