linux/arch/x86/ia32/vsyscall-syscall.S

/*
 * 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"
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! 2005-04-16 15:20:36 -07:00			`/*`
			`* Code for the vsyscall page. This version uses the syscall instruction.`
			`*/`

			`#include <asm/ia32_unistd.h>`
kbuild: alpha,x86_64 use generic asm-offsets.h support Delete obsolete stuff from arch makefiles Rename .h file to asm-offsets.h Signed-off-by: Sam Ravnborg <sam@ravnborg.org> 2005-09-09 21:28:48 +02:00			`#include <asm/asm-offsets.h>`
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! 2005-04-16 15:20:36 -07:00			`#include <asm/segment.h>`

[PATCH] x86_64: Allow compilation on a 32bit biarch toolchain This might help on distributions that use a 32bit biarch compiler. First pass -m64 by default. Secondly add some more .code32s because at least the Ubuntu biarch 32bit as called by gcc doesn't seem to handle -m64 -m32 as generated by the Makefile without such assistance. And finally make sure the linker script can be preprocessed with a 32bit cpp. Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org> 2006-01-11 22:43:54 +01:00			`.code32`
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! 2005-04-16 15:20:36 -07:00			`.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"`