add loongarch64 support for archutil

.github/workflows/validate.yml

@@ -63,6 +63,9 @@ jobs:
 
   archutil-arm64:
     runs-on: ubuntu-22.04
+    # TODO: enable when binutils-loongarch64-linux-gnu pkg is available for aarch64 arch
+    # https://github.com/moby/buildkit/pull/4392#issuecomment-1938223235
+    if: false
     steps:
       -
         name: Checkout

hack/dockerfiles/archutil.Dockerfile

@@ -15,7 +15,8 @@ RUN apt-get update && apt-get --no-install-recommends install -y git binutils \
   binutils-s390x-linux-gnu \
   binutils-powerpc64le-linux-gnu \
   binutils-mips64el-linux-gnuabi64 \
-  binutils-mips64-linux-gnuabi64
+  binutils-mips64-linux-gnuabi64 \
+  binutils-loongarch64-linux-gnu
 WORKDIR /src
 
 FROM base AS exit-amd64
@@ -58,6 +59,10 @@ FROM base AS exit-mips64
 COPY util/archutil/fixtures/exit.mips64.s .
 RUN mips64-linux-gnuabi64-as --noexecstack -o exit.o exit.mips64.s && mips64-linux-gnuabi64-ld -o exit -s exit.o && mips64-linux-gnuabi64-strip --strip-unneeded exit
 
+FROM base AS exit-loong64
+COPY util/archutil/fixtures/exit.loongarch64.s .
+RUN loongarch64-linux-gnu-as --noexecstack -o exit.o exit.loongarch64.s && loongarch64-linux-gnu-ld -o exit -s exit.o && loongarch64-linux-gnu-strip --strip-unneeded exit
+
 FROM scratch AS exits
 COPY --from=exit-amd64 /src/exit amd64
 COPY --from=exit-386 /src/exit 386
@@ -69,6 +74,7 @@ COPY --from=exit-ppc64 /src/exit ppc64
 COPY --from=exit-ppc64le /src/exit ppc64le
 COPY --from=exit-mips64le /src/exit mips64le
 COPY --from=exit-mips64 /src/exit mips64
+COPY --from=exit-loong64 /src/exit loong64
 
 FROM golang:${GO_VERSION}-alpine${ALPINE_VERSION} AS generate
 WORKDIR /go/src/github.com/moby/buildkit
@@ -86,7 +92,8 @@ RUN --mount=type=bind,target=.,rw \
     bin/archutil/ppc64 \
     bin/archutil/ppc64le \
     bin/archutil/mips64le \
-    bin/archutil/mips64
+    bin/archutil/mips64 \
+    bin/archutil/loong64
   tree -nh bin/archutil
   cp bin/archutil/*_binary.go /out
 EOT

util/archutil/detect.go

@@ -78,6 +78,11 @@ func SupportedPlatforms(noCache bool) []ocispecs.Platform {
 			arr = append(arr, linux(p))
 		}
 	}
+	if p := "loong64"; def.Architecture != p {
+		if _, err := loong64Supported(); err == nil {
+			arr = append(arr, linux(p))
+		}
+	}
 	if p := "arm"; def.Architecture != p {
 		if _, err := armSupported(); err == nil {
 			p := linux("arm")
@@ -144,6 +149,11 @@ func WarnIfUnsupported(pfs []ocispecs.Platform) {
 					printPlatformWarning(p, err)
 				}
 			}
+			if p.Architecture == "loong64" {
+				if _, err := loong64Supported(); err != nil {
+					printPlatformWarning(p, err)
+				}
+			}
 			if p.Architecture == "arm" {
 				if _, err := armSupported(); err != nil {
 					printPlatformWarning(p, err)

util/archutil/fixtures/exit.loongarch64.s

@@ -0,0 +1,6 @@
+	.global _start
+	.text
+_start:
+	li.w $a0,0
+	li.w $a7,93
+	syscall 0

util/archutil/loong64_binary.go

@@ -0,0 +1,9 @@
+//go:build !loong64
+// +build !loong64
+
+package archutil
+
+// This file is generated by running "make archutil".
+// Do not edit manually.
+
+const Binaryloong64 = "\x1f\x8b\x08\x00\x00\x00\x00\x00\x02\xff\xaa\x77\xf5\x71\x63\x62\x64\x64\x80\x01\x26\x06\x08\x6f\x03\x03\x83\x02\x88\x76\x80\x8a\x5f\x80\xd2\xce\x60\x31\x0b\x06\x26\x06\x07\x06\x66\x06\x26\x06\x90\x1a\x56\x06\x14\xa0\xc0\x88\x44\xef\x81\x0a\xc2\x68\x98\x81\x81\x4f\x4b\x52\xd8\x18\x88\x07\x02\x50\x9a\x85\x41\x94\x81\xbb\xa4\x91\x99\x81\x41\x9b\x81\x41\xaf\x38\xa3\xb8\xa4\xa8\x24\x31\x89\x41\xaf\x24\xb5\xa2\x84\x81\x0a\x80\x9b\x81\x01\xec\x27\x98\xdb\x60\xe1\xb0\x01\xca\xe7\x41\x53\xcf\x88\x85\xcf\x8c\xc5\x5c\x98\xff\x05\x09\xe8\x07\x04\x00\x00\xff\xff\x5f\xc5\x9b\x9d\x90\x01\x00\x00"

util/archutil/loong64_check.go

@@ -0,0 +1,8 @@
+//go:build !loong64
+// +build !loong64
+
+package archutil
+
+func loong64Supported() (string, error) {
+	return check("loong64", Binaryloong64)
+}

util/archutil/loong64_check_loong64.go

@@ -0,0 +1,7 @@
+//go:build loong64
+
+package archutil
+
+func loong64Supported() (string, error) {
+	return "", nil
+}