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binutils-gdb/gdbserver/win32-low.cc
Hannes Domani 99bb393f1d Handle 64bit breakpoints of WOW64 processes as SIGINT 
When a WOW64 process triggers a breakpoint exception in 64bit code (which
happens when a 64bit gdb calls DebugBreakProcess for a 32bit target),
gdb ignores the breakpoint (because Wow64GetThreadContext can only report
the pc of 32bit code, and there is not int3 at this location).

But if these 64bit breakpoint exceptions are handled as SIGINT, gdb
doesn't check for int3, and always stops the target.

gdb/ChangeLog:

2020-09-23  Hannes Domani  <ssbssa@yahoo.de>

	* nat/windows-nat.c (handle_exception): Handle 64bit breakpoints
	in WOW64 processes as SIGINT.
	* nat/windows-nat.h: Make wow64_process a shared variable.
	* windows-nat.c: Remove static wow64_process variable.

gdbserver/ChangeLog:

2020-09-23  Hannes Domani  <ssbssa@yahoo.de>

	* win32-low.cc: Remove local wow64_process variable.
	* win32-low.h: Remove local wow64_process variable.
2020-09-24 19:01:22 +02:00

1917 lines
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/* Low level interface to Windows debugging, for gdbserver.
Copyright (C) 2006-2020 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/fileio.h"
#include "mem-break.h"
#include "win32-low.h"
#include "gdbthread.h"
#include "dll.h"
#include "hostio.h"
#include <windows.h>
#include <winnt.h>
#include <imagehlp.h>
#include <tlhelp32.h>
#include <psapi.h>
#include <process.h>
#include "gdbsupport/gdb_tilde_expand.h"
#include "gdbsupport/common-inferior.h"
#include "gdbsupport/gdb_wait.h"
using namespace windows_nat;
#ifndef USE_WIN32API
#include <sys/cygwin.h>
#endif
#define OUTMSG(X) do { printf X; fflush (stderr); } while (0)
#define OUTMSG2(X) \
do \
{ \
if (debug_threads) \
{ \
printf X; \
fflush (stderr); \
} \
} while (0)
#ifndef _T
#define _T(x) TEXT (x)
#endif
#ifndef COUNTOF
#define COUNTOF(STR) (sizeof (STR) / sizeof ((STR)[0]))
#endif
#ifdef _WIN32_WCE
# define GETPROCADDRESS(DLL, PROC) \
((winapi_ ## PROC) GetProcAddress (DLL, TEXT (#PROC)))
#else
# define GETPROCADDRESS(DLL, PROC) \
((winapi_ ## PROC) GetProcAddress (DLL, #PROC))
#endif
int using_threads = 1;
/* Globals. */
static int attaching = 0;
/* A status that hasn't been reported to the core yet, and so
win32_wait should return it next, instead of fetching the next
debug event off the win32 API. */
static struct target_waitstatus cached_status;
/* Non zero if an interrupt request is to be satisfied by suspending
all threads. */
static int soft_interrupt_requested = 0;
/* Non zero if the inferior is stopped in a simulated breakpoint done
by suspending all the threads. */
static int faked_breakpoint = 0;
/* True if current_process_handle needs to be closed. */
static bool open_process_used = false;
const struct target_desc *win32_tdesc;
#ifdef __x86_64__
const struct target_desc *wow64_win32_tdesc;
#endif
#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);
#ifdef __x86_64__
typedef BOOL (WINAPI *winapi_Wow64SetThreadContext) (HANDLE,
const WOW64_CONTEXT *);
winapi_Wow64GetThreadContext win32_Wow64GetThreadContext;
static winapi_Wow64SetThreadContext win32_Wow64SetThreadContext;
#endif
#ifndef _WIN32_WCE
static void win32_add_all_dlls (void);
#endif
/* Get the thread ID from the current selected inferior (the current
thread). */
static ptid_t
current_thread_ptid (void)
{
return current_ptid;
}
/* The current debug event from WaitForDebugEvent. */
static ptid_t
debug_event_ptid (DEBUG_EVENT *event)
{
return ptid_t (event->dwProcessId, event->dwThreadId, 0);
}
/* Get the thread context of the thread associated with TH. */
static void
win32_get_thread_context (windows_thread_info *th)
{
#ifdef __x86_64__
if (wow64_process)
memset (&th->wow64_context, 0, sizeof (WOW64_CONTEXT));
else
#endif
memset (&th->context, 0, sizeof (CONTEXT));
(*the_low_target.get_thread_context) (th);
#ifdef _WIN32_WCE
memcpy (&th->base_context, &th->context, sizeof (CONTEXT));
#endif
}
/* Set the thread context of the thread associated with TH. */
static void
win32_set_thread_context (windows_thread_info *th)
{
#ifdef _WIN32_WCE
/* Calling SuspendThread on a thread that is running kernel code
will report that the suspending was successful, but in fact, that
will often not be true. In those cases, the context returned by
GetThreadContext will not be correct by the time the thread
stops, hence we can't set that context back into the thread when
resuming - it will most likely crash the inferior.
