SPARC M7 processor introduces a new feature - Application Data
Integrity (ADI). ADI allows MMU to  catch rogue accesses to memory.
When a rogue access occurs, MMU blocks the access and raises an
exception. In response to the exception, kernel sends the offending
task a SIGSEGV with si_code that indicates the nature of exception.
This patch adds three new signal codes specific to ADI feature:

1. ADI is not enabled for the address and task attempted to access
   memory using ADI
2. Task attempted to access memory using wrong ADI tag and caused
   a deferred exception.
3. Task attempted to access memory using wrong ADI tag and caused
   a precise exception.

Signed-off-by: Khalid Aziz <khalid.a...@oracle.com>
Cc: Khalid Aziz <kha...@gonehiking.org>
---
 arch/x86/kernel/signal_compat.c    | 2 +-
 include/uapi/asm-generic/siginfo.h | 5 ++++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/signal_compat.c b/arch/x86/kernel/signal_compat.c
index 71beb28600d4..e6e0b50230c3 100644
--- a/arch/x86/kernel/signal_compat.c
+++ b/arch/x86/kernel/signal_compat.c
@@ -26,7 +26,7 @@ static inline void signal_compat_build_tests(void)
         */
        BUILD_BUG_ON(NSIGILL  != 8);
        BUILD_BUG_ON(NSIGFPE  != 8);
-       BUILD_BUG_ON(NSIGSEGV != 4);
+       BUILD_BUG_ON(NSIGSEGV != 7);
        BUILD_BUG_ON(NSIGBUS  != 5);
        BUILD_BUG_ON(NSIGTRAP != 4);
        BUILD_BUG_ON(NSIGCHLD != 6);
diff --git a/include/uapi/asm-generic/siginfo.h 
b/include/uapi/asm-generic/siginfo.h
index 1abaf62c86fc..24468643ee9d 100644
--- a/include/uapi/asm-generic/siginfo.h
+++ b/include/uapi/asm-generic/siginfo.h
@@ -213,7 +213,10 @@ typedef struct siginfo {
 #define SEGV_ACCERR    (__SI_FAULT|2)  /* invalid permissions for mapped 
object */
 #define SEGV_BNDERR    (__SI_FAULT|3)  /* failed address bound checks */
 #define SEGV_PKUERR    (__SI_FAULT|4)  /* failed protection key checks */
-#define NSIGSEGV       4
+#define SEGV_ACCADI    (__SI_FAULT|5)  /* ADI not enabled for mapped object */
+#define SEGV_ADIDERR   (__SI_FAULT|6)  /* Disrupting MCD error */
+#define SEGV_ADIPERR   (__SI_FAULT|7)  /* Precise MCD exception */
+#define NSIGSEGV       7
 
 /*
  * SIGBUS si_codes
-- 
2.11.0

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