QtSpim is a user interface built on the Qt UI framework for Spim, a self-contained simulator that runs MIPS32 programs.
QtSpim is a user interface built on the Qt UI framework for Spim, a self-contained simulator that runs MIPS32 programs.
Questions tagged [qtspim]
287 questions
5
votes
1 answer
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
- 97
- 1
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5
votes
1 answer
MIPS Assembly - Arrays?
I am absolutely brand new to assembly programming and am trying to implement the following function (in C) in MIPS:
int main()
{
int A[5]; // Empty memory region for 5 elements
int B[5] = {1,2,4,8,16};
int i;
for(i=0; i<5; i++) {
A[i] =…
Shannon
- 119
- 1
- 1
- 10
5
votes
3 answers
Instruction references undefined error in MIPS/QTSPIM
I am triying to count all characters in an array and i had the following error:
Instruction references undefined symbol at 0x00400014
[0x00400014] 0x0c000000 jal 0x00000000 [main] ; 188: jal main
.data
string: .asciiz "nice…
piyuyo
- 73
- 1
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4
votes
1 answer
string length for mips assembly
Whenever I run the following code:
#counts length of a string
.data
.data
string: .asciiz "Hello"
printedMessage: .asciiz "The length of the string: "
.text
main:
la $a0, string # Load address of string.
jal strlen …
MCsuchNsuch
- 256
- 2
- 5
- 17
3
votes
2 answers
Is "jr $ra" required to end a MIPS assembly language program? (MARS & QtSpim behave differently!)
If you put a jr $ra at the end of a MIPS assembly language program in MARS, you will get an error message saying:
invalid program counter value: 0x00000000
Example 1 below fails:
.data
theMsg: .asciiz "Hello World\n"
.text
.globl main
main: …
Chris
- 43
- 5
3
votes
1 answer
I get the error MIPS “spim: (parser) syntax error” when running the code
I'm using a MIPS simulator.
Occurs that when I'm trying to open the text file that contains my code in the simulator
I am having trouble understanding why this will not run on QTSpim. I get the error
spim: (parser) syntax error line 8
Code:
#This…
bobbyjon
- 31
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- 2
3
votes
1 answer
QtSpim cuts the 2 initial chars after string reading
I've tried with both QtSpim 9.1.16 and 9.1.17, all of them "cut" the first 2 chars of an input string, setting them to 0x0, other ASCII chars are correctly saved into buffer. That's my snippet, even though other code I've found on the internet…
LivingSilver94
- 125
- 8
3
votes
2 answers
Trouble sign extending a register in MIPS
Currently I have
lh $t1, 0($t1)
for sign extending $t1 from 16 bit to 32 bits, but this doesn't work. Is there a simple way to sign extend registers in MIPS?
JR3652
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- 13
3
votes
2 answers
When working with QtSpim, where do I see the program output and where can I input values?
I have code that I know works (it was from my professor) but I don't really understand where I 'm supposed to see the program output. I see the registers changing and such (not that I follow it completely) but the program is supposed to ask the user…
pearbear
- 1,025
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2
votes
1 answer
Attempting to convert the following C Code to High Level MIPS Assembly code but no output, why?
I have already tried changing the adding more space to the stack and that didn't seem to help ro change anything also in the uppercase label function I initially had the register names as $s4, $s5, $s6 which I change to $s0, $s1, and $s2…
RiskyGadget4Life
- 25
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2
votes
0 answers
GCC porting to new target using software floating point library
I am currently trying to porting GCC-9.2.0 compiler for new architecture "SPIM" which is similar to MIPS architecture, using floating point arithmetic operation by GCC internal: 4.2 Routines for floating point emulation ([https://reurl.cc/Q3Y1jM])…
Lino Peng
- 21
- 3
2
votes
0 answers
Run MIPS program in command line without opening QTSPIM
I want to execute a program purely through terminal without having to open QTSPIM and running the program through the GUI. Is there a way around this? I have been using SPIM for this purpose but it's outdated and has some really annoying bugs that…
Danny
- 244
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2
votes
1 answer
MIPS Multiplication of More Than 32 Bits
For an assignment, I need to develop a recursive algorithm were given an input string I print out the unsigned decimal integer corresponding to the base-30
number represented by the string. (a-10;b-11;...) For example:
Given input:…
JabariD
- 23
- 5
2
votes
0 answers
why jal main error (jal 0x00000000 [main])
When I run this code,There is an error in the main and it does not operate normally.
I changed the main function or thought there was a problem with the main and global main, so I repeated the correction several times.
.data
message: .asciiz "…
나우정
- 21
- 1
2
votes
2 answers
MIPS: Division algorithm (Dividing significands of IEEE-754 format) gives incorrect answer for the last 4-5 bits (LSB)
For the case where divisor>dividend, the calculated mantissa gives wrong result for the last 4-5 least significant bits.
I'm trying to divide the significands/mantissa of two IEEE-754 floating point numbers. I've used this division algorithm
When…
Husun
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