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      1 /*	$NetBSD: getcontext.S,v 1.10 2013/09/03 00:30:19 matt Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2001 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Klaus Klein.
      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  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include "SYS.h"
     33 #include "assym.h"
     34 
     35 #if defined(SYSLIBC_SCCS) && !defined(lint)
     36 	RCSID("$NetBSD: getcontext.S,v 1.10 2013/09/03 00:30:19 matt Exp $")
     37 #endif /* SYSLIBC_SCCS && !lint */
     38 
     39 #ifdef WEAK_ALIAS
     40 WEAK_ALIAS(getcontext, _getcontext)
     41 #endif
     42 
     43 ENTRY(_getcontext)
     44 	mov	r2, r0			/* Must save argument pointer. */
     45 	SYSTRAP (getcontext)
     46 	_INVOKE_CERROR()
     47 #if !defined(__thumb__) || defined(_ARM_ARCH_T2)
     48 	str	lr, [r2, #_UC_REGS_PC]	/* Adjust PC. */
     49 #else
     50 	mov	r3, lr
     51 	str	r3, [r2, #_UC_REGS_PC]	/* Adjust PC. */
     52 #endif
     53 #ifdef SOFTFLOAT
     54 	/* Ahem. */
     55 	/* Judging from the softfloat code we should at least save
     56 	   the exception codes and rounding mode here. */
     57 #endif
     58 	movs	r0, #0
     59 	str	r0, [r2, #_UC_REGS_R0]	/* Return 0. */
     60 	RET
     61 END(_getcontext)
     62