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SectionContents.mm
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SectionContents.mm
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/*
* SectionContents.mm
* MachOView
*
* Created by psaghelyi on 15/09/2010.
*
*/
#import "Common.h"
#import "SectionContents.h"
#import "CRTFootPrints.h"
#import "ReadWrite.h"
#import "DataController.h"
#include "disasm.h"
#define TAB_WIDTH 10
using namespace std;
//============================================================================
@implementation MachOLayout (SectionContents)
//-----------------------------------------------------------------------------
- (MVNode *)createPointersNode:(MVNode *)parent
caption:(NSString *)caption
location:(uint32_t)location
length:(uint32_t)length
{
MVNodeSaver nodeSaver;
MVNode * node = [parent insertChildWithDetails:caption location:location length:length saver:nodeSaver];
NSRange range = NSMakeRange(location,0);
NSString * lastReadHex;
while (NSMaxRange(range) < location + length)
{
uint32_t ptr = [dataController read_uint32:range lastReadHex:&lastReadHex];
NSString * symbolName = [NSString stringWithFormat:@"%@->%@",
[self findSymbolAtRVA:[self fileOffsetToRVA:range.location]],
[self findSymbolAtRVA:ptr]];
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"Pointer"
:symbolName];
[node.details setAttributes:MVMetaDataAttributeName,symbolName,nil];
[symbolNames setObject:symbolName
forKey:[NSNumber numberWithUnsignedLong:[self fileOffsetToRVA:range.location]]];
}
return node;
}
//-----------------------------------------------------------------------------
- (MVNode *)createPointers64Node:(MVNode *)parent
caption:(NSString *)caption
location:(uint32_t)location
length:(uint32_t)length
{
MVNodeSaver nodeSaver;
MVNode * node = [parent insertChildWithDetails:caption location:location length:length saver:nodeSaver];
NSRange range = NSMakeRange(location,0);
NSString * lastReadHex;
while (NSMaxRange(range) < location + length)
{
uint64_t ptr = [dataController read_uint64:range lastReadHex:&lastReadHex];
NSString * symbolName = [NSString stringWithFormat:@"%@->%@",
[self findSymbolAtRVA64:[self fileOffsetToRVA64:range.location]],
[self findSymbolAtRVA64:ptr]];
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"Pointer"
:symbolName];
[node.details setAttributes:MVMetaDataAttributeName,symbolName,nil];
[symbolNames setObject:symbolName
forKey:[NSNumber numberWithUnsignedLongLong:[self fileOffsetToRVA64:range.location]]];
}
return node;
}
//-----------------------------------------------------------------------------
-(MVNode *)createCStringsNode:(MVNode *)parent
caption:(NSString *)caption
location:(uint32_t)location
length:(uint32_t)length
{
MVNodeSaver nodeSaver;
MVNode * node = [parent insertChildWithDetails:caption location:location length:length saver:nodeSaver];
NSRange range = NSMakeRange(location,0);
NSString * lastReadHex;
while (NSMaxRange(range) < location + length)
{
NSString * symbolName = [dataController read_string:range lastReadHex:&lastReadHex];
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:[NSString stringWithFormat:@"CString (length:%lu)", [symbolName length]]
:symbolName];
[node.details setAttributes:MVMetaDataAttributeName,symbolName,nil];
// fill in lookup table with C Strings
if ([self is64bit] == NO)
{
uint32_t rva = [self fileOffsetToRVA:range.location];
[symbolNames setObject:[NSString stringWithFormat:@"0x%X:\"%@\"", rva, symbolName]
forKey:[NSNumber numberWithUnsignedLong:rva]];
}
else
{
uint64_t rva64 = [self fileOffsetToRVA64:range.location];
[symbolNames setObject:[NSString stringWithFormat:@"0x%qX:\"%@\"", rva64, symbolName]
forKey:[NSNumber numberWithUnsignedLongLong:rva64]];
}
}
return node;
}
//-----------------------------------------------------------------------------
