[RFA] Improvements for sh double register display

[Elena Zannoni]

Michael Snyder writes:
 > 2003-07-02  Michael Snyder  <msnyder@redhat.com>
 > 
 > 	* sh-tdep.c (do_dr_register_info): Fix register number output
 > 	(0, 2, 4, ... not 0, 1, 2...).  Display DP register both in
 > 	hex and in floating point (noting when it is not valid FP).
 > 
 > Index: sh-tdep.c
 > ===================================================================
 > RCS file: /cvs/src/src/gdb/sh-tdep.c,v
 > retrieving revision 1.132
 > diff -p -r1.132 sh-tdep.c
 > *** sh-tdep.c	13 Jun 2003 04:40:34 -0000	1.132
 > --- sh-tdep.c	2 Jul 2003 18:00:22 -0000
 > *************** static void
 > *** 3928,3938 ****
 >   do_dr_register_info (int dr_regnum)
 >   {
 >     int first_fp_reg_num = dr_reg_base_num (dr_regnum);
 >   
 > !   printf_filtered ("dr%d\t0x%08x%08x\n", 
 > ! 		    dr_regnum - gdbarch_tdep (current_gdbarch)->DR0_REGNUM, 
 > ! 		    (int) read_register (first_fp_reg_num),
 > ! 		    (int) read_register (first_fp_reg_num + 1));
 >   }
 >   
 >   /* Double precision registers, compact mode. */
 > --- 3928,3962 ----
 >   do_dr_register_info (int dr_regnum)
 >   {
 >     int first_fp_reg_num = dr_reg_base_num (dr_regnum);
 > +   char *raw_buffer;
 > +   double dbl;
 > +   int inv;
 >   
 > !   /* Allocate space for the float. */
 > !   raw_buffer = (char *) alloca (2 * REGISTER_RAW_SIZE (FP0_REGNUM));

Can you use something other than alloca here? Also, this will collide
in mid air with Corinna's revamp. Maybe you can revisit this after she
is done? Otherwise it's ok.

elena

 > ! 
 > !   /* Get the data in raw format.  */
 > !   if (!frame_register_read (get_selected_frame (), 
 > ! 			    first_fp_reg_num, raw_buffer)
 > !       || !frame_register_read (get_selected_frame (), 
 > ! 			       first_fp_reg_num + 1, 
 > ! 			       raw_buffer + REGISTER_RAW_SIZE (FP0_REGNUM)))
 > !     error ("can't read register %d (%s)", 
 > ! 	   dr_regnum, REGISTER_NAME (dr_regnum));
 > ! 
 > !   /* Get the register as a number */ 
 > !   dbl = unpack_double (builtin_type_double, raw_buffer, &inv);
 > ! 
 > !   dr_regnum = 2 * (dr_regnum - gdbarch_tdep (current_gdbarch)->DR0_REGNUM);
 > !   printf_filtered ("dr%d\t0x%08x%08x  ", 
 > ! 		   dr_regnum,
 > ! 		   (int) read_register (first_fp_reg_num),
 > ! 		   (int) read_register (first_fp_reg_num + 1));
 > ! 
 > !   if (inv)
 > !     printf_filtered ("<invalid double>\n");
 > !   else
 > !     printf_filtered ("(%.9g)\n", dbl);
 >   }
 >   
 >   /* Double precision registers, compact mode. */