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/* $OpenBSD: uthread_machdep.c,v 1.2 2007/03/02 06:11:54 miod Exp $ */
/*
* Copyright (c) 2007 Miodrag Vallat.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice, this permission notice, and the disclaimer below
* appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <pthread.h>
#include "pthread_private.h"
#define STACK_ALIGNMENT 4
struct regframe {
/* return address */
register_t pr;
/* call-saved general registers */
register_t r14;
register_t r13;
register_t r12;
register_t r11;
register_t r10;
register_t r9;
register_t r8;
register_t macl;
register_t mach;
#if defined(__SH4__) && !defined(__SH4_NOFPU__)
/* call-saved floating point registers */
register_t fr12;
register_t fr13;
register_t fr14;
register_t fr15;
register_t xd12;
register_t xd13;
register_t xd14;
register_t xd15;
/* floating point control registers */
register_t fpul;
register_t fpscr;
#endif
};
void
_thread_machdep_init(struct _machdep_state* statep, void *base, int len,
void (*entry)(void))
{
struct regframe *regs;
regs = (struct regframe *)
(((u_int32_t)base + len - sizeof *regs) & ~(STACK_ALIGNMENT - 1));
regs->pr = (register_t)entry;
#if defined(__SH4__) && !defined(__SH4_NOFPU__)
__asm__ __volatile__ ("sts fpscr, %0" : "=r" (regs->fpscr));
#endif
statep->sp = (u_int)regs;
}
/*
* Floating point state is saved with the general registers in
* _thread_machdep_switch().
*/
void
_thread_machdep_save_float_state(struct _machdep_state* statep)
{
}
void
_thread_machdep_restore_float_state(struct _machdep_state* statep)
{
}
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