[PATCH v1] Add Loongson2F specific NOP instruction

[Wu Zhangjin]

I'm sorry, "addu v0,zero,v0" may make kernel hang at "ld      a0,0(v0)",
I need to change it be something else.

Regards,
	Wu Zhangjin

On Fri, 2009-11-13 at 17:02 +0800, Wu Zhangjin wrote:
> This is a patch to work around a possible cpu pipeline issue. Without this,
> under extreme cases, cpu might deadlock.(e.g. some have seen this with binutils
> 2.18, ld dies when compiling)
> 
> The changed instruction has no real effect since it does nothing except
> an extra writing operation, which is the key to prevent issue. The issue
> has been solved in latest processor batches.
> 
> 2009-11-13  Wu Zhangjin  <wuzhangjin@gmail.com>
> 
>         * mips-opc.c (mips_builtin_opcodes): Add NOP instruction for
>         Lemote Loongson 2F.
> 
> diff --git a/opcodes/mips-opc.c b/opcodes/mips-opc.c
> index caeef72..c430b02 100644
> --- a/opcodes/mips-opc.c
> +++ b/opcodes/mips-opc.c
> @@ -187,6 +187,7 @@ const struct mips_opcode mips_builtin_opcodes[] =
>  /* name,    args,	match,	    mask,	pinfo,          	pinfo2,		membership */
>  {"pref",    "k,o(b)",   0xcc000000, 0xfc000000, RD_b,           	0,		I4_32|G3	},
>  {"prefx",   "h,t(b)",	0x4c00000f, 0xfc0007ff, RD_b|RD_t|FP_S,		0,		I4_33	},
> +{"nop",     "",         0x00021021, 0xffffffff, 0,              	INSN2_ALIAS,	IL2F    }, /* addu v0,zero,v0 */
>  {"nop",     "",         0x00000000, 0xffffffff, 0,              	INSN2_ALIAS,	I1      }, /* sll */
>  {"ssnop",   "",         0x00000040, 0xffffffff, 0,              	INSN2_ALIAS,	I32|N55	}, /* sll */
>  {"ehb",     "",         0x000000c0, 0xffffffff, 0,              	INSN2_ALIAS,	I33	}, /* sll */