/* dyngen-i386.c -- i386 parts of dyngen
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/* dyngen-i386.c -- i386 parts of dyngen
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Copyright (C) 2005 György `nog' Jeney, nog@sdf.lonestar.org
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Copyright (C) 2005 György `nog' Jeney, nog@sdf.lonestar.org
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This file is part of OpenRISC 1000 Architectural Simulator.
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This file is part of OpenRISC 1000 Architectural Simulator.
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This program is free software; you can redistribute it and/or modify
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include <stdio.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdlib.h>
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#include <elf.h>
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#include <elf.h>
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#include "dyngen.h"
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#include "dyngen.h"
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#define RET_OPCODE 0xc3
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#define RET_OPCODE 0xc3
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unsigned int i386_get_real_func_len(void *f_start, unsigned int f_len, char *name)
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unsigned int i386_get_real_func_len(void *f_start, unsigned int f_len, char *name)
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{
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{
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if(((uint8_t *)f_start)[f_len - 1] != RET_OPCODE) {
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if(((uint8_t *)f_start)[f_len - 1] != RET_OPCODE) {
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fprintf(stderr, "`%s' does not have a ret at the end!\n", name);
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fprintf(stderr, "`%s' does not have a ret at the end!\n", name);
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exit(1);
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exit(1);
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}
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}
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return f_len - 1;
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return f_len - 1;
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}
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}
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void i386_gen_reloc(FILE *f, struct reloc *reloc, unsigned int param)
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void i386_gen_reloc(FILE *f, struct reloc *reloc, unsigned int param)
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{
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{
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switch(reloc->type) {
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switch(reloc->type) {
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case R_386_32:
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case R_386_32:
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fprintf(f, " *(uint32_t *)(host_page + %d) = *(ops_param + %u) + %d;\n",
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fprintf(f, " *(uint32_t *)(host_page + %d) = *(ops_param + %u) + %d;\n",
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reloc->func_offset, param - 1, reloc->addend);
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reloc->func_offset, param - 1, reloc->addend);
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break;
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break;
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default:
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default:
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fprintf(stderr, "Unknown i386 relocation: %i (%s)\n", reloc->type,
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fprintf(stderr, "Unknown i386 relocation: %i (%s)\n", reloc->type,
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reloc->name);
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reloc->name);
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}
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}
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}
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}
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void i386_gen_func_reloc(FILE *f, struct reloc *reloc)
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void i386_gen_func_reloc(FILE *f, struct reloc *reloc)
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{
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{
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switch(reloc->type) {
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switch(reloc->type) {
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case R_386_32:
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case R_386_32:
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/* This relocation is absolute. There is nothing to relocate (The linker
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/* This relocation is absolute. There is nothing to relocate (The linker
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* handles this fine). */
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* handles this fine). */
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break;
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break;
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case R_386_PC32:
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case R_386_PC32:
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fprintf(f, " *(uint32_t *)(host_page + %d) = (uint32_t)((%s + %d) - (unsigned int)(host_page + %d));\n",
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fprintf(f, " *(uint32_t *)(host_page + %d) = (uint32_t)((%s + %d) - (unsigned int)(host_page + %d));\n",
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reloc->func_offset, reloc->name, reloc->addend, reloc->func_offset);
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reloc->func_offset, reloc->name, reloc->addend, reloc->func_offset);
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break;
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break;
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default:
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default:
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fprintf(stderr, "Unknown i386 relocation: %i (symbol: %s)\n", reloc->type,
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fprintf(stderr, "Unknown i386 relocation: %i (symbol: %s)\n", reloc->type,
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reloc->name);
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reloc->name);
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}
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}
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}
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}
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const struct archf archfs = {
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const struct archf archfs = {
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i386_get_real_func_len,
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i386_get_real_func_len,
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i386_gen_reloc,
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i386_gen_reloc,
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i386_gen_func_reloc
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i386_gen_func_reloc
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};
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};
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