/usr/src/blcr-0.8.2/vmadump4/vmadump_ppc.c is in blcr-dkms 0.8.2-15ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 | /*-------------------------------------------------------------------------
* vmadump_powerpc.c: powerpc 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_ppc.c,v 1.10 2008/08/02 02:19:05 phargrov Exp $
*
* THIS VERSION MODIFIED FOR BLCR <http://ftg.lbl.gov/checkpoint>
*-----------------------------------------------------------------------*/
#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) {
long bytes = 0, r;
/* Store struct pt_regs */
r = write_kern(ctx, file, regs, sizeof(*regs));
if (r != sizeof(*regs)) goto err;
bytes += r;
/* Floating point regs */
if (regs->msr & MSR_FP)
giveup_fpu(current);
r = write_kern(ctx, file, ¤t->thread.fpr,
sizeof(current->thread.fpr));
if (r != sizeof(current->thread.fpr)) goto err;
bytes += r;
r = write_kern(ctx, file, ¤t->thread.fpscr,
sizeof(current->thread.fpscr));
if (r != sizeof(current->thread.fpscr)) goto err;
bytes += r;
#if HAVE_THREAD_VDSO_BASE
/* unconditionally store the base of the VDSO library */
r = write_kern(ctx, file, ¤t->thread.vdso_base,
sizeof(current->thread.vdso_base));
if (r != sizeof(current->thread.vdso_base)) goto err;
bytes += r;
#endif
#ifdef CONFIG_ALTIVEC
/* XXX I really need to find out if this is right */
if (regs->msr & MSR_VEC)
giveup_altivec(current);
r = write_kern(ctx, file, ¤t->thread.vr,
sizeof(current->thread.vr));
if (r != sizeof(current->thread.vr)) goto err;
bytes += r;
r = write_kern(ctx, file, ¤t->thread.vscr,
sizeof(current->thread.vscr));
if (r != sizeof(current->thread.vscr)) goto err;
bytes += r;
#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 pt_regs regtmp;
int r;
r = read_kern(ctx, file, ®tmp, sizeof(regtmp));
if (r != sizeof(regtmp)) goto bad_read;
/* Don't restore machine state register since this is
* unpriviledged user space stuff we're restoring. */
regtmp.msr = MSR_USER; /*regs->msr | MSR_PR;*/
memcpy(regs, ®tmp, sizeof(regtmp));
/* Floating point regs */
r = read_kern(ctx, file, ¤t->thread.fpr,
sizeof(current->thread.fpr));
if (r != sizeof(current->thread.fpr)) goto bad_read;
r = read_kern(ctx, file, ¤t->thread.fpscr,
sizeof(current->thread.fpscr));
if (r != sizeof(current->thread.fpscr)) goto bad_read;
#if HAVE_THREAD_VDSO_BASE
/* unconditonally restore this */
r = read_kern(ctx, file, ¤t->thread.vdso_base,
sizeof(current->thread.vdso_base));
if (r != sizeof(current->thread.vdso_base)) goto bad_read;
#endif
#ifdef CONFIG_ALTIVEC
/* Restore Altivec */
r = read_kern(ctx, file, ¤t->thread.vr,
sizeof(current->thread.vr));
if (r != sizeof(current->thread.vr)) goto bad_read;
r = read_kern(ctx, file, ¤t->thread.vscr,
sizeof(current->thread.vscr));
if (r != sizeof(current->thread.vscr)) goto bad_read;
#endif
current->thread.regs = regs;
return 0;
bad_read:
if (r >= 0) r = -EIO;
return r;
}
#if VMAD_HAVE_ARCH_MAPS
#include <linux/mman.h>
#if HAVE_THREAD_VDSO_BASE
#define vmad_vdso_base current->thread.vdso_base
#elif HAVE_MM_CONTEXT_VDSO_BASE
#define vmad_vdso_base current->mm->context.vdso_base
#else
#error "No support yet for VDSO on your kernel - please report as a BLCR bug"
#endif
int vmad_is_arch_map(const struct vm_area_struct *map)
{
return (map->vm_start == vmad_vdso_base);
}
EXPORT_SYMBOL_GPL(vmad_is_arch_map);
loff_t vmad_store_arch_map(cr_chkpt_proc_req_t *ctx, struct file *file,
struct vm_area_struct *map, int flags)
{
loff_t r = 0;
if (vmad_is_arch_map(map)) {
/* Just write out a section header */
struct vmadump_vma_header head;
head.start = map->vm_start;
head.end = map->vm_end;
head.flags = map->vm_flags;
head.namelen = VMAD_NAMELEN_ARCH;
head.offset = 0;
r = write_kern(ctx, file, &head, sizeof(head));
if (r < 0) return r;
if (r != sizeof(head)) r = -EIO;
}
return r;
}
int vmad_load_arch_map(cr_rstrt_proc_req_t *ctx, struct file *file,
struct vmadump_vma_header *head)
{
long r;
#if HAVE_2_ARG_ARCH_SETUP_ADDITIONAL_PAGES
r = arch_setup_additional_pages(NULL, 0);
#elif HAVE_4_ARG_ARCH_SETUP_ADDITIONAL_PAGES
r = arch_setup_additional_pages(NULL, 0, 0, 0);
#else
#error "Unknown calling convention to map the VDSO"
#endif
if (r < 0) {
CR_ERR_CTX(ctx, "arch_setup_additional_pages failed %d", (int)r);
goto err;
}
/* arch_setup_additional_pages() has overwritten vdso_base w/ the newly allocated one.
* Here we check this new value against against the desired location (in head->start).
*/
if (head->start != vmad_vdso_base) {
long len = head->end - head->start;
unsigned long old_addr = vmad_vdso_base;
unsigned long new_addr = sys_mremap(old_addr, len, len, MREMAP_FIXED|MREMAP_MAYMOVE, head->start);
if (new_addr != head->start) {
r = (new_addr & (PAGE_SIZE-1)) ? new_addr : -ENOMEM;
CR_ERR_CTX(ctx, "vdso remap failed %d", (int)r);
goto err;
}
vmad_vdso_base = new_addr;
}
r = 0;
err:
return r;
}
#endif
/*
* Local variables:
* c-basic-offset: 4
* End:
*/
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