[Qemu-devel] [Bug 1065325] Re: qemu-system-arm hangs on SIGUSR1 on OS X 10.8.2

[Peter Maydell]

I just built QEMU from source (git master commit b6348f29, same gcc as you, 
MacOS 10.8.2), like this:
./configure --target-list=arm-softmmu && make -j2

and the resulting QEMU works for me. I tested with a Cortex-M3 image from here:
https://bugs.launchpad.net/qemu/+bug/1028260/+attachment/3233691/+files/stellaris-test.tar
If you untar that you'll find among other things a .bin file which is a system 
image for the lm3s6965evb board model, which you can run like this:
./arm-softmmu/qemu-system-arm -M lm3s6965evb -kernel 
~/test-images/stellaris-test/qs_ek-lm3s6965.bin

So I think the chances are that it's just that you think that QEMU has
hung because the particular guest image you're trying to run isn't
working. Our M3 model has some known bugs so it's possible that it's
running into one of them.

Other people also seem to have had trouble with FreeRTOS, see for
instance bug 657006. Please can you try with an image that is known to
work under QEMU, so that we can separate out whether this is a problem
with our MacOS support or just that QEMU isn't emulating this board
closely enough for the image you're trying to run?

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https://bugs.launchpad.net/bugs/1065325

Title:
  qemu-system-arm hangs on SIGUSR1 on OS X 10.8.2

Status in QEMU:
  New

Bug description:
  I built the latest version of QEMU

  commit b4ae3cfa57b8c1bdbbd7b7d420971e9171203ade
  Date:   Mon Oct 1 12:34:37 2012 +1000

  My system is:
  Darwin localhost 12.2.0 Darwin Kernel Version 12.2.0: Sat Aug 25 00:48:52 PDT 
2012; root:xnu-2050.18.24~1/RELEASE_X86_64 x86_64

  localhost:qemu oliverks$ gcc -v
  Using built-in specs.
  Target: i686-apple-darwin11
  Configured with: 
/private/var/tmp/llvmgcc42/llvmgcc42-2336.11~28/src/configure 
--disable-checking --enable-werror 
--prefix=/Applications/Xcode.app/Contents/Developer/usr/llvm-gcc-4.2 
--mandir=/share/man --enable-languages=c,objc,c++,obj-c++ 
--program-prefix=llvm- --program-transform-name=/^[cg][^.-]*$/s/$/-4.2/ 
--with-slibdir=/usr/lib --build=i686-apple-darwin11 
--enable-llvm=/private/var/tmp/llvmgcc42/llvmgcc42-2336.11~28/dst-llvmCore/Developer/usr/local
 --program-prefix=i686-apple-darwin11- --host=x86_64-apple-darwin11 
--target=i686-apple-darwin11 --with-gxx-include-dir=/usr/include/c++/4.2.1
  Thread model: posix
  gcc version 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00)

  Shortly after start up I freeze.  I am running the command line

  ./arm-softmmu/qemu-system-arm -M lm3s811evb -kernel
  ../FreeRTOSV7.2.0/FreeRTOS/Demo/CORTEX_LM3S811_GCC/gcc/RTOSDemo.axf

  The hang appears to occur due to this signal being sent

  static void qemu_tcg_init_cpu_signals(void)
  {
      sigset_t set;
      struct sigaction sigact;

      memset(&sigact, 0, sizeof(sigact));
      sigact.sa_handler = cpu_signal;
      sigaction(SIG_IPI, &sigact, NULL); // <-- Signal that hangs system

      sigemptyset(&set);
      sigaddset(&set, SIG_IPI);
      pthread_sigmask(SIG_UNBLOCK, &set, NULL);
  }

  Oliver

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