2 * Code for the vsyscall page. This version uses the syscall instruction.
5 #include <asm/asm-offsets.h>
6 #include <asm/segment.h>
9 .globl __kernel_vsyscall
10 .type __kernel_vsyscall,@function
17 movl $__USER32_DS, %ecx
24 .size __kernel_vsyscall,.-.LSTART_vsyscall
26 .section .eh_frame,"a",@progbits
28 .long .LENDCIE-.LSTARTCIE
31 .byte 1 /* Version number */
32 .string "zR" /* NUL-terminated augmentation string */
33 .uleb128 1 /* Code alignment factor */
34 .sleb128 -4 /* Data alignment factor */
35 .byte 8 /* Return address register column */
36 .uleb128 1 /* Augmentation value length */
37 .byte 0x1b /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */
38 .byte 0x0c /* DW_CFA_def_cfa */
41 .byte 0x88 /* DW_CFA_offset, column 0x8 */
46 .long .LENDFDE1-.LSTARTFDE1 /* Length FDE */
48 .long .LSTARTFDE1-.LSTARTFRAME /* CIE pointer */
49 .long .LSTART_vsyscall-. /* PC-relative start address */
50 .long .LEND_vsyscall-.LSTART_vsyscall
51 .uleb128 0 /* Augmentation length */
52 /* What follows are the instructions for the table generation.
53 We have to record all changes of the stack pointer. */
54 .byte 0x40 + .Lpush_ebp-.LSTART_vsyscall /* DW_CFA_advance_loc */
55 .byte 0x0e /* DW_CFA_def_cfa_offset */
57 .byte 0x85, 0x02 /* DW_CFA_offset %ebp -8 */
58 .byte 0x40 + .Lpop_ebp-.Lpush_ebp /* DW_CFA_advance_loc */
59 .byte 0xc5 /* DW_CFA_restore %ebp */
60 .byte 0x0e /* DW_CFA_def_cfa_offset */
66 * Get the common code for the sigreturn entry points.
68 #define SYSCALL_ENTER_KERNEL syscall
69 #include "sigreturn.S"