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/*

 * Copyright (c) 2002-2005 The TenDRA Project <http://www.tendra.org/>.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 * 1. Redistributions of source code must retain the above copyright notice,

 *    this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright notice,

 *    this list of conditions and the following disclaimer in the documentation

 *    and/or other materials provided with the distribution.

 * 3. Neither the name of The TenDRA Project nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific, prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS

 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;

 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *

 * $Id$

 */

/*

    		 Crown Copyright (c) 1997

    This TenDRA(r) Computer Program is subject to Copyright

    owned by the United Kingdom Secretary of State for Defence

    acting through the Defence Evaluation and Research Agency

    (DERA).  It is made available to Recipients with a

    royalty-free licence for its use, reproduction, transfer

    to other parties and amendment for any purpose not excluding

    product development provided that any such use et cetera

    shall be deemed to be acceptance of the following conditions:-

        (1) Its Recipients shall ensure that this Notice is

        reproduced upon any copies or amended versions of it;

        (2) Any amended version of it shall be clearly marked to

        show both the nature of and the organisation responsible

        for the relevant amendment or amendments;

        (3) Its onward transfer from a recipient to another

        party shall be deemed to be that party's acceptance of

        these conditions;

        (4) DERA gives no warranty or assurance as to its

        quality or suitability for any purpose and DERA accepts

        no liability whatsoever in relation to any use to which

        it may be put.

*/

/* linux/assembler.c */

/**********************************************************************

$Author: release $

$Date: 1998/01/17 15:55:52 $

$Revision: 1.1.1.1 $

$Log: assembler.c,v $

 * Revision 1.1.1.1  1998/01/17  15:55:52  release

 * First version to be checked into rolling release.

 *

 * Revision 1.10  1997/03/24  12:43:22  pwe

 * outn int->long

 *

 * Revision 1.9  1996/02/16  10:11:01  pwe

 * Linux/ELF struct result and PIC jump table

 *

 * Revision 1.8  1996/02/08  13:45:24  pwe

 * Linux elf v aout option

 *

 * Revision 1.7  1995/11/23  12:17:02  pwe

 * linux elf

 *

 * Revision 1.6  1995/10/13  15:20:07  pwe

 * solaris PIC and linux tcc

 *

 * Revision 1.5  1995/10/09  15:14:20  pwe

 * dynamic initialisation etc

 *

 * Revision 1.4  1995/04/12  13:22:04  pwe

 * end_tdf label added in case nothing but static strings

 *

 * Revision 1.3  1995/01/30  12:57:10  pwe

 * Ownership -> PWE, tidy banners

 *

 * Revision 1.2  1995/01/27  17:24:41  jmf

 * Unknown change?

 *

 * Revision 1.1  1994/11/08  16:27:43  jmf

 * Initial revision

 *

 * Revision 1.2  1994/07/13  07:51:05  jmf

 * Added Log

 *

**********************************************************************/

#include "config.h"

#include "common_types.h"

#include "out.h"

#include "expmacs.h"

#include "exp.h"

#include "localflags.h"

#include "shapemacs.h"

#include "operand.h"

#include "machine.h"

#include "flags.h"

#include "basicread.h"

#include "coder.h"

#include "assembler.h"

#include "instr.h"

#include "instr386.h"

#include "xalloc.h"

#include "install_fns.h"

#include <string.h>

/* PROCEDURES */

void

dot_align(int n)

{

  if (linux_elf) {

    outs(".align ");

    outn((long)n);

    outnl();

    return;

  }

  if (n == 1) {

    return;

  }

  outs(".align ");

  switch (n) {

    case 16:

      n = 4; break;

    case 8:

      n = 3; break;

    case 4:

      n = 2; break;

    default:

      n = 1; break;

  };

  outn((long)n);

  outnl();

  return;

}

void

outbyte(void)

{

  outs(".byte ");

  return;

}

void

outshort(void)

{

  outs(".value ");

  return;

}

void

outlong(void)

{

  outs(".long ");

  return;

}

void

align_label(int f, exp jr)

{

  if (linux_elf) {

    if (is80486 && !is80586 && ptno(jr) != last_jump_label) {

/* forward jump and continued into

      if (f==0)

        outs(".align 8");

*/

      if (f == 1) {	/* repeat jump */

        outs(".align 4");

      }

      if (f == 2) {	/* preceded by a jmp or ret */

        outs(".align 16");

      }

      outs("\n");

    }

    return;

  } else {

    if (is80486 && !is80586 && ptno(jr)!= last_jump_label) {

/* forward jump and continued into

      if (f==0)

        outs(".align 16,7,1");

*/

      if (f == 1) {	/* repeat jump */

        outs(".align 3,0x90");

      }

      if (f == 2) {	/* preceded by a jmp or ret */

        outs(".align 4,0x90");

      }

      if (f == 3) {

        outs(".align 2,0x90");

      }

      outs("\n");

    }

    if (is80586 && ptno(jr)!= last_jump_label) {

      if (f >= 1 && f <= 3) {

        outs(".align 2,0x90\n");

      }

    }

    return;

  }

}

void

eval_postlude(char *s, exp c)

{

  if (!linux_elf) {

    return;

  }

  outs(".size ");

  outs(s);

  outs(",");

  outn((long)(shape_size(sh(c)) + 7) / 8);

  outnl();

  outs(".type ");

  outs(s);

  outs(",@object");

  outnl();

  return;

}

void

out_readonly_section(void)

{

  if (linux_elf) {

    outs(".section .rodata");

  } else {

    outs(".text");

  }

  return;

}

void

out_dot_comm(char *id, shape sha)

