2db55d344e
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
69 lines
1.8 KiB
ArmAsm
69 lines
1.8 KiB
ArmAsm
/*
|
|
* Code for the vsyscall page. This version uses the syscall instruction.
|
|
*/
|
|
|
|
#include <asm/ia32_unistd.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/segment.h>
|
|
|
|
.code32
|
|
.text
|
|
.section .text.vsyscall,"ax"
|
|
.globl __kernel_vsyscall
|
|
.type __kernel_vsyscall,@function
|
|
__kernel_vsyscall:
|
|
.LSTART_vsyscall:
|
|
push %ebp
|
|
.Lpush_ebp:
|
|
movl %ecx, %ebp
|
|
syscall
|
|
movl $__USER32_DS, %ecx
|
|
movl %ecx, %ss
|
|
movl %ebp, %ecx
|
|
popl %ebp
|
|
.Lpop_ebp:
|
|
ret
|
|
.LEND_vsyscall:
|
|
.size __kernel_vsyscall,.-.LSTART_vsyscall
|
|
|
|
.section .eh_frame,"a",@progbits
|
|
.LSTARTFRAME:
|
|
.long .LENDCIE-.LSTARTCIE
|
|
.LSTARTCIE:
|
|
.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
|
|
.LENDCIE:
|
|
|
|
.long .LENDFDE1-.LSTARTFDE1 /* Length FDE */
|
|
.LSTARTFDE1:
|
|
.long .LSTARTFDE1-.LSTARTFRAME /* CIE pointer */
|
|
.long .LSTART_vsyscall-. /* PC-relative start address */
|
|
.long .LEND_vsyscall-.LSTART_vsyscall
|
|
.uleb128 0 /* Augmentation length */
|
|
/* What follows are the instructions for the table generation.
|
|
We have to record all changes of the stack pointer. */
|
|
.byte 0x40 + .Lpush_ebp-.LSTART_vsyscall /* DW_CFA_advance_loc */
|
|
.byte 0x0e /* DW_CFA_def_cfa_offset */
|
|
.uleb128 8
|
|
.byte 0x85, 0x02 /* DW_CFA_offset %ebp -8 */
|
|
.byte 0x40 + .Lpop_ebp-.Lpush_ebp /* DW_CFA_advance_loc */
|
|
.byte 0xc5 /* DW_CFA_restore %ebp */
|
|
.byte 0x0e /* DW_CFA_def_cfa_offset */
|
|
.uleb128 4
|
|
.align 4
|
|
.LENDFDE1:
|
|
|
|
#define SYSCALL_ENTER_KERNEL syscall
|
|
#include "vsyscall-sigreturn.S"
|