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Remove some comments in debug_reg_change_callback

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gdb/gdbserver:

2015-08-25  Yao Qi  <yao.qi@linaro.org>

	* linux-aarch64-low.c (debug_reg_change_callback): Remove comments.
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Yao Qi 2015-08-25 11:38:28 +01:00
parent 8ee525679d
commit 31a43dd5e1
2 changed files with 4 additions and 20 deletions
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4
gdb/gdbserver/ChangeLog
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@ -1,3 +1,7 @@
2015-08-25 Yao Qi <yao.qi@linaro.org>
* linux-aarch64-low.c (debug_reg_change_callback): Remove comments.
2015-08-25 Yao Qi <yao.qi@linaro.org>
* linux-aarch64-low.c (debug_reg_change_callback): Re-indent

20
gdb/gdbserver/linux-aarch64-low.c
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@ -276,26 +276,6 @@ debug_reg_change_callback (struct lwp_info *lwp, void *ptr)
&& (idx <= (is_watchpoint ? aarch64_num_wp_regs
: aarch64_num_bp_regs)));
/* The following assertion is not right, as there can be changes
that have not been made to the hardware debug registers
before new changes overwrite the old ones. This can happen,
for instance, when the breakpoint/watchpoint hit one of the
threads and the user enters continue; then what happens is:
1) all breakpoints/watchpoints are removed for all threads;
2) a single step is carried out for the thread that was hit;
3) all of the points are inserted again for all threads;
4) all threads are resumed.
The 2nd step will only affect the one thread in which the
bp/wp was hit, which means only that one thread is resumed;
remember that the actual updating only happen in
aarch64_linux_prepare_to_resume, so other threads remain
stopped during the removal and insertion of bp/wp. Therefore
for those threads, the change of insertion of the bp/wp
overwrites that of the earlier removals. (The situation may
be different when bp/wp is steppable, or in the non-stop
mode.) */
/* gdb_assert (DR_N_HAS_CHANGED (dr_changed, idx) == 0); */
/* The actual update is done later just before resuming the lwp,
we just mark that one register pair needs updating. */
DR_MARK_N_CHANGED (dr_changed, idx);