Re: [edk2-devel][PATCH] BaseTools/GenFw: Enhance to add export table in PE-COFF

["Michael Kubacki" <mikuback@linux.microsoft.com>]

Got it, thanks for the update.

On 1/26/2022 10:04 PM, Huang, Li-Xia wrote:
> Hi Michael,
> 
> Thanks for your response.
> 
> Sorry I didn't give enough context for my question, I mean the ' SizeOfInitializedData' in Optional header of PE-COFF file.
> SizeOfInitializedData
> The size of the initialized data section, or the sum of all such sections if there are multiple data sections.
> 
> I had an experiment,  compare the .efi files generated by MSVC tool  - one with PRM exports and the other without,  the size of InitializedData in optional header becomes larger with PRM exports. So it shows that export table will be included in initialized data.
> #if defined(_MSC_VER)
>    #define PRM_EXPORT_API                          __declspec(dllexport)
> #else
>    #define PRM_EXPORT_API
> #endif
> 
> Regards,
> Lisa
> 
> -----Original Message-----
> From: Michael Kubacki <mikuback@linux.microsoft.com>
> Sent: 2022年1月27日 4:19
> To: Huang, Li-Xia <lisa.huang@intel.com>; Michael Kubacki <michael.kubacki@outlook.com>; devel@edk2.groups.io; Gao, Liming <gaoliming@byosoft.com.cn>; Feng, Bob C <bob.c.feng@intel.com>
> Cc: Chen, Christine <yuwei.chen@intel.com>; Wu, Yidong <yidong.wu@intel.com>; Xu, Wei6 <wei6.xu@intel.com>; You, Benjamin <benjamin.you@intel.com>
> Subject: Re: [edk2-devel][PATCH] BaseTools/GenFw: Enhance to add export table in PE-COFF
> 
> Are you referring to "static data"? If so, no. That is allocated at boot time and placed into the appropriate handler information structures.
> 
> The items in the export table for a given PRM Module are:
> 1. PRM handler count
> 2. Platform GUID (automatically applied from the DSC
> EDKII_DSC_PLATFORM_GUID)
>      (https://bugzilla.tianocore.org/show_bug.cgi?id=2969)
> 3. The PRM Module GUID
> 4. A list of PRM handler GUID<->PRM handler names
>      (used by FW discovery to map handler in export to GUID entry in the PRMT it produces)
> 
> https://github.com/tianocore/edk2-staging/blob/PlatformRuntimeMechanism/PrmPkg/Include/PrmExportDescriptor.h
> 
> Thanks,
> Michael
> 
> On 1/26/2022 3:16 AM, Huang, Li-Xia wrote:
>> Hi Michael,
>>
>> Sure, I will include you if any update on PRM functionality.
>>
>> BTW, I have a question about InitializedData, does it include export section or not? Thanks.
>>
>> Regards,
>> Lisa
>>
>> -----Original Message-----
>> From: Michael Kubacki <michael.kubacki@outlook.com>
>> Sent: 2022年1月22日 10:50
>> To: devel@edk2.groups.io; Huang, Li-Xia <lisa.huang@intel.com>; Gao,
>> Liming <gaoliming@byosoft.com.cn>; Feng, Bob C <bob.c.feng@intel.com>
>> Cc: Chen, Christine <yuwei.chen@intel.com>; Wu, Yidong
>> <yidong.wu@intel.com>; Xu, Wei6 <wei6.xu@intel.com>; You, Benjamin
>> <benjamin.you@intel.com>; mikuback@linux.microsoft.com
>> Subject: Re: [edk2-devel][PATCH] BaseTools/GenFw: Enhance to add
>> export table in PE-COFF
>>
>> Hi Lisa,
>>
>> Thank you for contributing this. Please include me on functionality related to PRM.
>>
>> I was using the PRM_EXPORT_API macro
>> (https://github.com/tianocore/edk2-staging/blob/9da8abf66505d8ff636aae
>> cc429a5237ce226650/PrmPkg/Include/Prm.h#L17)
>> to support this on MS toolchain.
>>
>> It looks like this is to add similar functionality for ELF binaries using GenFw?
>>
>> Thanks,
>> Michael
>>
>> On 1/18/2022 1:19 AM, Huang, Li-Xia wrote:
>>> Hi Liming,
>>>
>>> Thanks for your feedback.
