author Geoff Brown <>
Fri, 12 May 2017 15:18:38 -0600
changeset 406366 f0f6bd0a45434bcd6159ae9f7c4f558367332fe7
parent 346589 537f4d1d837aa24f1aa08614b0e1e59c72ce41cd
child 473465 ac1c5c363e29e16c99c87a978d1db82b45a787ed
permissions -rw-r--r--
Bug 1361732 - Mozharness support for a second virtualenv using python3; r=aki Currently Mozharness creates a Python 2.7 virtualenvironment with all the packages needed for Mozharness to run plus any applications that need to execute within it. For Talos, we now need a second Python virtual environment for mitmproxy, however, this package is for Python 3 and not for Python 2 (perhaps it could have worked). In any case, having the ability to support create Python 3 virtual environments will be handy. Specially since the approach of creating virtual environments is not by using 'virtualenv /path/to/venv' but by calling the venv module like 'python3 -m venv /path/to/venv'. The initial implementation only supports a list of modules. The following iteration will support requirement files and other parameters needed for pip and internal pypi hosts. Originally authored by armenzg.

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at */

#ifndef mozilla_LinuxSignal_h
#define mozilla_LinuxSignal_h

namespace mozilla {

#if defined(__arm__)

// Some (old) Linux kernels on ARM have a bug where a signal handler
// can be called without clearing the IT bits in CPSR first. The result
// is that the first few instructions of the handler could be skipped,
// ultimately resulting in crashes. To workaround this bug, the handler
// on ARM is a trampoline that starts with enough NOP instructions, so
// that even if the IT bits are not cleared, only the NOP instructions
// will be skipped over.

template <void (*H)(int, siginfo_t*, void*)>
__attribute__((naked)) void
SignalTrampoline(int aSignal, siginfo_t* aInfo, void* aContext)
  asm volatile (
    "nop; nop; nop; nop"
    : : : "memory");

  asm volatile (
    "b %0"
    : "X"(H)
    : "memory");

# define MOZ_SIGNAL_TRAMPOLINE(h) (mozilla::SignalTrampoline<h>)

#else // __arm__


#endif // __arm__

} // namespace mozilla

#endif // mozilla_LinuxSignal_h