add sample regression code for issue #78
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gaffe
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/*
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timeout_segfault.c
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This program shows a case where the emulation timer keeps running after
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emulation has ended. It triggers an intermittent segfault when _timeout_fn()
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tries to call uc_emu_stop() after emulation has already been cleaned up. This
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code is the same as samples/sample_arm.c, except that it adds a timeout on each
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call to uc_emu_start(). See issue #78 for more details:
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https://github.com/unicorn-engine/unicorn/issues/78
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*/
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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 ARM_CODE "\x37\x00\xa0\xe3\x03\x10\x42\xe0" // mov r0, #0x37; sub r1, r2, r3
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#define THUMB_CODE "\x83\xb0" // sub sp, #0xc
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// memory address where emulation starts
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#define ADDRESS 0x10000
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// number of seconds to wait before timeout
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#define TIMEOUT 5
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static void hook_block(uch handle, 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(uch handle, 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_arm(void)
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{
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uch handle;
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uc_err err;
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uch trace1, trace2;
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int r0 = 0x1234; // R0 register
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int r2 = 0x6789; // R1 register
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int r3 = 0x3333; // R2 register
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int r1; // R1 register
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printf("Emulate ARM code\n");
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// Initialize emulator in ARM mode
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err = uc_open(UC_ARCH_ARM, UC_MODE_ARM, &handle);
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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(handle, 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(handle, ADDRESS, (uint8_t *)ARM_CODE, sizeof(ARM_CODE) - 1);
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// initialize machine registers
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uc_reg_write(handle, UC_ARM_REG_R0, &r0);
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uc_reg_write(handle, UC_ARM_REG_R2, &r2);
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uc_reg_write(handle, UC_ARM_REG_R3, &r3);
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// tracing all basic blocks with customized callback
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uc_hook_add(handle, &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(handle, &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(handle, ADDRESS, ADDRESS + sizeof(ARM_CODE) -1, UC_SECOND_SCALE * TIMEOUT, 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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}
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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(handle, UC_ARM_REG_R0, &r0);
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uc_reg_read(handle, UC_ARM_REG_R1, &r1);
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printf(">>> R0 = 0x%x\n", r0);
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printf(">>> R1 = 0x%x\n", r1);
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uc_close(&handle);
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}
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static void test_thumb(void)
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{
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uch handle;
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uc_err err;
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uch trace1, trace2;
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int sp = 0x1234; // R0 register
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printf("Emulate THUMB code\n");
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// Initialize emulator in ARM mode
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err = uc_open(UC_ARCH_ARM, UC_MODE_THUMB, &handle);
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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(handle, 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(handle, ADDRESS, (uint8_t *)THUMB_CODE, sizeof(THUMB_CODE) - 1);
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// initialize machine registers
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uc_reg_write(handle, UC_ARM_REG_SP, &sp);
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// tracing all basic blocks with customized callback
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uc_hook_add(handle, &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(handle, &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(handle, ADDRESS, ADDRESS + sizeof(THUMB_CODE) -1, UC_SECOND_SCALE * TIMEOUT, 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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}
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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(handle, UC_ARM_REG_SP, &sp);
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printf(">>> SP = 0x%x\n", sp);
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uc_close(&handle);
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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_arm();
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printf("==========================\n");
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test_thumb();
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return 0;
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}
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