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/* init.cc
Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
2006, 2007, 2008, 2009, 2010, 2011 Red Hat, Inc.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include "cygtls.h"
#include "ntdll.h"
#include "shared_info.h"
static DWORD _my_oldfunc;
static char *search_for __attribute__((section (".cygwin_dll_common"), shared)) = (char *) cygthread::stub;
unsigned threadfunc_ix[8] __attribute__((section (".cygwin_dll_common"), shared));
static bool dll_finished_loading;
#define OLDFUNC_OFFSET -1
static void WINAPI
threadfunc_fe (VOID *arg)
{
(void)__builtin_return_address(1);
asm volatile ("andl $-16,%%esp" ::: "%esp");
_cygtls::call ((DWORD (*) (void *, void *)) TlsGetValue (_my_oldfunc), arg);
}
/* If possible, redirect the thread entry point to a cygwin routine which
adds tls stuff to the stack. */
static void
munge_threadfunc ()
{
int i;
char **ebp = (char **) __builtin_frame_address (0);
if (!threadfunc_ix[0])
{
char **peb;
char **top = (char **) _tlsbase;
for (peb = ebp, i = 0; peb < top && i < 7; peb++)
if (*peb == search_for)
threadfunc_ix[i++] = peb - ebp;
if (0 && !threadfunc_ix[0])
{
try_to_debug ();
return;
}
}
if (threadfunc_ix[0])
{
char *threadfunc = ebp[threadfunc_ix[0]];
if (!search_for || threadfunc == search_for)
{
search_for = NULL;
for (i = 0; threadfunc_ix[i]; i++)
ebp[threadfunc_ix[i]] = (char *) threadfunc_fe;
TlsSetValue (_my_oldfunc, threadfunc);
}
}
}
void dll_crt0_0 ();
extern "C" BOOL WINAPI
dll_entry (HANDLE h, DWORD reason, void *static_load)
{
BOOL test_stack_marker;
switch (reason)
{
case DLL_PROCESS_ATTACH:
wincap.init ();
init_console_handler (false);
cygwin_hmodule = (HMODULE) h;
dynamically_loaded = (static_load == NULL);
dll_crt0_0 ();
_my_oldfunc = TlsAlloc ();
dll_finished_loading = true;
break;
case DLL_PROCESS_DETACH:
if (dynamically_loaded)
shared_destroy ();
break;
case DLL_THREAD_ATTACH:
if (dll_finished_loading)
munge_threadfunc ();
break;
case DLL_THREAD_DETACH:
if (dll_finished_loading
&& (PVOID) &_my_tls > (PVOID) &test_stack_marker
&& _my_tls.isinitialized ())
_my_tls.remove (0);
/* Windows 2000 has a bug in NtTerminateThread. Instead of releasing
the stack at teb->DeallocationStack it uses the value of
teb->Tib.StackLimit to evaluate the stack address. So we just claim
there is no stack. */
if (NtCurrentTeb ()->DeallocationStack == NULL
&& !wincap.has_stack_size_param_is_a_reservation ())
NtCurrentTeb ()->Tib.StackLimit = NULL;
break;
}
return TRUE;
}
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