[PATCH v10 01/10] signals, sparc: Add signal codes for ADI violations

[Khalid Aziz]

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 Ttag and caused
   a precise exception.

Signed-off-by: Khalid Aziz <khalid.a...@oracle.com>
Cc: Khalid Aziz <kha...@gonehiking.org>
---
v10:
        - Updated si_code definitions to match other definitions

 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 8c6da1a643da..20be1bc923f9 100644
--- a/arch/x86/kernel/signal_compat.c
+++ b/arch/x86/kernel/signal_compat.c
@@ -27,7 +27,7 @@ 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 e447283b8f52..279b7c0d2977 100644
--- a/include/uapi/asm-generic/siginfo.h
+++ b/include/uapi/asm-generic/siginfo.h
@@ -202,7 +202,10 @@ typedef struct siginfo {
 #define SEGV_ACCERR    2       /* invalid permissions for mapped object */
 #define SEGV_BNDERR    3       /* failed address bound checks */
 #define SEGV_PKUERR    4       /* failed protection key checks */
-#define NSIGSEGV       4
+#define SEGV_ACCADI    5       /* ADI not enabled for mapped object */
+#define SEGV_ADIDERR   6       /* Disrupting MCD error */
+#define SEGV_ADIPERR   7       /* Precise MCD exception */
+#define NSIGSEGV       7
 
 /*
  * SIGBUS si_codes
-- 
2.11.0