Unfortunately, there is no way to know when the thread will
really stop. To work around it, we'll only write the context
back to the thread when either the user or GDB explicitly change
it between stopping and resuming. */
if (memcmp (&th->context, &th->base_context, sizeof (CONTEXT)) != 0)
#endif
{
#ifdef __x86_64__
if (wow64_process)
win32_Wow64SetThreadContext (th->h, &th->wow64_context);
else
#endif
SetThreadContext (th->h, &th->context);
}
}
/* Set the thread context of the thread associated with TH. */
static void
win32_prepare_to_resume (windows_thread_info *th)
{
if (the_low_target.prepare_to_resume != NULL)
(*the_low_target.prepare_to_resume) (th);
}
/* See win32-low.h. */
void
win32_require_context (windows_thread_info *th)
{
DWORD context_flags;
#ifdef __x86_64__
if (wow64_process)
context_flags = th->wow64_context.ContextFlags;
else
#endif
context_flags = th->context.ContextFlags;
if (context_flags == 0)
{
th->suspend ();
win32_get_thread_context (th);
}
}
/* See nat/windows-nat.h. */
windows_thread_info *
windows_nat::thread_rec (ptid_t ptid, thread_disposition_type disposition)
{
thread_info *thread = find_thread_ptid (ptid);
if (thread == NULL)
return NULL;
windows_thread_info *th = (windows_thread_info *) thread_target_data (thread);
if (disposition != DONT_INVALIDATE_CONTEXT)
win32_require_context (th);
return th;
}
/* Add a thread to the thread list. */
static windows_thread_info *
child_add_thread (DWORD pid, DWORD tid, HANDLE h, void *tlb)
{
windows_thread_info *th;
ptid_t ptid = ptid_t (pid, tid, 0);
if ((th = thread_rec (ptid, DONT_INVALIDATE_CONTEXT)))
return th;
CORE_ADDR base = (CORE_ADDR) (uintptr_t) tlb;
#ifdef __x86_64__
/* For WOW64 processes, this is actually the pointer to the 64bit TIB,
and the 32bit TIB is exactly 2 pages after it. */
if (wow64_process)
base += 2 * 4096; /* page size = 4096 */
#endif
th = new windows_thread_info (tid, h, base);
add_thread (ptid, th);
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 (thread_info *thread)
{
windows_thread_info *th = (windows_thread_info *) thread_target_data (thread);
remove_thread (thread);
delete th;
}
/* Delete a thread from the list of threads. */
static void
child_delete_thread (DWORD pid, DWORD tid)
{
/* If the last thread is exiting, just return. */
if (all_threads.size () == 1)
return;
thread_info *thread = find_thread_ptid (ptid_t (pid, tid));
if (thread == NULL)
return;
delete_thread_info (thread);
}
/* These watchpoint related wrapper functions simply pass on the function call
if the low target has registered a corresponding function. */
bool
win32_process_target::supports_z_point_type (char z_type)
{
return (z_type == Z_PACKET_SW_BP
|| (the_low_target.supports_z_point_type != NULL
&& the_low_target.supports_z_point_type (z_type)));
}
int
win32_process_target::insert_point (enum raw_bkpt_type type, CORE_ADDR addr,
int size, raw_breakpoint *bp)
{
if (type == raw_bkpt_type_sw)
return insert_memory_breakpoint (bp);
else if (the_low_target.insert_point != NULL)
return the_low_target.insert_point (type, addr, size, bp);
else
/* Unsupported (see target.h). */
return 1;
}
int
win32_process_target::remove_point (enum raw_bkpt_type type, CORE_ADDR addr,
int size, raw_breakpoint *bp)
{
if (type == raw_bkpt_type_sw)
return remove_memory_breakpoint (bp);
else if (the_low_target.remove_point != NULL)
return the_low_target.remove_point (type, addr, size, bp);
else
/* Unsupported (see target.h). */
return 1;
}
bool
win32_process_target::stopped_by_watchpoint ()
{
if (the_low_target.stopped_by_watchpoint != NULL)
return the_low_target.stopped_by_watchpoint ();
else
return false;
}
CORE_ADDR
win32_process_target::stopped_data_address ()
{
if (the_low_target.stopped_data_address != NULL)
return the_low_target.stopped_data_address ();
else
return 0;
}
/* Transfer memory from/to the debugged process. */
static int
child_xfer_memory (CORE_ADDR memaddr, char *our, int len,
int write, process_stratum_target *target)
{
BOOL success;
SIZE_T done = 0;
DWORD lasterror = 0;
uintptr_t addr = (uintptr_t) memaddr;
if (write)
{
success = WriteProcessMemory (current_process_handle, (LPVOID) addr,
(LPCVOID) our, len, &done);
if (!success)
lasterror = GetLastError ();
FlushInstructionCache (current_process_handle, (LPCVOID) addr, len);
}
else
{
success = ReadProcessMemory (current_process_handle, (LPCVOID) addr,
(LPVOID) our, len, &done);
if (!success)
lasterror = GetLastError ();
}
if (!success && lasterror == ERROR_PARTIAL_COPY && done > 0)
return done;
else
return success ? done : -1;
}
/* Clear out any old thread list and reinitialize it to a pristine
state. */
static void
child_init_thread_list (void)
{
for_each_thread (delete_thread_info);
}
/* Zero during the child initialization phase, and nonzero otherwise. */
static int child_initialization_done = 0;
static void
do_initial_child_stuff (HANDLE proch, DWORD pid, int attached)
{
struct process_info *proc;
last_sig = GDB_SIGNAL_0;
current_process_handle = proch;
current_process_id = pid;
main_thread_id = 0;
soft_interrupt_requested = 0;
faked_breakpoint = 0;
open_process_used = true;
memset (&current_event, 0, sizeof (current_event));
#ifdef __x86_64__
