rizin/librz/asm/p/asm_ppc_cs.c
Giovanni b1f5b5b454
Remove usage of rz_bin_is_big_endian (#2761)
* Remove usage of rz_bin_is_big_endian which changes the endianness set by the user
2022-07-02 18:36:16 +00:00

141 lines
3.1 KiB
C

// SPDX-FileCopyrightText: 2014-2018 pancake <pancake@nopcode.org>
// SPDX-License-Identifier: LGPL-3.0-only
#include <rz_asm.h>
#include <rz_lib.h>
#include <capstone/capstone.h>
#include "../arch/ppc/libvle/vle.h"
#include "../arch/ppc/libps/libps.h"
static csh handle = 0;
static bool the_end(void *p) {
if (handle) {
cs_close(&handle);
handle = 0;
}
return true;
}
static int decompile_vle(RzAsm *a, RzAsmOp *op, const ut8 *buf, int len) {
vle_t *instr = 0;
vle_handle handle = { 0 };
if (len < 2) {
return -1;
}
if (!vle_init(&handle, buf, len) && (instr = vle_next(&handle))) {
op->size = instr->size;
char buf_asm[64];
vle_snprint(buf_asm, sizeof(buf_asm), a->pc, instr);
rz_asm_op_set_asm(op, buf_asm);
vle_free(instr);
} else {
rz_asm_op_set_asm(op, "invalid");
op->size = 2;
return -1;
}
return op->size;
}
static int decompile_ps(RzAsm *a, RzAsmOp *op, const ut8 *buf, int len) {
ppcps_t instr = { 0 };
if (len < 4) {
return -1;
}
op->size = 4;
const ut32 data = (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
if (libps_decode(data, &instr) < 1) {
rz_asm_op_set_asm(op, "invalid");
return -1;
}
char buf_asm[64];
libps_snprint(buf_asm, sizeof(buf_asm), a->pc, &instr);
rz_asm_op_set_asm(op, buf_asm);
return op->size;
}
static int disassemble(RzAsm *a, RzAsmOp *op, const ut8 *buf, int len) {
static int omode = -1, obits = -1;
int n, ret, mode;
ut64 off = a->pc;
cs_insn *insn;
if (a->cpu && strncmp(a->cpu, "vle", 3) == 0) {
// vle is big-endian only
if (!a->big_endian) {
return -1;
}
ret = decompile_vle(a, op, buf, len);
if (ret >= 0) {
return op->size;
}
} else if (a->cpu && strncmp(a->cpu, "ps", 2) == 0) {
// libps is big-endian only
if (!a->big_endian) {
return -1;
}
ret = decompile_ps(a, op, buf, len);
if (ret >= 0) {
return op->size;
}
}
switch (a->bits) {
case 32:
mode = CS_MODE_32;
break;
case 64:
mode = CS_MODE_64;
break;
default:
mode = 0;
break;
}
mode |= a->big_endian ? CS_MODE_BIG_ENDIAN : CS_MODE_LITTLE_ENDIAN;
if (mode != omode || a->bits != obits) {
cs_close(&handle);
handle = 0;
omode = mode;
obits = a->bits;
}
if (handle == 0) {
ret = cs_open(CS_ARCH_PPC, mode, &handle);
if (ret != CS_ERR_OK) {
return -1;
}
}
op->size = 4;
cs_option(handle, CS_OPT_DETAIL, CS_OPT_OFF);
n = cs_disasm(handle, (const ut8 *)buf, len, off, 1, &insn);
op->size = 4;
if (n > 0 && insn->size > 0) {
const char *opstr = sdb_fmt("%s%s%s", insn->mnemonic,
insn->op_str[0] ? " " : "", insn->op_str);
rz_asm_op_set_asm(op, opstr);
cs_free(insn, n);
return op->size;
}
rz_asm_op_set_asm(op, "invalid");
op->size = 4;
cs_free(insn, n);
return op->size;
}
RzAsmPlugin rz_asm_plugin_ppc_cs = {
.name = "ppc",
.desc = "Capstone PowerPC disassembler",
.license = "BSD",
.author = "pancake",
.arch = "ppc",
.cpus = "ppc,vle,ps",
.bits = 32 | 64,
.endian = RZ_SYS_ENDIAN_LITTLE | RZ_SYS_ENDIAN_BIG,
.fini = the_end,
.disassemble = &disassemble,
};
#ifndef RZ_PLUGIN_INCORE
RZ_API RzLibStruct rizin_plugin = {
.type = RZ_LIB_TYPE_ASM,
.data = &rz_asm_plugin_ppc_cs,
.version = RZ_VERSION
};
#endif