MIPS LLInt implementation.

https://bugs.webkit.org/show_bug.cgi?id=99706

Patch by Balazs Kilvady <kilvadyb@homejinni.com> on 2013-01-07
Reviewed by Filip Pizlo.

LLInt implementation for MIPS.

Source/JavaScriptCore:

* assembler/MacroAssemblerMIPS.h:
(JSC::MacroAssemblerMIPS::jump):
* dfg/DFGOperations.cpp:
(JSC):
* jit/JITStubs.cpp:
(JSC):
* jit/JITStubs.h:
(JITStackFrame):
* llint/LLIntOfflineAsmConfig.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* offlineasm/backends.rb:
* offlineasm/instructions.rb:
* offlineasm/mips.rb: Added.

Source/WTF:

* wtf/Platform.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@138970 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Conflicts:
	Source/JavaScriptCore/ChangeLog
	Source/JavaScriptCore/jit/JITStubs.h

Change-Id: I1677d54c1641cf60e517772944582c8f387eeb6d
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@digia.com>
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>

3 files changed, 48 insertions, 8 deletions

diff --git a/Source/JavaScriptCore/llint/LLIntOfflineAsmConfig.h b/Source/JavaScriptCore/llint/LLIntOfflineAsmConfig.h
index da2d510b5..157521373 100644
--- a/Source/JavaScriptCore/llint/LLIntOfflineAsmConfig.h
+++ b/Source/JavaScriptCore/llint/LLIntOfflineAsmConfig.h
@@ -38,6 +38,7 @@
 #define OFFLINE_ASM_ARMv7 0
 #define OFFLINE_ASM_X86_64 0
 #define OFFLINE_ASM_ARMv7s 0
+#define OFFLINE_ASM_MIPS 0
 
 #else // !ENABLE(LLINT_C_LOOP)
 
@@ -67,6 +68,12 @@
 #define OFFLINE_ASM_X86_64 0
 #endif
 
+#if CPU(MIPS)
+#define OFFLINE_ASM_MIPS 1
+#else
+#define OFFLINE_ASM_MIPS 0
+#endif
+
 #endif // !ENABLE(LLINT_C_LOOP)
 
 #if USE(JSVALUE64)
@@ -111,4 +118,17 @@
 #define OFFLINE_ASM_VALUE_PROFILER 0
 #endif
 
+#if CPU(MIPS)
+#ifdef WTF_MIPS_PIC
+#define S(x) #x
+#define SX(x) S(x)
+#define OFFLINE_ASM_CPLOAD(reg) \
+    ".set noreorder\n" \
+    ".cpload " SX(reg) "\n" \
+    ".set reorder\n"
+#else
+#define OFFLINE_ASM_CPLOAD(reg)
+#endif
+#endif
+
 #endif // LLIntOfflineAsmConfig_h
diff --git a/Source/JavaScriptCore/llint/LowLevelInterpreter.asm b/Source/JavaScriptCore/llint/LowLevelInterpreter.asm
index 00d5c4f6f..9de48f1f6 100644
--- a/Source/JavaScriptCore/llint/LowLevelInterpreter.asm
+++ b/Source/JavaScriptCore/llint/LowLevelInterpreter.asm
@@ -182,10 +182,8 @@ macro assert(assertion)
 end
 
 macro preserveReturnAddressAfterCall(destinationRegister)
-    if C_LOOP
-        # In our case, we're only preserving the bytecode vPC. 
-        move lr, destinationRegister
-    elsif ARMv7
+    if C_LOOP or ARMv7 or MIPS
+        # In C_LOOP case, we're only preserving the bytecode vPC.
         move lr, destinationRegister
     elsif X86 or X86_64
         pop destinationRegister
@@ -195,10 +193,8 @@ macro preserveReturnAddressAfterCall(destinationRegister)
 end
 
 macro restoreReturnAddressBeforeReturn(sourceRegister)
-    if C_LOOP
-        # In our case, we're only restoring the bytecode vPC. 
-        move sourceRegister, lr
-    elsif ARMv7
+    if C_LOOP or ARMv7 or MIPS
+        # In C_LOOP case, we're only restoring the bytecode vPC.
         move sourceRegister, lr
     elsif X86 or X86_64
         push sourceRegister
diff --git a/Source/JavaScriptCore/llint/LowLevelInterpreter32_64.asm b/Source/JavaScriptCore/llint/LowLevelInterpreter32_64.asm
index 8d5cdf108..9a17985bc 100644
--- a/Source/JavaScriptCore/llint/LowLevelInterpreter32_64.asm
+++ b/Source/JavaScriptCore/llint/LowLevelInterpreter32_64.asm
@@ -113,6 +113,10 @@ macro cCall2(function, arg1, arg2)
         poke arg1, 0
         poke arg2, 1
         call function
+    elsif MIPS
+        move arg1, a0
+        move arg2, a1
+        call function
     elsif C_LOOP
         cloopCallSlowPath function, arg1, arg2
     else
@@ -134,6 +138,12 @@ macro cCall4(function, arg1, arg2, arg3, arg4)
         poke arg3, 2
         poke arg4, 3
         call function
+    elsif MIPS
+        move arg1, a0
+        move arg2, a1
+        move arg3, a2
+        move arg4, a3
+        call function
     elsif C_LOOP
         error
     else
@@ -1818,6 +1828,20 @@ macro nativeCallTrampoline(executableOffsetToFunction)
         call executableOffsetToFunction[t1]
         restoreReturnAddressBeforeReturn(t3)
         loadp JITStackFrame::globalData[sp], t3
+    elsif MIPS
+        loadp JITStackFrame::globalData[sp], t3
+        storep cfr, JSGlobalData::topCallFrame[t3]
+        move t0, t2
+        preserveReturnAddressAfterCall(t3)
+        storep t3, ReturnPC[cfr]
+        move cfr, t0
+        loadi Callee + PayloadOffset[cfr], t1
+        loadp JSFunction::m_executable[t1], t1
+        move t2, cfr
+        move t0, a0
+        call executableOffsetToFunction[t1]
+        restoreReturnAddressBeforeReturn(t3)
+        loadp JITStackFrame::globalData[sp], t3
     elsif C_LOOP
         loadp JITStackFrame::globalData[sp], t3
         storep cfr, JSGlobalData::topCallFrame[t3]