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BaseTools/GenFw: Disable support for R_X86_64_32S 

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=999

Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Zenith432 <zenith432@users.sourceforge.net>
Reviewed-by: Liming Gao <liming.gao@intel.com>
This commit is contained in:
Zenith432 2018-07-10 16:50:36 +08:00 committed by Liming Gao
parent ecbaa856da
commit c6a14de3ef
1 changed files with 22 additions and 1 deletions
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23
BaseTools/Source/C/GenFw/Elf64Convert.c
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@ -1172,7 +1172,28 @@ WriteRelocations64 (
+ (Rel->r_offset - SecShdr->sh_addr)),
EFI_IMAGE_REL_BASED_DIR64);
break;
case R_X86_64_32S:
//
// R_X86_64_32 and R_X86_64_32S are ELF64 relocations emitted when using
// the SYSV X64 ABI small non-position-independent code model.
// R_X86_64_32 is used for unsigned 32-bit immediates with a 32-bit operand
// size. The value is either not extended, or zero-extended to 64 bits.
// R_X86_64_32S is used for either signed 32-bit non-rip-relative displacements
// or signed 32-bit immediates with a 64-bit operand size. The value is
// sign-extended to 64 bits.
// EFI_IMAGE_REL_BASED_HIGHLOW is a PE relocation that uses 32-bit arithmetic
// for rebasing an image.
// EFI PE binaries declare themselves EFI_IMAGE_FILE_LARGE_ADDRESS_AWARE and
// may load above 2GB. If an EFI PE binary with a converted R_X86_64_32S
// relocation is loaded above 2GB, the value will get sign-extended to the
// negative part of the 64-bit address space. The negative part of the 64-bit
// address space is unmapped, so accessing such an address page-faults.
// In order to support R_X86_64_32S, it is necessary to unset
// EFI_IMAGE_FILE_LARGE_ADDRESS_AWARE, and the EFI PE loader must implement
// this flag and abstain from loading such a PE binary above 2GB.
// Since this feature is not supported, support for R_X86_64_32S (and hence
// the small non-position-independent code model) is disabled.
//
// case R_X86_64_32S:
case R_X86_64_32:
VerboseMsg ("EFI_IMAGE_REL_BASED_HIGHLOW Offset: 0x%08X",
mCoffSectionsOffset[RelShdr->sh_info] + (Rel->r_offset - SecShdr->sh_addr));