analysis_nios2.c

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// SPDX-FileCopyrightText: 2014 pancake <pancake@nopcode.org>
// SPDX-License-Identifier: LGPL-3.0-only
 
#include <string.h>
#include <rz_types.h>
#include <rz_lib.h>
#include <rz_asm.h>
#include <rz_analysis.h>
 
static int nios2_op(RzAnalysis *analysis, RzAnalysisOp *op, ut64 addr, const ut8 *b, int len, RzAnalysisOpMask mask) {
    if (!op) {
        return 1;
    }
    op->size = 4;
 
    if ((b[0] & 0xff) == 0x3a) {
        // XXX
        op->type = RZ_ANALYSIS_OP_TYPE_RET;
    } else if ((b[0] & 0xf) == 0xa) {
        op->type = RZ_ANALYSIS_OP_TYPE_JMP;
    } else if ((b[0] & 0xf) == 4) {
        op->type = RZ_ANALYSIS_OP_TYPE_ADD;
    } else if ((b[0] & 0xf) == 5) {
        op->type = RZ_ANALYSIS_OP_TYPE_STORE;
    } else if ((b[0] & 0xf) == 6) {
        // blt, r19, r5, 0x8023480
        op->type = RZ_ANALYSIS_OP_TYPE_CJMP;
        // TODO: address
    } else if ((b[0] & 0xf) == 7) {
        // blt, r19, r5, 0x8023480
        op->type = RZ_ANALYSIS_OP_TYPE_LOAD;
        // TODO: address
    } else {
        switch (b[0]) {
        case 0x3a:
            if (b[1] >= 0xa0 && b[1] <= 0xaf && b[3] == 0x3d) {
                op->type = RZ_ANALYSIS_OP_TYPE_TRAP;
            } else if ((b[1] >= 0xe0 && b[1] <= 0xe7) && b[2] == 0x3e && !b[3]) {
                // nextpc ra
                op->type = RZ_ANALYSIS_OP_TYPE_RET;
            }
            break;
        case 0x01:
            // jmpi
            op->type = RZ_ANALYSIS_OP_TYPE_JMP;
            break;
        case 0x00:
        case 0x20:
        case 0x40:
        case 0x80:
        case 0xc0:
            //
            op->type = RZ_ANALYSIS_OP_TYPE_CALL;
            break;
        case 0x26:
            // beq
            break;
        case 0x07:
        case 0x47:
        case 0x87:
        case 0xc7:
            // ldb
            op->type = RZ_ANALYSIS_OP_TYPE_LOAD;
            break;
        case 0x0d:
        case 0x2d:
        case 0x4d:
        case 0x8d:
        case 0xcd:
            // sth && sthio
            op->type = RZ_ANALYSIS_OP_TYPE_LOAD;
            break;
        case 0x06:
        case 0x46:
        case 0x86:
        case 0xc6:
            // br
            op->type = RZ_ANALYSIS_OP_TYPE_CALL;
            break;
        }
    }
    return op->size;
}
 
RzAnalysisPlugin rz_analysis_plugin_nios2 = {
    .name = "nios2",
    .desc = "NIOS II code analysis plugin",
    .license = "LGPL3",
    .arch = "nios2",
    .esil = false,
    .bits = 32,
    .op = &nios2_op,
};
 
#ifndef RZ_PLUGIN_INCORE
RZ_API RzLibStruct rizin_plugin = {
    .type = RZ_LIB_TYPE_ANALYSIS,
    .data = &rz_analysis_plugin_nios2,
    .version = RZ_VERSION
};
#endif