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authorMikkel Krautz <mikkel@krautz.dk>2015-02-06 00:55:43 +0300
committerMikkel Krautz <mikkel@krautz.dk>2015-02-06 01:11:28 +0300
commit403aedb35db95bda81bdaa33b82065ee193f8cf3 (patch)
tree633cc85adb4830c707af25ff1c14ff4aae1624b8 /macx
parent32f327378fa99e0ca76d3511e59217d5f08fcb61 (diff)
Add mach_override as a 3rdparty dep and hook it into the OS X overlay.
Prior versions of mach_override were small (a single file), and we just had its source live in the OS X overlay directory. Newer versions of mach_override use libudis86, so the file count goes up a fair bit. So much so that it doesn't make sense to have it live inside the OS X overlay anymore. Because of that, this commit moves it into 3rdparty.
Diffstat (limited to 'macx')
-rw-r--r--macx/overlay/mach_override.c744
-rw-r--r--macx/overlay/mach_override.h121
-rw-r--r--macx/overlay/overlay.pro9
3 files changed, 7 insertions, 867 deletions
diff --git a/macx/overlay/mach_override.c b/macx/overlay/mach_override.c
deleted file mode 100644
index fc04cc212..000000000
--- a/macx/overlay/mach_override.c
+++ /dev/null
@@ -1,744 +0,0 @@
-/*******************************************************************************
- 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
-};
-
-#define kAddressHi 3
-#define kAddressLo 5
-#define kInstructionHi 10
-#define kInstructionLo 11
-
-#elif defined(__i386__)
-
-#define kOriginalInstructionsSize 16
-
-char kIslandTemplate[] = {
- // kOriginalInstructionsSize nop instructions so that we
- // should have enough space to host original instructions
- 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
- 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
- // Now the real jump instruction
- 0xE9, 0xEF, 0xBE, 0xAD, 0xDE
-};
-
-#define kInstructions 0
-#define kJumpAddress kInstructions + kOriginalInstructionsSize + 1
-#elif defined(__x86_64__)
-
-#define kOriginalInstructionsSize 32
-
-#define kJumpAddress kOriginalInstructionsSize + 6
-
-char kIslandTemplate[] = {
- // kOriginalInstructionsSize nop instructions so that we
- // should have enough space to host original instructions
- 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
- 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
- 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
-
-/**************************
-*
-* Data Types
-*
-**************************/
-#pragma mark -
-#pragma mark (Data Types)
-
-typedef struct {
- char instructions[sizeof(kIslandTemplate)];
-} BranchIsland;
-
-/**************************
-*
-* Funky Protos
-*
-**************************/
-#pragma mark -
-#pragma mark (Funky Protos)
-
- mach_error_t
-allocateBranchIsland(
- BranchIsland **island,
- void *originalFunctionAddress);
-
- mach_error_t
-freeBranchIsland(
- BranchIsland *island );
-
-#if defined(__ppc__) || defined(__POWERPC__)
- mach_error_t
-setBranchIslandTarget(
- BranchIsland *island,
- const void *branchTo,
- long instruction );
-#endif
-
-#if defined(__i386__) || defined(__x86_64__)
-mach_error_t
-setBranchIslandTarget_i386(
- BranchIsland *island,
- const void *branchTo,
- char* instructions );
-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 );
-#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);
- int e = err_none;
- e |= mprotect((void *)page, kPageSize, PROT_EXEC | PROT_READ | PROT_WRITE);
- e |= msync((void *)page, kPageSize, 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__)
- for(;;){
- 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????????
- originalFunctionAddress=**(void***)((uint16_t*)originalFunctionAddress+1);
- 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 );
- 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 );
- 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 ) {
- long escapeIslandAddress = ((long) escapeIsland) & 0x3FFFFFF;
- branchAbsoluteInstruction = 0x48000002 | escapeIslandAddress;
- }
-#elif defined(__i386__) || defined(__x86_64__)
- if (err) fprintf(stderr, "err = %x %s:%d\n", err, __FILE__, __LINE__);
-
- if( !err )
- err = setBranchIslandTarget_i386( escapeIsland, overrideFunctionAddress, 0 );
-
- if (err) fprintf(stderr, "err = %x %s:%d\n", err, __FILE__, __LINE__);
- // Build the jump relative instruction to the escape island
-#endif
-
-
-#if defined(__i386__) || defined(__x86_64__)
- 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.
