1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
/*
* Code for the vDSO. This version uses the syscall instruction.
*
* First get the common code for the sigreturn entry points.
* This must come first.
*/
#define SYSCALL_ENTER_KERNEL syscall
#include "sigreturn.S"
#include <asm/segment.h>
.text
.globl __kernel_vsyscall
.type __kernel_vsyscall,@function
ALIGN
__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:
.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-(.LENDFDE1-.LSTARTFRAME), 0
.previous
|