>>>
>>> I have added some detail in BZ. 😊
>>>
>>> https://bugzilla.tianocore.org/show_bug.cgi?id=3802#add_comment
>>> <https://bugzilla.tianocore.org/show_bug.cgi?id=3802#add_comment>
>>>
>>> Regards,
>>>
>>> Lisa
>>>
>>> *From:*gaoliming <gaoliming@byosoft.com.cn>
>>> *Sent:* 2022年1月18日13:20
>>> *To:* devel@edk2.groups.io; Huang, Li-Xia <lisa.huang@intel.com>;
>>> Feng, Bob C <bob.c.feng@intel.com>
>>> *Cc:* Chen, Christine <yuwei.chen@intel.com>; Wu, Yidong
>>> <yidong.wu@intel.com>; Xu, Wei6 <wei6.xu@intel.com>; You, Benjamin
>>> <benjamin.you@intel.com>
>>> *Subject:* 回复: [edk2-devel][PATCH] BaseTools/GenFw: Enhance to add
>>> export table in PE-COFF
>>>
>>> Lisa:
>>>
>>>     Can you give more background about PRM usage? What new usage
>>> requires RPM? Can you add the detail in BZ?
>>>
>>> Thanks
>>>
>>> Liming
>>>
>>> *发件人**:*devel@edk2.groups.io
>>> <mailto:devel@edk2.groups.io><devel@edk2.groups.io
>>> <mailto:devel@edk2.groups.io>> *代表 *Huang, Li-Xia
>>> *发送时间:* 2022年1月17日 11:09
>>> *收件人:* Feng, Bob C <bob.c.feng@intel.com
>>> <mailto:bob.c.feng@intel.com>>; devel@edk2.groups.io
>>> <mailto:devel@edk2.groups.io>
>>> *抄送:* Gao, Liming <gaoliming@byosoft.com.cn
>>> <mailto:gaoliming@byosoft.com.cn>>; Chen, Christine
>>> <yuwei.chen@intel.com <mailto:yuwei.chen@intel.com>>; Wu, Yidong
>>> <yidong.wu@intel.com <mailto:yidong.wu@intel.com>>; Xu, Wei6
>>> <wei6.xu@intel.com <mailto:wei6.xu@intel.com>>; You, Benjamin
>>> <benjamin.you@intel.com <mailto:benjamin.you@intel.com>>
>>> *主题:* Re: [edk2-devel][PATCH] BaseTools/GenFw: Enhance to add export
>>> table in PE-COFF
>>>
>>> Hi Bob,
>>>
>>> Thanks for your comments.
>>>
>>> 1.  I will add the help information for "--PRM";
>>>
>>> 2.
>>>
>>> @@ -750,7 +818,7 @@ ScanSections64 (
>>>
>>>         if (shdr->sh_addralign <= mCoffAlignment) {
>>>
>>>           continue;
>>>
>>>         }
>>>
>>> -    if (IsTextShdr(shdr) || IsDataShdr(shdr) || IsHiiRsrcShdr(shdr))
>>> {
>>>
>>> +    if (IsTextShdr(shdr) || IsDataShdr(shdr) || IsHiiRsrcShdr(shdr)
>>> +||
>>> IsSymbolShdr(shdr)) {
>>>
>>>           mCoffAlignment = (UINT32)shdr->sh_addralign;
>>>
>>>         }
>>>
>>>       }
>>>
>>> 1) Above change is to Set mCoffAlignment to the maximum alignment of
>>> the input sections including symbol section.
>>>
>>>        The symbol section will only exist with below change, so it
>>> should have no effect to other drivers.
>>>
>>> build_rule.template:
>>>
>>>        <Command.GCC>
>>>
>>>            $(CP) ${src} $(DEBUG_DIR)(+)$(MODULE_NAME).debug
>>>
>>>            #$(OBJCOPY) --strip-unneeded -R .eh_frame ${src}
>>>
>>>            $(OBJCOPY) $(OBJCOPY_STRIPFLAG) ${src}
>>>
>>> tools_def.template:
>>>
>>> *_*_*_OBJCOPY_STRIPFLAG            = --strip-unneeded -R .eh_frame
>>>
>>> PrmAddrTransDsm.inf:
>>>
>>> [BuildOptions.common]
>>>
>>> ...
>>>
>>>      GCC: *_*_*_OBJCOPY_STRIPFLAG == -R .eh_frame
>>>
>>> 2) For PRM driver, sh_addralign of symbol section is 8, and less than
>>> other sections such as Text and Data (sh_addralign is 4096).
