Re: [edk2-devel] [PATCH 1/1] ArmPkg/CompilerIntrinsicsLib: provide __ashlti3

["Jeff Brasen via groups.io" <jbrasen=nvidia.com@groups.io>]

I needed this when I updated the OpenSSL on our builds to 3.0.12 to resolve some CVEs.


> -----Original Message-----
> From: Ard Biesheuvel <ardb@kernel.org>
> Sent: Friday, February 2, 2024 10:27 AM
> To: Jeff Brasen <jbrasen@nvidia.com>
> Cc: devel@edk2.groups.io; ardb+tianocore@kernel.org;
> quic_llindhol@quicinc.com; sami.mujawar@arm.com
> Subject: Re: [PATCH 1/1] ArmPkg/CompilerIntrinsicsLib: provide __ashlti3
> 
> External email: Use caution opening links or attachments
> 
> 
> On Thu, 1 Feb 2024 at 03:05, Jeff Brasen <jbrasen@nvidia.com> wrote:
> >
> > The compiler will use this function if it is left shifting a 128 bit
> > value.
> >
> > Signed-off-by: Jeff Brasen <jbrasen@nvidia.com>
> 
> UEFI does not define any 128 bit types, right? How do you end up needing
> this?
> 
> 
> > ---
> >  .../CompilerIntrinsicsLib.inf                 |  1 +
> >  .../CompilerIntrinsicsLib/AArch64/ashlti3.S   | 33 +++++++++++++++++++
> >  2 files changed, 34 insertions(+)
> >  create mode 100644
> > ArmPkg/Library/CompilerIntrinsicsLib/AArch64/ashlti3.S
> >
> > diff --git
> > a/ArmPkg/Library/CompilerIntrinsicsLib/CompilerIntrinsicsLib.inf
> > b/ArmPkg/Library/CompilerIntrinsicsLib/CompilerIntrinsicsLib.inf
> > index 7e22e6f67bff..054e68130730 100644
> > --- a/ArmPkg/Library/CompilerIntrinsicsLib/CompilerIntrinsicsLib.inf
> > +++ b/ArmPkg/Library/CompilerIntrinsicsLib/CompilerIntrinsicsLib.inf
> > @@ -66,6 +66,7 @@ [Sources.ARM]
> >
> >  [Sources.AARCH64]
> >    AArch64/Atomics.S    | GCC
> > +  AArch64/ashlti3.S    | GCC
> >
> >  [Packages]
> >    MdePkg/MdePkg.dec
> > diff --git a/ArmPkg/Library/CompilerIntrinsicsLib/AArch64/ashlti3.S
> > b/ArmPkg/Library/CompilerIntrinsicsLib/AArch64/ashlti3.S
> > new file mode 100644
> > index 000000000000..79a7b3514c57
> > --- /dev/null
> > +++ b/ArmPkg/Library/CompilerIntrinsicsLib/AArch64/ashlti3.S
> > @@ -0,0 +1,33 @@
> > +#--------------------------------------------------------------------
> > +----------
> > +#
> > +# Copyright (c) 2024 NVIDIA CORPORATION & AFFILIATES. All rights
> reserved.
> > +#
> > +# SPDX-License-Identifier: BSD-2-Clause-Patent #
> > +#--------------------------------------------------------------------
> > +----------
> > +
> > +#include <AsmMacroIoLib.h>
> > +
> > +ASM_FUNC(__ashlti3)
> > +  # return if shift is 0
> > +  cbz x2, 1f
> > +
> > +  mov x3, #64
> > +  sub x3, x3, x2
> > +  cmp x3, #0
> > +  b.le 2f
> > +
> > +  # shift is <= 64 bits
> > +  lsr x3, x0, x3
> > +  lsl x1, x1, x2
> > +  orr x1, x1, x3
> > +  lsl x0, x0, x2
> > +1:
> > +  ret
> > +
> > +2:
> > +  # shift is > 64
> > +  neg w3, w3
> > +  lsl x1, x0, x3
> > +  mov x0, #0
> > +  ret
> > --
> > 2.34.1
> >


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