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samples: add sample code for hooking SYSCALL instruction in sample_x86.c

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Nguyen Anh Quynh 2015-08-29 00:22:11 +08:00
parent 162728c1b1
commit d3de7aa567
1 changed files with 66 additions and 0 deletions
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66
samples/sample_x86.c
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@ -26,6 +26,7 @@
//#define X86_CODE64 "\x41\xBC\x3B\xB0\x28\x2A\x49\x0F\xC9\x90\x4D\x0F\xAD\xCF\x49\x87\xFD\x90\x48\x81\xD2\x8A\xCE\x77\x35\x48\xF7\xD9"
#define X86_CODE64 "\x41\xBC\x3B\xB0\x28\x2A\x49\x0F\xC9\x90\x4D\x0F\xAD\xCF\x49\x87\xFD\x90\x48\x81\xD2\x8A\xCE\x77\x35\x48\xF7\xD9\x4D\x29\xF4\x49\x81\xC9\xF6\x8A\xC6\x53\x4D\x87\xED\x48\x0F\xAD\xD2\x49\xF7\xD4\x48\xF7\xE1\x4D\x19\xC5\x4D\x89\xC5\x48\xF7\xD6\x41\xB8\x4F\x8D\x6B\x59\x4D\x87\xD0\x68\x6A\x1E\x09\x3C\x59"
#define X86_CODE16 "\x00\x00" // add byte ptr [bx + si], al
#define X86_CODE64_SYSCALL "\x0f\x05" // SYSCALL
// memory address where emulation starts
#define ADDRESS 0x1000000
@ -152,6 +153,19 @@ static void hook_out(uch handle, uint32_t port, int size, uint32_t value, void *
printf("--- register value = 0x%x\n", tmp);
}
// callback for SYSCALL instruction (X86).
static void hook_syscall(uch handle, void *user_data)
{
uint64_t rax;
uc_reg_read(handle, UC_X86_REG_RAX, &rax);
if (rax == 0x100) {
rax = 0x200;
uc_reg_write(handle, UC_X86_REG_RAX, &rax);
} else
printf("ERROR: was not expecting rax=0x%"PRIx64 " in syscall\n", rax);
}
static void test_i386(void)
{
uch handle;
@ -673,6 +687,57 @@ static void test_x86_64(void)
uc_close(&handle);
}
static void test_x86_64_syscall(void)
{
uch handle;
uch trace1;
uc_err err;
int64_t rax = 0x100;
printf("===================================\n");
printf("Emulate x86_64 code with 'syscall' instruction\n");
// Initialize emulator in X86-64bit mode
err = uc_open(UC_ARCH_X86, UC_MODE_64, &handle);
if (err) {
printf("Failed on uc_open() with error returned: %u\n", err);
return;
}
// map 2MB memory for this emulation
uc_mem_map(handle, ADDRESS, 2 * 1024 * 1024);
// write machine code to be emulated to memory
if (uc_mem_write(handle, ADDRESS, (uint8_t *)X86_CODE64_SYSCALL, sizeof(X86_CODE64_SYSCALL) - 1)) {
printf("Failed to write emulation code to memory, quit!\n");
return;
}
// hook interrupts for syscall
uc_hook_add(handle, &trace1, UC_HOOK_INSN, hook_syscall, NULL, UC_X86_INS_SYSCALL);
// initialize machine registers
uc_reg_write(handle, UC_X86_REG_RAX, &rax);
// emulate machine code in infinite time (last param = 0), or when
// finishing all the code.
err = uc_emu_start(handle, ADDRESS, ADDRESS + sizeof(X86_CODE64_SYSCALL) - 1, 0, 0);
if (err) {
printf("Failed on uc_emu_start() with error returned %u: %s\n",
err, uc_strerror(err));
}
// now print out some registers
printf(">>> Emulation done. Below is the CPU context\n");
uc_reg_read(handle, UC_X86_REG_RAX, &rax);
printf(">>> RAX = 0x%" PRIx64 "\n", rax);
uc_close(&handle);
}
static void test_x86_16(void)
{
uch handle;
@ -741,6 +806,7 @@ int main(int argc, char **argv, char **envp)
if (!strcmp(argv[1], "-64")) {
test_x86_64();
test_x86_64_syscall();
}
if (!strcmp(argv[1], "-16")) {