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Last modification

• Rev 9927 2023-08-06 14:41:09
• Author: boppan

• Log message:

  [clink] Make it able to read and write more than 64k - 1 COFF relocation
  
  These are changes from two commits from the upstream clink repo (https://github.com/mkostoevr/clink) and one commit from the upstream epep repo (https://github.com/mkostoevr/epep).
  
  clink:
  
  Commit e63ed12ead17e47d77e848da0e7b9f4dd3ad5127
  Bugfix: Make it able to write more than 64k - 1 COFF relocations
  
  If the relocation count is greater than 0xffff then it can't fit
  in the NumberOfRelocations field of a section header. In order to
  specify greater relocation count IMAGE_SCN_LNK_NRELOC_OVFL flag
  should be added to Characteristics and the actual relocation count
  should be written into VirtualAddress field of the first COFF
  relocation.
  
  Commit 328fc3112a30fcaa808f2cad34028a6507d602a3
  Bugfix: Make it able to read more than 64k - 1 COFF relocations
  
  New EPEP API allows to read more than 64k - 1 relocations. Use it
  when reading relocation count for filling SectionInfo and when
  reading relocations for wriring the output file.
  
  epep:
  
  Commit 3bed4e348a486c346d0a452c58c1d85e1805c09d
  Feature: Higher-level COFF relocations API
  
  Number of COFF relocations of a section is stored in the 16-bit
  NumberOfRelocations field of a section header. If a COFF object has
  more than 2^16 - 1 relocations, then the value does not fit in the
  field.
  
  To solve this problem, IMAGE_SCN_LNK_NRELOC_OVFL flag of a section
  header has been introduced. If this flag is set for the section,
  then the actual number of relocations is stored in the
  VirtualAddress field of the first relocation.
  
  If the flag is set, then NumberOfRelocations field of the section
  header should be equal to 0xffff, othervice the linker should give
  an error.
  
  So this patch introduces few functions adressing this mechanism.
  
  epep_section_contains_extended_relocations:
  
  Checks whether the section has more than 2^16 - 1 relocations.
  Retrns error if the IMAGE_SCN_LNK_NRELOC_OVFL flag is set, but
  the NumberOfRelocations field is not equal to 0xffff.
  
  epep_get_section_extended_number_of_relocations:
  
  Reads the number of COFF relocations from the VirtualAddress
  field of the first COFF relocation.
  
  epep_get_section_number_of_relocations_x:
  
  Gives the number of meaningful relocations of the section.
  
  If the section has less than 2^16 relocations, then returns the
  value of the NumberOfRelocations field of the section header,
  othervice reads the number of relocations from the first COFF
  relocation, but: since the first relocation in this case is not
  meaningful, gives the actual number of relocations minus one.
  This is used in the function documented below.
  
  Returns 1 in the last argument if the section contains extended
  number of relocations, 0 othervice.
  
  epep_get_section_relocation_by_index_x:
  
  If the section has less than 2^16 relocations, then just reads
  a relocation by the given index. In case if the section has
  extended number of relocations, the first relocation is not
  meaningful, so it is skipped, and the relocation at index + 1
  is read instead.