add Go README and sample.go

bindings/go/README.md

@@ -0,0 +1,29 @@
+To download/update the Unicorn Go bindings, run:
+
+    go get -u github.com/unicorn-engine/unicorn/bindings/go
+
+A very basic usage example follows
+
+_(Does not handle most errors for brevity. Please see sample.go for a more hygenic example):_
+
+    package main
+
+    import (
+        "fmt"
+        uc "github.com/unicorn-engine/unicorn/bindings/go/unicorn"
+    )
+
+    func main() {
+        mu, _ := uc.NewUnicorn(uc.ARCH_X86, uc.MODE_32)
+        // mov eax, 1234
+        code := []byte{184, 210, 4, 0, 0}
+        mu.MemMap(0x1000, 0x1000)
+        mu.MemWrite(0x1000, code)
+        if err := mu.Start(0x1000, 0x1000+uint64(len(code))); err != nil {
+            panic(err)
+        }
+        eax, _ := mu.RegRead(uc.X86_REG_EAX)
+        fmt.Printf("EAX is now: %d\n", eax)
+    }
+
+An example program exercising far more Unicorn functionality and error handling can be found in sample.go.

bindings/go/sample.go

@@ -0,0 +1,105 @@
+package main
+
+import (
+	"encoding/hex"
+	"fmt"
+	uc "github.com/unicorn-engine/unicorn/bindings/go/unicorn"
+	"strings"
+)
+
+var asm = strings.Join([]string{
+	"48c7c003000000", // mov rax, 3
+	"0f05",           // syscall
+	"48c7c700400000", // mov rdi, 0x4000
+	"488907",         // mov [rdi], rdx
+	"488b07",         // mov rdx, [rdi]
+	"4883c201",       // add rdx, 1
+}, "")
+
+func addHooks(mu uc.Unicorn) {
+	mu.HookAdd(uc.HOOK_BLOCK, func(mu uc.Unicorn, addr uint64, size uint32) {
+		fmt.Printf("Block: 0x%x, 0x%x\n", addr, size)
+	})
+	mu.HookAdd(uc.HOOK_CODE, func(mu uc.Unicorn, addr uint64, size uint32) {
+		fmt.Printf("Code: 0x%x, 0x%x\n", addr, size)
+	})
+	mu.HookAdd(uc.HOOK_MEM_READ|uc.HOOK_MEM_WRITE, func(mu uc.Unicorn, access int, addr uint64, size int, value int64) {
+		if access == uc.MEM_WRITE {
+			fmt.Printf("Mem write")
+		} else {
+			fmt.Printf("Mem read")
+		}
+		fmt.Printf(": @0x%x, 0x%x = 0x%x\n", addr, size, value)
+	})
+	invalid := uc.HOOK_MEM_READ_INVALID | uc.HOOK_MEM_WRITE_INVALID | uc.HOOK_MEM_FETCH_INVALID
+	mu.HookAdd(invalid, func(mu uc.Unicorn, access int, addr uint64, size int, value int64) bool {
+		switch access {
+		case uc.MEM_WRITE_INVALID:
+			fmt.Printf("invalid write")
+		case uc.MEM_READ_INVALID:
+			fmt.Printf("invalid read")
+		case uc.MEM_FETCH_INVALID:
+			fmt.Printf("invalid fetch")
+		default:
+			fmt.Printf("unknown memory error")
+		}
+		fmt.Printf(": @0x%x, 0x%x = 0x%x\n", addr, size, value)
+		return false
+	})
+	mu.HookAdd(uc.HOOK_INSN, func(mu uc.Unicorn) {
+		rax, _ := mu.RegRead(uc.X86_REG_RAX)
+		fmt.Printf("Syscall: %d\n", rax)
+	}, uc.X86_INS_SYSCALL)
+}
+
+func run() error {
+	code, err := hex.DecodeString(asm)
+	if err != nil {
+		return err
+	}
+	// set up unicorn instance and add hooks
+	mu, err := uc.NewUnicorn(uc.ARCH_X86, uc.MODE_64)
+	if err != nil {
+		return err
+	}
+	addHooks(mu)
+	// map and write code to memory
+	if err := mu.MemMap(0x1000, 0x1000); err != nil {
+		return err
+	}
+	if err := mu.MemWrite(0x1000, code); err != nil {
+		return err
+	}
+	// map scratch space
+	if err := mu.MemMap(0x4000, 0x1000); err != nil {
+		return err
+	}
+	// set example register
+	if err := mu.RegWrite(uc.X86_REG_RDX, 1); err != nil {
+		return err
+	}
+	rdx, err := mu.RegRead(uc.X86_REG_RDX)
+	if err != nil {
+		return err
+	}
+	fmt.Printf("RDX is: %d\n", rdx)
+
+	// start emulation
+	if err := mu.Start(0x1000, 0x1000+uint64(len(code))); err != nil {
+		return err
+	}
+
+	// read back example register
+	rdx, err = mu.RegRead(uc.X86_REG_RDX)
+	if err != nil {
+		return err
+	}
+	fmt.Printf("RDX is now: %d\n", rdx)
+	return nil
+}
+
+func main() {
+	if err := run(); err != nil {
+		fmt.Println(err)
+	}
+}