- BranchIsland *reentryIsland = NULL;
- if( !err && originalFunctionReentryIsland ) {
- err = allocateBranchIsland( &reentryIsland, escapeIsland);
- 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.
- // o Replace the original instruction with the branch absolute.
- if( !err ) {
- int escapeIslandEngaged = false;
- do {
- if( reentryIsland )
- err = setBranchIslandTarget( reentryIsland,
- (void*) (originalFunctionPtr+1), originalInstruction );
- if( !err ) {
- escapeIslandEngaged = CompareAndSwap( originalInstruction,
- branchAbsoluteInstruction,
- (UInt32*)originalFunctionPtr );
- if( !escapeIslandEngaged ) {
- // Someone replaced the instruction out from under us,
- // re-read the instruction, make sure it's still not
- // 'mfctr' and try again.
- originalInstruction = *originalFunctionPtr;
- if( (originalInstruction & kMFCTRMask) == kMFCTRInstruction)
- err = err_cannot_override;
- }
- }
- } while( !err && !escapeIslandEngaged );
- }
-#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
- if ( !err )
- atomic_mov64((uint64_t *)originalFunctionPtr, jumpRelativeInstruction);
- }
-#endif
-
- // Clean up on error.
- if( err ) {
- if( reentryIsland )
- freeBranchIsland( reentryIsland );
- if( escapeIsland )
- freeBranchIsland( escapeIsland );
- }
-
- return err;
-}
-
-/*******************************************************************************
-*
-* Implementation
-*
-*******************************************************************************/
-#pragma mark -
-#pragma mark (Implementation)
-
-/***************************************************************************//**
- Implementation: Allocates memory for a branch island.
-
- @param island <- The allocated island.
- @result <- mach_error_t
-
- ***************************************************************************/
-
- mach_error_t
-allocateBranchIsland(
- BranchIsland **island,
- void *originalFunctionAddress)
-{
- assert( island );
- assert( sizeof( BranchIsland ) <= kPageSize );
-
- 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;
-
- 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);
-#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);
-#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;
- }
- if (kr != KERN_NO_SPACE)
- return kr;
- }
-
- return KERN_NO_SPACE;
-}
-
-/***************************************************************************//**
- 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 );
-}
-
-/***************************************************************************//**
- 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.
- @result <- mach_error_t
-
- ***************************************************************************/
-#if defined(__ppc__) || defined(__POWERPC__)
- mach_error_t
-setBranchIslandTarget(
- BranchIsland *island,
- const void *branchTo,
- long instruction )
-{
- // Copy over the template code.
- bcopy( kIslandTemplate, island->instructions, sizeof( kIslandTemplate ) );
-
- // Fill in the address.
- ((short*)island->instructions)[kAddressLo] = ((long) branchTo) & 0x0000FFFF;
- ((short*)island->instructions)[kAddressHi]
- = (((long) branchTo) >> 16) & 0x0000FFFF;
-
- // Fill in the (optional) instuction.
- if( instruction != 0 ) {
- ((short*)island->instructions)[kInstructionLo]
- = instruction & 0x0000FFFF;
- ((short*)island->instructions)[kInstructionHi]
- = (instruction >> 16) & 0x0000FFFF;
- }
-
- //MakeDataExecutable( island->instructions, sizeof( kIslandTemplate ) );
- msync( island->instructions, sizeof( kIslandTemplate ), MS_INVALIDATE );
-
- return err_none;
-}
-#endif
-
-#if defined(__i386__)
- mach_error_t
-setBranchIslandTarget_i386(
- BranchIsland *island,
- const void *branchTo,
- char* instructions )
-{
-
- // Copy over the template code.
- bcopy( kIslandTemplate, island->instructions, sizeof( kIslandTemplate ) );
-
- // copy original instructions
- if (instructions) {
- bcopy (instructions, island->instructions + kInstructions, kOriginalInstructionsSize);
- }
-
- // Fill in the address.
- int32_t addressOffset = (char *)branchTo - (island->instructions + kJumpAddress + 4);
- *((int32_t *)(island->instructions + kJumpAddress)) = addressOffset;
-
- msync( island->instructions, sizeof( kIslandTemplate ), MS_INVALIDATE );
- return err_none;
-}
-
-#elif defined(__x86_64__)
-mach_error_t
-setBranchIslandTarget_i386(
- BranchIsland *island,
- const void *branchTo,
- char* instructions )
-{
- // Copy over the template code.