>>>
>>> Regards,
>>>
>>> Lisa
>>>
>>> -----Original Message-----
>>> From: Feng, Bob C <bob.c.feng@intel.com
>>> <mailto:bob.c.feng@intel.com>>
>>> Sent: 2022年1月14日 14:12
>>> To: Huang, Li-Xia <lisa.huang@intel.com
>>> <mailto:lisa.huang@intel.com>>; devel@edk2.groups.io
>>> <mailto:devel@edk2.groups.io>
>>> Cc: Gao, Liming <gaoliming@byosoft.com.cn
>>> <mailto:gaoliming@byosoft.com.cn>>; Chen, Christine
>>> <yuwei.chen@intel.com <mailto:yuwei.chen@intel.com>>
>>> Subject: RE: [edk2-devel][PATCH] BaseTools/GenFw: Enhance to add
>>> export table in PE-COFF
>>>
>>> Hi Lixia,
>>>
>>> This patch introduce a new command line option --PRM. Could you add
>>> the help information about --PRM?
>>>
>>> Could you provide more information about the below change? Would
>>> there be side-effect?
>>>
>>> @@ -750,7 +818,7 @@ ScanSections64 (
>>>
>>>         if (shdr->sh_addralign <= mCoffAlignment) {
>>>
>>>           continue;
>>>
>>>         }
>>>
>>> -    if (IsTextShdr(shdr) || IsDataShdr(shdr) || IsHiiRsrcShdr(shdr))
>>> {
>>>
>>> +    if (IsTextShdr(shdr) || IsDataShdr(shdr) || IsHiiRsrcShdr(shdr)
>>> +||
>>> IsSymbolShdr(shdr)) {
>>>
>>>           mCoffAlignment = (UINT32)shdr->sh_addralign;
>>>
>>>         }
>>>
>>>       }
>>>
>>> Thanks,
>>>
>>> Bob
>>>
>>> -----Original Message-----
>>>
>>> From: Huang, Li-Xia <lisa.huang@intel.com
>>> <mailto:lisa.huang@intel.com>>
>>>
>>> Sent: Wednesday, January 12, 2022 3:44 PM
>>>
>>> To: devel@edk2.groups.io <mailto:devel@edk2.groups.io>
>>>
>>> Cc: Huang, Li-Xia <lisa.huang@intel.com
>>> <mailto:lisa.huang@intel.com>>; Gao, Liming <gaoliming@byosoft.com.cn
>>> <mailto:gaoliming@byosoft.com.cn>>; Feng, Bob C <bob.c.feng@intel.com
>>> <mailto:bob.c.feng@intel.com>>; Chen, Christine <yuwei.chen@intel.com
>>> <mailto:yuwei.chen@intel.com>>
>>>
>>> Subject: [edk2-devel][PATCH] BaseTools/GenFw: Enhance to add export
>>> table in PE-COFF
>>>
>>> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3802
>>> <https://bugzilla.tianocore.org/show_bug.cgi?id=3802>
>>>
>>> Since PRM module needs to support export table in PE-COFF, we'll
>>> enhance GenFw tool to support this.
>>>
>>> Add one export flag in GenFw tool. If export flag is set:
>>>
>>> Step1: Scan ELF symbol table based on PRM module descriptor to get
>>> descriptor offset address;
>>>
>>> Step2: Find PRM handlers number and name in COFF file based on the
>>> address from step1;
>>>
>>> Step3: Write PRM info such as handler name and export RVA into COFF
>>> export table.
>>>
>>> Cc: Liming Gao <gaoliming@byosoft.com.cn
>>> <mailto:gaoliming@byosoft.com.cn>>
>>>
>>> Cc: Bob Feng <bob.c.feng@intel.com <mailto:bob.c.feng@intel.com>>
>>>
>>> Cc: Yuwei Chen <yuwei.chen@intel.com <mailto:yuwei.chen@intel.com>>
>>>
>>> Signed-off-by: Lixia Huang <lisa.huang@intel.com
>>> <mailto:lisa.huang@intel.com>>
>>>
>>> ---
>>>
>>> BaseTools/Source/C/GenFw/Elf64Convert.c       | 254
>>> +++++++++++++++++-
>>>
>>> BaseTools/Source/C/GenFw/ElfConvert.c         |  10 +
>>>
>>> BaseTools/Source/C/GenFw/ElfConvert.h         |  42 ++-
>>>
>>> BaseTools/Source/C/GenFw/GenFw.c              |  11 +-
