f646aeb049
with the tls. * pinfo.cc (status_exit): Add debug output to report on unexpected exit. * tls_pbuf.cc (tmp_pathbuf::c_get): Add more details to internal error.
160 lines
4.3 KiB
C++
160 lines
4.3 KiB
C++
/* init.cc
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Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
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2006, 2007, 2008, 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 "cygtls.h"
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#include "ntdll.h"
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#include "shared_info.h"
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static DWORD _my_oldfunc;
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static char *search_for __attribute__((section (".cygwin_dll_common"), shared)) = (char *) cygthread::stub;
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unsigned threadfunc_ix[8] __attribute__((section (".cygwin_dll_common"), shared));
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static bool dll_finished_loading;
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#define OLDFUNC_OFFSET -1
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static void WINAPI
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threadfunc_fe (VOID *arg)
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{
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(void)__builtin_return_address(1);
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asm volatile ("andl $-16,%%esp" ::: "%esp");
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_cygtls::call ((DWORD (*) (void *, void *)) TlsGetValue (_my_oldfunc), arg);
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}
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/* If possible, redirect the thread entry point to a cygwin routine which
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adds tls stuff to the stack. */
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static void
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munge_threadfunc ()
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{
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int i;
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char **ebp = (char **) __builtin_frame_address (0);
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if (!threadfunc_ix[0])
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{
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char **peb;
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char **top = (char **) _tlsbase;
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for (peb = ebp, i = 0; peb < top && i < 7; peb++)
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if (*peb == search_for)
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threadfunc_ix[i++] = peb - ebp;
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if (0 && !threadfunc_ix[0])
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{
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try_to_debug ();
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return;
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}
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}
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if (threadfunc_ix[0])
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{
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char *threadfunc = ebp[threadfunc_ix[0]];
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if (!search_for || threadfunc == search_for)
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{
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search_for = NULL;
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for (i = 0; threadfunc_ix[i]; i++)
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ebp[threadfunc_ix[i]] = (char *) threadfunc_fe;
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TlsSetValue (_my_oldfunc, threadfunc);
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}
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}
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}
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inline static void
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respawn_wow64_process ()
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{
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NTSTATUS ret;
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PROCESS_BASIC_INFORMATION pbi;
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HANDLE parent;
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ULONG wow64 = TRUE; /* Opt on the safe side. */
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/* Unfortunately there's no simpler way to retrieve the
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parent process in NT, as far as I know. Hints welcome. */
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ret = NtQueryInformationProcess (NtCurrentProcess (),
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ProcessBasicInformation,
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&pbi, sizeof pbi, NULL);
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if (NT_SUCCESS (ret)
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&& (parent = OpenProcess (PROCESS_QUERY_INFORMATION,
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FALSE,
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pbi.InheritedFromUniqueProcessId)))
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{
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NtQueryInformationProcess (parent, ProcessWow64Information,
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&wow64, sizeof wow64, NULL);
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CloseHandle (parent);
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}
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/* The parent is a real 64 bit process? Respawn! */
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if (!wow64)
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{
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PROCESS_INFORMATION pi;
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STARTUPINFOW si;
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DWORD ret = 0;
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GetStartupInfoW (&si);
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if (!CreateProcessW (NULL, GetCommandLineW (), NULL, NULL, TRUE,
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CREATE_DEFAULT_ERROR_MODE
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| GetPriorityClass (GetCurrentProcess ()),
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NULL, NULL, &si, &pi))
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api_fatal ("Failed to create process <%s>, %E", GetCommandLineA ());
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CloseHandle (pi.hThread);
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if (WaitForSingleObject (pi.hProcess, INFINITE) == WAIT_FAILED)
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api_fatal ("Waiting for process %d failed, %E", pi.dwProcessId);
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GetExitCodeProcess (pi.hProcess, &ret);
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CloseHandle (pi.hProcess);
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ExitProcess (ret);
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}
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}
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extern void __stdcall dll_crt0_0 ();
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extern "C" BOOL WINAPI
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dll_entry (HANDLE h, DWORD reason, void *static_load)
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{
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BOOL wow64_test_stack_marker;
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switch (reason)
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{
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case DLL_PROCESS_ATTACH:
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wincap.init ();
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init_console_handler (false);
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cygwin_hmodule = (HMODULE) h;
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dynamically_loaded = (static_load == NULL);
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/* Is the stack at an unusual address? That is, an address which
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is in the usual space occupied by the process image, but below
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the auto load address of DLLs?
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Check if we're running in WOW64 on a 64 bit machine *and* are
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spawned by a genuine 64 bit process. If so, respawn. */
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if (wincap.is_wow64 ()
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&& &wow64_test_stack_marker >= (PBOOL) 0x400000
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&& &wow64_test_stack_marker <= (PBOOL) 0x10000000)
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respawn_wow64_process ();
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dll_crt0_0 ();
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_my_oldfunc = TlsAlloc ();
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dll_finished_loading = true;
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break;
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case DLL_PROCESS_DETACH:
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if (dynamically_loaded)
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shared_destroy ();
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break;
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case DLL_THREAD_ATTACH:
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if (dll_finished_loading)
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munge_threadfunc ();
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break;
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case DLL_THREAD_DETACH:
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if (dll_finished_loading && (void *) &_my_tls > (void *) &wow64_test_stack_marker
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&& _my_tls.isinitialized ())
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_my_tls.remove (0);
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break;
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}
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return TRUE;
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}
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