runtime: add address sanitizer support for ppc64le

updates golang#44853

Change-Id: I71905ee1bcb99ce7300bbed2daad3617d2643c53
Reviewed-on: https://go-review.googlesource.com/c/go/+/408814
Reviewed-by: Lynn Boger <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Reviewed-by: Benny Siegert <[email protected]>
Reviewed-by: David Chase <[email protected]>
Run-TryBot: Archana Ravindar <[email protected]>

Author: Archana R

misc/cgo/testsanitizers/cc_test.go

@@ -527,7 +527,7 @@ func mSanSupported(goos, goarch string) bool {
 func aSanSupported(goos, goarch string) bool {
 	switch goos {
 	case "linux":
-		return goarch == "amd64" || goarch == "arm64" || goarch == "riscv64"
+		return goarch == "amd64" || goarch == "arm64" || goarch == "riscv64" || goarch == "ppc64le"
 	default:
 		return false
 	}

src/cmd/dist/test.go

@@ -836,7 +836,7 @@ func (t *tester) registerTests() {
 		if t.supportedBuildmode("plugin") {
 			t.registerTest("testplugin", "../misc/cgo/testplugin", t.goTest(), t.timeout(600), ".")
 		}
-		if gohostos == "linux" && goarch == "amd64" {
+		if gohostos == "linux" && (goarch == "amd64" || goarch == "ppc64le") {
 			t.registerTest("testasan", "../misc/cgo/testasan", "go", "run", ".")
 		}
 		if goos == "linux" {

src/cmd/internal/sys/supported.go

@@ -40,7 +40,7 @@ func MSanSupported(goos, goarch string) bool {
 func ASanSupported(goos, goarch string) bool {
 	switch goos {
 	case "linux":
-		return goarch == "arm64" || goarch == "amd64" || goarch == "riscv64"
+		return goarch == "arm64" || goarch == "amd64" || goarch == "riscv64" || goarch == "ppc64le"
 	default:
 		return false
 	}

src/runtime/asan/asan.go

@@ -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 asan && linux && (arm64 || amd64 || riscv64)
+//go:build asan && linux && (arm64 || amd64 || riscv64 || ppc64le)
 
 package asan
 

src/runtime/asan_ppc64le.s

@@ -0,0 +1,87 @@
+// Copyright 2022 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build asan
+
+#include "go_asm.h"
+#include "textflag.h"
+
+#define RARG0 R3
+#define RARG1 R4
+#define RARG2 R5
+#define RARG3 R6
+#define FARG R12
+
+// Called from instrumented code.
+// func runtime·doasanread(addr unsafe.Pointer, sz, sp, pc uintptr)
+TEXT	runtime·doasanread(SB),NOSPLIT|NOFRAME,$0-32
+	MOVD	addr+0(FP), RARG0
+	MOVD	sz+8(FP), RARG1
+	MOVD	sp+16(FP), RARG2
+	MOVD	pc+24(FP), RARG3
+	// void __asan_read_go(void *addr, uintptr_t sz, void *sp, void *pc);
+	MOVD	$__asan_read_go(SB), FARG
+	BR	asancall<>(SB)
+
+// func runtime·doasanwrite(addr unsafe.Pointer, sz, sp, pc uintptr)
+TEXT	runtime·doasanwrite(SB),NOSPLIT|NOFRAME,$0-32
+	MOVD	addr+0(FP), RARG0
+	MOVD	sz+8(FP), RARG1
+	MOVD	sp+16(FP), RARG2
+	MOVD	pc+24(FP), RARG3
+	// void __asan_write_go(void *addr, uintptr_t sz, void *sp, void *pc);
+	MOVD	$__asan_write_go(SB), FARG
+	BR	asancall<>(SB)
+
+// func runtime·asanunpoison(addr unsafe.Pointer, sz uintptr)
+TEXT	runtime·asanunpoison(SB),NOSPLIT|NOFRAME,$0-16
+	MOVD	addr+0(FP), RARG0
+	MOVD	sz+8(FP), RARG1
+	// void __asan_unpoison_go(void *addr, uintptr_t sz);
+	MOVD	$__asan_unpoison_go(SB), FARG
+	BR	asancall<>(SB)
+
+// func runtime·asanpoison(addr unsafe.Pointer, sz uintptr)
+TEXT	runtime·asanpoison(SB),NOSPLIT|NOFRAME,$0-16
+	MOVD	addr+0(FP), RARG0
+	MOVD	sz+8(FP), RARG1
+	// void __asan_poison_go(void *addr, uintptr_t sz);
+	MOVD	$__asan_poison_go(SB), FARG
+	BR	asancall<>(SB)
+
+// func runtime·asanregisterglobals(addr unsafe.Pointer, n uintptr)
+TEXT	runtime·asanregisterglobals(SB),NOSPLIT|NOFRAME,$0-16
+	MOVD	addr+0(FP), RARG0
+	MOVD	n+8(FP), RARG1
+	// void __asan_register_globals_go(void *addr, uintptr_t n);
+	MOVD	$__asan_register_globals_go(SB), FARG
+	BR	asancall<>(SB)
+
+// Switches SP to g0 stack and calls (FARG). Arguments already set.
+TEXT	asancall<>(SB), NOSPLIT, $0-0
+	// LR saved in generated prologue
+	// Get info from the current goroutine
+	MOVD	runtime·tls_g(SB), R10  // g offset in TLS
+	MOVD	0(R10), g
+	MOVD	g_m(g), R7		// m for g
+	MOVD	R1, R16			// callee-saved, preserved across C call
+	MOVD	m_g0(R7), R10		// g0 for m
+	CMP	R10, g			// same g0?
+	BEQ	call			// already on g0
+	MOVD	(g_sched+gobuf_sp)(R10), R1 // switch R1
+call:
+	// prepare frame for C ABI
+	SUB	$32, R1			// create frame for callee saving LR, CR, R2 etc.
+	RLDCR	$0, R1, $~15, R1	// align SP to 16 bytes
+	MOVD	FARG, CTR		// address of function to be called
+	MOVD	R0, 0(R1)		// clear back chain pointer
+	BL	(CTR)
+	MOVD	$0, R0			// C code can clobber R0 set it back to 0
+	MOVD	R16, R1			// restore R1;
+	MOVD	runtime·tls_g(SB), R10	// find correct g
+	MOVD	0(R10), g
+	RET
+
+// tls_g, g value for each thread in TLS
+GLOBL runtime·tls_g+0(SB), TLSBSS+DUPOK, $8