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LinkEdit.mm
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LinkEdit.mm
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/*
* LinkEdit.mm
* MachOView
*
* Created by psaghelyi on 20/07/2010.
*
*/
#include <string>
#include <vector>
#include <set>
#include <map>
#import "Common.h"
#import "LinkEdit.h"
#import "ReadWrite.h"
#import "DataController.h"
#import <mach-o/loader.h>
#import <mach-o/reloc.h>
#import <mach-o/arm/reloc.h>
#import <mach-o/arm64/reloc.h>
#import <mach-o/x86_64/reloc.h>
#import <mach-o/nlist.h>
using namespace std;
//============================================================================
@implementation MachOLayout (LinkEdit)
//-----------------------------------------------------------------------------
- (MVNode *) createRelocNode:(MVNode *)parent
caption:(NSString *)caption
location:(uint64_t)location
length:(uint64_t)length
baseAddress:(uint32_t)baseAddress // start of the section containing the relocation (image: start of the first segment)
{
MVNodeSaver nodeSaver;
MVNode * node = [parent insertChildWithDetails:caption location:location length:length saver:nodeSaver];
NSRange range = NSMakeRange(location,0);
NSString * lastReadHex;
MATCH_STRUCT(mach_header,imageOffset);
struct scattered_relocation_info const * prev_scattered_relocation_info = NULL; // for sectdiff & pair
for (uint32_t nreloc = 0; nreloc < length / sizeof(struct relocation_info); ++nreloc)
{
if ([backgroundThread isCancelled]) break;
// normal: relocation_info != NULL, scattered_relocation_info == NULL
// scattered: relocation_info == NULL, scattered_relocation_info != NULL
MATCH_STRUCT(relocation_info,location + nreloc * sizeof(struct relocation_info))
struct scattered_relocation_info const * scattered_relocation_info = NULL;
if (relocation_info->r_address & R_SCATTERED)
{
scattered_relocation_info = (struct scattered_relocation_info const *)relocation_info;
relocation_info = NULL;
}
// accumulate search info
NSUInteger bookmark = node.details.rowCount;
NSString * symbolName = nil;
NSColor * color = nil;
// read the first half of the entry
[dataController read_uint32:range lastReadHex:&lastReadHex];
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"Address"
:[NSString stringWithFormat:@"0x%X", relocation_info
? relocation_info->r_address + baseAddress
: scattered_relocation_info->r_address + baseAddress]];
[node.details appendRow:@"":@"":@"Scattered":scattered_relocation_info ? @"True" : @"False"];
// read the second half of the entry
[dataController read_uint32:range lastReadHex:&lastReadHex];
if (relocation_info)
{
uint64_t relocLocation = [self RVAToFileOffset:baseAddress + relocation_info->r_address];
NSRange rangeReloc = NSMakeRange(relocLocation,0);
uint32_t relocValue = [dataController read_uint32:rangeReloc];
uint32_t relocLength = (1 << relocation_info->r_length);
NSParameterAssert(relocLength == sizeof(uint32_t));
// adjust for PC relative relocs
if (relocation_info->r_pcrel)
{
relocValue += relocation_info->r_address + baseAddress + relocLength;
}
if (relocation_info->r_extern)
{
// target is a symbol
if (relocation_info->r_symbolnum >= symbols.size())
{
[NSException raise:@"Symbol"
format:@"index is out of range %u", relocation_info->r_symbolnum];
}
struct nlist const * nlist = [self getSymbolByIndex:relocation_info->r_symbolnum];
symbolName = NSSTRING(strtab + nlist->n_un.n_strx);
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"Symbol"
:(nlist->n_type & N_TYPE) == N_SECT
? [NSString stringWithFormat:@"0x%X (%@)", nlist->n_value, symbolName]
: symbolName];
[symbolNames setObject:[NSString stringWithFormat:@"%@->%@",
[self findSymbolAtRVA:[self fileOffsetToRVA:relocLocation]],symbolName]
forKey:[NSNumber numberWithUnsignedLong:[self fileOffsetToRVA:relocLocation]]];
if ((nlist->n_type & N_TYPE) == N_SECT)
{
// reference to local symbol
relocValue += nlist->n_value;
}
else
{
// reference to undefined external symbol
uint32_t relocAddend = relocValue;
// use the negative index of the symbol (hope that will not overlap)
relocValue += *symbols.begin() - nlist - 1;
if (relocAddend != 0)
{
[node.details appendRow:@"":@"":@"Addend":(int32_t)relocAddend < 0
? [NSString stringWithFormat:@"-0x%X",-relocAddend]
: [NSString stringWithFormat:@"0x%X",relocAddend]];
}
}
}
else // r_symbolnum means section index
{
if (relocation_info->r_symbolnum == R_ABS)
{
// absolute address
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"Section"
:@"R_ABS"];
}
else
{
// section relative (symbolNum means sectionNum)
if (relocation_info->r_symbolnum >= sections.size())
{
[NSException raise:@"Section"
format:@"index is out of range %u", relocation_info->r_symbolnum];
}
struct section const * section = [self getSectionByIndex:relocation_info->r_symbolnum];
NSString * sectionName = [NSString stringWithFormat:@"(%s,%s)",
string(section->segname,16).c_str(),
string(section->sectname,16).c_str()];
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"Section"
:[NSString stringWithFormat:@"%u %@", relocation_info->r_symbolnum, sectionName]];
[node.details appendRow:@"":@"":@"Target":(symbolName = [self findSymbolAtRVA:relocValue])];
[symbolNames setObject:[NSString stringWithFormat:@"%@->%@",
[self findSymbolAtRVA:[self fileOffsetToRVA:relocLocation]],symbolName]
forKey:[NSNumber numberWithUnsignedLong:[self fileOffsetToRVA:relocLocation]]];
}
}
// update real data
