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...
