[PATCH v3 6/6] Platform/StandaloneMm: build StandaloneMmRpmb for 32bit architectures

["Etienne Carriere" <etienne.carriere@linaro.org>]

Build PlatformStandaloneMmRpmb for ARM architecture (32bit arm machine).
The generated image targets an execution environment similar to AArch64
StMM secure partition in OP-TEE but in 32bit mode.

GCC flag -fno-stack-protector
added. The stack protection code bring
GOT dependencies we prefer avoid when StMM runs in OP-TEE.

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Sami Mujawar <sami.mujawar@arm.com>
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
---
No change since v2

Changes since v1:
- Remove useless duplication of ArmSvcLib loading.
- Move BaseStackCheckLib to generic library classes instead of ARM only.
- include MdePkg/MdeLibs.dsc.inc 
instead of loading
  RegisterFilterLibNull.inf for ARM architecture.
---
 Platform/StandaloneMm/PlatformStandaloneMmPkg/PlatformStandaloneMmRpmb.dsc | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/Platform/StandaloneMm/PlatformStandaloneMmPkg/PlatformStandaloneMmRpmb.dsc b/Platform/StandaloneMm/PlatformStandaloneMmPkg/PlatformStandaloneMmRpmb.dsc
index cb3f1ddf52..33364deb1e 100644
--- a/Platform/StandaloneMm/PlatformStandaloneMmPkg/PlatformStandaloneMmRpmb.dsc
+++ b/Platform/StandaloneMm/PlatformStandaloneMmPkg/PlatformStandaloneMmRpmb.dsc
@@ -16,12 +16,14 @@
   PLATFORM_VERSION               = 1.0
   DSC_SPECIFICATION              = 0x0001001C
   OUTPUT_DIRECTORY               = Build/$(PLATFORM_NAME)
-  SUPPORTED_ARCHITECTURES        = AARCH64
+  SUPPORTED_ARCHITECTURES        = ARM|AARCH64
   BUILD_TARGETS                  = DEBUG|RELEASE|NOOPT
   SKUID_IDENTIFIER               = DEFAULT
   FLASH_DEFINITION               = Platform/StandaloneMm/PlatformStandaloneMmPkg/PlatformStandaloneMmRpmb.fdf
   DEFINE DEBUG_MESSAGE           = TRUE
 
+!include MdePkg/MdeLibs.dsc.inc
+
 ################################################################################
 #
 # Library Class section - list of all Library Classes needed by this Platform.
@@ -39,6 +41,7 @@
   FvLib|StandaloneMmPkg/Library/FvLib/FvLib.inf
   HobLib|StandaloneMmPkg/Library/StandaloneMmCoreHobLib/StandaloneMmCoreHobLib.inf
   IoLib|MdePkg/Library/BaseIoLibIntrinsic/BaseIoLibIntrinsic.inf
+  NULL|MdePkg/Library/BaseStackCheckLib/BaseStackCheckLib.inf
   MemLib|StandaloneMmPkg/Library/StandaloneMmMemLib/StandaloneMmMemLib.inf
   MemoryAllocationLib|StandaloneMmPkg/Library/StandaloneMmCoreMemoryAllocationLib/StandaloneMmCoreMemoryAllocationLib.inf
   PcdLib|MdePkg/Library/BasePcdLibNull/BasePcdLibNull.inf
@@ -68,6 +71,9 @@
   #
   NULL|ArmPkg/Library/CompilerIntrinsicsLib/CompilerIntrinsicsLib.inf
 
+[LibraryClasses.ARM]
+  ArmSoftFloatLib|ArmPkg/Library/ArmSoftFloatLib/ArmSoftFloatLib.inf
+
 [LibraryClasses.common.MM_STANDALONE]
   HobLib|StandaloneMmPkg/Library/StandaloneMmHobLib/StandaloneMmHobLib.inf
   MmServicesTableLib|MdePkg/Library/StandaloneMmServicesTableLib/StandaloneMmServicesTableLib.inf
@@ -160,3 +166,7 @@
 [BuildOptions.AARCH64]
 GCC:*_*_*_DLINK_FLAGS = -z common-page-size=0x1000 -march=armv8-a+nofp
 GCC:*_*_*_CC_FLAGS = -mstrict-align
+
+[BuildOptions.ARM]
+GCC:*_*_*_DLINK_FLAGS = -z common-page-size=0x1000 -march=armv7-a
+GCC:*_*_*_CC_FLAGS = -fno-stack-protector
-- 
2.17.1