projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | ||
| bb33421d | 9 | .code32 |
| 1da177e4 LT |
10 | .text |
| 11 | .section .text.vsyscall,"ax" | |
| 12 | .globl __kernel_vsyscall | |
| 13 | .type __kernel_vsyscall,@function | |
| 14 | __kernel_vsyscall: | |
| 15 | .LSTART_vsyscall: | |
| 16 | push %ebp | |
| 17 | .Lpush_ebp: | |
| 18 | movl %ecx, %ebp | |
| 19 | syscall | |
| 20 | movl $__USER32_DS, %ecx | |
| 21 | movl %ecx, %ss | |
| 22 | movl %ebp, %ecx | |
| 23 | popl %ebp | |
| 24 | .Lpop_ebp: | |
| 25 | ret | |
| 26 | .LEND_vsyscall: | |
| 27 | .size __kernel_vsyscall,.-.LSTART_vsyscall | |
| 28 | ||
| 29 | .section .eh_frame,"a",@progbits | |
| 30 | .LSTARTFRAME: | |
| 31 | .long .LENDCIE-.LSTARTCIE | |
| 32 | .LSTARTCIE: | |
| 33 | .long 0 /* CIE ID */ | |
| 34 | .byte 1 /* Version number */ | |
| 35 | .string "zR" /* NUL-terminated augmentation string */ | |
| 36 | .uleb128 1 /* Code alignment factor */ | |
| 37 | .sleb128 -4 /* Data alignment factor */ | |
| 38 | .byte 8 /* Return address register column */ | |
| 39 | .uleb128 1 /* Augmentation value length */ | |
| 40 | .byte 0x1b /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */ | |
| 41 | .byte 0x0c /* DW_CFA_def_cfa */ | |
| 42 | .uleb128 4 | |
| 43 | .uleb128 4 | |
| 44 | .byte 0x88 /* DW_CFA_offset, column 0x8 */ | |
| 45 | .uleb128 1 | |
| 46 | .align 4 | |
| 47 | .LENDCIE: | |
| 48 | ||
| 49 | .long .LENDFDE1-.LSTARTFDE1 /* Length FDE */ | |
| 50 | .LSTARTFDE1: | |
| 51 | .long .LSTARTFDE1-.LSTARTFRAME /* CIE pointer */ | |
| 52 | .long .LSTART_vsyscall-. /* PC-relative start address */ | |
| 53 | .long .LEND_vsyscall-.LSTART_vsyscall | |
| 54 | .uleb128 0 /* Augmentation length */ | |
| 55 | /* What follows are the instructions for the table generation. | |
| 56 | We have to record all changes of the stack pointer. */ | |
| 57 | .byte 0x40 + .Lpush_ebp-.LSTART_vsyscall /* DW_CFA_advance_loc */ | |
| 58 | .byte 0x0e /* DW_CFA_def_cfa_offset */ | |
| 59 | .uleb128 8 | |
| 60 | .byte 0x85, 0x02 /* DW_CFA_offset %ebp -8 */ | |
| 61 | .byte 0x40 + .Lpop_ebp-.Lpush_ebp /* DW_CFA_advance_loc */ | |
| 62 | .byte 0xc5 /* DW_CFA_restore %ebp */ | |
| 63 | .byte 0x0e /* DW_CFA_def_cfa_offset */ | |
| 64 | .uleb128 4 | |
| 65 | .align 4 | |
| 66 | .LENDFDE1: | |
| 67 | ||
| 68 | #define SYSCALL_ENTER_KERNEL syscall | |
| 69 | #include "vsyscall-sigreturn.S" |