asm_mips_gnu.c

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// SPDX-FileCopyrightText: 2009-2018 pancake <pancake@nopcode.org>
// SPDX-FileCopyrightText: 2009-2018 nibble <nibble.ds@gmail.com>
// SPDX-License-Identifier: LGPL-3.0-only
 
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
 
#include <rz_types.h>
#include <rz_lib.h>
#include <rz_util.h>
#include <rz_asm.h>
 
#include "disas-asm.h"
#include "opcode/mips.h"
int mips_assemble(const char *str, ut64 pc, ut8 *out);
 
static int mips_mode = 0;
static unsigned long Offset = 0;
static RzStrBuf *buf_global = NULL;
static unsigned char bytes[4];
static char *pre_cpu = NULL;
static char *pre_features = NULL;
 
static int mips_buffer_read_memory(bfd_vma memaddr, bfd_byte *myaddr, unsigned int length, struct disassemble_info *info) {
    int delta = (memaddr - Offset);
    if (delta < 0) {
        return -1; // disable backward reads
    }
    if ((delta + length) > 4) {
        return -1;
    }
    memcpy(myaddr, bytes + delta, length);
    return 0;
}
 
static int symbol_at_address(bfd_vma addr, struct disassemble_info *info) {
    return 0;
}
 
static void memory_error_func(int status, bfd_vma memaddr, struct disassemble_info *info) {
    //--
}
 
DECLARE_GENERIC_PRINT_ADDRESS_FUNC()
DECLARE_GENERIC_FPRINTF_FUNC()
 
static int disassemble(struct rz_asm_t *a, struct rz_asm_op_t *op, const ut8 *buf, int len) {
    static struct disassemble_info disasm_obj;
    if (len < 4) {
        return -1;
    }
    buf_global = &op->buf_asm;
    Offset = a->pc;
    memcpy(bytes, buf, 4); // TODO handle thumb
 
    if ((a->cpu != pre_cpu) && (a->features != pre_features)) {
        free(disasm_obj.disassembler_options);
        memset(&disasm_obj, '\0', sizeof(struct disassemble_info));
    }
 
    /* prepare disassembler */
    if (a->cpu && (!pre_cpu || !strcmp(a->cpu, pre_cpu))) {
        if (!rz_str_casecmp(a->cpu, "mips64r2")) {
            disasm_obj.mach = bfd_mach_mipsisa64r2;
        } else if (!rz_str_casecmp(a->cpu, "mips32r2")) {
            disasm_obj.mach = bfd_mach_mipsisa32r2;
        } else if (!rz_str_casecmp(a->cpu, "mips64")) {
            disasm_obj.mach = bfd_mach_mipsisa64;
        } else if (!rz_str_casecmp(a->cpu, "mips32")) {
            disasm_obj.mach = bfd_mach_mipsisa32;
        }
        pre_cpu = rz_str_dup(pre_cpu, a->cpu);
    }
 
    if (a->features && (!pre_features || !strcmp(a->features, pre_features))) {
        free(disasm_obj.disassembler_options);
        if (strstr(a->features, "n64")) {
            disasm_obj.disassembler_options = rz_str_new("abi=n64");
        } else if (strstr(a->features, "n32")) {
            disasm_obj.disassembler_options = rz_str_new("abi=n32");
        } else if (strstr(a->features, "o32")) {
            disasm_obj.disassembler_options = rz_str_new("abi=o32");
        }
        pre_features = rz_str_dup(pre_features, a->features);
    }
 
    mips_mode = a->bits;
    disasm_obj.arch = CPU_LOONGSON_2F;
    disasm_obj.buffer = bytes;
    disasm_obj.read_memory_func = &mips_buffer_read_memory;
    disasm_obj.symbol_at_address_func = &symbol_at_address;
    disasm_obj.memory_error_func = &memory_error_func;
    disasm_obj.print_address_func = &generic_print_address_func;
    disasm_obj.buffer_vma = Offset;
    disasm_obj.buffer_length = 4;
    disasm_obj.endian = !a->big_endian;
    disasm_obj.fprintf_func = &generic_fprintf_func;
    disasm_obj.stream = stdout;
    op->size = (disasm_obj.endian == BFD_ENDIAN_LITTLE)
        ? print_insn_little_mips((bfd_vma)Offset, &disasm_obj)
        : print_insn_big_mips((bfd_vma)Offset, &disasm_obj);
    if (op->size == -1) {
        rz_strbuf_set(&op->buf_asm, "(data)");
    }
    return op->size;
}
 
static int assemble(RzAsm *a, RzAsmOp *op, const char *str) {
    ut8 *opbuf = (ut8 *)rz_strbuf_get(&op->buf);
    int ret = mips_assemble(str, a->pc, opbuf);
    if (a->big_endian) {
        ut8 tmp = opbuf[0];
        opbuf[0] = opbuf[3];
        opbuf[3] = tmp;
        tmp = opbuf[1];
        opbuf[1] = opbuf[2];
        opbuf[2] = tmp;
    }
    return ret;
}
 
RzAsmPlugin rz_asm_plugin_mips_gnu = {
    .name = "mips.gnu",
    .arch = "mips",
    .license = "GPL3",
    .bits = 32 | 64,
    .endian = RZ_SYS_ENDIAN_LITTLE | RZ_SYS_ENDIAN_BIG,
    .desc = "MIPS CPU",
    .disassemble = &disassemble,
    .assemble = &assemble
};
 
#ifndef RZ_PLUGIN_INCORE
RZ_API RzLibStruct rizin_plugin = {
    .type = RZ_LIB_TYPE_ASM,
    .data = &rz_asm_plugin_mips_gnu,
    .version = RZ_VERSION
};
#endif