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/* dyngen-i386.c -- i386 parts of dyngen

   Copyright (C) 2005 György `nog' Jeney, nog@sdf.lonestar.org

This file is part of OpenRISC 1000 Architectural Simulator.

This program is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2 of the License, or

(at your option) any later version.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program; if not, write to the Free Software

Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */

#include <stdio.h>

#include <stdint.h>

#include <stdlib.h>

#include <elf.h>

#include "dyngen.h"

#define RET_OPCODE 0xc3

unsigned int i386_get_real_func_len(void *f_start, unsigned int f_len, char *name)

{

  if(((uint8_t *)f_start)[f_len - 1] != RET_OPCODE) {

    fprintf(stderr, "`%s' does not have a ret at the end!\n", name);

    exit(1);

  }

  return f_len - 1;

}

void i386_gen_reloc(FILE *f, struct reloc *reloc, unsigned int param)

{

  switch(reloc->type) {

  case R_386_32:

    fprintf(f, "        *(uint32_t *)(host_page + %d) = *(ops_param + %u) + %d;\n",

            reloc->func_offset, param - 1, reloc->addend);

    break;

  default:

    fprintf(stderr, "Unknown i386 relocation: %i (%s)\n", reloc->type,

            reloc->name);

  }

}

void i386_gen_func_reloc(FILE *f, struct reloc *reloc)

{

  switch(reloc->type) {

  case R_386_32:

    /* This relocation is absolute.  There is nothing to relocate (The linker

     * handles this fine). */

    break;

  case R_386_PC32:

    fprintf(f, "        *(uint32_t *)(host_page + %d) = (uint32_t)((%s + %d) - (unsigned int)(host_page + %d));\n",

            reloc->func_offset, reloc->name, reloc->addend, reloc->func_offset);

    break;

  default:

    fprintf(stderr, "Unknown i386 relocation: %i (symbol: %s)\n", reloc->type,

            reloc->name);

  }

}

const struct archf archfs = {

  i386_get_real_func_len,

  i386_gen_reloc,

  i386_gen_func_reloc

};