151 lines
5.0 KiB
C++
151 lines
5.0 KiB
C++
/* _cygwin_crt0_common.cc: common crt0 function for cygwin crt0's.
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Copyright 2000, 2001, 2002, 2003, 2004, 2009 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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/* 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__Znwj");
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extern WEAK void *operator new[](std::size_t sz) throw (std::bad_alloc)
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__asm__ ("___real__Znaj");
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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__ZnwjRKSt9nothrow_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__ZnajRKSt9nothrow_t");
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extern WEAK void operator delete(void *p, const std::nothrow_t &nt) throw()
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__asm__ ("___real__ZdlPvRKSt9nothrow_t");
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extern WEAK void operator delete[](void *p, const std::nothrow_t &nt) throw()
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__asm__ ("___real__ZdaPvRKSt9nothrow_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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#undef environ
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extern "C"
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{
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char **environ;
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int cygwin_attach_dll (HMODULE, MainFunc);
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int cygwin_attach_noncygwin_dll (HMODULE, MainFunc);
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int main (int, char **, char **);
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int _fmode;
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void _pei386_runtime_relocator ();
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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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/* 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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per_process *newu = (per_process *) cygwin_internal (CW_USER_DATA);
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int uwasnull;
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if (u != NULL)
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uwasnull = 0; /* 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 = 1; /* 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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u->envptr = &environ;
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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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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. */
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if (newu && newu->cxx_malloc)
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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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}
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/* Now update the resulting set into the global redirectors. */
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if (newu)
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newu->cxx_malloc = &__cygwin_cxx_malloc;
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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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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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_pei386_runtime_relocator ();
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return 1;
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}
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} /* "C" */
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