/* timeout_segfault.c This program shows a case where the emulation timer keeps running after emulation has ended. It triggers an intermittent segfault when _timeout_fn() tries to call uc_emu_stop() after emulation has already been cleaned up. This code is the same as samples/sample_arm.c, except that it adds a timeout on each call to uc_emu_start(). See issue #78 for more details: https://github.com/unicorn-engine/unicorn/issues/78 */ #include <inttypes.h> #include <unicorn/unicorn.h> // code to be emulated #define ARM_CODE "\x37\x00\xa0\xe3\x03\x10\x42\xe0" // mov r0, #0x37; sub r1, r2, r3 #define THUMB_CODE "\x83\xb0" // sub sp, #0xc // memory address where emulation starts #define ADDRESS 0x10000 // number of seconds to wait before timeout #define TIMEOUT 5 static void hook_block(ucengine *uc, uint64_t address, uint32_t size, void *user_data) { printf(">>> Tracing basic block at 0x%"PRIx64 ", block size = 0x%x\n", address, size); } static void hook_code(ucengine *uc, uint64_t address, uint32_t size, void *user_data) { printf(">>> Tracing instruction at 0x%"PRIx64 ", instruction size = 0x%x\n", address, size); } static void test_arm(void) { ucengine *uc; uc_err err; uchook trace1, trace2; int r0 = 0x1234; // R0 register int r2 = 0x6789; // R1 register int r3 = 0x3333; // R2 register int r1; // R1 register printf("Emulate ARM code\n"); // Initialize emulator in ARM mode err = uc_open(UC_ARCH_ARM, UC_MODE_ARM, &uc); if (err) { printf("Failed on uc_open() with error returned: %u (%s)\n", err, uc_strerror(err)); return; } // map 2MB memory for this emulation uc_mem_map(uc, ADDRESS, 2 * 1024 * 1024, UC_PROT_ALL); // write machine code to be emulated to memory uc_mem_write(uc, ADDRESS, (uint8_t *)ARM_CODE, sizeof(ARM_CODE) - 1); // initialize machine registers uc_reg_write(uc, UC_ARM_REG_R0, &r0); uc_reg_write(uc, UC_ARM_REG_R2, &r2); uc_reg_write(uc, UC_ARM_REG_R3, &r3); // tracing all basic blocks with customized callback uc_hook_add(uc, &trace1, UC_HOOK_BLOCK, hook_block, NULL, (uint64_t)1, (uint64_t)0); // tracing one instruction at ADDRESS with customized callback uc_hook_add(uc, &trace2, UC_HOOK_CODE, hook_code, NULL, (uint64_t)ADDRESS, (uint64_t)ADDRESS); // emulate machine code in infinite time (last param = 0), or when // finishing all the code. err = uc_emu_start(uc, ADDRESS, ADDRESS + sizeof(ARM_CODE) -1, UC_SECOND_SCALE * TIMEOUT, 0); if (err) { printf("Failed on uc_emu_start() with error returned: %u\n", err); } // now print out some registers printf(">>> Emulation done. Below is the CPU context\n"); uc_reg_read(uc, UC_ARM_REG_R0, &r0); uc_reg_read(uc, UC_ARM_REG_R1, &r1); printf(">>> R0 = 0x%x\n", r0); printf(">>> R1 = 0x%x\n", r1); uc_close(uc); } static void test_thumb(void) { ucengine *uc; uc_err err; uchook trace1, trace2; int sp = 0x1234; // R0 register printf("Emulate THUMB code\n"); // Initialize emulator in ARM mode err = uc_open(UC_ARCH_ARM, UC_MODE_THUMB, &uc); if (err) { printf("Failed on uc_open() with error returned: %u (%s)\n", err, uc_strerror(err)); return; } // map 2MB memory for this emulation uc_mem_map(uc, ADDRESS, 2 * 1024 * 1024, UC_PROT_ALL); // write machine code to be emulated to memory uc_mem_write(uc, ADDRESS, (uint8_t *)THUMB_CODE, sizeof(THUMB_CODE) - 1); // initialize machine registers uc_reg_write(uc, UC_ARM_REG_SP, &sp); // tracing all basic blocks with customized callback uc_hook_add(uc, &trace1, UC_HOOK_BLOCK, hook_block, NULL, (uint64_t)1, (uint64_t)0); // tracing one instruction at ADDRESS with customized callback uc_hook_add(uc, &trace2, UC_HOOK_CODE, hook_code, NULL, (uint64_t)ADDRESS, (uint64_t)ADDRESS); // emulate machine code in infinite time (last param = 0), or when // finishing all the code. err = uc_emu_start(uc, ADDRESS, ADDRESS + sizeof(THUMB_CODE) -1, UC_SECOND_SCALE * TIMEOUT, 0); if (err) { printf("Failed on uc_emu_start() with error returned: %u\n", err); } // now print out some registers printf(">>> Emulation done. Below is the CPU context\n"); uc_reg_read(uc, UC_ARM_REG_SP, &sp); printf(">>> SP = 0x%x\n", sp); uc_close(uc); } int main(int argc, char **argv, char **envp) { test_arm(); printf("==========================\n"); test_thumb(); return 0; }