add runtime.DataRegion for GOOS=tamago

Author: abarisani

src/runtime/os_tamago_amd64.go

@@ -31,6 +31,12 @@ func TextRegion() (start uint64, end uint64) {
 	return uint64(firstmoduledata.text), uint64(firstmoduledata.etext)
 }
 
+// DataRegion returns the start and end addresses of the physical RAM
+// containing the Go runtime global symbols.
+func DataRegion() (start uint64, end uint64) {
+	return uint64(firstmoduledata.data), uint64(firstmoduledata.enoptrbss)
+}
+
 // CPU returns the CPU name given by the vendor.
 // If the CPU name can not be determined an
 // empty string is returned.

src/runtime/os_tamago_arm.go

@@ -33,6 +33,12 @@ func TextRegion() (start uint32, end uint32) {
 	return uint32(firstmoduledata.text), uint32(firstmoduledata.etext)
 }
 
+// DataRegion returns the start and end addresses of the physical RAM
+// containing the Go runtime global symbols.
+func DataRegion() (start uint32, end uint32) {
+	return uint32(firstmoduledata.data), uint32(firstmoduledata.enoptrbss)
+}
+
 func checkgoarm() {
 	if goarm < 5 || goarm > 7 {
 		print("runtime: tamago requires ARMv5 through ARMv7. Recompile using GOARM=5, GOARM=6 or GOARM=7.\n")

src/runtime/os_tamago_riscv64.go

@@ -28,3 +28,9 @@ func MemRegion() (start uint64, end uint64) {
 func TextRegion() (start uint64, end uint64) {
 	return uint64(firstmoduledata.text), uint64(firstmoduledata.etext)
 }
+
+// DataRegion returns the start and end addresses of the physical RAM
+// containing the Go runtime global symbols.
+func DataRegion() (start uint64, end uint64) {
+	return uint64(firstmoduledata.data), uint64(firstmoduledata.enoptrbss)
+}