[Qemu-devel] [PATCH] mips/gdbstub: Make CP1.FIR read-only here too

[Maciej W. Rozycki]

CP1.FIR is read-only in hardware so gdbstub must respect it.  We already 
respect it for CTC1 instructions, so do it here too.

Signed-off-by: Maciej W. Rozycki <ma...@codesourcery.com>
---
Not much to say about it here.  Please apply.

  Maciej

qemu-mips-fir.diff
Index: qemu-git-trunk/target-mips/gdbstub.c
===================================================================
--- qemu-git-trunk.orig/target-mips/gdbstub.c   2014-11-02 17:51:33.458968203 
+0000
+++ qemu-git-trunk/target-mips/gdbstub.c        2014-11-02 17:51:35.958924223 
+0000
@@ -112,7 +112,7 @@ int mips_cpu_gdb_write_register(CPUState
             RESTORE_ROUNDING_MODE;
             break;
         case 71:
-            env->active_fpu.fcr0 = tmp;
+            /* FIR is read-only.  Ignore writes.  */
             break;
         }
         return sizeof(target_ulong);