Revert 150529 (very likely caused http://crbug.com/141707

third_party/mach_override/mach_override.c

 /*******************************************************************************
         mach_override.c
                 Copyright (c) 2003-2009 Jonathan 'Wolf' Rentzsch: <http://rentzsch.com>
                 Some rights reserved: <http://opensource.org/licenses/mit-license.php>
 
         ***************************************************************************/
 
 #include "mach_override.h"
 
 #include <mach-o/dyld.h>
 #include <mach/mach_host.h>
 #include <mach/mach_init.h>
 #include <mach/vm_map.h>
 #include <sys/mman.h>
 
 #include <CoreServices/CoreServices.h>
 
 /**************************
 *       
 *       Constants
 *       
 **************************/
 #pragma mark    -
 #pragma mark    (Constants)
 
-#define kPageSize 4096
 #if defined(__ppc__) || defined(__POWERPC__)
 
 long kIslandTemplate[] = {
         0x9001FFFC,     //      stw             r0,-4(SP)
         0x3C00DEAD,     //      lis             r0,0xDEAD
         0x6000BEEF,     //      ori             r0,r0,0xBEEF
         0x7C0903A6,     //      mtctr   r0
         0x8001FFFC,     //      lwz             r0,-4(SP)
         0x60000000,     //      nop             ; optionally replaced
         0x4E800420      //      bctr
@@ skipping 33 matching lines @@
         0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 
         0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
         // Now the real jump instruction
         0xFF, 0x25, 0x00, 0x00, 0x00, 0x00,
         0x00, 0x00, 0x00, 0x00,
         0x00, 0x00, 0x00, 0x00
 };
 
 #endif
 
+#define kAllocateHigh           1
+#define kAllocateNormal         0
+
 /**************************
 *       
 *       Data Types
 *       
 **************************/
 #pragma mark    -
 #pragma mark    (Data Types)
 
 typedef struct  {
         char    instructions[sizeof(kIslandTemplate)];
+        int             allocatedHigh;
 }       BranchIsland;
 
 /**************************
 *       
 *       Funky Protos
 *       
 **************************/
 #pragma mark    -
 #pragma mark    (Funky Protos)
 
         mach_error_t
 allocateBranchIsland(
                 BranchIsland    **island,
+                int                             allocateHigh,
                 void *originalFunctionAddress);
 
         mach_error_t
 freeBranchIsland(
                 BranchIsland    *island );
 
 #if defined(__ppc__) || defined(__POWERPC__)
         mach_error_t
 setBranchIslandTarget(
                 BranchIsland    *island,
@@ skipping 10 matching lines @@
 void 
 atomic_mov64(
                 uint64_t *targetAddress,
                 uint64_t value );
 
         static Boolean 
 eatKnownInstructions( 
         unsigned char   *code, 
         uint64_t                *newInstruction,
         int                             *howManyEaten, 
-        char                    *originalInstructions,
-        int                             *originalInstructionCount, 
-        uint8_t                 *originalInstructionSizes );
-
-        static void
-fixupInstructions(
-    void                *originalFunction,
-    void                *escapeIsland,
-    void                *instructionsToFix,
-        int                     instructionCount,
-        uint8_t         *instructionSizes );
+        char                    *originalInstructions );
 #endif
 
 /*******************************************************************************
 *       
 *       Interface
 *       
 *******************************************************************************/
 #pragma mark    -
 #pragma mark    (Interface)
 
 #if defined(__i386__) || defined(__x86_64__)
 mach_error_t makeIslandExecutable(void *address) {
         mach_error_t err = err_none;
-    uintptr_t page = (uintptr_t)address & ~(uintptr_t)(kPageSize-1);
+    vm_size_t pageSize;
+    host_page_size( mach_host_self(), &pageSize );
+    uintptr_t page = (uintptr_t)address & ~(uintptr_t)(pageSize-1);
     int e = err_none;
-    e |= mprotect((void *)page, kPageSize, PROT_EXEC | PROT_READ | PROT_WRITE);
-    e |= msync((void *)page, kPageSize, MS_INVALIDATE );
+    e |= mprotect((void *)page, pageSize, PROT_EXEC | PROT_READ | PROT_WRITE);
+    e |= msync((void *)page, pageSize, MS_INVALIDATE );
     if (e) {
         err = err_cannot_override;
     }
     return err;
 }
 #endif
 
     mach_error_t
 mach_override_ptr(
         void *originalFunctionAddress,
     const void *overrideFunctionAddress,
     void **originalFunctionReentryIsland )
 {
         assert( originalFunctionAddress );
         assert( overrideFunctionAddress );
         
