dyldInitialization.cpp [plain text]
#define __STDC_LIMIT_MACROS
#include <stdint.h>
#include <stddef.h>
#include <string.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <mach/mach.h>
#include "dyld2.h"
#include "dyldSyscallInterface.h"
#include "MachOAnalyzer.h"
#include "Tracing.h"
extern "C" void mach_init();
extern "C" void __guard_setup(const char* apple[]);
extern "C" void _subsystem_init(const char* apple[]);
extern void syncProcessInfo();
const dyld::SyscallHelpers* gSyscallHelpers = NULL;
namespace dyldbootstrap {
#define DYLD_INITIALIZER_SUPPORT 0
#if DYLD_INITIALIZER_SUPPORT
typedef void (*Initializer)(int argc, const char* argv[], const char* envp[], const char* apple[]);
extern const Initializer inits_start __asm("section$start$__DATA$__mod_init_func");
extern const Initializer inits_end __asm("section$end$__DATA$__mod_init_func");
static void runDyldInitializers(int argc, const char* argv[], const char* envp[], const char* apple[])
{
for (const Initializer* p = &inits_start; p < &inits_end; ++p) {
(*p)(argc, argv, envp, apple);
}
}
#endif // DYLD_INITIALIZER_SUPPORT
static void rebaseDyld(const dyld3::MachOLoaded* dyldMH)
{
const dyld3::MachOAnalyzer* ma = (dyld3::MachOAnalyzer*)dyldMH;
assert(ma->hasChainedFixups());
uintptr_t slide = (long)ma; __block Diagnostics diag;
ma->withChainStarts(diag, 0, ^(const dyld_chained_starts_in_image* starts) {
ma->fixupAllChainedFixups(diag, starts, slide, dyld3::Array<const void*>(), nullptr);
});
diag.assertNoError();
mach_init();
ma->forEachSegment(^(const dyld3::MachOFile::SegmentInfo& info, bool& stop) {
if ( info.readOnlyData ) {
::mprotect(((uint8_t*)(dyldMH))+info.vmAddr, (size_t)info.vmSize, VM_PROT_READ);
}
});
}
uintptr_t start(const dyld3::MachOLoaded* appsMachHeader, int argc, const char* argv[],
const dyld3::MachOLoaded* dyldsMachHeader, uintptr_t* startGlue)
{
dyld3::kdebug_trace_dyld_marker(DBG_DYLD_TIMING_BOOTSTRAP_START, 0, 0, 0, 0);
rebaseDyld(dyldsMachHeader);
const char** envp = &argv[argc+1];
const char** apple = envp;
while(*apple != NULL) { ++apple; }
++apple;
__guard_setup(apple);
#if DYLD_INITIALIZER_SUPPORT
runDyldInitializers(argc, argv, envp, apple);
#endif
_subsystem_init(apple);
uintptr_t appsSlide = appsMachHeader->getSlide();
return dyld::_main((macho_header*)appsMachHeader, appsSlide, argc, argv, envp, apple, startGlue);
}
#if TARGET_OS_SIMULATOR
extern "C" uintptr_t start_sim(int argc, const char* argv[], const char* envp[], const char* apple[],
const dyld3::MachOLoaded* mainExecutableMH, const dyld3::MachOLoaded* dyldMH, uintptr_t dyldSlide,
const dyld::SyscallHelpers*, uintptr_t* startGlue);
uintptr_t start_sim(int argc, const char* argv[], const char* envp[], const char* apple[],
const dyld3::MachOLoaded* mainExecutableMH, const dyld3::MachOLoaded* dyldSimMH, uintptr_t dyldSlide,
const dyld::SyscallHelpers* sc, uintptr_t* startGlue)
{
gSyscallHelpers = sc;
rebaseDyld(dyldSimMH);
__guard_setup(apple);
dyld::gProcessInfo = (struct dyld_all_image_infos*)(sc->getProcessInfo());
syncProcessInfo();
uintptr_t appsSlide = mainExecutableMH->getSlide();
return dyld::_main((macho_header*)mainExecutableMH, appsSlide, argc, argv, envp, apple, startGlue);
}
#endif
}