/* Target-vector operations for controlling windows child processes, for GDB. Copyright (C) 1995-2014 Free Software Foundation, Inc. Contributed by Cygnus Solutions, A Red Hat Company. 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 . */ /* Originally by Steve Chamberlain, sac@cygnus.com */ #include "defs.h" #include "frame.h" /* required by inferior.h */ #include "inferior.h" #include "target.h" #include "exceptions.h" #include "gdbcore.h" #include "command.h" #include "completer.h" #include "regcache.h" #include "top.h" #include #include #include #include #include #include #include #ifdef __CYGWIN__ #include #include #include #endif #include "buildsym.h" #include "filenames.h" #include "symfile.h" #include "objfiles.h" #include "gdb_bfd.h" #include "gdb_obstack.h" #include #include "gdbthread.h" #include "gdbcmd.h" #include #include "exec.h" #include "solist.h" #include "solib.h" #include "xml-support.h" #include "i386-tdep.h" #include "i387-tdep.h" #include "windows-tdep.h" #include "windows-nat.h" #include "i386-nat.h" #include "complaints.h" #define AdjustTokenPrivileges dyn_AdjustTokenPrivileges #define DebugActiveProcessStop dyn_DebugActiveProcessStop #define DebugBreakProcess dyn_DebugBreakProcess #define DebugSetProcessKillOnExit dyn_DebugSetProcessKillOnExit #define EnumProcessModules dyn_EnumProcessModules #define GetModuleInformation dyn_GetModuleInformation #define LookupPrivilegeValueA dyn_LookupPrivilegeValueA #define OpenProcessToken dyn_OpenProcessToken #define GetConsoleFontSize dyn_GetConsoleFontSize #define GetCurrentConsoleFont dyn_GetCurrentConsoleFont static BOOL WINAPI (*AdjustTokenPrivileges)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD); static BOOL WINAPI (*DebugActiveProcessStop) (DWORD); static BOOL WINAPI (*DebugBreakProcess) (HANDLE); static BOOL WINAPI (*DebugSetProcessKillOnExit) (BOOL); static BOOL WINAPI (*EnumProcessModules) (HANDLE, HMODULE *, DWORD, LPDWORD); static BOOL WINAPI (*GetModuleInformation) (HANDLE, HMODULE, LPMODULEINFO, DWORD); static BOOL WINAPI (*LookupPrivilegeValueA)(LPCSTR, LPCSTR, PLUID); static BOOL WINAPI (*OpenProcessToken)(HANDLE, DWORD, PHANDLE); static BOOL WINAPI (*GetCurrentConsoleFont) (HANDLE, BOOL, CONSOLE_FONT_INFO *); static COORD WINAPI (*GetConsoleFontSize) (HANDLE, DWORD); static struct target_ops windows_ops; #undef STARTUPINFO #undef CreateProcess #undef GetModuleFileNameEx #ifndef __CYGWIN__ # define __PMAX (MAX_PATH + 1) static DWORD WINAPI (*GetModuleFileNameEx) (HANDLE, HMODULE, LPSTR, DWORD); # define STARTUPINFO STARTUPINFOA # define CreateProcess CreateProcessA # define GetModuleFileNameEx_name "GetModuleFileNameExA" # define bad_GetModuleFileNameEx bad_GetModuleFileNameExA #else # define __PMAX PATH_MAX /* The starting and ending address of the cygwin1.dll text segment. */ static CORE_ADDR cygwin_load_start; static CORE_ADDR cygwin_load_end; # define __USEWIDE typedef wchar_t cygwin_buf_t; static DWORD WINAPI (*GetModuleFileNameEx) (HANDLE, HMODULE, LPWSTR, DWORD); # define STARTUPINFO STARTUPINFOW # define CreateProcess CreateProcessW # define GetModuleFileNameEx_name "GetModuleFileNameExW" # define bad_GetModuleFileNameEx bad_GetModuleFileNameExW #endif static int have_saved_context; /* True if we've saved context from a cygwin signal. */ static CONTEXT saved_context; /* Containes the saved context from a cygwin signal. */ /* If we're not using the old Cygwin header file set, define the following which never should have been in the generic Win32 API headers in the first place since they were our own invention... */ #ifndef _GNU_H_WINDOWS_H enum { FLAG_TRACE_BIT = 0x100, CONTEXT_DEBUGGER = (CONTEXT_FULL | CONTEXT_FLOATING_POINT) }; #endif #ifndef CONTEXT_EXTENDED_REGISTERS /* This macro is only defined on ia32. It only makes sense on this target, so define it as zero if not already defined. */ #define CONTEXT_EXTENDED_REGISTERS 0 #endif #define CONTEXT_DEBUGGER_DR CONTEXT_DEBUGGER | CONTEXT_DEBUG_REGISTERS \ | CONTEXT_EXTENDED_REGISTERS static uintptr_t dr[8]; static int debug_registers_changed; static int debug_registers_used; static int windows_initialization_done; #define DR6_CLEAR_VALUE 0xffff0ff0 /* The string sent by cygwin when it processes a signal. FIXME: This should be in a cygwin include file. */ #ifndef _CYGWIN_SIGNAL_STRING #define _CYGWIN_SIGNAL_STRING "cYgSiGw00f" #endif #define CHECK(x) check (x, __FILE__,__LINE__) #define DEBUG_EXEC(x) if (debug_exec) printf_unfiltered x #define DEBUG_EVENTS(x) if (debug_events) printf_unfiltered x #define DEBUG_MEM(x) if (debug_memory) printf_unfiltered x #define DEBUG_EXCEPT(x) if (debug_exceptions) printf_unfiltered x static void windows_stop (struct target_ops *self, ptid_t); static int windows_thread_alive (struct target_ops *, ptid_t); static void windows_kill_inferior (struct target_ops *); static void cygwin_set_dr (int i, CORE_ADDR addr); static void cygwin_set_dr7 (unsigned long val); static CORE_ADDR cygwin_get_dr (int i); static unsigned long cygwin_get_dr6 (void); static unsigned long cygwin_get_dr7 (void); static enum gdb_signal last_sig = GDB_SIGNAL_0; /* Set if a signal was received from the debugged process. */ /* Thread information structure used to track information that is not available in gdb's thread structure. */ typedef struct thread_info_struct { struct thread_info_struct *next; DWORD id; HANDLE h; CORE_ADDR thread_local_base; char *name; int suspended; int reload_context; CONTEXT context; STACKFRAME sf; } thread_info; static thread_info thread_head; /* The process and thread handles for the above context. */ static DEBUG_EVENT current_event; /* The current debug event from WaitForDebugEvent */ static HANDLE current_process_handle; /* Currently executing process */ static thread_info *current_thread; /* Info on currently selected thread */ static DWORD main_thread_id; /* Thread ID of the main thread */ /* Counts of things. */ static int exception_count = 0; static int event_count = 0; static int saw_create; static int open_process_used = 0; /* User options. */ static int new_console = 0; #ifdef __CYGWIN__ static int cygwin_exceptions = 0; #endif static int new_group = 1; static int debug_exec = 0; /* show execution */ static int debug_events = 0; /* show events from kernel */ static int debug_memory = 0; /* show target memory accesses */ static int debug_exceptions = 0; /* show target exceptions */ static int useshell = 0; /* use shell for subprocesses */ /* This vector maps GDB's idea of a register's number into an offset in the windows exception context vector. It also contains the bit mask needed to load the register in question. The contents of this table can only be computed by the units that provide CPU-specific support for Windows native debugging. These units should set the table by calling windows_set_context_register_offsets. One day we could read a reg, we could inspect the context we already have loaded, if it doesn't have the bit set that we need, we read that set of registers in using GetThreadContext. If the context already contains what we need, we just unpack it. Then to write a register, first we have to ensure that the context contains the other regs of the group, and then we copy the info in and set out bit. */ static const int *mappings; /* The function to use in order to determine whether a register is a segment register or not. */ static segment_register_p_ftype *segment_register_p; /* This vector maps the target's idea of an exception (extracted from the DEBUG_EVENT structure) to GDB's idea. */ struct xlate_exception { int them; enum gdb_signal us; }; static const struct xlate_exception xlate[] = { {EXCEPTION_ACCESS_VIOLATION, GDB_SIGNAL_SEGV}, {STATUS_STACK_OVERFLOW, GDB_SIGNAL_SEGV}, {EXCEPTION_BREAKPOINT, GDB_SIGNAL_TRAP}, {DBG_CONTROL_C, GDB_SIGNAL_INT}, {EXCEPTION_SINGLE_STEP, GDB_SIGNAL_TRAP}, {STATUS_FLOAT_DIVIDE_BY_ZERO, GDB_SIGNAL_FPE}, {-1, -1}}; /* Set the MAPPINGS static global to OFFSETS. See the description of MAPPINGS for more details. */ void windows_set_context_register_offsets (const int *offsets) { mappings = offsets; } /* See windows-nat.h. */ void windows_set_segment_register_p (segment_register_p_ftype *fun) { segment_register_p = fun; } static void check (BOOL ok, const char *file, int line) { if (!ok) printf_filtered ("error return %s:%d was %u\n", file, line, (unsigned) GetLastError ()); } /* Find a thread record given a thread id. If GET_CONTEXT is not 0, then also retrieve the context for this thread. If GET_CONTEXT is negative, then don't suspend the thread. */ static thread_info * thread_rec (DWORD id, int get_context) { thread_info *th; for (th = &thread_head; (th = th->next) != NULL;) if (th->id == id) { if (!th->suspended && get_context) { if (get_context > 0 && id != current_event.dwThreadId) { if (SuspendThread (th->h) == (DWORD) -1) { DWORD err = GetLastError (); warning (_("SuspendThread (tid=0x%x) failed." " (winerr %u)"), (unsigned) id, (unsigned) err); return NULL; } th->suspended = 1; } else if (get_context < 0) th->suspended = -1; th->reload_context = 1; } return th; } return NULL; } /* Add a thread to the thread list. */ static thread_info * windows_add_thread (ptid_t ptid, HANDLE h, void *tlb) { thread_info *th; DWORD id; gdb_assert (ptid_get_tid (ptid) != 0); id = ptid_get_tid (ptid); if ((th = thread_rec (id, FALSE))) return th; th = XCNEW (thread_info); th->id = id; th->h = h; th->thread_local_base = (CORE_ADDR) (uintptr_t) tlb; th->next = thread_head.next; thread_head.next = th; add_thread (ptid); /* Set the debug registers for the new thread if they are used. */ if (debug_registers_used) { /* Only change the value of the debug registers. */ th->context.ContextFlags = CONTEXT_DEBUG_REGISTERS; CHECK (GetThreadContext (th->h, &th->context)); th->context.Dr0 = dr[0]; th->context.Dr1 = dr[1]; th->context.Dr2 = dr[2]; th->context.Dr3 = dr[3]; th->context.Dr6 = DR6_CLEAR_VALUE; th->context.Dr7 = dr[7]; CHECK (SetThreadContext (th->h, &th->context)); th->context.ContextFlags = 0; } return th; } /* Clear out any old thread list and reintialize it to a pristine state. */ static void windows_init_thread_list (void) { thread_info *th = &thread_head; DEBUG_EVENTS (("gdb: windows_init_thread_list\n")); init_thread_list (); while (th->next != NULL) { thread_info *here = th->next; th->next = here->next; xfree (here); } thread_head.next = NULL; } /* Delete a thread from the list of threads. */ static void windows_delete_thread (ptid_t ptid, DWORD exit_code) { thread_info *th; DWORD id; gdb_assert (ptid_get_tid (ptid) != 0); id = ptid_get_tid (ptid); if (info_verbose) printf_unfiltered ("[Deleting %s]\n", target_pid_to_str (ptid)); else if (print_thread_events && id != main_thread_id) printf_unfiltered (_("[%s exited with code %u]\n"), target_pid_to_str (ptid), (unsigned) exit_code); delete_thread (ptid); for (th = &thread_head; th->next != NULL && th->next->id != id; th = th->next) continue; if (th->next != NULL) { thread_info *here = th->next; th->next = here->next; xfree (here); } } static void do_windows_fetch_inferior_registers (struct regcache *regcache, int r) { char *context_offset = ((char *) ¤t_thread->context) + mappings[r]; struct gdbarch *gdbarch = get_regcache_arch (regcache); struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); long l; if (!current_thread) return; /* Windows sometimes uses a non-existent thread id in its events. */ if (current_thread->reload_context) { #ifdef __COPY_CONTEXT_SIZE if (have_saved_context) { /* Lie about where the program actually is stopped since cygwin has informed us that we should consider the signal to have occurred at another location which is stored in "saved_context. */ memcpy (¤t_thread->context, &saved_context, __COPY_CONTEXT_SIZE); have_saved_context = 0; } else #endif { thread_info *th = current_thread; th->context.ContextFlags = CONTEXT_DEBUGGER_DR; GetThreadContext (th->h, &th->context); /* Copy dr values from that thread. But only if there were not modified since last stop. PR gdb/2388 */ if (!debug_registers_changed) { dr[0] = th->context.Dr0; dr[1] = th->context.Dr1; dr[2] = th->context.Dr2; dr[3] = th->context.Dr3; dr[6] = th->context.Dr6; dr[7] = th->context.Dr7; } } current_thread->reload_context = 0; } if (r == I387_FISEG_REGNUM (tdep)) { l = *((long *) context_offset) & 0xffff; regcache_raw_supply (regcache, r, (char *) &l); } else if (r == I387_FOP_REGNUM (tdep)) { l = (*((long *) context_offset) >> 16) & ((1 << 11) - 1); regcache_raw_supply (regcache, r, (char *) &l); } else if (segment_register_p (r)) { /* GDB treats segment registers as 32bit registers, but they are in fact only 16 bits long. Make sure we do not read extra bits from our source buffer. */ l = *((long *) context_offset) & 0xffff; regcache_raw_supply (regcache, r, (char *) &l); } else if (r >= 0) regcache_raw_supply (regcache, r, context_offset); else { for (r = 0; r < gdbarch_num_regs (gdbarch); r++) do_windows_fetch_inferior_registers (regcache, r); } } static void windows_fetch_inferior_registers (struct target_ops *ops, struct regcache *regcache, int r) { current_thread = thread_rec (ptid_get_tid (inferior_ptid), TRUE); /* Check if current_thread exists. Windows sometimes uses a non-existent thread id in its events. */ if (current_thread) do_windows_fetch_inferior_registers (regcache, r); } static void do_windows_store_inferior_registers (const struct regcache *regcache, int r) { if (!current_thread) /* Windows sometimes uses a non-existent thread id in its events. */; else if (r >= 0) regcache_raw_collect (regcache, r, ((char *) ¤t_thread->context) + mappings[r]); else { for (r = 0; r < gdbarch_num_regs (get_regcache_arch (regcache)); r++) do_windows_store_inferior_registers (regcache, r); } } /* Store a new register value into the current thread context. */ static void windows_store_inferior_registers (struct target_ops *ops, struct regcache *regcache, int r) { current_thread = thread_rec (ptid_get_tid (inferior_ptid), TRUE); /* Check if current_thread exists. Windows sometimes uses a non-existent thread id in its events. */ if (current_thread) do_windows_store_inferior_registers (regcache, r); } /* Encapsulate the information required in a call to symbol_file_add_args. */ struct safe_symbol_file_add_args { char *name; int from_tty; struct section_addr_info *addrs; int mainline; int flags; struct ui_file *err, *out; struct objfile *ret; }; /* Maintain a linked list of "so" information. */ struct lm_info { LPVOID load_addr; }; static struct so_list solib_start, *solib_end; /* Call symbol_file_add with stderr redirected. We don't care if there are errors. */ static int safe_symbol_file_add_stub (void *argv) { #define p ((struct safe_symbol_file_add_args *) argv) const int add_flags = ((p->from_tty ? SYMFILE_VERBOSE : 0) | (p->mainline ? SYMFILE_MAINLINE : 0)); p->ret = symbol_file_add (p->name, add_flags, p->addrs, p->flags); return !!p->ret; #undef p } /* Restore gdb's stderr after calling symbol_file_add. */ static void safe_symbol_file_add_cleanup (void *p) { #define sp ((struct safe_symbol_file_add_args *)p) gdb_flush (gdb_stderr); gdb_flush (gdb_stdout); ui_file_delete (gdb_stderr); ui_file_delete (gdb_stdout); gdb_stderr = sp->err; gdb_stdout = sp->out; #undef sp } /* symbol_file_add wrapper that prevents errors from being displayed. */ static struct objfile * safe_symbol_file_add (char *name, int from_tty, struct section_addr_info *addrs, int mainline, int flags) { struct safe_symbol_file_add_args p; struct cleanup *cleanup; cleanup = make_cleanup (safe_symbol_file_add_cleanup, &p); p.err = gdb_stderr; p.out = gdb_stdout; gdb_flush (gdb_stderr); gdb_flush (gdb_stdout); gdb_stderr = ui_file_new (); gdb_stdout = ui_file_new (); p.name = name; p.from_tty = from_tty; p.addrs = addrs; p.mainline = mainline; p.flags = flags; catch_errors (safe_symbol_file_add_stub, &p, "", RETURN_MASK_ERROR); do_cleanups (cleanup); return p.ret; } static struct so_list * windows_make_so (const char *name, LPVOID load_addr) { struct so_list *so; char *p; #ifndef __CYGWIN__ char buf[__PMAX]; char cwd[__PMAX]; WIN32_FIND_DATA w32_fd; HANDLE h = FindFirstFile(name, &w32_fd); if (h == INVALID_HANDLE_VALUE) strcpy (buf, name); else { FindClose (h); strcpy (buf, name); if (GetCurrentDirectory (MAX_PATH + 1, cwd)) { p = strrchr (buf, '\\'); if (p) p[1] = '\0'; SetCurrentDirectory (buf); GetFullPathName (w32_fd.cFileName, MAX_PATH, buf, &p); SetCurrentDirectory (cwd); } } if (strcasecmp (buf, "ntdll.dll") == 0) { GetSystemDirectory (buf, sizeof (buf)); strcat (buf, "\\ntdll.dll"); } #else cygwin_buf_t buf[__PMAX]; buf[0] = 0; if (access (name, F_OK) != 0) { if (strcasecmp (name, "ntdll.dll") == 0) #ifdef __USEWIDE { GetSystemDirectoryW (buf, sizeof (buf) / sizeof (wchar_t)); wcscat (buf, L"\\ntdll.dll"); } #else { GetSystemDirectoryA (buf, sizeof (buf) / sizeof (wchar_t)); strcat (buf, "\\ntdll.dll"); } #endif } #endif so = XCNEW (struct so_list); so->lm_info = (struct lm_info *) xmalloc (sizeof (struct lm_info)); so->lm_info->load_addr = load_addr; strcpy (so->so_original_name, name); #ifndef __CYGWIN__ strcpy (so->so_name, buf); #else if (buf[0]) cygwin_conv_path (CCP_WIN_W_TO_POSIX, buf, so->so_name, SO_NAME_MAX_PATH_SIZE); else { char *rname = realpath (name, NULL); if (rname && strlen (rname) < SO_NAME_MAX_PATH_SIZE) { strcpy (so->so_name, rname); free (rname); } else error (_("dll path too long")); } /* Record cygwin1.dll .text start/end. */ p = strchr (so->so_name, '\0') - (sizeof ("/cygwin1.dll") - 1); if (p >= so->so_name && strcasecmp (p, "/cygwin1.dll") == 0) { bfd *abfd; asection *text = NULL; CORE_ADDR text_vma; abfd = gdb_bfd_open (so->so_name, "pei-i386", -1); if (!abfd) return so; if (bfd_check_format (abfd, bfd_object)) text = bfd_get_section_by_name (abfd, ".text"); if (!text) { gdb_bfd_unref (abfd); return so; } /* The symbols in a dll are offset by 0x1000, which is the offset from 0 of the first byte in an image - because of the file header and the section alignment. */ cygwin_load_start = (CORE_ADDR) (uintptr_t) ((char *) load_addr + 0x1000); cygwin_load_end = cygwin_load_start + bfd_section_size (abfd, text); gdb_bfd_unref (abfd); } #endif return so; } static char * get_image_name (HANDLE h, void *address, int unicode) { #ifdef __CYGWIN__ static char buf[__PMAX]; #else static char buf[(2 * __PMAX) + 1]; #endif DWORD size = unicode ? sizeof (WCHAR) : sizeof (char); char *address_ptr; int len = 0; char b[2]; SIZE_T 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; /* 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; /* 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); #ifdef __CYGWIN__ wcstombs (buf, unicode_address, __PMAX); #else WideCharToMultiByte (CP_ACP, 0, unicode_address, len, buf, sizeof buf, 0, 0); #endif } return buf; } /* Handle a DLL load event, and return 1. This function assumes that this event did not occur during inferior initialization, where their event info may be incomplete (see do_initial_windows_stuff and windows_add_all_dlls for more info on how we handle DLL loading during that phase). */ static int handle_load_dll (void *dummy) { LOAD_DLL_DEBUG_INFO *event = ¤t_event.u.LoadDll; char *dll_name; /* Try getting the DLL name via the lpImageName field of the event. Note that Microsoft documents this fields as strictly optional, in the sense that it might be NULL. And the first DLL event in particular is explicitly documented as "likely not pass[ed]" (source: MSDN LOAD_DLL_DEBUG_INFO structure). */ dll_name = get_image_name (current_process_handle, event->lpImageName, event->fUnicode); if (!dll_name) return 1; solib_end->next = windows_make_so (dll_name, event->lpBaseOfDll); solib_end = solib_end->next; DEBUG_EVENTS (("gdb: Loading dll \"%s\" at %s.