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authorWaldemar Brodkorb <wbx@openadk.org>2017-05-17 11:07:36 +0200
committerWaldemar Brodkorb <wbx@openadk.org>2017-05-17 11:13:49 +0200
commitd183d93e47ad16bc9983107a419121b02e0da51e (patch)
tree4edb5f5e2b12afd21a3c123a2b5bf361a1d5ab30
parentbaad294eaf59e0e1b311a11448a04e3d3c5f3c56 (diff)
x86: fix segfaults on SMP machine
As reported by Bering-uClibc project uClibc-ng for x86 generates a segfault on SMP machines when trying to run ntpd. A small test case is here: https://gist.github.com/ddrown Use a similar nop instruction as for x86_64 in the code. Signed-off-by: KP.Kirchdoerfer <kapeka@bering-uclibc.de>
-rw-r--r--libc/sysdeps/linux/i386/sigaction.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/i386/sigaction.c b/libc/sysdeps/linux/i386/sigaction.c
index 77da69d5e..cf6daa787 100644
--- a/libc/sysdeps/linux/i386/sigaction.c
+++ b/libc/sysdeps/linux/i386/sigaction.c
@@ -115,6 +115,7 @@ libc_hidden_weak(sigaction)
/* The return code for realtime-signals. */
# define RESTORE2(name, syscall) \
__asm__ ( \
+ "nop\n" \
".text\n" \
"__" #name ":\n" \
" movl $" #syscall ", %eax\n" \
@@ -128,6 +129,7 @@ RESTORE(restore_rt, __NR_rt_sigreturn)
# undef RESTORE2
# define RESTORE2(name, syscall) \
__asm__ ( \
+ "nop\n" \
".text\n" \
"__" #name ":\n" \
" popl %eax\n" \