14 questions from the last 30 days
1
vote
2
answers
151
views
How exactly does recursion work in x86 assembly?
My question is focused specifically on assembly (intel). In C for example, recursion can be done with a simple return command but in assembly I feel like there's a lot more things going on, especially ...
- 111
Advice
0
votes
2
replies
87
views
Determine used micro architecture level in executable linkable format (ELF) on x86
I have some troubles with prebuilt development tools (compiler, linker, ...) on my very old workstation. Because the CPU from my old system only supports the micro architecture level x86-64-v1 it ...
5
votes
1
answer
77
views
write(2) syscall returns EFAULT for string in .rodata on OpenBSD 7.3--7.8
I'm writing a hello-world program in i386 assembly for OpenBSD 7.8. The program works if the string (buf argument of write(2)) is in .data or on the stack, but write(2) returns EFAULT (== 14) if the ...
- 88.7k
3
votes
0
answers
150
views
The cost of non contiguous reads and writes (naive matrix transpose, power-of-2 and other sizes)
I was benchmarking a naive transposition and noticed a very large performance discrepancy in performance between:
a naive operation where we read data contiguously and write with a large stride;
the ...
- 715
1
vote
1
answer
101
views
Trouble setting up Interrupts in custom Assembly based Kernel
I am working on an assembly kernel, using the OSDev Wiki and a PDF from Nick Blundell. I have set up my GDT and it seems to work fine. I am also able to load the IDTR as well. However, when I try to ...
- 35
2
votes
2
answers
142
views
Location of the first value pushed onto stack in assembly (x86 I386 assembly) (gdb) (AT&T)
Consider the assembly program below:
.section .data
.section .text
.global _start
_start:
pushl $85 #make it obvious in memory
popl %ebx
movl $1, %eax
int $0x80
It ...
- 25
1
vote
0
answers
68
views
.NET 9 x86 interop BadImageFormatException on Azure VM but works fine locally
I have a .NET 9 console app built for x86:
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net9.0</TargetFramework>
<PlatformTarget>x86<...
- 114