MdePkg: Add Stack Cookie Interrupt Vector PCD

This patch adds a PCD allowing a platform to specify
the interrupt vector to trigger on a stack check
failure. On x86, this is an offset into the IDT.
On ARM/AARCH64, this triggers a software interrupt
that can be decoded to indicate this was a stack
check failure.

Signed-off-by: Oliver Smith-Denny <osde@linux.microsoft.com>

diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
index d36bd2eda37e60d0dc5223ae392ccd5f2e2f4eb0..8d5947fc9e9a165f3c13eb5a91e39289f5966469 100644 (file)
--- a/MdePkg/MdePkg.dec
+++ b/MdePkg/MdePkg.dec
@@ -2259,6 +2259,9 @@
   # @Prompt Speculation Barrier Type.\r
   gEfiMdePkgTokenSpaceGuid.PcdSpeculationBarrierType|0x01|UINT8|0x30001018\r
 \r
+  ## This PCD specifies the interrupt vector for stack cookie check failures\r
+  gEfiMdePkgTokenSpaceGuid.PcdStackCookieExceptionVector|0x42|UINT8|0x30001019\r
+\r
 [PcdsFixedAtBuild,PcdsPatchableInModule]\r
   ## Indicates the maximum length of unicode string used in the following\r
   #  BaseLib functions: StrLen(), StrSize(), StrCmp(), StrnCmp(), StrCpy(), StrnCpy()<BR><BR>\r