BOOL wow64;
if (!IsWow64Process (proch, &wow64))
{
DWORD err = GetLastError ();
error ("Check if WOW64 process failed (error %d): %s\n",
(int) err, strwinerror (err));
}
wow64_process = wow64;
if (wow64_process
&& (win32_Wow64GetThreadContext == nullptr
|| win32_Wow64SetThreadContext == nullptr))
error ("WOW64 debugging is not supported on this system.\n");
ignore_first_breakpoint = !attached && wow64_process;
#endif
proc = add_process (pid, attached);
#ifdef __x86_64__
if (wow64_process)
proc->tdesc = wow64_win32_tdesc;
else
#endif
proc->tdesc = win32_tdesc;
child_init_thread_list ();
child_initialization_done = 0;
if (the_low_target.initial_stuff != NULL)
(*the_low_target.initial_stuff) ();
cached_status.kind = TARGET_WAITKIND_IGNORE;
/* Flush all currently pending debug events (thread and dll list) up
to the initial breakpoint. */
while (1)
{
struct target_waitstatus status;
the_target->wait (minus_one_ptid, &status, 0);
/* Note win32_wait doesn't return thread events. */
if (status.kind != TARGET_WAITKIND_LOADED)
{
cached_status = status;
break;
}
{
struct thread_resume resume;
resume.thread = minus_one_ptid;
resume.kind = resume_continue;
resume.sig = 0;
the_target->resume (&resume, 1);
}
}
#ifndef _WIN32_WCE
/* 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. */
win32_add_all_dlls ();
#endif
child_initialization_done = 1;
}
/* Resume all artificially suspended threads if we are continuing
execution. */
static void
continue_one_thread (thread_info *thread, int thread_id)
{
windows_thread_info *th = (windows_thread_info *) thread_target_data (thread);
if (thread_id == -1 || thread_id == th->tid)
{
win32_prepare_to_resume (th);
if (th->suspended)
{
DWORD *context_flags;
#ifdef __x86_64__
if (wow64_process)
context_flags = &th->wow64_context.ContextFlags;
else
#endif
context_flags = &th->context.ContextFlags;
if (*context_flags)
{
win32_set_thread_context (th);
*context_flags = 0;
}
th->resume ();
}
}
}
static BOOL
child_continue (DWORD continue_status, int thread_id)
{
desired_stop_thread_id = thread_id;
if (matching_pending_stop (debug_threads))
return TRUE;
/* The inferior will only continue after the ContinueDebugEvent
call. */
for_each_thread ([&] (thread_info *thread)
{
continue_one_thread (thread, thread_id);
});
faked_breakpoint = 0;
return continue_last_debug_event (continue_status, debug_threads);
}
/* Fetch register(s) from the current thread context. */
static void
child_fetch_inferior_registers (struct regcache *regcache, int r)
{
int regno;
windows_thread_info *th = thread_rec (current_thread_ptid (),
INVALIDATE_CONTEXT);
if (r == -1 || r > NUM_REGS)
child_fetch_inferior_registers (regcache, NUM_REGS);
else
for (regno = 0; regno < r; regno++)
(*the_low_target.fetch_inferior_register) (regcache, 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 (struct regcache *regcache, int r)
{
int regno;
windows_thread_info *th = thread_rec (current_thread_ptid (),
INVALIDATE_CONTEXT);
if (r == -1 || r == 0 || r > NUM_REGS)
child_store_inferior_registers (regcache, NUM_REGS);
else
for (regno = 0; regno < r; regno++)
(*the_low_target.store_inferior_register) (regcache, 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 */
(LPTSTR) &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 (%u)", (unsigned) error);
SetLastError (lasterr);
return buf;
}
static BOOL
create_process (const char *program, char *args,
DWORD flags, PROCESS_INFORMATION *pi)
{
const char *inferior_cwd = get_inferior_cwd ();
BOOL ret;
size_t argslen, proglen;
proglen = strlen (program) + 1;
argslen = strlen (args) + proglen;
#ifdef _WIN32_WCE
wchar_t *p, *wprogram, *wargs, *wcwd = NULL;
wprogram = (wchar_t *) alloca (proglen * sizeof (wchar_t));
mbstowcs (wprogram, program, proglen);
for (p = wprogram; *p; ++p)
if (L'/' == *p)
*p = L'\\';
wargs = alloca ((argslen + 1) * sizeof (wchar_t));
wcscpy (wargs, wprogram);
wcscat (wargs, L" ");
mbstowcs (wargs + proglen, args, argslen + 1 - proglen);
if (inferior_cwd != NULL)
{
std::string expanded_infcwd = gdb_tilde_expand (inferior_cwd);
std::replace (expanded_infcwd.begin (), expanded_infcwd.end (),
'/', '\\');
wcwd = alloca ((expanded_infcwd.size () + 1) * sizeof (wchar_t));
if (mbstowcs (wcwd, expanded_infcwd.c_str (),
expanded_infcwd.size () + 1) == NULL)
{
error (_("\
Could not convert the expanded inferior cwd to wide-char."));
}
}
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 */
wcwd, /* current directory */
NULL, /* start info, not supported */
pi); /* proc info */
#else
STARTUPINFOA si = { sizeof (STARTUPINFOA) };
char *program_and_args = (char *) alloca (argslen + 1);
strcpy (program_and_args, program);
strcat (program_and_args, " ");
strcat (program_and_args, args);
ret = CreateProcessA (program, /* image name */
program_and_args, /* command line */
NULL, /* security */
NULL, /* thread */
TRUE, /* inherit handles */
flags, /* start flags */
NULL, /* environment */
/* current directory */
(inferior_cwd == NULL
? NULL
: gdb_tilde_expand (inferior_cwd).c_str()),
&si, /* start info */
pi); /* proc info */
#endif
return ret;
}
/* Start a new process.
PROGRAM is the program name.
PROGRAM_ARGS is the vector containing the inferior's args.
