head	1.4;
access;
symbols
	netbsd-11-0-RELEASE:1.4
	netbsd-11-0-RC7:1.4
	netbsd-11-0-RC6:1.4
	netbsd-11-0-RC5:1.4
	netbsd-11-0-RC4:1.4
	netbsd-11-0-RC3:1.4
	netbsd-11-0-RC2:1.4
	netbsd-11-0-RC1:1.4
	gcc-14-3-0:1.1.1.2
	perseant-exfatfs-base-20250801:1.4
	netbsd-11:1.4.0.4
	netbsd-11-base:1.4
	gcc-12-5-0:1.1.1.2
	perseant-exfatfs-base-20240630:1.4
	gcc-12-4-0:1.1.1.2
	perseant-exfatfs:1.4.0.2
	perseant-exfatfs-base:1.4
	gcc-12-3-0:1.1.1.2
	gcc-10-5-0:1.1.1.1
	gcc-10-4-0:1.1.1.1
	cjep_sun2x:1.3.0.4
	cjep_sun2x-base:1.3
	cjep_staticlib_x-base1:1.3
	cjep_staticlib_x:1.3.0.2
	cjep_staticlib_x-base:1.3
	gcc-10-3-0:1.1.1.1
	FSF:1.1.1;
locks; strict;
comment	@// @;


1.4
date	2023.07.31.01.44.57;	author mrg;	state Exp;
branches;
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1.3
date	2021.04.11.23.54.27;	author mrg;	state dead;
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1.2
date	2021.04.11.00.02.22;	author mrg;	state Exp;
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1.1
date	2021.04.10.22.09.21;	author mrg;	state Exp;
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	1.1.1.1;
next	;
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1.1.1.1
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1.1.1.2
date	2023.07.30.05.20.40;	author mrg;	state Exp;
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next	;
commitid	tk6nV4mbc9nVEMyE;


desc
@@


1.4
log
@make this actually be GCC 12.3.0's libsanitizer.

the libsanitizer we used with GCC 9 and GCC 10 was significantly
ahead of the GCC 9 and GCC 10 provided versions.
@
text
@//===-- sanitizer_stoptheworld_netbsd_libcdep.cpp -------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// See sanitizer_stoptheworld.h for details.
// This implementation was inspired by Markus Gutschke's linuxthreads.cc.
//
// This is a NetBSD variation of Linux stoptheworld implementation
// See sanitizer_stoptheworld_linux_libcdep.cpp for code comments.
//
//===----------------------------------------------------------------------===//

#include "sanitizer_platform.h"

#if SANITIZER_NETBSD

#include "sanitizer_stoptheworld.h"

#include "sanitizer_atomic.h"
#include "sanitizer_platform_limits_posix.h"

#include <sys/types.h>

#include <sys/ptrace.h>
#include <sys/uio.h>
#include <sys/wait.h>

#include <machine/reg.h>

#include <elf.h>
#include <errno.h>
#include <sched.h>
#include <signal.h>
#include <stddef.h>

#define internal_sigaction_norestorer internal_sigaction

#include "sanitizer_common.h"
#include "sanitizer_flags.h"
#include "sanitizer_libc.h"
#include "sanitizer_linux.h"
#include "sanitizer_mutex.h"
#include "sanitizer_placement_new.h"

namespace __sanitizer {

class SuspendedThreadsListNetBSD final : public SuspendedThreadsList {
 public:
  SuspendedThreadsListNetBSD() { thread_ids_.reserve(1024); }

  tid_t GetThreadID(uptr index) const;
  uptr ThreadCount() const;
  bool ContainsTid(tid_t thread_id) const;
  void Append(tid_t tid);

  PtraceRegistersStatus GetRegistersAndSP(uptr index,
                                          InternalMmapVector<uptr> *buffer,
                                          uptr *sp) const;

 private:
  InternalMmapVector<tid_t> thread_ids_;
};

struct TracerThreadArgument {
  StopTheWorldCallback callback;
  void *callback_argument;
  Mutex mutex;
  atomic_uintptr_t done;
  uptr parent_pid;
};

class ThreadSuspender {
 public:
  explicit ThreadSuspender(pid_t pid, TracerThreadArgument *arg)
      : arg(arg), pid_(pid) {
    CHECK_GE(pid, 0);
  }
  bool SuspendAllThreads();
  void ResumeAllThreads();
  void KillAllThreads();
  SuspendedThreadsListNetBSD &suspended_threads_list() {
    return suspended_threads_list_;
  }
  TracerThreadArgument *arg;

 private:
  SuspendedThreadsListNetBSD suspended_threads_list_;
  pid_t pid_;
};

