764d261276
solution. * miscfuncs.cc (thread_wrapper): Ditto. * sigproc.cc (exit_thread): Disable sending a signal for synchronization with process exit. Explain why. Keep code in for later inspection, should the problem show up again. (sig_send): Use "tls", rather than "tid" as name for _cygtls arg.
104 lines
2.3 KiB
C++
104 lines
2.3 KiB
C++
/* init.cc
|
|
|
|
Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
|
|
2007, 2008, 2009, 2010, 2011, 2012, 2013 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 = (char *) cygthread::stub;
|
|
unsigned threadfunc_ix[8];
|
|
|
|
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:
|
|
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);
|
|
break;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|