/*-
* Copyright (c) 2003 Jake Burkholder.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/sparc64/gen/makecontext.c,v 1.1.34.1.2.1 2009/10/25 01:10:29 kensmith Exp $");
#include <sys/param.h>
#include <sys/signal.h>
#include <sys/ucontext.h>
#include <machine/frame.h>
#include <machine/tstate.h>
#include <errno.h>
#include <stdarg.h>
#include <stdlib.h>
#include <unistd.h>
__weak_reference(__makecontext, makecontext);
void _ctx_done(ucontext_t *ucp);
void _ctx_start(void);
void
__makecontext(ucontext_t *ucp, void (*start)(void), int argc, ...)
{
mcontext_t *mc;
uint64_t sp;
va_list ap;
int i;
mc = &ucp->uc_mcontext;
if (ucp == NULL ||
(mc->mc_flags & ((1L << _MC_VERSION_BITS) - 1)) != _MC_VERSION)
return;
if ((argc < 0) || (argc > 6) ||
(ucp->uc_stack.ss_sp == NULL) ||
(ucp->uc_stack.ss_size < MINSIGSTKSZ)) {
mc->mc_flags = 0;
return;
}
mc = &ucp->uc_mcontext;
sp = (uint64_t)ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size;
va_start(ap, argc);
for (i = 0; i < argc; i++)
mc->mc_out[i] = va_arg(ap, uint64_t);
va_end(ap);
mc->mc_global[1] = (uint64_t)start;
mc->mc_global[2] = (uint64_t)ucp;
mc->mc_out[6] = sp - SPOFF - sizeof(struct frame);
mc->mc_tnpc = (uint64_t)_ctx_start + 4;
mc->mc_tpc = (uint64_t)_ctx_start;
}
void
_ctx_done(ucontext_t *ucp)
{
if (ucp->uc_link == NULL)
exit(0);
else {
ucp->uc_mcontext.mc_flags = 0;
setcontext((const ucontext_t *)ucp->uc_link);
abort();
}
}
