[PATCH]: SH 2a - Part 3: Bank register handling

[Corinna Vinschen <vinschen@redhat.com>]

Hi,

this is SH 2a patch 2.  It handles the "bank" pseudo register so
that reading and writing is performed on the correct register set
inside of the register banks.


Corinna

	* sh-tdep.c (sh_pseudo_register_read): Add PSEUDO_BANK_REGNUM handling.
	(sh_pseudo_register_write): Ditto.

--- sh-tdep.c.2	2004-09-08 18:35:04.000000000 +0200
+++ sh-tdep.c	2004-09-08 18:35:31.000000000 +0200
@@ -1866,6 +1866,9 @@ sh_pseudo_register_read (struct gdbarch 
   int base_regnum, portion;
   char temp_buffer[MAX_REGISTER_SIZE];
 
+  if (reg_nr == PSEUDO_BANK_REGNUM)
+    regcache_raw_read (regcache, BANK_REGNUM, buffer);
+  else
   if (reg_nr >= DR0_REGNUM && reg_nr <= DR_LAST_REGNUM)
     {
       base_regnum = dr_reg_base_num (reg_nr);
@@ -1902,7 +1905,19 @@ sh_pseudo_register_write (struct gdbarch
   int base_regnum, portion;
   char temp_buffer[MAX_REGISTER_SIZE];
 
-  if (reg_nr >= DR0_REGNUM && reg_nr <= DR_LAST_REGNUM)
+  if (reg_nr == PSEUDO_BANK_REGNUM)
+    {
+      /* When the bank register is written to, the whole register bank
+         is switched and all values in the bank registers must be read
+	 from the target/sim again. We're just invalidating the regcache
+	 so that a re-read happens next time it's necessary.  */
+      int bregnum;
+
+      regcache_raw_write (regcache, BANK_REGNUM, buffer);
+      for (bregnum = R0_BANK0_REGNUM; bregnum < MACLB_REGNUM; ++bregnum)
+        set_register_cached (bregnum, 0);
+    }
+  else if (reg_nr >= DR0_REGNUM && reg_nr <= DR_LAST_REGNUM)
     {
       base_regnum = dr_reg_base_num (reg_nr);
 

-- 
Corinna Vinschen
Cygwin Project Co-Leader
Red Hat, Inc.