- bcopy( kIslandTemplate, island->instructions, sizeof( kIslandTemplate ) );
-
- // Copy original instructions.
- if (instructions) {
- bcopy (instructions, island->instructions, kOriginalInstructionsSize);
- }
-
- // Fill in the address.
- *((uint64_t *)(island->instructions + kJumpAddress)) = (uint64_t)branchTo;
- msync( island->instructions, sizeof( kIslandTemplate ), MS_INVALIDATE );
-
- return err_none;
-}
-#endif
-
-
-#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 )
-{
- 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
- bcopy(code, originalInstructions, totalEaten);
- } else {
- // printf ("Not enough space in island to store original instructions. Adapt the island definition and kOriginalInstructionsSize\n");
- return false;
- }
- }
-
- if (allInstructionsKnown) {
- // save last 3 bytes of first 64bits of codre we'll replace
- uint64_t currentFirst64BitsOfCode = *((uint64_t *)code);
- 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;"
- " pushl %ebx;"
- " pushl %ecx;"
- " pushl %eax;"
- " pushl %edx;"
-
- // atomic push of value to an address
- // we use cmpxchg8b, which compares content of an address with
- // edx:eax. If they are equal, it atomically puts 64bit value
- // ecx:ebx in address.
- // We thus put contents of address in edx:eax to force ecx:ebx
- // in address
- " mov 8(%ebp), %esi;" // esi contains target address
- " mov 12(%ebp), %ebx;"
- " mov 16(%ebp), %ecx;" // ecx:ebx now contains value to put in target address
- " mov (%esi), %eax;"
- " mov 4(%esi), %edx;" // edx:eax now contains value currently contained in target address
- " lock; cmpxchg8b (%esi);" // atomic move.
-
- // restore registers
- " popl %edx;"
- " popl %eax;"
- " popl %ecx;"
- " popl %ebx;"
- " popl %esi;"
- " popl %ebp;"
- " ret"
-);
-#elif defined(__x86_64__)
-void atomic_mov64(
- uint64_t *targetAddress,
- uint64_t value )
-{
- *targetAddress = value;
-}
-#endif
-#endif
diff --git a/macx/overlay/mach_override.h b/macx/overlay/mach_override.h
deleted file mode 100644
index 8b5ddd8a7..000000000
--- a/macx/overlay/mach_override.h
+++ /dev/null
@@ -1,121 +0,0 @@
-/*******************************************************************************
- mach_override.h
- Copyright (c) 2003-2009 Jonathan 'Wolf' Rentzsch: <http://rentzsch.com>
- Some rights reserved: <http://opensource.org/licenses/mit-license.php>
-
- ***************************************************************************/
-
-/***************************************************************************//**
- @mainpage mach_override
- @author Jonathan 'Wolf' Rentzsch: <http://rentzsch.com>
-
- This package, coded in C to the Mach API, allows you to override ("patch")
- program- and system-supplied functions at runtime. You can fully replace
- functions with your implementations, or merely head- or tail-patch the
- original implementations.
-
- Use it by #include'ing mach_override.h from your .c, .m or .mm file(s).
-
- @todo Discontinue use of Carbon's MakeDataExecutable() and
- CompareAndSwap() calls and start using the Mach equivalents, if they
- exist. If they don't, write them and roll them in. That way, this
- code will be pure Mach, which will make it easier to use everywhere.
- Update: MakeDataExecutable() has been replaced by
- msync(MS_INVALIDATE). There is an OSCompareAndSwap in libkern, but
- I'm currently unsure if I can link against it. May have to roll in
- my own version...
- @todo Stop using an entire 4K high-allocated VM page per 28-byte escape
- branch island. Done right, this will dramatically speed up escape
- island allocations when they number over 250. Then again, if you're
- overriding more than 250 functions, maybe speed isn't your main
- concern...
- @todo Add detection of: b, bl, bla, bc, bcl, bcla, bcctrl, bclrl
- first-instructions. Initially, we should refuse to override
- functions beginning with these instructions. Eventually, we should
- dynamically rewrite them to make them position-independent.