[self addRelocAtFileOffset:relocLocation withLength:relocLength andValue:relocValue];
//NSLog(@"%@ %.8X --> %@",[self findSectionContainsRVA:[self fileOffsetToRVA:relocLocation]],[self fileOffsetToRVA:relocLocation],[self findSymbolAtRVA:relocValue]);
}
else
//=============================== scattered relocation ===============================
if (scattered_relocation_info)
{
NSParameterAssert(scattered_relocation_info->r_pcrel == false); // have not faced with this yet
uint32_t r_type = scattered_relocation_info->r_type;
if (
(mach_header->cputype == CPU_TYPE_I386 && (r_type == GENERIC_RELOC_SECTDIFF || r_type == GENERIC_RELOC_LOCAL_SECTDIFF))
||
(mach_header->cputype == CPU_TYPE_ARM && (r_type == ARM_RELOC_SECTDIFF || r_type == ARM_RELOC_LOCAL_SECTDIFF))
)
{
prev_scattered_relocation_info = scattered_relocation_info;
}
else if (
((mach_header->cputype == CPU_TYPE_I386 && r_type == GENERIC_RELOC_PAIR)
||
(mach_header->cputype == CPU_TYPE_ARM && r_type == ARM_RELOC_PAIR))
&& prev_scattered_relocation_info
)
{
//read original content at relocation
uint64_t relocLocation = [self RVAToFileOffset:baseAddress + prev_scattered_relocation_info->r_address];
uint32_t relocLength = (1 << prev_scattered_relocation_info->r_length);
NSAssert1(relocLength == sizeof(uint32_t), @"unsupported reloc length (%u)", relocLength);
NSRange rangeReloc = NSMakeRange(relocLocation,0);
uint32_t relocValue = [dataController read_uint32:rangeReloc];
uint32_t relocAddend = relocValue - (prev_scattered_relocation_info->r_value - scattered_relocation_info->r_value);
// the relocation value only differs if it has an addend
if (relocAddend != 0)
{
[node.details appendRow:@"":@"":@"Addend"
:(int32_t)relocAddend < 0
? [NSString stringWithFormat:@"-0x%X", -relocAddend]
: [NSString stringWithFormat:@"0x%X", relocAddend]];
// update real data
relocValue += relocAddend;
[self addRelocAtFileOffset:relocLocation withLength:relocLength andValue:relocValue];
//NSLog(@"%@ %.8X --> %@",[self findSectionContainsRVA:[self fileOffsetToRVA:relocLocation]],[self fileOffsetToRVA:relocLocation],[self findSymbolAtRVA:relocValue]);
}
prev_scattered_relocation_info = NULL; // reset
}
}
//=============================== normal relocations ===============================
if (mach_header->cputype == CPU_TYPE_I386)
{
uint32_t r_type = (relocation_info ? relocation_info->r_type : scattered_relocation_info->r_type);
[node.details appendRow:@"":@"":@"Type"
:r_type == GENERIC_RELOC_VANILLA ? @"GENERIC_RELOC_VANILLA" :
r_type == GENERIC_RELOC_PAIR ? @"GENERIC_RELOC_PAIR" :
r_type == GENERIC_RELOC_SECTDIFF ? @"GENERIC_RELOC_SECTDIFF" :
r_type == GENERIC_RELOC_PB_LA_PTR ? @"GENERIC_RELOC_PB_LA_PTR" :
r_type == GENERIC_RELOC_LOCAL_SECTDIFF ? @"GENERIC_RELOC_LOCAL_SECTDIFF" :
r_type == GENERIC_RELOC_TLV ? @"GENERIC_RELOC_TLV" : @"?????"];
}
else if (mach_header->cputype == CPU_TYPE_ARM)
{
uint32_t r_type = (relocation_info ? relocation_info->r_type : scattered_relocation_info->r_type);
[node.details appendRow:@"":@"":@"Type"
:r_type == ARM_RELOC_VANILLA ? @"ARM_RELOC_VANILLA" :
r_type == ARM_RELOC_PAIR ? @"ARM_RELOC_PAIR" :
r_type == ARM_RELOC_SECTDIFF ? @"ARM_RELOC_SECTDIFF" :
r_type == ARM_RELOC_LOCAL_SECTDIFF ? @"ARM_RELOC_LOCAL_SECTDIFF" :
r_type == ARM_RELOC_PB_LA_PTR ? @"ARM_RELOC_PB_LA_PTR" :
r_type == ARM_RELOC_BR24 ? @"ARM_RELOC_BR24" :
r_type == ARM_THUMB_RELOC_BR22 ? @"ARM_THUMB_RELOC_BR22" :
r_type == ARM_THUMB_32BIT_BRANCH ? @"ARM_THUMB_32BIT_BRANCH" :
r_type == ARM_RELOC_HALF ? @"ARM_RELOC_HALF" :
r_type == ARM_RELOC_HALF_SECTDIFF ? @"ARM_RELOC_HALF_SECTDIFF" : @"?????"];
}
if (relocation_info)
{
[node.details appendRow:@"":@"":@"External"
:relocation_info->r_extern ? @"True" : @"False"];
}
[node.details appendRow:@"":@"":@"PCRelative"
:(relocation_info && relocation_info->r_pcrel) || (scattered_relocation_info && scattered_relocation_info->r_pcrel)
? @"True" : @"False"];
[node.details appendRow:@"":@"":@"Length"
:[NSString stringWithFormat:@"%u",
relocation_info ? (1 << relocation_info->r_length) : (1 << scattered_relocation_info->r_length)]];
if (scattered_relocation_info)
{
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"Value"
:(symbolName = [self findSymbolAtRVA:scattered_relocation_info->r_value])];
color = [NSColor magentaColor];
}
[node.details setAttributesFromRowIndex:bookmark:MVMetaDataAttributeName,symbolName,
MVCellColorAttributeName,color,nil];
[node.details setAttributes:MVUnderlineAttributeName,@"YES",nil];
} // loop
return node;
}
//-----------------------------------------------------------------------------
- (MVNode *) createReloc64Node:(MVNode *)parent
caption:(NSString *)caption
location:(uint64_t)location
length:(uint64_t)length
baseAddress:(uint64_t)baseAddress // start of the section containing the relocation (image: start of the first segment)
{
MVNodeSaver nodeSaver;
MVNode * node = [parent insertChildWithDetails:caption location:location length:length saver:nodeSaver];
NSRange range = NSMakeRange(location,0);
NSString * lastReadHex;
MATCH_STRUCT(mach_header_64,imageOffset);
struct relocation_info const * prev_relocation_info = NULL;
for (uint32_t nreloc = 0; nreloc < length / sizeof(struct relocation_info); ++nreloc)
{
if ([backgroundThread isCancelled]) break;
// In the Mac OS X x86-64 environment scattered relocations are not used. Compiler-generated code
// uses mostly external relocations, in which the r_extern bit is set to 1 and the r_symbolnum field contains
// the symbol-table index of the target label.
