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x86/vdso: Replace hex int80 CFI annotations with GAS directives

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Maintaining the current CFI annotations written in R'lyehian is
difficult for most of us.  Translate them to something a little
closer to English.

This will remove the CFI data for kernels built with extremely
old versions of binutils.  I think this is a fair tradeoff for
the ability for mortals to edit the asm.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/ae3ff4ff5278b4bfc1e1dab368823469866d4b71.1444091584.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Andy Lutomirski 2015-10-05 17:47:59 -07:00 committed by Ingo Molnar
parent f24f910884
commit 29c0ce9508
1 changed files with 8 additions and 40 deletions
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48
arch/x86/entry/vdso/vdso32/system_call.S
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@ -1,6 +1,10 @@
/*
* Code for the vDSO. This version uses the old int $0x80 method.
*
*/
#include <asm/dwarf2.h>
/*
* First get the common code for the sigreturn entry points.
* This must come first.
*/
@ -11,46 +15,10 @@
.type __kernel_vsyscall,@function
ALIGN
__kernel_vsyscall:
.LSTART_vsyscall:
CFI_STARTPROC
int $0x80
ret
.LEND_vsyscall:
.size __kernel_vsyscall,.-.LSTART_vsyscall
.previous
CFI_ENDPROC
.section .eh_frame,"a",@progbits
.LSTARTFRAMEDLSI:
.long .LENDCIEDLSI-.LSTARTCIEDLSI
.LSTARTCIEDLSI:
.long 0 /* CIE ID */
.byte 1 /* Version number */
.string "zR" /* NUL-terminated augmentation string */
.uleb128 1 /* Code alignment factor */
.sleb128 -4 /* Data alignment factor */
.byte 8 /* Return address register column */
.uleb128 1 /* Augmentation value length */
.byte 0x1b /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */
.byte 0x0c /* DW_CFA_def_cfa */
.uleb128 4
.uleb128 4
.byte 0x88 /* DW_CFA_offset, column 0x8 */
.uleb128 1
.align 4
.LENDCIEDLSI:
.long .LENDFDEDLSI-.LSTARTFDEDLSI /* Length FDE */
.LSTARTFDEDLSI:
.long .LSTARTFDEDLSI-.LSTARTFRAMEDLSI /* CIE pointer */
.long .LSTART_vsyscall-. /* PC-relative start address */
.long .LEND_vsyscall-.LSTART_vsyscall
.uleb128 0
.align 4
.LENDFDEDLSI:
.previous
/*
* Pad out the segment to match the size of the sysenter.S version.
*/
VDSO32_vsyscall_eh_frame_size = 0x40
.section .data,"aw",@progbits
.space VDSO32_vsyscall_eh_frame_size-(.LENDFDEDLSI-.LSTARTFRAMEDLSI), 0
.size __kernel_vsyscall,.-__kernel_vsyscall
.previous