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58 lines
1.9 KiB
C
58 lines
1.9 KiB
C
/* Copyright (C) 2001-2020 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 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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<https://www.gnu.org/licenses/>. */
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <ucontext.h>
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extern void __start_context (ucontext_t *ucp);
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void
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__makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
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{
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extern void __makecontext_ret (void);
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unsigned long *sp, *topsp;
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va_list ap;
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int i;
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sp = (unsigned long *) ((long) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size);
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sp -= (argc > 6 ? argc : 6) + 32;
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sp = (unsigned long *) (((long) sp) & -16L);
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topsp = sp + (argc > 6 ? argc : 6) + 16;
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ucp->uc_mcontext.mc_gregs[MC_PC] = (long) func;
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ucp->uc_mcontext.mc_gregs[MC_NPC] = ((long) func) + 4;
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ucp->uc_mcontext.mc_gregs[MC_O6] = ((long) sp) - 0x7ff;
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ucp->uc_mcontext.mc_gregs[MC_O7] = ((long) __start_context) - 8;
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ucp->uc_mcontext.mc_fp = ((long) topsp) - 0x7ff;
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ucp->uc_mcontext.mc_i7 = 0;
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topsp[14] = 0;
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topsp[15] = 0;
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sp[8] = (long) ucp->uc_link;
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va_start (ap, argc);
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for (i = 0; i < argc; ++i)
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if (i < 6)
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ucp->uc_mcontext.mc_gregs[MC_O0 + i] = va_arg (ap, long);
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else
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sp[16 + i] = va_arg (ap, long);
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va_end (ap);
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}
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weak_alias (__makecontext, makecontext)
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