"Thomas Epperson" <epperson@xxxxxxxxxxxxxxxxxx> writes: > I am working on a cross-compiler for gcc for a system (os) I am > creating. Everything is fine, except for the fact that initialization > routines (_init and others related to it) just don't work. I have > followed the guide here (http://wiki.osdev.org/OS_Specific_Toolchain) > and I am using newlib. I am looking for some guidance to get the > initialization routines working. > I have tried adding crti.o and crtn.o to extra_parts, but have had no > luck with that. I tried looking at other parts that had init routines > (like rtems), but I couldn't make sense of them. > I also read http://developer.apple.com/documentation/DeveloperTools/gcc-4.0.1/gccint/Initialization.html > This helped out some, but still confused me. Your startup code has to run the initialization routines. Basically, when using ELF, it has to call _init before calling main. On GNU/Linux, the startup code, written in assembler, will call __libc_start_main, and pass it the address of __libc_csu_init. The latter function will call _init. This is all part of glibc. Ian
