From: Maciej W. Rozycki <macro@codesourcery.com>
Date: Mon, 3 Nov 2014 18:51:38 +0000 (+0000)
Subject: target-mips: Make CP1.FIR read-only here too
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=c7d4d98ae7057467f48c02a11ad9120021976089;p=qemu.git

target-mips: Make CP1.FIR read-only here too

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 <macro@codesourcery.com>
Reviewed-by: Leon Alrae <leon.alrae@imgtec.com>
Signed-off-by: Leon Alrae <leon.alrae@imgtec.com>
---

diff --git a/target-mips/gdbstub.c b/target-mips/gdbstub.c
index 7e3a604afa..e86df0e57c 100644
--- a/target-mips/gdbstub.c
+++ b/target-mips/gdbstub.c
@@ -105,7 +105,7 @@ int mips_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
             RESTORE_ROUNDING_MODE;
             break;
         case 71:
-            env->active_fpu.fcr0 = tmp;
+            /* FIR is read-only.  Ignore writes.  */
             break;
         }
         return sizeof(target_ulong);