projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 00f8b1bc | 1 | /* |
| 69d0627a RM |
2 | * Code for the vDSO. This version uses the syscall instruction. |
| 3 | * | |
| 4 | * First get the common code for the sigreturn entry points. | |
| 5 | * This must come first. | |
| 00f8b1bc | 6 | */ |
| 69d0627a RM |
7 | #define SYSCALL_ENTER_KERNEL syscall |
| 8 | #include "sigreturn.S" | |
| 00f8b1bc | 9 | |
| 00f8b1bc RM |
10 | #include <asm/segment.h> |
| 11 | ||
| 12 | .text | |
| 13 | .globl __kernel_vsyscall | |
| 14 | .type __kernel_vsyscall,@function | |
| 69d0627a | 15 | ALIGN |
| 00f8b1bc RM |
16 | __kernel_vsyscall: |
| 17 | .LSTART_vsyscall: | |
| 18 | push %ebp | |
| 19 | .Lpush_ebp: | |
| 20 | movl %ecx, %ebp | |
| 21 | syscall | |
| 00f8b1bc RM |
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: | |
| 69d0627a | 67 | .previous |
| 00f8b1bc | 68 | |
| 69d0627a RM |
69 | /* |
| 70 | * Pad out the segment to match the size of the sysenter.S version. | |
| 71 | */ | |
| cadd5164 | 72 | VDSO32_vsyscall_eh_frame_size = 0x40 |
| 69d0627a RM |
73 | .section .data,"aw",@progbits |
| 74 | .space VDSO32_vsyscall_eh_frame_size-(.LENDFDE1-.LSTARTFRAME), 0 | |
| 75 | .previous |