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/* Unicorn Emulator Engine */
/* By Nguyen Anh Quynh, 2021 */
/* Sample code to demonstrate how to emulate S390X code */
#include <unicorn/unicorn.h>
#include <string.h>
// code to be emulated
#define S390X_CODE "\x18\x23" // lr %r2, %r3
// memory address where emulation starts
#define ADDRESS 0x10000
static void hook_block(uc_engine *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(uc_engine *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_s390x(void)
{
uc_engine *uc;
uc_hook trace1, trace2;
uc_err err;
uint64_t r2 = 2, r3 = 3;
printf("Emulate S390X code\n");
// Initialize emulator in S390X mode
err = uc_open(UC_ARCH_S390X, UC_MODE_BIG_ENDIAN, &uc);
if (err) {
printf("Failed on uc_open() with error returned: %u (%s)\n", err,
uc_strerror(err));
return;
}
// map 1MB memory for this emulation
uc_mem_map(uc, ADDRESS, 1024 * 1024, UC_PROT_ALL);
// write machine code to be emulated to memory
uc_mem_write(uc, ADDRESS, S390X_CODE, sizeof(S390X_CODE) - 1);
// initialize machine registers
uc_reg_write(uc, UC_S390X_REG_R2, &r2);
uc_reg_write(uc, UC_S390X_REG_R3, &r3);
// tracing all basic blocks with customized callback
uc_hook_add(uc, &trace1, UC_HOOK_BLOCK, hook_block, NULL, 1, 0);
// tracing all instruction
uc_hook_add(uc, &trace2, UC_HOOK_CODE, hook_code, NULL, 1, 0);
// emulate machine code in infinite time (last param = 0), or when
// finishing all the code.
err = uc_emu_start(uc, ADDRESS, ADDRESS + sizeof(S390X_CODE) - 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(uc, UC_S390X_REG_R2, &r2);
uc_reg_read(uc, UC_S390X_REG_R3, &r3);
printf(">>> R2 = 0x%" PRIx64 "\t\t>>> R3 = 0x%" PRIx64 "\n", r2, r3);
uc_close(uc);
}
int main(int argc, char **argv, char **envp)
{
test_s390x();
return 0;
}
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