Added test for uc_open() and uc_emu_start() being called by different threads.

tests/regress/Makefile

@@ -31,6 +31,7 @@ TESTS += sparc_jump_to_zero
 TESTS += mips_delay_slot_code_hook
 TESTS += mem_nofree
 TESTS += rw_hookstack
+TESTS += threaded_emu_start
 
 all: $(TESTS)
 

tests/regress/threaded_emu_start.c

@@ -0,0 +1,243 @@
+/*
+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 <unistd.h>
+#include <inttypes.h>
+#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: %llX\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, (uint64_t)1, (uint64_t)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: %u\n", _errno());
+		return -1;
+	}
+	// start thread
+	ret = ResumeThread(th);
+	if( ret == -1 )
+	{
+		printf("Failed on ResumeThread() with error returned: %u\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;
+}
+