Reorganize faulting stuff. Differentiate between arch- and OS-specific defines.

- Get rid of ArmMemTools.cpp and rename x64MemTools.cpp to MemTools.cpp.
  ArmMemTools was almost identical to the POSIX part of x64MemTools, and
  the two differences, (a) lack of sigaltstack, which I added to the
  latter recently, and (b) use of r10 to determine the fault address
  instead of info->si_addr (meaning it only works for specifically
  formatted JIT code), I don't think are necessary.  (Plus Android, see
  below.)

- Rename Core/PowerPC/JitCommon/JitBackpatch.h to Core/MachineContext.h.
  It doesn't contain anything JIT-specific anymore, and e.g. locking
  will want to use faulting support regardless of whether any JIT is in
  use.

- Get rid of different definitions of SContext for different
  architectures under __linux__, since this is POSIX.  The exception is
  of course Android being shitty; I moved the workaround definition from
  ArmMemTools.cpp to here.

- Get rid of #ifdefs around EMM::InstallExceptionHandler and just
  provide an empty implementation for unsupported systems (i.e.
  _M_GENERIC really).  Added const bool g_exception_handlers_supported
  for future use; currently exception handlers are only used by the JIT,
  whose use implies non-M_GENERIC, but locking will change that.

- Remove an unnecessary typedef.

Source/Core/Core/ArmMemTools.cpp

@@ -1,78 +0,0 @@
-// Copyright 2013 Dolphin Emulator Project
-// Licensed under GPLv2
-// Refer to the license.txt file included.
-
-
-#include <cstdio>
-#include <signal.h>
-#ifdef ANDROID
-#include <asm/sigcontext.h>
-#else
-#include <execinfo.h>
-#include <sys/ucontext.h>   // Look in here for the context definition.
-#endif
-
-#include "Common/CommonFuncs.h"
-#include "Common/CommonTypes.h"
-#include "Core/MemTools.h"
-#include "Core/HW/Memmap.h"
-#include "Core/PowerPC/JitInterface.h"
-#include "Core/PowerPC/PowerPC.h"
-#include "Core/PowerPC/JitCommon/JitBase.h"
-
-namespace EMM
-{
-#ifdef ANDROID
-typedef struct sigcontext mcontext_t;
-typedef struct ucontext {
-	uint32_t uc_flags;
-	struct ucontext* uc_link;
-	stack_t uc_stack;
-	mcontext_t uc_mcontext;
-	// Other fields are not used by Google Breakpad. Don't define them.
-} ucontext_t;
-#endif
-
-static void sigsegv_handler(int sig, siginfo_t *info, void *raw_context)
-{
-	if (sig != SIGSEGV)
-	{
-		// We are not interested in other signals - handle it as usual.
-		return;
-	}
-	ucontext_t *context = (ucontext_t *)raw_context;
-	int sicode = info->si_code;
-	if (sicode != SEGV_MAPERR && sicode != SEGV_ACCERR)
-	{
-		// Huh? Return.
-		return;
-	}
-
-	// Get all the information we can out of the context.
-	mcontext_t *ctx = &context->uc_mcontext;
-
-	// comex says hello, and is most curious whether this is arm_r10 for a
-	// reason as opposed to si_addr like the x64MemTools.cpp version.  Is there
-	// even a need for this file to be architecture specific?
-	uintptr_t fault_memory_ptr = (uintptr_t)ctx->arm_r10;
-
-	if (!JitInterface::HandleFault(fault_memory_ptr, ctx))
-	{
-		// retry and crash
-		signal(SIGSEGV, SIG_DFL);
-	}
-}
-
-void InstallExceptionHandler()
-{
-	struct sigaction sa;
-	sa.sa_handler = 0;
-	sa.sa_sigaction = &sigsegv_handler;
-	sa.sa_flags = SA_SIGINFO;
-	sigemptyset(&sa.sa_mask);
-	sigaction(SIGSEGV, &sa, nullptr);
-}
-
-void UninstallExceptionHandler() {}
-
-}  // namespace

