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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Code for the vsyscall page. This version uses the sysenter instruction. | |
3 | */ | |
4 | ||
5 | #include <asm/ia32_unistd.h> | |
6 | #include <asm/offset.h> | |
7 | ||
8 | .text | |
9 | .section .text.vsyscall,"ax" | |
10 | .globl __kernel_vsyscall | |
11 | .type __kernel_vsyscall,@function | |
12 | __kernel_vsyscall: | |
13 | .LSTART_vsyscall: | |
14 | push %ecx | |
15 | .Lpush_ecx: | |
16 | push %edx | |
17 | .Lpush_edx: | |
18 | push %ebp | |
19 | .Lenter_kernel: | |
20 | movl %esp,%ebp | |
21 | sysenter | |
22 | .space 7,0x90 | |
23 | jmp .Lenter_kernel | |
24 | /* 16: System call normal return point is here! */ | |
25 | pop %ebp | |
26 | .Lpop_ebp: | |
27 | pop %edx | |
28 | .Lpop_edx: | |
29 | pop %ecx | |
30 | .Lpop_ecx: | |
31 | ret | |
32 | .LEND_vsyscall: | |
33 | .size __kernel_vsyscall,.-.LSTART_vsyscall | |
34 | ||
35 | .section .eh_frame,"a",@progbits | |
36 | .LSTARTFRAME: | |
37 | .long .LENDCIE-.LSTARTCIE | |
38 | .LSTARTCIE: | |
39 | .long 0 /* CIE ID */ | |
40 | .byte 1 /* Version number */ | |
41 | .string "zR" /* NUL-terminated augmentation string */ | |
42 | .uleb128 1 /* Code alignment factor */ | |
43 | .sleb128 -4 /* Data alignment factor */ | |
44 | .byte 8 /* Return address register column */ | |
45 | .uleb128 1 /* Augmentation value length */ | |
46 | .byte 0x1b /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */ | |
47 | .byte 0x0c /* DW_CFA_def_cfa */ | |
48 | .uleb128 4 | |
49 | .uleb128 4 | |
50 | .byte 0x88 /* DW_CFA_offset, column 0x8 */ | |
51 | .uleb128 1 | |
52 | .align 4 | |
53 | .LENDCIE: | |
54 | ||
55 | .long .LENDFDE1-.LSTARTFDE1 /* Length FDE */ | |
56 | .LSTARTFDE1: | |
57 | .long .LSTARTFDE1-.LSTARTFRAME /* CIE pointer */ | |
58 | .long .LSTART_vsyscall-. /* PC-relative start address */ | |
59 | .long .LEND_vsyscall-.LSTART_vsyscall | |
60 | .uleb128 0 /* Augmentation length */ | |
61 | /* What follows are the instructions for the table generation. | |
62 | We have to record all changes of the stack pointer. */ | |
63 | .byte 0x04 /* DW_CFA_advance_loc4 */ | |
64 | .long .Lpush_ecx-.LSTART_vsyscall | |
65 | .byte 0x0e /* DW_CFA_def_cfa_offset */ | |
66 | .byte 0x08 /* RA at offset 8 now */ | |
67 | .byte 0x04 /* DW_CFA_advance_loc4 */ | |
68 | .long .Lpush_edx-.Lpush_ecx | |
69 | .byte 0x0e /* DW_CFA_def_cfa_offset */ | |
70 | .byte 0x0c /* RA at offset 12 now */ | |
71 | .byte 0x04 /* DW_CFA_advance_loc4 */ | |
72 | .long .Lenter_kernel-.Lpush_edx | |
73 | .byte 0x0e /* DW_CFA_def_cfa_offset */ | |
74 | .byte 0x10 /* RA at offset 16 now */ | |
75 | .byte 0x85, 0x04 /* DW_CFA_offset %ebp -16 */ | |
76 | /* Finally the epilogue. */ | |
77 | .byte 0x04 /* DW_CFA_advance_loc4 */ | |
78 | .long .Lpop_ebp-.Lenter_kernel | |
79 | .byte 0x0e /* DW_CFA_def_cfa_offset */ | |
80 | .byte 0x12 /* RA at offset 12 now */ | |
81 | .byte 0xc5 /* DW_CFA_restore %ebp */ | |
82 | .byte 0x04 /* DW_CFA_advance_loc4 */ | |
83 | .long .Lpop_edx-.Lpop_ebp | |
84 | .byte 0x0e /* DW_CFA_def_cfa_offset */ | |
85 | .byte 0x08 /* RA at offset 8 now */ | |
86 | .byte 0x04 /* DW_CFA_advance_loc4 */ | |
87 | .long .Lpop_ecx-.Lpop_edx | |
88 | .byte 0x0e /* DW_CFA_def_cfa_offset */ | |
89 | .byte 0x04 /* RA at offset 4 now */ | |
90 | .align 4 | |
91 | .LENDFDE1: | |
92 | ||
93 | #define SYSCALL_ENTER_KERNEL int $0x80 | |
94 | #include "vsyscall-sigreturn.S" |