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kernel: debug: Centralize dbg_[de]activate_sw_breakpoints 

During debug trap execution we expect dbg_deactivate_sw_breakpoints()
to be paired with an dbg_activate_sw_breakpoint(). Currently although
the calls are paired correctly they are needlessly smeared across three
different functions. Worse this also results in code to drive polled I/O
being called with breakpoints activated which, in turn, needlessly
increases the set of functions that will recursively trap if breakpointed.

Fix this by moving the activation of breakpoints into the debug core.

Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20200927211531.1380577-4-daniel.thompson@linaro.org
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
This commit is contained in:
Daniel Thompson 2020-09-27 22:15:31 +01:00
parent 4c4197eda7
commit 771910f719
3 changed files with 2 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
kernel/debug/debug_core.c
View File

@ -760,6 +760,8 @@ static int kgdb_cpu_enter(struct kgdb_state *ks, struct pt_regs *regs,
}
}
dbg_activate_sw_breakpoints();
/* Call the I/O driver's post_exception routine */
if (dbg_io_ops->post_exception)
dbg_io_ops->post_exception();

1
kernel/debug/gdbstub.c
View File

@ -1061,7 +1061,6 @@ int gdb_serial_stub(struct kgdb_state *ks)
error_packet(remcom_out_buffer, -EINVAL);
break;
}
dbg_activate_sw_breakpoints();
fallthrough; /* to default processing */
default:
default_handle:

2
kernel/debug/kdb/kdb_debugger.c
View File

@ -147,7 +147,6 @@ int kdb_stub(struct kgdb_state *ks)
return DBG_PASS_EVENT;
}
kdb_bp_install(ks->linux_regs);
dbg_activate_sw_breakpoints();
/* Set the exit state to a single step or a continue */
if (KDB_STATE(DOING_SS))
gdbstub_state(ks, "s");
@ -167,7 +166,6 @@ int kdb_stub(struct kgdb_state *ks)
* differently vs the gdbstub
*/
kgdb_single_step = 0;
dbg_deactivate_sw_breakpoints();
return DBG_SWITCH_CPU_EVENT;
}
return kgdb_info[ks->cpu].ret_state;