cadd516422
Some assembler versions automagically optimize .eh_frame contents, changing their size. The CFI in sysenter.S was not using optimal formatting, so it would be changed by newer/smarter assemblers. This ran afoul of the wired constant for padding out the other vDSO images to match its size. This changes the original hand-coded source to use the optimal format encoding for its operations. That leaves nothing more for a fancy assembler to do, so the sizes will match the wired-in expected size regardless of the assembler version. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
57 lines
1.4 KiB
ArmAsm
57 lines
1.4 KiB
ArmAsm
/*
|
|
* Code for the vDSO. This version uses the old int $0x80 method.
|
|
*
|
|
* First get the common code for the sigreturn entry points.
|
|
* This must come first.
|
|
*/
|
|
#include "sigreturn.S"
|
|
|
|
.text
|
|
.globl __kernel_vsyscall
|
|
.type __kernel_vsyscall,@function
|
|
ALIGN
|
|
__kernel_vsyscall:
|
|
.LSTART_vsyscall:
|
|
int $0x80
|
|
ret
|
|
.LEND_vsyscall:
|
|
.size __kernel_vsyscall,.-.LSTART_vsyscall
|
|
.previous
|
|
|
|
.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
|
|
.previous
|