On Tue, Oct 15, 2019 at 04:02:47AM +0000, Chang, Abner (HPS SW/FW Technologist) 
wrote:
> > -----Original Message-----
> > From: devel@edk2.groups.io [mailto:devel@edk2.groups.io] On Behalf Of
> > Leif Lindholm
> > Sent: Friday, September 27, 2019 7:46 AM
> > To: devel@edk2.groups.io; Chang, Abner (HPS SW/FW Technologist)
> > <abner.ch...@hpe.com>
> > Subject: Re: [edk2-devel] [edk2-staging/RISC-V-V2 PATCH v2 10/29]
> > MdePkg/BasePeCoff: Add RISC-V PE/Coff related code.
> > 
> > On Mon, Sep 23, 2019 at 08:31:36AM +0800, Abner Chang wrote:
> > > Support RISC-V image relocation.
> > >
> > > Signed-off-by: Abner Chang <abner.ch...@hpe.com>
> > > ---
> > >  MdePkg/Library/BasePeCoffLib/BasePeCoff.c          |   3 +-
> > >  MdePkg/Library/BasePeCoffLib/BasePeCoffLib.inf     |   5 +
> > >  MdePkg/Library/BasePeCoffLib/BasePeCoffLib.uni     |   2 +
> > >  .../Library/BasePeCoffLib/BasePeCoffLibInternals.h |   1 +
> > >  .../Library/BasePeCoffLib/RiscV/PeCoffLoaderEx.c   | 142
> > +++++++++++++++++++++
> > >  5 files changed, 152 insertions(+), 1 deletion(-)  create mode 100644
> > > MdePkg/Library/BasePeCoffLib/RiscV/PeCoffLoaderEx.c
> > >
> > > diff --git a/MdePkg/Library/BasePeCoffLib/BasePeCoff.c
> > > b/MdePkg/Library/BasePeCoffLib/BasePeCoff.c
> > > index 07bb62f..97e0ff4 100644
> > > --- a/MdePkg/Library/BasePeCoffLib/BasePeCoff.c
> > > +++ b/MdePkg/Library/BasePeCoffLib/BasePeCoff.c
> > > @@ -1,6 +1,6 @@
> > >  /** @file
> > >    Base PE/COFF loader supports loading any PE32/PE32+ or TE image,
> > > but
> > > -  only supports relocating IA32, x64, IPF, and EBC images.
> > > +  only supports relocating IA32, x64, IPF, ARM, RISC-V and EBC images.
> > >
> > >    Caution: This file requires additional review when modified.
> > >    This library will have external input - PE/COFF image.
> > > @@ -17,6 +17,7 @@
> > >
> > >    Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
> > >    Portions copyright (c) 2008 - 2009, Apple Inc. All rights
> > > reserved.<BR>
> > > +  Portions Copyright (c) 2016, Hewlett Packard Enterprise Development
> > > + LP. All rights reserved.<BR>
> > >    SPDX-License-Identifier: BSD-2-Clause-Patent
> > >
> > >  **/
> > > diff --git a/MdePkg/Library/BasePeCoffLib/BasePeCoffLib.inf
> > > b/MdePkg/Library/BasePeCoffLib/BasePeCoffLib.inf
> > > index 395c140..b190494 100644
> > > --- a/MdePkg/Library/BasePeCoffLib/BasePeCoffLib.inf
> > > +++ b/MdePkg/Library/BasePeCoffLib/BasePeCoffLib.inf
> > > @@ -3,6 +3,7 @@
> > >  #  The IPF version library supports loading IPF and EBC PE/COFF image.
> > >  #  The IA32 version library support loading IA32, X64 and EBC PE/COFF
> > images.
> > >  #  The X64 version library support loading IA32, X64 and EBC PE/COFF
> > images.
> > > +#  The RISC-V version library support loading RISC-V images.
> > >  #
> > >  #  Caution: This module requires additional review when modified.
> > >  #  This library will have external input - PE/COFF image.
> > > @@ -11,6 +12,7 @@
> > >  #
> > >  #  Copyright (c) 2006 - 2018, Intel Corporation. All rights
> > > reserved.<BR>  #  Portions copyright (c) 2008 - 2009, Apple Inc. All
> > > rights reserved.<BR>
> > > +#  Copyright (c) 2016, Hewlett Packard Enterprise Development LP. All
> > > +rights reserved.<BR>
> > >  #
> > >  #  SPDX-License-Identifier: BSD-2-Clause-Patent  # @@ -41,6 +43,9 @@
> > > [Sources.ARM]
> > >    Arm/PeCoffLoaderEx.c
> > >
> > > +[Sources.RISCV64]
> > > +  RiscV/PeCoffLoaderEx.c
> > > +
> > >  [Packages]
> > >    MdePkg/MdePkg.dec
> > >
> > > diff --git a/MdePkg/Library/BasePeCoffLib/BasePeCoffLib.uni
> > > b/MdePkg/Library/BasePeCoffLib/BasePeCoffLib.uni
> > > index b0ea702..8616ca3 100644
> > > --- a/MdePkg/Library/BasePeCoffLib/BasePeCoffLib.uni