Source/Core/Core/CMakeLists.txt

@@ -9,6 +9,7 @@ set(SRCS	ActionReplay.cpp
 			ec_wii.cpp
 			GeckoCodeConfig.cpp
 			GeckoCode.cpp
+			MemTools.cpp
 			Movie.cpp
 			NetPlayClient.cpp
 			NetPlayServer.cpp
@@ -179,7 +180,6 @@ set(SRCS	ActionReplay.cpp
 
 if(_M_X86)
 	set(SRCS ${SRCS}
-			x64MemTools.cpp
 			PowerPC/Jit64IL/IR_X86.cpp
 			PowerPC/Jit64IL/JitIL.cpp
 			PowerPC/Jit64IL/JitIL_Tables.cpp
@@ -201,7 +201,6 @@ if(_M_X86)
 			PowerPC/JitCommon/TrampolineCache.cpp)
 elseif(_M_ARM_32)
 	set(SRCS ${SRCS}
-			ArmMemTools.cpp
 			PowerPC/JitArm32/Jit.cpp
 			PowerPC/JitArm32/JitAsm.cpp
 			PowerPC/JitArm32/JitArm_BackPatch.cpp

Source/Core/Core/Core.cpp

@@ -255,10 +255,8 @@ static void CpuThread()
 		g_video_backend->Video_Prepare();
 	}
 
-	#if _M_X86_64 || _M_ARM_32
 	if (_CoreParameter.bFastmem)
 		EMM::InstallExceptionHandler(); // Let's run under memory watch
-	#endif
 
 	if (!s_state_filename.empty())
 		State::LoadAs(s_state_filename);
@@ -283,9 +281,7 @@ static void CpuThread()
 	if (!_CoreParameter.bCPUThread)
 		g_video_backend->Video_Cleanup();
 
-	#if _M_X86_64 || _M_ARM_32
 	EMM::UninstallExceptionHandler();
-	#endif
 
 	return;
 }

Source/Core/Core/Core.vcxproj

@@ -187,6 +187,7 @@
     <ClCompile Include="IPC_HLE\WII_IPC_HLE_Device_usb_kbd.cpp" />
     <ClCompile Include="IPC_HLE\WII_IPC_HLE_WiiMote.cpp" />
     <ClCompile Include="IPC_HLE\WII_Socket.cpp" />
+    <ClCompile Include="MemTools.cpp" />
     <ClCompile Include="Movie.cpp" />
     <ClCompile Include="NetPlayClient.cpp" />
     <ClCompile Include="NetPlayServer.cpp" />
@@ -240,7 +241,6 @@
     <ClCompile Include="PowerPC\SignatureDB.cpp" />
     <ClCompile Include="State.cpp" />
     <ClCompile Include="VolumeHandler.cpp" />
-    <ClCompile Include="x64MemTools.cpp" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="ActionReplay.h" />
@@ -383,6 +383,7 @@
     <ClInclude Include="IPC_HLE\WII_IPC_HLE_Device_usb_kbd.h" />
     <ClInclude Include="IPC_HLE\WII_IPC_HLE_WiiMote.h" />
     <ClInclude Include="IPC_HLE\WII_Socket.h" />
+    <ClInclude Include="MachineContext.h" />
     <ClInclude Include="MemTools.h" />
     <ClInclude Include="Movie.h" />
     <ClInclude Include="NetPlayClient.h" />
@@ -403,7 +404,6 @@
     <ClInclude Include="PowerPC\JitILCommon\IR.h" />
     <ClInclude Include="PowerPC\JitILCommon\JitILBase.h" />
     <ClInclude Include="PowerPC\JitCommon\JitAsmCommon.h" />
-    <ClInclude Include="PowerPC\JitCommon\JitBackpatch.h" />
     <ClInclude Include="PowerPC\JitCommon\JitBase.h" />
     <ClInclude Include="PowerPC\JitCommon\JitCache.h" />
     <ClInclude Include="PowerPC\JitCommon\Jit_Util.h" />

