asm_riscv_cs.c

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// SPDX-FileCopyrightText: 2019 pancake <pancake@nopcode.org>
// SPDX-License-Identifier: LGPL-3.0-only
 
#include <rz_asm.h>
#include <rz_lib.h>
#include <capstone/capstone.h>
 
static csh cd = 0;
#include "cs_mnemonics.c"
 
static int disassemble(RzAsm *a, RzAsmOp *op, const ut8 *buf, int len) {
    cs_insn *insn;
    int mode = (a->bits == 64) ? CS_MODE_RISCV64 : CS_MODE_RISCV32;
    op->size = 4;
    if (cd != 0) {
        cs_close(&cd);
    }
    int ret = cs_open(CS_ARCH_RISCV, mode, &cd);
    if (ret) {
        goto fin;
    }
#if 0
    if (a->syntax == RZ_ASM_SYNTAX_REGNUM) {
        cs_option (cd, CS_OPT_SYNTAX, CS_OPT_SYNTAX_NOREGNAME);
    } else {
        cs_option (cd, CS_OPT_SYNTAX, CS_OPT_SYNTAX_DEFAULT);
    }
    cs_option (cd, CS_OPT_DETAIL, CS_OPT_OFF);
#endif
    int n = cs_disasm(cd, (ut8 *)buf, len, a->pc, 1, &insn);
    if (n < 1) {
        rz_asm_op_set_asm(op, "invalid");
        op->size = 2;
        goto beach;
    }
    if (insn->size < 1) {
        goto beach;
    }
    op->size = insn->size;
    char *str = rz_str_newf("%s%s%s", insn->mnemonic, insn->op_str[0] ? " " : "", insn->op_str);
    if (str) {
        rz_str_replace_char(str, '$', 0);
        // remove the '$'<registername> in the string
        rz_asm_op_set_asm(op, str);
        free(str);
    }
    cs_free(insn, n);
beach:
    // cs_close (&cd);
fin:
    return op->size;
}
 
RzAsmPlugin rz_asm_plugin_riscv_cs = {
    .name = "riscv.cs",
    .desc = "Capstone RISCV disassembler",
    .license = "BSD",
    .arch = "riscv",
    .cpus = "",
    .bits = 32 | 64,
    .endian = RZ_SYS_ENDIAN_LITTLE | RZ_SYS_ENDIAN_BIG,
    .disassemble = &disassemble,
    .mnemonics = mnemonics,
};
 
#ifndef RZ_PLUGIN_INCORE
RZ_API RzLibStruct rizin_plugin = {
    .type = RZ_LIB_TYPE_ASM,
    .data = &rz_asm_plugin_riscv_cs,
    .version = RZ_VERSION
};
#endif