MATCH_STRUCT(relocation_info,location + nreloc * sizeof(struct relocation_info))
uint32_t relocLength = (1 << relocation_info->r_length);
NSAssert1(relocLength == sizeof(uint32_t) || relocLength == sizeof(uint64_t), @"unsupported reloc length (%u)", relocLength);
// accumulate search info
NSUInteger bookmark = node.details.rowCount;
NSString * symbolName = nil;
NSColor * color = nil;
// read the first half of the entry
[dataController read_uint32:range lastReadHex:&lastReadHex];
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"Address"
:[NSString stringWithFormat:@"0x%qX", relocation_info->r_address + baseAddress]];
// read the second half of the entry
[dataController read_uint32:range lastReadHex:&lastReadHex];
//========================================================================
if (relocation_info->r_extern)
{
uint64_t relocLocation = [self RVAToFileOffset:baseAddress + relocation_info->r_address];
NSRange rangeReloc = NSMakeRange(relocLocation,0);
// target symbol
if (relocation_info->r_symbolnum >= symbols_64.size())
{
[NSException raise:@"Symbol"
format:@"symbol is out of range %u", relocation_info->r_symbolnum];
}
struct nlist_64 const * nlist_64 = [self getSymbol64ByIndex:relocation_info->r_symbolnum];
symbolName = NSSTRING(strtab + nlist_64->n_un.n_strx);
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"Symbol"
:(nlist_64->n_type & N_TYPE) == N_SECT
? [NSString stringWithFormat:@"0x%qX (%@)", nlist_64->n_value, symbolName]
: symbolName];
[symbolNames setObject:[NSString stringWithFormat:@"%@->%@",
[self findSymbolAtRVA:[self fileOffsetToRVA:relocLocation]],symbolName]
forKey:[NSNumber numberWithUnsignedLongLong:[self fileOffsetToRVA:relocLocation]]];
// For the x86_64 architecure on Mac OS X it is possible to
// encode a signed 32-bit expression of the form:
// "add_symbol - subtract_symbol + number"
// using two relocation entries pointing at the same 32-bits.
// The first one has to be a X86_64_RELOC_SUBTRACTOR then must
// be followed by a X86_64_RELOC_UNSIGNED.
if ((mach_header_64->cputype == CPU_TYPE_X86_64 && relocation_info->r_type == X86_64_RELOC_SUBTRACTOR)
||
(mach_header_64->cputype == CPU_TYPE_ARM64 && relocation_info->r_type == ARM64_RELOC_SUBTRACTOR))
{
color = [NSColor magentaColor];
prev_relocation_info = relocation_info;
}
else if (prev_relocation_info)
{
// reference computed from difference of two symbols
//============================================
NSAssert(!(mach_header_64->cputype == CPU_TYPE_X86_64) || relocation_info->r_type == X86_64_RELOC_UNSIGNED, @"X86_64_RELOC_SUBTRACTOR must be followed by X86_64_RELOC_UNSIGNED");
NSAssert(!(mach_header_64->cputype == CPU_TYPE_ARM64) || relocation_info->r_type == ARM64_RELOC_UNSIGNED, @"ARM64_RELOC_SUBTRACTOR must be followed by ARM64_RELOC_UNSIGNED");
NSParameterAssert (relocation_info->r_address == prev_relocation_info->r_address);
color = [NSColor magentaColor];
if (relocation_info->r_symbolnum >= symbols_64.size())
{
[NSException raise:@"Symbol"
format:@"index is out of range %u", relocation_info->r_symbolnum];
}
struct nlist_64 const * prev_nlist_64 = [self getSymbol64ByIndex:prev_relocation_info->r_symbolnum];
if (relocLength == sizeof(uint32_t))
{
uint32_t relocAddend = [dataController read_uint32:rangeReloc];
if (relocAddend != 0)
{
[node.details appendRow:@"":@"":@"Addend"
:(int32_t)relocAddend < 0
? [NSString stringWithFormat:@"-0x%X",-relocAddend]
: [NSString stringWithFormat:@"0x%X",relocAddend]];
}
uint64_t relocValue = nlist_64->n_value - prev_nlist_64->n_value + relocAddend;
// update real data
[self addRelocAtFileOffset:relocLocation withLength:relocLength andValue:relocValue];
//NSLog(@"diff32: %@ %.16qX --> (%u) %@",[self findSectionContainsRVA64:[self fileOffsetToRVA64:relocLocation]],[self fileOffsetToRVA64:relocLocation],relocLength,[self findSymbolAtRVA64:relocValue]);
}
else if (relocLength == sizeof(uint64_t))
{
uint64_t relocAddend = [dataController read_uint64:rangeReloc];
if (relocAddend != 0)
{
[node.details appendRow:@"":@"":@"Addend"
:(int64_t)relocAddend < 0
? [NSString stringWithFormat:@"-0x%qX",-relocAddend]
: [NSString stringWithFormat:@"0x%qX",relocAddend]];
}
uint64_t relocValue = nlist_64->n_value - prev_nlist_64->n_value + relocAddend;
// update real data
[self addRelocAtFileOffset:relocLocation withLength:relocLength andValue:relocValue];
//NSLog(@"diff64: %@ %.16qX --> (%u) %@",[self findSectionContainsRVA64:[self fileOffsetToRVA64:relocLocation]],[self fileOffsetToRVA64:relocLocation],relocLength,[self findSymbolAtRVA64:relocValue]);
}
prev_relocation_info = NULL; // reset
}
else if ((nlist_64->n_type & N_TYPE) == N_SECT)
{
// reference to local symbol
//============================================
if (relocLength == sizeof(uint32_t))
{
// 32bit signed PC Rel
NSParameterAssert(relocation_info->r_pcrel == true);
// XXX: is this cast correct?
