arch/i386/syscall.S

/*
 * arch/i386/syscall.S
 *
 * Common tail-handling code for system calls.
 *
 * The arguments are on the stack; the system call number in %eax.
 */

#define ARG(n)	(4*n+20)(%esp)

	.text
	.align	4
	.globl	__syscall_common
	.type	__syscall_common,@function
__syscall_common:
#ifdef _REGPARM
	xchgl	%ebx,(%esp)
#else
	popl	%eax
	pushl	%ebx
#endif
	pushl	%esi
	pushl	%edi
	pushl	%ebp

#ifdef _REGPARM
	xchgl	%eax,%ebx
	xchgl	%ecx,%edx
	movl	ARG(0),%esi
	movl	ARG(1),%edi
	movl	ARG(2),%ebp
#else
	movl	ARG(0),%ebx		# Syscall arguments
	movl	ARG(1),%ecx
	movl	ARG(2),%edx
	movl	ARG(3),%esi
	movl	ARG(4),%edi
	movl	ARG(5),%ebp
#endif
	.globl __syscall_common_tail
__syscall_common_tail:
	int	$0x80

	cmpl	$-4095,%eax

	popl	%ebp
	popl	%edi
	popl	%esi
	popl	%ebx

	jb	1f

	# Error return, must set errno
	negl	%eax
	movl	%eax,errno
	orl	$-1,%eax		# Return -1

1:
	ret

	.size	__syscall_common,.-__syscall_common

#ifndef _REGPARM

	.globl	__syscall_varadic
	.type	__syscall_varadic,@function
__syscall_varadic = __syscall_common

#endif
1	niro	532	/*
2			* arch/i386/syscall.S
3			*
4			* Common tail-handling code for system calls.
5			*
6			* The arguments are on the stack; the system call number in %eax.
7			*/
8
9			#define ARG(n) (4*n+20)(%esp)
10
11			.text
12			.align 4
13			.globl __syscall_common
14			.type __syscall_common,@function
15			__syscall_common:
16			#ifdef _REGPARM
17			xchgl %ebx,(%esp)
18			#else
19			popl %eax
20			pushl %ebx
21			#endif
22			pushl %esi
23			pushl %edi
24			pushl %ebp
25
26			#ifdef _REGPARM
27			xchgl %eax,%ebx
28			xchgl %ecx,%edx
29			movl ARG(0),%esi
30			movl ARG(1),%edi
31			movl ARG(2),%ebp
32			#else
33			movl ARG(0),%ebx # Syscall arguments
34			movl ARG(1),%ecx
35			movl ARG(2),%edx
36			movl ARG(3),%esi
37			movl ARG(4),%edi
38			movl ARG(5),%ebp
39			#endif
40			.globl __syscall_common_tail
41			__syscall_common_tail:
42			int $0x80
43
44			cmpl $-4095,%eax
45
46			popl %ebp
47			popl %edi
48			popl %esi
49			popl %ebx
50
51			jb 1f
52
53			# Error return, must set errno
54			negl %eax
55			movl %eax,errno
56			orl $-1,%eax # Return -1
57
58			1:
59			ret
60
61			.size __syscall_common,.-__syscall_common
62
63			#ifndef _REGPARM
64
65			.globl __syscall_varadic
66			.type __syscall_varadic,@function
67			__syscall_varadic = __syscall_common
68
69			#endif