Re: [edk2-devel] [PATCH v2 3/6] CryptoPkg/IntrinsicLib: Fix possible unresolved external symbol issue

["Laszlo Ersek" <lersek@redhat.com>]

On 05/09/19 07:23, Xiaoyu lu wrote:
> From: Xiaoyu Lu <xiaoyux.lu@intel.com>
> 
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1089
> 
> This is for the upcoming upgrade to OpenSSL_1_1_1b
> 
> Compiler optimization(Visual Studio) may automatically use _ftol2
> instead of some type conversion. For example:
> 
>  OpensslLib.lib(drbg_lib.obj) : error LNK2001:
>     unresolved external symbol __ftol2
> 
> This patch add _ftol2 function for the compiler intrinsic.
> 
> Cc: Jian J Wang <jian.j.wang@intel.com>
> Cc: Ting Ye <ting.ye@intel.com>
> Signed-off-by: Xiaoyu Lu <xiaoyux.lu@intel.com>
> ---
>  CryptoPkg/Library/IntrinsicLib/Ia32/MathFtol.c  | 22 ++++++++++++++++++++++
>  CryptoPkg/Library/IntrinsicLib/IntrinsicLib.inf |  4 +++-
>  2 files changed, 25 insertions(+), 1 deletion(-)
>  create mode 100644 CryptoPkg/Library/IntrinsicLib/Ia32/MathFtol.c
> 
> diff --git a/CryptoPkg/Library/IntrinsicLib/Ia32/MathFtol.c b/CryptoPkg/Library/IntrinsicLib/Ia32/MathFtol.c
> new file mode 100644
> index 0000000..147a19a
> --- /dev/null
> +++ b/CryptoPkg/Library/IntrinsicLib/Ia32/MathFtol.c
> @@ -0,0 +1,22 @@
> +/** @file
> +  64-bit Math Worker Function.
> +  The 32-bit versions of C compiler generate calls to library routines
> +  to handle 64-bit math. These functions use non-standard calling conventions.
> +
> +Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
> +SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +/*
> + * Floating point to integer conversion.
> + */
> +__declspec(naked) void _ftol2 (void)
> +{
> +  _asm {
> +    fistp qword ptr [esp-8]
> +    mov   edx, [esp-4]
> +    mov   eax, [esp-8]
> +    ret
> +  }
> +}
> diff --git a/CryptoPkg/Library/IntrinsicLib/IntrinsicLib.inf b/CryptoPkg/Library/IntrinsicLib/IntrinsicLib.inf
> index 5a20967..fcbb933 100644
> --- a/CryptoPkg/Library/IntrinsicLib/IntrinsicLib.inf
> +++ b/CryptoPkg/Library/IntrinsicLib/IntrinsicLib.inf
> @@ -1,7 +1,7 @@
>  ## @file
>  #  Intrinsic Routines Wrapper Library Instance.
>  #
> -#  Copyright (c) 2010 - 2018, Intel Corporation. All rights reserved.<BR>
> +#  Copyright (c) 2010 - 2019, Intel Corporation. All rights reserved.<BR>
>  #  SPDX-License-Identifier: BSD-2-Clause-Patent
>  #
>  ##
> @@ -29,9 +29,11 @@
>  
>    Ia32/MathLShiftS64.c      | MSFT
>    Ia32/MathRShiftU64.c      | MSFT
> +  Ia32/MathFtol.c           | MSFT
>  
>    Ia32/MathLShiftS64.c      | INTEL
>    Ia32/MathRShiftU64.c      | INTEL
> +  Ia32/MathFtol.c           | INTEL
>  
>    Ia32/MathLShiftS64.nasm   | GCC
>    Ia32/MathRShiftU64.nasm   | GCC
> 

Thank you for splitting this out; this is a nice improvement for the
structure of the patch series.

Thanks
Laszlo