[patch] sim: bfin: update return value in bfin_reg_{fetch,store}

[Mike Frysinger <vapier at gentoo dot org>]

The latest gdb sim-remote.c really wants a return value from the fetch/store
register functions, so update the Blackfin sim to avoid the warnings/errors.

Committed to master and gdb-7.5 branch.

2012-07-31  Mike Frysinger  <vapier@gentoo.org>

	* machs.c (bfin_reg_fetch): Change return 0 to return -1, and
	return -1 to return 4.
	(bfin_reg_store): Likewise.

--- a/sim/bfin/machs.c
+++ b/sim/bfin/machs.c
@@ -1859,7 +1859,7 @@ bfin_reg_fetch (SIM_CPU *cpu, int rn, unsigned char *buf, int len)
   else if (rn == SIM_BFIN_CC_REGNUM)
     value = CCREG;
   else
-    return 0; // will be an error in gdb
+    return -1;
 
   /* Handle our KSP/USP shadowing in SP.  While in supervisor mode, we
      have the normal SP/USP behavior.  User mode is tricky though.  */
@@ -1874,7 +1874,7 @@ bfin_reg_fetch (SIM_CPU *cpu, int rn, unsigned char *buf, int len)
 
   bfin_store_unsigned_integer (buf, 4, value);
 
-  return -1; // disables size checking in gdb
+  return 4;
 }
 
 static int
@@ -1893,9 +1893,9 @@ bfin_reg_store (SIM_CPU *cpu, int rn, unsigned char *buf, int len)
   else if (rn == SIM_BFIN_CC_REGNUM)
     SET_CCREG (value);
   else
-    return 0; // will be an error in gdb
+    return -1;
 
-  return -1; // disables size checking in gdb
+  return 4;
 }
 
 static sim_cia

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