- @todo Write mach_unoverride(), which would remove an override placed on a
- function. Must be multiple-override aware, which means an almost
- complete rewrite under the covers, because the target address can't
- be spread across two load instructions like it is now since it will
- need to be atomically updatable.
- @todo Add non-rentry variants of overrides to test_mach_override.
-
- ***************************************************************************/
-
-#ifndef MUMBLE_MACH_OVERRIDE_H_
-#define MUMBLE_MACH_OVERRIDE_H_
-
-#include <sys/types.h>
-#include <mach/error.h>
-
-#ifdef __cplusplus
- extern "C" {
-#endif
-
-/**
- Returned if the function to be overrided begins with a 'mfctr' instruction.
-*/
-#define err_cannot_override (err_local|1)
-
-/************************************************************************************//**
- Dynamically overrides the function implementation referenced by
- originalFunctionAddress with the implentation pointed to by overrideFunctionAddress.
- Optionally returns a pointer to a "reentry island" which, if jumped to, will resume
- the original implementation.
-
- @param originalFunctionAddress -> Required address of the function to
- override (with overrideFunctionAddress).
- @param overrideFunctionAddress -> Required address to the overriding
- function.
- @param originalFunctionReentryIsland <- Optional pointer to pointer to the
- reentry island. Can be NULL.
- @result <- err_cannot_override if the original
- function's implementation begins with
- the 'mfctr' instruction.
-
- ************************************************************************************/
-
- mach_error_t
-mach_override_ptr(
- void *originalFunctionAddress,
- const void *overrideFunctionAddress,
- void **originalFunctionReentryIsland );
-
-/************************************************************************************//**
-
-
- ************************************************************************************/
-
-#ifdef __cplusplus
-
-#define MACH_OVERRIDE( ORIGINAL_FUNCTION_RETURN_TYPE, ORIGINAL_FUNCTION_NAME, ORIGINAL_FUNCTION_ARGS, ERR ) \
- { \
- static ORIGINAL_FUNCTION_RETURN_TYPE (*ORIGINAL_FUNCTION_NAME##_reenter)ORIGINAL_FUNCTION_ARGS; \
- static bool ORIGINAL_FUNCTION_NAME##_overriden = false; \
- class mach_override_class__##ORIGINAL_FUNCTION_NAME { \
- public: \
- static kern_return_t override(void *originalFunctionPtr) { \
- kern_return_t result = err_none; \
- if (!ORIGINAL_FUNCTION_NAME##_overriden) { \
- ORIGINAL_FUNCTION_NAME##_overriden = true; \
- result = mach_override_ptr( (void*)originalFunctionPtr, \
- (void*)mach_override_class__##ORIGINAL_FUNCTION_NAME::replacement, \
- (void**)&ORIGINAL_FUNCTION_NAME##_reenter ); \
- } \
- return result; \
- } \
- static ORIGINAL_FUNCTION_RETURN_TYPE replacement ORIGINAL_FUNCTION_ARGS {
-
-#define END_MACH_OVERRIDE( ORIGINAL_FUNCTION_NAME ) \
- } \
- }; \
- \
- err = mach_override_class__##ORIGINAL_FUNCTION_NAME::override((void*)ORIGINAL_FUNCTION_NAME); \
- }
-
-#endif
-
-#ifdef __cplusplus
- }
-#endif
-#endif
diff --git a/macx/overlay/overlay.pro b/macx/overlay/overlay.pro
index 5215ede69..725df249c 100644
--- a/macx/overlay/overlay.pro
+++ b/macx/overlay/overlay.pro
@@ -19,16 +19,21 @@ TARGET = mumbleoverlay
QMAKE_LFLAGS_PLUGIN += -undefined dynamic_lookup -dynamic
QMAKE_LFLAGS = -framework CoreFoundation
-SOURCES = mach_override.c
+INCLUDEPATH *= ../../3rdparty/mach-override-src
+
+LIBS *= -lmach-override
+
OBJECTIVE_SOURCES = overlay.m
-HEADERS = mach_override.h avail.h
+HEADERS = avail.h
DIST = overlay.plist avail.pl
CONFIG(debug, debug|release) {
+ QMAKE_LIBDIR *= ../../debug
DESTDIR = ../../debug
}
CONFIG(release, debug|release) {
+ QMAKE_LIBDIR *= ../../release
DESTDIR = ../../release
}