-(MVNode *)createLiteralsNode:(MVNode *)parent
caption:(NSString *)caption
location:(uint32_t)location
length:(uint32_t)length
stride:(uint32_t)stride
{
MVNodeSaver nodeSaver;
MVNode * node = [parent insertChildWithDetails:caption location:location length:length saver:nodeSaver];
NSRange range = NSMakeRange(location,0);
NSString * lastReadHex;
while (NSMaxRange(range) < location + length)
{
NSData * data = [dataController read_bytes:range length:stride lastReadHex:&lastReadHex];
NSString * literalStr;
switch (stride)
{
case sizeof(float):
{
double num = *(float *)[data bytes];
literalStr = [NSString stringWithFormat:@"%.16g", num];
} break;
case sizeof(double):
{
double num = *(double *)[data bytes];
literalStr = [NSString stringWithFormat:@"%.16g", num];
} break;
default:
case sizeof(long double):
{
long double num = *(long double *)[data bytes];
literalStr = [NSString stringWithFormat:@"%.16Lg", num];
} break;
}
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"Floating Point Number"
:literalStr];
// fill in lookup table with string literals
if ([self is64bit] == NO)
{
uint32_t rva = [self fileOffsetToRVA:range.location];
[symbolNames setObject:[NSString stringWithFormat:@"0x%X:%@f", rva, literalStr]
forKey:[NSNumber numberWithUnsignedLong:rva]];
}
else
{
uint64_t rva64 = [self fileOffsetToRVA64:range.location];
[symbolNames setObject:[NSString stringWithFormat:@"0x%qX:%@f", rva64, literalStr]
forKey:[NSNumber numberWithUnsignedLongLong:rva64]];
}
}
return node;
}
//-----------------------------------------------------------------------------
- (MVNode *)createIndPointersNode:(MVNode *)parent
caption:(NSString *)caption
location:(uint32_t)location
length:(uint32_t)length
{
MVNodeSaver nodeSaver;
MVNode * node = [parent insertChildWithDetails:caption location:location length:length saver:nodeSaver];
NSRange range = NSMakeRange(location,0);
NSString * lastReadHex;
while (NSMaxRange(range) < location + length)
{
[dataController read_uint32:range lastReadHex:&lastReadHex];
NSString * symbolName = [self findSymbolAtRVA:[self fileOffsetToRVA:range.location]];
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"Indirect Pointer"
:symbolName];
[node.details setAttributes:MVMetaDataAttributeName,symbolName,nil];
}
return node;
}
//-----------------------------------------------------------------------------
- (MVNode *)createIndPointers64Node:(MVNode *)parent
caption:(NSString *)caption
location:(uint32_t)location
length:(uint32_t)length
{
MVNodeSaver nodeSaver;
MVNode * node = [parent insertChildWithDetails:caption location:location length:length saver:nodeSaver];
NSRange range = NSMakeRange(location,0);
NSString * lastReadHex;
while (NSMaxRange(range) < location + length)
{
[dataController read_uint64:range lastReadHex:&lastReadHex];
NSString * symbolName = [self findSymbolAtRVA64:[self fileOffsetToRVA64:range.location]];
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"Indirect Pointer"
:symbolName];
[node.details setAttributes:MVMetaDataAttributeName,symbolName,nil];
}
return node;
}
//-----------------------------------------------------------------------------
- (MVNode *)createIndStubsNode:(MVNode *)parent
caption:(NSString *)caption
location:(uint32_t)location
length:(uint32_t)length
stride:(uint32_t)stride
{
MVNodeSaver nodeSaver;
MVNode * node = [parent insertChildWithDetails:caption location:location length:length saver:nodeSaver];
NSRange range = NSMakeRange(location,0);
NSString * lastReadHex;
while (NSMaxRange(range) < location + length)
{
[dataController read_bytes:range length:stride lastReadHex:&lastReadHex];
NSString * symbolName = [self findSymbolAtRVA:[self fileOffsetToRVA:range.location]];
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"Indirect Stub"
:symbolName];
[node.details setAttributes:MVMetaDataAttributeName,symbolName,nil];
