Add support for the QNX operating system.

src/cpu.cc

Index: src/cpu.cc
diff --git a/src/cpu.cc b/src/cpu.cc
index 2bf51a7f6c09498186e602fa1e8c3276af31883f..8a9aa970057f8271f0a079d01f282425c29e05be 100644
--- a/src/cpu.cc
+++ b/src/cpu.cc
@@ -33,6 +33,9 @@
 #if V8_OS_POSIX
 #include <unistd.h>  // sysconf()
 #endif
+#if V8_OS_QNX
+#include <sys/syspage.h>  // cpuinfo
+#endif
 
 #include <algorithm>
 #include <cctype>
@@ -78,6 +81,8 @@ static V8_INLINE void __cpuid(int cpu_info[4], int info_type) {
 
 #elif V8_HOST_ARCH_ARM || V8_HOST_ARCH_MIPS
 
+#if V8_OS_LINUX
+
 #if V8_HOST_ARCH_ARM
 
 // See <uapi/asm/hwcap.h> kernel header.
@@ -249,6 +254,8 @@ static bool HasListItem(const char* list, const char* item) {
   return false;
 }
 
+#endif  // V8_OS_LINUX
+
 #endif  // V8_HOST_ARCH_IA32 || V8_HOST_ARCH_X64
 
 CPU::CPU() : stepping_(0),
@@ -328,7 +335,11 @@ CPU::CPU() : stepping_(0),
     has_sahf_ = (cpu_info[2] & 0x00000001) != 0;
 #endif
   }
+
 #elif V8_HOST_ARCH_ARM
+
+#if V8_OS_LINUX
+
   CPUInfo cpu_info;
 
   // Extract implementor from the "CPU implementer" field.
@@ -438,7 +449,34 @@ CPU::CPU() : stepping_(0),
 
   // We don't support any FPUs other than VFP.
   has_fpu_ = has_vfp_;
+
+#elif V8_OS_QNX
+
+  uint32_t cpu_flags = SYSPAGE_ENTRY(cpuinfo)->flags;
+  if (cpu_flags & ARM_CPU_FLAG_V7) {
+    architecture_ = 7;
+    has_thumbee_ = true;
+  } else if (cpu_flags & ARM_CPU_FLAG_V6) {
+    architecture_ = 6;
+    // QNX doesn't say if ThumbEE is available.
+    // Assume false for the architectures older than ARMv7.
+  }
+  ASSERT(architecture_ >= 6);
+  has_fpu_ = (cpu_flags & CPU_FLAG_FPU) != 0;
+  has_vfp_ = has_fpu_;
+  if (cpu_flags & ARM_CPU_FLAG_NEON) {
+    has_neon_ = true;
+    has_vfp3_ = has_vfp_;
+#ifdef ARM_CPU_FLAG_VFP_D32
+    has_vfp3_d32_ = (cpu_flags & ARM_CPU_FLAG_VFP_D32) != 0;
+#endif
+  }
+  has_idiva_ = (cpu_flags & ARM_CPU_FLAG_IDIV) != 0;
+
+#endif  // V8_OS_LINUX
+
 #elif V8_HOST_ARCH_MIPS
+
   // Simple detection of FPU at runtime for Linux.
   // It is based on /proc/cpuinfo, which reveals hardware configuration
   // to user-space applications.  According to MIPS (early 2010), no similar
@@ -448,6 +486,7 @@ CPU::CPU() : stepping_(0),
   char* cpu_model = cpu_info.ExtractField("cpu model");
   has_fpu_ = HasListItem(cpu_model, "FPU");
   delete[] cpu_model;
+
 #endif
 }