feat(verify): ABI checks on arm64, riscv64 and loong64

Assisted-by: GLM 5.3 Flash

cmd/gasm/main.go

@@ -185,6 +185,22 @@ func newCommand(name, usageLine, long string) *flag.FlagSet {
 }
 
 // readSource returns the contents of path, or stdin when path is "-".
+// hostArch maps the running GOARCH onto the arch package's identifiers.
+// It returns arch.Unknown on hosts the toolkit cannot JIT for.
+func hostArch() arch.Arch {
+	switch runtime.GOARCH {
+	case "amd64":
+		return arch.AMD64
+	case "arm64":
+		return arch.ARM64
+	case "riscv64":
+		return arch.RISCV
+	case "loong64":
+		return arch.LOONG64
+	}
+	return arch.Unknown
+}
+
 func readSource(path string) (string, error) {
 	if path == "-" {
 		b, err := io.ReadAll(os.Stdin)
@@ -1065,21 +1081,26 @@ decoders) that crash on random input but should succeed on valid data.
 	}
 	path := set.Arg(0)
 	targetArch := arch.FromFilename(path)
-	switch targetArch {
-	case arch.AMD64:
-		// JIT-based verification below.
-	case arch.RISCV:
-		// RISC-V: ground-truth only (no JIT on non-RISC-V hosts).
-		return cmdVerifyRISCV(path, *groundTruth, *profile)
-	case arch.LOONG64:
-		// LoongArch: ground-truth only (no JIT on non-LoongArch hosts).
-		return cmdVerifyLOONG64(path, *groundTruth, *profile)
-	case arch.ARM64:
-		// AArch64: ground-truth only (no JIT on non-ARM64 hosts).
-		return cmdVerifyARM64(path, *groundTruth, *profile)
-	default:
-		fmt.Fprintln(os.Stderr, "gasm verify: unsupported architecture")
-		return 1
+	// JIT execution requires the host CPU to match the kernel's
+	// architecture; on any other host only the toolchain comparisons run.
+	if targetArch != hostArch() {
+		switch targetArch {
+		case arch.RISCV:
+			// RISC-V: ground-truth only (no JIT on non-RISC-V hosts).
+			return cmdVerifyRISCV(path, *groundTruth, *profile)
+		case arch.LOONG64:
+			// LoongArch: ground-truth only (no JIT on non-LoongArch hosts).
+			return cmdVerifyLOONG64(path, *groundTruth, *profile)
+		case arch.ARM64:
+			// AArch64: ground-truth only (no JIT on non-ARM64 hosts).
+			return cmdVerifyARM64(path, *groundTruth, *profile)
+		case arch.AMD64:
+			fmt.Fprintln(os.Stderr, "gasm verify: JIT-based checks need an amd64 host; use --ground-truth here")
+			return 1
+		default:
+			fmt.Fprintln(os.Stderr, "gasm verify: unsupported architecture")
+			return 1
+		}
 	}
 
 	k, err := verify.Load(path)