Re: [PATCH][SH] Signal handler unwinding for SH-Linux

[Yao Qi <yao@codesourcery.com>]

On 04/29/2012 04:05 PM, Chung-Lin Tang wrote:
> The test results show improvement on many sighandler related tests, with
> no regressions. Some gdb.base/sigbpt.exp tests change from FAIL->KFAIL,
> though I'm not completely sure what that indicates.
Chung-Lin,
Not sure the comment at the beginning of gdb.base/sigbpt.exp is relevant
to your KFAILs.

# This test is known to tickle the following problems: kernel letting
# the inferior execute both the system call, and the instruction
# following, when single-stepping a system call; kernel failing to
# propogate the single-step state when single-stepping the sigreturn
# system call, instead resuming the inferior at full speed; GDB
# doesn't know how to software single-step across a sigreturn
# instruction.  Since the kernel problems can be "fixed" using
# software single-step this is KFAILed rather than XFAILed.

If this comment is related to your KFAILs, this can be handled by
computing the "next pc" of sigreturn or rt_sigreturn.  Please have a
look at functions {arm,mips,tic6x}_linux_syscall_next_pc.  You can do
something similar in SH backend.  Hope it helps.

-- 
Yao (齐尧)