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/* $OpenBSD: uthread_machdep.c,v 1.2 2003/05/27 22:59:33 miod Exp $ */
/*
* Machine-dependent thread state functions for OpenBSD/vax
* Written by Miodrag Vallat <miod@openbsd.org> - placed in the public domain.
*/
#include <pthread.h>
#include "pthread_private.h"
/* XXX we need <machine/asm.h> but it conflicts with <machine/cdefs.h> */
#undef _C_LABEL
#undef WEAK_ALIAS
#include <machine/asm.h>
#define ALIGNBYTES 3
struct frame {
/* a CALLS frame */
long condition; /* sp and fp point here */
long psw;
long ap; /* r12 */
long fp; /* r13 */
long pc; /* r15 */
long r[10]; /* r2 - r11 */
long numarg; /* ap points here */
};
/*
* Given a stack and an entry function, initialize a state
* structure that can be later switched to.
*/
void
_thread_machdep_init(struct _machdep_state* statep, void *base, int len,
void (*entry)(void))
{
struct frame *f;
/* Locate the initial frame, aligned at the top of the stack */
f = (struct frame *)(((long)base + len - sizeof *f) & ~ALIGNBYTES);
/* Set up initial frame */
f->condition = 0;
f->psw = (1 << 29) /* CALLS */ |
((R2|R3|R4|R5|R6|R7|R8|R9|R10|R11) << 16);
f->ap = (long)&f->numarg;
f->fp = (long)f;
/*
* DANGER WILL ROBINSON! The thread entry point is a CALLS target
* routine, hence it starts with two bytes being the entry
* mask. We rely here upon the following facts:
* - MI code will always pass _thread_start as the entry argument
* - the entry mask for _thread_start is zero (no registers saved)
*/
f->pc = (long)entry + 2; /* skip entry mask */
f->numarg = 0; /* safety */
statep->frame = f->fp;
}
void
_thread_machdep_save_float_state(struct _machdep_state* statep)
{
/* nothing to do */
}
void
_thread_machdep_restore_float_state(struct _machdep_state* statep)
{
/* nothing to do */
}
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