#include <stddef.h>
#include <string.h>
#include <stdlib.h>
+#include <Availability.h>
#include <mach/mach.h>
#include <mach-o/loader.h>
#include <mach-o/ldsyms.h>
#include <mach-o/reloc.h>
-#if __ppc__ || __ppc64__
- #include <mach-o/ppc/reloc.h>
-#endif
#if __x86_64__
#include <mach-o/x86_64/reloc.h>
#endif
#include "dyld.h"
+#include "dyldSyscallInterface.h"
+
+// from dyld_gdb.cpp
+extern void addImagesToAllImages(uint32_t infoCount, const dyld_image_info info[]);
+extern void syncProcessInfo();
#ifndef MH_PIE
#define MH_PIE 0x200000
#endif
+// currently dyld has no initializers, but if some come back, set this to non-zero
+#define DYLD_INITIALIZER_SUPPORT 0
#if __LP64__
#define LC_SEGMENT_COMMAND LC_SEGMENT_64
#define POINTER_RELOC GENERIC_RELOC_VANILLA
#endif
-// from dyld.cpp
-namespace dyld { extern bool isRosetta(); };
+
+#if TARGET_IPHONE_SIMULATOR
+const dyld::SyscallHelpers* gSyscallHelpers = NULL;
+#endif
//
namespace dyldbootstrap {
+
+#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");
+
//
// For a regular executable, the crt code calls dyld to run the executables initializers.
// For a static executable, crt directly runs the initializers.
//
static void runDyldInitializers(const struct macho_header* mh, intptr_t slide, int argc, const char* argv[], const char* envp[], const char* apple[])
{
- const uint32_t cmd_count = mh->ncmds;
- const struct load_command* const cmds = (struct load_command*)(((char*)mh)+sizeof(macho_header));
- const struct load_command* cmd = cmds;
- for (uint32_t i = 0; i < cmd_count; ++i) {
- switch (cmd->cmd) {
- case LC_SEGMENT_COMMAND:
- {
- const struct macho_segment_command* seg = (struct macho_segment_command*)cmd;
- const struct macho_section* const sectionsStart = (struct macho_section*)((char*)seg + sizeof(struct macho_segment_command));
- const struct macho_section* const sectionsEnd = §ionsStart[seg->nsects];
- for (const struct macho_section* sect=sectionsStart; sect < sectionsEnd; ++sect) {
- const uint8_t type = sect->flags & SECTION_TYPE;
- if ( type == S_MOD_INIT_FUNC_POINTERS ){
- Initializer* inits = (Initializer*)(sect->addr + slide);
- const uint32_t count = sect->size / sizeof(uintptr_t);
- for (uint32_t i=0; i < count; ++i) {
- Initializer func = inits[i];
- func(argc, argv, envp, apple);
- }
- }
- }
- }
- break;
- }
- cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
+ for (const Initializer* p = &inits_start; p < &inits_end; ++p) {
+ (*p)(argc, argv, envp, apple);
}
}
+#endif // DYLD_INITIALIZER_SUPPORT
//
const uint8_t type = sect->flags & SECTION_TYPE;
if ( type == S_NON_LAZY_SYMBOL_POINTERS ) {
// rebase non-lazy pointers (which all point internal to dyld, since dyld uses no shared libraries)
- const uint32_t pointerCount = sect->size / sizeof(uintptr_t);
+ const uint32_t pointerCount = (uint32_t)(sect->size / sizeof(uintptr_t));
uintptr_t* const symbolPointers = (uintptr_t*)(sect->addr + slide);
for (uint32_t j=0; j < pointerCount; ++j) {
symbolPointers[j] += slide;
const relocation_info* const relocsStart = (struct relocation_info*)(linkEditSeg->vmaddr + slide + dynamicSymbolTable->locreloff - linkEditSeg->fileoff);
const relocation_info* const relocsEnd = &relocsStart[dynamicSymbolTable->nlocrel];
for (const relocation_info* reloc=relocsStart; reloc < relocsEnd; ++reloc) {
- #if __ppc__ || __ppc64__ || __i36__
- if ( (reloc->r_address & R_SCATTERED) != 0 )
- throw "scattered relocation in dyld";
- #endif
if ( reloc->r_length != RELOC_SIZE )
throw "relocation in dyld has wrong size";
}
-extern "C" void dyld_exceptions_init(const struct macho_header*, uintptr_t slide); // in dyldExceptions.cpp
extern "C" void mach_init();
-
-//
-// _pthread_keys is partitioned in a lower part that dyld will use; libSystem
-// will use the upper part. We set __pthread_tsd_first to 1 as the start of
-// the lower part. Libc will take #1 and c++ exceptions will take #2. There
-// is one free key=3 left.
