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Commit dffead4e authored by Jan Beulich's avatar Jan Beulich Committed by Linus Torvalds
Browse files

[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: default avatarJan Beulich <jbeulich@novell.com>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 1de9c3f6

arch/x86_64/ia32/ia32entry.S

+1 −1
Original line number Diff line number Diff line
@@ -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

arch/x86_64/kernel/entry.S

+1 −1
Original line number Diff line number Diff line
@@ -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