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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [gdb/] [gdbserver/] [win32-low.c] - Rev 411
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/* Low level interface to Windows debugging, for gdbserver. Copyright (C) 2006, 2007, 2008 Free Software Foundation, Inc. Contributed by Leo Zayas. Based on "win32-nat.c" from GDB. This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include "server.h" #include "regcache.h" #include "gdb/signals.h" #include "gdb/fileio.h" #include "mem-break.h" #include "win32-low.h" #include <windows.h> #include <winnt.h> #include <imagehlp.h> #include <tlhelp32.h> #include <psapi.h> #include <sys/param.h> #include <malloc.h> #include <process.h> #ifndef USE_WIN32API #include <sys/cygwin.h> #endif #define LOG 0 #define OUTMSG(X) do { printf X; fflush (stdout); } while (0) #if LOG #define OUTMSG2(X) do { printf X; fflush (stdout); } while (0) #else #define OUTMSG2(X) do ; while (0) #endif #ifndef _T #define _T(x) TEXT (x) #endif #ifndef COUNTOF #define COUNTOF(STR) (sizeof (STR) / sizeof ((STR)[0])) #endif #ifdef _WIN32_WCE # define GETPROCADDRESS(DLL, PROC) \ ((winapi_ ## PROC) GetProcAddress (DLL, TEXT (#PROC))) #else # define GETPROCADDRESS(DLL, PROC) \ ((winapi_ ## PROC) GetProcAddress (DLL, #PROC)) #endif int using_threads = 1; /* Globals. */ static int attaching = 0; static HANDLE current_process_handle = NULL; static DWORD current_process_id = 0; static DWORD main_thread_id = 0; static enum target_signal last_sig = TARGET_SIGNAL_0; /* The current debug event from WaitForDebugEvent. */ static DEBUG_EVENT current_event; /* Non zero if an interrupt request is to be satisfied by suspending all threads. */ static int soft_interrupt_requested = 0; /* Non zero if the inferior is stopped in a simulated breakpoint done by suspending all the threads. */ static int faked_breakpoint = 0; #define NUM_REGS (the_low_target.num_regs) typedef BOOL WINAPI (*winapi_DebugActiveProcessStop) (DWORD dwProcessId); typedef BOOL WINAPI (*winapi_DebugSetProcessKillOnExit) (BOOL KillOnExit); typedef BOOL WINAPI (*winapi_DebugBreakProcess) (HANDLE); typedef BOOL WINAPI (*winapi_GenerateConsoleCtrlEvent) (DWORD, DWORD); static void win32_resume (struct thread_resume *resume_info); /* Get the thread ID from the current selected inferior (the current thread). */ static DWORD current_inferior_tid (void) { win32_thread_info *th = inferior_target_data (current_inferior); return th->tid; } /* Get the thread context of the thread associated with TH. */ static void win32_get_thread_context (win32_thread_info *th) { memset (&th->context, 0, sizeof (CONTEXT)); (*the_low_target.get_thread_context) (th, ¤t_event); #ifdef _WIN32_WCE memcpy (&th->base_context, &th->context, sizeof (CONTEXT)); #endif } /* Set the thread context of the thread associated with TH. */ static void win32_set_thread_context (win32_thread_info *th) { #ifdef _WIN32_WCE /* Calling SuspendThread on a thread that is running kernel code will report that the suspending was successful, but in fact, that will often not be true. In those cases, the context returned by GetThreadContext will not be correct by the time the thread stops, hence we can't set that context back into the thread when resuming - it will most likelly crash the inferior. Unfortunately, there is no way to know when the thread will really stop. To work around it, we'll only write the context back to the thread when either the user or GDB explicitly change it between stopping and resuming. */ if (memcmp (&th->context, &th->base_context, sizeof (CONTEXT)) != 0) #endif (*the_low_target.set_thread_context) (th, ¤t_event); } /* Find a thread record given a thread id. If GET_CONTEXT is set then also retrieve the context for this thread. */ static win32_thread_info * thread_rec (DWORD id, int get_context) { struct thread_info *thread; win32_thread_info *th; thread = (struct thread_info *) find_inferior_id (&all_threads, id); if (thread == NULL) return NULL; th = inferior_target_data (thread); if (get_context && th->context.ContextFlags == 0) { if (!th->suspended) { if (SuspendThread (th->h) == (DWORD) -1) { DWORD err = GetLastError (); OUTMSG (("warning: SuspendThread failed in thread_rec, " "(error %d): %s\n", (int) err, strwinerror (err))); } else th->suspended = 1; } win32_get_thread_context (th); } return th; } /* Add a thread to the thread list. */ static win32_thread_info * child_add_thread (DWORD tid, HANDLE h) { win32_thread_info *th; if ((th = thread_rec (tid, FALSE))) return th; th = calloc (1, sizeof (*th)); th->tid = tid; th->h = h; add_thread (tid, th, (unsigned int) tid); set_inferior_regcache_data ((struct thread_info *) find_inferior_id (&all_threads, tid), new_register_cache ()); if (the_low_target.thread_added != NULL) (*the_low_target.thread_added) (th); return th; } /* Delete a thread from the list of threads. */ static void delete_thread_info (struct inferior_list_entry *thread) { win32_thread_info *th = inferior_target_data ((struct thread_info *) thread); remove_thread ((struct thread_info *) thread); CloseHandle (th->h); free (th); } /* Delete a thread from the list of threads. */ static void child_delete_thread (DWORD id) { struct inferior_list_entry *thread; /* If the last thread is exiting, just return. */ if (all_threads.head == all_threads.tail) return; thread = find_inferior_id (&all_threads, id); if (thread == NULL) return; delete_thread_info (thread); } /* Transfer memory from/to the debugged process. */ static int child_xfer_memory (CORE_ADDR memaddr, char *our, int len, int write, struct target_ops *target) { SIZE_T done; long addr = (long) memaddr; if (write) { WriteProcessMemory (current_process_handle, (LPVOID) addr, (LPCVOID) our, len, &done); FlushInstructionCache (current_process_handle, (LPCVOID) addr, len); } else { ReadProcessMemory (current_process_handle, (LPCVOID) addr, (LPVOID) our, len, &done); } return done; } /* Generally, what has the program done? */ enum target_waitkind { /* The program has exited. The exit status is in value.integer. */ TARGET_WAITKIND_EXITED, /* The program has stopped with a signal. Which signal is in value.sig. */ TARGET_WAITKIND_STOPPED, /* The program is letting us know that it dynamically loaded or unloaded something. */ TARGET_WAITKIND_LOADED, /* The program has exec'ed a new executable file. The new file's pathname is pointed to by value.execd_pathname. */ TARGET_WAITKIND_EXECD, /* Nothing interesting happened, but we stopped anyway. We take the chance to check if GDB requested an interrupt. */ TARGET_WAITKIND_SPURIOUS, }; struct target_waitstatus { enum target_waitkind kind; /* Forked child pid, execd pathname, exit status or signal number. */ union { int integer; enum target_signal sig; int related_pid; char *execd_pathname; int syscall_id; } value; }; /* Clear out any old thread list and reinitialize it to a pristine state. */ static void child_init_thread_list (void) { for_each_inferior (&all_threads, delete_thread_info); } static void do_initial_child_stuff (HANDLE proch, DWORD pid) { last_sig = TARGET_SIGNAL_0; current_process_handle = proch; current_process_id = pid; main_thread_id = 0; soft_interrupt_requested = 0; faked_breakpoint = 0; memset (¤t_event, 0, sizeof (current_event)); child_init_thread_list (); if (the_low_target.initial_stuff != NULL) (*the_low_target.initial_stuff) (); } /* Resume all artificially suspended threads if we are continuing execution. */ static int continue_one_thread (struct inferior_list_entry *this_thread, void *id_ptr) { struct thread_info *thread = (struct thread_info *) this_thread; int thread_id = * (int *) id_ptr; win32_thread_info *th = inferior_target_data (thread); if ((thread_id == -1 || thread_id == th->tid) && th->suspended) { if (th->context.ContextFlags) { win32_set_thread_context (th); th->context.ContextFlags = 0; } if (ResumeThread (th->h) == (DWORD) -1) { DWORD err = GetLastError (); OUTMSG (("warning: ResumeThread failed in continue_one_thread, " "(error %d): %s\n", (int) err, strwinerror (err))); } th->suspended = 0; } return 0; } static BOOL child_continue (DWORD continue_status, int thread_id) { /* The inferior will only continue after the ContinueDebugEvent call. */ find_inferior (&all_threads, continue_one_thread, &thread_id); faked_breakpoint = 0; if (!ContinueDebugEvent (current_event.dwProcessId, current_event.dwThreadId, continue_status)) return FALSE; return TRUE; } /* Fetch register(s) from the current thread context. */ static void child_fetch_inferior_registers (int r) { int regno; win32_thread_info *th = thread_rec (current_inferior_tid (), TRUE); if (r == -1 || r == 0 || r > NUM_REGS) child_fetch_inferior_registers (NUM_REGS); else for (regno = 0; regno < r; regno++) (*the_low_target.fetch_inferior_register) (th, regno); } /* Store a new register value into the current thread context. We don't change the program's context until later, when we resume it. */ static void child_store_inferior_registers (int r) { int regno; win32_thread_info *th = thread_rec (current_inferior_tid (), TRUE); if (r == -1 || r == 0 || r > NUM_REGS) child_store_inferior_registers (NUM_REGS); else for (regno = 0; regno < r; regno++) (*the_low_target.store_inferior_register) (th, regno); } /* Map the Windows error number in ERROR to a locale-dependent error message string and return a pointer to it. Typically, the values for ERROR come from GetLastError. The string pointed to shall not be modified by the application, but may be overwritten by a subsequent call to strwinerror The strwinerror function does not change the current setting of GetLastError. */ char * strwinerror (DWORD error) { static char buf[1024]; TCHAR *msgbuf; DWORD lasterr = GetLastError (); DWORD chars = FormatMessage (FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER, NULL, error, 0, /* Default language */ (LPVOID)&msgbuf, 0, NULL); if (chars != 0) { /* If there is an \r\n appended, zap it. */ if (chars >= 2 && msgbuf[chars - 2] == '\r' && msgbuf[chars - 1] == '\n') { chars -= 2; msgbuf[chars] = 0; } if (chars > ((COUNTOF (buf)) - 1)) { chars = COUNTOF (buf) - 1; msgbuf [chars] = 0; } #ifdef UNICODE wcstombs (buf, msgbuf, chars + 1); #else strncpy (buf, msgbuf, chars + 1); #endif LocalFree (msgbuf); } else sprintf (buf, "unknown win32 error (%ld)", error); SetLastError (lasterr); return buf; } static BOOL create_process (const char *program, char *args, DWORD flags, PROCESS_INFORMATION *pi) { BOOL ret; #ifdef _WIN32_WCE wchar_t *p, *wprogram, *wargs; size_t argslen; wprogram = alloca ((strlen (program) + 1) * sizeof (wchar_t)); mbstowcs (wprogram, program, strlen (program) + 1); for (p = wprogram; *p; ++p) if (L'/' == *p) *p = L'\\'; argslen = strlen (args); wargs = alloca ((argslen + 1) * sizeof (wchar_t)); mbstowcs (wargs, args, argslen + 1); ret = CreateProcessW (wprogram, /* image name */ wargs, /* command line */ NULL, /* security, not supported */ NULL, /* thread, not supported */ FALSE, /* inherit handles, not supported */ flags, /* start flags */ NULL, /* environment, not supported */ NULL, /* current directory, not supported */ NULL, /* start info, not supported */ pi); /* proc info */ #else STARTUPINFOA si = { sizeof (STARTUPINFOA) }; ret = CreateProcessA (program, /* image name */ args, /* command line */ NULL, /* security */ NULL, /* thread */ TRUE, /* inherit handles */ flags, /* start flags */ NULL, /* environment */ NULL, /* current directory */ &si, /* start info */ pi); /* proc info */ #endif return ret; } /* Start a new process. PROGRAM is a path to the program to execute. ARGS is a standard NULL-terminated array of arguments, to be passed to the inferior as ``argv''. Returns the new PID on success, -1 on failure. Registers the new process with the process list. */ static int win32_create_inferior (char *program, char **program_args) { #ifndef USE_WIN32API char real_path[MAXPATHLEN]; char *orig_path, *new_path, *path_ptr; #endif BOOL ret; DWORD flags; char *args; int argslen; int argc; PROCESS_INFORMATION pi; DWORD err; /* win32_wait needs to know we're not attaching. */ attaching = 0; if (!program) error ("No executable specified, specify executable to debug.\n"); flags = DEBUG_PROCESS | DEBUG_ONLY_THIS_PROCESS; #ifndef USE_WIN32API orig_path = NULL; path_ptr = getenv ("PATH"); if (path_ptr) { orig_path = alloca (strlen (path_ptr) + 1); new_path = alloca (cygwin_posix_to_win32_path_list_buf_size (path_ptr)); strcpy (orig_path, path_ptr); cygwin_posix_to_win32_path_list (path_ptr, new_path); setenv ("PATH", new_path, 1); } cygwin_conv_to_win32_path (program, real_path); program = real_path; #endif argslen = 1; for (argc = 1; program_args[argc]; argc++) argslen += strlen (program_args[argc]) + 1; args = alloca (argslen); args[0] = '\0'; for (argc = 1; program_args[argc]; argc++) { /* FIXME: Can we do better about quoting? How does Cygwin handle this? */ strcat (args, " "); strcat (args, program_args[argc]); } OUTMSG2 (("Command line is \"%s\"\n", args)); #ifdef CREATE_NEW_PROCESS_GROUP flags |= CREATE_NEW_PROCESS_GROUP; #endif ret = create_process (program, args, flags, &pi); err = GetLastError (); if (!ret && err == ERROR_FILE_NOT_FOUND) { char *exename = alloca (strlen (program) + 5); strcat (strcpy (exename, program), ".exe"); ret = create_process (exename, args, flags, &pi); err = GetLastError (); } #ifndef USE_WIN32API if (orig_path) setenv ("PATH", orig_path, 1); #endif if (!ret) { error ("Error creating process \"%s%s\", (error %d): %s\n", program, args, (int) err, strwinerror (err)); } else { OUTMSG2 (("Process created: %s\n", (char *) args)); } #ifndef _WIN32_WCE /* On Windows CE this handle can't be closed. The OS reuses it in the debug events, while the 9x/NT versions of Windows probably use a DuplicateHandle'd one. */ CloseHandle (pi.hThread); #endif do_initial_child_stuff (pi.hProcess, pi.dwProcessId); return current_process_id; } /* Attach to a running process. PID is the process ID to attach to, specified by the user or a higher layer. */ static int win32_attach (unsigned long pid) { HANDLE h; winapi_DebugSetProcessKillOnExit DebugSetProcessKillOnExit = NULL; DWORD err; #ifdef _WIN32_WCE HMODULE dll = GetModuleHandle (_T("COREDLL.DLL")); #else HMODULE dll = GetModuleHandle (_T("KERNEL32.DLL")); #endif DebugSetProcessKillOnExit = GETPROCADDRESS (dll, DebugSetProcessKillOnExit); h = OpenProcess (PROCESS_ALL_ACCESS, FALSE, pid); if (h != NULL) { if (DebugActiveProcess (pid)) { if (DebugSetProcessKillOnExit != NULL) DebugSetProcessKillOnExit (FALSE); /* win32_wait needs to know we're attaching. */ attaching = 1; do_initial_child_stuff (h, pid); return 0; } CloseHandle (h); } err = GetLastError (); error ("Attach to process failed (error %d): %s\n", (int) err, strwinerror (err)); } /* Handle OUTPUT_DEBUG_STRING_EVENT from child process. */ static void handle_output_debug_string (struct target_waitstatus *ourstatus) { #define READ_BUFFER_LEN 1024 CORE_ADDR addr; char s[READ_BUFFER_LEN + 1] = { 0 }; DWORD nbytes = current_event.u.DebugString.nDebugStringLength; if (nbytes == 0) return; if (nbytes > READ_BUFFER_LEN) nbytes = READ_BUFFER_LEN; addr = (CORE_ADDR) (size_t) current_event.u.DebugString.lpDebugStringData; if (current_event.u.DebugString.fUnicode) { /* The event tells us how many bytes, not chars, even in Unicode. */ WCHAR buffer[(READ_BUFFER_LEN + 1) / sizeof (WCHAR)] = { 0 }; if (read_inferior_memory (addr, (unsigned char *) buffer, nbytes) != 0) return; wcstombs (s, buffer, (nbytes + 1) / sizeof (WCHAR)); } else { if (read_inferior_memory (addr, (unsigned char *) s, nbytes) != 0) return; } if (strncmp (s, "cYg", 3) != 0) { if (!server_waiting) { OUTMSG2(("%s", s)); return; } monitor_output (s); } #undef READ_BUFFER_LEN } static void win32_clear_inferiors (void) { if (current_process_handle != NULL) CloseHandle (current_process_handle); for_each_inferior (&all_threads, delete_thread_info); clear_inferiors (); } /* Kill all inferiors. */ static void win32_kill (void) { if (current_process_handle == NULL) return; TerminateProcess (current_process_handle, 0); for (;;) { if (!child_continue (DBG_CONTINUE, -1)) break; if (!WaitForDebugEvent (¤t_event, INFINITE)) break; if (current_event.dwDebugEventCode == EXIT_PROCESS_DEBUG_EVENT) break; else if (current_event.dwDebugEventCode == OUTPUT_DEBUG_STRING_EVENT) { struct target_waitstatus our_status = { 0 }; handle_output_debug_string (&our_status); } } win32_clear_inferiors (); } /* Detach from all inferiors. */ static int win32_detach (void) { winapi_DebugActiveProcessStop DebugActiveProcessStop = NULL; winapi_DebugSetProcessKillOnExit DebugSetProcessKillOnExit = NULL; #ifdef _WIN32_WCE HMODULE dll = GetModuleHandle (_T("COREDLL.DLL")); #else HMODULE dll = GetModuleHandle (_T("KERNEL32.DLL")); #endif DebugActiveProcessStop = GETPROCADDRESS (dll, DebugActiveProcessStop); DebugSetProcessKillOnExit = GETPROCADDRESS (dll, DebugSetProcessKillOnExit); if (DebugSetProcessKillOnExit == NULL || DebugActiveProcessStop == NULL) return -1; { struct thread_resume resume; resume.thread = -1; resume.step = 0; resume.sig = 0; resume.leave_stopped = 0; win32_resume (&resume); } if (!DebugActiveProcessStop (current_process_id)) return -1; DebugSetProcessKillOnExit (FALSE); win32_clear_inferiors (); return 0; } /* Wait for inferiors to end. */ static void win32_join (void) { extern unsigned long signal_pid; HANDLE h = OpenProcess (PROCESS_ALL_ACCESS, FALSE, signal_pid); if (h != NULL) { WaitForSingleObject (h, INFINITE); CloseHandle (h); } } /* Return 1 iff the thread with thread ID TID is alive. */ static int win32_thread_alive (unsigned long tid) { int res; /* Our thread list is reliable; don't bother to poll target threads. */ if (find_inferior_id (&all_threads, tid) != NULL) res = 1; else res = 0; return res; } /* Resume the inferior process. RESUME_INFO describes how we want to resume. */ static void win32_resume (struct thread_resume *resume_info) { DWORD tid; enum target_signal sig; int step; win32_thread_info *th; DWORD continue_status = DBG_CONTINUE; /* This handles the very limited set of resume packets that GDB can currently produce. */ if (resume_info[0].thread == -1) tid = -1; else if (resume_info[1].thread == -1 && !resume_info[1].leave_stopped) tid = -1; else /* Yes, we're ignoring resume_info[0].thread. It'd be tricky to make the Windows resume code do the right thing for thread switching. */ tid = current_event.dwThreadId; if (resume_info[0].thread != -1) { sig = resume_info[0].sig; step = resume_info[0].step; } else { sig = 0; step = 0; } if (sig != TARGET_SIGNAL_0) { if (current_event.dwDebugEventCode != EXCEPTION_DEBUG_EVENT) { OUTMSG (("Cannot continue with signal %d here.\n", sig)); } else if (sig == last_sig) continue_status = DBG_EXCEPTION_NOT_HANDLED; else OUTMSG (("Can only continue with recieved signal %d.\n", last_sig)); } last_sig = TARGET_SIGNAL_0; /* Get context for the currently selected thread. */ th = thread_rec (current_event.dwThreadId, FALSE); if (th) { if (th->context.ContextFlags) { /* Move register values from the inferior into the thread context structure. */ regcache_invalidate (); if (step) { if (the_low_target.single_step != NULL) (*the_low_target.single_step) (th); else error ("Single stepping is not supported " "in this configuration.\n"); } win32_set_thread_context (th); th->context.ContextFlags = 0; } } /* Allow continuing with the same signal that interrupted us. Otherwise complain. */ child_continue (continue_status, tid); } static void win32_add_one_solib (const char *name, CORE_ADDR load_addr) { char buf[MAX_PATH + 1]; char buf2[MAX_PATH + 1]; #ifdef _WIN32_WCE WIN32_FIND_DATA w32_fd; WCHAR wname[MAX_PATH + 1]; mbstowcs (wname, name, MAX_PATH); HANDLE h = FindFirstFile (wname, &w32_fd); #else WIN32_FIND_DATAA w32_fd; HANDLE h = FindFirstFileA (name, &w32_fd); #endif if (h == INVALID_HANDLE_VALUE) strcpy (buf, name); else { FindClose (h); strcpy (buf, name); #ifndef _WIN32_WCE { char cwd[MAX_PATH + 1]; char *p; if (GetCurrentDirectoryA (MAX_PATH + 1, cwd)) { p = strrchr (buf, '\\'); if (p) p[1] = '\0'; SetCurrentDirectoryA (buf); GetFullPathNameA (w32_fd.cFileName, MAX_PATH, buf, &p); SetCurrentDirectoryA (cwd); } } #endif } #ifdef __CYGWIN__ cygwin_conv_to_posix_path (buf, buf2); #else strcpy (buf2, buf); #endif loaded_dll (buf2, load_addr); } static char * get_image_name (HANDLE h, void *address, int unicode) { static char buf[(2 * MAX_PATH) + 1]; DWORD size = unicode ? sizeof (WCHAR) : sizeof (char); char *address_ptr; int len = 0; char b[2]; DWORD done; /* Attempt to read the name of the dll that was detected. This is documented to work only when actively debugging a program. It will not work for attached processes. */ if (address == NULL) return NULL; #ifdef _WIN32_WCE /* Windows CE reports the address of the image name, instead of