100 lines
3.2 KiB
C
100 lines
3.2 KiB
C
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/* $NetBSD: makecontext.c,v 1.3 2008/04/28 20:22:56 martin 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 1.3 2008/04/28 20:22:56 martin 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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#include <sys/types.h>
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#include <machine/frame.h>
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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 *gp, rp, fp;
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register __greg_t dp __asm("r27");
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uintptr_t *sp;
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int i;
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va_list ap;
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void __resumecontext(void);
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/* LINTED uintptr_t is safe */
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sp = (uintptr_t *)ucp->uc_stack.ss_sp;
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/* LINTED uintptr_t is safe */
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sp += 16; /* standard frame */
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sp += (argc >= 4 ? argc : 4); /* Make room for >=4 arguments. */
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sp = (uintptr_t *)
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((uintptr_t)(sp + 16) & ~0x3f); /* Align on 64-byte boundary. */
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/* Save away the registers that we'll need. */
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gr[_REG_SP] = (__greg_t)sp;
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rp = (__greg_t)__resumecontext;
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if (rp & 2) {
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gp = (__greg_t *)(rp & ~3);
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rp = gp[0];
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sp[-8] = gp[1];
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}
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gr[_REG_RP] = rp;
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fp = (__greg_t)func;
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if (fp & 2) {
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gp = (__greg_t *)(fp & ~3);
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fp = gp[0];
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gr[_REG_R19] = gp[1];
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}
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gr[_REG_PCOQH] = fp | HPPA_PC_PRIV_USER;
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gr[_REG_PCOQT] = (fp + 4) | HPPA_PC_PRIV_USER;
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gr[_REG_DP] = dp;
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/* Construct argument list. */
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va_start(ap, argc);
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/* Up to the first four arguments are passed in %arg0-3. */
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for (i = 0; i < argc && i < 4; i++) {
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/* LINTED uintptr_t is safe */
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gr[_REG_ARG0 - i] = va_arg(ap, uintptr_t);
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}
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/* Pass remaining arguments on the stack below the %arg0-3 gap. */
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for (; i < argc; i++) {
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/* LINTED uintptr_t is safe */
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sp[-9 - i] = va_arg(ap, uintptr_t);
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}
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va_end(ap);
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}
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