[edk2-devel] [PATCH v2 3/5] MdePkg/BaseLib: use normal register init in ARM SetJump implementations

[Leif Lindholm]

On Mon, Oct 02, 2023 at 20:00:21 +0200, Philippe Mathieu-Daudé wrote:
> Hi Leif,
> 
> On 26/9/23 19:15, Leif Lindholm wrote:
> > There may be architectures on which there are benefits to
> >    eor r0, r0(, r0)
> > but ARM was never one of them. Change to more readable
> >    mov r0, #0
> > instead.
> > 
> > Signed-off-by: Leif Lindholm <quic_llindhol at quicinc.com>
> > Cc: Ard Biesheuvel <ardb+tianocore at kernel.org>
> > Cc: Sami Mujawar <sami.mujawar at arm.com>
> > ---
> >   MdePkg/Library/BaseLib/Arm/SetJumpLongJump.S   | 2 +-
> >   MdePkg/Library/BaseLib/Arm/SetJumpLongJump.asm | 2 +-
> >   2 files changed, 2 insertions(+), 2 deletions(-)
> 
> 
> > diff --git a/MdePkg/Library/BaseLib/Arm/SetJumpLongJump.asm b/MdePkg/Library/BaseLib/Arm/SetJumpLongJump.asm
> > index e1eff758f7ab..ef02d85e0e66 100644
> > --- a/MdePkg/Library/BaseLib/Arm/SetJumpLongJump.asm
> > +++ b/MdePkg/Library/BaseLib/Arm/SetJumpLongJump.asm
> > @@ -33,7 +33,7 @@
> >   SetJump
> >     MOV  R3, R13
> >     STM  R0, {R3-R12,R14}
> > -  EOR  R0, R0
> > +  MOV  RO, #0
> 
> Hmm. s/RO/R0/ ?

Hmm, what?
I know for a fact I spotted that while importing the v1, and fixed it.
No idea how I managed to unfix it.

Too late, already got merged. Sent a fix out.

Hmm ... I think this says something about non-gcc/clang support for
(32-bit) Arm. Are we getting to the point where we might want to
retire it?

Thanks!

/
    Leif

> >     BX   LR
> >   ;/**
> 


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