>>>
>>> .../C/Include/IndustryStandard/PeImage.h      |   7 +
>>>
>>> 5 files changed, 318 insertions(+), 6 deletions(-)
>>>
>>> diff --git a/BaseTools/Source/C/GenFw/Elf64Convert.c
>>> b/BaseTools/Source/C/GenFw/Elf64Convert.c
>>>
>>> index 0bb3ead228..0079507356 100644
>>>
>>> --- a/BaseTools/Source/C/GenFw/Elf64Convert.c
>>>
>>> +++ b/BaseTools/Source/C/GenFw/Elf64Convert.c
>>>
>>> @@ -56,6 +56,18 @@ WriteDebug64 (
>>>
>>>       VOID   ); +STATIC+VOID+ScanSymbol64 (+  VOID+
>>> );++STATIC+VOID+WriteExport64 (+  VOID+  );+ STATIC VOID
>>> SetImageSize64 (@@ -122,7 +134,7 @@ STATIC UINT32 mDataOffset;
>>>
>>> STATIC UINT32 mHiiRsrcOffset; STATIC UINT32 mRelocOffset; STATIC
>>> UINT32 mDebugOffset;-+STATIC UINT32 mExportOffset; // // Used for
>>> RISC-V relocations. //@@ -132,6 +144,14 @@ STATIC Elf64_Half
>>> mRiscVPass1SymSecIndex = 0;
>>>
>>> STATIC INT32       mRiscVPass1Offset; STATIC INT32
>>> mRiscVPass1GotFixup; +//+// Used for Export section.+//+STATIC
>>> UINT32      mExportSize;+STATIC UINT32
>>> mExportRVA[PRM_MODULE_EXPORT_SYMBOL_NUM];+STATIC UINT32
>>> mExportSymNum;+STATIC CHAR8
>>> mExportSymName[PRM_MODULE_EXPORT_SYMBOL_NUM][PRM_HANDLER_NAME_MAXIMUM
>>> _ LENGTH];+ // // Initialization Function //@@ -200,6 +220,10 @@
>>> InitializeElf64 (
>>>
>>>       ElfFunctions->SetImageSize = SetImageSize64;
>>> ElfFunctions->CleanUp = CleanUp64; +  if (mExportFlag) {+
>>> ElfFunctions->ElfFunctions->ScanSymbol =
>>> ScanSymbol64;+    ElfFunctions->WriteExport = WriteExport64;+  }
>>> return TRUE; } @@ -263,6 +287,17 @@ IsHiiRsrcShdr (
>>>
>>>       return (BOOLEAN) (strcmp((CHAR8*)mEhdr + Namedr->sh_offset +
>>> Shdr->sh_name, ELF_HII_SECTION_NAME) == 0); }
>>> +STATIC+BOOLEAN+IsSymbolShdr (+  Elf_Shdr *Shdr+  )+{+  Elf_Shdr
>>> *Namehdr = GetShdrByIndex(mEhdr->e_shstrndx);++  return (BOOLEAN)
>>> (strcmp((CHAR8*)mEhdr + Namehdr->sh_offset + Shdr->sh_name,
>>> ELF_SYMBOL_SECTION_NAME) == 0);+}+ STATIC BOOLEAN IsDataShdr (@@
>>> -335,6
>>> +370,38 @@ GetSymName (
>>>
>>>       return StrtabContents + Sym->st_name; } +//+// Get Prm Handler
>>> number and name+//+STATIC+VOID+FindPrmHandler (+  UINT64 Offset+
>>> )+{+ PRM_MODULE_EXPORT_DESCRIPTOR_STRUCT_HEADER *PrmExport;+  UINT32
>>> NameOffset;+  UINT32   HandlerNum;+ UINT32   Index;+  UINT8
>>> SymName[PRM_HANDLER_NAME_MAXIMUM_LENGTH];++  PrmExport =
>>> (PRM_MODULE_EXPORT_DESCRIPTOR_STRUCT_HEADER*)(mCoffFile + Offset);+
>>> NameOffset = sizeof(PRM_MODULE_EXPORT_DESCRIPTOR_STRUCT_HEADER) +
>>> sizeof(EFI_GUID);++  for (HandlerNum = 0; HandlerNum <
>>> PrmExport->NumberPrmHandlers; HandlerNum++) {+    for (Index = 0;
>>> PrmExport->Index
>>> < PRM_HANDLER_NAME_MAXIMUM_LENGTH; Index++) {+      SymName[Index] =
>>> *((UINT8 *)PrmExport + NameOffset + Index);+      if (SymName[Index]
>>> ==
>>> 0) {+        break;+ }+    }++
>>> strcpy(mExportSymName[mExportSymNum],
>>> (CHAR8*)SymName);+    NameOffset += PRM_HANDLER_NAME_MAXIMUM_LENGTH +
>>> sizeof(EFI_GUID);+    mExportSymNum ++;+  }+}+ // // Find the ELF
>>> section hosting the GOT from an ELF Rva //   of a single GOT entry.
