5,911 questions
1
vote
1
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70
views
Failure to enumerate USB device with DWC2 USB host
I am working on an embedded RTOS system for a 32-bit MIPS SOC, which supports DWC2 OTG. (It can run Linux well.)
I ported an open-source USB stack to this system by following the porting guidance.
...
- 1,317
1
vote
0
answers
52
views
Using objdump to produce gas-compatible assembly?
I have an ELF file (more specifically, a 32-bit MIPS-III statically linked one). The code in it starts with something like:
entry:
00100008 28 0c 00 70 clear at
0010000c 28 14 00 70 clear ...
2
votes
2
answers
152
views
LLVM's Libunwind Registers_mips_o32.jumpto returns to the wrong place
In my project, I have written my own implementation of the higher levels of the Itanium abi (__cxa_throw, etc). However, when it came to stack unwinding, I decided that this would be too much for me ...
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-3
votes
1
answer
116
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Understanding when a hazard in MIPS occurs
I have a question regarding these two instructions:
lw r2, 10(r1)
lw r1, 10(r2)
Is there a hazard here, do I need stalls in between two of them?
I want to know if any kind of hazard happens here? I ...
- 17
0
votes
0
answers
57
views
How does jr $ra keep causing infinite loops?
I'm doing homework, where the product of the numbers between two points (first and last) in an array is meant to be placed in register $v0. All the autotest results from github I have been able to get ...
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-3
votes
1
answer
113
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How can I create a loop using assembly language
I'm currently learning MIPS assembly and trying to understand how to create loops. I understand basic instructions like add, sub, and li, but I'm not sure how to implement a loop structure similar to ...
0
votes
0
answers
26
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I get the error MIPS: 'spim: syntax error on line 9 addi x10, x0, 0'
New to mips, so some of the text or formatting is from the professors instructions.
Trying to translate the following C-Code into Mips Assembly language using Qtspim and Notepad
a=0
for(i=0;i<10;i++...
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1
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1
answer
195
views
Understanding the endianness of MIPS. Why is data being stored in little endian format but output looks big endian
This MIPS assembly program shown below is meant to count the number of characters in a string. This program was written using the MARS MIPS simulator (available from https://dpetersanderson.github.io/...
- 14.9k
0
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0
answers
63
views
MIPS - How to find the immediate value/branch offset from the bne instructions?
slt $t2, $t5, $t0 <---- 0x04001248 (PC) [Memory Address]
bne $t2, $s4, ELSE
lw $s4, 120($s1)
j DONE
ELSE: addi $t2, $t2, -100
DONE: nop
Assume this is the example. What ...
0
votes
2
answers
45
views
MIPS. 1 NOR 1 == -2?
I am trying to implement logical not in MIPS. I have read several suggestions that I implement it by nor $T1, $T1, $T1 or nor $T1, $T1, $0.
The spec seems to support this working, but when I nor 1 ...
- 249
2
votes
0
answers
95
views
Why is this assembly For loop not working?
.data
li $s0, 4 #upper limit
li $s1, 0 #counter
.text
main:
bgt $s1, $s0, end # Branch to 'end' if $s1 = $s0
move $a0, $s1 # Move the value of $s0 to $a0 (argument ...
- 21
2
votes
1
answer
106
views
Unconditional branch behaviour in no-taken branch prediction
I have the following code in nanoMips:
loop: lw $t1, A($t0)
lw $t2, B($t0)
sub $t3, $t1, $t2
beq $t3, $r0, else
sw $t2, A($t0)
b end
The exercise asks me to implement the no-taken branch prediction ...
- 21
0
votes
1
answer
170
views
Issue during flash programming in lauterbach tool
I have a MIPS based broadcom chip BCM68380 which I am trying to program by following cmm script.
SYSTEM.RESET
SYSTEM.CPU bcm63268
SYSTEM.OPTION ResBreak OFF
SYSTEM.OPTION IMASKASM ON
SYSTEM.OPTION ...
0
votes
0
answers
29
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Where could I find various machine architectures spec used by GCC? e.g. MIPS
I'm new to GCC and can't find the exact spec where its implementation is based.
If my target machine's ISA is MIPS architecture, how could I find the MIPS spec which the GCC implementation is based on?...
1
vote
1
answer
121
views
Unexpected results on testing MIPS memory access with SIMD
I am working on an embedded Linux system (kernel-5.10.24) on a MIPS CPU, and now I am learning and test MIPS SIMD.
I wrote a simple test to compare performance of normal functions like memcpy,memset ...
- 1,317