Returns the new PID on success, -1 on failure. Registers the new
process with the process list. */
int
win32_process_target::create_inferior (const char *program,
const std::vector<char *> &program_args)
{
client_state &cs = get_client_state ();
#ifndef USE_WIN32API
char real_path[PATH_MAX];
char *orig_path, *new_path, *path_ptr;
#endif
BOOL ret;
DWORD flags;
PROCESS_INFORMATION pi;
DWORD err;
std::string str_program_args = construct_inferior_arguments (program_args);
char *args = (char *) str_program_args.c_str ();
/* win32_wait needs to know we're not attaching. */
attaching = 0;
if (!program)
error ("No executable specified, specify executable to debug.\n");
flags = DEBUG_PROCESS | DEBUG_ONLY_THIS_PROCESS;
#ifndef USE_WIN32API
orig_path = NULL;
path_ptr = getenv ("PATH");
if (path_ptr)
{
int size = cygwin_conv_path_list (CCP_POSIX_TO_WIN_A, path_ptr, NULL, 0);
orig_path = (char *) alloca (strlen (path_ptr) + 1);
new_path = (char *) alloca (size);
strcpy (orig_path, path_ptr);
cygwin_conv_path_list (CCP_POSIX_TO_WIN_A, path_ptr, new_path, size);
setenv ("PATH", new_path, 1);
}
cygwin_conv_path (CCP_POSIX_TO_WIN_A, program, real_path, PATH_MAX);
program = real_path;
#endif
OUTMSG2 (("Command line is \"%s %s\"\n", program, 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 = (char *) 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 %s\n", program, (char *) args));
}
#ifndef _WIN32_WCE
/* On Windows CE this handle can't be closed. The OS reuses
it in the debug events, while the 9x/NT versions of Windows
probably use a DuplicateHandle'd one. */
CloseHandle (pi.hThread);
#endif
do_initial_child_stuff (pi.hProcess, pi.dwProcessId, 0);
/* Wait till we are at 1st instruction in program, return new pid
(assuming success). */
cs.last_ptid = wait (ptid_t (current_process_id), &cs.last_status, 0);
/* Necessary for handle_v_kill. */
signal_pid = 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. */
int
win32_process_target::attach (unsigned long pid)
{
HANDLE h;
winapi_DebugSetProcessKillOnExit DebugSetProcessKillOnExit = NULL;
DWORD err;
#ifdef _WIN32_WCE
HMODULE dll = GetModuleHandle (_T("COREDLL.DLL"));
#else
HMODULE dll = GetModuleHandle (_T("KERNEL32.DLL"));
#endif
DebugSetProcessKillOnExit = GETPROCADDRESS (dll, DebugSetProcessKillOnExit);
h = OpenProcess (PROCESS_ALL_ACCESS, FALSE, pid);
if (h != NULL)
{
if (DebugActiveProcess (pid))
{
if (DebugSetProcessKillOnExit != NULL)
DebugSetProcessKillOnExit (FALSE);
/* win32_wait needs to know we're attaching. */
attaching = 1;
do_initial_child_stuff (h, pid, 1);
return 0;
}
CloseHandle (h);
}
err = GetLastError ();
error ("Attach to process failed (error %d): %s\n",
(int) err, strwinerror (err));
}
/* See nat/windows-nat.h. */
int
windows_nat::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 0;
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 0;
wcstombs (s, buffer, (nbytes + 1) / sizeof (WCHAR));
}
else
{
if (read_inferior_memory (addr, (unsigned char *) s, nbytes) != 0)
return 0;
}
if (!startswith (s, "cYg"))
{
if (!server_waiting)
{
OUTMSG2(("%s", s));
return 0;
}
monitor_output (s);
}
#undef READ_BUFFER_LEN
return 0;
}
static void
win32_clear_inferiors (void)
{
if (open_process_used)
{
CloseHandle (current_process_handle);
open_process_used = false;
}
for_each_thread (delete_thread_info);
siginfo_er.ExceptionCode = 0;
clear_inferiors ();
}
/* Implementation of target_ops::kill. */
int
win32_process_target::kill (process_info *process)
{
TerminateProcess (current_process_handle, 0);
for (;;)
{
if (!child_continue (DBG_CONTINUE, -1))
break;
if (!wait_for_debug_event (&current_event, INFINITE))
break;
if (current_event.dwDebugEventCode == EXIT_PROCESS_DEBUG_EVENT)
break;
else if (current_event.dwDebugEventCode == OUTPUT_DEBUG_STRING_EVENT)
handle_output_debug_string (nullptr);
}
win32_clear_inferiors ();
remove_process (process);
return 0;
}
/* Implementation of target_ops::detach. */
int
win32_process_target::detach (process_info *process)
{
winapi_DebugActiveProcessStop DebugActiveProcessStop = NULL;
winapi_DebugSetProcessKillOnExit DebugSetProcessKillOnExit = NULL;
#ifdef _WIN32_WCE
HMODULE dll = GetModuleHandle (_T("COREDLL.DLL"));
#else
HMODULE dll = GetModuleHandle (_T("KERNEL32.DLL"));
#endif
DebugActiveProcessStop = GETPROCADDRESS (dll, DebugActiveProcessStop);
DebugSetProcessKillOnExit = GETPROCADDRESS (dll, DebugSetProcessKillOnExit);
if (DebugSetProcessKillOnExit == NULL
|| DebugActiveProcessStop == NULL)
return -1;
{
struct thread_resume resume;
resume.thread = minus_one_ptid;
resume.kind = resume_continue;
resume.sig = 0;
this->resume (&resume, 1);
}
if (!DebugActiveProcessStop (current_process_id))
return -1;
DebugSetProcessKillOnExit (FALSE);
remove_process (process);
win32_clear_inferiors ();
return 0;
}
void
win32_process_target::mourn (struct process_info *process)
{
remove_process (process);
}
/* Implementation of target_ops::join. */
void
win32_process_target::join (int pid)
{
HANDLE h = OpenProcess (PROCESS_ALL_ACCESS, FALSE, pid);
if (h != NULL)
{
WaitForSingleObject (h, INFINITE);
CloseHandle (h);
}
}
/* Return true iff the thread with thread ID TID is alive. */
bool
