armeb: add C sample for armeb.

bindings/python/sample_armeb.py

@@ -1,6 +1,5 @@
 #!/usr/bin/env python
-# Sample code for ARM of Unicorn. Nguyen Anh Quynh <aquynh@gmail.com>
-# Python sample ported by Loi Anh Tuan <loianhtuan@gmail.com>
+# Sample code for ARM big endian of Unicorn. zhangwm <rustydaar@gmail.com>
 
 from __future__ import print_function
 from unicorn import *

samples/sample_armeb.c

@@ -0,0 +1,176 @@
+/* Unicorn Emulator Engine */
+/* By zhangwm, 2017 */
+
+/* Sample code to demonstrate how to emulate ARM code */
+
+// windows specific
+#ifdef _MSC_VER
+#include <io.h>
+#include <windows.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>
+#endif // _MSC_VER
+
+
+// code to be emulated
+#define ARM_CODE "\xe3\xa0\x00\x37\xe0\x42\x10\x03" // mov r0, #0x37; sub r1, r2, r3
+#define THUMB_CODE "\xb0\x83" // sub    sp, #0xc
+
+// 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_arm(void)
+{
+    uc_engine *uc;
+    uc_err err;
+    uc_hook trace1, trace2;
+
+    int r0 = 0x1234;     // R0 register
+    int r2 = 0x6789;     // R1 register
+    int r3 = 0x3333;     // R2 register
+    int r1;     // R1 register
+
+    printf("Emulate ARM code\n");
+
+    // Initialize emulator in ARM mode
+    err = uc_open(UC_ARCH_ARM, UC_MODE_ARM + 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, ARM_CODE, sizeof(ARM_CODE) - 1);
+
+    // initialize machine registers
+    uc_reg_write(uc, UC_ARM_REG_R0, &r0);
+    uc_reg_write(uc, UC_ARM_REG_R2, &r2);
+    uc_reg_write(uc, UC_ARM_REG_R3, &r3);
+
+    // 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(ARM_CODE) -1, 0, 0);
+    if (err) {
+        printf("Failed on uc_emu_start() with error returned: %u\n", err);
+    }
+
+    // now print out some registers
+    printf(">>> Emulation done. Below is the CPU context\n");
+
+    uc_reg_read(uc, UC_ARM_REG_R0, &r0);
+    uc_reg_read(uc, UC_ARM_REG_R1, &r1);
+    printf(">>> R0 = 0x%x\n", r0);
+    printf(">>> R1 = 0x%x\n", r1);
+
+    uc_close(uc);
+}
+
+static void test_thumb(void)
+{
+    uc_engine *uc;
+    uc_err err;
+    uc_hook trace1, trace2;
+
+    int sp = 0x1234;     // R0 register
+
+    printf("Emulate THUMB code\n");
+
+    // Initialize emulator in ARM mode
+    err = uc_open(UC_ARCH_ARM, UC_MODE_THUMB + 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, THUMB_CODE, sizeof(THUMB_CODE) - 1);
+
+    // initialize machine registers
+    uc_reg_write(uc, UC_ARM_REG_SP, &sp);
+
+    // 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.
+    // Note we start at ADDRESS | 1 to indicate THUMB mode.
+    err = uc_emu_start(uc, ADDRESS | 1, ADDRESS + sizeof(THUMB_CODE) -1, 0, 0);
+    if (err) {
+        printf("Failed on uc_emu_start() with error returned: %u\n", err);
+    }
+
+    // now print out some registers
+    printf(">>> Emulation done. Below is the CPU context\n");
+
+    uc_reg_read(uc, UC_ARM_REG_SP, &sp);
+    printf(">>> SP = 0x%x\n", sp);
+
+    uc_close(uc);
+}
+
+int main(int argc, char **argv, char **envp)
+{
+	// dynamically load shared library
+#ifdef DYNLOAD
+    if (!uc_dyn_load(NULL, 0)) {
+        printf("Error dynamically loading shared library.\n");
+        printf("Please check that unicorn.dll/unicorn.so is available as well as\n");
+        printf("any other dependent dll/so files.\n");
+        printf("The easiest way is to place them in the same directory as this app.\n");
+        return 1;
+    }
+#endif
+    
+	test_arm();
+    printf("==========================\n");
+    test_thumb();
+
+    // dynamically free shared library
+#ifdef DYNLOAD
+    uc_dyn_free();
+#endif
+    
+    return 0;
+}