450 lines
10 KiB
C
450 lines
10 KiB
C
/* $Id$ */
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/* Copyright (c) 2011 Pierre Pronchery <khorben@defora.org> */
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/* This file is part of DeforaOS Devel asm */
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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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* the Free Software Foundation, version 3 of the License.
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*
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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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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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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, see <http://www.gnu.org/licenses/>. */
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#include <System.h>
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#include <assert.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <arpa/inet.h>
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#include "arch.h"
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#include "format.h"
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#include "common.h"
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#include "code.h"
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/* Code */
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/* private */
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/* types */
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typedef struct _CodeString
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{
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int id;
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char * name;
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off_t offset;
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ssize_t length;
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} CodeString;
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struct _Code
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{
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Arch * arch;
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ArchDescription * description;
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Format * format;
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char * filename;
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FILE * fp;
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/* strings */
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CodeString * strings;
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size_t strings_cnt;
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};
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/* prototypes */
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/* strings */
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static void _code_string_delete_all(Code * code);
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static CodeString * _code_string_get_by_id(Code * code, AsmId id);
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static int _code_string_set(CodeString * codestring, int id, char const * name,
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off_t offset, ssize_t length);
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static CodeString * _code_string_append(Code * code);
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static int _code_string_read(Code * code, CodeString * codestring);
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/* functions */
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/* code_new */
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Code * code_new(char const * arch, char const * format)
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{
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Code * code;
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if((code = object_new(sizeof(*code))) == NULL)
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return NULL;
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memset(code, 0, sizeof(*code));
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if((code->arch = arch_new(arch)) != NULL && format == NULL)
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format = arch_get_format(code->arch);
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if(format != NULL)
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code->format = format_new(format, arch);
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if(code->arch == NULL || code->format == NULL)
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{
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code_delete(code);
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return NULL;
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}
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code->description = arch_get_description(code->arch);
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return code;
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}
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/* code_delete */
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int code_delete(Code * code)
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{
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int ret = 0;
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if(code->format != NULL)
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format_delete(code->format);
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if(code->arch != NULL)
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arch_delete(code->arch);
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if(code->fp != NULL && fclose(code->fp) != 0)
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ret |= error_set_code(2, "%s: %s", code->filename, strerror(
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errno));
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string_delete(code->filename);
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object_delete(code);
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return ret;
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}
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/* accessors */
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/* code_get_arch */
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char const * code_get_arch(Code * code)
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{
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return arch_get_name(code->arch);
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}
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/* code_get_filename */
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char const * code_get_filename(Code * code)
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{
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return code->filename;
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}
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/* code_get_format */
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char const * code_get_format(Code * code)
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{
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return format_get_name(code->format);
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}
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/* useful */
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/* code_close */
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int code_close(Code * code)
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{
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int ret = 0;
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ret |= arch_exit(code->arch);
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ret |= format_exit(code->format);
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if(code->fp != NULL && fclose(code->fp) != 0 && ret == 0)
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ret |= -error_set_code(1, "%s: %s", code->filename,
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strerror(errno));
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code->fp = NULL;
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_code_string_delete_all(code);
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return ret;
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}
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/* code_decode */
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static int _decode_print(Code * code, ArchInstructionCall * call);
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static void _decode_print_immediate(Code * code, ArchOperand * ao);
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int code_decode(Code * code, char const * buffer, size_t size)
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{
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int ret;
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ArchInstructionCall * calls = NULL;
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size_t calls_cnt = 0;
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size_t i;
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arch_init_buffer(code->arch, buffer, size);
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if((ret = arch_decode(code->arch, &calls, &calls_cnt)) == 0)
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{
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fprintf(stderr, "DEBUG: %lu\n", calls_cnt);
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for(i = 0; i < calls_cnt; i++)