{

	outs(".comm ");

	outs(id);

	outs(",");

	outn((long)(((shape_size(sha) / 8) + 3) / 4) * 4);

	outnl();

  return;

}

void

out_dot_lcomm(char *id, shape sha)

{

	outs(".lcomm ");

	outs(id);

	outs(",");

	outn((long)(((shape_size(sha) / 8) + 3) / 4) * 4);

	outnl();

  return;

}

void

out_bss(char *id, shape sha)

{

	outs(".bss ");

	outs(id);

	outs(",");

	outn((long)(((shape_size(sha) / 8) + 3) / 4) * 4);

	outnl();

  return;

}

static int pic_label;

void

pic_prelude(void)

{

  int n = next_lab();

  pic_label = n;

  outs(" call ");

  outs(local_prefix);

  outn((long)n);

  outnl();

  outs(local_prefix);

  outn((long)n);

  outs(":");

  outnl();

  outs(" popl %ebx");

  outnl();

  outs(" addl $_GLOBAL_OFFSET_TABLE_+ [.-");

  outs(local_prefix);

  outn((long)n);

  outs("],%ebx");

  outnl();

  return;

}

void

out_rename(char *oldid, char *newid)

{

  UNUSED(oldid);

  UNUSED(newid);

  return;

}

void

out_switch_jump(int tab, where a, int min)

{

  if (PIC_code) {

    if (min != 0) {

      sub(slongsh, mw(zeroe,min), a, reg0);

      a = reg0;

    }

    if (eq_where(a, reg0)) {

      outs(" movl ");

    } else {

      outs(" movl %ebx,%eax");

      outnl();

      outs(" subl ");

    }

    outs(local_prefix);

    outn((long)tab);

    outs("@GOTOFF(%ebx,");

    operand(32, a, 1, 0);

    outs(",4),%eax");

    outnl();

    if (eq_where(a, reg0)) {

      outs(" subl %ebx,%eax");

      outnl();

      outs(" negl %eax");

      outnl();

    }

    outs(" jmp *%eax");

    outnl();

    return;

  } else  {

    outs(" jmp *");

    outs(local_prefix);

    outn((long)tab);

    outs("-");

    outn((long)(4 * min));

    outs("(,");

    operand(32, a, 1, 0);

    outs(",4)");

    outnl();

    return;

  };

}

void

out_switch_table(int tab, int min, int max, int *v, int absent)

{

  int i;

  dot_align(4);

  outnl();

  outs(local_prefix);

  outn((long)tab);

  outs(":");

  outnl();

  for (i = min; i <= max; ++i) {

    outs(".long ");

    if (v[i - min]!= -1) {

      if (PIC_code) {

	outs(" _GLOBAL_OFFSET_TABLE_+ [.-");

	outs(local_prefix);

	outn((long)v[i - min]);

	outs("]");

      } else {

	outs(local_prefix);

	outn((long)v[i - min]);

      }

    } else {

      if (absent == -1) {

        outn((long)0);

      } else {

	if (PIC_code) {

	  outs(" _GLOBAL_OFFSET_TABLE_+ [.-");

	  outs(local_prefix);

	  outn((long)absent);

	  outs("]");

	} else {

	  outs(local_prefix);

	  outn((long)absent);

	}

      }

    }

    outnl();

  }

  outnl();

  return;

}

void

proc_size(char *s)

{

  outs(".align 4");

  outnl();

  outs(".size ");

  outs(s);

  outs(", .-");

  outs(s);

  outnl();

  return;

}

void

proc_type(char *s)

{

  outs(".type ");

  outs(s);

  outs(",@function");

  outnl();

  return;

}

void

outend(void)

{		/* close the output */

  int st;

  outs(".text");

  outnl();

  dot_align(16);

  outnl();

  outs("___tdf_end:");

  outnl();

  st = fclose(fpout);

  if (st == EOF) {

    failer("failed to close file");

    exit(EXIT_FAILURE);

  }

}

void

outopenbr(void)

{

  return;

}

void

outclosebr(void)

{

  return;

}

void

outdivsym(void)

{

  outs("/");

  return;

}

void

out_initialiser(char *id)

{

  if (!linux_elf) {

    outs(".stabs \"___TDFI_LIST__\",22,0,0,");

    outs(id);

    outnl();

    outnl();

    return;

  }

  outs(".section .init\n");

  outs(" call ");

  outs(id);

  if (PIC_code) {

    outs("@PLT");

  }

  outnl();

  outnl();

  return;

}

void

out_main_prelude(void)

{

  /* if (!linux_elf) */

  int nl1 = next_lab();

  int nl2 = next_lab();

  min_rfree |= 0x8;

  outs(" movl $___TDFI_LIST__+4, %ebx\n");

  outs(local_prefix);

  outn((long)nl1);

  outs(":\n");

  outs(" movl (%ebx),%eax\n");

  outs(" cmpl $0,%eax\n");

  simple_branch("je", nl2);

  outs(" call *%eax\n");

  outs(" addl $4,%ebx\n");

  simple_branch("jmp", nl1);

  outs(local_prefix);

  outn((long)nl2);

  outs(":\n");

  return;

}

void

out_main_postlude(void)

{

  /* if (!linux_elf) */

  char *sdummy = "Idummy";

  char *pdummy = (char *)xcalloc(((int)strlen(local_prefix) +

				  (int)strlen(sdummy) + 1), sizeof(char));

  strcpy(pdummy, local_prefix);

  strcat(pdummy, sdummy);

  outs(".text\n");

  outs(pdummy);

  outs(":\n");

  outs(" ret\n");

  out_initialiser(pdummy);

  return;

}