>>> Normally, GOT is placed in@@ -717,6 +784,7 @@ ScanSections64 (
>>>
>>>       UINT32                          CoffEntry;
>>> UINT32                          SectionCount; BOOLEAN
>>> FoundSection;+
>>> UINT32                          Offset;    CoffEntry = 0; mCoffOffset
>>> = 0;@@ -750,7 +818,7 @@ ScanSections64 (
>>>
>>>         if (shdr->sh_addralign <= mCoffAlignment) {       continue;
>>> }-    if (IsTextShdr(shdr) || IsDataShdr(shdr) ||
>>> IsHiiRsrcShdr(shdr)) {+    if (IsTextShdr(shdr) || IsDataShdr(shdr)
>>> || IsHiiRsrcShdr(shdr)
>>> ||
>>> IsSymbolShdr(shdr)) {       mCoffAlignment =
>>> (UINT32)shdr->sh_addralign;     }   }@@ -880,6 +948,16 @@
>>> ScanSections64 (
>>>
>>>         Warning (NULL, 0, 0, NULL, "Multiple sections in %s are merged
>>> into 1 data section. Source level debug might not work correctly.",
>>> mInImageName);   } +  //+  //  The Symbol sections.+  //+  if
>>> (mExportFlag) {+    mExportOffset = mCoffOffset;+    mExportSize =
>>> sizeof(EFI_IMAGE_EXPORT_DIRECTORY) + strlen(mInImageName) + 1;+
>>> mCoffOffset += mExportSize;+    mCoffOffset =
>>> CoffAlign(mCoffOffset);+ }+   //   //  The HII resource sections.
>>> //@@ -962,7 +1040,11 @@
>>> ScanSections64 (
>>>
>>>         | EFI_IMAGE_FILE_LARGE_ADDRESS_AWARE;
>>> NtHdr->Pe32Plus.OptionalHeader.SizeOfCode = mDataOffset -
>>> NtHdr->mTextOffset;- Pe32Plus.OptionalHeader.SizeOfInitializedData =
>>> NtHdr->mRelocOffset -
>>> mDataOffset;+  if(mExportFlag) {+
>>> NtHdr->Pe32Plus.OptionalHeader.SizeOfInitializedData = mRelocOffset -
>>> mExportOffset;+  } else {+
>>> NtHdr->Pe32Plus.OptionalHeader.SizeOfInitializedData = mRelocOffset -
>>> mDataOffset;+  }
>>> NtHdr->Pe32Plus.OptionalHeader.SizeOfUninitializedData = 0;
>>> NtHdr->Pe32Plus.OptionalHeader.AddressOfEntryPoint = CoffEntry; @@
>>> -989,8 +1071,17 @@ ScanSections64 (
>>>
>>>         NtHdr->Pe32Plus.FileHeader.NumberOfSections--;   } +  //+  //
>>> If found symbol, add edata section between data and rsrc section+
>>> //+
>>> if(mExportFlag) {+    Offset = mExportOffset;+  } else {+    Offset =
>>> mHiiRsrcOffset;+  }+   if ((mHiiRsrcOffset - mDataOffset) > 0) {-
>>> CreateSectionHeader (".data", mDataOffset, mHiiRsrcOffset -
>>> mDataOffset,+    CreateSectionHeader (".data", mDataOffset, Offset -
>>> mDataOffset,             EFI_IMAGE_SCN_CNT_INITIALIZED_DATA
>>> | EFI_IMAGE_SCN_MEM_WRITE | EFI_IMAGE_SCN_MEM_READ);@@ -999,6
>>> | +1090,20
>>> @@ ScanSections64 (
>>>
>>>         NtHdr->Pe32Plus.FileHeader.NumberOfSections--;   } +
>>> if(mExportFlag) {+    if ((mHiiRsrcOffset - mExportOffset) > 0) {+
>>> CreateSectionHeader (".edata", mExportOffset, mHiiRsrcOffset -
>>> mExportOffset,+              EFI_IMAGE_SCN_CNT_INITIALIZED_DATA+ |
>>> EFI_IMAGE_SCN_MEM_READ);+
>>> NtHdr->Pe32Plus.OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTR
>>> NtHdr->Y
>>> NtHdr->_EXPORT].Size
>>> = mHiiRsrcOffset - mExportOffset;+
>>> NtHdr->Pe32Plus.OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTR
>>> NtHdr->Y
>>> NtHdr->_EXPORT].VirtualAddress
>>> = mExportOffset;+ NtHdr->Pe32Plus.FileHeader.NumberOfSections++;+
