1/* 2 * Copyright (c) 1999-2007 Apple Inc. All rights reserved. 3 * 4 * @APPLE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. Please obtain a copy of the License at 10 * http://www.opensource.apple.com/apsl/ and read it before using this 11 * file. 12 * 13 * The Original Code and all software distributed under the License are 14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 18 * Please see the License for the specific language governing rights and 19 * limitations under the License. 20 * 21 * @APPLE_LICENSE_HEADER_END@ 22 */ 23/* 24** This file contains interfaces to the symbols defined int the crt modules. 25** 3 April 1995 26** Matt Watson (mwatson@next.com) 27** 28*/ 29 30#if defined(__DYNAMIC__) 31#include "mach-o/dyld.h" /* defines _dyld_lookup_and_bind() */ 32#define DECLARE_VAR(var, type) \ 33 static type * var ## _pointer = 0 34#define DECLARE_PROGNAME(var, type) \ 35 static type * var ## _pointer = 0; \ 36 static type _priv_ ## var = 0 37#define USE_VAR(var) (var ## _pointer) 38#else 39#define DECLARE_VAR(var, type) extern type var 40#define DECLARE_PROGNAME(var, type) DECLARE_VAR(var, type) 41#define USE_VAR(var) (& var) 42#endif 43 44DECLARE_VAR(NXArgv, char **); 45DECLARE_VAR(NXArgc, int); 46DECLARE_VAR(environ, char **); 47DECLARE_VAR(_mh_execute_header, struct mach_header); 48DECLARE_PROGNAME(__progname, char *); 49 50char ***_NSGetArgv(void) { 51 return(USE_VAR(NXArgv)); 52} 53 54int *_NSGetArgc(void) { 55 return(USE_VAR(NXArgc)); 56} 57 58char ***_NSGetEnviron(void) { 59 return(USE_VAR(environ)); 60} 61 62char **_NSGetProgname(void) { 63 return(USE_VAR(__progname)); 64} 65 66struct mach_header *_NSGetMachExecuteHeader(void) { 67 return(USE_VAR(_mh_execute_header)); 68} 69 70#if __DYNAMIC__ 71struct ProgramVars 72{ 73 void* mh; 74 int* NXArgcPtr; 75 char*** NXArgvPtr; 76 char*** environPtr; 77 char** __prognamePtr; 78}; 79 80 81#define SUPPORT_PRE_GM_10_5_EXECUTABLES (__ppc__ || __i386__) 82 83 84/* 85 * dyld calls libSystem_initializer() and passes it a ProgramVars struct containing pointers to the 86 * main executable's NXArg* global variables. libSystem_initializer() calls __libc_init() which calls 87 * _program_vars_init() passing the ProgramVars parameter. 88 */ 89void __attribute__((visibility("hidden"))) 90_program_vars_init(const struct ProgramVars* vars) { 91#if SUPPORT_PRE_GM_10_5_EXECUTABLES 92 // to support transitional 10.5 main executables that don't have extended __dyld section and instead call _NSSetProgramVars, 93 // don't overwrite values set by _NSSetProgramVars() 94 if ( NXArgv_pointer != NULL ) 95 return; 96#endif 97 NXArgv_pointer = vars->NXArgvPtr; 98 NXArgc_pointer = vars->NXArgcPtr; 99 environ_pointer = vars->environPtr; 100 __progname_pointer = vars->__prognamePtr; 101 _mh_execute_header_pointer = vars->mh; 102} 103 104#if SUPPORT_PRE_GM_10_5_EXECUTABLES 105/* 106 * This is only called by main executables built with pre 10-5 GM crt1.10.5.o. In those programs, 107 * there is no extended __dyld section, dyld cannot tell _program_vars_init() where the real program 108 * variables are, so they get temp values and are set for real here. 109 */ 110void _NSSetProgramVars(int* crt_argc, char*** crt_argv, char*** crt_environ, struct mach_header* crt_mh, char** crt_progname) { 111 NXArgv_pointer = crt_argv; 112 NXArgc_pointer = crt_argc; 113 environ_pointer = crt_environ; 114 __progname_pointer = crt_progname; 115 _mh_execute_header_pointer = crt_mh; 116} 117#endif 118#endif /* __DYNAMIC__ */ 119 120#if __ppc__ 121/* 122 * Fix for Radar bug 2200596 -- 123 * EH symbol definitions for gcc 2.7.2.x implementation of 124 * C++ exception handling. The problem: the EH implementation 125 * has "throw" store stuff into these pointers, and then as the 126 * stack is unwound, the code generated into each function (for 127 * checking whether this function contains a relevant "catch" 128 * clause and for calling destructors for local variables) looks 129 * at these globals to find the type and value thrown. 130 * 131 * The problem was that the compiler generated the symbols as 132 * "common" symbols, and common symbols cannot be placed in 133 * dynamic shared libraries. So we must put these guys as 134 * "data" symbols into crt0.o or the System Framework (library), 135 * and the compiler must generate code that defines the symbols 136 * as external references instead of common. 137 * 138 * I changed the symbol names (added the "_272") to be utterly 139 * paranoid about any possible future use of similar names by 140 * any future versions of gcc. 141 * -- D. Landauer, Jan. 1998 142 */ 143 144void *__eh_pc_gcc_272 = (void *)0; 145void *__eh_type_gcc_272 = (void *)0; 146void *__eh_value_gcc_272 = (void *)0; 147 148/* This is what egcs uses for its global data pointer */ 149void *__eh_global_dataptr = (void *)0; 150#endif /* __ppc__ */ 151 152