}
return node;
}
//-----------------------------------------------------------------------------
- (MVNode *)createIndStubs64Node:(MVNode *)parent
caption:(NSString *)caption
location:(uint32_t)location
length:(uint32_t)length
stride:(uint32_t)stride
{
MVNodeSaver nodeSaver;
MVNode * node = [parent insertChildWithDetails:caption location:location length:length saver:nodeSaver];
NSRange range = NSMakeRange(location,0);
NSString * lastReadHex;
while (NSMaxRange(range) < location + length)
{
[dataController read_bytes:range length:stride lastReadHex:&lastReadHex];
NSString * symbolName = [self findSymbolAtRVA64:[self fileOffsetToRVA64:range.location]];
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"Indirect Stub"
:symbolName];
[node.details setAttributes:MVMetaDataAttributeName,symbolName,nil];
}
return node;
}
//============================= X86 =========================
//===========================================================
static AsmFootPrint const classicStubHelperX86 =
{
{1, 0x68}, GAP(4), // pushl $foo$lazy_ptr
{1, 0xE9}, GAP(4), // jmp helperhelper
};
static AsmFootPrint const hybridStubHelperX86 =
{
{1, 0x68}, GAP(4), // pushl $lazy-info-offset
{1, 0x68}, GAP(4), // pushl $foo$lazy_ptr
{1, 0xE9}, GAP(4), // jmp dyld_hybrid_stub_binding_helper
{1, 0x90}, // nop
};
static AsmFootPrint const hybridStubHelperHelperX86 =
{
{2, 0x83, 0x3D}, GAP(4), {1, 0x00}, // cmpl $0x00,_fast_lazy_bind
{2, 0x75, 0x0D}, // jne $0x0D
{4, 0x89, 0x44, 0x24, 0x04}, // movl %eax,4(%esp)
{1, 0x58}, // popl %eax
{3, 0x87, 0x04, 0x24}, // xchgl (%esp),%eax
{1, 0xE9}, GAP(4), // jmpl dyld_stub_binding_helper
{3, 0x83, 0xC4, 0x04}, // addl $0x04,%esp
{1, 0x68}, GAP(4), // pushl imageloadercache
{2, 0xFF, 0x25}, GAP(4), // jmp *_fast_lazy_bind(%rip)
};
static AsmFootPrint const fastStubHelperX86 =
{
{1, 0x68}, GAP(4), // pushl $lazy-info-offset
{1, 0xE9}, GAP(4), // jmp helperhelper
};
static AsmFootPrint const fastStubHelperHelperX86 =
{
{1, 0x68}, GAP(4), // pushl imageloadercache
{2, 0xFF, 0x25}, GAP(4), // jmp *_fast_lazy_bind
{1, 0x90}, // nop
};
//=========================== X86_64 ========================
//===========================================================
static AsmFootPrint const classicStubHelperX86_64 =
{
{3, 0x4C, 0x8D, 0x1D}, GAP(4), // lea foo$lazy_ptr(%rip),%r11
{1, 0xE9}, GAP(4), // jmp dyld_stub_binding_helper
};
static AsmFootPrint const hybridStubHelperX86_64 =
{
{1, 0x68}, GAP(4), // pushq $lazy-info-offset
{3, 0x4C, 0x8D, 0x1D}, GAP(4), // lea foo$lazy_ptr(%rip),%r11
{1, 0xE9}, GAP(4), // jmp helper-helper
{1, 0x90}, // nop
};
static AsmFootPrint const hybridStubHelperHelperX86_64 =
{
{3, 0x48, 0x83, 0x3D}, GAP(4), {1, 0x00}, // cmpq $0x00,_fast_lazy_bind
{2, 0x74, 0x0F}, // je $0x0F
{3, 0x4C, 0x8D, 0x1D}, GAP(4), // leaq imageCache(%rip),%r11
{2, 0x41, 0x53}, // pushq %r11
{2, 0xFF, 0x25}, GAP(4), // jmp *_fast_lazy_bind(%rip)
{4, 0x48, 0x83, 0xC4, 0x08}, // addq $8,%rsp
{1, 0xE9}, GAP(4), // jmp dyld_stub_binding_helper
};
static AsmFootPrint const fastStubHelperX86_64 =
{
{1, 0x68}, GAP(4), // pushq $lazy-info-offset
{1, 0xE9}, GAP(4), // jmp helperhelper
};
static AsmFootPrint const fastStubHelperHelperX86_64 =
{
{3, 0x4C, 0x8D, 0x1D}, GAP(4), // leaq dyld_mageLoaderCache(%rip),%r11
{2, 0x41, 0x53}, // pushq %r11
{2, 0xFF, 0x25}, GAP(4), // jmp *_fast_lazy_bind(%rip)
{1, 0x90}, // nop
};
//=========================== ARM ===========================
//===========================================================
static AsmFootPrint const fastStubHelperARM =
{
{4, 0xe5, 0x9f, 0xc0, 0x00}, // ldr ip, [pc, #0]
{4, 0xea, 0x00, 0x00, 0x00}, // b _helperhelper
GAP(4), // lazy binding info
};
static AsmFootPrint const fastStubHelperHelperARM =
{
// push lazy-info-offset
{4, 0xe5, 0x2d, 0xc0, 0x04}, // str ip, [sp, #-4]!