>>> } else {+      // Don't make a section of size 0.+
>>> NtHdr->Pe32Plus.FileHeader.NumberOfSections--;+    }+  }+   if
>>> ((mRelocOffset - mHiiRsrcOffset) > 0) {     CreateSectionHeader
>>> (".rsrc", mHiiRsrcOffset, mRelocOffset - mHiiRsrcOffset,
>>> EFI_IMAGE_SCN_CNT_INITIALIZED_DATA@@ -1757,4 +1862,145 @@ CleanUp64 (
>>>
>>>       } } +STATIC+VOID+ScanSymbol64 (+  VOID+  )+{+  UINT32 shIndex;+
>>> UINT32      SymIndex;+  Elf_Sym     *Sym;+  UINT64 SymNum;+  const
>>> UINT8 *SymName;++  for (shIndex = 0; shIndex <
>>> mEhdr->e_shnum; shIndex++) {+    //+    // Determine if this is a
>>> mEhdr->symbol
>>> section.+    //+    Elf_Shdr *shdr = GetShdrByIndex(shIndex);+    if
>>> (!IsSymbolShdr(shdr)) {+      continue;+    }++    UINT8    *Symtab =
>>> (UINT8*)mEhdr + shdr->sh_offset;+    SymNum = (shdr->sh_size) /
>>> (shdr->sh_entsize);++ //+    // First Get PrmModuleExportDescriptor+
>>> //+    for (SymIndex = 0; SymIndex < SymNum; SymIndex++) {+      Sym
>>> = (Elf_Sym *)(Symtab + SymIndex * shdr->sh_entsize);+      SymName =
>>> GetSymName(Sym);+      if (SymName == NULL) {+          continue;+
>>> }++ if (strcmp((CHAR8*)SymName, PRM_MODULE_EXPORT_DESCRIPTOR_NAME)
>>> == 0) {+        //+        // Find PrmHandler Number and Name+ //+
>>> FindPrmHandler(Sym->st_value);++
>>> strcpy(mExportSymName[mExportSymNum], (CHAR8*)SymName);+
>>> mExportRVA[mExportSymNum] = (UINT32)(Sym->st_value);+ mExportSize
>>> += 2 * EFI_IMAGE_EXPORT_ADDR_SIZE + EFI_IMAGE_EXPORT_ORDINAL_SIZE +
>>> strlen((CHAR8 *)SymName) + 1;+        mExportSymNum ++;+ break;+
>>> }+    }++    //+    // Second Get PrmHandler+ //+    for (SymIndex =
>>> 0; SymIndex < SymNum; SymIndex++) {+      UINT32 ExpIndex;+      Sym
>>> = (Elf_Sym *)(Symtab + SymIndex *
>>> shdr->sh_entsize);+      SymName = GetSymName(Sym);+      if (SymName
>>> shdr->==
>>> NULL) {+          continue;+      }++      for (ExpIndex = 0;
>>> ExpIndex < (mExportSymNum -1); ExpIndex++) {+        if
>>> (strcmp((CHAR8*)SymName,
>>> mExportSymName[ExpIndex]) != 0) {+          continue;+        }+
>>> mExportRVA[ExpIndex] = (UINT32)(Sym->st_value);+        mExportSize
>>> +=
>>> 2
>>> * EFI_IMAGE_EXPORT_ADDR_SIZE + EFI_IMAGE_EXPORT_ORDINAL_SIZE +
>>> strlen((CHAR8 *)SymName) + 1;+      }+    }++    break;+
>>> }+}++STATIC+VOID+WriteExport64 (+  VOID+  )+{+
>>> EFI_IMAGE_OPTIONAL_HEADER_UNION     *NtHdr;+
>>> EFI_IMAGE_EXPORT_DIRECTORY          *ExportDir;+
>>> EFI_IMAGE_DATA_DIRECTORY *DataDir;+  UINT32 FileNameOffset;+  UINT32
>>> FuncOffset;+
>>> UINT16                              Index;+
>>> UINT8                               *Tdata = NULL;++  ExportDir =
>>> (EFI_IMAGE_EXPORT_DIRECTORY*)(mCoffFile + mExportOffset);+
>>> ExportDir->Characteristics = 0;+  ExportDir->TimeDateStamp = 0;+
>>> ExportDir->MajorVersion = 0;+  ExportDir->MinorVersion =0;+ Name =
>>> ExportDir->0;+
>>> ExportDir->ExportDir->NumberOfFunctions = mExportSymNum;+
>>> ExportDir->NumberOfNames = mExportSymNum;+ ExportDir->Base =
>>> EFI_IMAGE_EXPORT_ORDINAL_BASE;+  ExportDir->AddressOfFunctions =
