About porting newlib to arm...

[Jeff Johnston]

Yen-Ting Chen wrote:
> Dear all,
> 
> Could anyone tell me what is the difference between these directories,
> and what I can make use of from these directories?
> 
> 1) newlib-<version>/libgloss/arm/
> 2) newlib-<version>/newlib/libc/machine/arm/
> 3) newlib-<version>/newlib/libc/sys/arm
> 
> If I want to port newlib to arm, should I modify
> newlib-<version>/newlib/libc/syscalls/*.c or just
> newlib-<version>/newlib/libc/sys/arm/syscalls.c ?
> And do I need to do with newlib-<version>/libgloss/arm ??
> 
> Thanks in advance.

Newlib is already ported to arm.  I assume that you want to port to a specific 
board.

You should be modifying libgloss/arm.  Syscall code should be placed in 
libgloss.  In the past, syscall code was sometimes placed in libc/sys, but this 
is historical and we are working to fix this.

Add your own .ld script etc.. to the libgloss/arm directory.  To properly avoid 
the use of the old default libc/sys/arm code, newlib must be configured with the 
  --disable-newlib-supplied-syscalls configuration option.

The end-user would then specify -T{your_ld_script} when compiling/linking.

-- Jeff J.