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-rw-r--r--sys/amd64/amd64/prof_machdep.c26
1 files changed, 22 insertions, 4 deletions
diff --git a/sys/amd64/amd64/prof_machdep.c b/sys/amd64/amd64/prof_machdep.c
index 895d1950b076..5b3e83977ead 100644
--- a/sys/amd64/amd64/prof_machdep.c
+++ b/sys/amd64/amd64/prof_machdep.c
@@ -56,6 +56,20 @@ static int cputime_prof_active;
#endif /* GUPROF */
#ifdef __GNUCLIKE_ASM
+#if defined(SMP) && defined(GUPROF)
+#define MPLOCK " \n\
+ movl $1,%edx \n\
+9: \n\
+ xorl %eax,%eax \n\
+ lock \n\
+ cmpxchgl %edx,mcount_lock \n\
+ jne 9b \n"
+#define MPUNLOCK "movl $0,mcount_lock \n"
+#else /* !(SMP && GUPROF) */
+#define MPLOCK
+#define MPUNLOCK
+#endif /* SMP && GUPROF */
+
__asm(" \n\
GM_STATE = 0 \n\
GMON_PROF_OFF = 3 \n\
@@ -111,8 +125,10 @@ __mcount: \n\
movq 7*8(%rsp),%rsi \n\
\n\
pushfq \n\
- cli \n\
- call mcount \n\
+ cli \n"
+ MPLOCK " \n\
+ call mcount \n"
+ MPUNLOCK " \n\
popfq \n\
popq %r9 \n\
popq %r8 \n\
@@ -163,8 +179,10 @@ GMON_PROF_HIRES = 4 \n\
pushq %r9 \n\
movq 7*8(%rsp),%rdi \n\
pushfq \n\
- cli \n\
- call mexitcount \n\
+ cli \n"
+ MPLOCK " \n\
+ call mexitcount \n"
+ MPUNLOCK " \n\
popfq \n\
popq %r9 \n\
popq %r8 \n\