Contribution of PowerPC port.

src/base/platform/platform-posix.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Platform-specific code for POSIX goes here. This is not a platform on its
 // own, but contains the parts which are the same across the POSIX platforms
 // Linux, MacOS, FreeBSD, OpenBSD, NetBSD and QNX.
 
 #include <dlfcn.h>
 #include <errno.h>
@@ skipping 130 matching lines @@
 }
 
 
 int OS::ActivationFrameAlignment() {
 #if V8_TARGET_ARCH_ARM
   // On EABI ARM targets this is required for fp correctness in the
   // runtime system.
   return 8;
 #elif V8_TARGET_ARCH_MIPS
   return 8;
+#elif V8_TARGET_ARCH_PPC

[Sven Panne, 2014/09/01 07:55:17]

No need for a separate case here, just extend the comment in the default below.

+  return 16;
 #else
   // Otherwise we just assume 16 byte alignment, i.e.:
   // - With gcc 4.4 the tree vectorization optimizer can generate code
   //   that requires 16 byte alignment such as movdqa on x86.
   // - Mac OS X and Solaris (64-bit) activation frames must be 16 byte-aligned;
   //   see "Mac OS X ABI Function Call Guide"
   return 16;
 #endif
 }
 
@@ skipping 70 matching lines @@
   return NULL;
 #endif
   uintptr_t raw_addr;
   platform_random_number_generator.Pointer()->NextBytes(&raw_addr,
                                                         sizeof(raw_addr));
 #if V8_TARGET_ARCH_X64
   // Currently available CPUs have 48 bits of virtual addressing.  Truncate
   // the hint address to 46 bits to give the kernel a fighting chance of
   // fulfilling our placement request.
   raw_addr &= V8_UINT64_C(0x3ffffffff000);
+#elif V8_TARGET_ARCH_PPC64
+#if V8_TARGET_ARCH_PPC_BE

[Sven Panne, 2014/09/01 07:55:17]

Please don't mix up the architecture and the endianess, we have separate
#defines for the latter: V8_TARGET_BIG_ENDIAN and V8_TARGET_LITTLE_ENDIAN, these
should be orthogonal to V8_TARGET_ARCH_PPC{,64}.

+  // Big-endian Linux: 44 bits of virtual addressing.
+  raw_addr &= V8_UINT64_C(0x03fffffff000);
+#else
+  // Little-endian Linux: 48 bits of virtual addressing.
+  raw_addr &= V8_UINT64_C(0x3ffffffff000);
+#endif
 #else
   raw_addr &= 0x3ffff000;
 
 # ifdef __sun
   // For our Solaris/illumos mmap hint, we pick a random address in the bottom
   // half of the top half of the address space (that is, the third quarter).
   // Because we do not MAP_FIXED, this will be treated only as a hint -- the
   // system will not fail to mmap() because something else happens to already
   // be mapped at our random address. We deliberately set the hint high enough
   // to get well above the system's break (that is, the heap); Solaris and
@@ skipping 34 matching lines @@
 
 void OS::DebugBreak() {
 #if V8_HOST_ARCH_ARM
   asm("bkpt 0");
 #elif V8_HOST_ARCH_ARM64
   asm("brk 0");
 #elif V8_HOST_ARCH_MIPS
   asm("break");
 #elif V8_HOST_ARCH_MIPS64
   asm("break");
+#elif V8_HOST_ARCH_PPC
+  asm("twge 2,2");
 #elif V8_HOST_ARCH_IA32
 #if defined(__native_client__)
   asm("hlt");
 #else
   asm("int $3");
 #endif  // __native_client__
 #elif V8_HOST_ARCH_X64
   asm("int $3");
 #else
 #error Unsupported host architecture.
@@ skipping 292 matching lines @@
   USE(result);
 }
 
 
 void Thread::Join() {
   pthread_join(data_->thread_, NULL);
 }
 
 
 void Thread::YieldCPU() {
+#if V8_TARGET_ARCH_PPC

[Sven Panne, 2014/09/01 07:55:17]

Huh? How is this related to the *architecture*? Do we have a POSIX platform
without sched_yield? Sounds a bit strange...

+  OS::Sleep(0);
+#else
   int result = sched_yield();
   DCHECK_EQ(0, result);
   USE(result);
+#endif
 }
 
 
 static Thread::LocalStorageKey PthreadKeyToLocalKey(pthread_key_t pthread_key) {
 #if V8_OS_CYGWIN
   // We need to cast pthread_key_t to Thread::LocalStorageKey in two steps
   // because pthread_key_t is a pointer type on Cygwin. This will probably not
   // work on 64-bit platforms, but Cygwin doesn't support 64-bit anyway.
   STATIC_ASSERT(sizeof(Thread::LocalStorageKey) == sizeof(pthread_key_t));
   intptr_t ptr_key = reinterpret_cast<intptr_t>(pthread_key);
@@ skipping 108 matching lines @@
 
 void Thread::SetThreadLocal(LocalStorageKey key, void* value) {
   pthread_key_t pthread_key = LocalKeyToPthreadKey(key);
   int result = pthread_setspecific(pthread_key, value);
   DCHECK_EQ(0, result);
   USE(result);
 }
 
 
 } }  // namespace v8::base