asm_cris_gnu.c

Go to the documentation of this file.

// SPDX-FileCopyrightText: 2014-2018 pancake <pancake@nopcode.org>
// SPDX-License-Identifier: LGPL-3.0-only
 
#if 0
 
Documentation
-------------
http://developer.axis.com/old/documentation/hw/etraxfs/des_ref/des_ref.pdf
http://developer.axis.com/old/documentation/hw/etraxfs/iop_howto/iop_howto.pdf
 
#endif
 
#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"
 
static unsigned long Offset = 0;
static RzStrBuf *buf_global = NULL;
static unsigned char bytes[8];
 
static int cris_buffer_read_memory(bfd_vma memaddr, bfd_byte *myaddr, ut32 length, struct disassemble_info *info) {
    int delta = (memaddr - Offset);
    if (delta < 0) {
        return -1; // disable backward reads
    }
    if ((delta + length) > 8) {
        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()
 
bfd_boolean cris_parse_disassembler_options(disassemble_info *info, int distype);
 
// TODO: refactor the gnu code to have a getter instead of exposing so many disasm entrypoints
int print_insn_crisv10_v32_with_register_prefix(bfd_vma vma, disassemble_info *info);
int print_insn_crisv10_v32_without_register_prefix(bfd_vma vma, disassemble_info *info);
int print_insn_cris_with_register_prefix(bfd_vma vma, disassemble_info *info);
int print_insn_cris_without_register_prefix(bfd_vma vma, disassemble_info *info);
int print_insn_crisv32_with_register_prefix(bfd_vma vma, disassemble_info *info);
int print_insn_crisv32_without_register_prefix(bfd_vma vma, disassemble_info *info);
 
static int disassemble(RzAsm *a, RzAsmOp *op, const ut8 *buf, int len) {
    struct disassemble_info disasm_obj;
    int mode = 2;
    if (len < 4) {
        return -1;
    }
    buf_global = &op->buf_asm;
    Offset = a->pc;
    memcpy(bytes, buf, RZ_MIN(len, 8)); // TODO handle thumb
 
    /* prepare disassembler */
    memset(&disasm_obj, '\0', sizeof(struct disassemble_info));
    disasm_obj.disassembler_options = (a->bits == 64) ? "64" : "";
    disasm_obj.buffer = bytes;
    disasm_obj.read_memory_func = &cris_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;
 
    if (a->cpu && *a->cpu) {
        // enum cris_disass_family { cris_dis_v0_v10, cris_dis_common_v10_v32, cris_dis_v32 };
        // 0: v0-v10
        // 1: v10-v32
        // 2: v32
        mode = 0;
        if (strstr(a->cpu, "v10")) {
            mode = 1;
        }
        if (strstr(a->cpu, "v32")) {
            mode = 2;
        }
    } else {
        mode = 2;
    }
    (void)cris_parse_disassembler_options(&disasm_obj, mode);
    if (a->syntax == RZ_ASM_SYNTAX_ATT) {
        switch (mode) {
        case 0:
            op->size = print_insn_cris_with_register_prefix((bfd_vma)Offset, &disasm_obj);
            break;
        case 1:
            op->size = print_insn_crisv10_v32_with_register_prefix((bfd_vma)Offset, &disasm_obj);
            break;
        default:
            op->size = print_insn_crisv32_with_register_prefix((bfd_vma)Offset, &disasm_obj);
            break;
        }
    } else {
        switch (mode) {
        case 0:
            op->size = print_insn_cris_without_register_prefix((bfd_vma)Offset, &disasm_obj);
            break;
        case 1:
            op->size = print_insn_crisv10_v32_without_register_prefix((bfd_vma)Offset, &disasm_obj);
            break;
        default:
            op->size = print_insn_crisv32_without_register_prefix((bfd_vma)Offset, &disasm_obj);
            break;
        }
    }
    if (op->size == -1) {
        rz_strbuf_set(&op->buf_asm, "(data)");
    }
    return op->size;
}
 
RzAsmPlugin rz_asm_plugin_cris_gnu = {
    .name = "cris",
    .arch = "cris",
    .cpus = "v0,v10,v32",
    .license = "GPL3",
    .author = "pancake",
    .bits = 32,
    .endian = RZ_SYS_ENDIAN_LITTLE,
    .desc = "Axis Communications 32-bit embedded processor",
    .disassemble = &disassemble
};
 
#ifndef RZ_PLUGIN_INCORE
RZ_API RzLibStruct rizin_plugin = {
    .type = RZ_LIB_TYPE_ASM,
    .data = &rz_asm_plugin_cris_gnu,
    .version = RZ_VERSION
};
#endif