-//
-extern "C" {
- extern int __pthread_tsd_first;
- extern void _pthread_keys_init();
-}
+extern "C" void __guard_setup(const char* apple[]);
//
// In dyld we have to do this manually.
//
uintptr_t start(const struct macho_header* appsMachHeader, int argc, const char* argv[],
- intptr_t slide, const struct macho_header* dyldsMachHeader)
+ intptr_t slide, const struct macho_header* dyldsMachHeader,
+ uintptr_t* startGlue)
{
// if kernel had to slide dyld, we need to fix up load sensitive locations
// we have to do this before using any global variables
rebaseDyld(dyldsMachHeader, slide);
}
-#if __IPHONE_OS_VERSION_MIN_REQUIRED
- // set pthread keys to dyld range
- __pthread_tsd_first = 1;
- _pthread_keys_init();
-#endif
-
- // enable C++ exceptions to work inside dyld
- dyld_exceptions_init(dyldsMachHeader, slide);
-
// allow dyld to use mach messaging
mach_init();
while(*apple != NULL) { ++apple; }
++apple;
+ // set up random value for stack canary
+ __guard_setup(apple);
+
+#if DYLD_INITIALIZER_SUPPORT
// run all C++ initializers inside dyld
runDyldInitializers(dyldsMachHeader, slide, argc, argv, envp, apple);
-
+#endif
+
// now that we are done bootstrapping dyld, call dyld's main
uintptr_t appsSlide = slideOfMainExecutable(appsMachHeader);
- return dyld::_main(appsMachHeader, appsSlide, argc, argv, envp, apple);
+ return dyld::_main(appsMachHeader, appsSlide, argc, argv, envp, apple, startGlue);
}
+#if TARGET_IPHONE_SIMULATOR
+
+extern "C" uintptr_t start_sim(int argc, const char* argv[], const char* envp[], const char* apple[],
+ const macho_header* mainExecutableMH, const macho_header* 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 macho_header* mainExecutableMH, const macho_header* dyldMH, uintptr_t dyldSlide,
+ const dyld::SyscallHelpers* sc, uintptr_t* startGlue)
+{
+ // if simulator dyld loaded slid, it needs to rebase itself
+ // we have to do this before using any global variables
+ if ( dyldSlide != 0 ) {
+ rebaseDyld(dyldMH, dyldSlide);
+ }
+
+ // save table of syscall pointers
+ gSyscallHelpers = sc;
+
+ // allow dyld to use mach messaging
+ mach_init();
+
+ // set up random value for stack canary
+ __guard_setup(apple);
+
+ // setup gProcessInfo to point to host dyld's struct
+ dyld::gProcessInfo = (struct dyld_all_image_infos*)(sc->getProcessInfo());
+ syncProcessInfo();
+
+ // now that we are done bootstrapping dyld, call dyld's main
+ uintptr_t appsSlide = slideOfMainExecutable(mainExecutableMH);
+ return dyld::_main(mainExecutableMH, appsSlide, argc, argv, envp, apple, startGlue);
+}
+#endif
} // end of namespace
projects / apple / dyld.git / blobdiff