win32_process_target::thread_alive (ptid_t ptid)
{
/* Our thread list is reliable; don't bother to poll target
threads. */
return find_thread_ptid (ptid) != NULL;
}
/* Resume the inferior process. RESUME_INFO describes how we want
to resume. */
void
win32_process_target::resume (thread_resume *resume_info, size_t n)
{
DWORD tid;
enum gdb_signal sig;
int step;
windows_thread_info *th;
DWORD continue_status = DBG_CONTINUE;
ptid_t ptid;
/* This handles the very limited set of resume packets that GDB can
currently produce. */
if (n == 1 && resume_info[0].thread == minus_one_ptid)
tid = -1;
else if (n > 1)
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 != minus_one_ptid)
{
sig = gdb_signal_from_host (resume_info[0].sig);
step = resume_info[0].kind == resume_step;
}
else
{
sig = GDB_SIGNAL_0;
step = 0;
}
if (sig != GDB_SIGNAL_0)
{
if (current_event.dwDebugEventCode != EXCEPTION_DEBUG_EVENT)
{
OUTMSG (("Cannot continue with signal %s here.\n",
gdb_signal_to_string (sig)));
}
else if (sig == last_sig)
continue_status = DBG_EXCEPTION_NOT_HANDLED;
else
OUTMSG (("Can only continue with received signal %s.\n",
gdb_signal_to_string (last_sig)));
}
last_sig = GDB_SIGNAL_0;
/* Get context for the currently selected thread. */
ptid = debug_event_ptid (&current_event);
th = thread_rec (ptid, DONT_INVALIDATE_CONTEXT);
if (th)
{
win32_prepare_to_resume (th);
DWORD *context_flags;
#ifdef __x86_64__
if (wow64_process)
context_flags = &th->wow64_context.ContextFlags;
else
#endif
context_flags = &th->context.ContextFlags;
if (*context_flags)
{
/* Move register values from the inferior into the thread
context structure. */
regcache_invalidate ();
if (step)
{
if (the_low_target.single_step != NULL)
(*the_low_target.single_step) (th);
else
error ("Single stepping is not supported "
"in this configuration.\n");
}
win32_set_thread_context (th);
*context_flags = 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
/* 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. */
load_addr += 0x1000;
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
}
#ifndef _WIN32_WCE
if (strcasecmp (buf, "ntdll.dll") == 0)
{
GetSystemDirectoryA (buf, sizeof (buf));
strcat (buf, "\\ntdll.dll");
}
#endif
#ifdef __CYGWIN__
cygwin_conv_path (CCP_WIN_A_TO_POSIX, buf, buf2, sizeof (buf2));
#else
strcpy (buf2, buf);
#endif
loaded_dll (buf2, load_addr);
}
typedef BOOL (WINAPI *winapi_EnumProcessModules) (HANDLE, HMODULE *,
DWORD, LPDWORD);
#ifdef __x86_64__
typedef BOOL (WINAPI *winapi_EnumProcessModulesEx) (HANDLE, HMODULE *, DWORD,
LPDWORD, DWORD);
#endif
typedef BOOL (WINAPI *winapi_GetModuleInformation) (HANDLE, HMODULE,
LPMODULEINFO, DWORD);
typedef DWORD (WINAPI *winapi_GetModuleFileNameExA) (HANDLE, HMODULE,
LPSTR, DWORD);
static winapi_EnumProcessModules win32_EnumProcessModules;
#ifdef __x86_64__
static winapi_EnumProcessModulesEx win32_EnumProcessModulesEx;
#endif
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);
#ifdef __x86_64__
win32_EnumProcessModulesEx =
GETPROCADDRESS (dll, EnumProcessModulesEx);
#endif
win32_GetModuleInformation =
GETPROCADDRESS (dll, GetModuleInformation);
win32_GetModuleFileNameExA =
GETPROCADDRESS (dll, GetModuleFileNameExA);
}
#ifdef __x86_64__
if (wow64_process && win32_EnumProcessModulesEx == nullptr)
return FALSE;
#endif
return (win32_EnumProcessModules != NULL
&& win32_GetModuleInformation != NULL
&& win32_GetModuleFileNameExA != NULL);
}
#ifndef _WIN32_WCE
/* Iterate over all DLLs currently mapped by our inferior, and
add them to our list of solibs. */
static void
win32_add_all_dlls (void)
{
size_t i;
HMODULE dh_buf[1];
HMODULE *DllHandle = dh_buf;
DWORD cbNeeded;
BOOL ok;
if (!load_psapi ())
return;
cbNeeded = 0;
#ifdef __x86_64__
if (wow64_process)
ok = (*win32_EnumProcessModulesEx) (current_process_handle,
DllHandle,
sizeof (HMODULE),
&cbNeeded,
LIST_MODULES_32BIT);
else
#endif
ok = (*win32_EnumProcessModules) (current_process_handle,
DllHandle,
sizeof (HMODULE),
&cbNeeded);
if (!ok || !cbNeeded)
return;
DllHandle = (HMODULE *) alloca (cbNeeded);
if (!DllHandle)
return;
#ifdef __x86_64__
if (wow64_process)
ok = (*win32_EnumProcessModulesEx) (current_process_handle,
DllHandle,
cbNeeded,
&cbNeeded,
LIST_MODULES_32BIT);
else
#endif
ok = (*win32_EnumProcessModules) (current_process_handle,
DllHandle,
cbNeeded,
&cbNeeded);
if (!ok)
return;
char system_dir[MAX_PATH];
char syswow_dir[MAX_PATH];
size_t system_dir_len = 0;
bool convert_syswow_dir = false;
#ifdef __x86_64__
if (wow64_process)
#endif
{
/* This fails on 32bit Windows because it has no SysWOW64 directory,
and in this case a path conversion isn't necessary. */
UINT len = GetSystemWow64DirectoryA (syswow_dir, sizeof (syswow_dir));
if (len > 0)
{
/* Check that we have passed a large enough buffer. */
gdb_assert (len < sizeof (syswow_dir));
len = GetSystemDirectoryA (system_dir, sizeof (system_dir));
/* Error check. */
gdb_assert (len != 0);
/* Check that we have passed a large enough buffer. */
gdb_assert (len < sizeof (system_dir));
strcat (system_dir, "\\");
strcat (syswow_dir, "\\");
system_dir_len = strlen (system_dir);
convert_syswow_dir = true;
}
}
for (i = 1; i < ((size_t) cbNeeded / sizeof (HMODULE)); i++)
{
MODULEINFO mi;