\n", solib_end->so_name, host_address_to_string (solib_end->lm_info->load_addr))); return 1; } static void windows_free_so (struct so_list *so) { if (so->lm_info) xfree (so->lm_info); xfree (so); } /* Handle a DLL unload event. Return 1 if successful, or zero otherwise. This function assumes that this event did not occur during inferior initialization, where their event info may be incomplete (see do_initial_windows_stuff and windows_add_all_dlls for more info on how we handle DLL loading during that phase). */ static int handle_unload_dll (void *dummy) { LPVOID lpBaseOfDll = current_event.u.UnloadDll.lpBaseOfDll; struct so_list *so; for (so = &solib_start; so->next != NULL; so = so->next) if (so->next->lm_info->load_addr == lpBaseOfDll) { struct so_list *sodel = so->next; so->next = sodel->next; if (!so->next) solib_end = so; DEBUG_EVENTS (("gdb: Unloading dll \"%s\".\n", sodel->so_name)); windows_free_so (sodel); return 1; } /* We did not find any DLL that was previously loaded at this address, so register a complaint. We do not report an error, because we have observed that this may be happening under some circumstances. For instance, running 32bit applications on x64 Windows causes us to receive 4 mysterious UNLOAD_DLL_DEBUG_EVENTs during the startup phase (these events are apparently caused by the WOW layer, the interface between 32bit and 64bit worlds). */ complaint (&symfile_complaints, _("dll starting at %s not found."), host_address_to_string (lpBaseOfDll)); return 0; } /* Clear list of loaded DLLs. */ static void windows_clear_solib (void) { solib_start.next = NULL; solib_end = &solib_start; } /* Load DLL symbol info. */ static void dll_symbol_command (char *args, int from_tty) { int n; dont_repeat (); if (args == NULL) error (_("dll-symbols requires a file name")); n = strlen (args); if (n > 4 && strcasecmp (args + n - 4, ".dll") != 0) { char *newargs = (char *) alloca (n + 4 + 1); strcpy (newargs, args); strcat (newargs, ".dll"); args = newargs; } safe_symbol_file_add (args, from_tty, NULL, 0, OBJF_SHARED | OBJF_USERLOADED); } /* Handle DEBUG_STRING output from child process. Cygwin prepends its messages with a "cygwin:". Interpret this as a Cygwin signal. Otherwise just print the string as a warning. */ static int handle_output_debug_string (struct target_waitstatus *ourstatus) { char *s = NULL; int retval = 0; if (!target_read_string ((CORE_ADDR) (uintptr_t) current_event.u.DebugString.lpDebugStringData, &s, 1024, 0) || !s || !*s) /* nothing to do */; else if (strncmp (s, _CYGWIN_SIGNAL_STRING, sizeof (_CYGWIN_SIGNAL_STRING) - 1) != 0) { #ifdef __CYGWIN__ if (strncmp (s, "cYg", 3) != 0) #endif warning (("%s"), s); } #ifdef __COPY_CONTEXT_SIZE else { /* Got a cygwin signal marker. A cygwin signal is followed by the signal number itself and then optionally followed by the thread id and address to saved context within the DLL. If these are supplied, then the given thread is assumed to have issued the signal and the context from the thread is assumed to be stored at the given address in the inferior. Tell gdb to treat this like a real signal. */ char *p; int sig = strtol (s + sizeof (_CYGWIN_SIGNAL_STRING) - 1, &p, 0); int gotasig = gdb_signal_from_host (sig); ourstatus->value.sig = gotasig; if (gotasig) { LPCVOID x; SIZE_T n; ourstatus->kind = TARGET_WAITKIND_STOPPED; retval = strtoul (p, &p, 0); if (!retval) retval = main_thread_id; else if ((x = (LPCVOID) (uintptr_t) strtoull (p, NULL, 0)) && ReadProcessMemory (current_process_handle, x, &saved_context, __COPY_CONTEXT_SIZE, &n) && n == __COPY_CONTEXT_SIZE) have_saved_context = 1; current_event.dwThreadId = retval; } } #endif if (s) xfree (s); return retval; } static int display_selector (HANDLE thread, DWORD sel) { LDT_ENTRY info; if (GetThreadSelectorEntry (thread, sel, &info)) { int base, limit; printf_filtered ("0x%03x: ", (unsigned) sel); if (!info.HighWord.Bits.Pres) { puts_filtered ("Segment not present\n"); return 0; } base = (info.HighWord.Bits.BaseHi << 24) + (info.HighWord.Bits.BaseMid << 16) + info.BaseLow; limit = (info.HighWord.Bits.LimitHi << 16) + info.LimitLow; if (info.HighWord.Bits.Granularity) limit = (limit << 12) | 0xfff; printf_filtered ("base=0x%08x limit=0x%08x", base, limit); if (info.HighWord.Bits.Default_Big) puts_filtered(" 32-bit "); else puts_filtered(" 16-bit "); switch ((info.HighWord.Bits.Type & 0xf) >> 1) { case 0: puts_filtered ("Data (Read-Only, Exp-up"); break; case 1: puts_filtered ("Data (Read/Write, Exp-up"); break; case 2: puts_filtered ("Unused segment ("); break; case 3: puts_filtered ("Data (Read/Write, Exp-down"); break; case 4: puts_filtered ("Code (Exec-Only, N.Conf"); break; case 5: puts_filtered ("Code (Exec/Read, N.Conf"); break; case 6: puts_filtered ("Code (Exec-Only, Conf"); break; case 7: puts_filtered ("Code (Exec/Read, Conf"); break; default: printf_filtered ("Unknown type 0x%x",info.HighWord.Bits.Type); } if ((info.HighWord.Bits.Type & 0x1) == 0) puts_filtered(", N.Acc"); puts_filtered (")\n"); if ((info.HighWord.Bits.Type & 0x10) == 0) puts_filtered("System selector "); printf_filtered ("Priviledge level = %d. ", info.HighWord.Bits.Dpl); if (info.HighWord.Bits.Granularity) puts_filtered ("Page granular.\n"); else puts_filtered ("Byte granular.\n"); return 1; } else { DWORD err = GetLastError (); if (err == ERROR_NOT_SUPPORTED) printf_filtered ("Function not supported\n"); else printf_filtered ("Invalid selector 0x%x.\n", (unsigned) sel); return 0; } } static void display_selectors (char * args, int from_tty) { if (!current_thread) { puts_filtered ("Impossible to display selectors now.\n"); return; } if (!args) { puts_filtered ("Selector $cs\n"); display_selector (current_thread->h, current_thread->context.SegCs); puts_filtered ("Selector $ds\n"); display_selector (current_thread->h, current_thread->context.SegDs); puts_filtered ("Selector $es\n"); display_selector (current_thread->h, current_thread->context.SegEs); puts_filtered ("Selector $ss\n"); display_selector (current_thread->h, current_thread->context.SegSs); puts_filtered ("Selector $fs\n"); display_selector (current_thread->h, current_thread->context.SegFs); puts_filtered ("Selector $gs\n"); display_selector (current_thread->h, current_thread->context.SegGs); } else { int sel; sel = parse_and_eval_long (args); printf_filtered ("Selector \"%s\"\n",args); display_selector (current_thread->h, sel); } } #define DEBUG_EXCEPTION_SIMPLE(x) if (debug_exceptions) \ printf_unfiltered ("gdb: Target exception %s at %s\n", x, \ host_address_to_string (\ current_event.u.Exception.ExceptionRecord.ExceptionAddress)) static int handle_exception (struct target_waitstatus *ourstatus) { thread_info *th; DWORD code = current_event.u.Exception.ExceptionRecord.ExceptionCode; ourstatus->kind = TARGET_WAITKIND_STOPPED; /* Record the context of the current thread. */ th = thread_rec (current_event.dwThreadId, -1); switch (code) { case EXCEPTION_ACCESS_VIOLATION: DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_ACCESS_VIOLATION"); ourstatus->value.sig = GDB_SIGNAL_SEGV; #ifdef __CYGWIN__ { /* See if the access violation happened within the cygwin DLL itself. Cygwin uses a kind of exception handling to deal with passed-in invalid addresses. gdb should not treat these as real SEGVs since they will be silently handled by cygwin. A real SEGV will (theoretically) be caught by cygwin later in the process and will be sent as a cygwin-specific-signal. So, ignore SEGVs if they show up within the text segment of the DLL itself. */ const char *fn; CORE_ADDR addr = (CORE_ADDR) (uintptr_t) current_event.u.Exception.ExceptionRecord.ExceptionAddress; if ((!cygwin_exceptions && (addr >= cygwin_load_start && addr < cygwin_load_end)) || (find_pc_partial_function (addr, &fn, NULL, NULL) && strncmp (fn, "KERNEL32!IsBad", strlen ("KERNEL32!IsBad")) == 0)) return 0; } #endif break; case STATUS_STACK_OVERFLOW: DEBUG_EXCEPTION_SIMPLE ("STATUS_STACK_OVERFLOW"); ourstatus->value.sig = GDB_SIGNAL_SEGV; break; case STATUS_FLOAT_DENORMAL_OPERAND: DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_DENORMAL_OPERAND"); ourstatus->value.sig = GDB_SIGNAL_FPE; break; case EXCEPTION_ARRAY_BOUNDS_EXCEEDED: DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_ARRAY_BOUNDS_EXCEEDED"); ourstatus->value.sig = GDB_SIGNAL_FPE; break; case STATUS_FLOAT_INEXACT_RESULT: DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_INEXACT_RESULT"); ourstatus->value.sig = GDB_SIGNAL_FPE; break; case STATUS_FLOAT_INVALID_OPERATION: DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_INVALID_OPERATION"); ourstatus->value.sig = GDB_SIGNAL_FPE; break; case STATUS_FLOAT_OVERFLOW: DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_OVERFLOW"); ourstatus->value.sig = GDB_SIGNAL_FPE; break; case STATUS_FLOAT_STACK_CHECK: DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_STACK_CHECK"); ourstatus->value.sig = GDB_SIGNAL_FPE; break; case STATUS_FLOAT_UNDERFLOW: DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_UNDERFLOW"); ourstatus->value.sig = GDB_SIGNAL_FPE; break; case STATUS_FLOAT_DIVIDE_BY_ZERO: DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_DIVIDE_BY_ZERO"); ourstatus->value.sig = GDB_SIGNAL_FPE; break; case STATUS_INTEGER_DIVIDE_BY_ZERO: DEBUG_EXCEPTION_SIMPLE ("STATUS_INTEGER_DIVIDE_BY_ZERO"); ourstatus->value.sig = GDB_SIGNAL_FPE; break; case STATUS_INTEGER_OVERFLOW: DEBUG_EXCEPTION_SIMPLE ("STATUS_INTEGER_OVERFLOW"); ourstatus->value.sig = GDB_SIGNAL_FPE; break; case EXCEPTION_BREAKPOINT: DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_BREAKPOINT"); ourstatus->value.sig = GDB_SIGNAL_TRAP; break; case DBG_CONTROL_C: DEBUG_EXCEPTION_SIMPLE ("DBG_CONTROL_C"); ourstatus->value.sig = GDB_SIGNAL_INT; break; case DBG_CONTROL_BREAK: DEBUG_EXCEPTION_SIMPLE ("DBG_CONTROL_BREAK"); ourstatus->value.sig = GDB_SIGNAL_INT; break; case EXCEPTION_SINGLE_STEP: DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_SINGLE_STEP"); ourstatus->value.sig = GDB_SIGNAL_TRAP; break; case EXCEPTION_ILLEGAL_INSTRUCTION: DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_ILLEGAL_INSTRUCTION"); ourstatus->value.sig = GDB_SIGNAL_ILL; break; case EXCEPTION_PRIV_INSTRUCTION: DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_PRIV_INSTRUCTION"); ourstatus->value.sig = GDB_SIGNAL_ILL; break; case EXCEPTION_NONCONTINUABLE_EXCEPTION: DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_NONCONTINUABLE_EXCEPTION"); ourstatus->value.sig = GDB_SIGNAL_ILL; break; default: /* Treat unhandled first chance exceptions specially. */ if (current_event.u.Exception.dwFirstChance) return -1; printf_unfiltered ("gdb: unknown target exception 0x%08x at %s\n", (unsigned) current_event.u.Exception.ExceptionRecord.ExceptionCode, host_address_to_string ( current_event.u.Exception.ExceptionRecord.ExceptionAddress)); ourstatus->value.sig = GDB_SIGNAL_UNKNOWN; break; } exception_count++; last_sig = ourstatus->value.sig; return 1; } /* Resume all artificially suspended threads if we are continuing execution. */ static BOOL windows_continue (DWORD continue_status, int id) { int i; thread_info *th; BOOL res; DEBUG_EVENTS (("ContinueDebugEvent (cpid=%d, ctid=0x%x, %s);\n", (unsigned) current_event.dwProcessId, (unsigned) current_event.dwThreadId, continue_status == DBG_CONTINUE ? "DBG_CONTINUE" : "DBG_EXCEPTION_NOT_HANDLED")); for (th = &thread_head; (th = th->next) != NULL;) if ((id == -1 || id == (int) th->id) && th->suspended) { if (debug_registers_changed) { th->context.ContextFlags |= CONTEXT_DEBUG_REGISTERS; th->context.Dr0 = dr[0]; th->context.Dr1 = dr[1]; th->context.Dr2 = dr[2]; th->context.Dr3 = dr[3]; th->context.Dr6 = DR6_CLEAR_VALUE; th->context.Dr7 = dr[7]; } if (th->context.ContextFlags) { CHECK (SetThreadContext (th->h, &th->context)); th->context.ContextFlags = 0; } if (th->suspended > 0) (void) ResumeThread (th->h); th->suspended = 0; } res = ContinueDebugEvent (current_event.dwProcessId, current_event.dwThreadId, continue_status); debug_registers_changed = 0; return res; } /* Called in pathological case where Windows fails to send a CREATE_PROCESS_DEBUG_EVENT after an attach. */ static DWORD fake_create_process (void) { current_process_handle = OpenProcess (PROCESS_ALL_ACCESS, FALSE, current_event.dwProcessId); if (current_process_handle != NULL) open_process_used = 1; else { error (_("OpenProcess call failed, GetLastError = %u"), (unsigned) GetLastError ()); /* We can not debug anything in that case. */ } main_thread_id = current_event.dwThreadId; current_thread = windows_add_thread ( ptid_build (current_event.dwProcessId, 0, current_event.dwThreadId), current_event.u.CreateThread.hThread, current_event.u.CreateThread.lpThreadLocalBase); return main_thread_id; } static void windows_resume (struct target_ops *ops, ptid_t ptid, int step, enum gdb_signal sig) { thread_info *th; DWORD continue_status = DBG_CONTINUE; /* A specific PTID means `step only this thread id'. */ int resume_all = ptid_equal (ptid, minus_one_ptid); /* If we're continuing all threads, it's the current inferior that should be handled specially. */ if (resume_all) ptid = inferior_ptid; if (sig != GDB_SIGNAL_0) { if (current_event.dwDebugEventCode != EXCEPTION_DEBUG_EVENT) { DEBUG_EXCEPT(("Cannot continue with signal %d here.\n",sig)); } else if (sig == last_sig) continue_status = DBG_EXCEPTION_NOT_HANDLED; else #if 0 /* This code does not seem to work, because the kernel does probably not consider changes in the ExceptionRecord structure when passing the exception to the inferior. Note that this seems possible in the exception handler itself. */ { int i; for (i = 0; xlate[i].them != -1; i++) if (xlate[i].us == sig) { current_event.u.Exception.ExceptionRecord.ExceptionCode = xlate[i].them; continue_status = DBG_EXCEPTION_NOT_HANDLED; break; } if (continue_status == DBG_CONTINUE) { DEBUG_EXCEPT(("Cannot continue with signal %d.\n",sig)); } } #endif DEBUG_EXCEPT(("Can only continue with recieved signal %d.\n", last_sig)); } last_sig = GDB_SIGNAL_0; DEBUG_EXEC (("gdb: windows_resume (pid=%d, tid=%ld, step=%d, sig=%d);\n", ptid_get_pid (ptid), ptid_get_tid (ptid), step, sig)); /* Get context for currently selected thread. */ th = thread_rec (ptid_get_tid (inferior_ptid), FALSE); if (th) { if (step) { /* Single step by setting t bit. */ struct regcache *regcache = get_current_regcache (); struct gdbarch *gdbarch = get_regcache_arch (regcache); windows_fetch_inferior_registers (ops, regcache, gdbarch_ps_regnum (gdbarch)); th->context.EFlags |= FLAG_TRACE_BIT; } if (th->context.ContextFlags) { if (debug_registers_changed) { th->context.Dr0 = dr[0]; th->context.Dr1 = dr[1]; th->context.Dr2 = dr[2]; th->context.Dr3 = dr[3]; th->context.Dr6 = DR6_CLEAR_VALUE; th->context.Dr7 = dr[7]; } CHECK (SetThreadContext (th->h, &th->context)); th->context.ContextFlags = 0; } } /* Allow continuing with the same signal that interrupted us. Otherwise complain. */ if (resume_all) windows_continue (continue_status, -1); else windows_continue (continue_status, ptid_get_tid (ptid)); } /* Ctrl-C handler used when the inferior is not run in the same console. The handler is in charge of interrupting the inferior using DebugBreakProcess. Note that this function is not available prior to Windows XP. In this case we emit a warning. */ static BOOL WINAPI ctrl_c_handler (DWORD event_type) { const int attach_flag = current_inferior ()->attach_flag; /* Only handle Ctrl-C and Ctrl-Break events. Ignore others. */ if (event_type != CTRL_C_EVENT && event_type != CTRL_BREAK_EVENT) return FALSE; /* If the inferior and the debugger share the same console, do nothing as the inferior has also received the Ctrl-C event. */ if (!new_console && !attach_flag) return TRUE; if (!DebugBreakProcess (current_process_handle)) warning (_("Could not interrupt program. " "Press Ctrl-c in the program console.")); /* Return true to tell that Ctrl-C has been handled. */ return TRUE; } /* Get the next event from the child. Return 1 if the event requires handling by WFI (or whatever). */ static int get_windows_debug_event (struct target_ops *ops, int pid, struct target_waitstatus *ourstatus) { BOOL debug_event; DWORD continue_status, event_code; thread_info *th; static thread_info dummy_thread_info; int retval = 0; last_sig = GDB_SIGNAL_0; if (!(debug_event = WaitForDebugEvent (¤t_event, 1000))) goto out; event_count++; continue_status = DBG_CONTINUE; event_code = current_event.dwDebugEventCode; ourstatus->kind = TARGET_WAITKIND_SPURIOUS; th = NULL; have_saved_context = 0; switch (event_code) { case CREATE_THREAD_DEBUG_EVENT: DEBUG_EVENTS (("gdb: kernel event for pid=%u tid=0x%x code=%s)\n", (unsigned) current_event.dwProcessId, (unsigned) current_event.dwThreadId, "CREATE_THREAD_DEBUG_EVENT")); if (saw_create != 1) { struct inferior *inf; inf = find_inferior_pid (current_event.dwProcessId); if (!saw_create && inf->attach_flag) { /* Kludge around a Windows bug where first event is a create thread event. Caused when attached process does not have a main thread. */ retval = fake_create_process (); if (retval) saw_create++; } break; } /* Record the existence of this thread. */ retval = current_event.dwThreadId; th = windows_add_thread (ptid_build (current_event.dwProcessId, 0, current_event.dwThreadId), current_event.u.CreateThread.hThread, current_event.u.CreateThread.lpThreadLocalBase); break; case EXIT_THREAD_DEBUG_EVENT: DEBUG_EVENTS (("gdb: kernel event for pid=%u tid=0x%x code=%s)\n", (unsigned) current_event.dwProcessId, (unsigned) current_event.dwThreadId, "EXIT_THREAD_DEBUG_EVENT")); if (current_event.dwThreadId != main_thread_id) { windows_delete_thread (ptid_build (current_event.dwProcessId, 0, current_event.dwThreadId), current_event.u.ExitThread.dwExitCode); th = &dummy_thread_info; } break; case CREATE_PROCESS_DEBUG_EVENT: DEBUG_EVENTS (("gdb: kernel event for pid=%u tid=0x%x code=%s)\n", (unsigned) current_event.dwProcessId, (unsigned) current_event.dwThreadId, "CREATE_PROCESS_DEBUG_EVENT")); CloseHandle (current_event.u.CreateProcessInfo.hFile); if (++saw_create != 1) break; current_process_handle = current_event.u.CreateProcessInfo.hProcess; if (main_thread_id) windows_delete_thread (ptid_build (current_event.dwProcessId, 0, main_thread_id), 0); main_thread_id = current_event.dwThreadId; /* Add the main thread. */ th = windows_add_thread (ptid_build (current_event.dwProcessId, 0, current_event.dwThreadId), current_event.u.CreateProcessInfo.hThread, current_event.u.CreateProcessInfo.lpThreadLocalBase); retval = current_event.dwThreadId; break; case EXIT_PROCESS_DEBUG_EVENT: DEBUG_EVENTS (("gdb: kernel event for pid=%u tid=0x%x code=%s)\n", (unsigned) current_event.dwProcessId, (unsigned) current_event.dwThreadId, "EXIT_PROCESS_DEBUG_EVENT")); if (!windows_initialization_done) { target_terminal_ours (); target_mourn_inferior (); error (_("During startup program exited with code 0x%x."), (unsigned int) current_event.u.ExitProcess.dwExitCode); } else if (saw_create == 1) { ourstatus->kind = TARGET_WAITKIND_EXITED; ourstatus->value.integer = current_event.u.ExitProcess.dwExitCode; retval = main_thread_id; } break; case LOAD_DLL_DEBUG_EVENT: DEBUG_EVENTS (("gdb: kernel event for pid=%u tid=0x%x code=%s)\n", (unsigned) current_event.dwProcessId, (unsigned) current_event.dwThreadId, "LOAD_DLL_DEBUG_EVENT")); CloseHandle (current_event.u.LoadDll.hFile); if (saw_create != 1 || ! windows_initialization_done) break; catch_errors (handle_load_dll, NULL, (char *) "", RETURN_MASK_ALL); ourstatus->kind = TARGET_WAITKIND_LOADED; ourstatus->value.integer = 0; retval = main_thread_id; break; case UNLOAD_DLL_DEBUG_EVENT: DEBUG_EVENTS (("gdb: kernel event for pid=%u tid=0x%x code=%s)\n", (unsigned) current_event.dwProcessId, (unsigned) current_event.dwThreadId, "UNLOAD_DLL_DEBUG_EVENT")); if (saw_create != 1 || ! windows_initialization_done) break; catch_errors (handle_unload_dll, NULL, (char *) "", RETURN_MASK_ALL); ourstatus->kind = TARGET_WAITKIND_LOADED; ourstatus->value.integer = 0; retval = main_thread_id; break; case EXCEPTION_DEBUG_EVENT: DEBUG_EVENTS (("gdb: kernel event for pid=%u tid=0x%x code=%s)\n", (unsigned) current_event.dwProcessId, (unsigned) current_event.dwThreadId, "EXCEPTION_DEBUG_EVENT")); if (saw_create != 1) break; switch (handle_exception (ourstatus)) { case 0: continue_status = DBG_EXCEPTION_NOT_HANDLED; break; case 1: retval = current_event.dwThreadId; break; case -1: last_sig = 1; continue_status = -1; break; } break; case OUTPUT_DEBUG_STRING_EVENT: /* Message from the kernel. */ DEBUG_EVENTS (("gdb: kernel event for pid=%u tid=0x%x code=%s)\n", (unsigned) current_event.dwProcessId, (unsigned) current_event.dwThreadId, "OUTPUT_DEBUG_STRING_EVENT")); if (saw_create != 1) break; retval = handle_output_debug_string (ourstatus); break; default: if (saw_create != 1) break; printf_unfiltered ("gdb: kernel event for pid=%u tid=0x%x\n", (unsigned) current_event.dwProcessId, (unsigned) current_event.dwThreadId); printf_unfiltered (" unknown event code %u\n", (unsigned) current_event.dwDebugEventCode); break; } if (!retval || saw_create != 1) { if (continue_status == -1) windows_resume (ops, minus_one_ptid, 0, 1); else CHECK (windows_continue (continue_status, -1)); } else { inferior_ptid = ptid_build (current_event.dwProcessId, 0, retval); current_thread = th ?: thread_rec (current_event.dwThreadId, TRUE); } out: return retval; } /* Wait for interesting events to occur in the target process. */ static ptid_t windows_wait (struct target_ops *ops, ptid_t ptid, struct target_waitstatus *ourstatus, int options) { int pid = -1; target_terminal_ours (); /* We loop when we get a non-standard exception rather than return with a SPURIOUS because resume can try and step or modify things, which needs a current_thread->h. But some of these exceptions mark the birth or death of threads, which mean that the current thread isn't necessarily what you think it is. */ while (1) { int retval; /* If the user presses Ctrl-c while the debugger is waiting for an event, he expects the debugger to interrupt his program and to get the prompt back. There are two possible situations: - The debugger and the program do not share the console, in which case the Ctrl-c event only reached the debugger. In that case, the ctrl_c handler will take care of interrupting the inferior. Note that this case is working starting with Windows XP. For Windows 2000, Ctrl-C should be pressed in the inferior console. - The debugger and the program share the same console, in which case both debugger and inferior will receive the Ctrl-c event. In that case the ctrl_c handler will ignore the event, as the Ctrl-c event generated inside the inferior will trigger the expected debug event. FIXME: brobecker/2008-05-20: If the inferior receives the signal first and the delay until GDB receives that signal is sufficiently long, GDB can sometimes receive the SIGINT after we have unblocked the CTRL+C handler. This would lead to the debugger stopping prematurely while handling the new-thread event that comes with the handling of the SIGINT inside the inferior, and then stop again immediately when the user tries to resume the execution in the inferior. This is a classic race that we should try to fix one day. */ SetConsoleCtrlHandler (&ctrl_c_handler, TRUE); retval = get_windows_debug_event (ops, pid, ourstatus); SetConsoleCtrlHandler (&ctrl_c_handler, FALSE); if (retval) return ptid_build (current_event.dwProcessId, 0, retval); else { int detach = 0; if (deprecated_ui_loop_hook != NULL) detach = deprecated_ui_loop_hook (0); if (detach) windows_kill_inferior (ops); } } } /* Iterate over all DLLs currently mapped by our inferior, and add them to our list of solibs. */ static void windows_add_all_dlls (void) { struct so_list *so; HMODULE dummy_hmodule; DWORD cb_needed; HMODULE *hmodules; int i; if (EnumProcessModules (current_process_handle, &dummy_hmodule, sizeof (HMODULE), &cb_needed) == 0) return; if (cb_needed < 1) return; hmodules = (HMODULE *) alloca (cb_needed); if (EnumProcessModules (current_process_handle, hmodules, cb_needed, &cb_needed) == 0) return; for (i = 1; i < (int) (cb_needed / sizeof (HMODULE)); i++) { MODULEINFO mi; #ifdef __USEWIDE wchar_t dll_name[__PMAX]; char name[__PMAX]; #else char dll_name[__PMAX]; char *name; #endif if (GetModuleInformation (current_process_handle, hmodules[i], &mi, sizeof (mi)) == 0) continue; if (GetModuleFileNameEx (current_process_handle, hmodules[i], dll_name, sizeof (dll_name)) == 0) continue; #ifdef __USEWIDE wcstombs (name, dll_name, __PMAX); #else name = dll_name; #endif solib_end->next = windows_make_so (name, mi.lpBaseOfDll); solib_end = solib_end->next; } } static void do_initial_windows_stuff (struct target_ops *ops, DWORD pid, int attaching) { extern int stop_after_trap; int i; struct inferior *inf; struct thread_info *tp; last_sig = GDB_SIGNAL_0; event_count = 0; exception_count = 0; open_process_used = 0; debug_registers_changed = 0; debug_registers_used = 0; for (i = 0; i < sizeof (dr) / sizeof (dr[0]); i++) dr[i] = 0; #ifdef __CYGWIN__ cygwin_load_start = cygwin_load_end = 0; #endif current_event.dwProcessId = pid; memset (¤t_event, 0, sizeof (current_event)); push_target (ops); disable_breakpoints_in_shlibs (); windows_clear_solib (); clear_proceed_status (); init_wait_for_inferior (); inf = current_inferior (); inferior_appeared (inf, pid); inf->attach_flag = attaching; /* Make the new process the current inferior, so terminal handling can rely on it. When attaching, we don't know about any thread id here, but that's OK --- nothing should be referencing the current thread until we report an event out of windows_wait. */ inferior_ptid = pid_to_ptid (pid); terminal_init_inferior_with_pgrp (pid); target_terminal_inferior (); windows_initialization_done = 0; inf->control.stop_soon = STOP_QUIETLY; while (1) { stop_after_trap = 1; wait_for_inferior (); tp = inferior_thread (); if (tp->suspend.stop_signal != GDB_SIGNAL_TRAP) resume (0, tp->suspend.stop_signal); else break; } /* Now that the inferior has been started and all DLLs have been mapped, we can iterate over all DLLs and load them in. We avoid doing it any earlier because, on certain versions of Windows, LOAD_DLL_DEBUG_EVENTs are sometimes not complete. In particular, we have seen on Windows 8.1 that the ntdll.dll load event does not include the DLL name, preventing us from creating an associated SO. A possible explanation is that ntdll.dll might be mapped before the SO info gets created by the Windows system -- ntdll.dll is the first DLL to be reported via LOAD_DLL_DEBUG_EVENT and other DLLs do not seem to suffer from that problem. Rather than try to work around this sort of issue, it is much simpler to just ignore DLL load/unload events during the startup phase, and then process them all in one batch now. */ windows_add_all_dlls (); windows_initialization_done = 1; inf->control.stop_soon = NO_STOP_QUIETLY; stop_after_trap = 0; return; } /* Try to set or remove a user privilege to the current process. Return -1 if that fails, the previous setting of that privilege otherwise. This code is copied from the Cygwin source code and rearranged to allow dynamically loading of the needed symbols from advapi32 which is only available on NT/2K/XP. */ static int set_process_privilege (const char *privilege, BOOL enable) { HANDLE token_hdl = NULL; LUID restore_priv; TOKEN_PRIVILEGES new_priv, orig_priv; int ret = -1; DWORD size; if (!OpenProcessToken (GetCurrentProcess (), TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES, &token_hdl)) goto out; if (!LookupPrivilegeValueA (NULL, privilege, &restore_priv)) goto out; new_priv.PrivilegeCount = 1; new_priv.Privileges[0].Luid = restore_priv; new_priv.Privileges[0].Attributes = enable ? SE_PRIVILEGE_ENABLED : 0; if (!AdjustTokenPrivileges (token_hdl, FALSE, &new_priv, sizeof orig_priv, &orig_priv, &size)) goto out; #if 0 /* Disabled, otherwise every `attach' in an unprivileged user session would raise the "Failed to get SE_DEBUG_NAME privilege" warning in windows_attach(). */ /* AdjustTokenPrivileges returns TRUE even if the privilege could not be enabled. GetLastError () returns an correct error code, though. */ if (enable && GetLastError () == ERROR_NOT_ALL_ASSIGNED) goto out; #endif ret = orig_priv.Privileges[0].Attributes == SE_PRIVILEGE_ENABLED ? 