[PATCH] BaseTools/GenFds: permit stripped MM_CORE_STANDALONE binaries

* [PATCH] BaseTools/GenFds: permit stripped MM_CORE_STANDALONE binaries
@ 2019-01-03 12:13 Ard Biesheuvel
  2019-01-03 16:05 ` Carsey, Jaben
  0 siblings, 1 reply; 5+ messages in thread
From: Ard Biesheuvel @ 2019-01-03 12:13 UTC (permalink / raw)
  To: edk2-devel; +Cc: Ard Biesheuvel, Bob Feng, Liming Gao, Jagadeesh Ujja

The standalone MM core is executed in place, and resides in a
separate execution context which may be space constrained.
Since code and data may be mapped with different attributes for
security reasons, the PE/COFF binary could have a section
alignment of 4 KB.

This means that any relocation data is not only useless, but it
will also take up 4 KB of valuable space.

So add support for the RELOCS_STRIPPED attribute on FFS files of
this type, so that we can get rid of the .reloc section altogether.
Combined with the FIXED attribute (which enables an optimization
in GenFfs that strips redundant padding) and a TE type binary, this
gets rid of all the needless padding around the standalone MM core
binary.

Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Jagadeesh Ujja <jagadeesh.ujja@arm.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 BaseTools/Source/Python/GenFds/EfiSection.py      | 2 +-
 BaseTools/Source/Python/GenFds/FdfParser.py       | 2 +-
 BaseTools/Source/Python/GenFds/FfsInfStatement.py | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/BaseTools/Source/Python/GenFds/EfiSection.py b/BaseTools/Source/Python/GenFds/EfiSection.py
index f8573b5c7d1b..0be176ec8ae1 100644
--- a/BaseTools/Source/Python/GenFds/EfiSection.py
+++ b/BaseTools/Source/Python/GenFds/EfiSection.py
@@ -68,7 +68,7 @@ class EfiSection (EfiSectionClassObject):
             StringData = FfsInf.__ExtendMacro__(self.StringData)
             ModuleNameStr = FfsInf.__ExtendMacro__('$(MODULE_NAME)')
             NoStrip = True
-            if FfsInf.ModuleType in (SUP_MODULE_SEC, SUP_MODULE_PEI_CORE, SUP_MODULE_PEIM) and SectionType in (BINARY_FILE_TYPE_TE, BINARY_FILE_TYPE_PE32):
+            if FfsInf.ModuleType in (SUP_MODULE_SEC, SUP_MODULE_PEI_CORE, SUP_MODULE_PEIM, SUP_MODULE_MM_CORE_STANDALONE) and SectionType in (BINARY_FILE_TYPE_TE, BINARY_FILE_TYPE_PE32):
                 if FfsInf.KeepReloc is not None:
                     NoStrip = FfsInf.KeepReloc
                 elif FfsInf.KeepRelocFromRule is not None:
diff --git a/BaseTools/Source/Python/GenFds/FdfParser.py b/BaseTools/Source/Python/GenFds/FdfParser.py
index e000228d2f6c..de0b166030e7 100644
--- a/BaseTools/Source/Python/GenFds/FdfParser.py
+++ b/BaseTools/Source/Python/GenFds/FdfParser.py
@@ -2589,7 +2589,7 @@ class FdfParser:
     #
     @staticmethod
     def _FileCouldHaveRelocFlag (FileType):
-        if FileType in {SUP_MODULE_SEC, SUP_MODULE_PEI_CORE, SUP_MODULE_PEIM, 'PEI_DXE_COMBO'}:
+        if FileType in {SUP_MODULE_SEC, SUP_MODULE_PEI_CORE, SUP_MODULE_PEIM, SUP_MODULE_MM_CORE_STANDALONE, 'PEI_DXE_COMBO'}:
             return True
         else:
             return False
diff --git a/BaseTools/Source/Python/GenFds/FfsInfStatement.py b/BaseTools/Source/Python/GenFds/FfsInfStatement.py
index c1073c96e9aa..d4c61c074963 100644
--- a/BaseTools/Source/Python/GenFds/FfsInfStatement.py
+++ b/BaseTools/Source/Python/GenFds/FfsInfStatement.py
@@ -901,7 +901,7 @@ class FfsInfStatement(FfsInfStatementClassObject):
     #   @retval string       File name of the generated section file
     #
     def __GenComplexFileSection__(self, Rule, FvChildAddr, FvParentAddr, IsMakefile = False):
-        if self.ModuleType in (SUP_MODULE_SEC, SUP_MODULE_PEI_CORE, SUP_MODULE_PEIM):
+        if self.ModuleType in (SUP_MODULE_SEC, SUP_MODULE_PEI_CORE, SUP_MODULE_PEIM, SUP_MODULE_MM_CORE_STANDALONE):
             if Rule.KeepReloc is not None:
                 self.KeepRelocFromRule = Rule.KeepReloc
         SectFiles = []
-- 
2.17.1



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