         // this addresses overriding such functions as AudioOutputUnitStart()
         // test with modified DefaultOutputUnit project
+#if defined(__x86_64__) || defined(__i386__)
+    for(;;){
+        if(*(unsigned char*)originalFunctionAddress==0xE9)      // jmp .+0x????????
+            originalFunctionAddress=(void*)((char*)originalFunctionAddress+5+*(int32_t *)((char*)originalFunctionAddress+1));
 #if defined(__x86_64__)
-    for(;;){
-        if(*(uint16_t*)originalFunctionAddress==0x25FF)    // jmp qword near [rip+0x????????]
+        else if(*(uint16_t*)originalFunctionAddress==0x25FF)    // jmp qword near [rip+0x????????]
             originalFunctionAddress=*(void**)((char*)originalFunctionAddress+6+*(int32_t *)((uint16_t*)originalFunctionAddress+1));
-        else break;
-    }
 #elif defined(__i386__)
-    for(;;){
-        if(*(uint16_t*)originalFunctionAddress==0x25FF)    // jmp *0x????????
+        else if(*(uint16_t*)originalFunctionAddress==0x25FF)    // jmp *0x????????
             originalFunctionAddress=**(void***)((uint16_t*)originalFunctionAddress+1);
+#endif
         else break;
     }
 #endif
 
         long    *originalFunctionPtr = (long*) originalFunctionAddress;
         mach_error_t    err = err_none;
         
 #if defined(__ppc__) || defined(__POWERPC__)
         //      Ensure first instruction isn't 'mfctr'.
         #define kMFCTRMask                      0xfc1fffff
         #define kMFCTRInstruction       0x7c0903a6
         
         long    originalInstruction = *originalFunctionPtr;
         if( !err && ((originalInstruction & kMFCTRMask) == kMFCTRInstruction) )
                 err = err_cannot_override;
 #elif defined(__i386__) || defined(__x86_64__)
         int eatenCount = 0;
-        int originalInstructionCount = 0;
         char originalInstructions[kOriginalInstructionsSize];
-        uint8_t originalInstructionSizes[kOriginalInstructionsSize];
         uint64_t jumpRelativeInstruction = 0; // JMP
 
         Boolean overridePossible = eatKnownInstructions ((unsigned char *)originalFunctionPtr, 
-                                                                                &jumpRelativeInstruction, &eatenCount, 
-                                                                                originalInstructions, &originalInstructionCount, 
-                                                                                originalInstructionSizes );
+                                                                                &jumpRelativeInstruction, &eatenCount, originalInstructions);
         if (eatenCount > kOriginalInstructionsSize) {
                 //printf ("Too many instructions eaten\n");
                 overridePossible = false;
         }
         if (!overridePossible) err = err_cannot_override;
         if (err) fprintf(stderr, "err = %x %s:%d\n", err, __FILE__, __LINE__);
 #endif
         
         //      Make the original function implementation writable.
         if( !err ) {
                 err = vm_protect( mach_task_self(),
                                 (vm_address_t) originalFunctionPtr, 8, false,
                                 (VM_PROT_ALL | VM_PROT_COPY) );
                 if( err )
                         err = vm_protect( mach_task_self(),
                                         (vm_address_t) originalFunctionPtr, 8, false,
                                         (VM_PROT_DEFAULT | VM_PROT_COPY) );
         }
         if (err) fprintf(stderr, "err = %x %s:%d\n", err, __FILE__, __LINE__);
         
         //      Allocate and target the escape island to the overriding function.
         BranchIsland    *escapeIsland = NULL;
         if( !err )      
-                err = allocateBranchIsland( &escapeIsland, originalFunctionAddress );
+                err = allocateBranchIsland( &escapeIsland, kAllocateHigh, originalFunctionAddress );
                 if (err) fprintf(stderr, "err = %x %s:%d\n", err, __FILE__, __LINE__);
 
         
 #if defined(__ppc__) || defined(__POWERPC__)
         if( !err )
                 err = setBranchIslandTarget( escapeIsland, overrideFunctionAddress, 0 );
         
