[PATCH] x86_64: reliable stack trace support (x86-64 syscall

Adjust the CFA offset for 64- and 32-bit syscall entries so that the five
slots pre-subtracted from the stack pointer do not appear to reside outside
of the current frame.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/x86_64/ia32/ia32entry.S b/arch/x86_64/ia32/ia32entry.S
index d073ca3..222777b 100644 (file)
--- a/arch/x86_64/ia32/ia32entry.S
+++ b/arch/x86_64/ia32/ia32entry.S
@@ -179,7 +179,7 @@ ENDPROC(ia32_sysenter_target)
  */    
 ENTRY(ia32_cstar_target)
        CFI_STARTPROC32 simple
-       CFI_DEF_CFA     rsp,0
+       CFI_DEF_CFA     rsp,PDA_STACKOFFSET
        CFI_REGISTER    rip,rcx
        /*CFI_REGISTER  rflags,r11*/
        swapgs

diff --git a/arch/x86_64/kernel/entry.S b/arch/x86_64/kernel/entry.S
index 4f407ef..7290e72 100644 (file)
--- a/arch/x86_64/kernel/entry.S
+++ b/arch/x86_64/kernel/entry.S
@@ -189,7 +189,7 @@ END(ret_from_fork)
 
 ENTRY(system_call)
        CFI_STARTPROC   simple
-       CFI_DEF_CFA     rsp,0
+       CFI_DEF_CFA     rsp,PDA_STACKOFFSET
        CFI_REGISTER    rip,rcx
        /*CFI_REGISTER  rflags,r11*/
        swapgs