Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Code for the vsyscall page. This version uses the old int $0x80 method. | |
3 | * | |
4 | * NOTE: | |
5 | * 1) __kernel_vsyscall _must_ be first in this page. | |
6 | * 2) there are alignment constraints on this stub, see vsyscall-sigreturn.S | |
7 | * for details. | |
8 | */ | |
9 | ||
10 | .text | |
11 | .globl __kernel_vsyscall | |
12 | .type __kernel_vsyscall,@function | |
13 | __kernel_vsyscall: | |
14 | .LSTART_vsyscall: | |
15 | int $0x80 | |
16 | ret | |
17 | .LEND_vsyscall: | |
18 | .size __kernel_vsyscall,.-.LSTART_vsyscall | |
19 | .previous | |
20 | ||
21 | .section .eh_frame,"a",@progbits | |
22 | .LSTARTFRAMEDLSI: | |
23 | .long .LENDCIEDLSI-.LSTARTCIEDLSI | |
24 | .LSTARTCIEDLSI: | |
25 | .long 0 /* CIE ID */ | |
26 | .byte 1 /* Version number */ | |
27 | .string "zR" /* NUL-terminated augmentation string */ | |
28 | .uleb128 1 /* Code alignment factor */ | |
29 | .sleb128 -4 /* Data alignment factor */ | |
30 | .byte 8 /* Return address register column */ | |
31 | .uleb128 1 /* Augmentation value length */ | |
32 | .byte 0x1b /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */ | |
33 | .byte 0x0c /* DW_CFA_def_cfa */ | |
34 | .uleb128 4 | |
35 | .uleb128 4 | |
36 | .byte 0x88 /* DW_CFA_offset, column 0x8 */ | |
37 | .uleb128 1 | |
38 | .align 4 | |
39 | .LENDCIEDLSI: | |
40 | .long .LENDFDEDLSI-.LSTARTFDEDLSI /* Length FDE */ | |
41 | .LSTARTFDEDLSI: | |
42 | .long .LSTARTFDEDLSI-.LSTARTFRAMEDLSI /* CIE pointer */ | |
43 | .long .LSTART_vsyscall-. /* PC-relative start address */ | |
44 | .long .LEND_vsyscall-.LSTART_vsyscall | |
45 | .uleb128 0 | |
46 | .align 4 | |
47 | .LENDFDEDLSI: | |
48 | .previous | |
49 | ||
50 | /* | |
51 | * Get the common code for the sigreturn entry points. | |
52 | */ | |
53 | #include "vsyscall-sigreturn.S" |