an address of a pointer into the image name. */ address_ptr = address; #else /* See if we could read the address of a string, and that the address isn't null. */ if (!ReadProcessMemory (h, address, &address_ptr, sizeof (address_ptr), &done) || done != sizeof (address_ptr) || !address_ptr) return NULL; #endif /* Find the length of the string */ while (ReadProcessMemory (h, address_ptr + len++ * size, &b, size, &done) && (b[0] != 0 || b[size - 1] != 0) && done == size) continue; if (!unicode) ReadProcessMemory (h, address_ptr, buf, len, &done); else { WCHAR *unicode_address = (WCHAR *) alloca (len * sizeof (WCHAR)); ReadProcessMemory (h, address_ptr, unicode_address, len * sizeof (WCHAR), &done); WideCharToMultiByte (CP_ACP, 0, unicode_address, len, buf, len, 0, 0); } return buf; } typedef BOOL (WINAPI *winapi_EnumProcessModules) (HANDLE, HMODULE *, DWORD, LPDWORD); typedef BOOL (WINAPI *winapi_GetModuleInformation) (HANDLE, HMODULE, LPMODULEINFO, DWORD); typedef DWORD (WINAPI *winapi_GetModuleFileNameExA) (HANDLE, HMODULE, LPSTR, DWORD); static winapi_EnumProcessModules win32_EnumProcessModules; static winapi_GetModuleInformation win32_GetModuleInformation; static winapi_GetModuleFileNameExA win32_GetModuleFileNameExA; static BOOL load_psapi (void) { static int psapi_loaded = 0; static HMODULE dll = NULL; if (!psapi_loaded) { psapi_loaded = 1; dll = LoadLibrary (TEXT("psapi.dll")); if (!dll) return FALSE; win32_EnumProcessModules = GETPROCADDRESS (dll, EnumProcessModules); win32_GetModuleInformation = GETPROCADDRESS (dll, GetModuleInformation); win32_GetModuleFileNameExA = GETPROCADDRESS (dll, GetModuleFileNameExA); } return (win32_EnumProcessModules != NULL && win32_GetModuleInformation != NULL && win32_GetModuleFileNameExA != NULL); } static int psapi_get_dll_name (DWORD BaseAddress, char *dll_name_ret) { DWORD len; MODULEINFO mi; size_t i; HMODULE dh_buf[1]; HMODULE *DllHandle = dh_buf; DWORD cbNeeded; BOOL ok; if (!load_psapi ()) goto failed; cbNeeded = 0; ok = (*win32_EnumProcessModules) (current_process_handle, DllHandle, sizeof (HMODULE), &cbNeeded); if (!ok || !cbNeeded) goto failed; DllHandle = (HMODULE *) alloca (cbNeeded); if (!DllHandle) goto failed; ok = (*win32_EnumProcessModules) (current_process_handle, DllHandle, cbNeeded, &cbNeeded); if (!ok) goto failed; for (i = 0; i < ((size_t) cbNeeded / sizeof (HMODULE)); i++) { if (!(*win32_GetModuleInformation) (current_process_handle, DllHandle[i], &mi, sizeof (mi))) { DWORD err = GetLastError (); error ("Can't get module info: (error %d): %s\n", (int) err, strwinerror (err)); } if ((DWORD) (mi.lpBaseOfDll) == BaseAddress) { len = (*win32_GetModuleFileNameExA) (current_process_handle, DllHandle[i], dll_name_ret, MAX_PATH); if (len == 0) { DWORD err = GetLastError (); error ("Error getting dll name: (error %d): %s\n", (int) err, strwinerror (err)); } return 1; } } failed: dll_name_ret[0] = '\0'; return 0; } typedef HANDLE (WINAPI *winapi_CreateToolhelp32Snapshot) (DWORD, DWORD); typedef BOOL (WINAPI *winapi_Module32First) (HANDLE, LPMODULEENTRY32); typedef BOOL (WINAPI *winapi_Module32Next) (HANDLE, LPMODULEENTRY32); static winapi_CreateToolhelp32Snapshot win32_CreateToolhelp32Snapshot; static winapi_Module32First win32_Module32First; static winapi_Module32Next win32_Module32Next; #ifdef _WIN32_WCE typedef BOOL (WINAPI *winapi_CloseToolhelp32Snapshot) (HANDLE); static winapi_CloseToolhelp32Snapshot win32_CloseToolhelp32Snapshot; #endif static BOOL load_toolhelp (void) { static int toolhelp_loaded = 0; static HMODULE dll = NULL; if (!toolhelp_loaded) { toolhelp_loaded = 1; #ifndef _WIN32_WCE dll = GetModuleHandle (_T("KERNEL32.DLL")); #else dll = LoadLibrary (L"TOOLHELP.DLL"); #endif if (!dll) return FALSE; win32_CreateToolhelp32Snapshot = GETPROCADDRESS (dll, CreateToolhelp32Snapshot); win32_Module32First = GETPROCADDRESS (dll, Module32First); win32_Module32Next = GETPROCADDRESS (dll, Module32Next); #ifdef _WIN32_WCE win32_CloseToolhelp32Snapshot = GETPROCADDRESS (dll, CloseToolhelp32Snapshot); #endif } return (win32_CreateToolhelp32Snapshot != NULL && win32_Module32First != NULL && win32_Module32Next != NULL #ifdef _WIN32_WCE && win32_CloseToolhelp32Snapshot != NULL #endif ); } static int toolhelp_get_dll_name (DWORD BaseAddress, char *dll_name_ret) { HANDLE snapshot_module; MODULEENTRY32 modEntry = { sizeof (MODULEENTRY32) }; int found = 0; if (!load_toolhelp ()) return 0; snapshot_module = win32_CreateToolhelp32Snapshot (TH32CS_SNAPMODULE, current_event.dwProcessId); if (snapshot_module == INVALID_HANDLE_VALUE) return 0; /* Ignore the first module, which is the exe. */ if (win32_Module32First (snapshot_module, &modEntry)) while (win32_Module32Next (snapshot_module, &modEntry)) if ((DWORD) modEntry.modBaseAddr == BaseAddress) { #ifdef UNICODE wcstombs (dll_name_ret, modEntry.szExePath, MAX_PATH + 1); #else strcpy (dll_name_ret, modEntry.szExePath); #endif found = 1; break; } #ifdef _WIN32_WCE win32_CloseToolhelp32Snapshot (snapshot_module); #else CloseHandle (snapshot_module); #endif return found; } static void handle_load_dll (void) { LOAD_DLL_DEBUG_INFO *event = ¤t_event.u.LoadDll; char dll_buf[MAX_PATH + 1]; char *dll_name = NULL; DWORD