You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
94 lines
2.6 KiB
94 lines
2.6 KiB
/*
|
|
* Code for the vsyscall page. This version uses the sysenter instruction.
|
|
*/
|
|
|
|
#include <asm/ia32_unistd.h>
|
|
#include <asm/asm-offsets.h>
|
|
|
|
.text
|
|
.section .text.vsyscall,"ax"
|
|
.globl __kernel_vsyscall
|
|
.type __kernel_vsyscall,@function
|
|
__kernel_vsyscall:
|
|
.LSTART_vsyscall:
|
|
push %ecx
|
|
.Lpush_ecx:
|
|
push %edx
|
|
.Lpush_edx:
|
|
push %ebp
|
|
.Lenter_kernel:
|
|
movl %esp,%ebp
|
|
sysenter
|
|
.space 7,0x90
|
|
jmp .Lenter_kernel
|
|
/* 16: System call normal return point is here! */
|
|
pop %ebp
|
|
.Lpop_ebp:
|
|
pop %edx
|
|
.Lpop_edx:
|
|
pop %ecx
|
|
.Lpop_ecx:
|
|
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 0x04 /* DW_CFA_advance_loc4 */
|
|
.long .Lpush_ecx-.LSTART_vsyscall
|
|
.byte 0x0e /* DW_CFA_def_cfa_offset */
|
|
.byte 0x08 /* RA at offset 8 now */
|
|
.byte 0x04 /* DW_CFA_advance_loc4 */
|
|
.long .Lpush_edx-.Lpush_ecx
|
|
.byte 0x0e /* DW_CFA_def_cfa_offset */
|
|
.byte 0x0c /* RA at offset 12 now */
|
|
.byte 0x04 /* DW_CFA_advance_loc4 */
|
|
.long .Lenter_kernel-.Lpush_edx
|
|
.byte 0x0e /* DW_CFA_def_cfa_offset */
|
|
.byte 0x10 /* RA at offset 16 now */
|
|
.byte 0x85, 0x04 /* DW_CFA_offset %ebp -16 */
|
|
/* Finally the epilogue. */
|
|
.byte 0x04 /* DW_CFA_advance_loc4 */
|
|
.long .Lpop_ebp-.Lenter_kernel
|
|
.byte 0x0e /* DW_CFA_def_cfa_offset */
|
|
.byte 0x12 /* RA at offset 12 now */
|
|
.byte 0xc5 /* DW_CFA_restore %ebp */
|
|
.byte 0x04 /* DW_CFA_advance_loc4 */
|
|
.long .Lpop_edx-.Lpop_ebp
|
|
.byte 0x0e /* DW_CFA_def_cfa_offset */
|
|
.byte 0x08 /* RA at offset 8 now */
|
|
.byte 0x04 /* DW_CFA_advance_loc4 */
|
|
.long .Lpop_ecx-.Lpop_edx
|
|
.byte 0x0e /* DW_CFA_def_cfa_offset */
|
|
.byte 0x04 /* RA at offset 4 now */
|
|
.align 4
|
|
.LENDFDE1:
|
|
|
|
#define SYSCALL_ENTER_KERNEL int $0x80
|
|
#include "vsyscall-sigreturn.S"
|
|
|