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/* $NetBSD: makecontext.c,v 1.4 2003/01/22 13:44:36 scw Exp $ */
/*
* Copyright 2003 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Steve C. Woodford for Wasabi Systems, Inc.
*
* 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 for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
* 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>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: makecontext.c,v 1.4 2003/01/22 13:44:36 scw Exp $");
#endif
#include <sys/types.h>
#include <inttypes.h>
#include <ucontext.h>
#include "extern.h"
#include <stdarg.h>
#include <sh5/fpu.h>
void
makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
{
__greg_t *gr = ucp->uc_mcontext.__gregs;
register_t *sp;
register_t r;
va_list ap;
int i;
sp = (register_t *)
(((intptr_t)ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size) & ~7);
if (argc > 8)
sp -= (argc - 8);
gr[_REG_PC] = (__greg_t)(intptr_t)func;
gr[_REG_R(18)] = (__greg_t)(intptr_t)_resumecontext;
gr[_REG_SP] = (__greg_t)(intptr_t)sp;
gr[_REG_FP] = 0;
gr[_REG_USR] = 0x000f; /* r0-r31 are dirty */
/*
* The new context inherits the global variable/constant pointers
* in r26 and r27.
*
* XXXSCW: I've never actually seen these used anywhere, so this
* may well be unnecessary...
*/
__asm __volatile("or r26, r63, %0" : "=r"(r));
gr[_REG_R(26)] = r;
__asm __volatile("or r27, r63, %0" : "=r"(r));
gr[_REG_R(27)] = r;
/*
* Ensure the branch target registers contain sane values
* or else the kernel will refuse to restore the context.
*/
gr[_REG_TR(0)] = 0;
gr[_REG_TR(1)] = 0;
gr[_REG_TR(2)] = 0;
gr[_REG_TR(3)] = 0;
gr[_REG_TR(4)] = 0;
gr[_REG_TR(5)] = 0;
gr[_REG_TR(6)] = 0;
gr[_REG_TR(7)] = 0;
/*
* Ensure the FPSCR is valid
*/
ucp->uc_mcontext.__fpregs.__fp_scr = SH5_FPSCR_DN_FLUSH_ZERO;
va_start(ap, argc);
/*
* First 8 args are passed in r2-r9
*/
for (i = 0; i < argc && i < 8; i++)
gr[_REG_R(i + 2)] = (register_t)va_arg(ap, long);
/*
* Additional args are passed on the stack as 64-bit quantities
*/
for (argc -= i; argc > 0; argc--)
*sp++ = (register_t)va_arg(ap, long);
va_end(ap);
}
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