Re: [PATCH 1/2] x86: entry_64.S: always allocate complete "struct pt_regs"

From: Denys Vlasenko
Date: Thu Feb 12 2015 - 16:53:54 EST

On Thu, Feb 12, 2015 at 6:17 PM, Borislav Petkov <bp@xxxxxxxxx> wrote:
> On Wed, Feb 11, 2015 at 10:55:52PM +0100, Denys Vlasenko wrote:
>> Macros which manipulate "struct pt_regs" on stack are reworked:
>> ALLOC_PT_GPREGS_ON_STACK allocates the structure.
>> SAVE_C_REGS saves to it those registers which are clobbered by C code.
>> SAVE_EXTRA_REGS saves to it all other registers.
>> Corresponding RESTORE_* and REMOVE_PT_GPREGS_FROM_STACK macros reverse it.
> You'd need to redo that patch against latest upstream because of changes
> it is missing:
> Andy's branch x86/entry should have them too:
> arch/x86/kernel/entry_64.S: Assembler messages:
> arch/x86/kernel/entry_64.S:760: Error: no such instruction: `restore_args 1,8,1'
> make[2]: *** [arch/x86/kernel/entry_64.o] Error 1
> make[1]: *** [arch/x86/kernel] Error 2
> make[1]: *** Waiting for unfinished jobs....
> make: *** [arch/x86] Error 2
> make: *** Waiting for unfinished jobs....

The renaming of macros caught the bug at compile time, as intended.

I'll send an updated patch set v3 in a minute. It will have
additional patch in front, since that location in code
also wrongly uses R11 instead of ARGOFFSET.
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