From eaf102d78f6888dec0fc2909031ad135b432c400 Mon Sep 17 00:00:00 2001
From: David Anderson <dvander@alliedmods.net>
Date: Wed, 27 Jul 2005 19:43:54 +0000
Subject: [PATCH] Fixed bug where JIT did not work on linux (memory alignment
 issues)

---
 amxmodx/Makefile    | 5 +++--
 amxmodx/amx.cpp     | 8 +++++++-
 amxmodx/modules.cpp | 2 +-
 3 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/amxmodx/Makefile b/amxmodx/Makefile
index 7bb021ea..0882103d 100755
--- a/amxmodx/Makefile
+++ b/amxmodx/Makefile
@@ -17,7 +17,7 @@ OBJECTS = meta_api.cpp CFile.cpp CVault.cpp vault.cpp float.cpp file.cpp modules
 	amxxfile.cpp CLang.cpp md5.cpp emsg.cpp CForward.cpp CPlugin.cpp CModule.cpp \
 	CMenu.cpp util.cpp amx.cpp amxdbg.cpp
 
-LINK = -lz JIT/amxexecn.o JIT/amxjitsn.o
+LINK = -lz 
 
 INCLUDE = -I. -I$(HLSDK) -I$(HLSDK)/dlls -I$(HLSDK)/engine -I$(HLSDK)/game_shared -I$(HLSDK)/game_shared \
 	-I$(MM_ROOT) -Lzlib -I$(HLSDK)/common
@@ -41,7 +41,8 @@ ifeq "$(AMD64)" "true"
 	CFLAGS += -DPAWN_CELL_SIZE=64 -DHAVE_I64 -m64
 else
 	BINARY = $(NAME)_i386.so
-	CFLAGS += -DPAWN_CELL_SIZE=32 
+	OBJECTS += JIT/amxexecn.o JIT/amxjitsn.o
+	CFLAGS += -DPAWN_CELL_SIZE=32 -DJIT -DASM32
 	OPT_FLAGS += -march=i686
 endif
 
diff --git a/amxmodx/amx.cpp b/amxmodx/amx.cpp
index b7944c47..b7f69a73 100755
--- a/amxmodx/amx.cpp
+++ b/amxmodx/amx.cpp
@@ -49,6 +49,8 @@
 #include "osdefs.h"
 #if defined LINUX || defined __FreeBSD__ || defined __OpenBSD__
   #include <sclinux.h>
+  #include <unistd.h>
+  #include <errno.h>
   #if !defined AMX_NODYNALOAD
     #include <dlfcn.h>
   #endif
@@ -1034,9 +1036,13 @@ int AMXAPI amx_Init(AMX *amx,void *program)
       return !VirtualProtect(addr, len, p, &prev);
     }
 
+    #define ALIGN(addr) (addr)
+
   #elif defined LINUX || defined __FreeBSD__ || defined __OpenBSD__
 
     /* Linux already has mprotect() */
+    /* But wants the address aligned! */
+    #define ALIGN(addr) (char *)(((long)addr + sysconf(_SC_PAGESIZE)-1) & ~(sysconf(_SC_PAGESIZE)-1))
 
   #else
 
@@ -1064,7 +1070,7 @@ int AMXAPI amx_InitJIT(AMX *amx, void *reloc_table, void *native_code)
    */
   assert(amx->sysreq_d==0);
 
-  if (mprotect(asm_runJIT, CODESIZE_JIT, PROT_READ | PROT_WRITE | PROT_EXEC) != 0)
+  if (mprotect(ALIGN(asm_runJIT), CODESIZE_JIT, PROT_READ | PROT_WRITE | PROT_EXEC) != 0)
   {
     return AMX_ERR_INIT_JIT;
   }
diff --git a/amxmodx/modules.cpp b/amxmodx/modules.cpp
index 62697978..ac8107e9 100755
--- a/amxmodx/modules.cpp
+++ b/amxmodx/modules.cpp
@@ -392,7 +392,7 @@ int load_amxscript(AMX *amx, void **program, const char *filename, char error[64
 		{
 			delete[] np;
 			delete[] rt;
-			strcpy(error,"Failed to initialize plugin");
+			strcpy(error,"Failed to initialize JIT'd plugin");
 			return (amx->error = AMX_ERR_INIT);
 		}