/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
*
- * Copyright (c) 2004-2005 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2004-2011 Apple Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
#include <string.h>
#include <mach-o/loader.h>
#include <unistd.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <stdarg.h>
+#include <pthread.h>
+#include <Availability.h>
+#include <mach-o/dyld_priv.h>
-//
-// BEGIN copy of code from libgcc.a source file unwind-dw2-fde-darwin.c
-//
-#define KEYMGR_API_MAJOR_GCC3 3
-/* ... with these keys. */
-#define KEYMGR_GCC3_LIVE_IMAGE_LIST 301 /* loaded images */
-#define KEYMGR_GCC3_DW2_OBJ_LIST 302 /* Dwarf2 object list */
-#define KEYMGR_EH_GLOBALS_KEY 13
-
-/* Node of KEYMGR_GCC3_LIVE_IMAGE_LIST. Info about each resident image. */
-struct live_images {
- unsigned long this_size; /* sizeof (live_images) */
- struct mach_header *mh; /* the image info */
- unsigned long vm_slide;
- void (*destructor)(struct live_images *); /* destructor for this */
- struct live_images *next;
- unsigned int examined_p;
- void *fde;
- void *object_info;
- unsigned long info[2]; /* Future use. */
-};
-//
-// END copy of code from libgcc.a source file unwind-dw2-fde-darwin.c
-//
+#include "dyldLibSystemInterface.h"
+
+
+extern void _ZN4dyld3logEPKcz(const char*, ...);
+extern struct LibSystemHelpers* _ZN4dyld17gLibSystemHelpersE;
+
+
+#if __LP64__
+ #define LC_SEGMENT_COMMAND LC_SEGMENT_64
+ #define macho_header mach_header_64
+ #define macho_segment_command segment_command_64
+ #define macho_section section_64
+ #define getsectdatafromheader getsectdatafromheader_64
+#else
+ #define LC_SEGMENT_COMMAND LC_SEGMENT
+ #define macho_header mach_header
+ #define macho_segment_command segment_command
+ #define macho_section section
+#endif
//
-// dyld is built as stand alone executable with a static copy of libc, libstdc++, and libgcc.
+// The standard versions of __cxa_get_globals*() from libstdc++-static.a cannot be used.
+// On Mac OS X, they use keymgr which dyld does not implement.
+// On iPhoneOS, they use pthread_key_create which dyld cannot use.
//
-// In order for C++ exceptions to work within dyld, the C++ exception handling code
-// must be able to find the exception handling frame data inside dyld. The standard
-// exception handling code uses crt and keymgr to keep track of all images and calls
-// getsectdatafromheader("__eh_frame") to find the EH data for each image. We implement
-// our own copy of those functions below to enable exceptions within dyld.
+// Implement these ourselves to make upcalls into libSystem to malloc and create a pthread key
//
-// Note: This exception handling is completely separate from any user code exception .
-// handling which has its own keymgr (in libSystem).
-//
+static pthread_key_t sCxaKey = 0;
+static char sPreMainCxaGlobals[2*sizeof(long)];
+
+// called by libstdc++.a
+char* __cxa_get_globals()
+{
+ // if libSystem.dylib not yet initialized, or is old libSystem, use shared global
+ if ( (_ZN4dyld17gLibSystemHelpersE == NULL) || (_ZN4dyld17gLibSystemHelpersE->version < 7) )
+ return sPreMainCxaGlobals;
+
+ if ( sCxaKey == 0 ) {
+ // create key
+ // we don't need a lock because only one thread can be in dyld at a time
+ _ZN4dyld17gLibSystemHelpersE->pthread_key_create(&sCxaKey, &free);
+ }
+ char* data = (char*)_ZN4dyld17gLibSystemHelpersE->pthread_getspecific(sCxaKey);
+ if ( data == NULL ) {
+ long* t = (long*)calloc(2,sizeof(long));
+ data = (char*)t;
+ _ZN4dyld17gLibSystemHelpersE->pthread_setspecific(sCxaKey, data);
+ }
+ return data;
+}
+// called by libstdc++.a
+char* __cxa_get_globals_fast()
+{
+ // if libSystem.dylib not yet initialized, or is old libSystem, use shared global
+ if ( (_ZN4dyld17gLibSystemHelpersE == NULL) || (_ZN4dyld17gLibSystemHelpersE->version < 7) )
+ return sPreMainCxaGlobals;
-static struct live_images sDyldImage; // zero filled
-static void* sObjectList = NULL;
-#if defined(__GNUC__) && (((__GNUC__ == 3) && (__GNUC_MINOR__ >= 5)) || (__GNUC__ >= 4))
-static void* sEHGlobals = NULL;
-#endif
+ return _ZN4dyld17gLibSystemHelpersE->pthread_getspecific(sCxaKey);
+}
-// called by dyldStartup.s very early
-void dyld_exceptions_init(struct mach_header *mh, uintptr_t slide)
-{
- sDyldImage.this_size = sizeof(struct live_images);
- sDyldImage.mh = mh;
- sDyldImage.vm_slide = slide;
-}
+#if !__USING_SJLJ_EXCEPTIONS__
+//
+// When dyld uses zero-cost exceptions it just needs to implement
+// _dyld_find_unwind_sections to return sections inside dyld proper.