char dll_name[MAX_PATH];
if (!(*win32_GetModuleInformation) (current_process_handle,
DllHandle[i],
&mi,
sizeof (mi)))
continue;
if ((*win32_GetModuleFileNameExA) (current_process_handle,
DllHandle[i],
dll_name,
MAX_PATH) == 0)
continue;
const char *name = dll_name;
/* Convert the DLL path of 32bit processes returned by
GetModuleFileNameEx from the 64bit system directory to the
32bit syswow64 directory if necessary. */
std::string syswow_dll_path;
if (convert_syswow_dir
&& strncasecmp (dll_name, system_dir, system_dir_len) == 0
&& strchr (dll_name + system_dir_len, '\\') == nullptr)
{
syswow_dll_path = syswow_dir;
syswow_dll_path += dll_name + system_dir_len;
name = syswow_dll_path.c_str();
}
win32_add_one_solib (name, (CORE_ADDR) (uintptr_t) mi.lpBaseOfDll);
}
}
#endif
typedef HANDLE (WINAPI *winapi_CreateToolhelp32Snapshot) (DWORD, DWORD);
typedef BOOL (WINAPI *winapi_Module32First) (HANDLE, LPMODULEENTRY32);
typedef BOOL (WINAPI *winapi_Module32Next) (HANDLE, LPMODULEENTRY32);
/* See nat/windows-nat.h. */
void
windows_nat::handle_load_dll ()
{
LOAD_DLL_DEBUG_INFO *event = &current_event.u.LoadDll;
const char *dll_name;
dll_name = get_image_name (current_process_handle,
event->lpImageName, event->fUnicode);
if (!dll_name)
return;
win32_add_one_solib (dll_name, (CORE_ADDR) (uintptr_t) event->lpBaseOfDll);
}
/* See nat/windows-nat.h. */
void
windows_nat::handle_unload_dll ()
{
CORE_ADDR load_addr =
(CORE_ADDR) (uintptr_t) current_event.u.UnloadDll.lpBaseOfDll;
/* 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. */
load_addr += 0x1000;
unloaded_dll (NULL, load_addr);
}
static void
suspend_one_thread (thread_info *thread)
{
windows_thread_info *th = (windows_thread_info *) thread_target_data (thread);
th->suspend ();
}
static void
fake_breakpoint_event (void)
{
OUTMSG2(("fake_breakpoint_event\n"));
faked_breakpoint = 1;
memset (&current_event, 0, sizeof (current_event));
current_event.dwThreadId = main_thread_id;
current_event.dwDebugEventCode = EXCEPTION_DEBUG_EVENT;
current_event.u.Exception.ExceptionRecord.ExceptionCode
= EXCEPTION_BREAKPOINT;
for_each_thread (suspend_one_thread);
}
#ifdef _WIN32_WCE
static int
auto_delete_breakpoint (CORE_ADDR stop_pc)
{
return 1;
}
#endif
/* See nat/windows-nat.h. */
bool
windows_nat::handle_ms_vc_exception (const EXCEPTION_RECORD *rec)
{
return false;
}
/* See nat/windows-nat.h. */
bool
windows_nat::handle_access_violation (const EXCEPTION_RECORD *rec)
{
return false;
}
/* A helper function that will, if needed, set
'stopped_at_software_breakpoint' on the thread and adjust the
PC. */
static void
maybe_adjust_pc ()
{
struct regcache *regcache = get_thread_regcache (current_thread, 1);
child_fetch_inferior_registers (regcache, -1);
windows_thread_info *th = thread_rec (current_thread_ptid (),
DONT_INVALIDATE_CONTEXT);
th->stopped_at_software_breakpoint = false;
if (current_event.dwDebugEventCode == EXCEPTION_DEBUG_EVENT
&& ((current_event.u.Exception.ExceptionRecord.ExceptionCode
== EXCEPTION_BREAKPOINT)
|| (current_event.u.Exception.ExceptionRecord.ExceptionCode
== STATUS_WX86_BREAKPOINT))
&& child_initialization_done)
{
th->stopped_at_software_breakpoint = true;
CORE_ADDR pc = regcache_read_pc (regcache);
CORE_ADDR sw_breakpoint_pc = pc - the_low_target.decr_pc_after_break;
regcache_write_pc (regcache, sw_breakpoint_pc);
}
}
/* Get the next event from the child. */
static int
get_child_debug_event (DWORD *continue_status,
struct target_waitstatus *ourstatus)
{
ptid_t ptid;
last_sig = GDB_SIGNAL_0;
ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
*continue_status = DBG_CONTINUE;
/* Check if GDB sent us an interrupt request. */
check_remote_input_interrupt_request ();
if (soft_interrupt_requested)
{
soft_interrupt_requested = 0;
fake_breakpoint_event ();
goto gotevent;
}
attaching = 0;
{
gdb::optional<pending_stop> stop = fetch_pending_stop (debug_threads);
if (stop.has_value ())
{
*ourstatus = stop->status;
current_event = stop->event;
ptid = debug_event_ptid (&current_event);
current_thread = find_thread_ptid (ptid);
return 1;
}
/* Keep the wait time low enough for comfortable remote
interruption, but high enough so gdbserver doesn't become a
bottleneck. */
if (!wait_for_debug_event (&current_event, 250))
{
DWORD e = GetLastError();
if (e == ERROR_PIPE_NOT_CONNECTED)
{
/* This will happen if the loader fails to succesfully
load the application, e.g., if the main executable
tries to pull in a non-existing export from a
DLL. */
ourstatus->kind = TARGET_WAITKIND_EXITED;
ourstatus->value.integer = 1;
return 1;
}
return 0;
}
}
gotevent:
switch (current_event.dwDebugEventCode)
{
case CREATE_THREAD_DEBUG_EVENT:
OUTMSG2 (("gdbserver: kernel event CREATE_THREAD_DEBUG_EVENT "
"for pid=%u tid=%x)\n",
(unsigned) current_event.dwProcessId,
(unsigned) current_event.dwThreadId));
/* Record the existence of this thread. */
child_add_thread (current_event.dwProcessId,
current_event.dwThreadId,
current_event.u.CreateThread.hThread,
current_event.u.CreateThread.lpThreadLocalBase);
break;
case EXIT_THREAD_DEBUG_EVENT:
OUTMSG2 (("gdbserver: kernel event EXIT_THREAD_DEBUG_EVENT "
"for pid=%u tid=%x\n",
(unsigned) current_event.dwProcessId,