uint32_t relocValue = (uint32_t)(nlist_64->n_value - relocation_info->r_address - baseAddress - relocLength);
uint32_t relocAddend = [dataController read_uint32:rangeReloc];
if (mach_header_64->cputype == CPU_TYPE_X86_64)
{
relocAddend -= (relocation_info->r_type == X86_64_RELOC_SIGNED_1 ? 1 :
relocation_info->r_type == X86_64_RELOC_SIGNED_2 ? 2 :
relocation_info->r_type == X86_64_RELOC_SIGNED_4 ? 4 : 0);
}
if (relocAddend != 0)
{
[node.details appendRow:@"":@"":@"Addend"
:(int32_t)relocAddend < 0
? [NSString stringWithFormat:@"-0x%X",-relocAddend]
: [NSString stringWithFormat:@"0x%X",relocAddend]];
}
// update real data
relocValue += relocAddend;
[self addRelocAtFileOffset:relocLocation withLength:relocLength andValue:relocValue];
//NSLog(@"local32: %@ %.16qX --> (%u) %@",[self findSectionContainsRVA64:[self fileOffsetToRVA64:relocLocation]],[self fileOffsetToRVA64:relocLocation],relocLength,[self findSymbolAtRVA64:relocValue]);
}
else if (relocLength == sizeof(uint64_t))
{
// 64bit unsigned direct
NSParameterAssert(relocation_info->r_pcrel == false);
uint64_t relocValue = nlist_64->n_value;
uint64_t relocAddend = [dataController read_uint64:rangeReloc];
if (relocAddend != 0)
{
[node.details appendRow:@"":@"":@"Addend"
:(int64_t)relocAddend < 0
? [NSString stringWithFormat:@"-0x%qX",-relocAddend]
: [NSString stringWithFormat:@"0x%qX",relocAddend]];
}
// update real data
relocValue += relocAddend;
[self addRelocAtFileOffset:relocLocation withLength:relocLength andValue:relocValue];
//NSLog(@"local64: %@ %.16qX --> (%u) %@",[self findSectionContainsRVA64:[self fileOffsetToRVA64:relocLocation]],[self fileOffsetToRVA64:relocLocation],relocLength,[self findSymbolAtRVA64:relocValue]);
}
}
else
{
// reference to undefined external symbol
//============================================
NSParameterAssert((nlist_64->n_type & N_TYPE) == N_UNDF); // N_PBUD is only in image
if (relocLength == sizeof(uint32_t))
{
NSParameterAssert(relocation_info->r_pcrel == true);
NSRange rangeReloc = NSMakeRange(relocLocation,0);
uint32_t relocAddend = [dataController read_uint32:rangeReloc];
if (mach_header_64->cputype == CPU_TYPE_X86_64)
{
relocAddend -= (relocation_info->r_type == X86_64_RELOC_SIGNED_1 ? 1 :
relocation_info->r_type == X86_64_RELOC_SIGNED_2 ? 2 :
relocation_info->r_type == X86_64_RELOC_SIGNED_4 ? 4 : 0);
}
if (relocAddend != 0)
{
[node.details appendRow:@"":@"":@"Addend"
:(int32_t)relocAddend < 0
? [NSString stringWithFormat:@"-0x%X",-relocAddend]
: [NSString stringWithFormat:@"0x%X",relocAddend]];
}
// XXX: is this cast correct?
uint32_t relocValue = (uint32_t)(*symbols_64.begin() - nlist_64 - 1);
relocValue -= relocation_info->r_address + baseAddress + relocLength; // it is PC relative
// update real data
relocValue += relocAddend;
[self addRelocAtFileOffset:relocLocation withLength:relocLength andValue:relocValue];
//NSLog(@"undef32: %@ %.16qX --> (%u) %@",[self findSectionContainsRVA64:[self fileOffsetToRVA64:relocLocation]],[self fileOffsetToRVA64:relocLocation],relocLength,[self findSymbolAtRVA64:relocValue]);
}
else
{
NSParameterAssert(relocation_info->r_pcrel == false);
NSRange rangeReloc = NSMakeRange(relocLocation,0);
uint64_t relocAddend = [dataController read_uint64:rangeReloc];
if (relocAddend != 0)
{
[node.details appendRow:@"":@"":@"Addend"
:(int64_t)relocAddend < 0
? [NSString stringWithFormat:@"-0x%qX",-relocAddend]
: [NSString stringWithFormat:@"0x%qX",relocAddend]];
}
uint64_t relocValue = *symbols_64.begin() - nlist_64 - 1;
// update real data
relocValue += relocAddend;
[self addRelocAtFileOffset:relocLocation withLength:relocLength andValue:relocValue];
//NSLog(@"undef64: %@ %.16qX --> (%u) %@",[self findSectionContainsRVA64:[self fileOffsetToRVA64:relocLocation]],[self fileOffsetToRVA64:relocLocation],relocLength,[self findSymbolAtRVA64:relocValue]);
}
}
}
else // r_symbolnum means section index
{
// section relative (symbolNum means sectionNum)
if (relocation_info->r_symbolnum >= sections_64.size())
{
[NSException raise:@"Section"
format:@"index is out of range %u", relocation_info->r_symbolnum];
}
struct section_64 const * section_64 = [self getSection64ByIndex:relocation_info->r_symbolnum];
NSString * sectionName = [NSString stringWithFormat:@"(%s,%s)",
string(section_64->segname,16).c_str(),
