Re: print_npx_status_word

["Baars, M.J." <mjbaars1977 dot gdb at gmail dot com>]

On 04/18/2011 07:03 PM, Tom Tromey wrote:
> > > > > > "Michael" == Baars, M J<mjbaars1977.gdb@gmail.com>  writes:
Hi Tom,

Thank you for your reply, for your convenience I attached a slightly 
different version already.
> Michael>  Oops... did I remove one of your entries in the ChangeLog? :)
>
> As others have noted, ChangeLog is "prepend only".
> We generally don't edit old entries.
As I stated before, it would be unwise though to keep unmaintained 
function names in the log entries. You can apply the changes optionally, 
but I strongly advise against retaining the original log entries.
> Michael>  +struct
> Michael>  +{
> Michael>  +	char *tag;
> Michael>  +	char *description;
> Michael>  +}
>
> Wrong indentation here, should be 2 spaces.
> Fields should have descriptive comments.
> I think the struct should have a tag and be terminated here.
> Also the fields should be "const".
Here you are completely right, I added the 'const' operators. If you 
don't like the indentation, I suggest you instead modify you 
tab-settings locally. Personally I'm used programming with a little more 
space than.
> Michael>  +static const npx_exception_flags[6] =
> Michael>  +
> Michael>  +{
> Michael>  +	{"IE", "invalid operation"},
>
> Wrong indentation.  This is a problem in the whole patch.
>
> Michael>  +// print the numeric coprocessor extension (npx) status word
>
> No `//' comments.
I have taken this into account, does that also hold for inline comments?
> Comments should be full sentences, see GNU standards.
>
> Michael>  +void print_npx_status_word(uint16_t npx_status_word, struct ui_file *file)
>
> Newline after "void".
> Space before "(" -- a problem in a few spots.
> Again, GNU standards.
Hope you'll make an exception here, I like the code better this way :)
> Tom
Regards,
Michael.

--- ./gdb-7.2/gdb/ChangeLog	2010-09-03 01:37:25.000000000 +0200
+++ ./gdb-7.2.2/gdb/ChangeLog	2011-04-16 22:56:35.359736001 +0200
@@ -1,3 +1,11 @@
+2011-04-16	Ir. M.J. Baars <mjbaars1977.gdb@gmail.com>
+
+	* i387-tdep.c (print_npx_control_word) - new function
+
+2011-04-14	Ir. M.J. Baars <mjbaars1977.gdb@gmail.com>
+
+	* i387-tdep.c (print_npx_status_word) - new function
+
 2010-09-02  Joel Brobecker  <brobecker@adacore.com>
 
 	* NEWS: Replace "Changes since GDB 7.1" by "Changes in GDB 7.2".

--- ./gdb-7.2/gdb/ChangeLog-1999	2001-01-12 04:44:31.000000000 +0100
+++ ./gdb-7.2.2/gdb/ChangeLog-1999	2011-04-16 22:53:25.543736000 +0200
@@ -581,9 +581,9 @@ Wed Dec  8 15:29:48 1999  Andrew Cagney
 	Patch from Mark Kettenis  <kettenis@gnu.org>:
 
 	* config/i386/tm-i386.h (FLOAT_INFO): New define.
-	* i387-tdep.c (print_i387_value, print_i387_ext,
-	print_i387_status_word, print_i387_control_word, i387_float_info):
-	New functions, used to implement generic `info float' command.
+	
+	* i387-tdep.c (print_i387_value,print_i387_ext,i387_float_info):
+	  New functions, used to implement generic `info float' command.
 
 1999-12-06  Christopher Faylor  <cgf@cygnus.com>
 

--- ./gdb-7.2/gdb/ChangeLog-2001	2002-01-06 05:37:53.000000000 +0100
+++ ./gdb-7.2.2/gdb/ChangeLog-2001	2011-04-14 15:55:22.631948002 +0200
@@ -8076,11 +8076,6 @@ Wed Apr  4 21:48:42 2001  Christopher Fa
 
 	* MAINTAINERS: Add myself to write after approval list.
 
-2001-03-09  Mark Kettenis  <kettenis@gnu.org>
-
-	* i387-tdep.c (print_i387_status_word): Fix printing of Stack
-	fault flag.  It is bit 6 of the x87 FPU status word, not bit 7.
-
 2001-03-08  Andrew Cagney  <ac131313@redhat.com>
 
 	* configure.host (m88*-harris-cxux*): Mark as obsolete.

