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| author | Jan Beulich <JBeulich@suse.com> | 2011-09-28 19:57:52 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-09-28 21:04:52 +0400 |
| commit | eab9e6137f237681a04649e786cc4d942bedd6d1 (patch) | |
| tree | 8ab92f349f7bc33a9b0f1e93cd81ac0609157389 /arch/x86/include/asm/dwarf2.h | |
| parent | e05139f2569ecf699b229a6473a86cdffed62956 (diff) | |
| download | linux-eab9e6137f237681a04649e786cc4d942bedd6d1.tar.xz | |
x86-64: Fix CFI data for interrupt frames
The patch titled "x86: Don't use frame pointer to save old stack
on irq entry" did not properly adjust CFI directives, so this
patch is a follow-up to that one.
With the old stack pointer no longer stored in a callee-saved
register (plus some offset), we now have to use a CFA expression
to describe the memory location where it is being found. This
requires the use of .cfi_escape (allowing arbitrary byte streams
to be emitted into .eh_frame), as there is no
.cfi_def_cfa_expression (which also cannot reasonably be
expected, as it would require a full expression parser).
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/r/4E8360200200007800058467@nat28.tlf.novell.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/include/asm/dwarf2.h')
| -rw-r--r-- | arch/x86/include/asm/dwarf2.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/include/asm/dwarf2.h b/arch/x86/include/asm/dwarf2.h index 326099199318..f6f15986df6c 100644 --- a/arch/x86/include/asm/dwarf2.h +++ b/arch/x86/include/asm/dwarf2.h @@ -27,6 +27,7 @@ #define CFI_REMEMBER_STATE .cfi_remember_state #define CFI_RESTORE_STATE .cfi_restore_state #define CFI_UNDEFINED .cfi_undefined +#define CFI_ESCAPE .cfi_escape #ifdef CONFIG_AS_CFI_SIGNAL_FRAME #define CFI_SIGNAL_FRAME .cfi_signal_frame @@ -68,6 +69,7 @@ #define CFI_REMEMBER_STATE cfi_ignore #define CFI_RESTORE_STATE cfi_ignore #define CFI_UNDEFINED cfi_ignore +#define CFI_ESCAPE cfi_ignore #define CFI_SIGNAL_FRAME cfi_ignore #endif |