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/* Unicorn Emulator Engine */
/* By simigo79, 2020 */
/* Sample code to demonstrate how to emulate PPC code */
#include <unicorn/unicorn.h>
#include <string.h>
// code to be emulated
#define PPC_CODE "\x7F\x46\x1A\x14" // add r26, r6, 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_ppc(void)
{
uc_engine *uc;
uc_err err;
uc_hook trace1, trace2;
int r3 = 0x1234; // R3 register
int r6 = 0x6789; // R6 register
int r26 = 0x8877; // R26 register (result)
printf("Emulate PPC code\n");
// Initialize emulator in PPC mode
err = uc_open(UC_ARCH_PPC, UC_MODE_PPC32 | UC_MODE_BIG_ENDIAN, &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, PPC_CODE, sizeof(PPC_CODE) - 1);
// initialize machine registers
uc_reg_write(uc, UC_PPC_REG_3, &r3);
uc_reg_write(uc, UC_PPC_REG_6, &r6);
uc_reg_write(uc, UC_PPC_REG_26, &r26);
// tracing all basic blocks with customized callback
uc_hook_add(uc, &trace1, UC_HOOK_BLOCK, hook_block, NULL, 1, 0);
// tracing one instruction at ADDRESS with customized callback
uc_hook_add(uc, &trace2, UC_HOOK_CODE, hook_code, NULL, ADDRESS, ADDRESS);
// emulate machine code in infinite time (last param = 0), or when
// finishing all the code.
err = uc_emu_start(uc, ADDRESS, ADDRESS + sizeof(PPC_CODE) - 1, 0, 0);
if (err) {
printf("Failed on uc_emu_start() with error returned: %u\n", err);
return;
}
// now print out some registers
printf(">>> Emulation done. Below is the CPU context\n");
uc_reg_read(uc, UC_PPC_REG_26, &r26);
printf(">>> r26 = 0x%x\n", r26);
// close engine when done
uc_close(uc);
}
int main(int argc, char **argv, char **envp)
{
test_ppc();
return 0;
}
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