Re: Changes required for x86 address spaces

On 10/21/2015 06:47 PM, Richard Henderson wrote:

> I was thinking the same thing.  Presumably all one needs to do is define new 
> architecture registers and fill in the blanks.  But I've lost track of how to 
> do that these days; it seems to be scattered across 19 different files...

Yeah, on x86-64, fs_base and fs_base are available in user_regs_struct
nowadays, thus accessible with PTRACE_PEEKUSER and PTRACE_GETREGSET.

Basically you need to:

 - add new gdb register numbers to amd64-tdep.h
 - add the ptrace/gdb register mapping to amd64-linux-tdep.c:amd64_linux_gregset_reg_offset
 - add new xml files to gdb/features/i386/
 - make gdb/x86-linux-nat.c:x86_linux_read_description return the new description.

Thanks,
Pedro Alves