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[PATCH] x86_64: More CFI fixes for 32bit entry code 

Frame unwind information was still incorrect for ia32_ptregs_common
(sorry, my fault), and could be improved for some of the other entry
points.

Signed-Off-By: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jan Beulich 2006-01-11 22:41:59 +01:00 committed by Linus Torvalds
parent 6076399e95
commit 2765130b02
2 changed files with 30 additions and 5 deletions
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33
arch/x86_64/ia32/ia32entry.S
View File

@ -35,6 +35,18 @@
movq %rax,R8(%rsp)
.endm
.macro CFI_STARTPROC32 simple
CFI_STARTPROC \simple
CFI_UNDEFINED r8
CFI_UNDEFINED r9
CFI_UNDEFINED r10
CFI_UNDEFINED r11
CFI_UNDEFINED r12
CFI_UNDEFINED r13
CFI_UNDEFINED r14
CFI_UNDEFINED r15
.endm
/*
* 32bit SYSENTER instruction entry.
*
@ -55,7 +67,7 @@
* with the int 0x80 path.
*/
ENTRY(ia32_sysenter_target)
CFI_STARTPROC simple
CFI_STARTPROC32 simple
CFI_DEF_CFA rsp,0
CFI_REGISTER rsp,rbp
swapgs
@ -161,7 +173,7 @@ sysenter_tracesys:
* with the int 0x80 path.
*/
ENTRY(ia32_cstar_target)
CFI_STARTPROC simple
CFI_STARTPROC32 simple
CFI_DEF_CFA rsp,0
CFI_REGISTER rip,rcx
/*CFI_REGISTER rflags,r11*/
@ -318,7 +330,7 @@ quiet_ni_syscall:
jmp ia32_ptregs_common
.endm
CFI_STARTPROC
CFI_STARTPROC32
PTREGSCALL stub32_rt_sigreturn, sys32_rt_sigreturn, %rdi
PTREGSCALL stub32_sigreturn, sys32_sigreturn, %rdi
@ -333,8 +345,19 @@ quiet_ni_syscall:
ENTRY(ia32_ptregs_common)
popq %r11
CFI_ADJUST_CFA_OFFSET -8
CFI_REGISTER rip, r11
CFI_ENDPROC
CFI_STARTPROC32 simple
CFI_DEF_CFA rsp,SS+8-ARGOFFSET
CFI_REL_OFFSET rax,RAX-ARGOFFSET
CFI_REL_OFFSET rcx,RCX-ARGOFFSET
CFI_REL_OFFSET rdx,RDX-ARGOFFSET
CFI_REL_OFFSET rsi,RSI-ARGOFFSET
CFI_REL_OFFSET rdi,RDI-ARGOFFSET
CFI_REL_OFFSET rip,RIP-ARGOFFSET
/* CFI_REL_OFFSET cs,CS-ARGOFFSET*/
/* CFI_REL_OFFSET rflags,EFLAGS-ARGOFFSET*/
CFI_REL_OFFSET rsp,RSP-ARGOFFSET
/* CFI_REL_OFFSET ss,SS-ARGOFFSET*/
SAVE_REST
call *%rax
RESTORE_REST

2
include/asm-x86_64/dwarf2.h
View File

@ -28,6 +28,7 @@
#define CFI_RESTORE .cfi_restore
#define CFI_REMEMBER_STATE .cfi_remember_state
#define CFI_RESTORE_STATE .cfi_restore_state
#define CFI_UNDEFINED .cfi_undefined
#else
@ -44,6 +45,7 @@
#define CFI_RESTORE #
#define CFI_REMEMBER_STATE #
#define CFI_RESTORE_STATE #
#define CFI_UNDEFINED #
#endif