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_decode_print(code, &calls[i]);
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free(calls);
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}
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arch_exit(code->arch);
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return ret;
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}
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static int _decode_print(Code * code, ArchInstructionCall * call)
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{
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char const * sep = " ";
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size_t i;
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uint8_t u8;
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ArchOperand * ao;
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char const * name;
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if(arch_seek(code->arch, call->offset, SEEK_SET) < 0)
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return -1;
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printf("%8lx:", (long)call->base + (long)call->offset);
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for(i = 0; i < call->size; i++)
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{
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if(arch_read(code->arch, &u8, sizeof(u8)) != sizeof(u8))
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return -1;
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printf(" %02x", u8);
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}
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for(; i < 8; i++)
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printf(" ");
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printf(" %-12s", call->name);
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for(i = 0; i < call->operands_cnt; i++)
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{
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ao = &call->operands[i];
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fputs(sep, stdout);
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switch(AO_GET_TYPE(ao->type))
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{
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case AOT_DREGISTER:
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name = ao->value.dregister.name;
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if(ao->value.dregister.offset == 0)
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{
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printf("[%%%s]", name);
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break;
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}
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printf("[%%%s + $0x%lx]", name,
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ao->value.dregister.offset);
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break;
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case AOT_DREGISTER2:
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name = ao->value.dregister2.name;
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printf("[%%%s + %%%s]", name,
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ao->value.dregister2.name2);
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break;
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case AOT_IMMEDIATE:
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_decode_print_immediate(code, ao);
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break;
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case AOT_REGISTER:
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name = call->operands[i].value._register.name;
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printf("%%%s", name);
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break;
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}
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sep = ", ";
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}
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putchar('\n');
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return 0;
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}
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static void _decode_print_immediate(Code * code, ArchOperand * ao)
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{
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CodeString * cs;
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printf("%s$0x%lx", ao->value.immediate.negative ? "-" : "",
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ao->value.immediate.value);
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if(AO_GET_VALUE(ao->type) == AOI_REFERS_STRING)
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{
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cs = _code_string_get_by_id(code, ao->value.immediate.value);
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if(cs != NULL && cs->name == NULL)
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_code_string_read(code, cs);
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if(cs != NULL && cs->name != NULL)
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printf(" \"%s\"", cs->name);
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else
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printf("%s", " (string)");
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}
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}
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/* code_decode_file */
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static int _decode_file_callback(void * priv, char const * section,
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off_t offset, size_t size, off_t base);
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static int _set_string_callback(void * priv, int id, char const * name,
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off_t offset, ssize_t size);
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int code_decode_file(Code * code, char const * filename)
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{
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int ret;
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FILE * fp;
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if((fp = fopen(filename, "r")) == NULL)
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return -error_set_code(1, "%s: %s", filename, strerror(errno));
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arch_init(code->arch, filename, fp);
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format_init(code->format, filename, fp);
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ret = format_decode(code->format, _set_string_callback,
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_decode_file_callback, code);
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format_exit(code->format);
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arch_exit(code->arch);
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if(fclose(fp) != 0 && ret == 0)
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ret = -error_set_code(1, "%s: %s", filename, strerror(errno));
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return ret;
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}
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static int _decode_file_callback(void * priv, char const * section,
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off_t offset, size_t size, off_t base)
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{
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Code * code = priv;
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ArchInstructionCall * calls = NULL;
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size_t calls_cnt = 0;
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size_t i;
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if(section != NULL)
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printf("%s%s:\n", "\nDisassembly of section ", section);
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if(arch_decode_at(code->arch, &calls, &calls_cnt, offset, size, base)
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!= 0)
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return -1;
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for(i = 0; i < calls_cnt; i++)
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_decode_print(code, &calls[i]);
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free(calls);
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return 0;
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}
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static int _set_string_callback(void * priv, int id, char const * name,
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off_t offset, ssize_t length)
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{
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Code * code = priv;
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CodeString * cs = NULL;
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if(id >= 0)
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cs = _code_string_get_by_id(code, id);
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if(cs == NULL)
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cs = _code_string_append(code);
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if(cs == NULL || _code_string_set(cs, id, name, offset, length) != 0)
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return -1;
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return cs->id;
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}
