asm_addint8.c revision aa1c2ca808a267a5a3c372de5461c1f67f9a8869 
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 <byteswap.h>
35#include <endian.h>
36#include <inttypes.h>
37#include <string.h>
38
39#include <libasmP.h>
40
41#ifndef SIZE
42# define SIZE 8
43#endif
44
45#define FCT(size) _FCT(size)
46#define _FCT(size) asm_addint##size
47#define TYPE(size) _TYPE(size)
48#define _TYPE(size) int##size##_t
49#define BSWAP(size) _BSWAP(size)
50#define _BSWAP(size) bswap_##size
51
52
53int
54FCT(SIZE) (AsmScn_t *asmscn, TYPE(SIZE) num)
55{
56  if (asmscn == NULL)
57    return -1;
58
59  if (asmscn->type == SHT_NOBITS && unlikely (num != 0))
60    {
61      __libasm_seterrno (ASM_E_TYPE);
62      return -1;
63    }
64
65  if (unlikely (asmscn->ctx->textp))
66    {
67      // XXX Needs to use backend specified pseudo-ops
68      if (SIZE == 8)
69	fprintf (asmscn->ctx->out.file, "\t.byte\t%" PRId8 "\n", (int8_t) num);
70      else if (SIZE == 16)
71	fprintf (asmscn->ctx->out.file, "\t.value\t%" PRId16 "\n",
72		 (int16_t) num);
73      else if (SIZE == 32)
74	fprintf (asmscn->ctx->out.file, "\t.long\t%" PRId32 "\n",
75		 (int32_t) num);
76      else
77	{
78	  // XXX This is not necessary for 64-bit machines
79	  bool is_leb = (elf_getident (asmscn->ctx->out.elf, NULL)[EI_DATA]
80			 == ELFDATA2LSB);
81
82	  fprintf (asmscn->ctx->out.file,
83		   "\t.long\t%" PRId32 "\n\t.long\t%" PRId32 "\n",
84		   (int32_t) (is_leb
85			      ? num % 0x100000000ll : num / 0x100000000ll),
86		   (int32_t) (is_leb
87			      ? num / 0x100000000ll : num % 0x100000000ll));
88	}
89    }
90  else
91    {
92#if SIZE > 8
93      bool is_leb = (elf_getident (asmscn->ctx->out.elf, NULL)[EI_DATA]
94		     == ELFDATA2LSB);
95#endif
96      TYPE(SIZE) var = num;
97
98      /* Make sure we have enough room.  */
99      if (__libasm_ensure_section_space (asmscn, SIZE / 8) != 0)
100	return -1;
101
102#if SIZE > 8
103      if ((BYTE_ORDER == LITTLE_ENDIAN && !is_leb)
104	  || (BYTE_ORDER == BIG_ENDIAN && is_leb))
105	var = BSWAP(SIZE) (var);
106#endif
107
108      /* Copy the variable value.  */
109      if (likely (asmscn->type == SHT_NOBITS))
110	memcpy (&asmscn->content->data[asmscn->content->len], &var, SIZE / 8);
111
112      /* Adjust the pointer in the data buffer.  */
113      asmscn->content->len += SIZE / 8;
114
115      /* Increment the offset in the (sub)section.  */
116      asmscn->offset += SIZE / 8;
117    }
118
119  return 0;
120}
121INTDEF(FCT(SIZE))
122