         //      Build the branch absolute instruction to the escape island.
         long    branchAbsoluteInstruction = 0; // Set to 0 just to silence warning.
         if( !err ) {
@@ skipping 15 matching lines @@
         if (!err) {
                 uint32_t addressOffset = ((char*)escapeIsland - (char*)originalFunctionPtr - 5);
                 addressOffset = OSSwapInt32(addressOffset);
                 
                 jumpRelativeInstruction |= 0xE900000000000000LL; 
                 jumpRelativeInstruction |= ((uint64_t)addressOffset & 0xffffffff) << 24;
                 jumpRelativeInstruction = OSSwapInt64(jumpRelativeInstruction);         
         }
 #endif
         
-        //      Optionally allocate & return the reentry island. This may contain relocated
-        //  jmp instructions and so has all the same addressing reachability requirements
-        //  the escape island has to the original function, except the escape island is
-        //  technically our original function.
+        //      Optionally allocate & return the reentry island.
         BranchIsland    *reentryIsland = NULL;
         if( !err && originalFunctionReentryIsland ) {
-                err = allocateBranchIsland( &reentryIsland, escapeIsland);
+                err = allocateBranchIsland( &reentryIsland, kAllocateHigh, NULL);
                 if( !err )
                         *originalFunctionReentryIsland = reentryIsland;
         }
         
 #if defined(__ppc__) || defined(__POWERPC__)    
         //      Atomically:
         //      o If the reentry island was allocated:
         //              o Insert the original instruction into the reentry island.
         //              o Target the reentry island at the 2nd instruction of the
         //                original function.
@@ skipping 22 matching lines @@
 #elif defined(__i386__) || defined(__x86_64__)
         // Atomically:
         //      o If the reentry island was allocated:
         //              o Insert the original instructions into the reentry island.
         //              o Target the reentry island at the first non-replaced 
         //        instruction of the original function.
         //      o Replace the original first instructions with the jump relative.
         //
         // Note that on i386, we do not support someone else changing the code under our feet
         if ( !err ) {
-                fixupInstructions(originalFunctionPtr, reentryIsland, originalInstructions,
-                                        originalInstructionCount, originalInstructionSizes );
-        
                 if( reentryIsland )
                         err = setBranchIslandTarget_i386( reentryIsland,
                                                                                  (void*) ((char *)originalFunctionPtr+eatenCount), originalInstructions );
                 // try making islands executable before planting the jmp
 #if defined(__x86_64__) || defined(__i386__)
         if( !err )
             err = makeIslandExecutable(escapeIsland);
         if( !err && reentryIsland )
             err = makeIslandExecutable(reentryIsland);
 #endif
@@ skipping 18 matching lines @@
 *       Implementation
 *       
 *******************************************************************************/
 #pragma mark    -
 #pragma mark    (Implementation)
 
 /***************************************************************************//**
         Implementation: Allocates memory for a branch island.
         
         @param  island                  <-      The allocated island.
+        @param  allocateHigh    ->      Whether to allocate the island at the end of the
+                                                                address space (for use with the branch absolute
+                                                                instruction).
         @result                                 <-      mach_error_t
 
         ***************************************************************************/
 
         mach_error_t
 allocateBranchIsland(
                 BranchIsland    **island,
+                int                             allocateHigh,
                 void *originalFunctionAddress)
 {
         assert( island );
-        assert( sizeof( BranchIsland ) <= kPageSize );
+        
+        mach_error_t    err = err_none;
+        
+        if( allocateHigh ) {
+                vm_size_t pageSize;
+                err = host_page_size( mach_host_self(), &pageSize );
+                if( !err ) {
+                        assert( sizeof( BranchIsland ) <= pageSize );
+#if defined(__x86_64__)
+                        vm_address_t first = (uint64_t)originalFunctionAddress & ~(uint64_t)(((uint64_t)1 << 31) - 1) | ((uint64_t)1 << 31); // start in the middle of the page?
+                        vm_address_t last = 0x0;
+#else
+                        vm_address_t first = 0xffc00000;
+                        vm_address_t last = 0xfffe0000;
+#endif
 
-        vm_map_t task_self = mach_task_self();
-        vm_address_t original_address = (vm_address_t) originalFunctionAddress;
-        static vm_address_t last_allocated = 0;
-        vm_address_t address =
-                last_allocated ? last_allocated : original_address;
+                        vm_address_t page = first;
+                        int allocated = 0;
+                        vm_map_t task_self = mach_task_self();
+                        
+                        while( !err && !allocated && page != last ) {
 