>>> mExportOffset + sizeof(EFI_IMAGE_EXPORT_DIRECTORY);+
>>> ExportDir->AddressOfNames = ExportDir->AddressOfFunctions +
>>> EFI_IMAGE_EXPORT_ADDR_SIZE * mExportSymNum;+
>>> ExportDir->AddressOfNameOrdinals = ExportDir->AddressOfNames +
>>> EFI_IMAGE_EXPORT_ADDR_SIZE * mExportSymNum;++  FileNameOffset =
>>> ExportDir->AddressOfNameOrdinals + EFI_IMAGE_EXPORT_ORDINAL_SIZE *
>>> mExportSymNum;+  FuncOffset = FileNameOffset + strlen(mInImageName) +
>>> 1;++  // Write Input image Name RVA+  Tdata = mCoffFile + 12;+
>>> *(UINT32 *)Tdata = FileNameOffset;++  // Write Input image Name+
>>> strcpy((char *)(mCoffFile + FileNameOffset), mInImageName);++  for
>>> (Index = 0; Index < mExportSymNum; Index++) {+    //+    // Write
>>> Export Address Table+ //+    Tdata = mCoffFile +
>>> ExportDir->AddressOfFunctions + Index * EFI_IMAGE_EXPORT_ADDR_SIZE;+
>>> ExportDir->*(UINT32 *)Tdata =
>>> mExportRVA[Index];++    //+    // Write Export Name Pointer Table+
>>> //+    Tdata = mCoffFile + ExportDir->AddressOfNames + Index *
>>> EFI_IMAGE_EXPORT_ADDR_SIZE;+ *(UINT32 *)Tdata = FuncOffset;++    //+
>>> // Write Export Ordinal table+    //+    Tdata = mCoffFile +
>>> ExportDir->AddressOfNameOrdinals + Index *
>>> EFI_IMAGE_EXPORT_ORDINAL_SIZE;+    *(UINT16 *)Tdata = Index;++    //+
>>> // Write Export Name Table+    //+ strcpy((char *)(mCoffFile +
>>> FuncOffset), mExportSymName[Index]);+    FuncOffset +=
>>> strlen(mExportSymName[Index]) + 1;+  }++  NtHdr =
>>> (EFI_IMAGE_OPTIONAL_HEADER_UNION *)(mCoffFile + mNtHdrOffset);+
>>> DataDir =
>>> &NtHdr->Pe32Plus.OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENT
>>> R
>>> Y_EXPORT];+
>>> DataDir->VirtualAddress = mExportOffset;+  DataDir->Size =
>>> mExportSize;++} diff --git a/BaseTools/Source/C/GenFw/ElfConvert.c
>>> b/BaseTools/Source/C/GenFw/ElfConvert.c
>>>
>>> index 7db8721167..795cdbd743 100644
>>>
>>> --- a/BaseTools/Source/C/GenFw/ElfConvert.c
>>>
>>> +++ b/BaseTools/Source/C/GenFw/ElfConvert.c
>>>
>>> @@ -223,6 +223,16 @@ ConvertElf (
>>>
>>>       VerboseMsg ("Write debug info.");   ElfFunctions.WriteDebug ();
>>> + //+  // For PRM Driver to Write export info.+  //+  if
>>> (mExportFlag) {+    VerboseMsg ("Scan symbol info.");+
>>> ElfFunctions.ScanSymbol ();+    VerboseMsg ("Write export info.");+
>>> ElfFunctions.WriteExport ();+  }+   //   // Make sure image size is
>>> correct before returning the new image.   //diff --git
>>> a/BaseTools/Source/C/GenFw/ElfConvert.h
>>> b/BaseTools/Source/C/GenFw/ElfConvert.h
>>>
>>> index 801e8de4a2..7920765fbb 100644
>>>
>>> --- a/BaseTools/Source/C/GenFw/ElfConvert.h
>>>
>>> +++ b/BaseTools/Source/C/GenFw/ElfConvert.h
>>>
>>> @@ -24,6 +24,7 @@ extern UINT8  *mCoffFile;  extern UINT32
>>> mTableOffset; extern UINT32 mOutImageType; extern UINT32
>>> mFileBufferSize;+extern BOOLEAN mExportFlag;  // // Common EFI
>>> specific data.@@ -31,6 +32,42 @@ extern UINT32 mFileBufferSize;
>>>
>>> #define ELF_HII_SECTION_NAME ".hii" #define ELF_STRTAB_SECTION_NAME
>>> ".strtab" #define MAX_COFF_ALIGNMENT 0x10000+#define
>>> ELF_SYMBOL_SECTION_NAME ".symtab"++//+// Platform Runtime Mechanism
