Mercurial > jdk8-mips64-public > hotspot / file diff

     1.1 --- a/src/os/bsd/vm/os_bsd.cpp	Wed Jun 05 09:47:27 2013 -0700
     1.2 +++ b/src/os/bsd/vm/os_bsd.cpp	Thu Jun 06 05:56:33 2013 -0700
     1.3 @@ -3030,6 +3030,19 @@
     1.4      sigAct.sa_sigaction = signalHandler;
     1.5      sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
     1.6    }
     1.7 +#if __APPLE__
     1.8 +  // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV
     1.9 +  // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages"
    1.10 +  // if the signal handler declares it will handle it on alternate stack.
    1.11 +  // Notice we only declare we will handle it on alt stack, but we are not
    1.12 +  // actually going to use real alt stack - this is just a workaround.
    1.13 +  // Please see ux_exception.c, method catch_mach_exception_raise for details
    1.14 +  // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c
    1.15 +  if (sig == SIGSEGV) {
    1.16 +    sigAct.sa_flags |= SA_ONSTACK;
    1.17 +  }
    1.18 +#endif
    1.19 +
    1.20    // Save flags, which are set by ours
    1.21    assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
    1.22    sigflags[sig] = sigAct.sa_flags;