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binutils-gdb/gdb/gdbserver/win32-low.c

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/* Low level interface to Windows debugging, for gdbserver.
Copyright (C) 2006, 2007 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 "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 HANDLE current_process_handle = NULL;
static DWORD current_process_id = 0;
static enum target_signal last_sig = TARGET_SIGNAL_0;
/* The current debug event from WaitForDebugEvent. */
static DEBUG_EVENT current_event;
#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 DWORD main_thread_id = 0;
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;
}
/* 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 (!th->suspend_count && get_context)
{
if (id != current_event.dwThreadId)
th->suspend_count = SuspendThread (th->h) + 1;
(*the_low_target.get_thread_context) (th, &current_event);
}
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 = (win32_thread_info *) malloc (sizeof (*th));
memset (th, 0, 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 (DWORD pid)
{
last_sig = TARGET_SIGNAL_0;
memset (&current_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);
int i;
if ((thread_id == -1 || thread_id == th->tid)
&& th->suspend_count)
{
if (th->context.ContextFlags)
{
(*the_low_target.set_thread_context) (th, &current_event);
th->context.ContextFlags = 0;
}
for (i = 0; i < th->suspend_count; i++)
(void) ResumeThread (th->h);
th->suspend_count = 0;
}
return 0;
}
static BOOL
child_continue (DWORD continue_status, int thread_id)
{
BOOL res;
res = ContinueDebugEvent (current_event.dwProcessId,
current_event.dwThreadId, continue_status);
if (res)
find_inferior (&all_threads, continue_one_thread, &thread_id);
return res;
}
/* 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;
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
current_process_handle = pi.hProcess;
current_process_id = pi.dwProcessId;
do_initial_child_stuff (current_process_id);
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)
{
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 (DebugActiveProcess (pid))
{
if (DebugSetProcessKillOnExit != NULL)
DebugSetProcessKillOnExit (FALSE);
current_process_handle = OpenProcess (PROCESS_ALL_ACCESS, FALSE, pid);
if (current_process_handle != NULL)
{
current_process_id = pid;
do_initial_child_stuff (pid);
return 0;
}
if (DebugActiveProcessStop != NULL)
DebugActiveProcessStop (current_process_id);
}
error ("Attach to process failed.");
}
/* 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
}
/* Kill all inferiors. */
static void
win32_kill (void)
{
win32_thread_info *current_thread;
if (current_process_handle == NULL)
return;
TerminateProcess (current_process_handle, 0);
for (;;)
{
if (!child_continue (DBG_CONTINUE, -1))
break;
if (!WaitForDebugEvent (&current_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);
}
}
CloseHandle (current_process_handle);
current_thread = inferior_target_data (current_inferior);
if (current_thread && current_thread->h)
{
/* This may fail in an attached process, so don't check. */
(void) CloseHandle (current_thread->h);
}
}
/* Detach from all inferiors. */
static int
win32_detach (void)
{
HANDLE h;
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;
/* We need a new handle, since DebugActiveProcessStop
closes all the ones that came through the events. */
if ((h = OpenProcess (PROCESS_ALL_ACCESS,
FALSE,
current_process_id)) == NULL)
{
/* The process died. */
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))
{
CloseHandle (h);
return -1;
}
DebugSetProcessKillOnExit (FALSE);
current_process_handle = h;
return 0;
}
/* Wait for inferiors to end. */
static void
win32_join (void)
{
if (current_process_id == 0
|| current_process_handle == NULL)
return;
WaitForSingleObject (current_process_handle, INFINITE);
CloseHandle (current_process_handle);
current_process_handle = NULL;
current_process_id = 0;
}
/* 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");
}
(*the_low_target.set_thread_context) (th, &current_event);
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 = &current_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;
}
/* Get the next event from the child. */
static void
get_child_debug_event (struct target_waitstatus *ourstatus)
{
BOOL debug_event;
last_sig = TARGET_SIGNAL_0;
ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
/* Keep the wait time low enough for confortable remote interruption,
but high enough so gdbserver doesn't become a bottleneck. */
if (!(debug_event = WaitForDebugEvent (&current_event, 250)))
return;
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
/* 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,
delete_breakpoint_at);
#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);
}
/* 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)
{
/* Check if GDB sent us an interrupt request. */
check_remote_input_interrupt_request ();
get_child_debug_event (&our_status);
switch (our_status.kind)
{
case TARGET_WAITKIND_EXITED:
OUTMSG2 (("Child exited with retcode = %x\n",
our_status.value.integer));
*status = 'W';
child_fetch_inferior_registers (-1);
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;
OUTMSG (("Could not interrupt process.\n"));
}
static const char *
win32_arch_string (void)
{
return the_low_target.arch_string;
}
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
};
/* 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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