于 2013/1/18 21:50, Joel Brobecker 写道:
>> tilegx has 64 registers, to show them in row will be not very
>> convinent to explore,
>> so we improve this by showing them in columns.
>>
>> (gdb) info registers
>> r0   0x0000000000000001    r19  0x0000000000000000    r38 0x0000000000000040
>> r1   0x000001ffffc7f458         r20  0x000001ffffc7f278         r39
>> 0x0000000000000000
>> r2   0x000001ffffc7f468         r21  0x000001ffffc7f298         r40
>> 0x000000000015b3e8
>> r3   0x0000000000010720    r22  0x000001ffffc7f280         r41
>> 0x000000000015882c
> Forgive me, but the above doesn't look easier to read... Was it
> because of wrap-around by your mailer or your MTA?

yes, I think it's caused by my mailer. please see attachment for the 
comparision

>
>> gdb/ChangeLog:
>>
>>         * tilegx-tdep.c (tilegx_print_registers_info): New function.
>>         show registers in columns.
> I am not a big specialist of formatting this type of information.
> To me the first 2 obvious remarks is that:
>
>    - The number of columns should be dynamic, depending on the width
>      of the terminal; and if the width is unset, then default to
>      80 characters. We may also have to make a decision if the width
>      is unlimited.
>
>    - This will need confirmation from the other Global Maintainers
>      but I think it would be better if you used the ui-out routines
>      to print the registers.
>
> One additional remark is that, with 64 registers, it might be good
> enough to print them in two columns always, and not deal with
> complexity of the terminal width. It even looks like you might be
> able to fit in 3 columns within 80 chars, if you prefer...

thanks for your good suggestion.
yes, 3 columns still be within 80 chars. and by display in 3 columns, it 
is with larger probability that the user do not need to scroll down and 
up his mouse to view the results. by 2 columns, the list is still a bit 
long, and the information is not that centered.

So, is this patch OK?
>
>
>> please review.
>>
>> ---
>> Regards,
>> Jiong
>> Tilera Corporation.
>>
>> ---
>>   gdb/tilegx-tdep.c |   63 +++++++++++++++++++++++++++++++++++++++++++++++++++++
>>   1 files changed, 63 insertions(+)
>>
>> diff --git a/gdb/tilegx-tdep.c b/gdb/tilegx-tdep.c
>> index 7f36bed..c19bdf9 100644
>> --- a/gdb/tilegx-tdep.c
>> +++ b/gdb/tilegx-tdep.c
>> @@ -940,6 +940,66 @@ tilegx_cannot_reference_register (struct gdbarch *gdbarch, int regno)
>>       return 1;
>>   }
>>   
>> +
>> +/* Tilera private register printer.  */
>> +#define MAX_COLUMNS 3
>> +static void
>> +tilegx_print_registers_info (struct gdbarch *gdbarch, struct ui_file *file,
>> +                             struct frame_info *frame,
>> +                             int regnum, int print_all)
>> +{
>> +  int i;
>> +  int j;
>> +  int k;
>> +  gdb_byte buffer[MAX_REGISTER_SIZE];
>> +
>> +  if (regnum != -1)
>> +    {
>> +      default_print_registers_info (gdbarch, file, frame, regnum, print_all);
>> +      return;
>> +    }
>> +
>> +  for (i = 0; i < TILEGX_NUM_EASY_REGS / MAX_COLUMNS + 1; ++i)
>> +    {
>> +      for (j = i;
>> +           j < TILEGX_NUM_EASY_REGS + 1;
>> +           j += TILEGX_NUM_EASY_REGS / MAX_COLUMNS + 1)
>> +        {
>> +	  /* Some registers are never available. Skip them and print PC.  */
>> +	  if (j > TILEGX_LR_REGNUM)
>> +	    j = TILEGX_PC_REGNUM;
>> +
>> +	  if (j > i)
>> +	    fprintf_filtered (file, "    ");
>> +
>> +	  fputs_filtered (gdbarch_register_name (gdbarch, j), file);
>> +	  print_spaces_filtered (5 - strlen (gdbarch_register_name
>> +					     (gdbarch, j)), file);
>> +
>> +	  /* Get the data in raw format.  */
>> +	  if (! deprecated_frame_register_read (frame, j, buffer))
>> +	    {
>> +	      fprintf_filtered (file, " *** no value *** ");
>> +	    }
>> +	  else
>> +	    {
>> +	      fprintf_filtered (file, "0x");
>> +	      for (k = 0; k < tilegx_reg_size; k++)
>> +		{
>> +		  int idx;
>> +		  if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)
>> +		    idx = k;
>> +		  else
>> +		    idx = tilegx_reg_size - 1 - k;
>> +		  fprintf_filtered (file, "%02x", (unsigned char) buffer[idx]);
>> +		}
>> +	    }
>> +        }
>> +
>> +      fprintf_filtered (file, "\n");
>> +    }
>> +}
>> +
>>   static struct gdbarch *
>>   tilegx_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
>>   {
>> @@ -1000,6 +1060,9 @@ tilegx_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
>>     /* Stack grows down.  */
>>     set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
>>   
>> +  /* Tilera private register printer */
>> +  set_gdbarch_print_registers_info (gdbarch, tilegx_print_registers_info);
>> +
>>     /* Frame Info.  */
>>     set_gdbarch_unwind_sp (gdbarch, tilegx_unwind_sp);
>>     set_gdbarch_unwind_pc (gdbarch, tilegx_unwind_pc);
>> -- 
>> 1.7.10.3
>>
>>
>