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/*

    		 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

    PROTO_N ( (n) )

    PROTO_T ( 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

    PROTO_Z ()

{

  outs(".byte ");

  return;

}

void outshort

    PROTO_Z ()

{

  outs(".value ");

  return;

}

void outlong

    PROTO_Z ()

{

  outs(".long ");

  return;

}

void align_label

    PROTO_N ( (f, jr) )

    PROTO_T ( int f X 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

    PROTO_N ( (s, c) )

    PROTO_T ( char * s X 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

    PROTO_Z ()

{

  if (linux_elf)

    outs (".section .rodata");

  else

    outs (".text");

  return;

}

void out_dot_comm

    PROTO_N ( (id, sha) )

    PROTO_T ( char * id X shape sha )

{

	outs (".comm ");

	outs (id);

	outs (",");

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

	outnl ();

  return;

}

void out_dot_lcomm

    PROTO_N ( (id, sha) )

    PROTO_T ( char * id X shape sha )

{

	outs (".lcomm ");

	outs (id);

	outs (",");

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

	outnl ();

  return;

}

void out_bss

    PROTO_N ( (id, sha) )

    PROTO_T ( char * id X 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

    PROTO_Z ()

{

  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

    PROTO_N ( (oldid, newid) )

    PROTO_T ( char * oldid X char * newid )

{

  UNUSED(oldid); UNUSED(newid);

  return;

}

void out_switch_jump

    PROTO_N ( (tab, a, min) )

    PROTO_T ( int tab X where a X 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

    PROTO_N ( (tab, min, max, v, absent) )

    PROTO_T ( int tab X int min X int max X int * v X 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

    PROTO_N ( (s) )

    PROTO_T ( char * s )

{

  outs(".align 4");

  outnl();

  outs(".size ");

  outs(s);

  outs(", .-");

  outs(s);

  outnl();

  return;

}

void proc_type

    PROTO_N ( (s) )

    PROTO_T ( char * s )

{

  outs(".type ");

  outs(s);

  outs(",@function");

  outnl();

  return;

}

void outend

    PROTO_Z ()

{		/* 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

    PROTO_Z ()

{

  return;

}

void outclosebr

    PROTO_Z ()

{

  return;

}

void outdivsym

    PROTO_Z ()

{

  outs("/");

  return;

}

void out_initialiser

    PROTO_N ( (id) )

    PROTO_T ( 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

    PROTO_Z ()		/* 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

    PROTO_Z ()	/* 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;

}