Source/Core/Core/Core.vcxproj.filters

@@ -141,13 +141,13 @@
     <ClCompile Include="CoreParameter.cpp" />
     <ClCompile Include="CoreTiming.cpp" />
     <ClCompile Include="ec_wii.cpp" />
+    <ClCompile Include="MemTools.cpp" />
     <ClCompile Include="Movie.cpp" />
     <ClCompile Include="NetPlayClient.cpp" />
     <ClCompile Include="NetPlayServer.cpp" />
     <ClCompile Include="PatchEngine.cpp" />
     <ClCompile Include="State.cpp" />
     <ClCompile Include="VolumeHandler.cpp" />
-    <ClCompile Include="x64MemTools.cpp" />
     <ClCompile Include="ActionReplay.cpp">
       <Filter>ActionReplay</Filter>
     </ClCompile>
@@ -631,9 +631,6 @@
     <ClCompile Include="PowerPC\JitCommon\JitAsmCommon.cpp">
       <Filter>PowerPC\JitCommon</Filter>
     </ClCompile>
-    <ClCompile Include="PowerPC\JitCommon\JitBackpatch.cpp">
-      <Filter>PowerPC\JitCommon</Filter>
-    </ClCompile>
     <ClCompile Include="PowerPC\JitCommon\JitBase.cpp">
       <Filter>PowerPC\JitCommon</Filter>
     </ClCompile>
@@ -718,6 +715,7 @@
     <ClInclude Include="CoreTiming.h" />
     <ClInclude Include="ec_wii.h" />
     <ClInclude Include="Host.h" />
+    <ClCompile Include="MachineContext.h" />
     <ClInclude Include="MemTools.h" />
     <ClInclude Include="Movie.h" />
     <ClInclude Include="NetPlayClient.h" />
@@ -1176,9 +1174,6 @@
     <ClInclude Include="PowerPC\JitCommon\JitAsmCommon.h">
       <Filter>PowerPC\JitCommon</Filter>
     </ClInclude>
-    <ClInclude Include="PowerPC\JitCommon\JitBackpatch.h">
-      <Filter>PowerPC\JitCommon</Filter>
-    </ClInclude>
     <ClInclude Include="PowerPC\JitCommon\JitBase.h">
       <Filter>PowerPC\JitCommon</Filter>
     </ClInclude>

Source/Core/Core/MachineContext.h

@@ -87,9 +87,24 @@
 	#define CTX_RIP __ss.__rip
 #elif defined(__linux__)
 	#include <signal.h>
-	#if _M_X86_64
+
+	#ifdef ANDROID
+		#include <asm/sigcontext.h>
+		typedef struct sigcontext mcontext_t;
+		typedef struct ucontext
+		{
+			uint32_t uc_flags;
+			struct ucontext* uc_link;
+			stack_t uc_stack;
+			mcontext_t uc_mcontext;
+			// ...
+		} ucontext_t;
+	#else
 		#include <ucontext.h>
-		typedef mcontext_t SContext;
+	#endif
+	typedef mcontext_t SContext;
+
+	#if _M_X86_64
 		#define CTX_RAX gregs[REG_RAX]
 		#define CTX_RBX gregs[REG_RBX]
 		#define CTX_RCX gregs[REG_RCX]
@@ -108,14 +123,11 @@
 		#define CTX_R15 gregs[REG_R15]
 		#define CTX_RIP gregs[REG_RIP]
 	#elif _M_ARM_64
-		typedef struct sigcontext SContext;
 		#define CTX_REG(x) regs[x]
 		#define CTX_SP sp
 		#define CTX_PC pc
 	#elif _M_ARM_32
-		#include <asm/sigcontext.h>
 		// Add others if required.
-		typedef sigcontext SContext;
 		#define CTX_PC  arm_pc
 	#else
 		#warning No context definition for OS

Source/Core/Core/MemTools.cpp

@@ -10,6 +10,7 @@
 #include "Common/Thread.h"
 #include "Common/x64Analyzer.h"
 
+#include "Core/MachineContext.h"
 #include "Core/MemTools.h"
 #include "Core/HW/Memmap.h"
 #include "Core/PowerPC/JitInterface.h"
@@ -23,6 +24,8 @@ namespace EMM
 
 #ifdef _WIN32
 
+const bool g_exception_handlers_supported = true;
+
 LONG NTAPI Handler(PEXCEPTION_POINTERS pPtrs)
 {
 	switch (pPtrs->ExceptionRecord->ExceptionCode)
@@ -91,6 +94,8 @@ void UninstallExceptionHandler() {}
 
 #elif defined(__APPLE__) && !defined(USE_SIGACTION_ON_APPLE)
 
