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/* Copyright (C) 2001-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <ucontext.h>
extern void __start_context (ucontext_t *ucp);
void
__makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
{
extern void __makecontext_ret (void);
unsigned long *sp, *topsp;
va_list ap;
int i;
sp = (unsigned long *) ((long) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size);
sp -= (argc > 6 ? argc : 6) + 32;
sp = (unsigned long *) (((long) sp) & -16L);
topsp = sp + (argc > 6 ? argc : 6) + 16;
ucp->uc_mcontext.mc_gregs[MC_PC] = (long) func;
ucp->uc_mcontext.mc_gregs[MC_NPC] = ((long) func) + 4;
ucp->uc_mcontext.mc_gregs[MC_O6] = ((long) sp) - 0x7ff;
ucp->uc_mcontext.mc_gregs[MC_O7] = ((long) __start_context) - 8;
ucp->uc_mcontext.mc_fp = ((long) topsp) - 0x7ff;
ucp->uc_mcontext.mc_i7 = 0;
topsp[14] = 0;
topsp[15] = 0;
sp[8] = (long) ucp->uc_link;
va_start (ap, argc);
for (i = 0; i < argc; ++i)
if (i < 6)
ucp->uc_mcontext.mc_gregs[MC_O0 + i] = va_arg (ap, long);
else
sp[16 + i] = va_arg (ap, long);
va_end (ap);
}
weak_alias (__makecontext, makecontext)
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