commit a857aad2f3994e6fa42a6fc65330e65d209597a0
author Cherry Zhang <cherryyz@google.com> Thu Jun 20 17:06:57 2019 -0400
committer Ian Lance Taylor <iant@golang.org> Tue Jun 25 06:15:44 2019 +0000
tree d9d217ddc7690bbd567547bea043cdff75b94ff3
parent 89b442a0100286ee569b8d2562ce1b2ea602f7e7

runtime: mark memequal and memclrNoHeapPointers nosplit

They are wrappers of libc functions that use no stack. Mark them
nosplit so the linker won't patch it to call __morestack_non_split.

Change-Id: Ib649f9162d0d69cd20f6a283a763a634ad112967
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/183629
Reviewed-by: Ian Lance Taylor <iant@golang.org>

libgo/runtime/go-memclr.c

diff --git a/libgo/runtime/go-memclr.c b/libgo/runtime/go-memclr.c
index e478b65..b5d4975 100644
--- a/libgo/runtime/go-memclr.c
+++ b/libgo/runtime/go-memclr.c
@@ -7,7 +7,8 @@
 #include "runtime.h"
 
 void memclrNoHeapPointers(void *, uintptr)
-  __asm__ (GOSYM_PREFIX "runtime.memclrNoHeapPointers");
+  __asm__ (GOSYM_PREFIX "runtime.memclrNoHeapPointers")
+  __attribute__ ((no_split_stack));
 
 void
 memclrNoHeapPointers (void *p1, uintptr len)

libgo/runtime/go-memequal.c

diff --git a/libgo/runtime/go-memequal.c b/libgo/runtime/go-memequal.c
index 5f514aa..9648cba 100644
--- a/libgo/runtime/go-memequal.c
+++ b/libgo/runtime/go-memequal.c
@@ -7,7 +7,8 @@
 #include "runtime.h"
 
 _Bool memequal (void *, void *, uintptr)
-  __asm__ (GOSYM_PREFIX "runtime.memequal");
+  __asm__ (GOSYM_PREFIX "runtime.memequal")
+  __attribute__ ((no_split_stack));
 
 _Bool
 memequal (void *p1, void *p2, uintptr len)