string(section_64->sectname,16).c_str()];
if (relocation_info->r_symbolnum == R_ABS)
{
// absolute address
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"Section"
:@"R_ABS"];
}
else
{
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"Section"
:[NSString stringWithFormat:@"%u %@", relocation_info->r_symbolnum, sectionName]];
uint64_t relocLocation = [self RVAToFileOffset:baseAddress + relocation_info->r_address];
NSRange rangeReloc = NSMakeRange(relocLocation,0);
uint64_t relocValue = 0;
if ((mach_header_64->cputype == CPU_TYPE_X86_64 && relocation_info->r_type == X86_64_RELOC_SUBTRACTOR)
||
(mach_header_64->cputype == CPU_TYPE_ARM64 && relocation_info->r_type == ARM64_RELOC_SUBTRACTOR))
{
prev_relocation_info = relocation_info;
}
else if (prev_relocation_info)
{
// TODO: calculate if we will ever be interested of the target
// (usually used only in debug_line section)
prev_relocation_info = NULL;
}
else if (relocLength == sizeof(uint32_t))
{
relocValue = [dataController read_uint32:rangeReloc];
if ((mach_header_64->cputype == CPU_TYPE_X86_64 && relocation_info->r_type == X86_64_RELOC_UNSIGNED)
||
(mach_header_64->cputype == CPU_TYPE_ARM64 && relocation_info->r_type == ARM64_RELOC_UNSIGNED))
{
// 32bit direct relocation
NSParameterAssert (relocation_info->r_pcrel == false);
}
else
{
// 32bit PC relative signed relocation
NSParameterAssert (relocation_info->r_pcrel == true);
relocValue += relocation_info->r_address + baseAddress + relocLength;
if (mach_header_64->cputype == CPU_TYPE_X86_64)
{
relocValue -= (relocation_info->r_type == X86_64_RELOC_SIGNED_1 ? 1 :
relocation_info->r_type == X86_64_RELOC_SIGNED_2 ? 2 :
relocation_info->r_type == X86_64_RELOC_SIGNED_4 ? 4 : 0);
}
}
}
else if (relocLength == sizeof(uint64_t))
{
// 64bit direct relocation
NSParameterAssert (!(mach_header_64->cputype == CPU_TYPE_X86_64) || relocation_info->r_type == X86_64_RELOC_UNSIGNED);
NSParameterAssert (!(mach_header_64->cputype == CPU_TYPE_ARM64) || relocation_info->r_type == ARM64_RELOC_UNSIGNED);
NSParameterAssert (relocation_info->r_pcrel == false);
relocValue = [dataController read_uint64:rangeReloc];
}
else
{
NSAssert(NO, @"Unsupported 64bit reloc");
}
[node.details appendRow:@"":@"":@"Target":(symbolName = [self findSymbolAtRVA:relocValue])];
// update real data
[self addRelocAtFileOffset:relocLocation withLength:relocLength andValue:relocValue];
[symbolNames setObject:[NSString stringWithFormat:@"%@->%@",
[self findSymbolAtRVA:[self fileOffsetToRVA:relocLocation]],symbolName]
forKey:[NSNumber numberWithUnsignedLongLong:[self fileOffsetToRVA:relocLocation]]];
//NSLog(@"%@ %.16qX --> (%u) %@",[self findSectionContainsRVA64:[self fileOffsetToRVA64:relocLocation]],[self fileOffsetToRVA64:relocLocation],relocLength,[self findSymbolAtRVA64:relocValue]);
}
}
//========== end of differentation
if (mach_header_64->cputype == CPU_TYPE_X86_64)
{
[node.details appendRow:@"":@"":@"Type"
:relocation_info->r_type == X86_64_RELOC_UNSIGNED ? @"X86_64_RELOC_UNSIGNED" :
relocation_info->r_type == X86_64_RELOC_SIGNED ? @"X86_64_RELOC_SIGNED" :
relocation_info->r_type == X86_64_RELOC_BRANCH ? @"X86_64_RELOC_BRANCH" :
relocation_info->r_type == X86_64_RELOC_GOT_LOAD ? @"X86_64_RELOC_GOT_LOAD" :
relocation_info->r_type == X86_64_RELOC_GOT ? @"X86_64_RELOC_GOT" :
relocation_info->r_type == X86_64_RELOC_SUBTRACTOR ? @"X86_64_RELOC_SUBTRACTOR" :
relocation_info->r_type == X86_64_RELOC_SIGNED_1 ? @"X86_64_RELOC_SIGNED_1" :
relocation_info->r_type == X86_64_RELOC_SIGNED_2 ? @"X86_64_RELOC_SIGNED_2" :
relocation_info->r_type == X86_64_RELOC_SIGNED_4 ? @"X86_64_RELOC_SIGNED_4" : @"?????"];
}
else if (mach_header_64->cputype == CPU_TYPE_ARM64)
{
[node.details appendRow:@"":@"":@"Type"
:relocation_info->r_type == ARM64_RELOC_UNSIGNED ? @"ARM64_RELOC_UNSIGNED" :
relocation_info->r_type == ARM64_RELOC_SUBTRACTOR ? @"ARM64_RELOC_SUBTRACTOR" :
relocation_info->r_type == ARM64_RELOC_BRANCH26 ? @"ARM64_RELOC_BRANCH26" :
relocation_info->r_type == ARM64_RELOC_PAGE21 ? @"ARM64_RELOC_PAGE21" :
relocation_info->r_type == ARM64_RELOC_PAGEOFF12 ? @"ARM64_RELOC_PAGEOFF12" :
relocation_info->r_type == ARM64_RELOC_GOT_LOAD_PAGE21 ? @"ARM64_RELOC_GOT_LOAD_PAGE21" :
relocation_info->r_type == ARM64_RELOC_GOT_LOAD_PAGEOFF12 ? @"ARM64_RELOC_GOT_LOAD_PAGEOFF12" :