--- ./gdb-7.2/gdb/ChangeLog-2002	2004-04-24 00:15:17.000000000 +0200
+++ ./gdb-7.2.2/gdb/ChangeLog-2002	2011-04-16 22:54:05.451736001 +0200
@@ -5396,12 +5396,14 @@ Fri Sep 13 07:42:09 2002  Andrew Cagney
 	* config/i386/tm-i386.h: Don't include "regcache.h".
 
 	* i387-tdep.h (i387_print_float_info): New prototype.
-	* i387-tdep.c (print_i387_value, print_i387_ext,
-	print_i387_status_word, print_i387_control_word): Add `struct
-	ui_file *' argument and use it for output.
-	(i387_print_float_info): Renamed from i387_float_info.  Add
-	`struct gdbarch *' and `struct ui_file *' arguments and use the
-	latter for output.
+
+	* i387-tdep.c (print_i387_value,print_i387_ext):
+	  Add `struct ui_file *' argument and use it for output.
+
+	* i387-tdep.c (i387_print_float_info):
+	  Renamed from i387_float_info.  Add `struct gdbarch *' and `struct ui_file *' arguments
+	  and use the latter for output.
+
 	* i386-tdep.c: Include "i387-tdep.h".
 	(i386_gdbarch_init): Set print_float_info.
 	* config/i386/tm-i386.h (i387_float_info): Remove prototype.

--- ./gdb-7.2/gdb/ChangeLog-2004	2006-10-24 22:23:56.000000000 +0200
+++ ./gdb-7.2.2/gdb/ChangeLog-2004	2011-04-16 22:54:31.555736002 +0200
@@ -3468,9 +3468,9 @@
 	* ui-out.c (ui_out_field_core_addr): Ditto.
 	* breakpoint.c (breakpoint_adjustment_warning): Ditto.
 	* exec.c (print_section_info): Ditto.
-	* i387-tdep.c (print_i387_status_word): Ditto.
-	(print_i387_control_word): Ditto.
-	(i387_print_float_info): Ditto.
+
+	* i387-tdep.c (i387_print_float_info): Ditto.
+
 	* maint.c (maint_print_section_info): Ditto.
 	* solib.c (info_sharedlibrary_command): Ditto.
 	* somsolib.c (som_sharedlibrary_info_command): Ditto.

--- ./gdb-7.2/gdb/i387-tdep.c	2010-05-05 21:30:36.000000000 +0200
+++ ./gdb-7.2.2/gdb/i387-tdep.c	2011-04-19 20:42:56.691027998 +0200
@@ -36,6 +36,106 @@
 #include "i387-tdep.h"
 #include "i386-xstate.h"
 
