signals, sparc: Add signal codes for ADI violations

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.aziz@oracle.com>
Cc: Khalid Aziz <khalid@gonehiking.org>
Reviewed-by: Anthony Yznaga <anthony.yznaga@oracle.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 5 insertions, 2 deletions

diff --git a/arch/x86/kernel/signal_compat.c b/arch/x86/kernel/signal_compat.c
index 0d930d8987cc..838a4dc90a6d 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  != 11);
         BUILD_BUG_ON(NSIGFPE  != 13);
-        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 99c902e460c2..a01fd0a92b1b 100644
--- a/include/uapi/asm-generic/siginfo.h
+++ b/include/uapi/asm-generic/siginfo.h
@@ -246,7 +246,10 @@ typedef struct siginfo {
 #else
 # define SEGV_PKUERR    4       /* failed protection key checks */
 #endif
-#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