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cerror.S revision 1.1 
      1 /*	$NetBSD: cerror.S,v 1.1 2014/09/19 17:36:25 matt 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 	RCSID("$NetBSD: cerror.S,v 1.1 2014/09/19 17:36:25 matt Exp $")
     39 #endif /* LIBC_SCCS and not lint */
     40 
     41 	.protected	_C_LABEL(__cerror)
     42 
     43 	.globl	_C_LABEL(__errno)
     44 ENTRY_NP(__cerror)
     45 #ifdef _REENTRANT
     46 	addi		sp, sp, -CALLFRAME_SIZ
     47 	REG_S		ra, CALLFRAME_RA(sp)	# save return address
     48 	sw		v0, CALLFRAME_S0(sp)	# save errno value
     49 
     50 	call		PLT(_C_LABEL(__errno))	# locate address of errno
     51 
     52 	lw		t0, CALLFRAME_S0(sp)	# retrieve errno value
     53 	REG_L		ra, CALLFRAME_RA(sp)	# retrieve return address
     54 	sw		t0, 0(v0)		# update errno value
     55 	addi		sp, sp, CALLFRAME_SIZ
     56 #else
     57 	aiupc		v1, %hi(_C_LABEL(errno))
     58 	sw		v0, %lo(_C_LABEL(errno))(v1)
     59 #endif /* _REENTRANT */
     60 	li		v0, -1
     61 	li		v1, -1
     62 	ret
     63 END(__cerror)
     64