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Questions tagged [mips32]

Use this tag for questions related to the 32 bits version of the MIPS architecture instruction set. See also [tag:MIPS].

632 questions
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How does the $fp and $sp register work in MIPS?

I am currently reading Computer Organization and Design by John L. Henessy for Architecture course. As far as I understood that $sp points to the most recently allocated address in the stack and $fp points to the begining of the stack. Why exactly…
cnoob
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How to implement NOT operation in MIPS?

I am new in MIPS, and I am trying to judge whether each char in a string is an alpha. I used the ASCII code to help me to judge it, while I found there is no instruction representing larger than meaning. So I try to implement a not operation from…
jianjieluo
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MIPS Assembly Alignment Align n

What does the directive .align n do in an array? To be more specific let's say that I have the following part of code: array: .align 2 .space 800 What's its importance and why not just skip it and use .space 800 This is a…
Konstantinos T. Pantelis
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Why does the MIPS stack pointer need to be kept double word aligned?

I have read this in a couple of places, but without fully understanding why. I understand why all instructions have to be word aligned to 4 bytes in MIPS32. But then I read that a stack frame needs to be a multiple of 8, because the stack pointer…
Nadim Hussami
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mmap return EINVAL when run with Valgrind

My mips32 application run against Valgrind fails in mmap function. It works fine if I run separately but when I run it against valgrind it fails with EINVAL each time. void * mem = (uint32_t *)mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED,…
user4117880
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How to perform 64-bit addition and subtraction using MIPS?

I want to perform 64-bit addition and subtraction: v1v0(HiLo) = a1a0 + a3a2 using MIPS assembly language (a1a0(HiLo) is the first 64-bit number consists of two 32-bit numbers, and a3a2(HiLo) is the second) and I have: $a0 = 0xffffffff $a1 = 0x0 $a2…
Meteorite
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Getting result from mult in mips

I am new to assembly language, and I am really confused over multiplying. I was reading the quick tutorial here (dead link, web archive here) It says after I use mult $t0, $t1 the results are stored in Hi and Lo, I understand these are special…
Nick
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Difference between Syscall and Traps

I am wondering if there is any difference between the MIPS syscall and trap instructions. I can't find anything involving this, so I am not sure if there is a difference. Traps seem to just be a conditional syscall, but some clarifying can be…
Alex
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How far can the j(jump) instruction jump in memory? (MIPS)

Consider the j(jump) instruction in MIPS. How far can it jump in memory? Would it be 32bits? Can i please have an explanation.
user977154
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Why can I not use li.s in MARS?

I cannot use li.s in MARS. I am new to MIPS programming and I am trying not to use any co processors. Why can I not use li.s is MARS the program? It would be very helpful is someone could lead me in a new direction!
user1026822
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implementing a processor ( mips single cycle )

i have a mini project , in this project i need to implement a MIPS single cycle processor by Verilog. here I write the ALU and ALUControl and FileRegister but i have a problem to implement the Pc ( program counter ) for this ... i want this Pc…
Rojin
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How many instructions need to be killed on a miss-predict in a 6-stage scalar or superscalar MIPS?

I am working on a pipeline with 6 stages: F D I X0 X1 W. I am asked how many instructions need to be killed when a branch miss-predict happens. I have come up with 4. I think this because the branch resolution happens in X1 and we will need to kill…
Corith
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C++ running on PIC32 (MIPS32)

Unfortunately, my C app for PIC32 needs OO too much and I can't continue doing it in C. Do you know any MIPS32 C++ compiler for PIC32? Thanks
rnunes
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Building a small Go program for MIPS with no hardware floating point (softfloat required)

I have small program written in go that I'm trying to cross compile to get working on a MIPS architecture machine. I've been trying to cross compile using the XGO cross compilation library but have had limited success getting my program to run…
MattLock
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MIPS32 router: module_init not called for kernel module

I'm developing a kernel module that I want to run on my router. The router model is DGN2200v2 by Netgear. It's running Linux 2.6.30 on MIPS. My problem is that when I load my module it seems that my module_init isn't getting called. I tried to…
YSK
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