Added MIPS delay slot code hook test.

Tests that the code hook gets called for instructions in the branch delay slot for MIPS cpu.

tests/regress/mips_delay_slot_code_hook.c

@@ -0,0 +1,140 @@
+/*
+Test for code hook being called for instructions in branch delay slot in MIPS cpu.
+See issue https://github.com/unicorn-engine/unicorn/issues/290
+
+The code hook should be called for every instruction executed.
+This test checks that the code hook is correctly called for instructions in branch delay slots.
+In this test the loop check value is decremented inside the branch delay shot.
+This helps to show that the instruction in the branch delay slot is being executed,
+but that the code hook is just not occurring.
+*/
+
+// windows specific
+#ifdef _MSC_VER
+#include <io.h>
+#include <windows.h>
+#define PRIx64 "llX"
+#ifdef DYNLOAD
+#include <unicorn/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>
+#endif // _MSC_VER
+
+// common includes
+#include <string.h>
+
+
+// Test MIPS little endian code.
+// It should loop 3 times before ending.
+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
+	0xFF,0xFF,0x84,0x24,	// 10000C:	addiu   $a0, -1
+};
+bool test_passed_ok = false;
+int loop_count = 0;
+
+
+static void mips_codehook(uc_engine *uc, uint64_t address, uint32_t size, void *user_data)
+{
+	if( address == 0x10000C )
+		test_passed_ok = true;
+	if( address == 0x100004 )
+	{
+		printf("\nloop %d:\n", loop_count);
+		loop_count++;
+	}
+	printf("Code: %llX\n", address);
+}
+
+
+int main(int argc, char **argv, char **envp)
+{
+    uc_engine *uc;
+    uc_err err;
+	uc_hook hhc;
+	uint32_t val;
+
+	// dynamically load shared library
+#ifdef DYNLOAD
+	uc_dyn_load(NULL, 0);
+#endif
+
+	// Initialize emulator in MIPS 32bit little endian mode
+    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
+	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
+    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
+    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;
+    }
+	
+    // execute code
+	printf("---- Executing Code ----\n");
+	err = uc_emu_start(uc, addr, addr + sizeof(loop_test_code), 0, 0);
+    if (err)
+	{
+        printf("Failed on uc_emu_start() with error returned %u: %s\n",
+                err, uc_strerror(err));
+		return err;
+    }
+
+	// done executing, print some reg values as a test
+	printf("---- Execution Complete ----\n\n");
+	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
+	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;
+}
+