Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 214 insertions, 0 deletions

diff --git a/js/src/util/NativeStack.cpp b/js/src/util/NativeStack.cpp
new file mode 100644
index 0000000000..4e4189d397
--- /dev/null
+++ b/js/src/util/NativeStack.cpp
@@ -0,0 +1,214 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * 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 http://mozilla.org/MPL/2.0/. */
+
+#include "util/NativeStack.h"
+
+#include "mozilla/Assertions.h"  // MOZ_ASSERT, MOZ_RELEASE_ASSERT, MOZ_CRASH
+
+#ifdef XP_WIN
+#  include "util/WindowsWrapper.h"
+#elif defined(__wasi__)
+// Nothing
+#elif defined(XP_DARWIN) || defined(DARWIN) || defined(XP_UNIX)
+#  include <pthread.h>
+#  if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
+#    include <pthread_np.h>
+#  endif
+#  if defined(SOLARIS) || defined(AIX)
+#    include <ucontext.h>
+#  endif
+#  if defined(ANDROID) && !defined(__aarch64__)
+#    include <sys/types.h>
+#    include <unistd.h>
+#  endif
+#  if defined(XP_LINUX) && !defined(ANDROID) && defined(__GLIBC__)
+#    include <dlfcn.h>
+#    include <sys/syscall.h>
+#    include <sys/types.h>
+#    include <unistd.h>
+#    define gettid() static_cast<pid_t>(syscall(__NR_gettid))
+#  endif
+#else
+#  error "Unsupported platform"
+#endif
+
+#include "js/friend/StackLimits.h"  // JS_STACK_GROWTH_DIRECTION
+
+#if defined(XP_WIN)
+
+void* js::GetNativeStackBaseImpl() {
+  PNT_TIB pTib = reinterpret_cast<PNT_TIB>(NtCurrentTeb());
+  return static_cast<void*>(pTib->StackBase);
+}
+
+#elif defined(SOLARIS)
+
+static_assert(JS_STACK_GROWTH_DIRECTION < 0);
+
+void* js::GetNativeStackBaseImpl() {
+  stack_t st;
+  stack_getbounds(&st);
+  return static_cast<char*>(st.ss_sp) + st.ss_size;
+}
+
+#elif defined(AIX)
+
+static_assert(JS_STACK_GROWTH_DIRECTION < 0);
+
+void* js::GetNativeStackBaseImpl() {
+  ucontext_t context;
+  getcontext(&context);
+  return static_cast<char*>(context.uc_stack.ss_sp) + context.uc_stack.ss_size;
+}
+
+#elif defined(XP_LINUX) && !defined(ANDROID) && defined(__GLIBC__)
+void* js::GetNativeStackBaseImpl() {
+  // On the main thread, get stack base from glibc's __libc_stack_end rather
+  // than pthread APIs to avoid filesystem calls /proc/self/maps.  Non-main
+  // threads spawned with pthreads can read this information directly from their
+  // pthread struct, but the main thread must go parse /proc/self/maps to figure
+  // the mapped stack address space ranges.  We want to avoid reading from
+  // /proc/ so that firefox can run in sandboxed environments where /proc may
+  // not be mounted.
+  if (gettid() == getpid()) {
+    void** pLibcStackEnd = (void**)dlsym(RTLD_DEFAULT, "__libc_stack_end");
+
+    // If __libc_stack_end is not found, architecture specific frame pointer
+    // hopping will need to be implemented.
+    MOZ_RELEASE_ASSERT(
+        pLibcStackEnd,
+        "__libc_stack_end unavailable, unable to setup stack range for JS");
+    void* stackBase = *pLibcStackEnd;
+    MOZ_RELEASE_ASSERT(
+        stackBase, "invalid stack base, unable to setup stack range for JS");
+
+    // We don't need to fix stackBase, as it already roughly points to beginning
+    // of the stack
+    return stackBase;
+  }
+
+  // Non-main threads have the required info stored in memory, so no filesystem
+  // calls are made.
+  pthread_t thread = pthread_self();
+  pthread_attr_t sattr;
+  pthread_attr_init(&sattr);
+  pthread_getattr_np(thread, &sattr);
+
+  // stackBase will be the *lowest* address on all architectures.