void ThreadSuspender::ResumeAllThreads() {
  int pterrno;
  if (!internal_iserror(internal_ptrace(PT_DETACH, pid_, (void *)(uptr)1, 0),
                        &pterrno)) {
    VReport(2, "Detached from process %d.\n", pid_);
  } else {
    VReport(1, "Could not detach from process %d (errno %d).\n", pid_, pterrno);
  }
}

void ThreadSuspender::KillAllThreads() {
  internal_ptrace(PT_KILL, pid_, nullptr, 0);
}

bool ThreadSuspender::SuspendAllThreads() {
  int pterrno;
  if (internal_iserror(internal_ptrace(PT_ATTACH, pid_, nullptr, 0),
                       &pterrno)) {
    Printf("Could not attach to process %d (errno %d).\n", pid_, pterrno);
    return false;
  }

  int status;
  uptr waitpid_status;
  HANDLE_EINTR(waitpid_status, internal_waitpid(pid_, &status, 0));

  VReport(2, "Attached to process %d.\n", pid_);

#ifdef PT_LWPNEXT
  struct ptrace_lwpstatus pl;
  int op = PT_LWPNEXT;
#else
  struct ptrace_lwpinfo pl;
  int op = PT_LWPINFO;
#endif

  pl.pl_lwpid = 0;

  int val;
  while ((val = internal_ptrace(op, pid_, (void *)&pl, sizeof(pl))) != -1 &&
         pl.pl_lwpid != 0) {
    suspended_threads_list_.Append(pl.pl_lwpid);
    VReport(2, "Appended thread %d in process %d.\n", pl.pl_lwpid, pid_);
  }
  return true;
}

// Pointer to the ThreadSuspender instance for use in signal handler.
static ThreadSuspender *thread_suspender_instance = nullptr;

// Synchronous signals that should not be blocked.
static const int kSyncSignals[] = {SIGABRT, SIGILL,  SIGFPE, SIGSEGV,
                                   SIGBUS,  SIGXCPU, SIGXFSZ};

static void TracerThreadDieCallback() {
  ThreadSuspender *inst = thread_suspender_instance;
  if (inst && stoptheworld_tracer_pid == internal_getpid()) {
    inst->KillAllThreads();
    thread_suspender_instance = nullptr;
  }
}

// Signal handler to wake up suspended threads when the tracer thread dies.
static void TracerThreadSignalHandler(int signum, __sanitizer_siginfo *siginfo,
                                      void *uctx) {
  SignalContext ctx(siginfo, uctx);
  Printf("Tracer caught signal %d: addr=0x%zx pc=0x%zx sp=0x%zx\n", signum,
         ctx.addr, ctx.pc, ctx.sp);
  ThreadSuspender *inst = thread_suspender_instance;
  if (inst) {
    if (signum == SIGABRT)
      inst->KillAllThreads();
    else
      inst->ResumeAllThreads();
    RAW_CHECK(RemoveDieCallback(TracerThreadDieCallback));
    thread_suspender_instance = nullptr;
    atomic_store(&inst->arg->done, 1, memory_order_relaxed);
  }
  internal__exit((signum == SIGABRT) ? 1 : 2);
}

// Size of alternative stack for signal handlers in the tracer thread.
static const int kHandlerStackSize = 8192;

// This function will be run as a cloned task.
static int TracerThread(void *argument) {
  TracerThreadArgument *tracer_thread_argument =
      (TracerThreadArgument *)argument;

  // Check if parent is already dead.
  if (internal_getppid() != tracer_thread_argument->parent_pid)
    internal__exit(4);

  // Wait for the parent thread to finish preparations.
  tracer_thread_argument->mutex.Lock();
  tracer_thread_argument->mutex.Unlock();

  RAW_CHECK(AddDieCallback(TracerThreadDieCallback));

  ThreadSuspender thread_suspender(internal_getppid(), tracer_thread_argument);
  // Global pointer for the signal handler.
  thread_suspender_instance = &thread_suspender;

  // Alternate stack for signal handling.
  InternalMmapVector<char> handler_stack_memory(kHandlerStackSize);
  stack_t handler_stack;
  internal_memset(&handler_stack, 0, sizeof(handler_stack));
  handler_stack.ss_sp = handler_stack_memory.data();
  handler_stack.ss_size = kHandlerStackSize;
  internal_sigaltstack(&handler_stack, nullptr);

