Re: [PATCH 2/2] selftests/powerpc: Test unaligned copy and paste

On Thu, 2016-06-09 at 17:26 +1000, Michael Neuling wrote:

On Thu, 2016-06-09 at 16:02 +1000, Chris Smart wrote:

quoted

Test that an ISA 3.0 compliant machine performing an unaligned copy,
copy_first, paste or paste_last is sent a SIGBUS.

It's probably overkill but we could check in the signal handler that the
sigbus was on the instruction we actually cared about.  ie something like
this in the sig handler for copy first.

static void sig_handler(int signr, siginfo_t *info, void *ucontext)
{
        ucontext_t *ctx = ucontext;
        unsigned int *pc = ctx->uc_mcontext.gp_regs[PT_NIP];

 
You're a hard taskmaster.

For it to build on 32-bit BE, you'll need:

    #if defined(__powerpc64__)
    pc = ctx->uc_mcontext.gp_regs[PT_NIP];
    #else
    pc = ctx->uc_mcontext.uc_regs->gregs[PT_NIP]
    #endif

cheers