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

["Bob Feng" <bob.c.feng@intel.com>]

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> 
Sent: Wednesday, January 12, 2022 3:44 PM
To: devel@edk2.groups.io
Cc: Huang, Li-Xia <lisa.huang@intel.com>; Gao, Liming <gaoliming@byosoft.com.cn>; Feng, Bob C <bob.c.feng@intel.com>; Chen, Christine <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
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>
Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Yuwei Chen <yuwei.chen@intel.com>
Signed-off-by: Lixia Huang <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->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; 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 - mTextOffset;-  NtHdr->Pe32Plus.OptionalHeader.SizeOfInitializedData = 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_ENTRY_EXPORT].Size = mHiiRsrcOffset - mExportOffset;+      NtHdr->Pe32Plus.OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_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 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 == 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;+  ExportDir->Name = 0;+  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;+    *(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_ENTRY_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