Support for MIPS in architecture independent files....

src/globals.h

Index: src/globals.h
===================================================================
--- src/globals.h	(revision 3220)
+++ src/globals.h	(working copy)
@@ -46,6 +46,9 @@
 #elif defined(__ARMEL__)
 #define V8_HOST_ARCH_ARM 1
 #define V8_HOST_ARCH_32_BIT 1
+#elif defined(_MIPS_ARCH_MIPS32R2)
+#define V8_HOST_ARCH_MIPS 1
+#define V8_HOST_ARCH_32_BIT 1
 #else
 #error Your host architecture was not detected as supported by v8
 #endif
@@ -53,6 +56,8 @@
 #if defined(V8_TARGET_ARCH_X64) || defined(V8_TARGET_ARCH_IA32)
 #define V8_TARGET_CAN_READ_UNALIGNED 1
 #elif V8_TARGET_ARCH_ARM
+#elif V8_TARGET_ARCH_MIPS
+#define V8_TARGET_CAN_READ_UNALIGNED 0

[Søren Thygesen Gjesse, 2010/01/19 22:59:12]

defining V8_TARGET_CAN_READ_UNALIGNED to 0 should not be needed.

[Alexandre, 2010/01/22 23:08:42]

Removed.
On 2010/01/19 22:59:12, Søren Gjesse wrote:

 #else
 #error Your target architecture is not supported by v8
 #endif
@@ -169,7 +174,16 @@
     reinterpret_cast<Address>(V8_UINT64_C(0x1beefdad0beefdad));
 #else
 const Address kZapValue = reinterpret_cast<Address>(0xdeadbeed);
+#ifndef V8_TARGET_ARCH_MIPS
 const Address kHandleZapValue = reinterpret_cast<Address>(0xbaddead);
+#else
+// On mips 0xbaddead is the encoding of jump to 0xeb77ab4.

[Søren Thygesen Gjesse, 2010/01/19 22:59:12]

I don't think this is important. The handle zap value is placed where object
pointers used to be, and will most likely be used as an object value and not
executed code. Getting a segfault should be fine.

[Alexandre, 2010/01/22 23:08:42]

I wrote this in the early development stage. It can safely be removed.
On 2010/01/19 22:59:12, Søren Gjesse wrote:

+// This can be misleading when debugging and developping as we get a segfault
+// instead of an illegal instruction when executing it.
+// The 0b111011 opcode is reserved for future use. Executing this instruction
+// raises a Reserved Instruction Exception error on MIPS not using this opcode.
+const Address kHandleZapValue = reinterpret_cast<Address>(0xec000000);
+#endif
 const Address kFromSpaceZapValue = reinterpret_cast<Address>(0xbeefdad);
 #endif