+struct
+{
+	const char *tag;
+	const char *description;
+}
+
+static const npx_exception_flags[6] =
+
+{
+	{"IE", "invalid operation"},
+	{"DE", "denormalized operand"},
+	{"ZE", "zero divide"},
+	{"OE", "overflow"},
+	{"UE", "underflow"},
+	{"PE", "precision"}
+};
+
+struct
+{
+	const char *tag;
+	const char *description;
+}
+
+static const npx_exception_mask[6] =
+
+{
+	{"IM", "invalid operation"},
+	{"DM", "denormalized operand"},
+	{"ZM", "zero divide"},
+	{"OM", "overflow"},
+	{"UM", "underflow"},
+	{"PM", "precision"}
+};
+
+static const char *npx_precision_control[4] = 
+{
+	"24-bits (single precision)", 
+	"(reserved)", 
+	"53-bits (double precision)", 
+	"64-bits (extended precision)"
+};
+
+static const char *npx_rounding_control[4] = 
+{
+	"round to nearest or even", 
+	"round down (towards -inf)", 
+	"round up (toward +inf)", 
+	"chop (truncate toward zero)"
+};
+
+/* print the numeric coprocessor extension (npx) status word */
+void print_npx_status_word(uint16_t npx_status_word, struct ui_file *file)
+{
+	fprintf_filtered(file, "status word              : 0x%04X\n", npx_status_word);
+
+	fprintf_filtered(file, "  exception flags        : ");
+
+	fprintf_filtered(file, "%s ", ((npx_status_word >> 0x0005) & 0x0001) ? npx_exception_flags[5].tag : "  ");	// precision
+	fprintf_filtered(file, "%s ", ((npx_status_word >> 0x0004) & 0x0001) ? npx_exception_flags[4].tag : "  ");	// underflow
+	fprintf_filtered(file, "%s ", ((npx_status_word >> 0x0003) & 0x0001) ? npx_exception_flags[3].tag : "  ");	// overflow
+	fprintf_filtered(file, "%s ", ((npx_status_word >> 0x0002) & 0x0001) ? npx_exception_flags[2].tag : "  ");	// zero divide
+	fprintf_filtered(file, "%s ", ((npx_status_word >> 0x0001) & 0x0001) ? npx_exception_flags[1].tag : "  ");	// denormalized operand
+	fprintf_filtered(file, "%s ", ((npx_status_word >> 0x0000) & 0x0001) ? npx_exception_flags[0].tag : "  ");	// invalid operation
+	fprintf_filtered(file, "\n");
+
+	fprintf_filtered(file, "  stack fault            : %u\n", ((npx_status_word >> 0x0006) & 0x0001));
+	fprintf_filtered(file, "  error summary status   : %u\n", ((npx_status_word >> 0x0007) & 0x0001));
+	fprintf_filtered(file, "  busy                   : %u\n", ((npx_status_word >> 0x000F) & 0x0001));
+	fprintf_filtered(file, "  top of stack pointer   : %u\n", ((npx_status_word >> 0x000B) & 0x0007));
+
+	fprintf_filtered(file, "  condition code         : ");
+
+	fprintf_filtered(file, "%s ", ((npx_status_word >> 0x000E) & 0x0001) ? "C3" : "  ");
+	fprintf_filtered(file, "%s ", ((npx_status_word >> 0x000A) & 0x0001) ? "C2" : "  ");
+	fprintf_filtered(file, "%s ", ((npx_status_word >> 0x0009) & 0x0001) ? "C1" : "  ");
+	fprintf_filtered(file, "%s ", ((npx_status_word >> 0x0008) & 0x0001) ? "C0" : "  ");
+	fprintf_filtered(file, "\n");
+}
+
+/* print the numeric coprocessor extension (npx) control word */
+void print_npx_control_word(uint16_t npx_control_word, struct ui_file *file)
+{
+	fprintf_filtered(file, "control word             : 0x%04X\n", npx_control_word);
+
+	fprintf_filtered(file, "  exception mask         : ");
+
+	fprintf_filtered(file, "%s ", ((npx_control_word >> 0x0005) & 0x0001) ? npx_exception_mask[5].tag : "  ");	// precision
+	fprintf_filtered(file, "%s ", ((npx_control_word >> 0x0004) & 0x0001) ? npx_exception_mask[4].tag : "  ");	// underflow
+	fprintf_filtered(file, "%s ", ((npx_control_word >> 0x0003) & 0x0001) ? npx_exception_mask[3].tag : "  ");	// overflow
+	fprintf_filtered(file, "%s ", ((npx_control_word >> 0x0002) & 0x0001) ? npx_exception_mask[2].tag : "  ");	// zero divide
+	fprintf_filtered(file, "%s ", ((npx_control_word >> 0x0001) & 0x0001) ? npx_exception_mask[1].tag : "  ");	// denormalized operand
+	fprintf_filtered(file, "%s ", ((npx_control_word >> 0x0000) & 0x0001) ? npx_exception_mask[0].tag : "  ");	// invalid operation
+	fprintf_filtered(file, "\n");
+
+	fprintf_filtered(file, "  precision control (PC) : %s\n", npx_precision_control[((npx_control_word >> 0x0008) & 0x0003)]);
+	fprintf_filtered(file, "  rounding control (RC)  : %s\n", npx_rounding_control[((npx_control_word >> 0x000A) & 0x0003)]);
+
+	fprintf_filtered(file, "  infinity control       : %u\n", ((npx_control_word >> 0x000C) & 0x0001));
+}
+
 /* Print the floating point number specified by RAW.  */
 
 static void
@@ -114,88 +214,6 @@ print_i387_ext (struct gdbarch *gdbarch,
     fputs_filtered (" Unsupported", file);
 }
 