// push address of dyld_mageLoaderCache
{4, 0xe5, 0x9f, 0xc0, 0x10}, // ldr ip, L1
{4, 0xe0, 0x8f, 0xc0, 0x0c}, // add ip, pc, ip
{4, 0xe5, 0x2d, 0xc0, 0x04}, // str ip, [sp, #-4]!
// jump through _fast_lazy_bind
{4, 0xe5, 0x9f, 0xc0, 0x08}, // ldr ip, L2
{4, 0xe0, 0x8f, 0xc0, 0x0c}, // add ip, pc, ip
{4, 0xe5, 0x9c, 0xf0, 0x00}, // ldr pc, [ip]
GAP(4), // L1: .long fFastStubGOTAtom - (helperhelper+16)
GAP(4), // L2: .long _fast_lazy_bind - (helperhelper+28)
};
//-----------------------------------------------------------------------------
// __stub_helper:
//
// StubHelperHelper
// StubHelper
// StubHelper
// ...
// __symbol_stub1:
// FF 25 <relative to indirect>
// ...
//-----------------------------------------------------------------------------
- (MVNode *)createStubHelperNode:(MVNode *)parent
caption:(NSString *)caption
location:(uint32_t)location
length:(uint32_t)length
{
MVNodeSaver nodeSaver;
MVNode * node = [parent insertChildWithDetails:caption location:location length:length saver:nodeSaver];
NSRange range = NSMakeRange(location,0);
NSString * lastReadHex;
NSData * data;
uint32_t address;
if ([self matchAsmAtOffset:range.location
asmFootPrint:hybridStubHelperHelperX86
lineCount:sizeof(hybridStubHelperHelperX86)/FOOTPRINT_STRIDE])
{
data = [dataController read_bytes:range length:7 lastReadHex:&lastReadHex];
address = *(uint32_t *)((uint8_t *)data.bytes + 2);
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"cmpl $0x00,_fast_lazy_bind"
:[self findSymbolAtRVA:address]];
[dataController read_bytes:range length:2 lastReadHex:&lastReadHex];
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"jne $0x0D"
:@""];
[dataController read_bytes:range length:4 lastReadHex:&lastReadHex];
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"movl %eax,4(%esp)"
:@""];
[dataController read_bytes:range length:1 lastReadHex:&lastReadHex];
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"popl %eax"
:@""];
[dataController read_bytes:range length:3 lastReadHex:&lastReadHex];
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"xchgl (%esp),%eax"
:@""];
data = [dataController read_bytes:range length:5 lastReadHex:&lastReadHex];
address = [self fileOffsetToRVA:NSMaxRange(range) + *(uint32_t *)((uint8_t *)data.bytes + 1)];
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"jmpl dyld_stub_binding_helper"
:[self findSymbolAtRVA:address]];
[dataController read_bytes:range length:3 lastReadHex:&lastReadHex];
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"addl $0x04,%esp"
:@""];
data = [dataController read_bytes:range length:5 lastReadHex:&lastReadHex];
address = *(uint32_t *)((uint8_t *)data.bytes + 1);
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"pushl imageloadercache"
:[self findSymbolAtRVA:address]];
data = [dataController read_bytes:range length:6 lastReadHex:&lastReadHex];
address = *(uint32_t *)((uint8_t *)data.bytes + 2);
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"jmp *_fast_lazy_bind(%rip)"
:[self findSymbolAtRVA:address]];
[node.details setAttributes:MVUnderlineAttributeName,@"YES",nil];
}
else if ([self matchAsmAtOffset:range.location
asmFootPrint:fastStubHelperHelperX86
lineCount:sizeof(fastStubHelperHelperX86)/FOOTPRINT_STRIDE])
{
data = [dataController read_bytes:range length:5 lastReadHex:&lastReadHex];