relocation_info->r_type == ARM64_RELOC_POINTER_TO_GOT ? @"ARM64_RELOC_POINTER_TO_GOT" :
relocation_info->r_type == ARM64_RELOC_TLVP_LOAD_PAGE21 ? @"ARM64_RELOC_TLVP_LOAD_PAGE21" :
relocation_info->r_type == ARM64_RELOC_TLVP_LOAD_PAGEOFF12 ? @"ARM64_RELOC_TLVP_LOAD_PAGEOFF12" :
relocation_info->r_type == ARM64_RELOC_ADDEND ? @"ARM64_RELOC_ADDEND" : @"?????"];
}
if (relocation_info)
{
[node.details appendRow:@"":@"":@"External"
:relocation_info->r_extern ? @"True" : @"False"];
}
[node.details appendRow:@"":@"":@"PCRelative"
:relocation_info->r_pcrel ? @"True" : @"False"];
[node.details appendRow:@"":@"":@"Length"
:[NSString stringWithFormat:@"%u", relocLength]];
[node.details setAttributesFromRowIndex:bookmark:MVMetaDataAttributeName,symbolName,
MVCellColorAttributeName,color,nil];
[node.details setAttributes:MVUnderlineAttributeName,@"YES",nil];
} // loop relocs
return node;
}
//-----------------------------------------------------------------------------
- (MVNode *) createSymbolsNode:parent
caption:(NSString *)caption
location:(uint64_t)location
length:(uint64_t)length
{
MVNodeSaver nodeSaver;
MVNode * node = [parent insertChildWithDetails:caption location:location length:length saver:nodeSaver];
NSRange range = NSMakeRange(location,0);
NSString * lastReadHex;
for (uint32_t nsym = 0; nsym < length / sizeof(struct nlist); ++nsym)
{
if ([backgroundThread isCancelled]) break;
MATCH_STRUCT(nlist, location + nsym * sizeof(struct nlist))
// accumulate search info
NSUInteger bookmark = node.details.rowCount;
NSString * symbolName = NSSTRING(strtab + nlist->n_un.n_strx);
NSColor * color = nil;
/* print the symbol nr */
[node.details appendRow:[NSString stringWithFormat:@"#%d", nsym]
:@""
:@""
:@""];
[dataController read_uint32:range lastReadHex:&lastReadHex];
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"String Table Index"
:symbolName];
[dataController read_uint8:range lastReadHex:&lastReadHex];
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"Type"
:@""];
if (nlist->n_type & N_STAB)
{
[node.details appendRow:@"":@"":@"E0":@"N_STAB"];
color = [NSColor magentaColor];
}
else
{
switch (nlist->n_type & N_TYPE)
{
case N_UNDF: [node.details appendRow:@"":@"":@"00":@"N_UNDF"]; break;
case N_ABS: [node.details appendRow:@"":@"":@"02":@"N_ABS"]; break;
case N_SECT: [node.details appendRow:@"":@"":@"0E":@"N_SECT"]; break;
case N_PBUD: [node.details appendRow:@"":@"":@"0C":@"N_PBUD"]; break;
case N_INDR: [node.details appendRow:@"":@"":@"0A":@"N_INDR"]; break;
}
if (nlist->n_type & N_PEXT) [node.details appendRow:@"":@"":@"10":@"N_PEXT"];
if (nlist->n_type & N_EXT) [node.details appendRow:@"":@"":@"01":@"N_EXT"];
if (nlist->n_type & N_EXT) color = ((nlist->n_type & N_TYPE) == N_UNDF || (nlist->n_type & N_TYPE) == N_PBUD
? [NSColor greenColor] : [NSColor orangeColor]);
}
struct section const * section = [self getSectionByIndex:nlist->n_sect];
[dataController read_uint8:range lastReadHex:&lastReadHex];
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"Section Index"
:nlist->n_sect == NO_SECT ? @"NO_SECT"
: [NSString stringWithFormat:@"%u (%s,%s)",
nlist->n_sect,
string(section->segname,16).c_str(),
string(section->sectname,16).c_str()]];
[dataController read_uint16:range lastReadHex:&lastReadHex];
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"Description"
:@""];
if ((nlist->n_type & N_STAB) == 0 &&
((nlist->n_type & N_TYPE) == N_UNDF || (nlist->n_type & N_TYPE) == N_PBUD) &&
(nlist->n_type & N_EXT))
{
switch (nlist->n_desc & REFERENCE_TYPE)
{
case REFERENCE_FLAG_UNDEFINED_NON_LAZY: [node.details appendRow:@"":@"":@"0":@"REFERENCE_FLAG_UNDEFINED_NON_LAZY"]; break;
case REFERENCE_FLAG_UNDEFINED_LAZY: [node.details appendRow:@"":@"":@"1":@"REFERENCE_FLAG_UNDEFINED_LAZY"]; break;
case REFERENCE_FLAG_DEFINED: [node.details appendRow:@"":@"":@"2":@"REFERENCE_FLAG_DEFINED"]; break;
case REFERENCE_FLAG_PRIVATE_DEFINED: [node.details appendRow:@"":@"":@"3":@"REFERENCE_FLAG_PRIVATE_DEFINED"]; break;
case REFERENCE_FLAG_PRIVATE_UNDEFINED_NON_LAZY: [node.details appendRow:@"":@"":@"4":@"REFERENCE_FLAG_PRIVATE_UNDEFINED_NON_LAZY"]; break;
case REFERENCE_FLAG_PRIVATE_UNDEFINED_LAZY: [node.details appendRow:@"":@"":@"5":@"REFERENCE_FLAG_PRIVATE_UNDEFINED_LAZY"]; break;
default:
[node.details appendRow:@"":@"":[NSString stringWithFormat:@"%u",nlist->n_desc & REFERENCE_TYPE]:@"???"]; break;
}
uint32_t libOrdinal = GET_LIBRARY_ORDINAL(nlist->n_desc);
struct dylib const * dylib = [self getDylibByIndex:libOrdinal];
[node.details appendRow:@"":@"":@"Library Ordinal"
:[NSString stringWithFormat:@"%u (%@)",libOrdinal,
libOrdinal == SELF_LIBRARY_ORDINAL ? @"SELF_LIBRARY_ORDINAL" :
libOrdinal == DYNAMIC_LOOKUP_ORDINAL ? @"DYNAMIC_LOOKUP_ORDINAL" :
libOrdinal == EXECUTABLE_ORDINAL ? @"EXECUTABLE_ORDINAL" :
[NSSTRING((uint8_t *)dylib + dylib->name.offset - sizeof(struct load_command)) lastPathComponent]]];
}
if ((nlist->n_desc & N_ARM_THUMB_DEF) == N_ARM_THUMB_DEF) [node.details appendRow:@"":@"":@"0008":@"N_ARM_THUMB_DEF"];
if ((nlist->n_desc & REFERENCED_DYNAMICALLY) == REFERENCED_DYNAMICALLY) [node.details appendRow:@"":@"":@"0010":@"REFERENCED_DYNAMICALLY"];
if ((nlist->n_desc & N_NO_DEAD_STRIP) == N_NO_DEAD_STRIP) [node.details appendRow:@"":@"":@"0020":@"N_NO_DEAD_STRIP"];
if ((nlist->n_desc & N_WEAK_REF) == N_WEAK_REF) [node.details appendRow:@"":@"":@"0040":@"N_WEAK_REF"];
if ((nlist->n_type & N_TYPE) == N_UNDF)
{
if ((nlist->n_desc & N_REF_TO_WEAK) == N_REF_TO_WEAK) [node.details appendRow:@"":@"":@"0080":@"N_REF_TO_WEAK"];
}
else
{
if ((nlist->n_desc & N_WEAK_DEF) == N_WEAK_DEF) [node.details appendRow:@"":@"":@"0080":@"N_WEAK_DEF"];
if ((nlist->n_desc & N_SYMBOL_RESOLVER) == N_SYMBOL_RESOLVER) [node.details appendRow:@"":@"":@"0100":@"N_SYMBOL_RESOLVER"];
}
[dataController read_uint32:range lastReadHex:&lastReadHex];
if ((nlist->n_type & N_TYPE) == N_SECT)
{
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"Value"
:(nlist->n_type & N_STAB) || section == NULL
? [NSString stringWithFormat:@"%u", nlist->n_value] : nlist->n_value == 0 ? @"0"
: [NSString stringWithFormat:@"%u ($+%u)", nlist->n_value, nlist->n_value - section->addr]];
// fill in lookup table with defined sybols
if ((nlist->n_type & N_STAB) == 0)
{
// it is possible to associate more than one symbol to the same address.
// every new symbol will be appended to the list
NSString * nameToStore = [symbolNames objectForKey:[NSNumber numberWithUnsignedLong:nlist->n_value]];
nameToStore = (nameToStore != nil
? [nameToStore stringByAppendingFormat:@"(%@)", symbolName]
: [NSString stringWithFormat:@"0x%X (%@)", nlist->n_value, symbolName]);
[symbolNames setObject:nameToStore
forKey:[NSNumber numberWithUnsignedLong:nlist->n_value]];
}
}
else
{
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"Value"
:[NSString stringWithFormat:@"%u", nlist->n_value]];
// fill in lookup table with undefined sybols (key equals (-1) * index)
uint32_t key = (uint32_t)(*symbols.begin() - nlist - 1);
[symbolNames setObject:symbolName
forKey:[NSNumber numberWithUnsignedLong:key]];
}
[node.details setAttributesFromRowIndex:bookmark:MVMetaDataAttributeName,symbolName,
MVCellColorAttributeName,color,nil];
[node.details setAttributes:MVUnderlineAttributeName,@"YES",nil];
} // loop
return node;
}
//-----------------------------------------------------------------------------
- (MVNode *) createSymbols64Node:parent
caption:(NSString *)caption
location:(uint64_t)location
length:(uint64_t)length
{
MVNodeSaver nodeSaver;
MVNode * node = [parent insertChildWithDetails:caption location:location length:length saver:nodeSaver];
NSRange range = NSMakeRange(location,0);
NSString * lastReadHex;
for (uint32_t nsym = 0; nsym < length / sizeof(struct nlist_64); ++nsym)
{
if ([backgroundThread isCancelled]) break;
MATCH_STRUCT(nlist_64, location + nsym * sizeof(struct nlist_64))
// accumulate search info
NSUInteger bookmark = node.details.rowCount;
NSString * symbolName = NSSTRING(strtab + nlist_64->n_un.n_strx);
NSColor * color = nil;
/* print the symbol nr */
[node.details appendRow:[NSString stringWithFormat:@"#%d", nsym]
:@""
:@""
:@""];
[dataController read_uint32:range lastReadHex:&lastReadHex];
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"String Table Index"
:symbolName];
[dataController read_uint8:range lastReadHex:&lastReadHex];
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"Type"
:@""];
if (nlist_64->n_type & N_STAB)
{
[node.details appendRow:@"":@"":@"E0":@"N_STAB"];
color = [NSColor magentaColor];
}
else
{
switch (nlist_64->n_type & N_TYPE)
{
case N_UNDF: [node.details appendRow:@"":@"":@"00":@"N_UNDF"]; break;
