0a6a1f1d05
This brings our tree to NetBSD 7.0, as found on -current on the 10-10-2015. This updates: - LLVM to 3.6.1 - GCC to GCC 5.1 - Replace minix/commands/zdump with usr.bin/zdump - external/bsd/libelf has moved to /external/bsd/elftoolchain/ - Import ctwm - Drop sprintf from libminc Change-Id: I149836ac18e9326be9353958bab9b266efb056f0
76 lines
2.9 KiB
ArmAsm
76 lines
2.9 KiB
ArmAsm
/* $NetBSD: swapcontext.S,v 1.1 2014/09/03 19:34:25 matt Exp $ */
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/*-
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* Copyright (c) 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Klaus Klein.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "SYS.h"
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#include "assym.h"
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__RCSID("$NetBSD: swapcontext.S,v 1.1 2014/09/03 19:34:25 matt Exp $")
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#define CALLFRAME_LR (-1*4)
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#define CALLFRAME_UCP (-2*4)
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#define CALLFRAME_OUCP (-3*4)
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#define CALLFRAME_GP (-4*4)
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#define CALLFRAME_SP (-5*4)
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#define CALLFRAME_LEN (-CALLFRAME_SP)
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ENTRY(swapcontext)
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l.sw CALLFRAME_LR(r1),lr # save link register
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l.sw CALLFRAME_OUCP(r1),r3 # save oucp
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l.sw CALLFRAME_UCP(r1),r4 # save ucp
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l.sw CALLFRAME_SP(r1),r1 # set up stack chain
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#ifdef __PIC__
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l.sw CALLFRAME_GP(r1),r16 # save r16
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PIC_GOTSETUP(r16) # setup got pointer
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#endif
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l.addi r1,r1,-CALLFRAME_LEN # adjust stack
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l.jal PLT(_C_LABEL(_getcontext)) # getcontext(oucp)
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l.nop # -- delay slot --
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l.sfeqi r11,0 # error?
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l.bnf 1f # yes, cleanup
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l.nop # -- delay slot --
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l.addi r5,r1,CALLFRAME_LEN # adjust stack
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l.lwz r4,CALLFRAME_OUCP(r5) # load oucp for adjustment
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l.sw UC_GREGS_PC(r4),lr # pc <- lr
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l.sw UC_GREGS_SP(r4),r1 # adjust sp
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l.lwz r3,CALLFRAME_UCP(r5) # load ucp
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# can't do a tail call due to needing r16 for PLT
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l.jal PLT(_C_LABEL(setcontext)) # setcontext(ucp)
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l.nop # -- delay slot --
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1:
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l.addi r1,r1,CALLFRAME_LEN # restore stack
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#ifdef __PIC__
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l.lwz r16,CALLFRAME_GP(r1) # restore r16
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#endif
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l.lwz lr,CALLFRAME_LR(r1) # refetch lr
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l.jr lr # simply return
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l.nop # -- delay slot --
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END(swapcontext)
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