tree 0e3051e2d357548d086a2ac00c4bfe201fe4e31d
parent 9d1ee8ce92e16c6aa0a3fd91ee8ed9e403b3a2eb
author Richard Weinberger <richard@nod.at> 1379950682 +0200
committer Richard Weinberger <richard@nod.at> 1384684050 +0100

um: Make stack trace reliable against kernel mode faults

As UML uses an alternative signal stack we cannot use
the current stack pointer for stack dumping if UML itself
dies by SIGSEGV. To bypass this issue we save regs taken
from mcontext in our segv handler into thread_struct and
use these regs to obtain the stack pointer in show_stack().

Signed-off-by: Richard Weinberger <richard@nod.at>