-/* Print the status word STATUS.  */
-
-static void
-print_i387_status_word (unsigned int status, struct ui_file *file)
-{
-  fprintf_filtered (file, "Status Word:         %s",
-		    hex_string_custom (status, 4));
-  fputs_filtered ("  ", file);
-  fprintf_filtered (file, " %s", (status & 0x0001) ? "IE" : "  ");
-  fprintf_filtered (file, " %s", (status & 0x0002) ? "DE" : "  ");
-  fprintf_filtered (file, " %s", (status & 0x0004) ? "ZE" : "  ");
-  fprintf_filtered (file, " %s", (status & 0x0008) ? "OE" : "  ");
-  fprintf_filtered (file, " %s", (status & 0x0010) ? "UE" : "  ");
-  fprintf_filtered (file, " %s", (status & 0x0020) ? "PE" : "  ");
-  fputs_filtered ("  ", file);
-  fprintf_filtered (file, " %s", (status & 0x0080) ? "ES" : "  ");
-  fputs_filtered ("  ", file);
-  fprintf_filtered (file, " %s", (status & 0x0040) ? "SF" : "  ");
-  fputs_filtered ("  ", file);
-  fprintf_filtered (file, " %s", (status & 0x0100) ? "C0" : "  ");
-  fprintf_filtered (file, " %s", (status & 0x0200) ? "C1" : "  ");
-  fprintf_filtered (file, " %s", (status & 0x0400) ? "C2" : "  ");
-  fprintf_filtered (file, " %s", (status & 0x4000) ? "C3" : "  ");
-
-  fputs_filtered ("\n", file);
-
-  fprintf_filtered (file,
-		    "                       TOP: %d\n", ((status >> 11) & 7));
-}
-
-/* Print the control word CONTROL.  */
-
-static void
-print_i387_control_word (unsigned int control, struct ui_file *file)
-{
-  fprintf_filtered (file, "Control Word:        %s",
-		    hex_string_custom (control, 4));
-  fputs_filtered ("  ", file);
-  fprintf_filtered (file, " %s", (control & 0x0001) ? "IM" : "  ");
-  fprintf_filtered (file, " %s", (control & 0x0002) ? "DM" : "  ");
-  fprintf_filtered (file, " %s", (control & 0x0004) ? "ZM" : "  ");
-  fprintf_filtered (file, " %s", (control & 0x0008) ? "OM" : "  ");
-  fprintf_filtered (file, " %s", (control & 0x0010) ? "UM" : "  ");
-  fprintf_filtered (file, " %s", (control & 0x0020) ? "PM" : "  ");
-
-  fputs_filtered ("\n", file);
-
-  fputs_filtered ("                       PC: ", file);
-  switch ((control >> 8) & 3)
-    {
-    case 0:
-      fputs_filtered ("Single Precision (24-bits)\n", file);
-      break;
-    case 1:
-      fputs_filtered ("Reserved\n", file);
-      break;
-    case 2:
-      fputs_filtered ("Double Precision (53-bits)\n", file);
-      break;
-    case 3:
-      fputs_filtered ("Extended Precision (64-bits)\n", file);
-      break;
-    }
-      
-  fputs_filtered ("                       RC: ", file);
-  switch ((control >> 10) & 3)
-    {
-    case 0:
-      fputs_filtered ("Round to nearest\n", file);
-      break;
-    case 1:
-      fputs_filtered ("Round down\n", file);
-      break;
-    case 2:
-      fputs_filtered ("Round up\n", file);
-      break;
-    case 3:
-      fputs_filtered ("Round toward zero\n", file);
-      break;
-    }
-}
-
 /* Print out the i387 floating point state.  Note that we ignore FRAME
    in the code below.  That's OK since floating-point registers are
    never saved on the stack.  */
@@ -268,8 +286,12 @@ i387_print_float_info (struct gdbarch *g
 
   fputs_filtered ("\n", file);
 
-  print_i387_status_word (fstat, file);
-  print_i387_control_word (fctrl, file);
+	print_npx_status_word(fstat, file);
+	fprintf_filtered(file, "\n");
+
+	print_npx_control_word(fctrl, file);
+	fprintf_filtered(file, "\n");
+
   fprintf_filtered (file, "Tag Word:            %s\n",
 		    hex_string_custom (ftag, 4));
   fprintf_filtered (file, "Instruction Pointer: %s:",