[Qemu-devel] [Bug 1065232] Re: qemu-system-arm Crashes on startup on OS X 10.8.2

[Peter Maydell <peter.maydell@linaro.org>]

Thanks. QEMU 1.2 (or earlier) won't work when built with a gcc which is
really an llvm-gcc, because llvm-gcc doesn't support the "tie this
variable to a specific native register" which QEMU requires. (I had
hoped it would give a compile failure, but it seems to just generate
wrong code.) We've actually been able to remove the fixed-register
requirement in QEMU's master git tree, but those changes have not yet
made it into a released version. So for now, I'm afraid you have three
choices:

 (1) compile with a real gcc (not llvm-gcc or clang)
 (2) build QEMU from git master (this is living on the "bleeding edge" but it generally works OK)
 (3) wait for 1.3

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https://bugs.launchpad.net/bugs/1065232

Title:
  qemu-system-arm Crashes on startup on OS X 10.8.2

Status in QEMU:
  New

Bug description:
  On startup qemu-system-arm crashes on this line 9373 of target-arm

          if (unlikely(!QTAILQ_EMPTY(&env->breakpoints))) {
              QTAILQ_FOREACH(bp, &env->breakpoints, entry) {
                  if (bp->pc == dc->pc) {  // <-- CRASH !!!!
                      gen_exception_insn(dc, 0, EXCP_DEBUG);
                      /* Advance PC so that clearing the breakpoint will
                         invalidate this TB.  */
                      dc->pc += 2;
                      goto done_generating;
                      break;
                  }
              }

  What appears to be happening is env is 
  (gdb) print env->breakpoints
  $4 = {
    tqh_first = 0x1f001f001f001f, 
    tqh_last = 0x1f001f001f001f
  }

  which leads to bp being set to
  (gdb) print bp
  $1 = (CPUBreakpoint *) 0x1f001f001f001f

  This looks like a bad address and causes the following statement

  Program received signal EXC_BAD_ACCESS, Could not access memory.
  Reason: 13 at address: 0x0000000000000000

  I am wondering if the env structure is not getting setup correctly?

  I am running the 1.2.0 version of qemu on
  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

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