libasm/asm_addint8.c

/* Add integer to a section.
   Copyright (C) 2002 Red Hat, Inc.
   Written by Ulrich Drepper <drepper@redhat.com>, 2002.

   This program is Open Source software; you can redistribute it and/or
   modify it under the terms of the Open Software License version 1.0 as
   published by the Open Source Initiative.

   You should have received a copy of the Open Software License along
   with this program; if not, you may obtain a copy of the Open Software
   License version 1.0 from http://www.opensource.org/licenses/osl.php or
   by writing the Open Source Initiative c/o Lawrence Rosen, Esq.,
   3001 King Ranch Road, Ukiah, CA 95482.   */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <byteswap.h>
#include <endian.h>
#include <inttypes.h>
#include <string.h>

#include <libasmP.h>

#ifndef SIZE
# define SIZE 8
#endif

#define FCT(size) _FCT(size)
#define _FCT(size) asm_addint##size
#define TYPE(size) _TYPE(size)
#define _TYPE(size) int##size##_t
#define BSWAP(size) _BSWAP(size)
#define _BSWAP(size) bswap_##size


int
FCT(SIZE) (asmscn, num)
     AsmScn_t *asmscn;
     TYPE(SIZE) num;
{
  if (asmscn == NULL)
    return -1;

  if (asmscn->type == SHT_NOBITS && unlikely (num != 0))
    {
      __libasm_seterrno (ASM_E_TYPE);
      return -1;
    }

  if (unlikely (asmscn->ctx->textp))
    {
      // XXX Needs to use backend specified pseudo-ops
      if (SIZE == 8)
	printf ("\t.byte\t%" PRId8 "\n", (int8_t) num);
      else if (SIZE == 16)
	printf ("\t.value\t%" PRId16 "\n", (int16_t) num);
      else if (SIZE == 32)
	printf ("\t.long\t%" PRId32 "\n", (int32_t) num);
      else
	{
	  // XXX This is not necessary for 64-bit machines
	  bool is_leb = (elf_getident (asmscn->ctx->out.elf, NULL)[EI_DATA]
			 == ELFDATA2LSB);

	  printf ("\t.long\t%" PRId32 "\n\t.long\t%" PRId32 "\n",
		  (int32_t) (is_leb
			     ? num % 0x100000000ll : num / 0x100000000ll),
		  (int32_t) (is_leb
			     ? num / 0x100000000ll : num % 0x100000000ll));
	}
    }
  else
    {
#if SIZE > 8
      bool is_leb = (elf_getident (asmscn->ctx->out.elf, NULL)[EI_DATA]
		     == ELFDATA2LSB);
#endif
      TYPE(SIZE) var = num;

      /* Make sure we have enough room.  */
      if (__libasm_ensure_section_space (asmscn, SIZE / 8) != 0)
	return -1;

#if SIZE > 8
      if ((BYTE_ORDER == LITTLE_ENDIAN && !is_leb)
	  || (BYTE_ORDER == BIG_ENDIAN && is_leb))
	var = BSWAP(SIZE) (var);
#endif

      /* Copy the variable value.  */
      if (likely (asmscn->type == SHT_NOBITS))
	memcpy (&asmscn->content->data[asmscn->content->len], &var, SIZE / 8);

      /* Adjust the pointer in the data buffer.  */
      asmscn->content->len += SIZE / 8;

      /* Increment the offset in the (sub)section.  */
      asmscn->offset += SIZE / 8;
    }

  return 0;
}
INTDEF(FCT(SIZE))