Commit | Line | Data |
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00f8b1bc | 1 | /* |
69d0627a RM |
2 | * Code for the vDSO. This version uses the syscall instruction. |
3 | * | |
4 | * First get the common code for the sigreturn entry points. | |
5 | * This must come first. | |
00f8b1bc | 6 | */ |
69d0627a RM |
7 | #define SYSCALL_ENTER_KERNEL syscall |
8 | #include "sigreturn.S" | |
00f8b1bc | 9 | |
00f8b1bc RM |
10 | #include <asm/segment.h> |
11 | ||
12 | .text | |
13 | .globl __kernel_vsyscall | |
14 | .type __kernel_vsyscall,@function | |
69d0627a | 15 | ALIGN |
00f8b1bc RM |
16 | __kernel_vsyscall: |
17 | .LSTART_vsyscall: | |
18 | push %ebp | |
19 | .Lpush_ebp: | |
20 | movl %ecx, %ebp | |
21 | syscall | |
22 | movl $__USER32_DS, %ecx | |
23 | movl %ecx, %ss | |
24 | movl %ebp, %ecx | |
25 | popl %ebp | |
26 | .Lpop_ebp: | |
27 | ret | |
28 | .LEND_vsyscall: | |
29 | .size __kernel_vsyscall,.-.LSTART_vsyscall | |
30 | ||
31 | .section .eh_frame,"a",@progbits | |
32 | .LSTARTFRAME: | |
33 | .long .LENDCIE-.LSTARTCIE | |
34 | .LSTARTCIE: | |
35 | .long 0 /* CIE ID */ | |
36 | .byte 1 /* Version number */ | |
37 | .string "zR" /* NUL-terminated augmentation string */ | |
38 | .uleb128 1 /* Code alignment factor */ | |
39 | .sleb128 -4 /* Data alignment factor */ | |
40 | .byte 8 /* Return address register column */ | |
41 | .uleb128 1 /* Augmentation value length */ | |
42 | .byte 0x1b /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */ | |
43 | .byte 0x0c /* DW_CFA_def_cfa */ | |
44 | .uleb128 4 | |
45 | .uleb128 4 | |
46 | .byte 0x88 /* DW_CFA_offset, column 0x8 */ | |
47 | .uleb128 1 | |
48 | .align 4 | |
49 | .LENDCIE: | |
50 | ||
51 | .long .LENDFDE1-.LSTARTFDE1 /* Length FDE */ | |
52 | .LSTARTFDE1: | |
53 | .long .LSTARTFDE1-.LSTARTFRAME /* CIE pointer */ | |
54 | .long .LSTART_vsyscall-. /* PC-relative start address */ | |
55 | .long .LEND_vsyscall-.LSTART_vsyscall | |
56 | .uleb128 0 /* Augmentation length */ | |
57 | /* What follows are the instructions for the table generation. | |
58 | We have to record all changes of the stack pointer. */ | |
59 | .byte 0x40 + .Lpush_ebp-.LSTART_vsyscall /* DW_CFA_advance_loc */ | |
60 | .byte 0x0e /* DW_CFA_def_cfa_offset */ | |
61 | .uleb128 8 | |
62 | .byte 0x85, 0x02 /* DW_CFA_offset %ebp -8 */ | |
63 | .byte 0x40 + .Lpop_ebp-.Lpush_ebp /* DW_CFA_advance_loc */ | |
64 | .byte 0xc5 /* DW_CFA_restore %ebp */ | |
65 | .byte 0x0e /* DW_CFA_def_cfa_offset */ | |
66 | .uleb128 4 | |
67 | .align 4 | |
68 | .LENDFDE1: | |
69d0627a | 69 | .previous |
00f8b1bc | 70 | |
69d0627a RM |
71 | /* |
72 | * Pad out the segment to match the size of the sysenter.S version. | |
73 | */ | |
cadd5164 | 74 | VDSO32_vsyscall_eh_frame_size = 0x40 |
69d0627a RM |
75 | .section .data,"aw",@progbits |
76 | .space VDSO32_vsyscall_eh_frame_size-(.LENDFDE1-.LSTARTFRAME), 0 | |
77 | .previous |