load_addr; dll_buf[0] = dll_buf[sizeof (dll_buf) - 1] = '\0'; /* Windows does not report the image name of the dlls in the debug event on attaches. We resort to iterating over the list of loaded dlls looking for a match by image base. */ if (!psapi_get_dll_name ((DWORD) event->lpBaseOfDll, dll_buf)) { if (!server_waiting) /* On some versions of Windows and Windows CE, we can't create toolhelp snapshots while the inferior is stopped in a LOAD_DLL_DEBUG_EVENT due to a dll load, but we can while Windows is reporting the already loaded dlls. */ toolhelp_get_dll_name ((DWORD) event->lpBaseOfDll, dll_buf); } dll_name = dll_buf; if (*dll_name == '\0') dll_name = get_image_name (current_process_handle, event->lpImageName, event->fUnicode); if (!dll_name) return; /* The symbols in a dll are offset by 0x1000, which is the the offset from 0 of the first byte in an image - because of the file header and the section alignment. */ load_addr = (DWORD) event->lpBaseOfDll + 0x1000; win32_add_one_solib (dll_name, load_addr); } static void handle_unload_dll (void) { CORE_ADDR load_addr = (CORE_ADDR) (DWORD) current_event.u.UnloadDll.lpBaseOfDll; load_addr += 0x1000; unloaded_dll (NULL, load_addr); } static void handle_exception (struct target_waitstatus *ourstatus) { DWORD code = current_event.u.Exception.ExceptionRecord.ExceptionCode; ourstatus->kind = TARGET_WAITKIND_STOPPED; switch (code) { case EXCEPTION_ACCESS_VIOLATION: OUTMSG2 (("EXCEPTION_ACCESS_VIOLATION")); ourstatus->value.sig = TARGET_SIGNAL_SEGV; break; case STATUS_STACK_OVERFLOW: OUTMSG2 (("STATUS_STACK_OVERFLOW")); ourstatus->value.sig = TARGET_SIGNAL_SEGV; break; case STATUS_FLOAT_DENORMAL_OPERAND: OUTMSG2 (("STATUS_FLOAT_DENORMAL_OPERAND")); ourstatus->value.sig = TARGET_SIGNAL_FPE; break; case EXCEPTION_ARRAY_BOUNDS_EXCEEDED: OUTMSG2 (("EXCEPTION_ARRAY_BOUNDS_EXCEEDED")); ourstatus->value.sig = TARGET_SIGNAL_FPE; break; case STATUS_FLOAT_INEXACT_RESULT: OUTMSG2 (("STATUS_FLOAT_INEXACT_RESULT")); ourstatus->value.sig = TARGET_SIGNAL_FPE; break; case STATUS_FLOAT_INVALID_OPERATION: OUTMSG2 (("STATUS_FLOAT_INVALID_OPERATION")); ourstatus->value.sig = TARGET_SIGNAL_FPE; break; case STATUS_FLOAT_OVERFLOW: OUTMSG2 (("STATUS_FLOAT_OVERFLOW")); ourstatus->value.sig = TARGET_SIGNAL_FPE; break; case STATUS_FLOAT_STACK_CHECK: OUTMSG2 (("STATUS_FLOAT_STACK_CHECK")); ourstatus->value.sig = TARGET_SIGNAL_FPE; break; case STATUS_FLOAT_UNDERFLOW: OUTMSG2 (("STATUS_FLOAT_UNDERFLOW")); ourstatus->value.sig = TARGET_SIGNAL_FPE; break; case STATUS_FLOAT_DIVIDE_BY_ZERO: OUTMSG2 (("STATUS_FLOAT_DIVIDE_BY_ZERO")); ourstatus->value.sig = TARGET_SIGNAL_FPE; break; case STATUS_INTEGER_DIVIDE_BY_ZERO: OUTMSG2 (("STATUS_INTEGER_DIVIDE_BY_ZERO")); ourstatus->value.sig = TARGET_SIGNAL_FPE; break; case STATUS_INTEGER_OVERFLOW: OUTMSG2 (("STATUS_INTEGER_OVERFLOW")); ourstatus->value.sig = TARGET_SIGNAL_FPE; break; case EXCEPTION_BREAKPOINT: OUTMSG2 (("EXCEPTION_BREAKPOINT")); ourstatus->value.sig = TARGET_SIGNAL_TRAP; #ifdef _WIN32_WCE /* Remove the initial breakpoint. */ check_breakpoints ((CORE_ADDR) (long) current_event .u.Exception.ExceptionRecord.ExceptionAddress); #endif break; case DBG_CONTROL_C: OUTMSG2 (("DBG_CONTROL_C")); ourstatus->value.sig = TARGET_SIGNAL_INT; break; case DBG_CONTROL_BREAK: OUTMSG2 (("DBG_CONTROL_BREAK")); ourstatus->value.sig = TARGET_SIGNAL_INT; break; case EXCEPTION_SINGLE_STEP: OUTMSG2 (("EXCEPTION_SINGLE_STEP")); ourstatus->value.sig = TARGET_SIGNAL_TRAP; break; case EXCEPTION_ILLEGAL_INSTRUCTION: OUTMSG2 (("EXCEPTION_ILLEGAL_INSTRUCTION")); ourstatus->value.sig = TARGET_SIGNAL_ILL; break; case EXCEPTION_PRIV_INSTRUCTION: OUTMSG2 (("EXCEPTION_PRIV_INSTRUCTION")); ourstatus->value.sig = TARGET_SIGNAL_ILL; break; case EXCEPTION_NONCONTINUABLE_EXCEPTION: OUTMSG2 (("EXCEPTION_NONCONTINUABLE_EXCEPTION")); ourstatus->value.sig = TARGET_SIGNAL_ILL; break; default: if (current_event.u.Exception.dwFirstChance) { ourstatus->kind = TARGET_WAITKIND_SPURIOUS; return; } OUTMSG2 (("gdbserver: unknown target exception 0x%08lx at 0x%08lx", current_event.u.Exception.ExceptionRecord.ExceptionCode, (DWORD) current_event.u.Exception.ExceptionRecord. ExceptionAddress)); ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN; break; } OUTMSG2 (("\n")); last_sig = ourstatus->value.sig; } static void suspend_one_thread (struct inferior_list_entry *entry) { struct thread_info *thread = (struct thread_info *) entry; win32_thread_info *th = inferior_target_data (thread); if (!th->suspended) { if (SuspendThread (th->h) == (DWORD) -1) { DWORD err = GetLastError (); OUTMSG (("warning: SuspendThread failed in suspend_one_thread, " "(error %d): %s\n", (int) err, strwinerror (err))); } else th->suspended = 1; } } static void fake_breakpoint_event (void) { OUTMSG2(("fake_breakpoint_event\n")); faked_breakpoint = 1; memset (¤t_event, 0, sizeof (current_event)); current_event.dwThreadId = main_thread_id; current_event.dwDebugEventCode = EXCEPTION_DEBUG_EVENT; current_event.u.Exception.ExceptionRecord.ExceptionCode = EXCEPTION_BREAKPOINT; for_each_inferior (&all_threads, suspend_one_thread); } #ifdef _WIN32_WCE static int auto_delete_breakpoint (CORE_ADDR stop_pc) { return 1; } #endif /* Get the next