asm_arc.c

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// SPDX-FileCopyrightText: 2012-2018 pancake <pancake@nopcode.org>
// 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 <mybfd.h>
 
/* extern */
int decodeInstr(bfd_vma address, disassemble_info *info);
int ARCTangent_decodeInstr(bfd_vma address, disassemble_info *info);
int ARCompact_decodeInstr(bfd_vma address, disassemble_info *info);
 
/* ugly globals */
static ut32 Offset = 0;
static RzStrBuf *buf_global = NULL;
static int buf_len = 0;
static ut8 bytes[32] = { 0 };
 
static int arc_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) > sizeof(bytes)) {
        return -1;
    }
    memcpy(myaddr, bytes + delta, RZ_MIN(buf_len - 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(RzAsm *a, RzAsmOp *op, const ut8 *buf, int len) {
    static struct disassemble_info disasm_obj;
    if (len < 2) {
        return -1;
    }
    buf_global = &op->buf_asm;
    Offset = a->pc;
    if (len > sizeof(bytes)) {
        len = sizeof(bytes);
    }
    memcpy(bytes, buf, len); // TODO handle compact
    buf_len = len;
    /* prepare disassembler */
    memset(&disasm_obj, '\0', sizeof(struct disassemble_info));
    disasm_obj.buffer = bytes;
    disasm_obj.buffer_length = len;
    disasm_obj.read_memory_func = &arc_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.endian = !a->big_endian;
    disasm_obj.fprintf_func = &generic_fprintf_func;
    disasm_obj.stream = stdout;
    disasm_obj.mach = 0;
    rz_strbuf_set(&op->buf_asm, "");
    if (a->bits == 16) {
        op->size = ARCompact_decodeInstr((bfd_vma)Offset, &disasm_obj);
    } else {
        op->size = ARCTangent_decodeInstr((bfd_vma)Offset, &disasm_obj);
    }
    if (op->size == -1) {
        rz_strbuf_set(&op->buf_asm, "(data)");
    }
    return op->size;
}
 
RzAsmPlugin rz_asm_plugin_arc = {
    .name = "arc",
    .arch = "arc",
    .bits = 16 | 32,
    .endian = RZ_SYS_ENDIAN_LITTLE | RZ_SYS_ENDIAN_BIG,
    .desc = "Argonaut RISC Core",
    .disassemble = &disassemble,
    .license = "GPL3"
};
 
#ifndef RZ_PLUGIN_INCORE
RZ_API RzLibStruct rizin_plugin = {
    .type = RZ_LIB_TYPE_ASM,
    .data = &rz_asm_plugin_arc,
    .version = RZ_VERSION
};
#endif