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authorRich Felker <dalias@aerifal.cx>2011-08-06 20:45:30 -0400
committerRich Felker <dalias@aerifal.cx>2011-08-06 20:45:30 -0400
commit8426a99048261b998a27557cf34f81626ffe9f12 (patch)
tree4df1b3180ee6facecada2150406e9e003904f479
parent357876052b125dcd74882f61afec19d8f519074c (diff)
downloadmusl-8426a99048261b998a27557cf34f81626ffe9f12.tar.gz
ensure the compiler does not move around thread-register-based reads
if gcc decided to move this across a conditional that checks validity of the thread register, an invalid thread-register-based read could be performed and raise sigsegv.
-rw-r--r--arch/i386/pthread_arch.h2
-rw-r--r--arch/x86_64/pthread_arch.h2
2 files changed, 2 insertions, 2 deletions
diff --git a/arch/i386/pthread_arch.h b/arch/i386/pthread_arch.h
index b17dc87a..0ea0aaca 100644
--- a/arch/i386/pthread_arch.h
+++ b/arch/i386/pthread_arch.h
@@ -1,7 +1,7 @@
static inline struct pthread *__pthread_self()
{
struct pthread *self;
- __asm__ ("movl %%gs:0,%0" : "=r" (self) );
+ __asm__ __volatile__ ("movl %%gs:0,%0" : "=r" (self) );
return self;
}
diff --git a/arch/x86_64/pthread_arch.h b/arch/x86_64/pthread_arch.h
index c424493a..836187f5 100644
--- a/arch/x86_64/pthread_arch.h
+++ b/arch/x86_64/pthread_arch.h
@@ -1,7 +1,7 @@
static inline struct pthread *__pthread_self()
{
struct pthread *self;
- __asm__ ("movq %%fs:0,%0" : "=r" (self) );
+ __asm__ __volatile__ ("movq %%fs:0,%0" : "=r" (self) );
return self;
}