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49 lines
1.7 KiB
C
49 lines
1.7 KiB
C
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/* Copyright (C) 2001 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Jakub Jelinek <jakub@redhat.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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <ucontext.h>
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extern int __getcontext (ucontext_t *ucp);
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extern int __setcontext (const ucontext_t *ucp, int restoremask);
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int
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__swapcontext (ucontext_t *oucp, const ucontext_t *ucp)
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{
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extern void __swapcontext_ret (void);
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/* Save the current machine context to oucp. */
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__getcontext (oucp);
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/* Modify oucp to skip the __setcontext call on reactivation. */
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oucp->uc_mcontext.mc_gregs[MC_PC] = (long) __swapcontext_ret;
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oucp->uc_mcontext.mc_gregs[MC_NPC] = ((long) __swapcontext_ret) + 4;
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/* Restore the machine context in ucp. */
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__setcontext (ucp, 1);
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return 0;
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}
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asm (" \n\
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.text \n\
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.type __swapcontext_ret, #function \n\
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__swapcontext_ret: \n\
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return %i7 + 8 \n\
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clr %o0 \n\
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.size __swapcontext_ret, .-__swapcontext_ret \n\
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");
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weak_alias (__swapcontext, swapcontext)
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