host: add support for linux/loong64

Updates #1338.

Signed-off-by: Guoqi Chen <chenguoqi@loongson.cn>
Co-authored-by: Jiantao Shan <shanjiantao@loongson.cn>

Makefile

@@ -17,6 +17,7 @@ build_test:  ## test only buildable
 	GOOS=linux GOARCH=386 go test ./... | $(BUILD_FAIL_PATTERN)
 	GOOS=linux GOARCH=arm go test ./... | $(BUILD_FAIL_PATTERN)
 	GOOS=linux GOARCH=arm64 go test ./... | $(BUILD_FAIL_PATTERN)
+	GOOS=linux GOARCH=loong64 go test ./... | $(BUILD_FAIL_PATTERN)
 	GOOS=linux GOARCH=riscv64 go test ./... | $(BUILD_FAIL_PATTERN)
 	GOOS=freebsd GOARCH=amd64 go test ./... | $(BUILD_FAIL_PATTERN)
 	GOOS=freebsd GOARCH=386 go test ./... | $(BUILD_FAIL_PATTERN)
@@ -51,6 +52,7 @@ vet:
 	GOOS=linux GOARCH=amd64 go vet ./...
 	GOOS=linux GOARCH=arm64 go vet ./...
 	GOOS=linux GOARCH=arm go vet ./...
+	GOOS=linux GOARCH=loong64 go vet ./...
 	GOOS=linux GOARCH=mips64 go vet ./...
 	GOOS=linux GOARCH=mips64le go vet ./...
 	GOOS=linux GOARCH=mips go vet ./...

host/host_linux_loong64.go

@@ -0,0 +1,48 @@
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs host/types_linux.go
+
+//go:build linux && loong64
+// +build linux,loong64
+
+package host
+
+const (
+	sizeofPtr      = 0x8
+	sizeofShort    = 0x2
+	sizeofInt      = 0x4
+	sizeofLong     = 0x8
+	sizeofLongLong = 0x8
+	sizeOfUtmp     = 0x190
+)
+
+type (
+	_C_short     int16
+	_C_int       int32
+	_C_long      int64
+	_C_long_long int64
+)
+
+type (
+	utmp struct {
+		Type              int16
+		Pid               int32
+		Line              [32]int8
+		Id                [4]int8
+		User              [32]int8
+		Host              [256]int8
+		Exit              exit_status
+		Session           int64
+		Tv                timeval
+		Addr_v6           [4]int32
+		X__glibc_reserved [20]int8
+		Pad_cgo_0         [4]byte
+	}
+	exit_status struct {
+		Termination int16
+		Exit        int16
+	}
+	timeval struct {
+		Sec  int64
+		Usec int64
+	}
+)