2013-12-06 12:04:52 +01:00
|
|
|
/* $NetBSD: swapcontext.S,v 1.14 2013/11/30 20:20:42 joerg Exp $ */
|
2011-02-14 20:36:03 +01:00
|
|
|
|
|
|
|
/*-
|
|
|
|
* Copyright (c) 2001 The NetBSD Foundation, Inc.
|
|
|
|
* All rights reserved.
|
|
|
|
*
|
|
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
|
|
* by Klaus Klein.
|
|
|
|
*
|
|
|
|
* Redistribution and use in source and binary forms, with or without
|
|
|
|
* modification, are permitted provided that the following conditions
|
|
|
|
* are met:
|
|
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
|
|
* notice, this list of conditions and the following disclaimer.
|
|
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
|
|
* documentation and/or other materials provided with the distribution.
|
|
|
|
*
|
|
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include "SYS.h"
|
2012-11-15 12:06:41 +01:00
|
|
|
#include "assym.h"
|
2011-02-14 20:36:03 +01:00
|
|
|
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
2013-12-06 12:04:52 +01:00
|
|
|
RCSID("$NetBSD: swapcontext.S,v 1.14 2013/11/30 20:20:42 joerg Exp $")
|
2011-02-14 20:36:03 +01:00
|
|
|
#endif /* LIBC_SCCS && !lint */
|
|
|
|
|
|
|
|
ENTRY(swapcontext)
|
2013-12-06 12:04:52 +01:00
|
|
|
#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__)
|
|
|
|
.fnstart
|
|
|
|
.cfi_startproc
|
|
|
|
#endif
|
|
|
|
push {r0-r2, lr} /* Must save oucp, ucp, lr. */
|
|
|
|
#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__)
|
|
|
|
.save {r0-r2, lr}
|
|
|
|
.cfi_def_cfa_offset 16
|
|
|
|
.cfi_offset 14, -4
|
|
|
|
.cfi_offset 2, -8
|
|
|
|
.cfi_offset 1, -12
|
|
|
|
.cfi_offset 0, -16
|
|
|
|
#endif
|
|
|
|
bl PLT_SYM(_C_LABEL(_getcontext)) /* getcontext(oucp) */
|
2011-02-14 20:36:03 +01:00
|
|
|
cmp r0, #0
|
2013-12-06 12:04:52 +01:00
|
|
|
#if !defined(__thumb__)
|
|
|
|
pop {r0-r2, lr}
|
|
|
|
#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__)
|
|
|
|
.cfi_def_cfa_offset 0
|
|
|
|
#endif
|
2011-02-14 20:36:03 +01:00
|
|
|
RETc(ne)
|
2013-12-06 12:04:52 +01:00
|
|
|
#else
|
|
|
|
pop {r0-r3}
|
|
|
|
beq 1f
|
|
|
|
#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__)
|
|
|
|
.cfi_def_cfa_offset 0
|
|
|
|
.cfi_register 14, 3
|
|
|
|
#endif
|
|
|
|
RETr(r3)
|
|
|
|
1:
|
|
|
|
#endif
|
|
|
|
#if !defined(__thumb__)
|
2012-11-15 12:06:41 +01:00
|
|
|
str sp, [r0, #_UC_REGS_SP] /* Adjust saved SP. */
|
2013-12-06 12:04:52 +01:00
|
|
|
str lr, [r0, #_UC_REGS_PC] /* Adjust saved SP. */
|
|
|
|
#else
|
|
|
|
mov r2, sp
|
|
|
|
str r2, [r0, #_UC_REGS_SP] /* Adjust saved SP. */
|
|
|
|
str r3, [r0, #_UC_REGS_PC] /* Adjust saved PC. */
|
|
|
|
mov lr, r3
|
|
|
|
#endif
|
2011-02-14 20:36:03 +01:00
|
|
|
#ifdef SOFTFLOAT
|
|
|
|
/* Ahem. */
|
|
|
|
#endif
|
|
|
|
mov r0, r1
|
2013-12-06 12:04:52 +01:00
|
|
|
#if !defined(__thumb__) || defined(_ARM_ARCH_T2)
|
|
|
|
b PLT_SYM(_C_LABEL(setcontext))
|
|
|
|
#else
|
|
|
|
push {lr}
|
|
|
|
bl PLT_SYM(_C_LABEL(setcontext))
|
|
|
|
pop {pc}
|
|
|
|
#endif
|
|
|
|
#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__)
|
|
|
|
.cfi_endproc
|
|
|
|
.fnend
|
|
|
|
#endif
|
|
|
|
END(swapcontext)
|