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authorPavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>2020-10-03 20:13:43 +0300
committerPaolo Bonzini <pbonzini@redhat.com>2020-10-06 08:34:49 +0200
commitfda8458bd3a9cb3108ba2f09921b6e3eee0d1bf3 (patch)
tree4b7b6c3338cebb15cd8d1246a2e5a550de3320c2 /docs
parentf9a9fb6516b453d2318eca0fc5eecc4c57f6b065 (diff)
gdbstub: add reverse step support in replay mode
GDB remote protocol supports two reverse debugging commands: reverse step and reverse continue. This patch adds support of the first one to the gdbstub. Reverse step is intended to step one instruction in the backwards direction. This is not possible in regular execution. But replayed execution is deterministic, therefore we can load one of the prior snapshots and proceed to the desired step. It is equivalent to stepping one instruction back. There should be at least one snapshot preceding the debugged part of the replay log. Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> -- v4 changes: - inverted condition in cpu_handle_guest_debug (suggested by Alex Bennée) Message-Id: <160174522341.12451.1498758422543765253.stgit@pasha-ThinkPad-X280> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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