  // Install our handler for synchronous signals. Other signals should be
  // blocked by the mask we inherited from the parent thread.
  for (uptr i = 0; i < ARRAY_SIZE(kSyncSignals); i++) {
    __sanitizer_sigaction act;
    internal_memset(&act, 0, sizeof(act));
    act.sigaction = TracerThreadSignalHandler;
    act.sa_flags = SA_ONSTACK | SA_SIGINFO;
    internal_sigaction_norestorer(kSyncSignals[i], &act, 0);
  }

  int exit_code = 0;
  if (!thread_suspender.SuspendAllThreads()) {
    VReport(1, "Failed suspending threads.\n");
    exit_code = 3;
  } else {
    tracer_thread_argument->callback(thread_suspender.suspended_threads_list(),
                                     tracer_thread_argument->callback_argument);
    thread_suspender.ResumeAllThreads();
    exit_code = 0;
  }
  RAW_CHECK(RemoveDieCallback(TracerThreadDieCallback));
  thread_suspender_instance = nullptr;
  atomic_store(&tracer_thread_argument->done, 1, memory_order_relaxed);
  return exit_code;
}

class ScopedStackSpaceWithGuard {
 public:
  explicit ScopedStackSpaceWithGuard(uptr stack_size) {
    stack_size_ = stack_size;
    guard_size_ = GetPageSizeCached();
    // FIXME: Omitting MAP_STACK here works in current kernels but might break
    // in the future.
    guard_start_ =
        (uptr)MmapOrDie(stack_size_ + guard_size_, "ScopedStackWithGuard");
    CHECK(MprotectNoAccess((uptr)guard_start_, guard_size_));
  }
  ~ScopedStackSpaceWithGuard() {
    UnmapOrDie((void *)guard_start_, stack_size_ + guard_size_);
  }
  void *Bottom() const {
    return (void *)(guard_start_ + stack_size_ + guard_size_);
  }

 private:
  uptr stack_size_;
  uptr guard_size_;
  uptr guard_start_;
};

static __sanitizer_sigset_t blocked_sigset;
static __sanitizer_sigset_t old_sigset;

struct ScopedSetTracerPID {
  explicit ScopedSetTracerPID(uptr tracer_pid) {
    stoptheworld_tracer_pid = tracer_pid;
    stoptheworld_tracer_ppid = internal_getpid();
  }
  ~ScopedSetTracerPID() {
    stoptheworld_tracer_pid = 0;
    stoptheworld_tracer_ppid = 0;
  }
};

void StopTheWorld(StopTheWorldCallback callback, void *argument) {
  // Prepare the arguments for TracerThread.
  struct TracerThreadArgument tracer_thread_argument;
  tracer_thread_argument.callback = callback;
  tracer_thread_argument.callback_argument = argument;
  tracer_thread_argument.parent_pid = internal_getpid();
  atomic_store(&tracer_thread_argument.done, 0, memory_order_relaxed);
  const uptr kTracerStackSize = 2 * 1024 * 1024;
  ScopedStackSpaceWithGuard tracer_stack(kTracerStackSize);

  tracer_thread_argument.mutex.Lock();

  internal_sigfillset(&blocked_sigset);
  for (uptr i = 0; i < ARRAY_SIZE(kSyncSignals); i++)
    internal_sigdelset(&blocked_sigset, kSyncSignals[i]);
  int rv = internal_sigprocmask(SIG_BLOCK, &blocked_sigset, &old_sigset);
  CHECK_EQ(rv, 0);
  uptr tracer_pid = internal_clone(TracerThread, tracer_stack.Bottom(),
                                   CLONE_VM | CLONE_FS | CLONE_FILES,
                                   &tracer_thread_argument);
  internal_sigprocmask(SIG_SETMASK, &old_sigset, 0);
  int local_errno = 0;
  if (internal_iserror(tracer_pid, &local_errno)) {
    VReport(1, "Failed spawning a tracer thread (errno %d).\n", local_errno);
    tracer_thread_argument.mutex.Unlock();
  } else {
    ScopedSetTracerPID scoped_set_tracer_pid(tracer_pid);

    tracer_thread_argument.mutex.Unlock();

    while (atomic_load(&tracer_thread_argument.done, memory_order_relaxed) == 0)
      sched_yield();

    for (;;) {
      uptr waitpid_status = internal_waitpid(tracer_pid, nullptr, __WALL);
      if (!internal_iserror(waitpid_status, &local_errno))
        break;
      if (local_errno == EINTR)
        continue;
      VReport(1, "Waiting on the tracer thread failed (errno %d).\n",
              local_errno);
      break;
    }
  }
}

tid_t SuspendedThreadsListNetBSD::GetThreadID(uptr index) const {
  CHECK_LT(index, thread_ids_.size());
  return thread_ids_[index];
}

uptr SuspendedThreadsListNetBSD::ThreadCount() const {
  return thread_ids_.size();
}

bool SuspendedThreadsListNetBSD::ContainsTid(tid_t thread_id) const {
  for (uptr i = 0; i < thread_ids_.size(); i++) {
    if (thread_ids_[i] == thread_id)
      return true;
  }
  return false;
}

void SuspendedThreadsListNetBSD::Append(tid_t tid) {
  thread_ids_.push_back(tid);
}