+//
+extern void* ehStart __asm("section$start$__TEXT$__eh_frame");
+extern void* ehEnd __asm("section$end$__TEXT$__eh_frame");
+extern void* uwStart __asm("section$start$__TEXT$__unwind_info");
+extern void* uwEnd __asm("section$end$__TEXT$__unwind_info");
-// Hack for gcc 3.5's use of keymgr includes accessing __keymgr_global
-#if defined(__GNUC__) && (((__GNUC__ == 3) && (__GNUC_MINOR__ >= 5)) || (__GNUC__ >= 4))
-typedef struct Sinfo_Node {
- uint32_t size; /* Size of this node. */
- uint16_t major_version; /* API major version. */
- uint16_t minor_version; /* API minor version. */
-} Tinfo_Node;
-static const Tinfo_Node keymgr_info = { sizeof (Tinfo_Node), KEYMGR_API_MAJOR_GCC3, 0 };
-const Tinfo_Node* __keymgr_global[3] = { NULL, NULL, &keymgr_info };
-#endif
+extern void* textStart __asm("section$start$__TEXT$__text");
+extern void* textEnd __asm("section$end$__TEXT$__text");
-static __attribute__((noreturn))
-void dyld_abort()
-{
- //dyld::log("internal dyld error\n");
- _exit(1);
-}
+extern void* __dso_handle;
-void* _keymgr_get_and_lock_processwide_ptr(unsigned int key)
+// called by libuwind code to find unwind information sections in dyld
+bool _dyld_find_unwind_sections(void* addr, struct dyld_unwind_sections* info)
{
- // The C++ exception handling code uses two keys. No other keys should be seen
- if ( key == KEYMGR_GCC3_LIVE_IMAGE_LIST ) {
- return &sDyldImage;
+ if ( ((void*)&textStart < addr) && (addr < (void*)&textEnd) ) {
+ info->mh = (struct mach_header*)&__dso_handle;
+ info->dwarf_section = &ehStart;
+ info->dwarf_section_length = ((char*)&ehEnd - (char*)&ehStart);
+ info->compact_unwind_section = &uwStart;
+ info->compact_unwind_section_length = ((char*)&uwEnd - (char*)&uwStart);
+ return true;
}
- else if ( key == KEYMGR_GCC3_DW2_OBJ_LIST ) {
- return sObjectList;
+ else {
+ return false;
}
- dyld_abort();
}
-void _keymgr_set_and_unlock_processwide_ptr(unsigned int key, void* value)
-{
- // The C++ exception handling code uses just this key. No other keys should be seen
- if ( key == KEYMGR_GCC3_DW2_OBJ_LIST ) {
- sObjectList = value;
- return;
- }
- dyld_abort();
-}
+#else
+//
+// When dyld uses setjump-longjump exceptions it needs to implement
+// routines to push and pop a stack of _Unwind_FunctionContext.
+//
-void _keymgr_unlock_processwide_ptr(unsigned int key)
+struct _Unwind_FunctionContext
{
- // The C++ exception handling code uses just this key. No other keys should be seen
- if ( key == KEYMGR_GCC3_LIVE_IMAGE_LIST ) {
- return;
- }
- dyld_abort();
-}
-
-void* _keymgr_get_per_thread_data(unsigned int key)
-{
-#if defined(__GNUC__) && (((__GNUC__ == 3) && (__GNUC_MINOR__ >= 5)) || (__GNUC__ >= 4))
- // gcc 3.5 and later use this key
- if ( key == KEYMGR_EH_GLOBALS_KEY )
- return sEHGlobals;
-#endif
+ // next function in stack of handlers
+ struct _Unwind_FunctionContext* prev;
- // used by std::termination which dyld does not use
- dyld_abort();
-}
+};
-void _keymgr_set_per_thread_data(unsigned int key, void *keydata)
+
+static pthread_key_t sThreadChainKey = 0;
+static struct _Unwind_FunctionContext* sStaticThreadChain = NULL;
+
+//
+// When libSystem's initializers are run, they call back into dyld's
+// registerThreadHelpers which creates a pthread key and calls
+// __Unwind_SjLj_SetThreadKey().
