154 lines
4.7 KiB
C
154 lines
4.7 KiB
C
/* $NetBSD: kgdb_glue.c,v 1.1 1996/05/05 12:17:25 oki Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This software was developed by the Computer Systems Engineering group
|
|
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
|
|
* contributed to Berkeley.
|
|
*
|
|
* All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Lawrence Berkeley Laboratories.
|
|
*
|
|
* 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 University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
|
|
*
|
|
* @(#)kgdb_glue.c 8.2 (Berkeley) 1/12/94
|
|
*/
|
|
|
|
/*
|
|
* This file must be compiled with gcc -fno-defer-pop.
|
|
*/
|
|
|
|
#ifdef KGDB
|
|
|
|
#include <sys/param.h>
|
|
|
|
#include <machine/frame.h>
|
|
#include <machine/reg.h>
|
|
|
|
#ifndef lint
|
|
static char rcsid[] = "$NetBSD: kgdb_glue.c,v 1.1 1996/05/05 12:17:25 oki Exp $";
|
|
#endif
|
|
|
|
#define KGDB_STACKSIZE 0x800
|
|
#define KGDB_STACKWORDS (KGDB_STACKSIZE / sizeof(u_long))
|
|
|
|
u_long kgdb_stack[KGDB_STACKWORDS];
|
|
|
|
#define getsp(v) asm("movl sp, %0" : "=r" (v))
|
|
#define setsp(v) asm("movl %0, sp" :: "r" (v))
|
|
|
|
static inline void
|
|
copywords(src, dst, nbytes)
|
|
register u_long *src, *dst;
|
|
register u_int nbytes;
|
|
{
|
|
u_long *limit = src + (nbytes / sizeof(u_long));
|
|
|
|
do {
|
|
*dst++ = *src++;
|
|
} while (src < limit);
|
|
if (nbytes & 2)
|
|
*(u_short *)dst = *(u_short *)src;
|
|
}
|
|
|
|
kgdb_trap_glue(type, frame)
|
|
int type;
|
|
struct frame frame;
|
|
{
|
|
u_long osp, nsp;
|
|
u_int fsize, s;
|
|
extern short exframesize[];
|
|
|
|
/*
|
|
* After a kernel mode trap, the saved sp doesn't point to the right
|
|
* place. The correct value is the top of the frame (i.e. before the
|
|
* KGDB trap).
|
|
*
|
|
* XXX this may have to change if we implement an interrupt stack.
|
|
*/
|
|
fsize = sizeof(frame) - sizeof(frame.F_u) + exframesize[frame.f_format];
|
|
frame.f_regs[SP] = (u_long)&frame + fsize;
|
|
|
|
/*
|
|
* Copy the interrupt context and frame to the new stack.
|
|
* We're throwing away trap()'s frame since we're going to do
|
|
* our own rte.
|
|
*/
|
|
nsp = (u_long)&kgdb_stack[KGDB_STACKWORDS] -
|
|
roundup(fsize, sizeof(u_long));
|
|
|
|
copywords((u_long *)&frame, (u_long *)nsp, fsize);
|
|
|
|
s = splhigh();
|
|
|
|
getsp(osp);
|
|
setsp(nsp);
|
|
|
|
if (kgdb_trap(type, (struct frame *)nsp) == 0) {
|
|
/*
|
|
* Get back on kernel stack. This thread of control
|
|
* will return back up through trap(). If kgdb_trap()
|
|
* returns 0, it didn't handle the trap at all so
|
|
* the stack is still intact and everything will
|
|
* unwind okay from here up.
|
|
*/
|
|
setsp(osp);
|
|
splx(s);
|
|
return 0;
|
|
}
|
|
/*
|
|
* Copy back context, which has possibly changed. Even the
|
|
* sp might have changed.
|
|
*/
|
|
osp = ((struct frame *)nsp)->f_regs[SP] - fsize;
|
|
copywords((u_long *)nsp, (u_long *)osp, fsize);
|
|
setsp(osp);
|
|
|
|
/*
|
|
* Restore the possible new context from frame, pop the
|
|
* unneeded usp (we trapped from kernel mode) and pad word,
|
|
* and return to the trapped thread.
|
|
*/
|
|
asm("moveml sp@+,#0x7FFF; addql #8,sp; rte");
|
|
}
|
|
|
|
int kgdb_testval;
|
|
|
|
kgdb_test(i)
|
|
int i;
|
|
{
|
|
++kgdb_testval;
|
|
return (i + 1);
|
|
}
|
|
#endif /* KGDB */
|