diff options
Diffstat (limited to 'lib/libc/mips/gen/makecontext.c')
| -rw-r--r-- | lib/libc/mips/gen/makecontext.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/lib/libc/mips/gen/makecontext.c b/lib/libc/mips/gen/makecontext.c new file mode 100644 index 0000000..01d88bf --- /dev/null +++ b/lib/libc/mips/gen/makecontext.c @@ -0,0 +1,86 @@ +/* $NetBSD: makecontext.c,v 1.3 2003/01/19 08:53:36 matt Exp $ */ + +/*- + * Copyright (c) 2001 The NetBSD Foundation, Inc. + * All rights reserved. + * + * This code is derived from software contributed to The NetBSD Foundation + * by Klaus Klein. + * + * 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. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the NetBSD + * Foundation, Inc. and its contributors. + * 4. Neither the name of The NetBSD Foundation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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("$FreeBSD$"); +#if defined(LIBC_SCCS) && !defined(lint) +__RCSID("$NetBSD: makecontext.c,v 1.3 2003/01/19 08:53:36 matt Exp $"); +#endif + +#include <sys/types.h> +#include <ucontext.h> +#include <stdarg.h> + +void +makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...) +{ + /* XXXMIPS: Implement me */ +#if 0 + __greg_t *gr = ucp->uc_mcontext.__gregs; + uintptr_t *sp; + int i; + va_list ap; + + void __resumecontext(void); + + /* LINTED uintptr_t is safe */ + sp = (uintptr_t *) + ((uintptr_t)ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size); + /* LINTED uintptr_t is safe */ + sp -= (argc >= 4 ? argc : 4); /* Make room for >=4 arguments. */ + sp = (uintptr_t *) + ((uintptr_t)sp & ~0x7); /* Align on double-word boundary. */ + + gr[_REG_SP] = (__greg_t)sp; + gr[_REG_RA] = (__greg_t)__resumecontext; + gr[_REG_T9] = (__greg_t)func; /* required for .abicalls */ + gr[_REG_EPC] = (__greg_t)func; + + /* Construct argument list. */ + va_start(ap, argc); + /* Up to the first four arguments are passed in $a0-3. */ + for (i = 0; i < argc && i < 4; i++) + /* LINTED uintptr_t is safe */ + gr[_REG_A0 + i] = va_arg(ap, uintptr_t); + /* Pass remaining arguments on the stack above the $a0-3 gap. */ + for (sp += 4; i < argc; i++) + /* LINTED uintptr_t is safe */ + *sp++ = va_arg(ap, uintptr_t); + va_end(ap); +#endif +} |