event from the child. */ static int get_child_debug_event (struct target_waitstatus *ourstatus) { last_sig = TARGET_SIGNAL_0; ourstatus->kind = TARGET_WAITKIND_SPURIOUS; /* Check if GDB sent us an interrupt request. */ check_remote_input_interrupt_request (); if (soft_interrupt_requested) { soft_interrupt_requested = 0; fake_breakpoint_event (); goto gotevent; } #ifndef _WIN32_WCE attaching = 0; #else if (attaching) { /* WinCE doesn't set an initial breakpoint automatically. To stop the inferior, we flush all currently pending debug events -- the thread list and the dll list are always reported immediatelly without delay, then, we suspend all threads and pretend we saw a trap at the current PC of the main thread. Contrary to desktop Windows, Windows CE *does* report the dll names on LOAD_DLL_DEBUG_EVENTs resulting from a DebugActiveProcess call. This limits the way we can detect if all the dlls have already been reported. If we get a real debug event before leaving attaching, the worst that will happen is the user will see a spurious breakpoint. */ current_event.dwDebugEventCode = 0; if (!WaitForDebugEvent (¤t_event, 0)) { OUTMSG2(("no attach events left\n")); fake_breakpoint_event (); attaching = 0; } else OUTMSG2(("got attach event\n")); } else #endif { /* Keep the wait time low enough for confortable remote interruption, but high enough so gdbserver doesn't become a bottleneck. */ if (!WaitForDebugEvent (¤t_event, 250)) return 0; } gotevent: current_inferior = (struct thread_info *) find_inferior_id (&all_threads, current_event.dwThreadId); switch (current_event.dwDebugEventCode) { case CREATE_THREAD_DEBUG_EVENT: OUTMSG2 (("gdbserver: kernel event CREATE_THREAD_DEBUG_EVENT " "for pid=%d tid=%x)\n", (unsigned) current_event.dwProcessId, (unsigned) current_event.dwThreadId)); /* Record the existence of this thread. */ child_add_thread (current_event.dwThreadId, current_event.u.CreateThread.hThread); break; case EXIT_THREAD_DEBUG_EVENT: OUTMSG2 (("gdbserver: kernel event EXIT_THREAD_DEBUG_EVENT " "for pid=%d tid=%x\n", (unsigned) current_event.dwProcessId, (unsigned) current_event.dwThreadId)); child_delete_thread (current_event.dwThreadId); break; case CREATE_PROCESS_DEBUG_EVENT: OUTMSG2 (("gdbserver: kernel event CREATE_PROCESS_DEBUG_EVENT " "for pid=%d tid=%x\n", (unsigned) current_event.dwProcessId, (unsigned) current_event.dwThreadId)); CloseHandle (current_event.u.CreateProcessInfo.hFile); current_process_handle = current_event.u.CreateProcessInfo.hProcess; main_thread_id = current_event.dwThreadId; ourstatus->kind = TARGET_WAITKIND_EXECD; ourstatus->value.execd_pathname = "Main executable"; /* Add the main thread. */ child_add_thread (main_thread_id, current_event.u.CreateProcessInfo.hThread); ourstatus->value.related_pid = current_event.dwThreadId; #ifdef _WIN32_WCE if (!attaching) { /* Windows CE doesn't set the initial breakpoint automatically like the desktop versions of Windows do. We add it explicitly here. It will be removed as soon as it is hit. */ set_breakpoint_at ((CORE_ADDR) (long) current_event.u .CreateProcessInfo.lpStartAddress, auto_delete_breakpoint); } #endif break; case EXIT_PROCESS_DEBUG_EVENT: OUTMSG2 (("gdbserver: kernel event EXIT_PROCESS_DEBUG_EVENT " "for pid=%d tid=%x\n", (unsigned) current_event.dwProcessId, (unsigned) current_event.dwThreadId)); ourstatus->kind = TARGET_WAITKIND_EXITED; ourstatus->value.integer = current_event.u.ExitProcess.dwExitCode; CloseHandle (current_process_handle); current_process_handle = NULL; break; case LOAD_DLL_DEBUG_EVENT: OUTMSG2 (("gdbserver: kernel event LOAD_DLL_DEBUG_EVENT " "for pid=%d tid=%x\n", (unsigned) current_event.dwProcessId, (unsigned) current_event.dwThreadId)); CloseHandle (current_event.u.LoadDll.hFile); handle_load_dll (); ourstatus->kind = TARGET_WAITKIND_LOADED; ourstatus->value.sig = TARGET_SIGNAL_TRAP; break; case UNLOAD_DLL_DEBUG_EVENT: OUTMSG2 (("gdbserver: kernel event UNLOAD_DLL_DEBUG_EVENT " "for pid=%d tid=%x\n", (unsigned) current_event.dwProcessId, (unsigned) current_event.dwThreadId)); handle_unload_dll (); ourstatus->kind = TARGET_WAITKIND_LOADED; ourstatus->value.sig = TARGET_SIGNAL_TRAP; break; case EXCEPTION_DEBUG_EVENT: OUTMSG2 (("gdbserver: kernel event EXCEPTION_DEBUG_EVENT " "for pid=%d tid=%x\n", (unsigned) current_event.dwProcessId, (unsigned) current_event.dwThreadId)); handle_exception (ourstatus); break; case OUTPUT_DEBUG_STRING_EVENT: /* A message from the kernel (or Cygwin). */ OUTMSG2 (("gdbserver: kernel event OUTPUT_DEBUG_STRING_EVENT " "for pid=%d tid=%x\n", (unsigned) current_event.dwProcessId, (unsigned) current_event.dwThreadId)); handle_output_debug_string (ourstatus); break; default: OUTMSG2 (("gdbserver: kernel event unknown " "for pid=%d tid=%x code=%ld\n", (unsigned) current_event.dwProcessId, (unsigned) current_event.dwThreadId, current_event.dwDebugEventCode)); break; } current_inferior = (struct thread_info *) find_inferior_id (&all_threads, current_event.dwThreadId); return 1; } /* Wait for the inferior process to change state. STATUS will be filled in with a response code to send to GDB. Returns the signal which caused the process to stop. */ static unsigned char win32_wait (char *status) { struct target_waitstatus our_status; *status = 'T'; while (1) { if (!get_child_debug_event (&our_status)) continue; switch (our_status.kind) { case TARGET_WAITKIND_EXITED: OUTMSG2 (("Child exited with retcode = %x\n", our_status.value.integer)); *status = 'W'; win32_clear_inferiors (); return our_status.value.integer; case TARGET_WAITKIND_STOPPED: case TARGET_WAITKIND_LOADED: OUTMSG2 (("Child Stopped with signal = %d \n", our_status.value.sig)); *status = 'T'; child_fetch_inferior_registers (-1); if (our_status.kind == TARGET_WAITKIND_LOADED && !server_waiting) { /* When gdb connects, we want to be stopped at the initial breakpoint, not in some dll load event. */ child_continue (DBG_CONTINUE, -1); break; } return our_status.value.sig; default: OUTMSG (("Ignoring unknown internal event, %d\n", our_status.kind)); /* fall-through */ case TARGET_WAITKIND_SPURIOUS: case TARGET_WAITKIND_EXECD: /* do nothing, just continue */ child_continue (DBG_CONTINUE, -1); break; } } } /* Fetch registers from the inferior process. If REGNO is -1, fetch all registers; otherwise, fetch at least REGNO. */ static void win32_fetch_inferior_registers (int regno) { child_fetch_inferior_registers (regno); } /* Store registers to the inferior process. If REGNO is -1, store all registers; otherwise, store at least REGNO. */ static void win32_store_inferior_registers (int regno) { child_store_inferior_registers (regno); } /* Read memory from the inferior process. This should generally be called through read_inferior_memory, which handles breakpoint shadowing. Read LEN bytes at MEMADDR into a buffer at MYADDR. */ static int win32_read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) { return child_xfer_memory (memaddr, (char *) myaddr, len, 0, 0) != len; } /* Write memory to the inferior process. This should generally be called through write_inferior_memory, which handles breakpoint shadowing. Write LEN bytes from the buffer at MYADDR to MEMADDR. Returns 0 on success and errno on failure. */ static int win32_write_inferior_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) { return child_xfer_memory (memaddr, (char *) myaddr, len, 1, 0) != len; } /* Send an interrupt request to the inferior process. */ static void win32_request_interrupt (void) { winapi_DebugBreakProcess DebugBreakProcess; winapi_GenerateConsoleCtrlEvent GenerateConsoleCtrlEvent; #ifdef _WIN32_WCE HMODULE dll = GetModuleHandle (_T("COREDLL.DLL")); #else HMODULE dll = GetModuleHandle (_T("KERNEL32.DLL")); #endif GenerateConsoleCtrlEvent = GETPROCADDRESS (dll, GenerateConsoleCtrlEvent); if (GenerateConsoleCtrlEvent != NULL && GenerateConsoleCtrlEvent (CTRL_BREAK_EVENT, current_process_id)) return; /* GenerateConsoleCtrlEvent can fail if process id being debugged is not a process group id. Fallback to XP/Vista 'DebugBreakProcess', which generates a breakpoint exception in the interior process. */ DebugBreakProcess = GETPROCADDRESS (dll, DebugBreakProcess); if (DebugBreakProcess != NULL && DebugBreakProcess (current_process_handle)) return; /* Last resort, suspend all threads manually. */ soft_interrupt_requested = 1; } static const char * win32_arch_string (void) { return the_low_target.arch_string; } #ifdef _WIN32_WCE int win32_error_to_fileio_error (DWORD err) { switch (err) { case ERROR_BAD_PATHNAME: case ERROR_FILE_NOT_FOUND: case ERROR_INVALID_NAME: case ERROR_PATH_NOT_FOUND: return FILEIO_ENOENT; case ERROR_CRC: case ERROR_IO_DEVICE: case ERROR_OPEN_FAILED: return FILEIO_EIO; case ERROR_INVALID_HANDLE: return FILEIO_EBADF; case ERROR_ACCESS_DENIED: case ERROR_SHARING_VIOLATION: return FILEIO_EACCES; case ERROR_NOACCESS: return FILEIO_EFAULT; case ERROR_BUSY: return FILEIO_EBUSY; case ERROR_ALREADY_EXISTS: case ERROR_FILE_EXISTS: return FILEIO_EEXIST; case ERROR_BAD_DEVICE: return FILEIO_ENODEV; case ERROR_DIRECTORY: return FILEIO_ENOTDIR; case ERROR_FILENAME_EXCED_RANGE: case ERROR_INVALID_DATA: case ERROR_INVALID_PARAMETER: case ERROR_NEGATIVE_SEEK: return FILEIO_EINVAL; case ERROR_TOO_MANY_OPEN_FILES: return FILEIO_EMFILE; case ERROR_HANDLE_DISK_FULL: case ERROR_DISK_FULL: return FILEIO_ENOSPC; case ERROR_WRITE_PROTECT: return FILEIO_EROFS; case ERROR_NOT_SUPPORTED: return FILEIO_ENOSYS; } return FILEIO_EUNKNOWN; } static void wince_hostio_last_error (char *buf) { DWORD winerr = GetLastError (); int fileio_err = win32_error_to_fileio_error (winerr); sprintf (buf, "F-1,%x", fileio_err); } #endif static struct target_ops win32_target_ops = { win32_create_inferior, win32_attach, win32_kill, win32_detach, win32_join, win32_thread_alive, win32_resume, win32_wait, win32_fetch_inferior_registers, win32_store_inferior_registers, win32_read_inferior_memory, win32_write_inferior_memory, NULL, win32_request_interrupt, NULL, NULL, NULL, NULL, NULL, NULL, NULL, win32_arch_string, NULL, #ifdef _WIN32_WCE wince_hostio_last_error, #else hostio_last_error_from_errno, #endif }; /* Initialize the Win32 backend. */ void initialize_low (void) { set_target_ops (&win32_target_ops); if (the_low_target.breakpoint != NULL) set_breakpoint_data (the_low_target.breakpoint, the_low_target.breakpoint_len); init_registers (); }
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