>>> (PRM) specific data.+//+#define PRM_MODULE_EXPORT_SYMBOL_NUM
>>> 10+#define PRM_HANDLER_NAME_MAXIMUM_LENGTH 128++#define
>>> PRM_MODULE_EXPORT_DESCRIPTOR_NAME
>>> "PrmModuleExportDescriptor"+#define
>>> PRM_MODULE_EXPORT_DESCRIPTOR_SIGNATURE    SIGNATURE_64 ('P', 'R',
>>> 'M', '_', 'M', 'E', 'D', 'T')+#define PRM_MODULE_EXPORT_REVISION
>>> 0x0++//+// Platform Runtime Mechanism (PRM) Export Descriptor
>>> Structures+//+#pragma pack(push, 1)++typedef struct {+  EFI_GUID
>>>     PrmHandlerGuid;+  CHAR8
>>> PrmHandlerName[PRM_HANDLER_NAME_MAXIMUM_LENGTH];+}
>>> PRM_HANDLER_EXPORT_DESCRIPTOR_STRUCT;++typedef struct {+
>>> UINT64                                Signature;+
>>> UINT16                                Revision;+
>>> UINT16                                NumberPrmHandlers;+  EFI_GUID
>>> PlatformGuid;+  EFI_GUID                              ModuleGuid;+}
>>> PRM_MODULE_EXPORT_DESCRIPTOR_STRUCT_HEADER;++typedef struct {+
>>> PRM_MODULE_EXPORT_DESCRIPTOR_STRUCT_HEADER  Header;+
>>> PRM_HANDLER_EXPORT_DESCRIPTOR_STRUCT
>>> PrmHandlerExportDescriptors[1];+}
>>> PRM_MODULE_EXPORT_DESCRIPTOR_STRUCT;++#pragma pack(pop)  // // Filter
>>> Types@@ -38,7 +75,8 @@ extern UINT32 mFileBufferSize;
>>>
>>> typedef enum {   SECTION_TEXT,   SECTION_HII,-  SECTION_DATA+
>>> SECTION_DATA,+  SECTION_SYMBOL  } SECTION_FILTER_TYPES; @@ -50,6
>>> +88,8 @@ typedef struct {
>>>
>>>       BOOLEAN (*WriteSections) (SECTION_FILTER_TYPES  FilterType);
>>> VOID    (*WriteRelocations) ();   VOID    (*WriteDebug) ();+  VOID
>>> (*ScanSymbol) ();+  VOID    (*WriteExport) ();   VOID
>>> (*SetImageSize) ();   VOID    (*CleanUp) (); diff --git
>>> a/BaseTools/Source/C/GenFw/GenFw.c b/BaseTools/Source/C/GenFw/GenFw.c
>>>
>>> index 8cab70ba4d..c7de5b89d8 100644
>>>
>>> --- a/BaseTools/Source/C/GenFw/GenFw.c
>>>
>>> +++ b/BaseTools/Source/C/GenFw/GenFw.c
>>>
>>> @@ -87,7 +87,7 @@ UINT32 mImageTimeStamp = 0;
>>>
>>> UINT32 mImageSize = 0; UINT32 mOutImageType = FW_DUMMY_IMAGE; BOOLEAN
>>> mIsConvertXip = FALSE;-+BOOLEAN mExportFlag = FALSE;  STATIC
>>> EFI_STATUS@@ -1436,6 +1436,15 @@ Returns:
>>>
>>>           continue;     } +    if (stricmp (argv[0], "--PRM") == 0) {+
>>> if (!mExportFlag) {+        mExportFlag = TRUE;+      }+ argc --;+
>>> argv ++;+      continue;+    }+     if (argv[0][0] ==
>>> '-') {       Error (NULL, 0, 1000, "Unknown option", argv[0]); goto
>>> Finish;diff --git
>>> a/BaseTools/Source/C/Include/IndustryStandard/PeImage.h
>>> b/BaseTools/Source/C/Include/IndustryStandard/PeImage.h
>>>
>>> index f17b8ee19b..21c968e650 100644
>>>
>>> --- a/BaseTools/Source/C/Include/IndustryStandard/PeImage.h
>>>
>>> +++ b/BaseTools/Source/C/Include/IndustryStandard/PeImage.h
>>>
>>> @@ -571,6 +571,13 @@ typedef struct {
>>>
>>>       UINT32  AddressOfNameOrdinals; } EFI_IMAGE_EXPORT_DIRECTORY;
>>> +//+// Based export types.+//+#define EFI_IMAGE_EXPORT_ORDINAL_BASE
>>> 1+#define EFI_IMAGE_EXPORT_ADDR_SIZE        4+#define
>>> EFI_IMAGE_EXPORT_ORDINAL_SIZE     2+ /// /// DLL support. /// Import
>>> Format--
>>>
>>> 2.26.2.windows.1
>>>
>>>