> > > +++ b/MdePkg/Library/BasePeCoffLib/BasePeCoffLib.uni
> > > @@ -4,6 +4,7 @@
> > >  // The IPF version library supports loading IPF and EBC PE/COFF image.
> > >  // The IA32 version library support loading IA32, X64 and EBC PE/COFF
> > images.
> > >  // The X64 version library support loading IA32, X64 and EBC PE/COFF
> > images.
> > > +// The RISC-V version library support loading RISC-V32 and RISC-V64
> > PE/COFF images.
> > >  //
> > >  // Caution: This module requires additional review when modified.
> > >  // This library will have external input - PE/COFF image.
> > > @@ -12,6 +13,7 @@
> > >  //
> > >  // Copyright (c) 2006 - 2018, Intel Corporation. All rights
> > > reserved.<BR>  // Portions copyright (c) 2008 - 2009, Apple Inc. All
> > > rights reserved.<BR>
> > > +// Copyright (c) 2016, Hewlett Packard Enterprise Development LP. All
> > > +rights reserved.<BR>
> > >  //
> > >  // SPDX-License-Identifier: BSD-2-Clause-Patent  // diff --git
> > > a/MdePkg/Library/BasePeCoffLib/BasePeCoffLibInternals.h
> > > b/MdePkg/Library/BasePeCoffLib/BasePeCoffLibInternals.h
> > > index b74277f..9c33703 100644
> > > --- a/MdePkg/Library/BasePeCoffLib/BasePeCoffLibInternals.h
> > > +++ b/MdePkg/Library/BasePeCoffLib/BasePeCoffLibInternals.h
> > > @@ -2,6 +2,7 @@
> > >    Declaration of internal functions in PE/COFF Lib.
> > >
> > >    Copyright (c) 2006 - 2010, Intel Corporation. All rights
> > > reserved.<BR>
> > > +  Copyright (c) 2016, Hewlett Packard Enterprise Development LP. All
> > > + rights reserved.<BR>
> > 
> > You only get to add copyright when you otherwise modify the file :)
> > 
> > >    SPDX-License-Identifier: BSD-2-Clause-Patent
> > >
> > >  **/
> > > diff --git a/MdePkg/Library/BasePeCoffLib/RiscV/PeCoffLoaderEx.c
> > > b/MdePkg/Library/BasePeCoffLib/RiscV/PeCoffLoaderEx.c
> > > new file mode 100644
> > > index 0000000..8eb37f9
> > > --- /dev/null
> > > +++ b/MdePkg/Library/BasePeCoffLib/RiscV/PeCoffLoaderEx.c
> > > @@ -0,0 +1,142 @@
> > > +/** @file
> > > +  PE/Coff loader for RISC-V PE image
> > > +
> > > +  Copyright (c) 2016, Hewlett Packard Enterprise Development LP. All
> > > +rights reserved.<BR>
> > > +  SPDX-License-Identifier: BSD-2-Clause-Patent **/ #include
> > > +"BasePeCoffLibInternals.h"
> > > +#include <Library/BaseLib.h>
> > > +
> > > +//
> > > +// RISC-V definition.
> > > +//
> > > +#define RV_X(x, s, n) (((x) >> (s)) & ((1<<(n))-1)) #define
> > > +RISCV_IMM_BITS 12 #define RISCV_IMM_REACH
> > (1LL<<RISCV_IMM_BITS)
> > > +#define RISCV_CONST_HIGH_PART(VALUE) \
> > > +  (((VALUE) + (RISCV_IMM_REACH/2)) & ~(RISCV_IMM_REACH-1))
> > 
> > This looked familiar, so I had a look.
> > This block is copied around - it exists in:
> > - BaseTools/Source/C/Common/PeCoffLoaderEx.c
> > - BaseTools/Source/C/GenFw/Elf64Convert.c
> > - MdePkg/Library/BasePeCoffLib/RiscV/PeCoffLoaderEx.c
> > 
> > This needs to be moved somewhere central and included elsewhere.
> > BaseTools and MdePkg unfortunately duplicate a lot of stuff, but this still
> > belongs in a common header file for either.
> 
> I can consolidate that macro in two files under BaseTools, but not
> consolidating macro in files in both MdePkg and BaseTools. BaseTools
> and edk2 are two separate projects and could be built individually
> based on my understanding.
>
> I have no idea how to leverage one header file from both projects
> and I don't  go that far to address it.

Oh, indeed. This was me bemoaning the current state of things - not
suggesting you need to fix it (beyond having only one copy for
BaseTools and one copy for the platform code.).

I need to check my use of English subtleties:
"belongs in a common header file for either" means "one for each".

Best Regards,

Leif

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