address = *(uint32_t *)((uint8_t *)data.bytes + 1);
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"pushl imageloadercache"
:[self findSymbolAtRVA:address]];
data = [dataController read_bytes:range length:6 lastReadHex:&lastReadHex];
address = *(uint32_t *)((uint8_t *)data.bytes + 2);
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"jmp *_fast_lazy_bind"
:[self findSymbolAtRVA:address]];
[dataController read_bytes:range length:1 lastReadHex:&lastReadHex];
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"nop"
:@""];
[node.details setAttributes:MVUnderlineAttributeName,@"YES",nil];
}
return node;
}
//-----------------------------------------------------------------------------
- (MVNode *)createTextNode:(MVNode *)parent
caption:(NSString *)caption
location:(uint32_t)location
length:(uint32_t)length
reloff:(uint32_t)reloff
nreloc:(uint32_t)nreloc
extreloff:(uint32_t)extreloff
nextrel:(uint32_t)nextrel
locreloff:(uint32_t)locreloff
nlocrel:(uint32_t)nlocrel
{
MVNodeSaver nodeSaver;
MVNode * node = [parent insertChildWithDetails:caption location:location length:length saver:nodeSaver];
// accumulate search info
NSUInteger bookmark = node.details.rowCount;
NSString * symbolName = nil;
if (length == 0) // prevent from attempting to parse zero length sections
{
return node;
}
// prepare disassembler params
//===========================================================================
MATCH_STRUCT(mach_header,imageOffset);
char * ot_sect = (char *)[dataController.fileData bytes] + location;
uint32_t ot_left = length;
uint64_t ot_addr = ([self is64bit] == NO ? [self fileOffsetToRVA:location] : [self fileOffsetToRVA64:location]);
uint64_t ot_sect_addr = ot_addr;
uint64_t ot_seg_addr = ot_addr;
enum byte_sex ot_object_byte_sex = LITTLE_ENDIAN_BYTE_SEX; // the only one we support so far
struct nlist * ot_symbols = (symbols.empty() ? NULL : const_cast<struct nlist *>(symbols[0]));
struct nlist_64 * ot_symbols64 = (symbols_64.empty() ? NULL : const_cast<struct nlist_64 *>(symbols_64[0]));
uint32_t ot_nsymbols = ([self is64bit] == NO ? symbols.size() : symbols_64.size());
char * ot_strings = (char *)strtab;
uint32_t ot_strings_size = (char *)[dataController.fileData bytes] - strtab;
uint32_t * ot_indirect_symbols = (isymbols.empty() ? NULL : const_cast<uint32_t *>(isymbols[0]));
uint32_t ot_nindirect_symbols = isymbols.size();
struct load_command * ot_load_commands = (struct load_command *)(commands[0]);
uint32_t ot_ncmds = commands.size();
uint32_t ot_sizeofcmds = mach_header->sizeofcmds;
cpu_type_t ot_cputype = mach_header->cputype;
cpu_subtype_t ot_cpu_subtype = mach_header->cpusubtype;
BOOL ot_verbose = TRUE;
BOOL ot_llvm_mc = FALSE; /* disassemble as llvm-mc will assemble */
struct data_in_code_entry * ot_dices = (dices.empty() ? NULL : const_cast<struct data_in_code_entry *>(dices[0]));
uint32_t ot_ndices = dices.size();
char * ot_object_addr = (char *)mach_header;
uint32_t ot_object_size = imageSize;
#pragma message "TODO"
struct dyld_bind_info * ot_dbi = NULL;
uint64_t ot_ndbi = 0;
LLVMDisasmContextRef ot_arm_dc = NULL;
LLVMDisasmContextRef ot_thumb_dc = NULL;
LLVMDisasmContextRef ot_i386_dc = NULL;
LLVMDisasmContextRef ot_x86_64_dc = NULL;
LLVMDisasmContextRef ot_arm64_dc = NULL;
