m68k: Simplify the singlestepping handling in signals

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Instead of checking the return value of do_signal() we can just do
the work (raise SIGTRAP and clear SR.T1) directly in handle_signal(),
when setting the sigframe up.  Simplifies the assembler glue and is
closer to the way we do it on other targets.

Note that do_delayed_trace does *not* disappear; it's still needed
to deal with single-stepping through syscall, since 68040 doesn't
raise the trace exception at all if the trap exception is pending.
We hit it after returning from sys_...() if TIF_DELAYED_TRACE is
set; all that has changed is that we don't reuse it for "single-step
into the handler" codepath.

As the result, do_signal() doesn't need to return anything anymore.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

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Al Viro 2010-10-02 22:57:30 -04:00 • committed by Geert Uytterhoeven

parent e68847fee7

commit 9e4930dbf1

2 changed files with 8 additions and 9 deletions

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6

arch/m68k/kernel/entry.S

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11

arch/m68k/kernel/signal.c

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