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    Subject[PATCH v12 01/11] signals, sparc: Add signal codes for ADI violations
    Date
    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>
    ---
    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 ac057f9b0763..41cf5996a2a9 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 85dc965afd89..e94f03b3ee6f 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
    --
    2.11.0
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