194 lines
6.5 KiB
C++
194 lines
6.5 KiB
C++
/* _cygwin_crt0_common.cc: common crt0 function for cygwin crt0's.
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Copyright 2000, 2001, 2002, 2003, 2004, 2009, 2010, 2011, 2012, 2013
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Red Hat, Inc.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include "winsup.h"
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#include "crt0.h"
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#include "cygwin-cxx.h"
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/* Weaken these declarations so the references don't pull in C++ dependencies
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unnecessarily. */
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#define WEAK __attribute__ ((weak))
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#ifdef __x86_64__
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#define REAL_ZNWX "__real__Znwm"
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#define REAL_ZNAX "__real__Znam"
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#define REAL_ZNWX_NOTHROW_T "__real__ZnwmRKSt9nothrow_t"
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#define REAL_ZNAX_NOTHROW_T "__real__ZnamRKSt9nothrow_t"
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#else
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#define REAL_ZNWX "___real__Znwj"
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#define REAL_ZNAX "___real__Znaj"
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#define REAL_ZNWX_NOTHROW_T "___real__ZnwjRKSt9nothrow_t"
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#define REAL_ZNAX_NOTHROW_T "___real__ZnajRKSt9nothrow_t"
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#endif
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#define REAL_ZDLPV _SYMSTR (__real__ZdlPv)
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#define REAL_ZDAPV _SYMSTR (__real__ZdaPv)
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#define REAL_ZDLPV_NOTHROW_T _SYMSTR (__real__ZdlPvRKSt9nothrow_t)
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#define REAL_ZDAPV_NOTHROW_T _SYMSTR (__real__ZdaPvRKSt9nothrow_t)
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/* Use asm names to bypass the --wrap that is being applied to redirect all other
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references to these operators toward the redirectors in the Cygwin DLL; this
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way we can record what definitions were visible at final link time but still
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send all calls to the redirectors. */
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extern WEAK void *operator new(std::size_t sz) throw (std::bad_alloc)
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__asm__ (REAL_ZNWX);
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extern WEAK void *operator new[](std::size_t sz) throw (std::bad_alloc)
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__asm__ (REAL_ZNAX);
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extern WEAK void operator delete(void *p) throw()
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__asm__ (REAL_ZDLPV);
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extern WEAK void operator delete[](void *p) throw()
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__asm__ (REAL_ZDAPV);
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extern WEAK void *operator new(std::size_t sz, const std::nothrow_t &nt) throw()
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__asm__ (REAL_ZNWX_NOTHROW_T);
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extern WEAK void *operator new[](std::size_t sz, const std::nothrow_t &nt) throw()
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__asm__ (REAL_ZNAX_NOTHROW_T);
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extern WEAK void operator delete(void *p, const std::nothrow_t &nt) throw()
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__asm__ (REAL_ZDLPV_NOTHROW_T);
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extern WEAK void operator delete[](void *p, const std::nothrow_t &nt) throw()
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__asm__ (REAL_ZDAPV_NOTHROW_T);
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/* Avoid an info message from linker when linking applications. */
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extern __declspec(dllimport) struct _reent *_impure_ptr;
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/* Initialised in _cygwin_dll_entry. */
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extern int __dynamically_loaded;
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#undef environ
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extern "C"
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{
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#ifndef __x86_64__
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char **environ;
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#endif
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int _fmode;
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extern char __RUNTIME_PSEUDO_RELOC_LIST__;
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extern char __RUNTIME_PSEUDO_RELOC_LIST_END__;
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#ifdef __x86_64__
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extern char __image_base__;
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#define _image_base__ __image_base__
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#else
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extern char _image_base__;
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#endif
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struct per_process_cxx_malloc __cygwin_cxx_malloc =
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{
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&(operator new), &(operator new[]),
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&(operator delete), &(operator delete[]),
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&(operator new), &(operator new[]),
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&(operator delete), &(operator delete[])
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};
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/* Set up pointers to various pieces so the dll can then use them,
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and then jump to the dll. */
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int __stdcall
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_cygwin_crt0_common (MainFunc f, per_process *u)
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{
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per_process *newu = (per_process *) cygwin_internal (CW_USER_DATA);
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bool uwasnull;
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/* u is non-NULL if we are in a DLL, and NULL in the main exe.