PtraceRegistersStatus SuspendedThreadsListNetBSD::GetRegistersAndSP(
    uptr index, InternalMmapVector<uptr> *buffer, uptr *sp) const {
  lwpid_t tid = GetThreadID(index);
  pid_t ppid = internal_getppid();
  struct reg regs;
  int pterrno;
  bool isErr =
      internal_iserror(internal_ptrace(PT_GETREGS, ppid, &regs, tid), &pterrno);
  if (isErr) {
    VReport(1,
            "Could not get registers from process %d thread %d (errno %d).\n",
            ppid, tid, pterrno);
    return pterrno == ESRCH ? REGISTERS_UNAVAILABLE_FATAL
                            : REGISTERS_UNAVAILABLE;
  }

  *sp = PTRACE_REG_SP(&regs);
  buffer->resize(RoundUpTo(sizeof(regs), sizeof(uptr)) / sizeof(uptr));
  internal_memcpy(buffer->data(), &regs, sizeof(regs));

  return REGISTERS_AVAILABLE;
}

}  // namespace __sanitizer

#endif
@


1.3
log
@revert sanitizer back to the version we were using with GCC 9, since
that one was already newer than the GCC 10 version.
@
text
@d51 1
a51 1
class SuspendedThreadsListNetBSD : public SuspendedThreadsList {
d60 2
a61 1
  PtraceRegistersStatus GetRegistersAndSP(uptr index, uptr *buffer,
a62 1
  uptr RegisterCount() const;
d71 1
a71 1
  BlockingMutex mutex;
d338 1
a338 1
    uptr index, uptr *buffer, uptr *sp) const {
d354 2
a355 1
  internal_memcpy(buffer, &regs, sizeof(regs));
a359 3
uptr SuspendedThreadsListNetBSD::RegisterCount() const {
  return sizeof(struct reg) / sizeof(uptr);
}
@


1.2
log
@initial merge of GCC 10.3.0.

these three files are not yet finished merging:

gcc/config/rs6000/rs6000.c
libsanitizer/lsan/lsan_allocator.h
libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h

our current GCC 9 sanitizers are newer than GCC 10's still, so that
may take a little to untease, so it's probable that more than
these 2 will need more changes.

rs6000.c has some changes related to ABI and supported functionality
that need to be merged forward.
@
text
@@


1.1
log
@Initial revision
@
text
@d123 4
d128 5
d134 1
a134 2
  pl.pl_lwpid = 0;
  while ((val = ptrace(PT_LWPINFO, pid_, (void *)&pl, sizeof(pl))) != -1 &&
@


1.1.1.1
log
@initial import of GCC 10.3.0.  main changes include:

caveats:
- ABI issue between c++14 and c++17 fixed
- profile mode is removed from libstdc++
- -fno-common is now the default

new features:
- new flags -fallocation-dce, -fprofile-partial-training,
  -fprofile-reproducible, -fprofile-prefix-path, and -fanalyzer
- many new compile and link time optimisations
- enhanced drive optimisations
- openacc 2.6 support
- openmp 5.0 features
- new warnings: -Wstring-compare and -Wzero-length-bounds
- extended warnings: -Warray-bounds, -Wformat-overflow,
  -Wrestrict, -Wreturn-local-addr, -Wstringop-overflow,
  -Warith-conversion, -Wmismatched-tags, and -Wredundant-tags
- some likely C2X features implemented
- more C++20 implemented
- many new arm & intel CPUs known

hundreds of reported bugs are fixed.  full list of changes
can be found at:

   https://gcc.gnu.org/gcc-10/changes.html
@
text
@@


1.1.1.2
log
@initial import of GCC 12.3.0.

major changes in GCC 11 included:

