The pull request you sent on Mon, 12 Oct 2020 13:05:57 +0200:
> git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
> tags/x86_asm_for_v5.10
has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/029f56db6ac248769f2c260bfaf3c3c0e23e904c
Thank you!
--
Deet-doot-dot,
On Mon, Oct 12, 2020 at 10:57 PM Linus Torvalds
wrote:
>
> On Mon, Oct 12, 2020 at 1:22 PM Uros Bizjak wrote:
> >
> > No, this fact is not documented, although there are close to zero
> > chances it will ever change. High registers are independent from their
> > 8bit lowparts, but they still
On Mon, Oct 12, 2020 at 1:22 PM Uros Bizjak wrote:
>
> No, this fact is not documented, although there are close to zero
> chances it will ever change. High registers are independent from their
> 8bit lowparts, but they still clobber corresponding 16bit, 32bit and
> 64bit representations. I guess
On Mon, Oct 12, 2020 at 08:55:47PM +0200, Borislav Petkov wrote:
> On Mon, Oct 12, 2020 at 08:41:32PM +0200, Uros Bizjak wrote:
> > On Mon, Oct 12, 2020 at 8:11 PM Linus Torvalds <
> > torva...@linux-foundation.org> wrote:
> >
> > > On Mon, Oct 12, 2020 at 4:06 AM Borislav Petkov wrote:
> > > >
On Mon, Oct 12, 2020 at 11:11:35AM -0700, Linus Torvalds wrote:
> On Mon, Oct 12, 2020 at 4:06 AM Borislav Petkov wrote:
> >
> > * Use XORL instead of XORQ to avoid a REX prefix and save some bytes in
> > the .fixup section, by Uros Bizjak.
>
> I think this one is actually buggy.
>
> For the
On Mon, Oct 12, 2020 at 12:24 PM Uros Bizjak wrote:
>
> I don't think it is even possible to write to a part of a register in the
> asm. An example:
But this example is the *reverse* of what I worry about.
I worry about the asm writing not to a "part" of a register, but to
*more* than we told
On Mon, Oct 12, 2020 at 11:56 AM Linus Torvalds
wrote:
>
> I also find that clang generates code that uses the high byte
> registers, although again, that's not from any knowledge of clang
> internals, and just by looking at my kernel image disassembly.
>
> So yes, it _may_ all be just peepholes,
+ linux-toolcha...@vger.kernel.org for clang folks...
On Mon, Oct 12, 2020 at 11:56:45AM -0700, Linus Torvalds wrote:
> On Mon, Oct 12, 2020 at 11:41 AM Uros Bizjak wrote:
> >
> > GCC does not distinguish between %ah and %al and it is not possible to pass
> > "%ah" to the assembly. To access
On Mon, Oct 12, 2020 at 11:41 AM Uros Bizjak wrote:
>
> GCC does not distinguish between %ah and %al and it is not possible to pass
> "%ah" to the assembly. To access the high part of the %ax register, %h
> modifier has to be used in the assembly template.
Do you know whether that's true for
On Mon, Oct 12, 2020 at 08:41:32PM +0200, Uros Bizjak wrote:
> On Mon, Oct 12, 2020 at 8:11 PM Linus Torvalds <
> torva...@linux-foundation.org> wrote:
>
> > On Mon, Oct 12, 2020 at 4:06 AM Borislav Petkov wrote:
> > >
> > > * Use XORL instead of XORQ to avoid a REX prefix and save some bytes in
On Mon, Oct 12, 2020 at 4:06 AM Borislav Petkov wrote:
>
> * Use XORL instead of XORQ to avoid a REX prefix and save some bytes in
> the .fixup section, by Uros Bizjak.
I think this one is actually buggy.
For the 1-byte case, it does this:
__get_user_asm(x_u8__, ptr, retval, "b", "=q");
Hi Linus,
please pull two asm wrapper fixes.
Thx.
---
The following changes since commit f75aef392f869018f78cfedf3c320a6b3fcfda6b:
Linux 5.9-rc3 (2020-08-30 16:01:54 -0700)
are available in the Git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
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