d915a14ef0
Mainly focus on files that use BSD 2-Clause license, however the tool I was using mis-identified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
/* $NetBSD: makecontext.c,v 1.2 2003/01/18 11:06:24 thorpej Exp $ */
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/*-
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* SPDX-License-Identifier: BSD-2-Clause-NetBSD
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*
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* Copyright (c) 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Klaus Klein.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF 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 <stdlib.h>
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#include <stddef.h>
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#include <inttypes.h>
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#include <ucontext.h>
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#include <stdarg.h>
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extern 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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__greg_t *gr = ucp->uc_mcontext.__gregs;
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int i;
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unsigned int *sp;
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va_list ap;
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/* Compute and align stack pointer. */
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sp = (unsigned int *)
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(((uintptr_t)ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size -
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sizeof(double)) & ~7);
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/* Allocate necessary stack space for arguments exceeding r0-3. */
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if (argc > 4)
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sp -= argc - 4;
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gr[_REG_SP] = (__greg_t)sp;
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/* Wipe out frame pointer. */
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gr[_REG_FP] = 0;
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/* Arrange for return via the trampoline code. */
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gr[_REG_PC] = (__greg_t)_ctx_start;
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gr[_REG_R4] = (__greg_t)func;
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gr[_REG_R5] = (__greg_t)ucp;
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va_start(ap, argc);
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/* Pass up to four arguments in r0-3. */
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for (i = 0; i < argc && i < 4; i++)
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gr[_REG_R0 + i] = va_arg(ap, int);
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/* Pass any additional arguments on the stack. */
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for (argc -= i; argc > 0; argc--)
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*sp++ = va_arg(ap, int);
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va_end(ap);
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}
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