gcc cross compiler for "powerpc-eabi"(with out OS)

[Kai Ruottu]

4.5.2011 12:36, Thulasi Ramu J kirjoitti:

> We want to use GCC for compiling code to a board based on MPC8260
> processor.
> The code consists of C and assembly languages to initialize processor
> and test
> the interfaces in the board. There will not be any OS on the board.
> We have done the following by selecting target=powerpc-eabi option.
> 1) Build binutils (binutils-2.21)
> 2) Build bootstrap gcc (gcc-4.4.1)
> 3) Build newlib (newlib-1.19.0)
> 4) Build full gcc
>
> But, we are stuck with implementing __eabi(), __init() and __fini()
> functions.

They are in the '*crt*.o' startups and the 'libgcc.a' GCC-helper
library produced during the GCC build and installed as essential
parts of the produced GCC...

> Normally we do the following
> 1. initilize MPC8260 registers (including r1,Stack pointer)
> 2. Intialize Memory controller and SIU
> 3. Finally we call main( in C code)
>
> 1. We would like to know what is done in __eabi() function which is
> included in the main() by default by the compiler as I was getting
> undefined reference to __eabi in main function.

The GCC sources, 'gcc-4.4.1/gcc/config/rs6000/eabi.asm', should tell
this...

> 2. What is the function of __init() in generally which is called by
> __eabi() function?

Again, the GCC sources, should tell this. Where, will be left as
homework... The clues are using 'grep' and expecting all the CPU-
dependent config stuff being in the same directory...

> 3. Similarly, how to implement these functions for my target ? Any
> documents or any clues..

I don't think you needing to reinvent the wheel with these...