/usr/src/blcr-0.8.5/vmadump4/vmadump_alpha.c is in blcr-dkms 0.8.5-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* vmadump_alpha.c: alpha specific dumping/undumping routines
*
* Copyright (C) 1999-2001 by Erik Hendriks <erik@hendriks.cx>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* $Id: vmadump_alpha.c,v 1.6.16.1 2010/08/12 21:58:35 phargrov Exp $
*-----------------------------------------------------------------------*/
#define __NO_VERSION__
#ifdef CR_NEED_AUTOCONF_H
#include <linux/autoconf.h>
#endif
#if defined(CONFIG_SMP) && ! defined(__SMP__)
#define __SMP__
#endif
#if defined(CONFIG_MODVERSIONS) && ! defined(MODVERSIONS)
#define MODVERSIONS
#endif
#if defined(MODVERSIONS)
#include <linux/modversions.h>
#endif
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#define __VMADUMP_INTERNAL__
#include "vmadump.h"
long vmadump_store_cpu(cr_chkpt_proc_req_t *ctx, struct file *file,
struct pt_regs *regs) {
struct switch_stack *ss;
unsigned long usp;
long bytes = 0, r;
/* Store struct pt_regs */
r = write_kern(ctx, file, regs, sizeof(*regs));
if (r != sizeof(*regs)) goto err;
bytes += r;
/* Alpha has more registers than what's in struct ptregs to save
* The 'switch_stack' structure contains the rest of the integer
* registers and the floating point registers. Then we still have
* to go after the user's stack pointer via the PAL code. */
/* Some pointer voodoo... the switch_stack structure got
* pushed on top of the struct pt_regs.. */
ss = ((struct switch_stack *) regs)-1;
usp = rdusp();
r = write_kern(ctx, file, ss, sizeof(*ss));
if (r != sizeof(*ss)) goto err;
bytes += r;
r = write_kern(ctx, file, &usp, sizeof(usp));
if (r != sizeof(usp)) goto err;
bytes += r;
return bytes;
err:
if (r >= 0) r = -EIO;
return r;
}
int vmadump_restore_cpu(cr_rstrt_proc_req_t *ctx, struct file *file,
struct pt_regs *regs) {
struct pt_regs regtmp;
struct switch_stack *ss, sstmp;
unsigned long usp;
int r;
r = read_kern(ctx, file, ®tmp, sizeof(regtmp));
if (r != sizeof(regtmp)) goto bad_read;
/* Read extra reg info for alpha */
ss = ((struct switch_stack *)regs)-1;
r = read_kern(ctx, file, &sstmp, sizeof(sstmp));
if (r != sizeof(sstmp)) goto bad_read;
r = read_kern(ctx, file, &usp, sizeof(usp));
if (r != sizeof(usp)) goto bad_read;
/* These are the tid-bits we don't want to restore */
regtmp.ps = 8; /* Processor status 8 = user space */
regtmp.hae = regs->hae; /* XXX What is this reg? */
sstmp.r26 = ss->r26; /* Not actually the user r26(ra). That
* one is in struct pt_regs. */
/* Ok, do restore */
memcpy(regs, ®tmp, sizeof(regtmp));
memcpy(ss, &sstmp, sizeof(sstmp)); /* Restores FP regs + saved regs */
wrusp(usp);
return 0;
bad_read:
if (r >= 0) r = -EIO;
return r;
}
#define SWITCH_STACK_SIZE "320"