-        for (;;) {
-                vm_size_t vmsize = 0;
-                memory_object_name_t object = 0;
-                kern_return_t kr = 0;
-                vm_region_flavor_t flavor = VM_REGION_BASIC_INFO;
-                // Find the page the address is in.
-#if __WORDSIZE == 32
-                vm_region_basic_info_data_t info;
-                mach_msg_type_number_t info_count = VM_REGION_BASIC_INFO_COUNT;
-                kr = vm_region(task_self, &address, &vmsize, flavor,
-                               (vm_region_info_t)&info, &info_count, &object);
+                                err = vm_allocate( task_self, &page, pageSize, 0 );
+                                if( err == err_none )
+                                        allocated = 1;
+                                else if( err == KERN_NO_SPACE ) {
+#if defined(__x86_64__)
+                                        page -= pageSize;
 #else
-                vm_region_basic_info_data_64_t info;
-                mach_msg_type_number_t info_count = VM_REGION_BASIC_INFO_COUNT_64;
-                kr = vm_region_64(task_self, &address, &vmsize, flavor,
-                                  (vm_region_info_t)&info, &info_count, &object);
+                                        page += pageSize;
 #endif
-                if (kr != KERN_SUCCESS)
-                        return kr;
-
-                // Don't underflow. This could be made to work, but this is a
-                // convenient place to give up.
-                assert((address & (kPageSize - 1)) == 0);
-                if (address == 0)
-                        break;
-
-                // Go back one page.
-                vm_address_t new_address = address - kPageSize;
-#if __WORDSIZE == 64
-                if(original_address - new_address - 5 > INT32_MAX)
-                        break;
-#endif
-                address = new_address;
-
-                // Try to allocate this page.
-                kr = vm_allocate(task_self, &address, kPageSize, 0);
-                if (kr == KERN_SUCCESS) {
-                        *island = (BranchIsland*) address;
-                        last_allocated = address;
-                        return err_none;
+                                        err = err_none;
+                                }
+                        }
+                        if( allocated )
+                                *island = (BranchIsland*) page;
+                        else if( !allocated && !err )
+                                err = KERN_NO_SPACE;
                 }
-                if (kr != KERN_NO_SPACE)
-                        return kr;
+        } else {
+                void *block = malloc( sizeof( BranchIsland ) );
+                if( block )
+                        *island = block;
+                else
+                        err = KERN_NO_SPACE;
         }
-
-        return KERN_NO_SPACE;
+        if( !err )
+                (**island).allocatedHigh = allocateHigh;
+        
+        return err;
 }
 
 /***************************************************************************//**
         Implementation: Deallocates memory for a branch island.
         
         @param  island  ->      The island to deallocate.
         @result                 <-      mach_error_t
 
         ***************************************************************************/
 
         mach_error_t
 freeBranchIsland(
                 BranchIsland    *island )
 {
         assert( island );
         assert( (*(long*)&island->instructions[0]) == kIslandTemplate[0] );
-        assert( sizeof( BranchIsland ) <= kPageSize );
-        return vm_deallocate( mach_task_self(), (vm_address_t) island,
-                              kPageSize );
+        assert( island->allocatedHigh );
+        
+        mach_error_t    err = err_none;
+        
+        if( island->allocatedHigh ) {
+                vm_size_t pageSize;
+                err = host_page_size( mach_host_self(), &pageSize );
+                if( !err ) {
+                        assert( sizeof( BranchIsland ) <= pageSize );
+                        err = vm_deallocate(
+                                        mach_task_self(),
+                                        (vm_address_t) island, pageSize );
+                }
+        } else {
+                free( island );
+        }
+        
+        return err;
 }
 
 /***************************************************************************//**
         Implementation: Sets the branch island's target, with an optional
         instruction.
         
         @param  island          ->      The branch island to insert target into.
         @param  branchTo        ->      The address of the target.
         @param  instruction     ->      Optional instruction to execute prior to branch. Set
                                                         to zero for nop.
@@ skipping 81 matching lines @@
 #if defined(__i386__) || defined(__x86_64__)
 // simplistic instruction matching
 typedef struct {
         unsigned int length; // max 15
         unsigned char mask[15]; // sequence of bytes in memory order
         unsigned char constraint[15]; // sequence of bytes in memory order
 }       AsmInstructionMatch;
 
