This patch (and the one that got checked in for gdb-snapshot) hack the opcodes such that the MIPS32r2 instruction 'rdhwr' actually appears in the list of MIPS I instructions. This allows us to get disassembly for non-MIPS32r2 binaries.

toolchain/binutils/2.16.1/400-mips32r2-rdhwr-disassemble-hack.patch

@@ -0,0 +1,12 @@
+diff -ur binutils-2.16.1/opcodes/mips-opc.c binutils-2.16.1-patched/opcodes/mips-opc.c
+--- binutils-2.16.1/opcodes/mips-opc.c	2005-03-03 05:49:50.000000000 -0600
++++ binutils-2.16.1-patched/opcodes/mips-opc.c	2005-08-29 18:17:40.000000000 -0500
+@@ -923,7 +923,7 @@
+ {"remu",    "z,s,t",    0x0000001b, 0xfc00ffff, RD_s|RD_t|WR_HILO,      0,		I1	},
+ {"remu",    "d,v,t",	0,    (int) M_REMU_3,	INSN_MACRO,		0,		I1	},
+ {"remu",    "d,v,I",	0,    (int) M_REMU_3I,	INSN_MACRO,		0,		I1	},
+-{"rdhwr",   "t,K",	0x7c00003b, 0xffe007ff, WR_t,			0,		I33	},
++{"rdhwr",   "t,K",	0x7c00003b, 0xffe007ff, WR_t,			0,		I33|I1	},
+ {"rdpgpr",  "d,w",	0x41400000, 0xffe007ff, WR_d,			0,		I33	},
+ {"rfe",     "",		0x42000010, 0xffffffff,	0,			0,		I1|T3	},
+ {"rnas.qh", "X,Q",	0x78200025, 0xfc20f83f,	WR_D|RD_T|FP_D,		RD_MACC,	MX	},