//===========================================================================
if((qflag || gflag) && mach_header->cputype == CPU_TYPE_ARM)
{
@synchronized([self class])
{
ot_arm_dc = create_arm_llvm_disassembler(mach_header->cpusubtype);
NSAssert(ot_arm_dc, @"can't create arm llvm disassembler");
}
@synchronized([self class])
{
ot_thumb_dc = create_thumb_llvm_disassembler(mach_header->cpusubtype);
NSAssert(ot_thumb_dc, @"can't create thumb llvm disassembler");
}
llvm_disasm_set_options(ot_arm_dc, LLVMDisassembler_Option_PrintImmHex);
llvm_disasm_set_options(ot_thumb_dc, LLVMDisassembler_Option_PrintImmHex);
}
if((qflag || gflag) && mach_header->cputype == CPU_TYPE_ARM64)
{
@synchronized([self class])
{
ot_arm64_dc = create_arm64_llvm_disassembler();
NSAssert(ot_arm64_dc, @"can't create arm64 llvm disassembler");
}
llvm_disasm_set_options(ot_arm64_dc, LLVMDisassembler_Option_PrintImmHex);
}
if((qflag || gflag) && mach_header->cputype == CPU_TYPE_I386)
{
@synchronized([self class])
{
ot_i386_dc = create_i386_llvm_disassembler();
NSAssert(ot_i386_dc, @"can't create i386 llvm disassembler");
}
llvm_disasm_set_options(ot_i386_dc, LLVMDisassembler_Option_PrintImmHex);
}
if((qflag || gflag) && mach_header->cputype == CPU_TYPE_X86_64)
{
@synchronized([self class])
{
ot_x86_64_dc = create_x86_64_llvm_disassembler();
NSAssert(ot_x86_64_dc, @"can't create x86_64 llvm disassembler");
}
llvm_disasm_set_options(ot_x86_64_dc, LLVMDisassembler_Option_PrintImmHex);
}
if(mach_header->cputype == CPU_TYPE_ARM &&
(mach_header->cpusubtype == CPU_SUBTYPE_ARM_V7 ||
mach_header->cpusubtype == CPU_SUBTYPE_ARM_V7F ||
mach_header->cpusubtype == CPU_SUBTYPE_ARM_V7S ||
mach_header->cpusubtype == CPU_SUBTYPE_ARM_V7K ||
mach_header->cpusubtype == CPU_SUBTYPE_ARM_V8))
{
//if(sect_flags & S_SYMBOL_STUBS)
// in_thumb = FALSE;
//else
in_thumb = TRUE;
}
else
in_thumb = FALSE;
//===========================================================================
// collect thumb symbols
set<uint64_t> thumbSymbols;
if (mach_header->cputype == CPU_TYPE_ARM ||
mach_header->cputype == CPU_TYPE_ARM64)
{
for(uint32_t i = 0; i < ot_nsymbols; ++i)
{
uint8_t n_type;
uint16_t n_desc;
uint64_t n_value;
if([self is64bit] == NO)
{
struct nlist const * nlist = symbols.at(i);
n_type = nlist->n_type;
n_desc = nlist->n_desc;
n_value = nlist->n_value;
}
else
{
struct nlist_64 const * nlist_64 = symbols_64.at(i);
n_type = nlist_64->n_type;
n_desc = nlist_64->n_desc;
n_value = nlist_64->n_value;
}
if((n_type & N_TYPE) == N_SECT && (n_desc & N_ARM_THUMB_DEF))
{
thumbSymbols.insert(n_value);
}
}
}
//===========================================================================
/* create aligned, sorted symbol entries */
vector<struct symbol> sorted_symbols;
NSEnumerator * enumerator = [symbolNames keyEnumerator];
id key;
while ((key = [enumerator nextObject]) != nil)
{
NSNumber * symbolIndex = (NSNumber *)key;
// skip external symbols
if (([self is64bit] == NO && (int32_t)[symbolIndex unsignedLongValue] < 0) ||
(int64_t)[symbolIndex unsignedLongLongValue] < 0)
{
continue;
}
struct symbol symbol;
symbol.name = strdup(CSTRING([symbolNames objectForKey:key]));
symbol.n_value = [symbolIndex unsignedLongLongValue];
symbol.is_thumb = (thumbSymbols.find(symbol.n_value) != thumbSymbols.end());
sorted_symbols.push_back(symbol);
