Reusable amd64 interpreter for extraction of values from disassembly

asm/amd/.gitignore

@@ -0,0 +1 @@
+testdata/fuzz

asm/amd/insn.go

@@ -2,7 +2,11 @@
 // SPDX-License-Identifier: Apache-2.0
 
 package amd // import "go.opentelemetry.io/ebpf-profiler/asm/amd"
-import "bytes"
+import (
+	"bytes"
+
+	"golang.org/x/arch/x86/x86asm"
+)
 
 // https://www.felixcloutier.com/x86/endbr64
 var opcodeEndBr64 = []byte{0xf3, 0x0f, 0x1e, 0xfa}
@@ -18,3 +22,33 @@ func DecodeSkippable(code []byte) (ok bool, size int) {
 		return false, 0
 	}
 }
+
+func IsJump(op x86asm.Op) bool {
+	switch op {
+	case
+		x86asm.RET,
+		x86asm.JMP,
+		x86asm.JA,
+		x86asm.JAE,
+		x86asm.JB,
+		x86asm.JBE,
+		x86asm.JCXZ,
+		x86asm.JE,
+		x86asm.JECXZ,
+		x86asm.JG,
+		x86asm.JGE,
+		x86asm.JL,
+		x86asm.JLE,
+		x86asm.JNE,
+		x86asm.JNO,
+		x86asm.JNP,
+		x86asm.JNS,
+		x86asm.JO,
+		x86asm.JP,
+		x86asm.JRCXZ,
+		x86asm.JS:
+		return true
+	default:
+		return false
+	}
+}