oddcoder
cc305fc574
At least in linux kernel, assuming that a.out is an elf that is linked against relibc's own ld.so. When a user attempts `./a.out`, Linux kernel will map `./a.out`, then map `ld.so` and jump into ld.so entry point. In relibc ld.so will simply ignore the kernel mapped a.out and create its own mapping. This patch forces relic ld.so to use the already mapped `a.out` when ever possible. This would normally have slight performance improvement (especially that currently relibc doesn't map a.out but instead copy the data into empty mmaped memory). The real motivation behind this patch is while impelemnting Runtime linker debugging protocol for relibc. part of the protocol is ld.so inseting address of some ld.so managed data structure into .dynamic seciton of a.out then the debugger would check it there. The thing is that debuggers have information about the kernel loaded ./a.out and they check that one specifically which is in our case totally ignored by relibc.
relibc 
relibc is a portable POSIX C standard library written in Rust. It is under heavy development, and currently supports Redox and Linux.
The motivation for this project is twofold: Reduce issues the redox crew was having with newlib, and create a safer alternative to a C standard library written in C. It is mainly designed to be used under redox, as an alternative to newlib, but it also supports linux syscalls via the sc crate.
Contributing
Supported OSes
- Redox OS
- Linux
Supported architectures
- x86_64
- Aarch64