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