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-rw-r--r--src/runtime/msan_arm64.s73
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diff --git a/src/runtime/msan_arm64.s b/src/runtime/msan_arm64.s
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+// Copyright 2018 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 msan
+
+#include "go_asm.h"
+#include "textflag.h"
+
+#define RARG0 R0
+#define RARG1 R1
+#define RARG2 R2
+#define FARG R3
+
+// func runtime·domsanread(addr unsafe.Pointer, sz uintptr)
+// Called from msanread.
+TEXT runtime·domsanread(SB), NOSPLIT, $0-16
+ MOVD addr+0(FP), RARG0
+ MOVD size+8(FP), RARG1
+ // void __msan_read_go(void *addr, uintptr_t sz);
+ MOVD $__msan_read_go(SB), FARG
+ JMP msancall<>(SB)
+
+// func runtime·msanwrite(addr unsafe.Pointer, sz uintptr)
+// Called from instrumented code.
+TEXT runtime·msanwrite(SB), NOSPLIT, $0-16
+ MOVD addr+0(FP), RARG0
+ MOVD size+8(FP), RARG1
+ // void __msan_write_go(void *addr, uintptr_t sz);
+ MOVD $__msan_write_go(SB), FARG
+ JMP msancall<>(SB)
+
+// func runtime·msanmalloc(addr unsafe.Pointer, sz uintptr)
+TEXT runtime·msanmalloc(SB), NOSPLIT, $0-16
+ MOVD addr+0(FP), RARG0
+ MOVD size+8(FP), RARG1
+ // void __msan_malloc_go(void *addr, uintptr_t sz);
+ MOVD $__msan_malloc_go(SB), FARG
+ JMP msancall<>(SB)
+
+// func runtime·msanfree(addr unsafe.Pointer, sz uintptr)
+TEXT runtime·msanfree(SB), NOSPLIT, $0-16
+ MOVD addr+0(FP), RARG0
+ MOVD size+8(FP), RARG1
+ // void __msan_free_go(void *addr, uintptr_t sz);
+ MOVD $__msan_free_go(SB), FARG
+ JMP msancall<>(SB)
+
+// func runtime·msanmove(dst, src unsafe.Pointer, sz uintptr)
+TEXT runtime·msanmove(SB), NOSPLIT, $0-24
+ MOVD dst+0(FP), RARG0
+ MOVD src+8(FP), RARG1
+ MOVD size+16(FP), RARG2
+ // void __msan_memmove(void *dst, void *src, uintptr_t sz);
+ MOVD $__msan_memmove(SB), FARG
+ JMP msancall<>(SB)
+
+// Switches SP to g0 stack and calls (FARG). Arguments already set.
+TEXT msancall<>(SB), NOSPLIT, $0-0
+ MOVD RSP, R19 // callee-saved
+ CBZ g, g0stack // no g, still on a system stack
+ MOVD g_m(g), R10
+ MOVD m_g0(R10), R11
+ CMP R11, g
+ BEQ g0stack
+
+ MOVD (g_sched+gobuf_sp)(R11), R4
+ MOVD R4, RSP
+
+g0stack:
+ BL (FARG)
+ MOVD R19, RSP
+ RET