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Re: [PATCH] target attributes [4/5] gdbserver target attributes support


Post a new version make this patch can build with upstream.

Thanks,
Hui

2013-02-18  Hui Zhu  <hui_zhu@mentor.com>

	* config.in (BREAK_COUNT): New macro.
	* configure (--enable-break-count): New argument.
	* configure.ac (--enable-break-count): New argument.
	* inferiors.c (remove_process): Call break_count_list_remove_all.
	* linux-low.c (linux_wait_1): Call break_count_increase.
	* mem-break.c (break_count_s): New struct.
	(raw_breakpoint): Add count.
	(break_count_list_create, break_count_list_remove): New function.
	(current_break_count): New static variable.
	(gdb_condition_true_at_breakpoint): Set current_break_count.
	(break_count_list_remove_all): New function.
	(break_count_list_reset_s): New struct.
	(break_count_list_reset_1, break_count_list_reset,
	break_count_val, break_count_increase, get_target_attribute,
	set_target_attribute): New function.
	* mem-break.h (break_count_list_remove_all,
	break_count_list_reset, break_count_val, break_count_increase,
	get_target_attribute, set_target_attribute): New function.
	* server.c (start_inferior): Call break_count_list_reset.
	(handle_general_set): Call set_target_attribute.
	(handle_qxfer_target_attributes): New function.
	(qxfer_packets): Add "target-attributes".
	(handle_query): Add ";qXfer:target-attributes:read+".
	(handle_query): Call get_target_attribute.
	(handle_v_cont): Call break_count_list_reset.
	(myresume): Ditto.
	(process_serial_event): Ditto.
	(handle_target_event): Ditto.
	* server.h (break_count_s): New struct.
	(process_info): Add break_count_on, break_count_list
	and break_count_select.
	* tracepoint.c (get_trace_state_variable_value): Call
	break_count_val.

On Wed, Aug 29, 2012 at 4:12 PM, Hui Zhu <hui_zhu@mentor.com> wrote:
> This patch add target attributes $break_count_on, $break_count_select and
> $break_count_val.
> They make gdbserver support a function that count how many times the
> breakpoint is passed.
>
> $break_count_on is the switch of the breakpoint count function.
> The default value of it is 0, the breakpoint count function is closed.
> The default value of it is 1, function is opened and when inferior stop and
> continue again.  The count value of all the breakpoints will reset to 0.
> If it is set to 2, function is opened and the count value will not be reset.
>
> When count function is opened.  You can set the address of breakpoint to
> $break_count_select to select which count value you want to access in
> $break_count_val.
>
> $break_count_val can access to the value of a breakpoint count if you use
> GDB access it.
> And you can use it inside the condition of the breakpoint, its value is the
> value of current breakpoint count.
>
> For example:
> (gdb) target remote :1234
> Remote debugging using :1234
> Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols
> found)...done.
> Loaded symbols for /lib64/ld-linux-x86-64.so.2
> 0x00007ffff7ddb6b0 in ?? () from /lib64/ld-linux-x86-64.so.2
> (gdb) list
> 1       int
> 2       main()
> 3       {
> 4               while (1)
> 5                       printf("123\n");
> 6       }
> (gdb) set $break_count_on=1
> (gdb) b 5
> Breakpoint 1 at 0x4004f8: file w.c, line 5.
> (gdb) condition 1 ($break_count_val == 10)
> (gdb) c
> Continuing.
>
> Breakpoint 1, main () at w.c:5
> 5                       printf("123\n");
>
> In gdbserver part, you can see that:
> 123
> 123
> 123
> 123
> 123
> 123
> 123
> 123
> 123
>
> And you can use this function to count how many times the a address passed,
> for example:
> (gdb) set non-stop on
> (gdb) set target-async on
> (gdb) target remote :1234
> Remote debugging using :1234
> [New Thread 9363]
> (gdb)
> [Thread 9363] #1 stopped.
> 0x00007ffff7ddb6b0 in ?? ()
> set $break_count_on=2
> (gdb) list
> 1       int
> 2       main()
> 3       {
> 4               while (1)
> 5                       printf("123\n");
> 6       }
> (gdb) b 5
> Breakpoint 1 at 0x4004f8: file w.c, line 5.
> (gdb) condition 1 ($break_count_val == 0)
> (gdb) c&
> Continuing.
> (gdb) p $break_count_val
> $1 = 122472
> (gdb) p $break_count_val
> $2 = 136000
>
> PS, I didn't update doc for this function because I am not sure gdb doc want
> introduce gdbserver function or not.
>
>
> Thanks,
> Hui
>
> 2012-08-29  Hui Zhu  <hui_zhu@mentor.com>
>
>         * config.in (BREAK_COUNT): New macro.
>         * configure (--enable-break-count): New argument.
>         * configure.ac (--enable-break-count): New argument.
>         * inferiors.c (remove_process): Call break_count_list_remove_all.
>         * linux-low.c (linux_wait_1): Call break_count_increase.
>         * mem-break.c (break_count_s): New struct.
>         (raw_breakpoint): Add count.
>         (break_count_list_create, break_count_list_remove): New function.
>         (current_break_count): New static variable.
>         (gdb_condition_true_at_breakpoint): Set current_break_count.
>         (break_count_list_remove_all): New function.
>         (break_count_list_reset_s): New struct.
>         (break_count_list_reset_1, break_count_list_reset,
>         break_count_val, break_count_increase, get_target_attribute,
>         set_target_attribute): New function.
>         * mem-break.h (break_count_list_remove_all,
>         break_count_list_reset, break_count_val, break_count_increase,
>         get_target_attribute, set_target_attribute): New function.
>         * server.c (start_inferior): Call break_count_list_reset.
>         (handle_general_set): Call set_target_attribute.
>         (handle_qxfer_target_attributes): New function.
>         (qxfer_packets): Add "target-attributes".
>         (handle_query): Add ";qXfer:target-attributes:read+".
>         (handle_query): Call get_target_attribute.
>         (handle_v_cont): Call break_count_list_reset.
>         (myresume): Ditto.
>         (process_serial_event): Ditto.
>         (handle_target_event): Ditto.
>         * server.h (break_count_s): New struct.
>         (process_info): Add break_count_on, break_count_list
>         and break_count_select.
>         * tracepoint.c (get_trace_state_variable_value): Call
>         break_count_val.

Attachment: target_attribute_server_count.txt
Description: Text document


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