}
qsort(&sorted_symbols[0], sorted_symbols.size(), sizeof(struct symbol),
(int (*)(const void *, const void *))sym_compare);
struct symbol * ot_sorted_symbols = &sorted_symbols[0];
uint32_t ot_nsorted_symbols = sorted_symbols.size();
//===========================================================================
/* collect relocations entries */
struct relocation_info * ot_relocs = (struct relocation_info *)((char *)[dataController.fileData bytes] + reloff);
uint32_t ot_nrelocs = nreloc;
struct relocation_info * ot_ext_relocs = (struct relocation_info *)((char *)[dataController.fileData bytes] + extreloff);
uint32_t ot_next_relocs = nextrel;
struct relocation_info * ot_loc_relocs = (struct relocation_info *)((char *)[dataController.fileData bytes] + locreloff);
uint32_t ot_nloc_relocs = nlocrel;
//===========================================================================
/*
start = (uint8_t *)(object_addr + dyld_info.bind_off);
end = start + dyld_info.bind_size;
get_dyld_bind_info(start, end, dylibs, ndylibs, segs, nsegs,
segs64, nsegs64, dbi, ndbi);
*/
//===========================================================================
do
{
// catch thread cancellation request
if ([backgroundThread isCancelled])
{
break;
}
// pipes makes us to run disassembling exclusively on a single thread
[pipeCondition lock];
while (numIOThread > 0)
{
[pipeCondition wait];
}
int pfdout[3]; // 0:read 1:write 2:stdout
if (pipe (pfdout) != 0)
{
[NSException raise:@"pipe" format:@"unable to create pipes"];
}
// save standard output descriptor
pfdout[2] = dup(STDOUT_FILENO);
// redirect
close(STDOUT_FILENO);
dup2 (pfdout[1], STDOUT_FILENO);
// run disassembler line by line
setlinebuf(stdout);
NSUInteger nAsmLine = 0;
do
{
uint32_t parsed_bytes;
try
{
parsed_bytes =
(mach_header->cputype == CPU_TYPE_I386 ||
mach_header->cputype == CPU_TYPE_X86_64
? i386_disassemble(
ot_sect,
ot_left,
ot_addr,
ot_sect_addr,
ot_object_byte_sex,
ot_relocs,
ot_nrelocs,
ot_ext_relocs,
ot_next_relocs,
ot_loc_relocs,
ot_nloc_relocs,
ot_dbi,
ot_ndbi,
ot_symbols,
ot_symbols64,
ot_nsymbols,
ot_sorted_symbols,
ot_nsorted_symbols,
ot_strings,
ot_strings_size,
ot_indirect_symbols,
ot_nindirect_symbols,
ot_cputype,
ot_load_commands,
ot_ncmds,
ot_sizeofcmds,
ot_verbose,
ot_llvm_mc,
ot_i386_dc,
ot_x86_64_dc,
ot_object_addr,
ot_object_size,
NULL,
NULL,
0
)
: mach_header->cputype == CPU_TYPE_ARM
? arm_disassemble(
ot_sect,
ot_left,
ot_addr,
ot_sect_addr,
ot_object_byte_sex,
ot_relocs,
ot_nrelocs,
ot_symbols,
ot_nsymbols,
ot_sorted_symbols,
ot_nsorted_symbols,
ot_strings,
ot_strings_size,
ot_indirect_symbols,
ot_nindirect_symbols,
ot_load_commands,
ot_ncmds,
ot_sizeofcmds,
ot_cpu_subtype,
ot_verbose,
ot_arm_dc,
ot_thumb_dc,
ot_object_addr,
ot_object_size,
ot_dices,
ot_ndices,
ot_seg_addr,
NULL,
NULL,
0
)
: mach_header->cputype == CPU_TYPE_ARM64
? arm64_disassemble(
ot_sect,
ot_left,
ot_addr,
ot_sect_addr,
ot_object_byte_sex,
ot_relocs,
ot_nrelocs,
ot_ext_relocs,
ot_next_relocs,
ot_loc_relocs,
ot_nloc_relocs,
ot_dbi,
ot_ndbi,
ot_symbols64,
ot_nsymbols,
ot_sorted_symbols,
ot_nsorted_symbols,
ot_strings,
ot_strings_size,
ot_indirect_symbols,
ot_nindirect_symbols,
ot_load_commands,
ot_ncmds,
ot_sizeofcmds,
ot_object_addr,
ot_object_size,
ot_verbose,
ot_arm64_dc
)
: 0);
}
catch(...)