1 : 0; out: if (token_hdl) CloseHandle (token_hdl); return ret; } /* Attach to process PID, then initialize for debugging it. */ static void windows_attach (struct target_ops *ops, char *args, int from_tty) { BOOL ok; DWORD pid; pid = parse_pid_to_attach (args); if (set_process_privilege (SE_DEBUG_NAME, TRUE) < 0) { printf_unfiltered ("Warning: Failed to get SE_DEBUG_NAME privilege\n"); printf_unfiltered ("This can cause attach to " "fail on Windows NT/2K/XP\n"); } windows_init_thread_list (); ok = DebugActiveProcess (pid); saw_create = 0; #ifdef __CYGWIN__ if (!ok) { /* Try fall back to Cygwin pid. */ pid = cygwin_internal (CW_CYGWIN_PID_TO_WINPID, pid); if (pid > 0) ok = DebugActiveProcess (pid); } #endif if (!ok) error (_("Can't attach to process.")); DebugSetProcessKillOnExit (FALSE); if (from_tty) { char *exec_file = (char *) get_exec_file (0); if (exec_file) printf_unfiltered ("Attaching to program `%s', %s\n", exec_file, target_pid_to_str (pid_to_ptid (pid))); else printf_unfiltered ("Attaching to %s\n", target_pid_to_str (pid_to_ptid (pid))); gdb_flush (gdb_stdout); } do_initial_windows_stuff (ops, pid, 1); target_terminal_ours (); } static void windows_detach (struct target_ops *ops, const char *args, int from_tty) { int detached = 1; ptid_t ptid = {-1}; windows_resume (ops, ptid, 0, GDB_SIGNAL_0); if (!DebugActiveProcessStop (current_event.dwProcessId)) { error (_("Can't detach process %u (error %u)"), (unsigned) current_event.dwProcessId, (unsigned) GetLastError ()); detached = 0; } DebugSetProcessKillOnExit (FALSE); if (detached && from_tty) { char *exec_file = get_exec_file (0); if (exec_file == 0) exec_file = ""; printf_unfiltered ("Detaching from program: %s, Pid %u\n", exec_file, (unsigned) current_event.dwProcessId); gdb_flush (gdb_stdout); } i386_cleanup_dregs (); inferior_ptid = null_ptid; detach_inferior (current_event.dwProcessId); unpush_target (ops); } /* Try to determine the executable filename. EXE_NAME_RET is a pointer to a buffer whose size is EXE_NAME_MAX_LEN. Upon success, the filename is stored inside EXE_NAME_RET, and this function returns nonzero. Otherwise, this function returns zero and the contents of EXE_NAME_RET is undefined. */ static int windows_get_exec_module_filename (char *exe_name_ret, size_t exe_name_max_len) { DWORD len; HMODULE dh_buf; DWORD cbNeeded; cbNeeded = 0; if (!EnumProcessModules (current_process_handle, &dh_buf, sizeof (HMODULE), &cbNeeded) || !cbNeeded) return 0; /* We know the executable is always first in the list of modules, which we just fetched. So no need to fetch more. */ #ifdef __CYGWIN__ { /* Cygwin prefers that the path be in /x/y/z format, so extract the filename into a temporary buffer first, and then convert it to POSIX format into the destination buffer. */ cygwin_buf_t *pathbuf = alloca (exe_name_max_len * sizeof (cygwin_buf_t)); len = GetModuleFileNameEx (current_process_handle, dh_buf, pathbuf, exe_name_max_len); if (len == 0) error (_("Error getting executable filename: %u."), (unsigned) GetLastError ()); if (cygwin_conv_path (CCP_WIN_W_TO_POSIX, pathbuf, exe_name_ret, exe_name_max_len) < 0) error (_("Error converting executable filename to POSIX: %d."), errno); } #else len = GetModuleFileNameEx (current_process_handle, dh_buf, exe_name_ret, exe_name_max_len); if (len == 0) error (_("Error getting executable filename: %u."), (unsigned) GetLastError ()); #endif return 1; /* success */ } /* The pid_to_exec_file target_ops method for this platform. */ static char * windows_pid_to_exec_file (struct target_ops *self, int pid) { static char path[__PMAX]; #ifdef __CYGWIN__ /* Try to find exe name as symlink target of /proc//exe. */ int nchars; char procexe[sizeof ("/proc/4294967295/exe")]; xsnprintf (procexe, sizeof (procexe), "/proc/%u/exe", pid); nchars = readlink (procexe, path, sizeof(path)); if (nchars > 0 && nchars < sizeof (path)) { path[nchars] = '\0'; /* Got it */ return path; } #endif /* If we get here then either Cygwin is hosed, this isn't a Cygwin version of gdb, or we're trying to debug a non-Cygwin windows executable. */ if (!windows_get_exec_module_filename (path, sizeof (path))) path[0] = '\0'; return path; } /* Print status information about what we're accessing. */ static void windows_files_info (struct target_ops *ignore) { struct inferior *inf = current_inferior (); printf_unfiltered ("\tUsing the running image of %s %s.\n", inf->attach_flag ? "attached" : "child", target_pid_to_str (inferior_ptid)); } static void windows_open (char *arg, int from_tty) { error (_("Use the \"run\" command to start a Unix child process.")); } /* Modify CreateProcess parameters for use of a new separate console. Parameters are: *FLAGS: DWORD parameter for general process creation flags. *SI: STARTUPINFO structure, for which the console window size and console buffer size is filled in if GDB is running in a console. to create the new console. The size of the used font is not available on all versions of Windows OS. Furthermore, the current font might not be the default font, but this is still better than before. If the windows and buffer sizes are computed, SI->DWFLAGS is changed so that this information is used by CreateProcess function. */ static void windows_set_console_info (STARTUPINFO *si, DWORD *flags) { HANDLE hconsole = CreateFile ("CONOUT$", GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, 0); if (hconsole != INVALID_HANDLE_VALUE) { CONSOLE_SCREEN_BUFFER_INFO sbinfo; COORD font_size; CONSOLE_FONT_INFO cfi; GetCurrentConsoleFont (hconsole, FALSE, &cfi); font_size = GetConsoleFontSize (hconsole, cfi.nFont); GetConsoleScreenBufferInfo(hconsole, &sbinfo); si->dwXSize = sbinfo.srWindow.Right - sbinfo.srWindow.Left + 1; si->dwYSize = sbinfo.srWindow.Bottom - sbinfo.srWindow.Top + 1; if (font_size.X) si->dwXSize *= font_size.X; else si->dwXSize *= 8; if (font_size.Y) si->dwYSize *= font_size.Y; else si->dwYSize *= 12; si->dwXCountChars = sbinfo.dwSize.X; si->dwYCountChars = sbinfo.dwSize.Y; si->dwFlags |= STARTF_USESIZE | STARTF_USECOUNTCHARS; } *flags |= CREATE_NEW_CONSOLE; } #ifndef __CYGWIN__ /* Function called by qsort to sort environment strings. */ static int envvar_cmp (const void *a, const void *b) { const char **p = (const char **) a; const char **q = (const char **) b; return strcasecmp (*p, *q); } #endif #ifdef __CYGWIN__ static void clear_win32_environment (char **env) { int i; size_t len; wchar_t *copy = NULL, *equalpos; for (i = 0; env[i] && *env[i]; i++) { len = mbstowcs (NULL, env[i], 0) + 1; copy = (wchar_t *) xrealloc (copy, len * sizeof (wchar_t)); mbstowcs (copy, env[i], len); equalpos = wcschr (copy, L'='); if (equalpos) *equalpos = L'\0'; SetEnvironmentVariableW (copy, NULL); } xfree (copy); } #endif /* Start an inferior windows child process and sets inferior_ptid to its pid. EXEC_FILE is the file to run. ALLARGS is a string containing the arguments to the program. ENV is the environment vector to pass. Errors reported with error(). */ static void windows_create_inferior (struct target_ops *ops, char *exec_file, char *allargs, char **in_env, int from_tty) { STARTUPINFO si; #ifdef __CYGWIN__ cygwin_buf_t real_path[__PMAX]; cygwin_buf_t shell[__PMAX]; /* Path to shell */ const char *sh; cygwin_buf_t *toexec; cygwin_buf_t *cygallargs; cygwin_buf_t *args; char **old_env = NULL; PWCHAR w32_env; size_t len; int tty; int ostdin, ostdout, ostderr; #else char real_path[__PMAX]; char shell[__PMAX]; /* Path to shell */ char *toexec; char *args; size_t args_len; HANDLE tty; char *w32env; char *temp; size_t envlen; int i; size_t envsize; char **env; #endif PROCESS_INFORMATION pi; BOOL ret; DWORD flags = 0; const char *inferior_io_terminal = get_inferior_io_terminal (); if (!exec_file) error (_("No executable specified, use `target exec'.")); memset (&si, 0, sizeof (si)); si.cb = sizeof (si); if (new_group) flags |= CREATE_NEW_PROCESS_GROUP; if (new_console) windows_set_console_info (&si, &flags); #ifdef __CYGWIN__ if (!useshell) { flags |= DEBUG_ONLY_THIS_PROCESS; if (cygwin_conv_path (CCP_POSIX_TO_WIN_W, exec_file, real_path, __PMAX * sizeof (cygwin_buf_t)) < 0) error (_("Error starting executable: %d"), errno); toexec = real_path; #ifdef __USEWIDE len = mbstowcs (NULL, allargs, 0) + 1; if (len == (size_t) -1) error (_("Error starting executable: %d"), errno); cygallargs = (wchar_t *) alloca (len * sizeof (wchar_t)); mbstowcs (cygallargs, allargs, len); #else cygallargs = allargs; #endif } else { sh = getenv ("SHELL"); if (!sh) sh = "/bin/sh"; if (cygwin_conv_path (CCP_POSIX_TO_WIN_W, sh, shell, __PMAX) < 0) error (_("Error starting executable via shell: %d"), errno); #ifdef __USEWIDE len = sizeof (L" -c 'exec '") + mbstowcs (NULL, exec_file, 0) + mbstowcs (NULL, allargs, 0) + 2; cygallargs = (wchar_t *) alloca (len * sizeof (wchar_t)); swprintf (cygallargs, len, L" -c 'exec %s %s'", exec_file, allargs); #else len = (sizeof (" -c 'exec '") + strlen (exec_file) + strlen (allargs) + 2); cygallargs = (char *) alloca (len); xsnprintf (cygallargs, len, " -c 'exec %s %s'", exec_file, allargs); #endif toexec = shell; flags |= DEBUG_PROCESS; } #ifdef __USEWIDE args = (cygwin_buf_t *) alloca ((wcslen (toexec) + wcslen (cygallargs) + 2) * sizeof (wchar_t)); wcscpy (args, toexec); wcscat (args, L" "); wcscat (args, cygallargs); #else args = (cygwin_buf_t *) alloca (strlen (toexec) + strlen (cygallargs) + 2); strcpy (args, toexec); strcat (args, " "); strcat (args, cygallargs); #endif #ifdef CW_CVT_ENV_TO_WINENV /* First try to create a direct Win32 copy of the POSIX environment. */ w32_env = (PWCHAR) cygwin_internal (CW_CVT_ENV_TO_WINENV, in_env); if (w32_env != (PWCHAR) -1) flags |= CREATE_UNICODE_ENVIRONMENT; else /* If that fails, fall back to old method tweaking GDB's environment. */ #endif { /* Reset all Win32 environment variables to avoid leftover on next run. */ clear_win32_environment (environ); /* Prepare the environment vars for CreateProcess. */ old_env = environ; environ = in_env; cygwin_internal (CW_SYNC_WINENV); w32_env = NULL; } if (!inferior_io_terminal) tty = ostdin = ostdout = ostderr = -1; else { tty = open (inferior_io_terminal, O_RDWR | O_NOCTTY); if (tty < 0) { print_sys_errmsg (inferior_io_terminal, errno); ostdin = ostdout = ostderr = -1; } else { ostdin = dup (0); ostdout = dup (1); ostderr = dup (2); dup2 (tty, 0); dup2 (tty, 1); dup2 (tty, 2); } } windows_init_thread_list (); ret = CreateProcess (0, args, /* command line */ NULL, /* Security */ NULL, /* thread */ TRUE, /* inherit handles */ flags, /* start flags */ w32_env, /* environment */ NULL, /* current directory */ &si, &pi); if (w32_env) /* Just free the Win32 environment, if it could be created. */ free (w32_env); else { /* Reset all environment variables to avoid leftover on next run. */ clear_win32_environment (in_env); /* Restore normal GDB environment variables. */ environ = old_env; cygwin_internal (CW_SYNC_WINENV); } if (tty >= 0) { close (tty); dup2 (ostdin, 0); dup2 (ostdout, 1); dup2 (ostderr, 2); close (ostdin); close (ostdout); close (ostderr); } #else toexec = exec_file; /* Build the command line, a space-separated list of tokens where the first token is the name of the module to be executed. To avoid ambiguities introduced by spaces in the module name, we quote it. */ args_len = strlen (toexec) + 2 /* quotes */ + strlen (allargs) + 2; args = alloca (args_len); xsnprintf (args, args_len, "\"%s\" %s", toexec, allargs); flags |= DEBUG_ONLY_THIS_PROCESS; if (!inferior_io_terminal) tty = INVALID_HANDLE_VALUE; else { SECURITY_ATTRIBUTES sa; sa.nLength = sizeof(sa); sa.lpSecurityDescriptor = 0; sa.bInheritHandle = TRUE; tty = CreateFileA (inferior_io_terminal, GENERIC_READ | GENERIC_WRITE, 0, &sa, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0); if (tty == INVALID_HANDLE_VALUE) warning (_("Warning: Failed to open TTY %s, error %#x."), inferior_io_terminal, (unsigned) GetLastError ()); else { si.hStdInput = tty; si.hStdOutput = tty; si.hStdError = tty; si.dwFlags |= STARTF_USESTDHANDLES; } } /* CreateProcess takes the environment list as a null terminated set of strings (i.e. two nulls terminate the list). */ /* Get total size for env strings. */ for (envlen = 0, i = 0; in_env[i] && *in_env[i]; i++) envlen += strlen (in_env[i]) + 1; envsize = sizeof (in_env[0]) * (i + 1); env = (char **) alloca (envsize); memcpy (env, in_env, envsize); /* Windows programs expect the environment block to be sorted. */ qsort (env, i, sizeof (char *), envvar_cmp); w32env = alloca (envlen + 1); /* Copy env strings into new buffer. */ for (temp = w32env, i = 0; env[i] && *env[i]; i++) { strcpy (temp, env[i]); temp += strlen (temp) + 1; } /* Final nil string to terminate new env. */ *temp = 0; windows_init_thread_list (); ret = CreateProcessA (0, args, /* command line */ NULL, /* Security */ NULL, /* thread */ TRUE, /* inherit handles */ flags, /* start flags */ w32env, /* environment */ NULL, /* current directory */ &si, &pi); if (tty != INVALID_HANDLE_VALUE) CloseHandle (tty); #endif if (!ret) error (_("Error creating process %s, (error %u)."), exec_file, (unsigned) GetLastError ()); CloseHandle (pi.hThread); CloseHandle (pi.hProcess); if (useshell && shell[0] != '\0') saw_create = -1; else saw_create = 0; do_initial_windows_stuff (ops, pi.dwProcessId, 0); /* windows_continue (DBG_CONTINUE, -1); */ } static void windows_mourn_inferior (struct target_ops *ops) { (void) windows_continue (DBG_CONTINUE, -1); i386_cleanup_dregs(); if (open_process_used) { CHECK (CloseHandle (current_process_handle)); open_process_used = 0; } unpush_target (ops); generic_mourn_inferior (); } /* Send a SIGINT to the process group. This acts just like the user typed a ^C on the controlling terminal. */ static void windows_stop (struct target_ops *self, ptid_t ptid) { DEBUG_EVENTS (("gdb: GenerateConsoleCtrlEvent (CTRLC_EVENT, 0)\n")); CHECK (GenerateConsoleCtrlEvent (CTRL_C_EVENT, current_event.dwProcessId)); registers_changed (); /* refresh register state */ } /* Helper for windows_xfer_partial that handles memory transfers. Arguments are like target_xfer_partial. */ static enum target_xfer_status windows_xfer_memory (gdb_byte *readbuf, const gdb_byte *writebuf, ULONGEST memaddr, ULONGEST len, ULONGEST *xfered_len) { SIZE_T done = 0; BOOL success; DWORD lasterror = 0; if (writebuf != NULL) { DEBUG_MEM (("gdb: write target memory, %s bytes at %s\n", pulongest (len), core_addr_to_string (memaddr))); success = WriteProcessMemory (current_process_handle, (LPVOID) (uintptr_t) memaddr, writebuf, len, &done); if (!success) lasterror = GetLastError (); FlushInstructionCache (current_process_handle, (LPCVOID) (uintptr_t) memaddr, len); } else { DEBUG_MEM (("gdb: read target memory, %s bytes at %s\n", pulongest (len), core_addr_to_string (memaddr))); success = ReadProcessMemory (current_process_handle, (LPCVOID) (uintptr_t) memaddr, readbuf, len, &done); if (!success) lasterror = GetLastError (); } *xfered_len = (ULONGEST) done; if (!success && lasterror == ERROR_PARTIAL_COPY && done > 0) return TARGET_XFER_OK; else return success ? TARGET_XFER_OK : TARGET_XFER_E_IO; } static void windows_kill_inferior (struct target_ops *ops) { CHECK (TerminateProcess (current_process_handle, 0)); for (;;) { if (!windows_continue (DBG_CONTINUE, -1)) break; if (!WaitForDebugEvent (¤t_event, INFINITE)) break; if (current_event.dwDebugEventCode == EXIT_PROCESS_DEBUG_EVENT) break; } target_mourn_inferior (); /* Or just windows_mourn_inferior? */ } static void windows_prepare_to_store (struct target_ops *self, struct regcache *regcache) { /* Do nothing, since we can store individual regs. */ } static int windows_can_run (struct target_ops *self) { return 1; } static void windows_close (struct target_ops *self) { DEBUG_EVENTS (("gdb: windows_close, inferior_ptid=%d\n", ptid_get_pid (inferior_ptid))); } /* Convert pid to printable format. */ static char * windows_pid_to_str (struct target_ops *ops, ptid_t ptid) { static char buf[80]; if (ptid_get_tid (ptid) != 0) { snprintf (buf, sizeof (buf), "Thread %d.0x%lx", ptid_get_pid (ptid), ptid_get_tid (ptid)); return buf; } return normal_pid_to_str (ptid); } static enum target_xfer_status windows_xfer_shared_libraries (struct target_ops *ops, enum target_object object, const char *annex, gdb_byte *readbuf, const gdb_byte *writebuf, ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) { struct obstack obstack; const char *buf; LONGEST len_avail; struct so_list *so; if (writebuf) return TARGET_XFER_E_IO; obstack_init (&obstack); obstack_grow_str (&obstack, "\n"); for (so = solib_start.next; so; so = so->next) windows_xfer_shared_library (so->so_name, (CORE_ADDR) (uintptr_t) so->lm_info->load_addr, target_gdbarch (), &obstack); obstack_grow_str0 (&obstack, "\n"); buf = obstack_finish (&obstack); len_avail = strlen (buf); if (offset >= len_avail) len= 0; else { if (len > len_avail - offset) len = len_avail - offset; memcpy (readbuf, buf + offset, len); } obstack_free (&obstack, NULL); *xfered_len = (ULONGEST) len; return len != 0 ? TARGET_XFER_OK : TARGET_XFER_EOF; } static enum target_xfer_status windows_xfer_partial (struct target_ops *ops, enum target_object object, const char *annex, gdb_byte *readbuf, const gdb_byte *writebuf, ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) { switch (object) { case TARGET_OBJECT_MEMORY: return windows_xfer_memory (readbuf, writebuf, offset, len, xfered_len); case TARGET_OBJECT_LIBRARIES: return windows_xfer_shared_libraries (ops, object, annex, readbuf, writebuf, offset, len, xfered_len); default: if (ops->beneath != NULL) return ops->beneath->to_xfer_partial (ops->beneath, object, annex, readbuf, writebuf, offset, len, xfered_len); return TARGET_XFER_E_IO; } } /* Provide thread local base, i.e. Thread Information Block address. Returns 1 if ptid is found and sets *ADDR to thread_local_base. */ static int windows_get_tib_address (struct target_ops *self, ptid_t ptid, CORE_ADDR *addr) { thread_info *th; th = thread_rec (ptid_get_tid (ptid), 0); if (th == NULL) return 0; if (addr != NULL) *addr = th->thread_local_base; return 1; } static ptid_t windows_get_ada_task_ptid (struct target_ops *self, long lwp, long thread) { return ptid_build (ptid_get_pid (inferior_ptid), 0, lwp); } static void init_windows_ops (void) { windows_ops.to_shortname = "child"; windows_ops.to_longname = "Win32 child process"; windows_ops.to_doc = "Win32 child process (started by the \"run\" command)."; windows_ops.to_open = windows_open; windows_ops.to_close = windows_close; windows_ops.to_attach = windows_attach; windows_ops.to_attach_no_wait = 1; windows_ops.to_detach = windows_detach; windows_ops.to_resume = windows_resume; windows_ops.to_wait = windows_wait; windows_ops.to_fetch_registers = windows_fetch_inferior_registers; windows_ops.to_store_registers = windows_store_inferior_registers; windows_ops.to_prepare_to_store = windows_prepare_to_store; windows_ops.to_xfer_partial = windows_xfer_partial; windows_ops.to_files_info = windows_files_info; windows_ops.to_insert_breakpoint = memory_insert_breakpoint; windows_ops.to_remove_breakpoint = memory_remove_breakpoint; windows_ops.to_terminal_init = terminal_init_inferior; windows_ops.to_terminal_inferior = terminal_inferior; windows_ops.to_terminal_ours_for_output = terminal_ours_for_output; windows_ops.to_terminal_ours = terminal_ours; windows_ops.to_terminal_save_ours = terminal_save_ours; windows_ops.to_terminal_info = child_terminal_info; windows_ops.to_kill = windows_kill_inferior; windows_ops.to_create_inferior = windows_create_inferior; windows_ops.to_mourn_inferior = windows_mourn_inferior; windows_ops.to_can_run = windows_can_run; windows_ops.to_thread_alive = windows_thread_alive; windows_ops.to_pid_to_str = windows_pid_to_str; windows_ops.to_stop = windows_stop; windows_ops.to_stratum = process_stratum; windows_ops.to_has_all_memory = default_child_has_all_memory; windows_ops.to_has_memory = default_child_has_memory; windows_ops.to_has_stack = default_child_has_stack; windows_ops.to_has_registers = default_child_has_registers; windows_ops.to_has_execution = default_child_has_execution; windows_ops.to_pid_to_exec_file = windows_pid_to_exec_file; windows_ops.to_get_ada_task_ptid = windows_get_ada_task_ptid; windows_ops.to_get_tib_address = windows_get_tib_address; i386_use_watchpoints (&windows_ops); i386_dr_low.set_control = cygwin_set_dr7; i386_dr_low.set_addr = cygwin_set_dr; i386_dr_low.get_addr = cygwin_get_dr; i386_dr_low.get_status = cygwin_get_dr6; i386_dr_low.get_control = cygwin_get_dr7; /* i386_dr_low.debug_register_length field is set by calling i386_set_debug_register_length function in processor windows specific native file. */ windows_ops.to_magic = OPS_MAGIC; } static void set_windows_aliases (char *argv0) { add_info_alias ("dll", "sharedlibrary", 1); } /* -Wmissing-prototypes */ extern initialize_file_ftype _initialize_windows_nat; void _initialize_windows_nat (void) { struct cmd_list_element *c; init_windows_ops (); #ifdef __CYGWIN__ cygwin_internal (CW_SET_DOS_FILE_WARNING, 0); #endif c = add_com ("dll-symbols", class_files, dll_symbol_command, _("Load dll library symbols from FILE.")); set_cmd_completer (c, filename_completer); deprecate_cmd (c, "sharedlibrary"); c = add_com ("add-shared-symbol-files", class_files, dll_symbol_command, _("Load dll library symbols from FILE.")); set_cmd_completer (c, filename_completer); deprecate_cmd (c, "sharedlibrary"); c = add_com ("assf", class_files, dll_symbol_command, _("Load dll library symbols from FILE.")); set_cmd_completer (c, filename_completer); deprecate_cmd (c, "sharedlibrary"); #ifdef __CYGWIN__ add_setshow_boolean_cmd ("shell", class_support, &useshell, _("\ Set use of shell to start subprocess."), _("\ Show use of shell to start subprocess."), NULL, NULL, NULL, /* FIXME: i18n: */ &setlist, &showlist); add_setshow_boolean_cmd ("cygwin-exceptions", class_support, &cygwin_exceptions, _("\ Break when an exception is detected in the Cygwin DLL itself."), _("\ Show whether gdb breaks on exceptions in the Cygwin DLL itself."), NULL, NULL, NULL, /* FIXME: i18n: */ &setlist, &showlist); #endif add_setshow_boolean_cmd ("new-console", class_support, &new_console, _("\ Set creation of new console when creating child process."), _("\ Show creation of new console when creating child process."), NULL, NULL, NULL, /* FIXME: i18n: */ &setlist, &showlist); add_setshow_boolean_cmd ("new-group", class_support, &new_group, _("\ Set creation of new group when creating child process."), _("\ Show creation of new group when creating child process."), NULL, NULL, NULL, /* FIXME: i18n: */ &setlist, &showlist); add_setshow_boolean_cmd ("debugexec", class_support, &debug_exec, _("\ Set whether to display execution in child process."), _("\ Show whether to display execution in child process."), NULL, NULL, NULL, /* FIXME: i18n: */ &setlist, &showlist); add_setshow_boolean_cmd ("debugevents", class_support, &debug_events, _("\ Set whether to display kernel events in child process."), _("\ Show whether to display kernel events in child process."), NULL, NULL, NULL, /* FIXME: i18n: */ &setlist, &showlist); add_setshow_boolean_cmd ("debugmemory", class_support, &debug_memory, _("\ Set whether to display memory accesses in child process."), _("\ Show whether to display memory accesses in child process."), NULL, NULL, NULL, /* FIXME: i18n: */ &setlist, &showlist); add_setshow_boolean_cmd ("debugexceptions", class_support, &debug_exceptions, _("\ Set whether to display kernel exceptions in child process."), _("\ Show whether to display kernel exceptions in child process."), NULL, NULL, NULL, /* FIXME: i18n: */ &setlist, &showlist); init_w32_command_list (); add_cmd ("selector", class_info, display_selectors, _("Display selectors infos."), &info_w32_cmdlist); add_target (&windows_ops); deprecated_init_ui_hook = set_windows_aliases; } /* Hardware watchpoint support, adapted from go32-nat.c code. */ /* Pass the address ADDR to the inferior in the I'th debug register. Here we just store the address in dr array, the registers will be actually set up when windows_continue is called. */ static void cygwin_set_dr (int i, CORE_ADDR addr) { if (i < 0 || i > 3) internal_error (__FILE__, __LINE__, _("Invalid register %d in cygwin_set_dr.\n"), i); dr[i] = addr; debug_registers_changed = 1; debug_registers_used = 1; } /* Pass the value VAL to the inferior in the DR7 debug control register. Here we just store the address in D_REGS, the watchpoint will be actually set up in windows_wait. */ static void cygwin_set_dr7 (unsigned long val) { dr[7] = (CORE_ADDR) val; debug_registers_changed = 1; debug_registers_used = 1; } /* Get the value of debug register I from the inferior. */ static CORE_ADDR cygwin_get_dr (int i) { return dr[i]; } /* Get the value of the DR6 debug status register from the inferior. Here we just return the value stored in dr[6] by the last call to thread_rec for current_event.dwThreadId id. */ static unsigned long cygwin_get_dr6 (void) { return (unsigned long) dr[6]; } /* Get the value of the DR7 debug status register from the inferior. Here we just return the value stored in dr[7] by the last call to thread_rec for current_event.dwThreadId id. */ static unsigned long cygwin_get_dr7 (void) { return (unsigned long) dr[7]; } /* Determine if the thread referenced by "ptid" is alive by "polling" it. If WaitForSingleObject returns WAIT_OBJECT_0 it means that the thread has died. Otherwise it is assumed to be alive. */ static int windows_thread_alive (struct target_ops *ops, ptid_t ptid) { int tid; gdb_assert (ptid_get_tid (ptid) != 0); tid = ptid_get_tid (ptid); return WaitForSingleObject (thread_rec (tid, FALSE)->h, 0) == WAIT_OBJECT_0 ? FALSE : TRUE; } /* -Wmissing-prototypes */ extern initialize_file_ftype _initialize_check_for_gdb_ini; void _initialize_check_for_gdb_ini (void) { char *homedir; if (inhibit_gdbinit) return; homedir = getenv ("HOME"); if (homedir) { char *p; char *oldini = (char *) alloca (strlen (homedir) + sizeof ("/gdb.ini")); strcpy (oldini, homedir); p = strchr (oldini, '\0'); if (p > oldini && !IS_DIR_SEPARATOR (p[-1])) *p++ = '/'; strcpy (p, "gdb.ini"); if (access (oldini, 0) == 0) { int len = strlen (oldini); char *newini = alloca (len + 1); xsnprintf (newini, len + 1, "%.*s.gdbinit", (int) (len - (sizeof ("gdb.ini") - 1)), oldini); warning (_("obsolete '%s' found. Rename to '%s'."), oldini, newini); } } } /* Define dummy functions which always return error for the rare cases where these functions could not be found. */ static BOOL WINAPI bad_DebugActiveProcessStop (DWORD w) { return FALSE; } static BOOL WINAPI bad_DebugBreakProcess (HANDLE w) { return FALSE; } static BOOL WINAPI bad_DebugSetProcessKillOnExit (BOOL w) { return FALSE; } static BOOL WINAPI bad_EnumProcessModules (HANDLE w, HMODULE *x, DWORD y, LPDWORD z) { return FALSE; } #ifdef __USEWIDE static DWORD WINAPI bad_GetModuleFileNameExW (HANDLE w, HMODULE x, LPWSTR y, DWORD z) { return 0; } #else static DWORD WINAPI bad_GetModuleFileNameExA (HANDLE w, HMODULE x, LPSTR y, DWORD z) { return 0; } #endif static BOOL WINAPI bad_GetModuleInformation (HANDLE w, HMODULE x, LPMODULEINFO y, DWORD z) { return FALSE; } static BOOL WINAPI bad_OpenProcessToken (HANDLE w, DWORD x, PHANDLE y) { return FALSE; } static BOOL WINAPI bad_GetCurrentConsoleFont (HANDLE w, BOOL bMaxWindow, CONSOLE_FONT_INFO *f) { f->nFont = 0; return 1; } static COORD WINAPI bad_GetConsoleFontSize (HANDLE w, DWORD nFont) { COORD size; size.X = 8; size.Y = 12; return size; } /* -Wmissing-prototypes */ extern initialize_file_ftype _initialize_loadable; /* Load any functions which may not be available in ancient versions of Windows. */ void _initialize_loadable (void) { HMODULE hm = NULL; hm = LoadLibrary ("kernel32.dll"); if (hm) { DebugActiveProcessStop = (void *) GetProcAddress (hm, "DebugActiveProcessStop"); DebugBreakProcess = (void *) GetProcAddress (hm, "DebugBreakProcess"); DebugSetProcessKillOnExit = (void *) GetProcAddress (hm, "DebugSetProcessKillOnExit"); GetConsoleFontSize = (void *) GetProcAddress (hm, "GetConsoleFontSize"); GetCurrentConsoleFont = (void *) GetProcAddress (hm, "GetCurrentConsoleFont"); } /* Set variables to dummy versions of these processes if the function wasn't found in kernel32.dll. */ if (!DebugBreakProcess) DebugBreakProcess = bad_DebugBreakProcess; if (!DebugActiveProcessStop || !DebugSetProcessKillOnExit) { DebugActiveProcessStop = bad_DebugActiveProcessStop; DebugSetProcessKillOnExit = bad_DebugSetProcessKillOnExit; } if (!GetConsoleFontSize) GetConsoleFontSize = bad_GetConsoleFontSize; if (!GetCurrentConsoleFont) GetCurrentConsoleFont = bad_GetCurrentConsoleFont; /* Load optional functions used for retrieving filename information associated with the currently debugged process or its dlls. */ hm = LoadLibrary ("psapi.dll"); if (hm) { EnumProcessModules = (void *) GetProcAddress (hm, "EnumProcessModules"); GetModuleInformation = (void *) GetProcAddress (hm, "GetModuleInformation"); GetModuleFileNameEx = (void *) GetProcAddress (hm, GetModuleFileNameEx_name); } if (!EnumProcessModules || !GetModuleInformation || !GetModuleFileNameEx) { /* Set variables to dummy versions of these processes if the function wasn't found in psapi.dll. */ EnumProcessModules = bad_EnumProcessModules; GetModuleInformation = bad_GetModuleInformation; GetModuleFileNameEx = bad_GetModuleFileNameEx; /* This will probably fail on Windows 9x/Me. Let the user know that we're missing some functionality. */ warning(_("\ cannot automatically find executable file or library to read symbols.\n\ Use \"file\" or \"dll\" command to load executable/libraries directly.")); } hm = LoadLibrary ("advapi32.dll"); if (hm) { OpenProcessToken = (void *) GetProcAddress (hm, "OpenProcessToken"); LookupPrivilegeValueA = (void *) GetProcAddress (hm, "LookupPrivilegeValueA"); AdjustTokenPrivileges = (void *) GetProcAddress (hm, "AdjustTokenPrivileges"); /* Only need to set one of these since if OpenProcessToken fails nothing else is needed. */ if (!OpenProcessToken || !LookupPrivilegeValueA || !AdjustTokenPrivileges) OpenProcessToken = bad_OpenProcessToken; } }