 #if defined(__i386__)
 static AsmInstructionMatch possibleInstructions[] = {
-        { 0x5, {0xFF, 0x00, 0x00, 0x00, 0x00}, {0xE9, 0x00, 0x00, 0x00, 0x00} },        // jmp 0x????????
         { 0x5, {0xFF, 0xFF, 0xFF, 0xFF, 0xFF}, {0x55, 0x89, 0xe5, 0xc9, 0xc3} },        // push %ebp; mov %esp,%ebp; leave; ret
         { 0x1, {0xFF}, {0x90} },                                                        // nop
         { 0x1, {0xFF}, {0x55} },                                                        // push %esp
         { 0x2, {0xFF, 0xFF}, {0x89, 0xE5} },                                            // mov %esp,%ebp
         { 0x1, {0xFF}, {0x53} },                                                        // push %ebx
         { 0x3, {0xFF, 0xFF, 0x00}, {0x83, 0xEC, 0x00} },                                // sub 0x??, %esp
         { 0x6, {0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00}, {0x81, 0xEC, 0x00, 0x00, 0x00, 0x00} },    // sub 0x??, %esp with 32bit immediate
         { 0x1, {0xFF}, {0x57} },                                                        // push %edi
         { 0x1, {0xFF}, {0x56} },                                                        // push %esi
         { 0x2, {0xFF, 0xFF}, {0x31, 0xC0} },                                            // xor %eax, %eax
         { 0x3, {0xFF, 0x4F, 0x00}, {0x8B, 0x45, 0x00} },  // mov $imm(%ebp), %reg
         { 0x3, {0xFF, 0x4C, 0x00}, {0x8B, 0x40, 0x00} },  // mov $imm(%eax-%edx), %reg
         { 0x4, {0xFF, 0xFF, 0xFF, 0x00}, {0x8B, 0x4C, 0x24, 0x00} },  // mov $imm(%esp), %ecx
-        { 0x5, {0xFF, 0x00, 0x00, 0x00, 0x00}, {0xB8, 0x00, 0x00, 0x00, 0x00} },        // mov $imm, %eax
         { 0x0 }
 };
 #elif defined(__x86_64__)
 static AsmInstructionMatch possibleInstructions[] = {
-        { 0x5, {0xFF, 0x00, 0x00, 0x00, 0x00}, {0xE9, 0x00, 0x00, 0x00, 0x00} },        // jmp 0x????????
         { 0x1, {0xFF}, {0x90} },                                                        // nop
         { 0x1, {0xF8}, {0x50} },                                                        // push %rX
         { 0x3, {0xFF, 0xFF, 0xFF}, {0x48, 0x89, 0xE5} },                                // mov %rsp,%rbp
         { 0x4, {0xFF, 0xFF, 0xFF, 0x00}, {0x48, 0x83, 0xEC, 0x00} },                    // sub 0x??, %rsp
         { 0x4, {0xFB, 0xFF, 0x00, 0x00}, {0x48, 0x89, 0x00, 0x00} },                    // move onto rbp
-        { 0x4, {0xFF, 0xFF, 0xFF, 0xFF}, {0x40, 0x0f, 0xbe, 0xce} },                    // movsbl %sil, %ecx
         { 0x2, {0xFF, 0x00}, {0x41, 0x00} },                                            // push %rXX
         { 0x2, {0xFF, 0x00}, {0x85, 0x00} },                                            // test %rX,%rX
         { 0x5, {0xF8, 0x00, 0x00, 0x00, 0x00}, {0xB8, 0x00, 0x00, 0x00, 0x00} },   // mov $imm, %reg
         { 0x3, {0xFF, 0xFF, 0x00}, {0xFF, 0x77, 0x00} },  // pushq $imm(%rdi)
-        { 0x2, {0xFF, 0xFF}, {0x31, 0xC0} },                                            // xor %eax, %eax
-    { 0x2, {0xFF, 0xFF}, {0x89, 0xF8} },                        // mov %edi, %eax
         { 0x0 }
 };
 #endif
 
 static Boolean codeMatchesInstruction(unsigned char *code, AsmInstructionMatch* instruction) 
 {
         Boolean match = true;
         
         size_t i;
         for (i=0; i<instruction->length; i++) {
                 unsigned char mask = instruction->mask[i];
                 unsigned char constraint = instruction->constraint[i];
                 unsigned char codeValue = code[i];
                                 
                 match = ((codeValue & mask) == constraint);
                 if (!match) break;
         }
         