/* do_switch_stack/undo_switch_stack stolen from arch/alpha/kernel/entry.S */
asm(
".align 3 \n"
".ent save_switch_stack \n"
"save_switch_stack: \n"
" lda $30,-"SWITCH_STACK_SIZE"($30) \n"
" stq $9,0($30) \n"
" stq $10,8($30) \n"
" stq $11,16($30) \n"
" stq $12,24($30) \n"
" stq $13,32($30) \n"
" stq $14,40($30) \n"
" stq $15,48($30) \n"
" stq $26,56($30) \n"
" stt $f0,64($30) \n"
" stt $f1,72($30) \n"
" stt $f2,80($30) \n"
" stt $f3,88($30) \n"
" stt $f4,96($30) \n"
" stt $f5,104($30) \n"
" stt $f6,112($30) \n"
" stt $f7,120($30) \n"
" stt $f8,128($30) \n"
" stt $f9,136($30) \n"
" stt $f10,144($30) \n"
" stt $f11,152($30) \n"
" stt $f12,160($30) \n"
" stt $f13,168($30) \n"
" stt $f14,176($30) \n"
" stt $f15,184($30) \n"
" stt $f16,192($30) \n"
" stt $f17,200($30) \n"
" stt $f18,208($30) \n"
" stt $f19,216($30) \n"
" stt $f20,224($30) \n"
" stt $f21,232($30) \n"
" stt $f22,240($30) \n"
" stt $f23,248($30) \n"
" stt $f24,256($30) \n"
" stt $f25,264($30) \n"
" stt $f26,272($30) \n"
" stt $f27,280($30) \n"
" mf_fpcr $f0 \n"
" stt $f28,288($30) \n"
" stt $f29,296($30) \n"
" stt $f30,304($30) \n"
" stt $f0,312($30) \n"
" ldt $f0,64($30) \n"
" ret $31,($1),1 \n"
".end save_switch_stack \n"
"\n"
".align 3 \n"
".ent restore_switch_stack \n"
"restore_switch_stack: \n"
" ldq $9,0($30) \n"
" ldq $10,8($30) \n"
" ldq $11,16($30) \n"
" ldq $12,24($30) \n"
" ldq $13,32($30) \n"
" ldq $14,40($30) \n"
" ldq $15,48($30) \n"
" ldq $26,56($30) \n"
" ldt $f30,312($30) # get saved fpcr \n"
" ldt $f0,64($30) \n"
" ldt $f1,72($30) \n"
" ldt $f2,80($30) \n"
" ldt $f3,88($30) \n"
" mt_fpcr $f30 # install saved fpcr \n"
" ldt $f4,96($30) \n"
" ldt $f5,104($30) \n"
" ldt $f6,112($30) \n"
" ldt $f7,120($30) \n"
" ldt $f8,128($30) \n"
" ldt $f9,136($30) \n"
" ldt $f10,144($30) \n"
" ldt $f11,152($30) \n"
" ldt $f12,160($30) \n"
" ldt $f13,168($30) \n"
" ldt $f14,176($30) \n"
" ldt $f15,184($30) \n"
" ldt $f16,192($30) \n"
" ldt $f17,200($30) \n"
" ldt $f18,208($30) \n"
" ldt $f19,216($30) \n"
" ldt $f20,224($30) \n"
" ldt $f21,232($30) \n"
" ldt $f22,240($30) \n"
" ldt $f23,248($30) \n"
" ldt $f24,256($30) \n"
" ldt $f25,264($30) \n"
" ldt $f26,272($30) \n"
" ldt $f27,280($30) \n"
" ldt $f28,288($30) \n"
" ldt $f29,296($30) \n"
" ldt $f30,304($30) \n"
" lda $30,"SWITCH_STACK_SIZE"($30) \n"
" ret $31,($1),1 \n"
".end restore_switch_stack \n"
" \n"
".align 3 \n"
".globl sys_vmadump \n"
".ent sys_vmadump \n"
"sys_vmadump: \n"
" ldgp $29,0($27) \n"
" bsr $1,save_switch_stack \n"
" lda $16,"SWITCH_STACK_SIZE"($30) \n"
" jsr $26,do_vmadump \n"
" bsr $1,restore_switch_stack \n"
" ret $31,($26),1 \n"
".end sys_vmadump \n"
);
/*
* Local variables:
* c-basic-offset: 4
* End:
*/
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