this post was submitted on 28 May 2025
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Python needs an actual default function (europe.pub)
submitted 3 weeks ago by HiddenLayer555@lemmy.ml to c/programmer_humor@programming.dev
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Also, do y'all call main() in the if block or do you just put the code you want to run in the if block?

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[โ€“] barsoap@lemm.ee 1 points 3 weeks ago* (last edited 3 weeks ago) (1 children)

~~Your ld.so contains:~~

~~Entry point address: 0x1d780~~

EDIT: ...with which I meant, modulo brainfart: My libc.so.6 contains a proper entry address, while other libraries are pointing at 0x0 and coredump when executed. libc.so is a linker script, presumably because GNU compulsively overcomplicates everything.

...I guess that's enough for the kernel. It might be a linux-only thing, maybe even unintended and well linux doesn't break userspace.

Speaking of, I was playing it a bit fast and loose: _start is merely the default symbol name for the entry label, I'm sure nasm and/or ld have ways to set it to something different.

[โ€“] JATtho@lemmy.world 1 points 3 weeks ago* (last edited 3 weeks ago)

Btw, ld.so is a symlink to ld-linux-x86-64.so.2 at least on my system. It is an statically linked executable. The ld.so is, in simpler words, an interpreter for the ELF format and you can run it:

ld.so --help

Entry point address: 0x1d780

Which seems to be contained in the only executable ~~section~~ segment of ld.so

LOAD 0x0000000000001000 0x0000000000001000 0x0000000000001000
     0x0000000000028bb5 0x0000000000028bb5  R E    0x1000

Edit: My understanding of this quite shallow; the above is a segment that in this case contains the entirety of the .text section.