[RFC][PATCH 2/4] checkpoint/restart: x86 support

Jeremy Fitzhardinge jeremy at goop.org
Sun Aug 10 07:55:26 PDT 2008

Dave Hansen wrote:
> On Fri, 2008-08-08 at 19:04 -0400, Oren Laadan wrote:
>>> struct pt_regs is part of the kernel ABI, it will not change.
>> I'm in favor about keeping the format identical between the variations of
>> each architecture. Note, however, that "struct pt_regs" won't do because it
>> may change with these variations.
> "Part of the kernel ABI" makes it sound to me like it won't change.
> Who's right here? :)

Struct pt_regs is not ABI, and can (and has) changed on x86.   It's not 
suitable for a checkpoint structure because it only contains the 
registers that the kernel trashes, not all usermode registers (on i386, 
it leaves out %gs, for example).  asm-x86/ptrace-abi.h does define stuff 
that's fixed in stone; it expresses it in terms of a register array, 
with constants defining what element is which register.


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