134 lines
4.0 KiB
C
134 lines
4.0 KiB
C
/* Unicorn Emulator Engine */
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/* By Nguyen Anh Quynh, 2015 */
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/* Sample code to demonstrate how to emulate Mips code (big endian) */
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#include <inttypes.h>
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#include <unicorn/unicorn.h>
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// code to be emulated
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#define MIPS_CODE_EB "\x34\x21\x34\x56" // ori $at, $at, 0x3456;
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#define MIPS_CODE_EL "\x56\x34\x21\x34" // ori $at, $at, 0x3456;
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// memory address where emulation starts
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#define ADDRESS 0x10000
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static void hook_block(struct uc_struct *uc, uint64_t address, uint32_t size, void *user_data)
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{
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printf(">>> Tracing basic block at 0x%"PRIx64 ", block size = 0x%x\n", address, size);
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}
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static void hook_code(struct uc_struct *uc, uint64_t address, uint32_t size, void *user_data)
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{
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printf(">>> Tracing instruction at 0x%"PRIx64 ", instruction size = 0x%x\n", address, size);
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}
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static void test_mips_eb(void)
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{
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struct uc_struct *uc;
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uc_err err;
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uc_hook_h trace1, trace2;
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int r1 = 0x6789; // R1 register
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printf("Emulate MIPS code (big-endian)\n");
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// Initialize emulator in MIPS mode
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err = uc_open(UC_ARCH_MIPS, UC_MODE_MIPS32 + UC_MODE_BIG_ENDIAN, &uc);
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if (err) {
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printf("Failed on uc_open() with error returned: %u (%s)\n",
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err, uc_strerror(err));
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return;
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}
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// map 2MB memory for this emulation
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uc_mem_map(uc, ADDRESS, 2 * 1024 * 1024);
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// write machine code to be emulated to memory
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uc_mem_write(uc, ADDRESS, (uint8_t *)MIPS_CODE_EB, sizeof(MIPS_CODE_EB) - 1);
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// initialize machine registers
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uc_reg_write(uc, UC_MIPS_REG_1, &r1);
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// tracing all basic blocks with customized callback
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uc_hook_add(uc, &trace1, UC_HOOK_BLOCK, hook_block, NULL, (uint64_t)1, (uint64_t)0);
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// tracing one instruction at ADDRESS with customized callback
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uc_hook_add(uc, &trace2, UC_HOOK_CODE, hook_code, NULL, (uint64_t)ADDRESS, (uint64_t)ADDRESS);
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// emulate machine code in infinite time (last param = 0), or when
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// finishing all the code.
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err = uc_emu_start(uc, ADDRESS, ADDRESS + sizeof(MIPS_CODE_EB) - 1, 0, 0);
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if (err) {
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printf("Failed on uc_emu_start() with error returned: %u (%s)\n", err, uc_strerror(err));
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}
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// now print out some registers
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printf(">>> Emulation done. Below is the CPU context\n");
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uc_reg_read(uc, UC_MIPS_REG_1, &r1);
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printf(">>> R1 = 0x%x\n", r1);
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uc_close(uc);
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}
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static void test_mips_el(void)
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{
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struct uc_struct *uc;
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uc_err err;
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uc_hook_h trace1, trace2;
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int r1 = 0x6789; // R1 register
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printf("===========================\n");
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printf("Emulate MIPS code (little-endian)\n");
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// Initialize emulator in MIPS mode
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err = uc_open(UC_ARCH_MIPS, UC_MODE_MIPS32, &uc);
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if (err) {
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printf("Failed on uc_open() with error returned: %u (%s)\n",
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err, uc_strerror(err));
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return;
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}
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// map 2MB memory for this emulation
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uc_mem_map(uc, ADDRESS, 2 * 1024 * 1024);
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// write machine code to be emulated to memory
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uc_mem_write(uc, ADDRESS, (uint8_t *)MIPS_CODE_EL, sizeof(MIPS_CODE_EL) - 1);
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// initialize machine registers
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uc_reg_write(uc, UC_MIPS_REG_1, &r1);
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// tracing all basic blocks with customized callback
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uc_hook_add(uc, &trace1, UC_HOOK_BLOCK, hook_block, NULL, (uint64_t)1, (uint64_t)0);
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// tracing one instruction at ADDRESS with customized callback
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uc_hook_add(uc, &trace2, UC_HOOK_CODE, hook_code, NULL, (uint64_t)ADDRESS, (uint64_t)ADDRESS);
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// emulate machine code in infinite time (last param = 0), or when
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// finishing all the code.
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err = uc_emu_start(uc, ADDRESS, ADDRESS + sizeof(MIPS_CODE_EL) - 1, 0, 0);
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if (err) {
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printf("Failed on uc_emu_start() with error returned: %u (%s)\n", err, uc_strerror(err));
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}
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// now print out some registers
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printf(">>> Emulation done. Below is the CPU context\n");
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uc_reg_read(uc, UC_MIPS_REG_1, &r1);
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printf(">>> R1 = 0x%x\n", r1);
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uc_close(uc);
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}
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int main(int argc, char **argv, char **envp)
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{
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test_mips_eb();
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test_mips_el();
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return 0;
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}
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