x86 ptrace: block-step fix

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The enable_single_step() logic bails out early if TF is already set.
That skips some of the bookkeeping that keeps things straight.
This makes PTRACE_SINGLEBLOCK break the behavior of a user task
that was already setting TF itself in user mode.

Fix the bookkeeping to notice the old TF setting as it should.

Test case at: http://sources.redhat.com/cgi-bin/cvsweb.cgi/~checkout~/tests/ptrace-tests/tests/step-jump-cont-strict.c?cvsroot=systemtap

Signed-off-by: Roland McGrath <roland@redhat.com>

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This commit is contained in:

Roland McGrath 2008-07-09 01:07:02 -07:00

parent a3cf859321

commit 6718d0d6da

1 changed files with 16 additions and 6 deletions

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arch/x86/kernel/step.c

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