Can I declare myself section in assembly source code and ld script?

Question

I know

• In assembly language source code, I can use directives .text, .data, or .rodata to declare sections.
• In linker script, I can use following commands to generate sections into ELF file

.text : { *(.text) }
.data : { *(.data) }

• If using readelf, I can see sections .text, .data, etc.

My questions are:

• Can I add a custom section .mysection to ELF by asm code and ld script?
• If I add custom section and build project as a shared library, can linux dynamic linker/loader deal with my shared lib correctly? Or I have to modify dyn-linker/loader?

Appreciate any suggesions.

Answer 1

I am summarizing the comments from @Jester @Ross Ridge on question for reference

Yes you can add customize section (with out changing the kernel dynamic loader as it will determine the sections from the ELF headers) you should use .section directive to avoid the error "reset.S: Assembler messages: reset.S:8: Error: unknown pseudo-op: `.mysection".