dyld/src/glue.c

   1 /* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
   2  *
   3  * Copyright (c) 2004-2010 Apple Inc. All rights reserved.
   4  *
   5  * @APPLE_LICENSE_HEADER_START@
   6  *
   7  * This file contains Original Code and/or Modifications of Original Code
   8  * as defined in and that are subject to the Apple Public Source License
   9  * Version 2.0 (the 'License'). You may not use this file except in
  10  * compliance with the License. Please obtain a copy of the License at
  11  * http://www.opensource.apple.com/apsl/ and read it before using this
  12  * file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  19  * Please see the License for the specific language governing rights and
  20  * limitations under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24
  25 #include <stddef.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <time.h>
  29 #include <unistd.h>
  30 #include <stdarg.h>
  31 #include <stdio.h>
  32 #include <mach/mach_error.h>
  33
  34 // from _simple.h in libc
  35 typedef struct _SIMPLE* _SIMPLE_STRING;
  36 extern void                             _simple_vdprintf(int __fd, const char *__fmt, va_list __ap);
  37 extern void                             _simple_dprintf(int __fd, const char *__fmt, ...);
  38 extern _SIMPLE_STRING   _simple_salloc(void);
  39 extern int                              _simple_vsprintf(_SIMPLE_STRING __b, const char *__fmt, va_list __ap);
  40 extern void                             _simple_sfree(_SIMPLE_STRING __b);
  41 extern char *                   _simple_string(_SIMPLE_STRING __b);
  42
  43 // dyld::log(const char* format, ...)
  44 extern void _ZN4dyld3logEPKcz(const char*, ...);
  45
  46 // dyld::halt(const char* msg);
  47 extern void _ZN4dyld4haltEPKc(const char* msg) __attribute__((noreturn));
  48
  49
  50 // abort called by C++ unwinding code
  51 void abort()
  52 {
  53         _ZN4dyld4haltEPKc("dyld calling abort()\n");
  54 }
  55
  56 // std::terminate called by C++ unwinding code
  57 void _ZSt9terminatev()
  58 {
  59         _ZN4dyld4haltEPKc("dyld std::terminate()\n");
  60 }
  61
  62 // std::unexpected called by C++ unwinding code
  63 void _ZSt10unexpectedv()
  64 {
  65         _ZN4dyld4haltEPKc("dyld std::unexpected()\n");
  66 }
  67
  68 // __cxxabiv1::__terminate(void (*)()) called to terminate process
  69 void _ZN10__cxxabiv111__terminateEPFvvE()
  70 {
  71         _ZN4dyld4haltEPKc("dyld std::__terminate()\n");
  72 }
  73
  74 // __cxxabiv1::__unexpected(void (*)()) called to terminate process
  75 void _ZN10__cxxabiv112__unexpectedEPFvvE()
  76 {
  77         _ZN4dyld4haltEPKc("dyld std::__unexpected()\n");
  78 }
  79
  80 // __cxxabiv1::__terminate_handler
  81 void* _ZN10__cxxabiv119__terminate_handlerE  = &_ZSt9terminatev;
  82
  83 // __cxxabiv1::__unexpected_handler
  84 void* _ZN10__cxxabiv120__unexpected_handlerE = &_ZSt10unexpectedv;
  85
  86 // libc uses assert()
  87 void __assert_rtn(const char* func, const char* file, int line, const char* failedexpr)
  88 {
  89         if (func == NULL)
  90                 _ZN4dyld3logEPKcz("Assertion failed: (%s), file %s, line %d.\n", failedexpr, file, line);
  91         else
  92                 _ZN4dyld3logEPKcz("Assertion failed: (%s), function %s, file %s, line %d.\n", failedexpr, func, file, line);
  93         abort();
  94 }
  95
  96
  97 // called by libuwind code before aborting
  98 size_t fwrite(const void* ptr, size_t size, size_t nitme, FILE* stream)
  99 {
 100         return fprintf(stream, "%s", (char*)ptr);
 101 }
 102
 103 // called by libuwind code before aborting
 104 int     fprintf(FILE* file, const char* format, ...)
 105 {
 106         va_list list;
 107         va_start(list, format);
 108         _simple_vdprintf(STDERR_FILENO, format, list);
 109         va_end(list);
 110         return 0;
 111 }
 112
 113 // called by LIBC_ABORT
 114 void abort_report_np(const char* format, ...)
