| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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" |