Locate a function from ELF executible file

In a rather obscure use case, instead of loading the whole ELF executible file into memory, I'd like to load only the part of ELF file that contains a particular function. The difficulty I am facing is: I don't know how to locate where the code of this particular function is in the ELF file. If I had this piece of information, I would use it to load the disk sector(s) containing this part of ELF file into memory, and jump to it. But, being not very familiar with ELF file format and how ld works, I don't know how to get this piece of information. All the information I know is the function name (Just C function, no overload). Or, is this possible to find out the position of a function from headers of ELF file at all?

I would greatly appreciate it if you could give me some help to locate a particular function in ELF executible file. It would be perfect if I can know both its starting and ending position, but only the starting position is also fine. A reference to some reading materials towards this goal (if technically feasible at all) for self-study is also ok. The platform I am working on is Linux 20.04 with GNU development toolchain (the version of ld is 2.34) on x86 CPU (the ELF format is elf32−i386). Thank you.

https://stackoverflow.com/questions/66897183/locate-a-function-from-elf-executible-file April 01, 2021 at 09:05AM