(unsigned) current_event.dwThreadId));
child_delete_thread (current_event.dwProcessId,
current_event.dwThreadId);
current_thread = get_first_thread ();
return 1;
case CREATE_PROCESS_DEBUG_EVENT:
OUTMSG2 (("gdbserver: kernel event CREATE_PROCESS_DEBUG_EVENT "
"for pid=%u tid=%x\n",
(unsigned) current_event.dwProcessId,
(unsigned) current_event.dwThreadId));
CloseHandle (current_event.u.CreateProcessInfo.hFile);
if (open_process_used)
{
CloseHandle (current_process_handle);
open_process_used = false;
}
current_process_handle = current_event.u.CreateProcessInfo.hProcess;
main_thread_id = current_event.dwThreadId;
/* Add the main thread. */
child_add_thread (current_event.dwProcessId,
main_thread_id,
current_event.u.CreateProcessInfo.hThread,
current_event.u.CreateProcessInfo.lpThreadLocalBase);
break;
case EXIT_PROCESS_DEBUG_EVENT:
OUTMSG2 (("gdbserver: kernel event EXIT_PROCESS_DEBUG_EVENT "
"for pid=%u tid=%x\n",
(unsigned) current_event.dwProcessId,
(unsigned) current_event.dwThreadId));
{
DWORD exit_status = current_event.u.ExitProcess.dwExitCode;
/* If the exit status looks like a fatal exception, but we
don't recognize the exception's code, make the original
exit status value available, to avoid losing information. */
int exit_signal
= WIFSIGNALED (exit_status) ? WTERMSIG (exit_status) : -1;
if (exit_signal == -1)
{
ourstatus->kind = TARGET_WAITKIND_EXITED;
ourstatus->value.integer = exit_status;
}
else
{
ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
ourstatus->value.sig = gdb_signal_from_host (exit_signal);
}
}
child_continue (DBG_CONTINUE, desired_stop_thread_id);
break;
case LOAD_DLL_DEBUG_EVENT:
OUTMSG2 (("gdbserver: kernel event LOAD_DLL_DEBUG_EVENT "
"for pid=%u tid=%x\n",
(unsigned) current_event.dwProcessId,
(unsigned) current_event.dwThreadId));
CloseHandle (current_event.u.LoadDll.hFile);
if (! child_initialization_done)
break;
handle_load_dll ();
ourstatus->kind = TARGET_WAITKIND_LOADED;
ourstatus->value.sig = GDB_SIGNAL_TRAP;
break;
case UNLOAD_DLL_DEBUG_EVENT:
OUTMSG2 (("gdbserver: kernel event UNLOAD_DLL_DEBUG_EVENT "
"for pid=%u tid=%x\n",
(unsigned) current_event.dwProcessId,
(unsigned) current_event.dwThreadId));
if (! child_initialization_done)
break;
handle_unload_dll ();
ourstatus->kind = TARGET_WAITKIND_LOADED;
ourstatus->value.sig = GDB_SIGNAL_TRAP;
break;
case EXCEPTION_DEBUG_EVENT:
OUTMSG2 (("gdbserver: kernel event EXCEPTION_DEBUG_EVENT "
"for pid=%u tid=%x\n",
(unsigned) current_event.dwProcessId,
(unsigned) current_event.dwThreadId));
if (handle_exception (ourstatus, debug_threads)
== HANDLE_EXCEPTION_UNHANDLED)
*continue_status = DBG_EXCEPTION_NOT_HANDLED;
break;
case OUTPUT_DEBUG_STRING_EVENT:
/* A message from the kernel (or Cygwin). */
OUTMSG2 (("gdbserver: kernel event OUTPUT_DEBUG_STRING_EVENT "
"for pid=%u tid=%x\n",
(unsigned) current_event.dwProcessId,
(unsigned) current_event.dwThreadId));
handle_output_debug_string (nullptr);
break;
default:
OUTMSG2 (("gdbserver: kernel event unknown "
"for pid=%u tid=%x code=%x\n",
(unsigned) current_event.dwProcessId,
(unsigned) current_event.dwThreadId,
(unsigned) current_event.dwDebugEventCode));
break;
}
ptid = debug_event_ptid (&current_event);
if (desired_stop_thread_id != -1 && desired_stop_thread_id != ptid.lwp ())
{
/* Pending stop. See the comment by the definition of
"pending_stops" for details on why this is needed. */
OUTMSG2 (("get_windows_debug_event - "
"unexpected stop in 0x%lx (expecting 0x%x)\n",
ptid.lwp (), desired_stop_thread_id));
maybe_adjust_pc ();
pending_stops.push_back ({(DWORD) ptid.lwp (), *ourstatus, current_event});
ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
}
else
current_thread = find_thread_ptid (ptid);
return 1;
}
/* Wait for the inferior process to change state.
STATUS will be filled in with a response code to send to GDB.
Returns the signal which caused the process to stop. */
ptid_t
win32_process_target::wait (ptid_t ptid, target_waitstatus *ourstatus,
target_wait_flags options)
{
if (cached_status.kind != TARGET_WAITKIND_IGNORE)
{
/* The core always does a wait after creating the inferior, and
do_initial_child_stuff already ran the inferior to the
initial breakpoint (or an exit, if creating the process
fails). Report it now. */
*ourstatus = cached_status;
cached_status.kind = TARGET_WAITKIND_IGNORE;
return debug_event_ptid (&current_event);
}
while (1)
{
DWORD continue_status;
if (!get_child_debug_event (&continue_status, ourstatus))
continue;
switch (ourstatus->kind)
{
case TARGET_WAITKIND_EXITED:
OUTMSG2 (("Child exited with retcode = %x\n",
ourstatus->value.integer));
win32_clear_inferiors ();
return ptid_t (current_event.dwProcessId);
case TARGET_WAITKIND_STOPPED:
case TARGET_WAITKIND_SIGNALLED:
case TARGET_WAITKIND_LOADED:
{
OUTMSG2 (("Child Stopped with signal = %d \n",
ourstatus->value.sig));
maybe_adjust_pc ();
return debug_event_ptid (&current_event);
}
default:
OUTMSG (("Ignoring unknown internal event, %d\n", ourstatus->kind));
/* fall-through */
case TARGET_WAITKIND_SPURIOUS:
/* do nothing, just continue */
child_continue (continue_status, desired_stop_thread_id);
break;
}
}
}
/* Fetch registers from the inferior process.
