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BaseTools/GenFw: move PE/COFF header closer to payload 

The secondary header (not the DOS header) of a PE/COFF binary
does not reside at a fixed offset. Instead, its offset into the
file is recorded in the DOS header.

This gives us the flexibility to move it, along with the section
headers, to right before the first section if there is considerable
space before it, i.e., when the PE/COFF file alignment is substantially
larger than the size of the header.

Since the PE/COFF to TE conversion replaces everything before the
section headers with a simple TE header, this change removes all
the header padding from such images, leading to smaller files.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Yingke Liu <yingke.d.liu@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18078 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Ard Biesheuvel 2015-07-27 13:50:09 +00:00 committed by abiesheuvel
parent 0192b71ca3
commit 02a5421f57
2 changed files with 20 additions and 0 deletions
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10
BaseTools/Source/C/GenFw/Elf32Convert.c
View File

@ -306,6 +306,16 @@ ScanSections32 (
}
}
//
// Move the PE/COFF header right before the first section. This will help us
// save space when converting to TE.
//
if (mCoffAlignment > mCoffOffset) {
mNtHdrOffset += mCoffAlignment - mCoffOffset;
mTableOffset += mCoffAlignment - mCoffOffset;
mCoffOffset = mCoffAlignment;
}
//
// First text sections.
//

10
BaseTools/Source/C/GenFw/Elf64Convert.c
View File

@ -300,6 +300,16 @@ ScanSections64 (
}
}
//
// Move the PE/COFF header right before the first section. This will help us
// save space when converting to TE.
//
if (mCoffAlignment > mCoffOffset) {
mNtHdrOffset += mCoffAlignment - mCoffOffset;
mTableOffset += mCoffAlignment - mCoffOffset;
mCoffOffset = mCoffAlignment;
}
//
// First text sections.
//