+//
+void __Unwind_SjLj_SetThreadKey(pthread_key_t key)
{
-#if defined(__GNUC__) && (((__GNUC__ == 3) && (__GNUC_MINOR__ >= 5)) || (__GNUC__ >= 4))
- // gcc 3.5 and later use this key
- if ( key == KEYMGR_EH_GLOBALS_KEY ) {
- sEHGlobals = keydata;
- return;
- }
-#endif
- // used by std::termination which dyld does not use
- dyld_abort();
+ sThreadChainKey = key;
+ //_ZN4dyld3logEPKcz("__Unwind_SjLj_SetThreadKey(key=%d), sStaticThreadChain=%p\n", key, sStaticThreadChain);
+ // switch static chain to be per thread
+ _ZN4dyld17gLibSystemHelpersE->pthread_setspecific(sThreadChainKey, sStaticThreadChain);
+ sStaticThreadChain = NULL;
+ //_ZN4dyld3logEPKcz("__Unwind_SjLj_SetThreadKey(key=%d), result=%d, new top=%p\n", key, result, pthread_getspecific(sThreadChainKey));
}
-#if __LP64__
- #define LC_SEGMENT_COMMAND LC_SEGMENT_64
- #define macho_header mach_header_64
- #define macho_segment_command segment_command_64
- #define macho_section section_64
- #define getsectdatafromheader getsectdatafromheader_64
-#else
- #define LC_SEGMENT_COMMAND LC_SEGMENT
- #define macho_header mach_header
- #define macho_segment_command segment_command
- #define macho_section section
-#endif
-// needed by C++ exception handling code to find __eh_frame section
-const void* getsectdatafromheader(struct mach_header* mh, const char* segname, const char* sectname, unsigned long* size)
+//static void printChain()
+//{
+// _ZN4dyld3logEPKcz("chain: ");
+// struct _Unwind_FunctionContext* start = sStaticThreadChain;
+// if ( sThreadChainKey != 0 ) {
+// start = (struct _Unwind_FunctionContext*)pthread_getspecific(sThreadChainKey);
+// }
+// for (struct _Unwind_FunctionContext* p = start; p != NULL; p = p->prev) {
+// _ZN4dyld3logEPKcz("%p -> ", p);
+// }
+// _ZN4dyld3logEPKcz("\n");
+//}
+
+
+struct _Unwind_FunctionContext* __Unwind_SjLj_GetTopOfFunctionStack()
{
- const struct load_command* cmd;
- unsigned long i;
-
- cmd = (struct load_command*) ((char *)mh + sizeof(struct macho_header));
- for(i = 0; i < mh->ncmds; i++) {
- if ( cmd->cmd == LC_SEGMENT_COMMAND ) {
- const struct macho_segment_command* seg = (struct macho_segment_command*)cmd;
- if ( strcmp(seg->segname, segname) == 0 ) {
- const struct macho_section* sect = (struct macho_section*)( (char*)seg + sizeof(struct macho_segment_command) );
- unsigned long j;
- for (j = 0; j < seg->nsects; j++) {
- if ( strcmp(sect[j].sectname, sectname) == 0 ) {
- *size = sect[j].size;
- return (void*)(sect[j].addr);
- }
- }
- }
- }
- cmd = (struct load_command*)( (char*)cmd + cmd->cmdsize );
+ //_ZN4dyld3logEPKcz("__Unwind_SjLj_GetTopOfFunctionStack(), key=%d, ", sThreadChainKey);
+ //printChain();
+ if ( sThreadChainKey != 0 ) {
+ return (struct _Unwind_FunctionContext*)pthread_getspecific(sThreadChainKey);
+ }
+ else {
+ return sStaticThreadChain;
}
- return NULL;
}
+void __Unwind_SjLj_SetTopOfFunctionStack(struct _Unwind_FunctionContext* fc)
+{
+ //_ZN4dyld3logEPKcz("__Unwind_SjLj_SetTopOfFunctionStack(%p), key=%d, prev=%p\n",
+ // fc, sThreadChainKey, (fc != NULL) ? fc->prev : NULL);
+ if ( sThreadChainKey != 0 )
+ _ZN4dyld17gLibSystemHelpersE->pthread_setspecific(sThreadChainKey, fc);
+ else
+ sStaticThreadChain = fc;
+ //_ZN4dyld3logEPKcz("__Unwind_SjLj_SetTopOfFunctionStack(%p), key=%d, ", fc, sThreadChainKey);
+ //printChain();
+}
-// Hack for transition of rdar://problem/3933738
-// Can be removed later.
-// Allow C++ runtime to call getsectdatafromheader or getsectdatafromheader_64
-#if __LP64__
- #undef getsectdatafromheader
- const void* getsectdatafromheader(struct mach_header* mh, const char* segname, const char* sectname, unsigned long* size)
- {
- return getsectdatafromheader_64(mh, segname, sectname, size);
- }
#endif
+
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