SYS.h revision 1.4 
1/*	$NetBSD: SYS.h,v 1.4 2015/01/12 02:48:20 dennis Exp $	*/
2
3#include <machine/asm.h>
4#include <sys/syscall.h>
5
6/*
7 * Inline what __cerror() is generally used to do since branching
8 * to __cerror() can't be done reliably with the powerpc64 ABI.
9 */
10#ifdef _REENTRANT
11#define	_DO_CERROR_SF_SZ	(SF_SZ + SF_ALIGN(8))
12#define	_DO_CERROR()		mflr	%r0				;\
13				streg	%r31,-8(%r1)			;\
14				streg	%r0,SF_LR(%r1)			;\
15				stptru	%r1,-_DO_CERROR_SF_SZ(%r1)	;\
16				mr	%r31,%r3			;\
17				bl	PIC_PLT(_C_LABEL(__errno))	;\
18				nop					;\
19				stint	%r31,0(%r3)			;\
20				addi	%r1,%r1,_DO_CERROR_SF_SZ	;\
21				ldreg	%r0,SF_LR(%r1)			;\
22				ldreg	%r31,-8(%r1)			;\
23				mtlr	%r0				;\
24				li	%r3,-1				;\
25				li	%r4,-1				;\
26				blr
27#else	/* !_REENTRANT */
28#define	_DO_CERROR()		lwz	%r4,_C_LABEL(errno)@got(%r2)	;\
29				stw	%r3,0(%r4)			;\
30				li	%r3,-1				;\
31				li	%r4,-1				;\
32				blr
33#endif	/* _REENTRANT */
34
35/* Clearly BRANCH_TO_CERROR() no longer does that... */
36#define	BRANCH_TO_CERROR()	_DO_CERROR()
37
38#define	_DOSYSCALL(x)		li	%r0,(SYS_ ## x)		;\
39				sc
40
41#define	_SYSCALL_NOERROR(x,y)	.text				;\
42				.p2align 2			;\
43			ENTRY(x)				;\
44				_DOSYSCALL(y)
45
46#define _SYSCALL(x,y)		.text				;\
47				.p2align 2			;\
48			2:	_DO_CERROR()			;\
49				_SYSCALL_NOERROR(x,y)		;\
50				bso	2b
51
52#define SYSCALL_NOERROR(x)	_SYSCALL_NOERROR(x,x)
53
54#define SYSCALL(x)		_SYSCALL(x,x)
55
56#define PSEUDO_NOERROR(x,y)	_SYSCALL_NOERROR(x,y)		;\
57				blr				;\
58				END(x)
59
60#define PSEUDO(x,y)		_SYSCALL_NOERROR(x,y)		;\
61				bnslr				;\
62				_DO_CERROR()			;\
63				END(x)
64
65#define RSYSCALL_NOERROR(x)	PSEUDO_NOERROR(x,x)
66
67#define RSYSCALL(x)		PSEUDO(x,x)
68
69#define	WSYSCALL(weak,strong)	WEAK_ALIAS(weak,strong)		;\
70				PSEUDO(strong,weak)
71