[RFA] Sparc/Linux fixes part 1

["David S. Miller" <davem@redhat.com>]

Ok, let's try to split up these changes even more in hopes
someone might be able to start to look at least at the obvious
bits.

32-bit Sparc under Linux does not have a 16-byte long double,
this causes testsuite failures.  Fix this by providing a
SPARC_TARGET_LONG_DOUBLE_BYTES the OS specific target headers
can override.

Tested on sparc-linux-gnu, no regressions, a few new successes
:-)

2002-04-19  David S. Miller  <davem@redhat.com>

	* config/sparc/tm-sparc.h (SPARC_TARGET_LONG_DOUBLE_BYTES): New.
	(TARGET_LONG_DOUBLE_BIT): Define in non-multi-arch case.
	* config/sparc/tm-linux.h (SPARC_TARGET_LONG_DOUBLE_BYTES):
	Override.
	* config/sparc/tm-sp64linux.h (SPARC_TARGET_LONG_DOUBLE_BYTES):
	Override.
	* sparc-tdep.c (sparc_gdbarch_init): Use
	SPARC_TARGET_LONG_DOUBLE_BYTES in set_gdbarch_long_double_bit
	call.  Do it after GDB_TARGET_IS_SPARC64 has stabilized.

--- ./config/sparc/tm-sparc.h.~1~	Mon Jan 28 20:42:44 2002
+++ ./config/sparc/tm-sparc.h	Fri Apr 19 13:55:48 2002
@@ -137,6 +137,8 @@ extern int sparc_intreg_size (void);
 #endif
 #endif
 
+#define SPARC_TARGET_LONG_DOUBLE_BYTES	16
+
 #if !defined (GDB_MULTI_ARCH) || (GDB_MULTI_ARCH == 0)
 /*
  * The following defines must go away for MULTI_ARCH
@@ -175,6 +177,11 @@ extern int sparc_intreg_size (void);
    real way to know how big a register is.  */
 
 #define REGISTER_SIZE 4
+
+/* Say how large a 'long double' is.  */
+
+#define TARGET_LONG_DOUBLE_BIT \
+        (SPARC_TARGET_LONG_DOUBLE_BYTES * TARGET_CHAR_BIT)
 
 /* Number of machine registers */
 
--- ./config/sparc/tm-linux.h.~1~	Sun Feb 24 14:56:07 2002
+++ ./config/sparc/tm-linux.h	Fri Apr 19 13:58:11 2002
@@ -25,6 +25,9 @@
 
 #include "sparc/tm-sparc.h"
 
+#undef SPARC_TARGET_LONG_DOUBLE_BYTES
+#define SPARC_TARGET_LONG_DOUBLE_BYTES 8
+
 #define SIGCONTEXT_PC_OFFSET 12
 
 #include "tm-linux.h"
--- ./config/sparc/tm-sp64linux.h.~1~	Sun Feb 24 14:56:07 2002
+++ ./config/sparc/tm-sp64linux.h	Fri Apr 19 13:58:03 2002
@@ -25,6 +25,10 @@ Foundation, Inc., 59 Temple Place - Suit
 
 #include "sparc/tm-sp64.h"
 
+#undef SPARC_TARGET_LONG_DOUBLE_BYTES
+#define SPARC_TARGET_LONG_DOUBLE_BYTES \
+	(GDB_TARGET_IS_SPARC64 ? 16 : 8)
+
 #define SIGCONTEXT_PC_OFFSET 16  /* See asm-sparc64/sigcontext.h */
 
 /* We always want full V9 + Ultra VIS stuff... */
--- ./sparc-tdep.c.~1~	Fri Apr 12 11:18:57 2002
+++ ./sparc-tdep.c	Fri Apr 19 13:57:40 2002
@@ -2970,7 +2970,6 @@ sparc_gdbarch_init (struct gdbarch_info 
   set_gdbarch_init_extra_frame_info (gdbarch, sparc_init_extra_frame_info);
   set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
   set_gdbarch_int_bit (gdbarch, 4 * TARGET_CHAR_BIT);
-  set_gdbarch_long_double_bit (gdbarch, 16 * TARGET_CHAR_BIT);
   set_gdbarch_long_long_bit (gdbarch, 8 * TARGET_CHAR_BIT);
   set_gdbarch_max_register_raw_size (gdbarch, 8);
   set_gdbarch_max_register_virtual_size (gdbarch, 8);
@@ -3114,6 +3113,11 @@ sparc_gdbarch_init (struct gdbarch_info 
       tdep->call_dummy_call_offset = 148 + 4 * 5;
       break;
     }
+
+  /* Set this after GDB_TARGET_IS_SPARC64 has stabilized.  */
+  set_gdbarch_long_double_bit (gdbarch,
+			       SPARC_TARGET_LONG_DOUBLE_BYTES
+			       * TARGET_CHAR_BIT);
 
   /* 
    * Settings that vary per-architecture: