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);