91 lines
2.5 KiB
C
91 lines
2.5 KiB
C
/* Unicorn Emulator Engine */
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/* By simigo79, 2020 */
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/* Sample code to demonstrate how to emulate PPC code */
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#include <unicorn/unicorn.h>
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#include <string.h>
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// code to be emulated
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#define PPC_CODE "\x7F\x46\x1A\x14" // add r26, r6, r3
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// memory address where emulation starts
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#define ADDRESS 0x10000
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static void hook_block(uc_engine *uc, uint64_t address, uint32_t size,
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void *user_data)
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{
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printf(">>> Tracing basic block at 0x%" PRIx64 ", block size = 0x%x\n",
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address, size);
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}
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static void hook_code(uc_engine *uc, uint64_t address, uint32_t size,
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void *user_data)
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{
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printf(">>> Tracing instruction at 0x%" PRIx64
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", instruction size = 0x%x\n",
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address, size);
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}
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static void test_ppc(void)
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{
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uc_engine *uc;
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uc_err err;
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uc_hook trace1, trace2;
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int r3 = 0x1234; // R3 register
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int r6 = 0x6789; // R6 register
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int r26 = 0x8877; // R26 register (result)
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printf("Emulate PPC code\n");
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// Initialize emulator in PPC mode
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err = uc_open(UC_ARCH_PPC, UC_MODE_PPC32 | 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", err,
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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, UC_PROT_ALL);
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// write machine code to be emulated to memory
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uc_mem_write(uc, ADDRESS, PPC_CODE, sizeof(PPC_CODE) - 1);
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// initialize machine registers
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uc_reg_write(uc, UC_PPC_REG_3, &r3);
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uc_reg_write(uc, UC_PPC_REG_6, &r6);
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uc_reg_write(uc, UC_PPC_REG_26, &r26);
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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, 1, 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, ADDRESS, 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(PPC_CODE) - 1, 0, 0);
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if (err) {
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printf("Failed on uc_emu_start() with error returned: %u\n", err);
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return;
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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_PPC_REG_26, &r26);
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printf(">>> r26 = 0x%x\n", r26);
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// close engine when done
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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_ppc();
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return 0;
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}
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