+const bool g_exception_handlers_supported = true;
+
 static void CheckKR(const char* name, kern_return_t kr)
 {
 	if (kr)
@@ -209,7 +214,9 @@ void InstallExceptionHandler()
 
 void UninstallExceptionHandler() {}
 
-#elif defined(_POSIX_VERSION)
+#elif defined(_POSIX_VERSION) && !defined(_M_GENERIC)
+
+const bool g_exception_handlers_supported = true;
 
 static void sigsegv_handler(int sig, siginfo_t *info, void *raw_context)
 {
@@ -275,9 +282,11 @@ void UninstallExceptionHandler()
 		free(old_stack.ss_sp);
 	}
 }
-#else
+#else // _M_GENERIC or unsupported platform
 
-#error Unsupported x86_64 platform! Report this if you support sigaction
+const bool g_exception_handlers_supported = false;
+void InstallExceptionHandler() {}
+void UninstallExceptionHandler() {}
 
 #endif
 

Source/Core/Core/MemTools.h

@@ -9,7 +9,7 @@
 
 namespace EMM
 {
-	typedef u32 EAddr;
+	extern const bool g_exception_handlers_supported;
 	void InstallExceptionHandler();
 	void UninstallExceptionHandler();
 }

Source/Core/Core/PowerPC/Jit64/Jit.h

@@ -37,7 +37,6 @@
 #include "Core/PowerPC/Jit64/JitAsm.h"
 #include "Core/PowerPC/Jit64/JitRegCache.h"
 #include "Core/PowerPC/JitCommon/Jit_Util.h"
-#include "Core/PowerPC/JitCommon/JitBackpatch.h"
 #include "Core/PowerPC/JitCommon/JitBase.h"
 #include "Core/PowerPC/JitCommon/JitCache.h"
 

Source/Core/Core/PowerPC/Jit64IL/JitIL.h

@@ -30,7 +30,6 @@
 #include "Core/PowerPC/PPCTables.h"
 #include "Core/PowerPC/Jit64/JitAsm.h"
 #include "Core/PowerPC/JitCommon/Jit_Util.h"
-#include "Core/PowerPC/JitCommon/JitBackpatch.h"
 #include "Core/PowerPC/JitCommon/JitBase.h"
 #include "Core/PowerPC/JitCommon/JitCache.h"
 #include "Core/PowerPC/JitILCommon/IR.h"

Source/Core/Core/PowerPC/JitArm32/JitArm_BackPatch.cpp

@@ -9,7 +9,6 @@
 
 #include "Core/HW/Memmap.h"
 #include "Core/PowerPC/JitArm32/Jit.h"
-#include "Core/PowerPC/JitCommon/JitBackpatch.h"
 
 using namespace ArmGen;
 

Source/Core/Core/PowerPC/JitCommon/JitBackpatch.cpp

@@ -6,7 +6,6 @@
 
 #include "disasm.h"
 
-#include "Core/PowerPC/JitCommon/JitBackpatch.h"
 #include "Core/PowerPC/JitCommon/JitBase.h"
 
 using namespace Gen;

Source/Core/Core/PowerPC/JitCommon/JitBase.h

@@ -16,6 +16,7 @@
 
 #include "Core/Core.h"
 #include "Core/CoreTiming.h"
+#include "Core/MachineContext.h"
 #include "Core/HW/GPFifo.h"
 #include "Core/HW/Memmap.h"
 #include "Core/PowerPC/CPUCoreBase.h"
@@ -24,7 +25,6 @@
 #include "Core/PowerPC/PPCTables.h"
 #include "Core/PowerPC/JitCommon/Jit_Util.h"
 #include "Core/PowerPC/JitCommon/JitAsmCommon.h"
-#include "Core/PowerPC/JitCommon/JitBackpatch.h"
 #include "Core/PowerPC/JitCommon/JitCache.h"
 #include "Core/PowerPC/JitCommon/TrampolineCache.h"
 

Source/Core/Core/PowerPC/JitInterface.h

@@ -6,8 +6,8 @@
 
 #include <string>
 #include "Common/ChunkFile.h"
+#include "Core/MachineContext.h"
 #include "Core/PowerPC/CPUCoreBase.h"
-#include "Core/PowerPC/JitCommon/JitBackpatch.h"
 
 namespace JitInterface
 {