* [PATCH] Fix register conflict in s390 ____longjmp_chk
@ 2010-09-15 8:50 Andreas Schwab
0 siblings, 0 replies; only message in thread
From: Andreas Schwab @ 2010-09-15 8:50 UTC (permalink / raw)
To: libc-hacker
r1-r3 are call-clobbered registers so CHECK_SP might clobber them.
Andreas.
2010-09-14 Andreas Schwab <schwab@redhat.com>
* sysdeps/s390/s390-32/__longjmp.c (__longjmp): Define register
variables after CHECK_SP call.
* sysdeps/s390/s390-64/__longjmp.c (__longjmp): Likewise.
---
sysdeps/s390/s390-32/__longjmp.c | 13 ++++++++-----
sysdeps/s390/s390-64/__longjmp.c | 13 ++++++++-----
2 files changed, 16 insertions(+), 10 deletions(-)
diff --git a/sysdeps/s390/s390-32/__longjmp.c b/sysdeps/s390/s390-32/__longjmp.c
index 4abc0ec..95f8b71 100644
--- a/sysdeps/s390/s390-32/__longjmp.c
+++ b/sysdeps/s390/s390-32/__longjmp.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2000, 2001, 2005, 2009 Free Software Foundation, Inc.
+/* Copyright (C) 2000, 2001, 2005, 2009, 2010 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
@@ -29,16 +29,19 @@
void
__longjmp (__jmp_buf env, int val)
{
- register int r2 __asm ("%r2") = val == 0 ? 1 : val;
#ifdef PTR_DEMANGLE
- register uintptr_t r3 __asm ("%r3") = THREAD_GET_POINTER_GUARD ();
- register void *r1 __asm ("%r1") = (void *) env;
+ uintptr_t guard = THREAD_GET_POINTER_GUARD ();
# ifdef CHECK_SP
- CHECK_SP (env, r3);
+ CHECK_SP (env, guard);
# endif
#elif defined CHECK_SP
CHECK_SP (env, 0);
#endif
+ register int r2 __asm ("%r2") = val == 0 ? 1 : val;
+#ifdef PTR_DEMANGLE
+ register uintptr_t r3 __asm ("%r3") = guard;
+ register void *r1 __asm ("%r1") = (void *) env;
+#endif
/* Restore registers and jump back. */
asm volatile ("ld %%f6,48(%1)\n\t"
"ld %%f4,40(%1)\n\t"
diff --git a/sysdeps/s390/s390-64/__longjmp.c b/sysdeps/s390/s390-64/__longjmp.c
index 445bd3b..313b338 100644
--- a/sysdeps/s390/s390-64/__longjmp.c
+++ b/sysdeps/s390/s390-64/__longjmp.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2001, 2005, 2009 Free Software Foundation, Inc.
+/* Copyright (C) 2001, 2005, 2009, 2010 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
@@ -29,16 +29,19 @@
void
__longjmp (__jmp_buf env, int val)
{
- register long int r2 __asm ("%r2") = val == 0 ? 1 : val;
#ifdef PTR_DEMANGLE
- register uintptr_t r3 __asm ("%r3") = THREAD_GET_POINTER_GUARD ();
- register void *r1 __asm ("%r1") = (void *) env;
+ uintptr_t guard = THREAD_GET_POINTER_GUARD ();
# ifdef CHECK_SP
- CHECK_SP (env, r3);
+ CHECK_SP (env, guard);
# endif
#elif defined CHECK_SP
CHECK_SP (env, 0);
#endif
+ register long int r2 __asm ("%r2") = val == 0 ? 1 : val;
+#ifdef PTR_DEMANGLE
+ register uintptr_t r3 __asm ("%r3") = guard;
+ register void *r1 __asm ("%r1") = (void *) env;
+#endif
/* Restore registers and jump back. */
asm volatile ("ld %%f7,104(%1)\n\t"
"ld %%f5,96(%1)\n\t"
--
1.7.2.2
--
Andreas Schwab, schwab@redhat.com
GPG Key fingerprint = D4E8 DBE3 3813 BB5D FA84 5EC7 45C6 250E 6F00 984E
"And now for something completely different."
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2010-09-15 8:50 [PATCH] Fix register conflict in s390 ____longjmp_chk Andreas Schwab
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