/usr/src/blcr-0.8.2/vmadump4/vmadump_arm.c is in blcr-dkms 0.8.2-15ubuntu2.
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* vmadump_arm: ARM 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_arm.c,v 1.8 2008/06/04 22:19:15 phargrov Exp $
*
* Experimental ARM support contributed by Anton V. Uzunov
* <anton.uzunov@dsto.defence.gov.au> of the Australian Government
* Department of Defence, Defence Science and Technology Organisation.
*
* ARM-specific questions should be directed to blcr-arm@hpcrd.lbl.gov.
*
* THIS FILE IS SPECIFIC TO BLCR <http://ftg.lbl.gov/checkpoint>
*-----------------------------------------------------------------------*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#define __VMADUMP_INTERNAL__
#include "vmadump.h"
#ifdef VMAD_DEBUG_FLAG
#define VMAD_DEBUG(arg...) CR_KTRACE_DEBUG( arg )
#else
#define VMAD_DEBUG(arg...)
#endif
long vmadump_store_cpu(cr_chkpt_proc_req_t *ctx, struct file *file,
struct pt_regs *regs)
{
long bytes = 0;
long r;
int i;
#if HAVE_THREAD_INFO_TP_VALUE
struct thread_info *thread = current_thread_info();
#endif
struct task_struct *tsk = current;
struct thread_struct *thread_fault_info = &tsk->thread;
// Store struct pt_regs
r = write_kern(ctx, file, regs, sizeof(*regs));
if (r != sizeof(*regs)) goto err;
bytes += r;
// debug trace
for (i = 0; i < 17; i++) {
VMAD_DEBUG( "vmadump module: regs[ %d ] == %ld", i, regs->uregs[ i ] );
}
// Store thread's fault info
r = write_kern(ctx, file, &thread_fault_info->address,
sizeof(thread_fault_info->address));
if (r != sizeof(thread_fault_info->address)) goto err;
bytes += r;
VMAD_DEBUG( "vmadump: thread_fault_info->address == %ld",
thread_fault_info->address );
r = write_kern(ctx, file, &thread_fault_info->trap_no,
sizeof(thread_fault_info->trap_no));
if (r != sizeof(thread_fault_info->trap_no)) goto err;
bytes += r;
VMAD_DEBUG( "vmadump: thread_fault_info->trap_no == %ld",
thread_fault_info->trap_no );
r = write_kern(ctx, file, &thread_fault_info->error_code,
sizeof(thread_fault_info->error_code));
if (r != sizeof(thread_fault_info->error_code)) goto err;
bytes += r;
VMAD_DEBUG( "vmadump: thread_fault_info->error_code == %ld",
thread_fault_info->error_code );
#if HAVE_THREAD_INFO_TP_VALUE
// Store thread-specific pointer
r = write_kern(ctx, file, &thread->tp_value,
sizeof(thread->tp_value));
if (r != sizeof(thread->tp_value)) goto err;
bytes += r;
VMAD_DEBUG( "vmadump: thread->tp_value == %ld",
thread->tp_value );
#endif
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 thread_info *thread = current_thread_info();
struct pt_regs regtmp;
int r;
int i;
// read in pt_regs struct and make sure the regs are somewhat valid
r = read_kern(ctx, file, ®tmp, sizeof(regtmp));
if (r != sizeof(regtmp) || !valid_user_regs(®tmp))
goto bad_read;
// restore CPU registers
memcpy(regs, ®tmp, sizeof(regtmp));
// debug trace
for (i = 0; i < 17; i++) {
VMAD_DEBUG( "vmadump module: regs[ %d ] == %ld", i, regs->uregs[ i ] );
}
// restore thread fault info
r = read_kern(ctx, file, ¤t->thread.address,
sizeof(current->thread.address));
if (r != sizeof(current->thread.address)) goto bad_read;
VMAD_DEBUG( "vmadump: current->thread.address == %ld",
current->thread.address );
r = read_kern(ctx, file, ¤t->thread.trap_no,
sizeof(current->thread.trap_no));
if (r != sizeof(current->thread.trap_no)) goto bad_read;
VMAD_DEBUG( "vmadump: current->thread.trap_no == %ld",
current->thread.trap_no );
r = read_kern(ctx, file, ¤t->thread.error_code,
sizeof(current->thread.error_code));
if (r != sizeof(current->thread.error_code)) goto bad_read;
VMAD_DEBUG( "vmadump: current->thread.error_code == %ld",
current->thread.error_code );
#if HAVE_THREAD_INFO_TP_VALUE
// retore thread-specific pointer
r = read_kern(ctx, file, &thread->tp_value,
sizeof(thread->tp_value));
if (r != sizeof(thread->tp_value)) goto bad_read;
VMAD_DEBUG( "vmadump: thread->tp_value == %ld",
thread->tp_value );
#if defined(CONFIG_HAS_TLS_REG)
asm ("mcr p15, 0, %0, c13, c0, 3" : : "r" (thread->tp_value) );
#elif !defined(CONFIG_TLS_REG_EMUL)
#if defined(CR_KCODE___kuser_helper_start) /* NPTL support code in 2.6.12 and later */
*((unsigned int *)0xffff0ff0) = (thread->tp_value);
#else
// The 2.6.11 kernel did this differently.
*((unsigned int *)0xffff0ffc) = (thread->tp_value);
#endif
#endif
#endif
return( 0 );
bad_read:
if (r >= 0) r = -EIO;
return( r );
}
/*
* Local variables:
* c-basic-offset: 2
* End:
*/
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