unicorn/tests/regress/threaded_emu_start.c

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/*
Test for uc_open() and uc_emu_start() being called by different threads.
This code will call uc_open() in the main thread and then attempt
to call uc_emu_start() from its own thread. This would enable the emulator
to run in the background while you do other things like handle user interface
etc in the foreground.
Currently "uc->qemu_global_mutex" is locked by uc_open() and unlocked
by uc_emu_start(). This is a problem because the mutex implementation
must be locked and unlocked by the same thread. This means that uc_open()
and uc_emu_start() must be executed in the same thread. This is an unnecessary
limitation which prevents the emulator from being able to be executed in the
background.
*/
// windows specific
#ifdef _MSC_VER
#include <io.h>
#include <windows.h>
#include <process.h>
#define PRIx64 "llX"
#ifdef DYNLOAD
#include <unicorn_dynload.h>
#else // DYNLOAD
#include <unicorn/unicorn.h>
#ifdef _WIN64
#pragma comment(lib, "unicorn_staload64.lib")
#else // _WIN64
#pragma comment(lib, "unicorn_staload.lib")
#endif // _WIN64
#endif // DYNLOAD
// posix specific
#else // _MSC_VER
#include <unicorn/unicorn.h>
#include "pthread.h"
#endif // _MSC_VER
// for win32 threads in mingw
#ifdef _WIN32
#include <windows.h>
#endif
// common includes
#include <string.h>
// Test MIPS little endian code.
// This should loop forever.
const uint64_t addr = 0x100000;
const unsigned char loop_test_code[] = {
0x02,0x00,0x04,0x24, // 100000: li $a0, 2
// loop1
0x00,0x00,0x00,0x00, // 100004: nop
0xFE,0xFF,0x80,0x14, // 100008: bnez $a0, loop1
0x00,0x00,0x00,0x00, // 10000C: nop
};
bool test_passed_ok = false;
int loop_count = 0;
// This hook is used to show that code is executing in the emulator.
static void mips_codehook(uc_engine *uc, uint64_t address, uint32_t size, void *user_data)
{
printf("Code: %"PRIx64"\n", address);
}
typedef struct {
uc_engine *uc;
uint64_t startAddr;
uint64_t endAddr;
} EmuStarterParam_t;
// This is a thread that just runs uc_emu_start() in it.
// The code that it is executing in this case will run forever until it is stopped by uc_emu_stop().
static uc_err emu_starter(void* param)
{
uc_engine *uc;
uint64_t start_addr;
uint64_t end_addr;
uc_err err;
EmuStarterParam_t* starter_params = (EmuStarterParam_t *)param;
uc = starter_params->uc;
start_addr = starter_params->startAddr;
end_addr = starter_params->endAddr;
printf("uc_emu_start()\n");
err = uc_emu_start(uc, start_addr, end_addr, 0, 0);
if (err)
{
printf("Failed on uc_emu_start() with error returned %u: %s\n",
err, uc_strerror(err));
}
return err;
}
#ifdef _WIN32
static unsigned int __stdcall win32_emu_starter(void* param)
{
uc_err err = emu_starter(param);
_endthreadex(err);
return err;
}
#else
static void* posix_emu_starter(void* param)
{
uc_err err = emu_starter(param);
return (void*)err;
}
#endif
int main(int argc, char **argv, char **envp)
{
uc_engine *uc;
uc_err err;
int ret;
uc_hook hhc;
uint32_t val;
EmuStarterParam_t starter_params;
#ifdef _WIN32
HANDLE th = (HANDLE)-1;
#else
pthread_t th;
#endif
// dynamically load shared library
#ifdef DYNLOAD
uc_dyn_load(NULL, 0);
#endif
// Initialize emulator in MIPS 32bit little endian mode
printf("uc_open()\n");
err = uc_open(UC_ARCH_MIPS, UC_MODE_MIPS32, &uc);
if (err)
{
printf("Failed on uc_open() with error returned: %u\n", err);
return err;
}
// map in a page of mem
printf("uc_mem_map()\n");
err = uc_mem_map(uc, addr, 0x1000, UC_PROT_ALL);
if (err)
{
printf("Failed on uc_mem_map() with error returned: %u\n", err);
return err;
}
// write machine code to be emulated to memory
printf("uc_mem_write()\n");
err = uc_mem_write(uc, addr, loop_test_code, sizeof(loop_test_code));
if( err )
{
printf("Failed on uc_mem_write() with error returned: %u\n", err);
return err;
}
// hook all instructions by having @begin > @end
printf("uc_hook_add()\n");
uc_hook_add(uc, &hhc, UC_HOOK_CODE, mips_codehook, NULL, 1, 0);
if( err )
{
printf("Failed on uc_hook_add(code) with error returned: %u\n", err);
return err;
}
// start background thread
printf("---- Thread Starting ----\n");
starter_params.uc = uc;
starter_params.startAddr = addr;
starter_params.endAddr = addr + sizeof(loop_test_code);
#ifdef _WIN32
// create thread
th = (HANDLE)_beginthreadex(NULL, 0, win32_emu_starter, &starter_params, CREATE_SUSPENDED, NULL);
if(th == (HANDLE)-1)
{
printf("Failed on _beginthreadex() with error returned: %p\n", _errno());
return -1;
}
// start thread
ret = ResumeThread(th);
if( ret == -1 )
{
printf("Failed on ResumeThread() with error returned: %p\n", _errno());
return -2;
}
// wait 3 seconds
Sleep(3 * 1000);
#else
// add posix code to start the emu_starter() thread
ret = pthread_create(&th, NULL, posix_emu_starter, &starter_params);
if( ret )
{
printf("Failed on pthread_create() with error returned: %u\n", err);
return -2;
}
// wait 3 seconds
sleep(3);
#endif
// Stop the thread after it has been let to run in the background for a while
printf("---- Thread Stopping ----\n");
printf("uc_emu_stop()\n");
err = uc_emu_stop(uc);
if( err )
{
printf("Failed on uc_emu_stop() with error returned: %u\n", err);
return err;
}
test_passed_ok = true;
// done executing, print some reg values as a test
uc_reg_read(uc, UC_MIPS_REG_PC, &val); printf("pc is %X\n", val);
uc_reg_read(uc, UC_MIPS_REG_A0, &val); printf("a0 is %X\n", val);
// free resources
printf("uc_close()\n");
uc_close(uc);
if( test_passed_ok )
printf("\n\nTEST PASSED!\n\n");
else
printf("\n\nTEST FAILED!\n\n");
// dynamically free shared library
#ifdef DYNLOAD
uc_dyn_free();
#endif
return 0;
}