- The default mode for C++ is now -std=gnu++17 instead of -std=gnu++14.
- When building GCC itself, the host compiler must now support C++11,
  rather than C++98.
- Some short options of the gcov tool have been renamed: -i to -j and
  -j to -H.
- ThreadSanitizer improvements.
- Introduce Hardware-assisted AddressSanitizer support.
- For targets that produce DWARF debugging information GCC now defaults
  to DWARF version 5. This can produce up to 25% more compact debug
  information compared to earlier versions.
- Many optimisations.
- The existing malloc attribute has been extended so that it can be
  used to identify allocator/deallocator API pairs. A pair of new
  -Wmismatched-dealloc and -Wmismatched-new-delete warnings are added.
- Other new warnings:
  -Wsizeof-array-div, enabled by -Wall, warns about divisions of two
    sizeof operators when the first one is applied to an array and the
    divisor does not equal the size of the array element.
  -Wstringop-overread, enabled by default, warns about calls to string
    functions reading past the end of the arrays passed to them as
    arguments.
  -Wtsan, enabled by default, warns about unsupported features in
    ThreadSanitizer (currently std::atomic_thread_fence).
- Enchanced warnings:
  -Wfree-nonheap-object detects many more instances of calls to
    deallocation functions with pointers not returned from a dynamic
    memory allocation function.
  -Wmaybe-uninitialized diagnoses passing pointers or references to
    uninitialized memory to functions taking const-qualified arguments.
  -Wuninitialized detects reads from uninitialized dynamically
    allocated memory.
  -Warray-parameter warns about functions with inconsistent array forms.
  -Wvla-parameter warns about functions with inconsistent VLA forms.
- Several new features from the upcoming C2X revision of the ISO C
  standard are supported with -std=c2x and -std=gnu2x.
- Several C++20 features have been implemented.
- The C++ front end has experimental support for some of the upcoming
  C++23 draft.
- Several new C++ warnings.
- Enhanced Arm, AArch64, x86, and RISC-V CPU support.
- The implementation of how program state is tracked within
  -fanalyzer has been completely rewritten with many enhancements.

see https://gcc.gnu.org/gcc-11/changes.html for a full list.

major changes in GCC 12 include:

- An ABI incompatibility between C and C++ when passing or returning
  by value certain aggregates containing zero width bit-fields has
  been discovered on various targets. x86-64, ARM and AArch64
  will always ignore them (so there is a C ABI incompatibility
  between GCC 11 and earlier with GCC 12 or later), PowerPC64 ELFv2
  always take them into account (so there is a C++ ABI
  incompatibility, GCC 4.4 and earlier compatible with GCC 12 or
  later, incompatible with GCC 4.5 through GCC 11). RISC-V has
  changed the handling of these already starting with GCC 10. As
  the ABI requires, MIPS takes them into account handling function
  return values so there is a C++ ABI incompatibility with GCC 4.5
  through 11.
- STABS: Support for emitting the STABS debugging format is
  deprecated and will be removed in the next release. All ports now
  default to emit DWARF (version 2 or later) debugging info or are
  obsoleted.
- Vectorization is enabled at -O2 which is now equivalent to the
  original -O2 -ftree-vectorize -fvect-cost-model=very-cheap.
- GCC now supports the ShadowCallStack sanitizer.
- Support for __builtin_shufflevector compatible with the clang
  language extension was added.
- Support for attribute unavailable was added.
- Support for __builtin_dynamic_object_size compatible with the
  clang language extension was added.
- New warnings:
  -Wbidi-chars warns about potentially misleading UTF-8
    bidirectional control characters.
  -Warray-compare warns about comparisons between two operands of
    array type.
- Some new features from the upcoming C2X revision of the ISO C
  standard are supported with -std=c2x and -std=gnu2x.
- Several C++23 features have been implemented.
- Many C++ enhancements across warnings and -f options.

see https://gcc.gnu.org/gcc-12/changes.html for a full list.
@
text
@d51 1
a51 1
class SuspendedThreadsListNetBSD final : public SuspendedThreadsList {
d60 1
a60 2
  PtraceRegistersStatus GetRegistersAndSP(uptr index,
                                          InternalMmapVector<uptr> *buffer,
d62 1
d71 1
a71 1
  Mutex mutex;
a122 4
#ifdef PT_LWPNEXT
  struct ptrace_lwpstatus pl;
  int op = PT_LWPNEXT;
#else
d124 1
a124 3
  int op = PT_LWPINFO;
#endif

d126 1
a126 3

  int val;
  while ((val = internal_ptrace(op, pid_, (void *)&pl, sizeof(pl))) != -1 &&
d330 1
a330 1
    uptr index, InternalMmapVector<uptr> *buffer, uptr *sp) const {
d346 1
a346 2
  buffer->resize(RoundUpTo(sizeof(regs), sizeof(uptr)) / sizeof(uptr));
  internal_memcpy(buffer->data(), &regs, sizeof(regs));
d351 3
@