runtime/race: add race detector support for linux/riscv64

This enables support for the race detector on linux/riscv64.

Fixes golang#64345

Cq-Include-Trybots: luci.golang.try:gotip-linux-riscv64
Change-Id: I98962827e91455404858549b0f9691ee438f104b
Reviewed-on: https://go-review.googlesource.com/c/go/+/690497
Reviewed-by: Cherry Mui <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Meng Zhuo <[email protected]>
Reviewed-by: Carlos Amedee <[email protected]>

Author: 4a6f656c

src/cmd/dist/test.go

@@ -1698,7 +1698,7 @@ func (t *tester) makeGOROOTUnwritable() (undo func()) {
 func raceDetectorSupported(goos, goarch string) bool {
 	switch goos {
 	case "linux":
-		return goarch == "amd64" || goarch == "ppc64le" || goarch == "arm64" || goarch == "s390x" || goarch == "loong64"
+		return goarch == "amd64" || goarch == "arm64" || goarch == "loong64" || goarch == "ppc64le" || goarch == "riscv64" || goarch == "s390x"
 	case "darwin":
 		return goarch == "amd64" || goarch == "arm64"
 	case "freebsd", "netbsd", "windows":

src/cmd/go/alldocs.go

@@ -77,8 +77,9 @@ and test commands:
 		The default is GOMAXPROCS, normally the number of CPUs available.
 	-race
 		enable data race detection.
-		Supported only on linux/amd64, freebsd/amd64, darwin/amd64, darwin/arm64, windows/amd64,
-		linux/ppc64le and linux/arm64 (only for 48-bit VMA).
+		Supported only on darwin/amd64, darwin/arm64, freebsd/amd64, linux/amd64,
+		linux/arm64 (only for 48-bit VMA), linux/ppc64le, linux/riscv64 and
+		windows/amd64.
 	-msan
 		enable interoperation with memory sanitizer.
 		Supported only on linux/amd64, linux/arm64, linux/loong64, freebsd/amd64

src/cmd/go/internal/work/build.go

@@ -23,7 +23,7 @@ func (p OSArch) String() string {
 func RaceDetectorSupported(goos, goarch string) bool {
 	switch goos {
 	case "linux":
-		return goarch == "amd64" || goarch == "ppc64le" || goarch == "arm64" || goarch == "s390x" || goarch == "loong64"
+		return goarch == "amd64" || goarch == "arm64" || goarch == "loong64" || goarch == "ppc64le" || goarch == "riscv64" || goarch == "s390x"
 	case "darwin":
 		return goarch == "amd64" || goarch == "arm64"
 	case "freebsd", "netbsd", "windows":

src/internal/platform/supported.go

@@ -9,7 +9,7 @@
 set -e
 
 function usage {
-	echo 'race detector is only supported on linux/amd64, linux/ppc64le, linux/arm64, linux/loong64, linux/s390x, freebsd/amd64, netbsd/amd64, openbsd/amd64, darwin/amd64, and darwin/arm64' 1>&2
+	echo 'race detector is only supported on linux/amd64, linux/ppc64le, linux/arm64, linux/loong64, linux/riscv64, linux/s390x, freebsd/amd64, netbsd/amd64, openbsd/amd64, darwin/amd64, and darwin/arm64' 1>&2
 	exit 1
 }
 
@@ -20,6 +20,7 @@ case $(uname -s -m) in
   "Linux ppc64le") ;;
   "Linux aarch64") ;;
   "Linux loongarch64") ;;
+  "Linux riscv64") ;;
   "Linux s390x")   ;;
   "FreeBSD amd64") ;;
   "NetBSD amd64")  ;;

src/race.bash

@@ -588,11 +588,20 @@ func mallocinit() {
 			// possible to use RISCV_HWPROBE_KEY_HIGHEST_VIRT_ADDRESS at some
 			// point in the future - for now use the system stack address.
 			vmaSize = sys.Len64(uint64(getg().m.g0.stack.hi)) + 1
+			if raceenabled && vmaSize != 39 && vmaSize != 48 {
+				println("vma size = ", vmaSize)
+				throw("riscv64 vma size is unknown and race mode is enabled")
+			}
 		}
 
 		for i := 0x7f; i >= 0; i-- {
 			var p uintptr
 			switch {
+			case raceenabled && GOARCH == "riscv64" && vmaSize == 39:
+				p = uintptr(i)<<28 | uintptrMask&(0x0013<<28)
+				if p >= uintptrMask&0x000f00000000 {
+					continue
+				}
 			case raceenabled:
 				// The TSAN runtime requires the heap
 				// to be in the range [0x00c000000000,

src/runtime/malloc.go

@@ -15,4 +15,5 @@ race_darwin_arm64.syso built with LLVM 51bfeff0e4b0757ff773da6882f4d538996c9b04
 race_linux_arm64.syso built with LLVM 51bfeff0e4b0757ff773da6882f4d538996c9b04 and Go e7d582b55dda36e76ce4d0ce770139ca0915b7c5.
 race_linux_loong64.syso built with LLVM 83fe85115da9dc25fa270d2ea8140113c8d49670 and Go 037112464b4439571b45536de9ebe4bc9e10ecb7.
 race_linux_ppc64le.syso built with LLVM 51bfeff0e4b0757ff773da6882f4d538996c9b04 and Go e7d582b55dda36e76ce4d0ce770139ca0915b7c5.
+race_linux_riscv64.syso built with LLVM c3c24be13f7928460ca1e2fe613a1146c868854e and Go a21249436b6e1fd47356361d53dc053bbc074f90.
 race_linux_s390x.syso built with LLVM 51bfeff0e4b0757ff773da6882f4d538996c9b04 and Go e7d582b55dda36e76ce4d0ce770139ca0915b7c5.

src/runtime/race/README

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build race && ((linux && (amd64 || arm64 || loong64 || ppc64le || s390x)) || ((freebsd || netbsd || openbsd || windows) && amd64))
+//go:build race && ((linux && (amd64 || arm64 || loong64 || ppc64le || riscv64 || s390x)) || ((freebsd || netbsd || openbsd || windows) && amd64))
 
 package race