e415d48872
Bumping libc files for unsupported architectures, to simplify merging. A bunch of small fixes: * in libutil update * the macro in endian.h * some undefined types due to clear separation from host. * Fix a warning for cdbr.c Some modification which were required for the new build system: * inclusion path for const.h in sconst, still hacky * Removed default malloc.c which conflicts on some occasions.
95 lines
3.4 KiB
C
95 lines
3.4 KiB
C
/* $NetBSD: makecontext.c,v 1.7 2011/09/20 08:42:29 joerg Exp $ */
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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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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: makecontext.c,v 1.7 2011/09/20 08:42:29 joerg Exp $");
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#endif
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#include <inttypes.h>
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#include <stddef.h>
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#include <ucontext.h>
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#include "extern.h"
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#include <stdarg.h>
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void __resumecontext(void) __dead;
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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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__greg_t *sp;
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int i;
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va_list ap;
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/* LINTED uintptr_t is safe */
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sp = (__greg_t *)
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((uintptr_t)ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size);
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/* LINTED uintptr_t is safe */
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#if defined(__mips_o32) || defined(__mips_o64)
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sp -= (argc >= 4 ? argc : 4); /* Make room for >=4 arguments. */
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sp = (__greg_t *)
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((uintptr_t)sp & ~0x7); /* Align on double-word boundary. */
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#elif defined(__mips_n32) || defined(__mips_n64)
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sp -= (argc > 8 ? argc - 8 : 0); /* Make room for > 8 arguments. */
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sp = (__greg_t *)
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((uintptr_t)sp & ~0xf); /* Align on quad-word boundary. */
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#endif
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gr[_REG_SP] = (intptr_t)sp;
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gr[_REG_RA] = (intptr_t)__resumecontext;
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gr[_REG_T9] = (intptr_t)func; /* required for .abicalls */
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gr[_REG_EPC] = (intptr_t)func;
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/* Construct argument list. */
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va_start(ap, argc);
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#if defined(__mips_o32) || defined(__mips_o64)
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/* Up to the first four arguments are passed in $a0-3. */
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for (i = 0; i < argc && i < 4; i++)
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/* LINTED __greg_t is safe */
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gr[_REG_A0 + i] = va_arg(ap, __greg_t);
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/* Pass remaining arguments on the stack above the $a0-3 gap. */
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sp += i;
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#endif
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#if defined(__mips_n32) || defined(__mips_n64)
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/* Up to the first 8 arguments are passed in $a0-7. */
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for (i = 0; i < argc && i < 8; i++)
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/* LINTED __greg_t is safe */
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gr[_REG_A0 + i] = va_arg(ap, __greg_t);
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/* Pass remaining arguments on the stack above the $a0-3 gap. */
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#endif
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/* Pass remaining arguments on the stack above the $a0-3 gap. */
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for (; i < argc; i++)
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/* LINTED uintptr_t is safe */
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*sp++ = va_arg(ap, __greg_t);
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va_end(ap);
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}
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