| /* |
| * Code for the vDSO. This version uses the syscall instruction. |
| * |
| * First get the common code for the sigreturn entry points. |
| * This must come first. |
| */ |
| #define SYSCALL_ENTER_KERNEL syscall |
| #include "sigreturn.S" |
| |
| #include <asm/segment.h> |
| |
| .text |
| .globl __kernel_vsyscall |
| .type __kernel_vsyscall,@function |
| ALIGN |
| __kernel_vsyscall: |
| .LSTART_vsyscall: |
| push %ebp |
| .Lpush_ebp: |
| movl %ecx, %ebp |
| syscall |
| movl $__USER32_DS, %ecx |
| movl %ecx, %ss |
| movl %ebp, %ecx |
| popl %ebp |
| .Lpop_ebp: |
| ret |
| .LEND_vsyscall: |
| .size __kernel_vsyscall,.-.LSTART_vsyscall |
| |
| .section .eh_frame,"a",@progbits |
| .LSTARTFRAME: |
| .long .LENDCIE-.LSTARTCIE |
| .LSTARTCIE: |
| .long 0 /* CIE ID */ |
| .byte 1 /* Version number */ |
| .string "zR" /* NUL-terminated augmentation string */ |
| .uleb128 1 /* Code alignment factor */ |
| .sleb128 -4 /* Data alignment factor */ |
| .byte 8 /* Return address register column */ |
| .uleb128 1 /* Augmentation value length */ |
| .byte 0x1b /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */ |
| .byte 0x0c /* DW_CFA_def_cfa */ |
| .uleb128 4 |
| .uleb128 4 |
| .byte 0x88 /* DW_CFA_offset, column 0x8 */ |
| .uleb128 1 |
| .align 4 |
| .LENDCIE: |
| |
| .long .LENDFDE1-.LSTARTFDE1 /* Length FDE */ |
| .LSTARTFDE1: |
| .long .LSTARTFDE1-.LSTARTFRAME /* CIE pointer */ |
| .long .LSTART_vsyscall-. /* PC-relative start address */ |
| .long .LEND_vsyscall-.LSTART_vsyscall |
| .uleb128 0 /* Augmentation length */ |
| /* What follows are the instructions for the table generation. |
| We have to record all changes of the stack pointer. */ |
| .byte 0x40 + .Lpush_ebp-.LSTART_vsyscall /* DW_CFA_advance_loc */ |
| .byte 0x0e /* DW_CFA_def_cfa_offset */ |
| .uleb128 8 |
| .byte 0x85, 0x02 /* DW_CFA_offset %ebp -8 */ |
| .byte 0x40 + .Lpop_ebp-.Lpush_ebp /* DW_CFA_advance_loc */ |
| .byte 0xc5 /* DW_CFA_restore %ebp */ |
| .byte 0x0e /* DW_CFA_def_cfa_offset */ |
| .uleb128 4 |
| .align 4 |
| .LENDFDE1: |
| .previous |
| |
| /* |
| * Pad out the segment to match the size of the sysenter.S version. |
| */ |
| VDSO32_vsyscall_eh_frame_size = 0x40 |
| .section .data,"aw",@progbits |
| .space VDSO32_vsyscall_eh_frame_size-(.LENDFDE1-.LSTARTFRAME), 0 |
| .previous |