[PATCH 0/2] kexec-tools: ARM kernel crashdump support
Mika Westerberg
ext-mika.1.westerberg at nokia.com
Mon Apr 26 05:03:29 EDT 2010
Hello,
These patches bring ARM kernel crashdump support for kexec-tools. They need
kernel support which was posted on LAKML while ago[1]. I should've sent them
both at the same time so that people actually could try them but apparently I
didn't. Sorry about that. I can sent the whole series again if preferred.
Only zImage format is currently supported.
In addition, I have modified sample gdb macros from
kernel/Documentation/kdump/gdbmacrox.txt to work with ARM crashdumps. They are
included in the end of this email in case someone finds them useful.
I have been testing these on my N900.
Thanks,
MW
[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2010-April/013245.html
Mika Westerberg (2):
kexec: add phys_offset field
kexec: implement ARM crashdump support
kexec/arch/arm/Makefile | 1 +
kexec/arch/arm/crashdump-arm.c | 318 +++++++++++++++++++++++++++++++++++++
kexec/arch/arm/crashdump-arm.h | 19 +++
kexec/arch/arm/kexec-arm.c | 5 -
kexec/arch/arm/kexec-zImage-arm.c | 47 +++++-
kexec/crashdump-elf.c | 9 +-
kexec/crashdump.h | 1 +
7 files changed, 392 insertions(+), 8 deletions(-)
create mode 100644 kexec/arch/arm/crashdump-arm.c
create mode 100644 kexec/arch/arm/crashdump-arm.h
------------------------- ~/.gdbinit -------------------------
#
# Useful gdb macros for ARM kdumps. Derived from macros
# in Documentation/kdump/gdbmacros.txt.
#
# Credits:
# Alexander Nyberg <alexn at telia.com>
# V Srivatsa <vatsa at in.ibm.com>
# Maneesh Soni <maneesh at in.ibm.com>
# Mika Westerberg <ext-mika.1.westerberg at nokia.com>
#
define arch_current_thread_info
set $current_thread_info = \
(struct thread_info *)((unsigned long)$sp & ~(8192-1))
end
define current
arch_current_thread_info
set $current = $current_thread_info->task
end
define ps
set $tasks_off=((size_t)&((struct task_struct *)0)->tasks)
set $init_t=&init_task
set $next_t=(((char *)($init_t->tasks).next) - $tasks_off)
# get current task
current
printf "PID COMMAND TASK\n"
while ($next_t != $init_t)
set $next_t=(struct task_struct *)$next_t
printf "%-10d %-20s 0x%x", $next_t->pid, $next_t->comm, $next_t
if ($next_t == $current)
printf "*\n"
else
printf "\n"
end
set $next_t=(char *)($next_t->tasks.next) - $tasks_off
end
end
define dmesg
set $i = 0
set $end_idx = (log_end - 1) & (log_buf_len - 1)
while ($i < logged_chars)
set $idx = (log_end - 1 - logged_chars + $i) & (log_buf_len - 1)
if ($idx + 100 <= $end_idx) || \
($end_idx <= $idx && $idx + 100 < log_buf_len)
printf "%.100s", &log_buf[$idx]
set $i = $i + 100
else
printf "%c", log_buf[$idx]
set $i = $i + 1
end
end
end
document dmesg
print the kernel ring buffer
end
define lsfs
set $fs = file_systems
while ($fs != 0)
printf "%-20s %p\n", $fs->name, $fs
set $fs = $fs->next
end
end
document lsfs
prints registered filesystems
end
define print_mount_path
if ($arg0 != $arg1->d_parent)
print_mount_path $arg0->d_parent $arg1
end
if ($arg0->d_name.name[0] != '/')
printf "/%s", $arg0->d_name.name
end
end
define print_mount
if ($arg0 != $arg1)
print_mount $arg0->mnt_parent $arg1
end
print_mount_path $arg0->mnt_mountpoint $arg0->mnt_mountpoint->d_parent
end
define mounts
current
set $vfsmount_off=((size_t)&((struct vfsmount *)0)->mnt_list)
set $root = $current->nsproxy->mnt_ns->root
set $r_prev = $root->mnt_list.prev
set $r_next = $root->mnt_list.next
set $mnt=(struct vfsmount *)((char *)($r_next) - $vfsmount_off)
while ($r_next != $r_prev)
printf "%-20s %p %-10s ", $mnt->mnt_devname, $mnt, $mnt->mnt_sb->s_id
if ($mnt->mnt_parent == $root)
printf "/"
else
print_mount $mnt $root
end
printf "\n"
set $r_next = $mnt->mnt_list.next
set $mnt=(struct vfsmount *)((char *)($r_next) - $vfsmount_off)
end
end
document mounts
prints out all mounts
end
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