From da2e9e1ff40c863a12803c32209baaded3512433 Mon Sep 17 00:00:00 2001 From: Jakub Jelinek Date: Fri, 31 Mar 2006 02:30:28 -0800 Subject: [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 Cc: Andi Kleen Cc: Paul Mackerras Cc: Benjamin Herrenschmidt Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/powerpc/kernel/vdso32/sigtramp.S | 2 +- arch/powerpc/kernel/vdso64/sigtramp.S | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kernel/vdso32/sigtramp.S b/arch/powerpc/kernel/vdso32/sigtramp.S index e046427..0c6a37b 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 */ diff --git a/arch/powerpc/kernel/vdso64/sigtramp.S b/arch/powerpc/kernel/vdso64/sigtramp.S index 31b604a..7479edb 100644 --- a/arch/powerpc/kernel/vdso64/sigtramp.S +++ b/arch/powerpc/kernel/vdso64/sigtramp.S @@ -263,7 +263,7 @@ V_FUNCTION_END(__kernel_sigtramp_rt64) .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 -8 /* Data alignment factor */ .byte 67 /* Return address register column, ap */ -- cgit v1.1