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| author |   Thomas Gleixner <tglx@linutronix.de> | 2007-10-11 11:17:21 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2007-10-11 11:17:21 +0200 |
| commit | 2db55d344e529492545cb3b755c7e9ba8e4fa94e (patch) | |
| tree | fea163affb8eec3d927acb498cb3aa1b13c053b8 /arch/x86/ia32/vsyscall-syscall.S | |
| parent | x86_64: move oprofile (diff) | |
| download | linux-dev-2db55d344e529492545cb3b755c7e9ba8e4fa94e.tar.xz linux-dev-2db55d344e529492545cb3b755c7e9ba8e4fa94e.zip | |
x86_64: move ia32
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/ia32/vsyscall-syscall.S')
| -rw-r--r-- | arch/x86/ia32/vsyscall-syscall.S | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/arch/x86/ia32/vsyscall-syscall.S b/arch/x86/ia32/vsyscall-syscall.S new file mode 100644 index 000000000000..cf9ef678de3e --- /dev/null +++ b/arch/x86/ia32/vsyscall-syscall.S @@ -0,0 +1,69 @@ +/* + * Code for the vsyscall page. This version uses the syscall instruction. + */ + +#include <asm/ia32_unistd.h> +#include <asm/asm-offsets.h> +#include <asm/segment.h> + + .code32 + .text + .section .text.vsyscall,"ax" + .globl __kernel_vsyscall + .type __kernel_vsyscall,@function +__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: + +#define SYSCALL_ENTER_KERNEL syscall +#include "vsyscall-sigreturn.S" |