{
// sometimes the disassembler crashes on encrypted text section
break;
}
if (parsed_bytes == 0)
break;
// read from pipe
char buf[0x1000], *pbuf = buf;
ssize_t lenbuf = read(pfdout[0], buf, sizeof(buf)-1);
buf[lenbuf] = '\0'; // terminate buffer
size_t field_start_pos = 0; // start position in buffer of the current field
while (pbuf - buf < lenbuf)
{
if (*pbuf == '\n') // newline or
{
*pbuf = '\0'; // clear newline
char const * symbol_name = guess_symbol(ot_addr,
ot_sorted_symbols,
ot_nsorted_symbols);
// print label if any
if (symbol_name)
{
// close previous block (if any)
if (symbolName)
{
[node.details setAttributesFromRowIndex:bookmark:MVMetaDataAttributeName,symbolName,nil];
[node.details setAttributes:MVUnderlineAttributeName,@"YES",nil];
}
// start new block
bookmark = node.details.rowCount;
[node.details appendRow:@""
:@""
:[NSString stringWithFormat:@"%@:", (symbolName = NSSTRING(symbol_name))]
:@""];
[node.details setAttributes:MVCellColorAttributeName,[NSColor orangeColor],nil];
}
// print one line of asm
uint32_t fileOffset = ([self is64bit] == NO ? [self RVAToFileOffset:(uint32_t)ot_addr] : [self RVA64ToFileOffset:ot_addr]);
NSRange range = NSMakeRange(fileOffset,0);
NSString * lastReadHex;
[dataController read_bytes:range length:parsed_bytes lastReadHex:&lastReadHex];
[node.details appendRow:[NSString stringWithFormat:@"%.8X", fileOffset]
:lastReadHex
:NSSTRING(buf)
:@""];
break; // stop processing after the first new line
}
else if (*pbuf == '\t')
{
// replace tabs with spaces in order to keep indention
size_t wsn = TAB_WIDTH - ((pbuf - buf - field_start_pos) % TAB_WIDTH);
*pbuf = ' '; // change the tab char to space
// shift everything after the tab char right
for (char * p = buf + lenbuf; p > pbuf; --p)
{
*(p + wsn - 1) = *p;
*p = ' ';
}
// adjust pointers
pbuf += wsn;
lenbuf += wsn;
// store start position of the field for the next tab
field_start_pos = pbuf - buf;
}
else
{
++pbuf;
}
}
// synchronize disassembler
ot_left -= parsed_bytes;
ot_sect += parsed_bytes;
ot_addr += parsed_bytes;
// inner loop forces to switch task after every 4096 lines of assembly
} while (ot_addr < ot_sect_addr + length && (++nAsmLine % 0x1000));
// close read handle
close (pfdout[0]);
// close write handle
close (pfdout[1]);
// restore standard outputs
dup2 (pfdout[2], STDOUT_FILENO);
close (pfdout[2]);
[pipeCondition unlock];