 115 {
 116         va_list list;
 117         const char *str;
 118         _SIMPLE_STRING s = _simple_salloc();
 119         if ( s != NULL ) {
 120                 va_start(list, format);
 121                 _simple_vsprintf(s, format, list);
 122                 va_end(list);
 123                 str = _simple_string(s);
 124         }
 125         else {
 126                 // _simple_salloc failed, but at least format may have useful info by itself
 127                 str = format;
 128         }
 129         _ZN4dyld4haltEPKc(str);
 130         // _ZN4dyld4haltEPKc doesn't return, so we can't call _simple_sfree
 131 }
 132
 133
 134 // real cthread_set_errno_self() has error handling that pulls in
 135 // pthread_exit() which pulls in fprintf()
 136 extern int* __error(void);
 137 void cthread_set_errno_self(int err)
 138 {
 139         int* ep = __error();
 140      *ep = err;
 141 }
 142
 143 /*
 144  * We have our own localtime() to avoid needing the notify API which is used
 145  * by the code in libc.a for localtime() which is used by arc4random().
 146  */
 147 struct tm* localtime(const time_t* t)
 148 {
 149         return (struct tm*)NULL;
 150 }
 151
 152 // malloc calls exit(-1) in case of errors...
 153 void exit(int x)
 154 {
 155         _ZN4dyld4haltEPKc("exit()");
 156 }
 157
 158 // static initializers make calls to __cxa_atexit
 159 void __cxa_atexit()
 160 {
 161         // do nothing, dyld never terminates
 162 }
 163
 164 //
 165 // The stack protector routines in lib.c bring in too much stuff, so
 166 // make our own custom ones.
 167 //
 168 long __stack_chk_guard = 0;
 169 static __attribute__((constructor))
 170 void __guard_setup(int argc, const char* argv[], const char* envp[], const char* apple[])
 171 {
 172         for (const char** p = apple; *p != NULL; ++p) {
 173                 if ( strncmp(*p, "stack_guard=", 12) == 0 ) {
 174                         // kernel has provide a random value for us
 175                         for (const char* s = *p + 12; *s != '\0'; ++s) {
 176                                 char c = *s;
 177                                 long value = 0;
 178                                 if ( (c >= 'a') && (c <= 'f') )
 179                                         value = c - 'a' + 10;
 180                                 else if ( (c >= 'A') && (c <= 'F') )
 181                                         value = c - 'A' + 10;
 182                                 else if ( (c >= '0') && (c <= '9') )
 183                                         value = c - '0';
 184                                 __stack_chk_guard <<= 4;
 185                                 __stack_chk_guard |= value;
 186                         }
 187                         if ( __stack_chk_guard != 0 )
 188                                 return;
 189                 }
 190         }
 191
 192 #if __LP64__
 193         __stack_chk_guard = ((long)arc4random() << 32) | arc4random();
 194 #else
 195         __stack_chk_guard = arc4random();
 196 #endif
 197 }
 198 extern void _ZN4dyld4haltEPKc(const char*);
 199 void __stack_chk_fail()
 200 {
 201         _ZN4dyld4haltEPKc("stack buffer overrun");
 202 }
 203
 204
 205 // std::_throw_bad_alloc()
 206 void _ZSt17__throw_bad_allocv()
 207 {
 208         _ZN4dyld4haltEPKc("__throw_bad_alloc()");
 209 }
 210
 211 // std::_throw_length_error(const char* x)
 212 void _ZSt20__throw_length_errorPKc()
 213 {
 214         _ZN4dyld4haltEPKc("_throw_length_error()");
 215 }
 216
 217 // the libc.a version of this drags in ASL
 218 void __chk_fail()
 219 {
 220         _ZN4dyld4haltEPKc("__chk_fail()");
 221 }
 222
 223
 224 // referenced by libc.a(pthread.o) but unneeded in dyld
 225 void _init_cpu_capabilities() { }
 226 void _cpu_capabilities() {}
 227 void set_malloc_singlethreaded() {}
 228 int PR_5243343_flag = 0;
 229
 230
 231 // used by some pthread routines
 232 char* mach_error_string(mach_error_t err)
 233 {
 234         return (char *)"unknown error code";
 235 }
 236 char* mach_error_type(mach_error_t err)
 237 {
 238         return (char *)"(unknown/unknown)";
 239 }
 240
 241 // _pthread_reap_thread calls fprintf(stderr).
 242 // We map fprint to _simple_vdprintf and ignore FILE* stream, so ok for it to be NULL
 243 #if !__ppc__
 244 FILE* __stderrp = NULL;
 245 FILE* __stdoutp = NULL;
 246 #endif
 247
 248 // work with c++abi.a
 249 void (*__cxa_terminate_handler)() = _ZSt9terminatev;
 250 void (*__cxa_unexpected_handler)() = _ZSt10unexpectedv;
 251
 252 void abort_message(const char* format, ...)
 253 {
 254         va_list list;
 255         va_start(list, format);
 256         _simple_vdprintf(STDERR_FILENO, format, list);
 257         va_end(list);
 258 }
 259
 260 void __cxa_bad_typeid()
 261 {
 262         _ZN4dyld4haltEPKc("__cxa_bad_typeid()");
 263 }