[PATCH] LoongArch: Fix intermittent nptl/tst-cancel32 failure

[mengqinggang]

The nptl/tst-cancel32 test fails intermittently on LoongArch
with SIGSEGV at __longjmp:

0x7ffff7de7f6c <__longjmp+28>   rotri.d         $sp, $t0, 0x11
0x7ffff7de7f70 <__longjmp+32>   xor             $sp, $sp, $t1

rotri.d and xor are expanded from PTR_DEMANGLE2.
If the thread is cancelled between the rotri.d and xor,
an incomplete sp register causes the SIGSEGV.

Change the destination register of rotri.d to avoid an incomplete sp.
---
 sysdeps/unix/sysv/linux/loongarch/pointer_guard-asm.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sysdeps/unix/sysv/linux/loongarch/pointer_guard-asm.h b/sysdeps/unix/sysv/linux/loongarch/pointer_guard-asm.h
index 75498545cb..24e27e4092 100644
--- a/sysdeps/unix/sysv/linux/loongarch/pointer_guard-asm.h
+++ b/sysdeps/unix/sysv/linux/loongarch/pointer_guard-asm.h
@@ -40,8 +40,8 @@
   xor  dst, src, guard; \
   rotri.d  dst, dst, 47;
 # define PTR_DEMANGLE2(dst, src, guard) \
-  rotri.d  dst, src, 17; \
-  xor  dst, dst, guard;
+  rotri.d  src, src, 17; \
+  xor  dst, src, guard;
 #endif
 
 #endif /* POINTER_GUARD_ASM_H */
-- 
2.34.1