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)+24)(%esp)
#define SYSNO	ARG(-2)

	.text
	.align	4
	.globl	__syscall_common
	.type	__syscall_common,@function
__syscall_common:
	pushl	%ebx
	pushl	%esi
	pushl	%edi
	pushl	%ebp

#ifdef _REGPARM
	xchgl	%ecx,%edx
	movl	%eax,%ebx
	movl	SYSNO,%eax
	movl	ARG(0),%esi
	movl	ARG(1),%edi
	movl	ARG(2),%ebp
#else
	movl	SYSNO,%eax
	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
	popl	%edx			# Drop system call number

	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	niro	815	#define ARG(n) (4*(n)+24)(%esp)
10			#define SYSNO ARG(-2)
11	niro	532
12			.text
13			.align 4
14			.globl __syscall_common
15			.type __syscall_common,@function
16			__syscall_common:
17			pushl %ebx
18			pushl %esi
19			pushl %edi
20			pushl %ebp
21
22			#ifdef _REGPARM
23			xchgl %ecx,%edx
24	niro	815	movl %eax,%ebx
25			movl SYSNO,%eax
26	niro	532	movl ARG(0),%esi
27			movl ARG(1),%edi
28			movl ARG(2),%ebp
29			#else
30	niro	815	movl SYSNO,%eax
31	niro	532	movl ARG(0),%ebx # Syscall arguments
32			movl ARG(1),%ecx
33			movl ARG(2),%edx
34			movl ARG(3),%esi
35			movl ARG(4),%edi
36			movl ARG(5),%ebp
37			#endif
38			.globl __syscall_common_tail
39			__syscall_common_tail:
40			int $0x80
41
42			cmpl $-4095,%eax
43
44			popl %ebp
45			popl %edi
46			popl %esi
47			popl %ebx
48	niro	815	popl %edx # Drop system call number
49	niro	532
50			jb 1f
51
52			# Error return, must set errno
53			negl %eax
54			movl %eax,errno
55			orl $-1,%eax # Return -1
56
57			1:
58			ret
59
60			.size __syscall_common,.-__syscall_common
61
62			#ifndef _REGPARM
63
64			.globl __syscall_varadic
65			.type __syscall_varadic,@function
66			__syscall_varadic = __syscall_common
67
68			#endif