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add sample regression code for issue #78

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gaffe 2015-08-29 12:44:29 -07:00
parent 7481f0f0c6
commit be98e28132
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regress/timeout_segfault.c Normal file
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/*
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(uch handle, 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(uch handle, 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)
{
uch handle;
uc_err err;
uch 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, &handle);
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(handle, ADDRESS, 2 * 1024 * 1024, UC_PROT_ALL);
// write machine code to be emulated to memory
uc_mem_write(handle, ADDRESS, (uint8_t *)ARM_CODE, sizeof(ARM_CODE) - 1);
// initialize machine registers
uc_reg_write(handle, UC_ARM_REG_R0, &r0);
uc_reg_write(handle, UC_ARM_REG_R2, &r2);
uc_reg_write(handle, UC_ARM_REG_R3, &r3);
// tracing all basic blocks with customized callback
uc_hook_add(handle, &trace1, UC_HOOK_BLOCK, hook_block, NULL, (uint64_t)1, (uint64_t)0);
// tracing one instruction at ADDRESS with customized callback
uc_hook_add(handle, &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(handle, 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(handle, UC_ARM_REG_R0, &r0);
uc_reg_read(handle, UC_ARM_REG_R1, &r1);
printf(">>> R0 = 0x%x\n", r0);
printf(">>> R1 = 0x%x\n", r1);
uc_close(&handle);
}
static void test_thumb(void)
{
uch handle;
uc_err err;
uch 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, &handle);
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(handle, ADDRESS, 2 * 1024 * 1024, UC_PROT_ALL);
// write machine code to be emulated to memory
uc_mem_write(handle, ADDRESS, (uint8_t *)THUMB_CODE, sizeof(THUMB_CODE) - 1);
// initialize machine registers
uc_reg_write(handle, UC_ARM_REG_SP, &sp);
// tracing all basic blocks with customized callback
uc_hook_add(handle, &trace1, UC_HOOK_BLOCK, hook_block, NULL, (uint64_t)1, (uint64_t)0);
// tracing one instruction at ADDRESS with customized callback
uc_hook_add(handle, &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(handle, 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(handle, UC_ARM_REG_SP, &sp);
printf(">>> SP = 0x%x\n", sp);
uc_close(&handle);
}
int main(int argc, char **argv, char **envp)
{
test_arm();
printf("==========================\n");
test_thumb();
return 0;
}