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109 lines
3.2 KiB
ArmAsm
109 lines
3.2 KiB
ArmAsm
/* Copyright (C) 2002-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <features.h>
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#include "ucontext_i.h"
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/* __swapcontext (ucontext_t *oucp, const ucontext_t *ucp)
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Saves the machine context in oucp such that when it is activated,
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it appears as if __swapcontext() returned again, restores the
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machine context in ucp and thereby resumes execution in that
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context.
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This implementation is intended to be used for *synchronous* context
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switches only. Therefore, it does not have to save anything
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other than the PRESERVED state. */
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ENTRY(__swapcontext)
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/* While not part of the ABI a system call never clobbers r0
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or r1. So keeping the values here while calling
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rt_sigprocmask is ok. */
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lgr %r1,%r2
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lgr %r0,%r3
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/* Store fpu context. */
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stfpc SC_FPC(%r1)
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std %f0,SC_FPRS(%r1)
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std %f1,SC_FPRS+8(%r1)
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std %f2,SC_FPRS+16(%r1)
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std %f3,SC_FPRS+24(%r1)
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std %f4,SC_FPRS+32(%r1)
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std %f5,SC_FPRS+40(%r1)
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std %f6,SC_FPRS+48(%r1)
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std %f7,SC_FPRS+56(%r1)
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std %f8,SC_FPRS+64(%r1)
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std %f9,SC_FPRS+72(%r1)
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std %f10,SC_FPRS+80(%r1)
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std %f11,SC_FPRS+88(%r1)
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std %f12,SC_FPRS+96(%r1)
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std %f13,SC_FPRS+104(%r1)
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std %f14,SC_FPRS+112(%r1)
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std %f15,SC_FPRS+120(%r1)
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/* Set __swapcontext return value to 0. */
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slgr %r2,%r2
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/* Store access registers. */
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stam %a0,%a15,SC_ACRS(%r1)
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/* Store general purpose registers. */
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stmg %r0,%r15,SC_GPRS(%r1)
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/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, &oucp->uc_sigmask,
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sigsetsize). */
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la %r2,SIG_SETMASK
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lgr %r5,%r0
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la %r3,SC_MASK(%r5)
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la %r4,SC_MASK(%r1)
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lghi %r5,_NSIG8
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svc SYS_ify(rt_sigprocmask)
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/* Load fpu context. */
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lgr %r5,%r0
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lfpc SC_FPC(%r5)
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ld %f0,SC_FPRS(%r5)
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ld %f1,SC_FPRS+8(%r5)
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ld %f2,SC_FPRS+16(%r5)
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ld %f3,SC_FPRS+24(%r5)
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ld %f4,SC_FPRS+32(%r5)
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ld %f5,SC_FPRS+40(%r5)
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ld %f6,SC_FPRS+48(%r5)
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ld %f7,SC_FPRS+56(%r5)
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ld %f8,SC_FPRS+64(%r5)
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ld %f9,SC_FPRS+72(%r5)
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ld %f10,SC_FPRS+80(%r5)
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ld %f11,SC_FPRS+88(%r5)
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ld %f12,SC_FPRS+96(%r5)
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ld %f13,SC_FPRS+104(%r5)
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ld %f14,SC_FPRS+112(%r5)
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ld %f15,SC_FPRS+120(%r5)
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/* Don't touch %a0 and %a1, used for thread purposes. */
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lam %a2,%a15,SC_ACRS+8(%r5)
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/* Load general purpose registers. */
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lmg %r0,%r15,SC_GPRS(%r5)
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/* Return. */
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br %r14
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END(__swapcontext)
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weak_alias (__swapcontext, swapcontext)
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