         return match;
 }
 
 #if defined(__i386__) || defined(__x86_64__)
         static Boolean 
 eatKnownInstructions( 
-        unsigned char   *code, 
-        uint64_t                *newInstruction,
-        int                             *howManyEaten, 
-        char                    *originalInstructions,
-        int                             *originalInstructionCount, 
-        uint8_t                 *originalInstructionSizes )
+        unsigned char *code, 
+        uint64_t* newInstruction,
+        int* howManyEaten, 
+        char* originalInstructions )
 {
         Boolean allInstructionsKnown = true;
         int totalEaten = 0;
         unsigned char* ptr = code;
         int remainsToEat = 5; // a JMP instruction takes 5 bytes
-        int instructionIndex = 0;
         
         if (howManyEaten) *howManyEaten = 0;
-        if (originalInstructionCount) *originalInstructionCount = 0;
         while (remainsToEat > 0) {
                 Boolean curInstructionKnown = false;
                 
                 // See if instruction matches one  we know
                 AsmInstructionMatch* curInstr = possibleInstructions;
                 do { 
                         if ((curInstructionKnown = codeMatchesInstruction(ptr, curInstr))) break;
                         curInstr++;
                 } while (curInstr->length > 0);
                 
                 // if all instruction matches failed, we don't know current instruction then, stop here
                 if (!curInstructionKnown) { 
                         allInstructionsKnown = false;
                         fprintf(stderr, "mach_override: some instructions unknown! Need to update mach_override.c\n");
                         break;
                 }
                 
                 // At this point, we've matched curInstr
                 int eaten = curInstr->length;
                 ptr += eaten;
                 remainsToEat -= eaten;
                 totalEaten += eaten;
-                
-                if (originalInstructionSizes) originalInstructionSizes[instructionIndex] = eaten;
-                instructionIndex += 1;
-                if (originalInstructionCount) *originalInstructionCount = instructionIndex;
         }
 
 
         if (howManyEaten) *howManyEaten = totalEaten;
 
         if (originalInstructions) {
                 Boolean enoughSpaceForOriginalInstructions = (totalEaten < kOriginalInstructionsSize);
                 
                 if (enoughSpaceForOriginalInstructions) {
                         memset(originalInstructions, 0x90 /* NOP */, kOriginalInstructionsSize); // fill instructions with NOP
@@ skipping 10 matching lines @@
                 currentFirst64BitsOfCode = OSSwapInt64(currentFirst64BitsOfCode); // back to memory representation
                 currentFirst64BitsOfCode &= 0x0000000000FFFFFFLL; 
                 
                 // keep only last 3 instructions bytes, first 5 will be replaced by JMP instr
                 *newInstruction &= 0xFFFFFFFFFF000000LL; // clear last 3 bytes
                 *newInstruction |= (currentFirst64BitsOfCode & 0x0000000000FFFFFFLL); // set last 3 bytes
         }
 
         return allInstructionsKnown;
 }
-
-        static void
-fixupInstructions(
-    void                *originalFunction,
-    void                *escapeIsland,
-    void                *instructionsToFix,
-        int                     instructionCount,
-        uint8_t         *instructionSizes )
-{
-        int     index;
-        for (index = 0;index < instructionCount;index += 1)
-        {
-                if (*(uint8_t*)instructionsToFix == 0xE9) // 32-bit jump relative
-                {
-                        uint32_t offset = (uintptr_t)originalFunction - (uintptr_t)escapeIsland;
-                        uint32_t *jumpOffsetPtr = (uint32_t*)((uintptr_t)instructionsToFix + 1);
-                        *jumpOffsetPtr += offset;
-                }
-                
-                originalFunction = (void*)((uintptr_t)originalFunction + instructionSizes[index]);
-                escapeIsland = (void*)((uintptr_t)escapeIsland + instructionSizes[index]);
-                instructionsToFix = (void*)((uintptr_t)instructionsToFix + instructionSizes[index]);
-    }
-}
 #endif
 
 #if defined(__i386__)
 __asm(
                         ".text;"
                         ".align 2, 0x90;"
                         "_atomic_mov64:;"
                         "       pushl %ebp;"
                         "       movl %esp, %ebp;"
                         "       pushl %esi;"
@@ skipping 26 matching lines @@
 );
 #elif defined(__x86_64__)
 void atomic_mov64(
                 uint64_t *targetAddress,
                 uint64_t value )
 {
     *targetAddress = value;
 }
 #endif
 #endif