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authorJakub Jelinek <jakub@redhat.com>2006-03-31 02:30:28 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-31 12:18:52 -0800
commitda2e9e1ff40c863a12803c32209baaded3512433 (patch)
tree7770ed3904d312850e745cca175a7322b63785ab /arch/powerpc/kernel/vdso32
parent97db7fbfc7712bc403330c81c04ddfa82b335bce (diff)
downloadblackbird-op-linux-da2e9e1ff40c863a12803c32209baaded3512433.tar.gz
blackbird-op-linux-da2e9e1ff40c863a12803c32209baaded3512433.zip
[PATCH] Mark unwind info for signal trampolines in vDSOs
Mark unwind info for signal trampolines using the new S augmentation flag introduced in: http://gcc.gnu.org/PR26208. GCC 4.2 (or patched earlier GCC) will be able to special case unwinding through frames right above signal trampolines. As the augmentations start with z flag and S is at the very end of the augmentation string, older GCCs will just skip the S flag as unknown (that's why an augmentation flag was chosen over say a new CFA opcode). Signed-off-by: Jakub Jelinek <jakub@redhat.com> Cc: Andi Kleen <ak@muc.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/powerpc/kernel/vdso32')
-rw-r--r--arch/powerpc/kernel/vdso32/sigtramp.S2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/vdso32/sigtramp.S b/arch/powerpc/kernel/vdso32/sigtramp.S
index e04642781917..0c6a37b29dde 100644
--- a/arch/powerpc/kernel/vdso32/sigtramp.S
+++ b/arch/powerpc/kernel/vdso32/sigtramp.S
@@ -261,7 +261,7 @@ V_FUNCTION_END(__kernel_sigtramp_rt32)
.Lcie_start:
.long 0 /* CIE ID */
.byte 1 /* Version number */
- .string "zR" /* NUL-terminated augmentation string */
+ .string "zRS" /* NUL-terminated augmentation string */
.uleb128 4 /* Code alignment factor */
.sleb128 -4 /* Data alignment factor */
.byte 67 /* Return address register column, ap */
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