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/* code_function */
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int code_function(Code * code, char const * function)
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{
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return format_function(code->format, function);
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}
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/* code_instruction */
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int code_instruction(Code * code, ArchInstructionCall * call)
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{
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ArchInstruction * ai;
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if((ai = arch_get_instruction_by_call(code->arch, call)) == NULL)
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return -1;
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#ifdef DEBUG
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fprintf(stderr, "DEBUG: instruction %s, opcode 0x%x, 1 0x%x, 2 0x%x"
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", 3 0x%x\n", call->name, ai->opcode, ai->op1, ai->op2,
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ai->op3);
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#endif
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return arch_write(code->arch, ai, call);
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}
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/* code_open */
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int code_open(Code * code, char const * filename)
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{
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if(code->filename != NULL || code->fp != NULL)
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return -error_set_code(1, "A file is already opened");
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if((code->filename = string_new(filename)) == NULL)
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return -1;
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if((code->fp = fopen(filename, "w+")) == NULL)
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return -error_set_code(1, "%s: %s", filename, strerror(errno));
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if(format_init(code->format, code->filename, code->fp) != 0
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|| arch_init(code->arch, code->filename, code->fp) != 0)
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{
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fclose(code->fp);
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code->fp = NULL;
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unlink(code->filename); /* XXX may fail */
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string_delete(code->filename);
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code->filename = NULL;
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return -1;
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}
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return 0;
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}
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/* code_section */
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int code_section(Code * code, char const * section)
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{
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#ifdef DEBUG
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fprintf(stderr, "DEBUG: %s(\"%s\")\n", __func__, section);
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#endif
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return format_section(code->format, section);
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}
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/* private */
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/* functions */
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/* strings */
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/* code_string_delete_all */
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static void _code_string_delete_all(Code * code)
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{
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size_t i;
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for(i = 0; i < code->strings_cnt; i++)
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free(code->strings[i].name);
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code->strings_cnt = 0;
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free(code->strings);
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code->strings = NULL;
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}
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/* code_string_get_by_id */
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static CodeString * _code_string_get_by_id(Code * code, AsmId id)
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{
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size_t i;
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for(i = 0; i < code->strings_cnt; i++)
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if(code->strings[i].id >= 0 && code->strings[i].id == id)
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return &code->strings[i];
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return NULL;
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}
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/* code_string_set */
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static int _code_string_set(CodeString * codestring, int id, char const * name,
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off_t offset, ssize_t length)
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{
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char * p = NULL;
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if(name != NULL && (p = strdup(name)) == NULL)
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return -error_set_code(1, "%s", strerror(errno));
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codestring->id = id;
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free(codestring->name);
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codestring->name = p;
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codestring->offset = offset;
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codestring->length = length;
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return 0;
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}
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/* code_string_append */
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static CodeString * _code_string_append(Code * code)
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{
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CodeString * p;
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if((p = realloc(code->strings, sizeof(*p) * (code->strings_cnt + 1)))
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== NULL)
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{
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error_set_code(1, "%s", strerror(errno));
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return NULL;
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}
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code->strings = p;
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p = &code->strings[code->strings_cnt++];
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p->id = -1;
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p->name = NULL;
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p->offset = -1;
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p->length = -1;
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return p;
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}
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/* code_string_read */
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static int _code_string_read(Code * code, CodeString * codestring)
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{
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char * buf;
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if(codestring->offset < 0 || codestring->length < 0)
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return -error_set_code(1, "%s", "Insufficient information to"
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" read string");
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if(arch_seek(code->arch, codestring->offset, SEEK_SET)
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!= codestring->offset)
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return -1;
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if((buf = malloc(codestring->length + 1)) == NULL)
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return -error_set_code(1, "%s", strerror(errno));
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if(arch_read(code->arch, buf, codestring->length) != codestring->length)
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{
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free(buf);
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return -1;
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}
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buf[codestring->length] = '\0';
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free(codestring->name);
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codestring->name = buf;
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return 0;
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}
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