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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Code for the vsyscall page. This version uses the syscall instruction. | |
3 | */ | |
4 | ||
5 | #include <asm/ia32_unistd.h> | |
e2d5df93 | 6 | #include <asm/asm-offsets.h> |
1da177e4 LT |
7 | #include <asm/segment.h> |
8 | ||
9 | .text | |
10 | .section .text.vsyscall,"ax" | |
11 | .globl __kernel_vsyscall | |
12 | .type __kernel_vsyscall,@function | |
13 | __kernel_vsyscall: | |
14 | .LSTART_vsyscall: | |
15 | push %ebp | |
16 | .Lpush_ebp: | |
17 | movl %ecx, %ebp | |
18 | syscall | |
19 | movl $__USER32_DS, %ecx | |
20 | movl %ecx, %ss | |
21 | movl %ebp, %ecx | |
22 | popl %ebp | |
23 | .Lpop_ebp: | |
24 | ret | |
25 | .LEND_vsyscall: | |
26 | .size __kernel_vsyscall,.-.LSTART_vsyscall | |
27 | ||
28 | .section .eh_frame,"a",@progbits | |
29 | .LSTARTFRAME: | |
30 | .long .LENDCIE-.LSTARTCIE | |
31 | .LSTARTCIE: | |
32 | .long 0 /* CIE ID */ | |
33 | .byte 1 /* Version number */ | |
34 | .string "zR" /* NUL-terminated augmentation string */ | |
35 | .uleb128 1 /* Code alignment factor */ | |
36 | .sleb128 -4 /* Data alignment factor */ | |
37 | .byte 8 /* Return address register column */ | |
38 | .uleb128 1 /* Augmentation value length */ | |
39 | .byte 0x1b /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */ | |
40 | .byte 0x0c /* DW_CFA_def_cfa */ | |
41 | .uleb128 4 | |
42 | .uleb128 4 | |
43 | .byte 0x88 /* DW_CFA_offset, column 0x8 */ | |
44 | .uleb128 1 | |
45 | .align 4 | |
46 | .LENDCIE: | |
47 | ||
48 | .long .LENDFDE1-.LSTARTFDE1 /* Length FDE */ | |
49 | .LSTARTFDE1: | |
50 | .long .LSTARTFDE1-.LSTARTFRAME /* CIE pointer */ | |
51 | .long .LSTART_vsyscall-. /* PC-relative start address */ | |
52 | .long .LEND_vsyscall-.LSTART_vsyscall | |
53 | .uleb128 0 /* Augmentation length */ | |
54 | /* What follows are the instructions for the table generation. | |
55 | We have to record all changes of the stack pointer. */ | |
56 | .byte 0x40 + .Lpush_ebp-.LSTART_vsyscall /* DW_CFA_advance_loc */ | |
57 | .byte 0x0e /* DW_CFA_def_cfa_offset */ | |
58 | .uleb128 8 | |
59 | .byte 0x85, 0x02 /* DW_CFA_offset %ebp -8 */ | |
60 | .byte 0x40 + .Lpop_ebp-.Lpush_ebp /* DW_CFA_advance_loc */ | |
61 | .byte 0xc5 /* DW_CFA_restore %ebp */ | |
62 | .byte 0x0e /* DW_CFA_def_cfa_offset */ | |
63 | .uleb128 4 | |
64 | .align 4 | |
65 | .LENDFDE1: | |
66 | ||
67 | #define SYSCALL_ENTER_KERNEL syscall | |
68 | #include "vsyscall-sigreturn.S" |