case N_ABS: [node.details appendRow:@"":@"":@"02":@"N_ABS"]; break;
case N_SECT: [node.details appendRow:@"":@"":@"0E":@"N_SECT"]; break;
case N_PBUD: [node.details appendRow:@"":@"":@"0C":@"N_PBUD"]; break;
case N_INDR: [node.details appendRow:@"":@"":@"0A":@"N_INDR"]; break;
}
if (nlist_64->n_type & N_PEXT) [node.details appendRow:@"":@"":@"10":@"N_PEXT"];
if (nlist_64->n_type & N_EXT) [node.details appendRow:@"":@"":@"01":@"N_EXT"];
if (nlist_64->n_type & N_EXT) color = ((nlist_64->n_type & N_TYPE) == N_UNDF || (nlist_64->n_type & N_TYPE) == N_PBUD
? [NSColor greenColor] : [NSColor orangeColor]);
}
struct section_64 const * section_64 = [self getSection64ByIndex:nlist_64->n_sect];
[dataController read_uint8:range lastReadHex:&lastReadHex];
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"Section Index"
:nlist_64->n_sect == NO_SECT ? @"NO_SECT"
: [NSString stringWithFormat:@"%u (%s,%s)",
nlist_64->n_sect,
string(section_64->segname,16).c_str(),
string(section_64->sectname,16).c_str()]];
[dataController read_uint16:range lastReadHex:&lastReadHex];
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"Description"
:@""];
if ((nlist_64->n_type & N_STAB) == 0 &&
((nlist_64->n_type & N_TYPE) == N_UNDF || (nlist_64->n_type & N_TYPE) == N_PBUD) &&
(nlist_64->n_type & N_EXT))
{
switch (nlist_64->n_desc & REFERENCE_TYPE)
{
case REFERENCE_FLAG_UNDEFINED_NON_LAZY: [node.details appendRow:@"":@"":@"0":@"REFERENCE_FLAG_UNDEFINED_NON_LAZY"]; break;
case REFERENCE_FLAG_UNDEFINED_LAZY: [node.details appendRow:@"":@"":@"1":@"REFERENCE_FLAG_UNDEFINED_LAZY"]; break;
case REFERENCE_FLAG_DEFINED: [node.details appendRow:@"":@"":@"2":@"REFERENCE_FLAG_DEFINED"]; break;
case REFERENCE_FLAG_PRIVATE_DEFINED: [node.details appendRow:@"":@"":@"3":@"REFERENCE_FLAG_PRIVATE_DEFINED"]; break;
case REFERENCE_FLAG_PRIVATE_UNDEFINED_NON_LAZY: [node.details appendRow:@"":@"":@"4":@"REFERENCE_FLAG_PRIVATE_UNDEFINED_NON_LAZY"]; break;
case REFERENCE_FLAG_PRIVATE_UNDEFINED_LAZY: [node.details appendRow:@"":@"":@"5":@"REFERENCE_FLAG_PRIVATE_UNDEFINED_LAZY"]; break;
default:
[node.details appendRow:@"":@"":[NSString stringWithFormat:@"%u",nlist_64->n_desc & REFERENCE_TYPE]:@"???"]; break;
}
uint32_t libOrdinal = GET_LIBRARY_ORDINAL(nlist_64->n_desc);
struct dylib const * dylib = [self getDylibByIndex:libOrdinal];
[node.details appendRow:@"":@"":@"Library Ordinal"
:[NSString stringWithFormat:@"%u (%@)",libOrdinal,
libOrdinal == SELF_LIBRARY_ORDINAL ? @"SELF_LIBRARY_ORDINAL" :
libOrdinal == DYNAMIC_LOOKUP_ORDINAL ? @"DYNAMIC_LOOKUP_ORDINAL" :
libOrdinal == EXECUTABLE_ORDINAL ? @"EXECUTABLE_ORDINAL" :
[NSSTRING((uint8_t *)dylib + dylib->name.offset - sizeof(struct load_command)) lastPathComponent]]];
}
if ((nlist_64->n_desc & REFERENCED_DYNAMICALLY) == REFERENCED_DYNAMICALLY) [node.details appendRow:@"":@"":@"0010":@"REFERENCED_DYNAMICALLY"];
if ((nlist_64->n_desc & N_NO_DEAD_STRIP) == N_NO_DEAD_STRIP) [node.details appendRow:@"":@"":@"0020":@"N_NO_DEAD_STRIP"];
if ((nlist_64->n_desc & N_WEAK_REF) == N_WEAK_REF) [node.details appendRow:@"":@"":@"0040":@"N_WEAK_REF"];
if ((nlist_64->n_desc & N_WEAK_DEF) == N_WEAK_DEF) [node.details appendRow:@"":@"":@"0080":
(nlist_64->n_type & N_TYPE) == N_UNDF || (nlist_64->n_type & N_TYPE) == N_PBUD
? @"N_REF_TO_WEAK"
: @"N_WEAK_DEF"];
if ((nlist_64->n_desc & N_SYMBOL_RESOLVER) == N_SYMBOL_RESOLVER) [node.details appendRow:@"":@"":@"0100":@"N_SYMBOL_RESOLVER"];
[dataController read_uint64:range lastReadHex:&lastReadHex];
if ((nlist_64->n_type & N_TYPE) == N_SECT)
{
[node.details appendRow:[NSString stringWithFormat:@"%.8lX", range.location]
:lastReadHex
:@"Value"
:(nlist_64->n_type & N_STAB) || section_64 == NULL
? [NSString stringWithFormat:@"%qu", nlist_64->n_value] : nlist_64->n_value == 0 ? @"0"
: [NSString stringWithFormat:@"%qu ($+%qu)", nlist_64->n_value, nlist_64->n_value - section_64->addr]];
// fill in lookup table with defined sybols
if ((nlist_64->n_type & N_STAB) == 0)
{
// it is possible to associate more than one symbol to the same address.
// every new symbol will be appended to the list
NSString * nameToStore = [symbolNames objectForKey:[NSNumber numberWithUnsignedLongLong:nlist_64->n_value]];
nameToStore = (nameToStore != nil
? [nameToStore stringByAppendingFormat:@"(%@)", symbolName]