+  void* stackBase = nullptr;
+  size_t stackSize = 0;
+  int rc = pthread_attr_getstack(&sattr, &stackBase, &stackSize);
+  if (rc) {
+    MOZ_CRASH(
+        "call to pthread_attr_getstack failed, unable to setup stack range for "
+        "JS");
+  }
+  MOZ_RELEASE_ASSERT(stackBase,
+                     "invalid stack base, unable to setup stack range for JS");
+  pthread_attr_destroy(&sattr);
+
+#  if JS_STACK_GROWTH_DIRECTION > 0
+  return stackBase;
+#  else
+  return static_cast<char*>(stackBase) + stackSize;
+#  endif
+}
+
+#elif defined(__wasi__)
+
+// Since we rearrange the layout for wasi via --stack-first flag for the linker
+// the final layout is: 0x00 | <- stack | data | heap -> |.
+static void* const NativeStackBase = __builtin_frame_address(0);
+
+void* js::GetNativeStackBaseImpl() {
+  MOZ_ASSERT(JS_STACK_GROWTH_DIRECTION < 0);
+  return NativeStackBase;
+}
+
+#else  // __wasi__
+
+void* js::GetNativeStackBaseImpl() {
+  pthread_t thread = pthread_self();
+#  if defined(XP_DARWIN) || defined(DARWIN)
+  return pthread_get_stackaddr_np(thread);
+
+#  else
+  pthread_attr_t sattr;
+  pthread_attr_init(&sattr);
+#    if defined(__OpenBSD__)
+  stack_t ss;
+#    elif defined(PTHREAD_NP_H) || defined(_PTHREAD_NP_H_) || defined(NETBSD)
+  /* e.g. on FreeBSD 4.8 or newer, neundorf@kde.org */
+  pthread_attr_get_np(thread, &sattr);
+#    else
+  /*
+   * FIXME: this function is non-portable;
+   * other POSIX systems may have different np alternatives
+   */
+  pthread_getattr_np(thread, &sattr);
+#    endif
+
+  void* stackBase = 0;
+  size_t stackSize = 0;
+  int rc;
+#    if defined(__OpenBSD__)
+  rc = pthread_stackseg_np(pthread_self(), &ss);
+  stackBase = (void*)((size_t)ss.ss_sp - ss.ss_size);
+  stackSize = ss.ss_size;
+#    elif defined(ANDROID) && !defined(__aarch64__)
+  if (gettid() == getpid()) {
+    // bionic's pthread_attr_getstack prior to API 21 doesn't tell the truth
+    // for the main thread (see bug 846670). So we scan /proc/self/maps to
+    // find the segment which contains the stack.
+    rc = -1;
+
+    // Put the string on the stack, otherwise there is the danger that it
+    // has not been decompressed by the the on-demand linker. Bug 1165460.
+    //
+    // The volatile keyword should stop the compiler from trying to omit
+    // the stack copy in the future (hopefully).
+    volatile char path[] = "/proc/self/maps";
+    FILE* fs = fopen((const char*)path, "r");
+
+    if (fs) {
+      char line[100];
+      unsigned long stackAddr = (unsigned long)&sattr;
+      while (fgets(line, sizeof(line), fs) != nullptr) {
+        unsigned long stackStart;
+        unsigned long stackEnd;
+        if (sscanf(line, "%lx-%lx ", &stackStart, &stackEnd) == 2 &&
+            stackAddr >= stackStart && stackAddr < stackEnd) {
+          stackBase = (void*)stackStart;
+          stackSize = stackEnd - stackStart;
+          rc = 0;
+          break;
+        }
+      }
+      fclose(fs);
+    }
+  } else {
+    // For non main-threads pthread allocates the stack itself so it tells
+    // the truth.
+    rc = pthread_attr_getstack(&sattr, &stackBase, &stackSize);
+  }
+#    else
+  rc = pthread_attr_getstack(&sattr, &stackBase, &stackSize);
+#    endif
+  if (rc) {
+    MOZ_CRASH();
+  }
+  MOZ_ASSERT(stackBase);
+  pthread_attr_destroy(&sattr);
+
+#    if JS_STACK_GROWTH_DIRECTION > 0
+  return stackBase;
+#    else
+  return static_cast<char*>(stackBase) + stackSize;
+#    endif
+#  endif
+}
+
+#endif /* !XP_WIN */