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Diffstat (limited to 'winsup/cygwin/init.cc')
| -rw-r--r-- | winsup/cygwin/init.cc | 177 |
1 files changed, 0 insertions, 177 deletions
diff --git a/winsup/cygwin/init.cc b/winsup/cygwin/init.cc deleted file mode 100644 index 655d89160..000000000 --- a/winsup/cygwin/init.cc +++ /dev/null @@ -1,177 +0,0 @@ -/* init.cc - - Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 - 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 <stdlib.h> -#include "thread.h" -#include "perprocess.h" -#include "cygtls.h" -#include "pinfo.h" -#include <ntdef.h> -#include "ntdll.h" - -int NO_COPY dynamically_loaded; -static char *search_for = (char *) cygthread::stub; -unsigned threadfunc_ix[8] __attribute__((section (".cygwin_dll_common"), shared)); -DWORD tls_func; - -HANDLE sync_startup; - -#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 *)) (((char **) _tlsbase)[OLDFUNC_OFFSET]), arg); -} - -static DWORD WINAPI -calibration_thread (VOID *arg) -{ - ExitThread (0); -} - -/* We need to know where the OS stores the address of the thread function - on the stack so that we can intercept the call and insert some tls - stuff on the stack. This function starts a known calibration thread. - When it starts, a call will be made to dll_entry which will call munge_threadfunc - looking for the calibration thread offset on the stack. This offset will - be stored and used by all executing cygwin processes. */ -static void -prime_threads () -{ - if (!threadfunc_ix[0]) - { - DWORD id; - search_for = (char *) calibration_thread; - sync_startup = CreateThread (NULL, 0, calibration_thread, 0, 0, &id); - } -} - -/* 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 (!threadfunc_ix[0]) - { - try_to_debug (); - return; - } - } - - char *threadfunc = ebp[threadfunc_ix[0]]; - if (threadfunc == (char *) calibration_thread) - /* no need for the overhead */; - else - { - for (i = 0; threadfunc_ix[i]; i++) - ebp[threadfunc_ix[i]] = (char *) threadfunc_fe; - ((char **) _tlsbase)[OLDFUNC_OFFSET] = threadfunc; - } -} - -inline static void -respawn_wow64_process () -{ - NTSTATUS ret; - PROCESS_BASIC_INFORMATION pbi; - HANDLE parent; - - BOOL is_wow64_proc = TRUE; /* Opt on the safe side. */ - - /* Unfortunately there's no simpler way to retrieve the - parent process in NT, as far as I know. Hints welcome. */ - ret = NtQueryInformationProcess (GetCurrentProcess (), - ProcessBasicInformation, - (PVOID) &pbi, - sizeof pbi, NULL); - if (ret == STATUS_SUCCESS - && (parent = OpenProcess (PROCESS_QUERY_INFORMATION, - FALSE, - pbi.InheritedFromUniqueProcessId))) - { - IsWow64Process (parent, &is_wow64_proc); - CloseHandle (parent); - } - - /* The parent is a real 64 bit process? Respawn! */ - if (!is_wow64_proc) - { - PROCESS_INFORMATION pi; - STARTUPINFO si; - GetStartupInfo (&si); - if (!CreateProcessA (NULL, GetCommandLineA (), NULL, NULL, TRUE, - CREATE_DEFAULT_ERROR_MODE - | GetPriorityClass (GetCurrentProcess ()), - NULL, NULL, &si, &pi)) - api_fatal ("Failed to create process <%s>, %E", GetCommandLineA ()); - CloseHandle (pi.hThread); - if (WaitForSingleObject (pi.hProcess, INFINITE) == WAIT_FAILED) - api_fatal ("Waiting for process %d failed, %E", pi.dwProcessId); - CloseHandle (pi.hProcess); - ExitProcess (0); - } -} - -extern void __stdcall dll_crt0_0 (); - -HMODULE NO_COPY cygwin_hmodule; - -extern "C" BOOL WINAPI -dll_entry (HANDLE h, DWORD reason, void *static_load) -{ - BOOL is_wow64_proc = FALSE; - // _STRACE_ON; - - switch (reason) - { - case DLL_PROCESS_ATTACH: - cygwin_hmodule = (HMODULE) h; - dynamically_loaded = (static_load == NULL); - - /* Is the stack at an unusual address? This is, an address which - is in the usual space occupied by the process image, but below - the auto load address of DLLs? - Check if we're running in WOW64 on a 64 bit machine *and* are - spawned by a genuine 64 bit process. If so, respawn. */ - if (&is_wow64_proc >= (PBOOL) 0x400000 - && &is_wow64_proc <= (PBOOL) 0x10000000 - && IsWow64Process (GetCurrentProcess (), &is_wow64_proc) - && is_wow64_proc) - respawn_wow64_process (); - - prime_threads (); - dll_crt0_0 (); - break; - case DLL_PROCESS_DETACH: - break; - case DLL_THREAD_ATTACH: - munge_threadfunc (); - break; - case DLL_THREAD_DETACH: - _my_tls.remove (0); - break; - } - - return TRUE; -} |