StandaloneMmPkg/StandaloneMmCoreEntryPoint: relocate StMM core on the fly

Apply PE/COFF fixups when starting up the standalone MM core, so that
it can execute at any address regardless of the link time address.

Note that this requires the PE/COFF image to be emitted with its
relocation section preserved. Special care is taken to ensure that
TE images are dealt with correctly as well.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
Acked-by: Jiewen Yao <Jiewen.yao@intel.com>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>
Tested-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/StandaloneMmPkg/Include/Library/AArch64/StandaloneMmCoreEntryPoint.h b/StandaloneMmPkg/Include/Library/AArch64/StandaloneMmCoreEntryPoint.h
index 494bcf3dc2..0f9a032404 100644
--- a/StandaloneMmPkg/Include/Library/AArch64/StandaloneMmCoreEntryPoint.h
+++ b/StandaloneMmPkg/Include/Library/AArch64/StandaloneMmCoreEntryPoint.h
@@ -71,6 +71,7 @@ typedef RETURN_STATUS (*REGION_PERMISSION_UPDATE_FUNC) (
   and make further progress in the boot process.

 

   @param  ImageContext           Pointer to PE/COFF image context

+  @param  ImageBase              Base of image in memory

   @param  SectionHeaderOffset    Offset of PE/COFF image section header

   @param  NumberOfSections       Number of Sections

   @param  TextUpdater            Function to change code permissions

@@ -82,6 +83,7 @@ EFI_STATUS
 EFIAPI

 UpdateMmFoundationPeCoffPermissions (

   IN  CONST PE_COFF_LOADER_IMAGE_CONTEXT      *ImageContext,

+  IN  EFI_PHYSICAL_ADDRESS                    ImageBase,

   IN  UINT32                                  SectionHeaderOffset,

   IN  CONST  UINT16                           NumberOfSections,

   IN  REGION_PERMISSION_UPDATE_FUNC           TextUpdater,

@@ -98,6 +100,7 @@ UpdateMmFoundationPeCoffPermissions (
 

   @param  TeData                 Pointer to PE/COFF image data

   @param  ImageContext           Pointer to PE/COFF image context

+  @param  ImageBase              Pointer to ImageBase variable

   @param  SectionHeaderOffset    Offset of PE/COFF image section header

   @param  NumberOfSections       Number of Sections

 

@@ -107,6 +110,7 @@ EFIAPI
 GetStandaloneMmCorePeCoffSections (

   IN        VOID                            *TeData,

   IN  OUT   PE_COFF_LOADER_IMAGE_CONTEXT    *ImageContext,

+      OUT   EFI_PHYSICAL_ADDRESS            *ImageBase,

   IN  OUT   UINT32                          *SectionHeaderOffset,

   IN  OUT   UINT16                          *NumberOfSections

   );