MN10300: gdbstub: Restrict single-stepping to non-preemptable non-SMP configs

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Restrict single-stepping through the kernel using gdbstub to non-preemptable
non-SMP configs as gdbstub has to do software single-stepping by means of
temporary breakpoints.  Hardware single-stepping is unavailable as Panasonic
have not sufficiently documented the interface to it.

Software single-stepping through preemptable or SMP kernels runs into problems
as it makes it much more likely that the wrong thread will hit the temporary
breakpoints.  It seems impractical to work around the problem for the most
part.  It could be possible to make a UP preemptable kernel switch temporary
breakpoints in and out in switch_to().

Signed-off-by: David Howells <dhowells@redhat.com>

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This commit is contained in:

David Howells 2011-03-18 16:54:29 +00:00

parent ddb7d1e975

commit 9ee21723cc

2 changed files with 18 additions and 2 deletions

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8

arch/mn10300/Kconfig.debug

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12

arch/mn10300/kernel/gdb-stub.c

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