linux/arch/um/kernel
Jeff Dike 3eddddcf23 [PATCH] uml: breakpoint an arbitrary thread
This patch implements a stack trace for a thread, not unlike sysrq-t does.
The advantage to this is that a break point can be placed on showreqs, so that
upon showing the stack, you jump immediately into the debugger.  While sysrq-t
does the same thing, sysrq-t shows *all* threads stacks.  It also doesn't work
right now.  In the future, I thought it might be acceptable to make this show
all pids stacks, but perhaps leaving well enough alone and just using sysrq-t
would be okay.  For now, upon receiving the stack command, UML switches
context to that thread, dumps its registers, and then switches context back to
the original thread.  Since UML compacts all threads into one of 4 host
threads, this sort of mechanism could be expanded in the future to include
other debugging helpers that sysrq does not cover.

Note by jdike - The main benefit to this is that it brings an arbitrary thread
back into context, where it can be examined by gdb.  The fact that it dumps it
stack is secondary.  This provides the capability to examine a sleeping
thread, which has existed in tt mode, but not in skas mode until now.

Also, the other threads, that sysrq doesn't cover, can be gdb-ed directly
anyway.

Signed-off-by: Allan Graves<allan.graves@gmail.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-17 11:49:59 -07:00
..
skas [PATCH] uml: _switch_to code consolidation 2005-09-17 11:49:59 -07:00
tt [PATCH] uml: _switch_to code consolidation 2005-09-17 11:49:59 -07:00
asm-offsets.c kbuild: um fix so it compile with generic asm-offsets.h support 2005-09-09 23:10:54 +02:00
config.c.in Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
dyn.lds.S [PATCH] i386 / uml: add dwarf sections to static link script 2005-09-10 12:00:17 -07:00
exec_kern.c [PATCH] uml: remove 2_5compat.h 2005-05-28 16:46:11 -07:00
exitcode.c [PATCH] uml: Clean up prink calls 2005-07-28 21:46:05 -07:00
gmon_syms.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
gprof_syms.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
helper.c [PATCH] uml: fix misdeclared function 2005-07-27 16:25:49 -07:00
init_task.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
initrd.c [PATCH] uml: initrd cleanup 2005-05-20 15:48:18 -07:00
irq_user.c [PATCH] uml: add and use generic hw_controller_type->release 2005-06-21 19:07:32 -07:00
irq.c [PATCH] uml: use host AIO support 2005-09-05 00:06:23 -07:00
ksyms.c [PATCH] uml: inline mk_pte and various friends 2005-09-10 12:00:18 -07:00
main.c [PATCH] uml: workaround GDB problems on debugging 2005-09-05 00:06:20 -07:00
Makefile [PATCH] uml: move libc-dependent startup and signal code 2005-09-05 00:06:24 -07:00
mem_user.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mem.c [PATCH] bogus #if (arch/um/kernel/mem.c) 2005-09-07 17:17:34 -07:00
physmem.c [PATCH] uml: inline mk_pte and various friends 2005-09-10 12:00:18 -07:00
process_kern.c [PATCH] uml: breakpoint an arbitrary thread 2005-09-17 11:49:59 -07:00
ptrace.c [PATCH] uml: fix a couple of warnings 2005-05-28 16:46:11 -07:00
reboot.c [PATCH] Don't export machine_restart, machine_halt, or machine_power_off. 2005-07-26 14:35:42 -07:00
resource.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sigio_kern.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sigio_user.c [PATCH] uml: Fix SIGWINCH relaying 2005-05-05 16:36:36 -07:00
signal_kern.c [PATCH] convert signal handling of NODEFER to act like other Unix boxes. 2005-08-29 10:03:11 -07:00
signal_user.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
smp.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
syscall_kern.c [PATCH] uml: fork cleanup 2005-06-25 16:24:35 -07:00
syscall.c [PATCH] uml: system call path cleanup 2005-09-05 00:06:23 -07:00
sysrq.c [PATCH] uml: stack dump fix 2005-05-28 16:46:13 -07:00
tempfile.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
time_kern.c [PATCH] uml: Fix load average >=1 2005-07-28 21:46:04 -07:00
time.c [PATCH] uml: Proper clone support for skas0 2005-07-07 18:23:44 -07:00
tlb.c [PATCH] uml: skas0 stubs now check system call return values 2005-09-05 00:06:24 -07:00
trap_kern.c [PATCH] uml: avoid already done dirtying 2005-09-10 12:00:18 -07:00
trap_user.c [PATCH] uml: remove debugging code from page fault path 2005-09-05 00:06:19 -07:00
tty_log.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
uaccess_user.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
um_arch.c [PATCH] uml: move libc-dependent startup and signal code 2005-09-05 00:06:24 -07:00
umid.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
uml.lds.S [PATCH] i386 / uml: add dwarf sections to static link script 2005-09-10 12:00:17 -07:00
user_util.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
vmlinux.lds.S [PATCH] uml: include the linker script rather than symlink it 2005-05-05 16:36:33 -07:00