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cerror.S revision 1.19 
      1 /*	$NetBSD: cerror.S,v 1.19 2013/09/12 15:36:15 joerg Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1991, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Ralph Campbell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 #include "SYS.h"
     36 
     37 #if defined(LIBC_SCCS) && !defined(lint)
     38 #if 0
     39 	RCSID("from: @(#)cerror.s	8.1 (Berkeley) 6/16/93")
     40 #else
     41 	RCSID("$NetBSD: cerror.S,v 1.19 2013/09/12 15:36:15 joerg Exp $")
     42 #endif
     43 #endif /* LIBC_SCCS and not lint */
     44 
     45 #ifdef __PIC__
     46 	.protected	__cerror
     47 #endif
     48 
     49 #ifdef _REENTRANT
     50 	.globl	_C_LABEL(__errno)
     51 NESTED_NOPROFILE(__cerror, CALLFRAME_SIZ, ra)
     52 	.mask	0x80000000, (CALLFRAME_RA - CALLFRAME_SIZ)
     53 	PIC_PROLOGUE(__cerror)
     54 	PTR_SUBU	sp, CALLFRAME_SIZ
     55 	PTR_S		ra, CALLFRAME_RA(sp)
     56 	INT_S		v0, CALLFRAME_S0(sp)	# save errno value
     57 
     58 	SAVE_GP(CALLFRAME_GP)
     59 
     60 	PTR_LA		t9, _C_LABEL(__errno)	# locate address of errno
     61 	RESTORE_GP64				# restore GP (from t3)
     62 	jalr		t9			# __errno()
     63 
     64 	INT_L		t0, CALLFRAME_S0(sp)
     65 	PTR_L		ra, CALLFRAME_RA(sp)
     66 	INT_S		t0, 0(v0)		# update errno value
     67 	PTR_ADDU	sp, CALLFRAME_SIZ
     68 	li		v0, -1
     69 	li		v1, -1
     70 	j		ra			# GP has been restored.
     71 END(__cerror)
     72 #else
     73 	.globl	_C_LABEL(errno)
     74 LEAF_NOPROFILE(__cerror)
     75 	PIC_PROLOGUE(__cerror)
     76 	INT_S		v0, _C_LABEL(errno)
     77 	li		v0, -1
     78 	li		v1, -1
     79 	PIC_RETURN()
     80 END(__cerror)
     81 #endif /* _REENTRANT */
     82