0bfee92849
Reviewed by: andrew, emaste, kib Sponsored by: DARPA, AFRL Sponsored by: HEIF5 Differential Revision: https://reviews.freebsd.org/D4943
92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
/*-
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* Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
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* All rights reserved.
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*
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* Portions of this software were developed by SRI International and the
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* University of Cambridge Computer Laboratory under DARPA/AFRL contract
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* FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
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*
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* Portions of this software were developed by the University of Cambridge
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* Computer Laboratory as part of the CTSRD Project, with support from the
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* UK Higher Education Innovation Fund (HEIF).
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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 <machine/riscvreg.h>
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#include <inttypes.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <ucontext.h>
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void _ctx_start(void);
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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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setcontext((const ucontext_t *)ucp->uc_link);
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abort();
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}
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}
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__weak_reference(__makecontext, makecontext);
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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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struct gpregs *gp;
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va_list ap;
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int i;
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/* A valid context is required. */
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if (ucp == NULL)
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return;
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if ((argc < 0) || (argc > 8))
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return;
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gp = &ucp->uc_mcontext.mc_gpregs;
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va_start(ap, argc);
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/* Pass up to eight arguments in a0-7. */
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for (i = 0; i < argc && i < 8; i++)
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gp->gp_a[i] = va_arg(ap, uint64_t);
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va_end(ap);
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/* Set the stack */
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gp->gp_sp = STACKALIGN(ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size);
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/* Arrange for return via the trampoline code. */
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gp->gp_sepc = (__register_t)_ctx_start;
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gp->gp_s[0] = (__register_t)func;
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gp->gp_s[1] = (__register_t)ucp;
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}
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