rizin/librz/bin/p/bin_bios.c

156 lines
3.5 KiB
C

// SPDX-FileCopyrightText: 2013-2019 pancake <pancake@nopcode.org>
// SPDX-License-Identifier: LGPL-3.0-only
#include <rz_types.h>
#include <rz_util.h>
#include <rz_lib.h>
#include <rz_bin.h>
#include "../i/private.h"
static bool check_buffer(RzBuffer *buf) {
rz_return_val_if_fail(buf, false);
ut64 sz = rz_buf_size(buf);
if (sz <= 0xffff) {
return false;
}
ut8 b0;
if (!rz_buf_read8_at(buf, 0, &b0)) {
return false;
}
if (b0 == 0xcf || b0 == 0x7f) {
return false;
}
const ut32 ep = sz - 0x10000 + 0xfff0; /* F000:FFF0 address */
/* hacky check to avoid detecting multidex or MZ bins as bios */
/* need better fix for this */
ut8 tmp[3];
int r = rz_buf_read_at(buf, 0, tmp, sizeof(tmp));
if (r <= 0 || !memcmp(tmp, "dex", 3) || !memcmp(tmp, "MZ", 2)) {
return false;
}
/* Check if this a 'jmp' opcode */
ut8 bep;
if (!rz_buf_read8_at(buf, ep, &bep)) {
return false;
}
return bep == 0xea || bep == 0xe9;
}
static bool load_buffer(RzBinFile *bf, RzBinObject *obj, RzBuffer *buf, Sdb *sdb) {
if (!check_buffer(buf)) {
return false;
}
obj->bin_obj = rz_buf_ref(buf);
return true;
}
static void destroy(RzBinFile *bf) {
rz_buf_free(bf->o->bin_obj);
}
static ut64 baddr(RzBinFile *bf) {
return 0;
}
/* accelerate binary load */
static RzPVector /*<RzBinString *>*/ *strings(RzBinFile *bf) {
return NULL;
}
static RzBinInfo *info(RzBinFile *bf) {
RzBinInfo *ret = NULL;
if (!(ret = RZ_NEW0(RzBinInfo))) {
return NULL;
}
ret->lang = NULL;
ret->file = bf->file ? strdup(bf->file) : NULL;
ret->type = strdup("bios");
ret->bclass = strdup("1.0");
ret->rclass = strdup("bios");
ret->os = strdup("any");
ret->subsystem = strdup("unknown");
ret->machine = strdup("pc");
ret->arch = strdup("x86");
ret->has_va = 1;
ret->bits = 16;
ret->big_endian = 0;
ret->dbg_info = 0;
return ret;
}
static RzPVector /*<RzBinSection *>*/ *sections(RzBinFile *bf) {
RzPVector *ret = NULL;
RzBinSection *ptr = NULL;
RzBuffer *obj = bf->o->bin_obj;
if (!(ret = rz_pvector_new((RzPVectorFree)rz_bin_section_free))) {
return NULL;
}
// program headers is another section
if (!(ptr = RZ_NEW0(RzBinSection))) {
return ret;
}
ptr->name = strdup("bootblk"); // Maps to 0xF000:0000 segment
ptr->vsize = ptr->size = 0x10000;
ptr->paddr = rz_buf_size(bf->buf) - ptr->size;
ptr->vaddr = 0xf0000;
ptr->perm = RZ_PERM_RWX;
rz_pvector_push(ret, ptr);
// If image bigger than 128K - add one more section
if (bf->size >= 0x20000) {
if (!(ptr = RZ_NEW0(RzBinSection))) {
return ret;
}
ptr->name = strdup("_e000"); // Maps to 0xE000:0000 segment
ptr->vsize = ptr->size = 0x10000;
ptr->paddr = rz_buf_size(obj) - 2 * ptr->size;
ptr->vaddr = 0xe0000;
ptr->perm = RZ_PERM_RWX;
rz_pvector_push(ret, ptr);
}
return ret;
}
static RzPVector /*<RzBinAddr *>*/ *entries(RzBinFile *bf) {
RzPVector *ret;
RzBinAddr *ptr = NULL;
if (!(ret = rz_pvector_new(free))) {
return NULL;
}
if (!(ptr = RZ_NEW0(RzBinAddr))) {
return ret;
}
ptr->paddr = 0; // 0x70000;
ptr->vaddr = 0xffff0;
rz_pvector_push(ret, ptr);
return ret;
}
RzBinPlugin rz_bin_plugin_bios = {
.name = "bios",
.desc = "BIOS bin plugin",
.license = "LGPL",
.load_buffer = &load_buffer,
.destroy = &destroy,
.check_buffer = &check_buffer,
.baddr = &baddr,
.entries = entries,
.maps = rz_bin_maps_of_file_sections,
.sections = sections,
.strings = &strings,
.info = &info,
};
#ifndef RZ_PLUGIN_INCORE
RZ_API RzLibStruct rizin_plugin = {
.type = RZ_LIB_TYPE_BIN,
.data = &rz_bin_plugin_bios,
.version = RZ_VERSION
};
#endif