That's a 64-bit add, which is actually being used as a 64-bit move of the "sp" register to k1. Try "objdump -m mips:isa64" (or whatever variant gives your version of objdump the right to disassemble the MIPS III+/MIPS64 instructions. One might suspect that your board monitor ROM was built for a 64-bit CPU. This illustrates why, if one want to write portable assembler code for MIPS, one should implement "move" operations as OR Target,$0,Source rather than using an ADDU or DADDU... ----- Original Message ----- From: "Dmitriy Tochansky" <toch@xxxxxxxxx> To: <linux-mips@xxxxxxxxxxxxxx> Sent: Thursday, October 14, 2004 13:53 Subject: Strange instruction > Hello! > > When starts kernel for my au1500 board reseting board. After disassembling I found instruction > which reseting board. Here is few strings of "mipsel-linux-objdump -D vmlinux" output: > > --- > > a0000650: 07400003 bltz k0,a0000660 <nmi_handler+0x1c> > a0000654: 03a0d82d 0x3a0d82d > a0000658: 3c1ba020 lui k1,0xa020 > > --- > > Base address changed by me. > > What is A0000654? There is board resets. > >