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newu is the Cygwin DLL's internal per_process and never NULL. */
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if (u != NULL)
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uwasnull = false; /* Caller allocated space for per_process structure. */
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else
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{
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u = newu; /* Using DLL built-in per_process. */
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uwasnull = true; /* Remember for later. */
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}
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/* The version numbers are the main source of compatibility checking.
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As a backup to them, we use the size of the per_process struct. */
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u->magic_biscuit = sizeof (per_process);
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/* cygwin.dll version number in effect at the time the app was created. */
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u->dll_major = CYGWIN_VERSION_DLL_MAJOR;
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u->dll_minor = CYGWIN_VERSION_DLL_MINOR;
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u->api_major = CYGWIN_VERSION_API_MAJOR;
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u->api_minor = CYGWIN_VERSION_API_MINOR;
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u->ctors = &__CTOR_LIST__;
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u->dtors = &__DTOR_LIST__;
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#ifndef __x86_64__
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u->envptr = &environ;
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#endif
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if (uwasnull)
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_impure_ptr = u->impure_ptr; /* Use field initialized in newer DLLs. */
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else
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u->impure_ptr_ptr = &_impure_ptr; /* Older DLLs need this. */
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u->main = f;
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/* These functions are executed prior to main. They are just stubs unless the
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user overrides them. */
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u->premain[0] = cygwin_premain0;
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u->premain[1] = cygwin_premain1;
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u->premain[2] = cygwin_premain2;
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u->premain[3] = cygwin_premain3;
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u->fmode_ptr = &_fmode;
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/* This is used to record what the initial sp was. The value is needed
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when copying the parent's stack to the child during a fork. */
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u->initial_sp = (char *) __builtin_frame_address (1);
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/* Remember whatever the user linked his application with - or
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point to entries in the dll. */
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u->malloc = &malloc;
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u->free = &free;
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u->realloc = &realloc;
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u->calloc = &calloc;
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/* Likewise for the C++ memory operators, if any, but not if we
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were dlopen()'d, as we might get dlclose()'d and that would
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leave stale function pointers behind. */
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if (newu && newu->cxx_malloc && !__dynamically_loaded)
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{
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/* Inherit what we don't override. */
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#define CONDITIONALLY_OVERRIDE(MEMBER) \
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if (!__cygwin_cxx_malloc.MEMBER) \
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__cygwin_cxx_malloc.MEMBER = newu->cxx_malloc->MEMBER;
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CONDITIONALLY_OVERRIDE(oper_new);
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CONDITIONALLY_OVERRIDE(oper_new__);
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CONDITIONALLY_OVERRIDE(oper_delete);
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CONDITIONALLY_OVERRIDE(oper_delete__);
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CONDITIONALLY_OVERRIDE(oper_new_nt);
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CONDITIONALLY_OVERRIDE(oper_new___nt);
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CONDITIONALLY_OVERRIDE(oper_delete_nt);
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CONDITIONALLY_OVERRIDE(oper_delete___nt);
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/* Now update the resulting set into the global redirectors. */
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*newu->cxx_malloc = __cygwin_cxx_malloc;
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}
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/* Setup the module handle so fork can get the path name. */
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u->hmodule = GetModuleHandle (0);
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/* variables for fork */
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#ifdef __x86_64__
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u->data_start = &__data_start__;
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u->data_end = &__data_end__;
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u->bss_start = &__bss_start__;
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u->bss_end = &__bss_end__;
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#else
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u->data_start = &_data_start__;
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u->data_end = &_data_end__;
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u->bss_start = &_bss_start__;
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u->bss_end = &_bss_end__;
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#endif
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u->pseudo_reloc_start = &__RUNTIME_PSEUDO_RELOC_LIST__;
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u->pseudo_reloc_end = &__RUNTIME_PSEUDO_RELOC_LIST_END__;
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u->image_base = &_image_base__;
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/* This is actually a dummy call to force the linker to load this
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symbol for older apps which need it. */
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_pei386_runtime_relocator (NULL);
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return 1;
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}
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} /* "C" */
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