If REGNO is -1, fetch all registers; otherwise, fetch at least REGNO. */
void
win32_process_target::fetch_registers (regcache *regcache, int regno)
{
child_fetch_inferior_registers (regcache, regno);
}
/* Store registers to the inferior process.
If REGNO is -1, store all registers; otherwise, store at least REGNO. */
void
win32_process_target::store_registers (regcache *regcache, int regno)
{
child_store_inferior_registers (regcache, 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. */
int
win32_process_target::read_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. */
int
win32_process_target::write_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. */
void
win32_process_target::request_interrupt ()
{
winapi_DebugBreakProcess DebugBreakProcess;
winapi_GenerateConsoleCtrlEvent GenerateConsoleCtrlEvent;
#ifdef _WIN32_WCE
HMODULE dll = GetModuleHandle (_T("COREDLL.DLL"));
#else
HMODULE dll = GetModuleHandle (_T("KERNEL32.DLL"));
#endif
GenerateConsoleCtrlEvent = GETPROCADDRESS (dll, GenerateConsoleCtrlEvent);
if (GenerateConsoleCtrlEvent != NULL
&& GenerateConsoleCtrlEvent (CTRL_BREAK_EVENT, current_process_id))
return;
/* GenerateConsoleCtrlEvent can fail if process id being debugged is
not a process group id.
Fallback to XP/Vista 'DebugBreakProcess', which generates a
breakpoint exception in the interior process. */
DebugBreakProcess = GETPROCADDRESS (dll, DebugBreakProcess);
if (DebugBreakProcess != NULL
&& DebugBreakProcess (current_process_handle))
return;
/* Last resort, suspend all threads manually. */
soft_interrupt_requested = 1;
}
bool
win32_process_target::supports_hardware_single_step ()
{
return true;
}
#ifdef _WIN32_WCE
int
win32_error_to_fileio_error (DWORD err)
{
switch (err)
{
case ERROR_BAD_PATHNAME:
case ERROR_FILE_NOT_FOUND:
case ERROR_INVALID_NAME:
case ERROR_PATH_NOT_FOUND:
return FILEIO_ENOENT;
case ERROR_CRC:
case ERROR_IO_DEVICE:
case ERROR_OPEN_FAILED:
return FILEIO_EIO;
case ERROR_INVALID_HANDLE:
return FILEIO_EBADF;
case ERROR_ACCESS_DENIED:
case ERROR_SHARING_VIOLATION:
return FILEIO_EACCES;
case ERROR_NOACCESS:
return FILEIO_EFAULT;
case ERROR_BUSY:
return FILEIO_EBUSY;
case ERROR_ALREADY_EXISTS:
case ERROR_FILE_EXISTS:
return FILEIO_EEXIST;
case ERROR_BAD_DEVICE:
return FILEIO_ENODEV;
case ERROR_DIRECTORY:
return FILEIO_ENOTDIR;
case ERROR_FILENAME_EXCED_RANGE:
case ERROR_INVALID_DATA:
case ERROR_INVALID_PARAMETER:
case ERROR_NEGATIVE_SEEK:
return FILEIO_EINVAL;
case ERROR_TOO_MANY_OPEN_FILES:
return FILEIO_EMFILE;
case ERROR_HANDLE_DISK_FULL:
case ERROR_DISK_FULL:
return FILEIO_ENOSPC;
case ERROR_WRITE_PROTECT:
return FILEIO_EROFS;
case ERROR_NOT_SUPPORTED:
return FILEIO_ENOSYS;
}
return FILEIO_EUNKNOWN;
}
void
win32_process_target::hostio_last_error (char *buf)
{
DWORD winerr = GetLastError ();
int fileio_err = win32_error_to_fileio_error (winerr);
sprintf (buf, "F-1,%x", fileio_err);
}
#endif
bool
win32_process_target::supports_qxfer_siginfo ()
{
return true;
}
/* Write Windows signal info. */
int
win32_process_target::qxfer_siginfo (const char *annex,
unsigned char *readbuf,
unsigned const char *writebuf,
CORE_ADDR offset, int len)
{
if (siginfo_er.ExceptionCode == 0)
return -1;
if (readbuf == nullptr)
return -1;
char *buf = (char *) &siginfo_er;
size_t bufsize = sizeof (siginfo_er);
#ifdef __x86_64__
EXCEPTION_RECORD32 er32;
if (wow64_process)
{
buf = (char *) &er32;
bufsize = sizeof (er32);
er32.ExceptionCode = siginfo_er.ExceptionCode;
er32.ExceptionFlags = siginfo_er.ExceptionFlags;
er32.ExceptionRecord = (uintptr_t) siginfo_er.ExceptionRecord;
er32.ExceptionAddress = (uintptr_t) siginfo_er.ExceptionAddress;
er32.NumberParameters = siginfo_er.NumberParameters;
int i;
for (i = 0; i < EXCEPTION_MAXIMUM_PARAMETERS; i++)
er32.ExceptionInformation[i] = siginfo_er.ExceptionInformation[i];
}
#endif
if (offset > bufsize)
return -1;
if (offset + len > bufsize)
len = bufsize - offset;
memcpy (readbuf, buf + offset, len);
return len;
}
bool
win32_process_target::supports_get_tib_address ()
{
return true;
}
/* Write Windows OS Thread Information Block address. */
int
win32_process_target::get_tib_address (ptid_t ptid, CORE_ADDR *addr)
{
windows_thread_info *th;
th = thread_rec (ptid, DONT_INVALIDATE_CONTEXT);
if (th == NULL)
return 0;
if (addr != NULL)
*addr = th->thread_local_base;
return 1;
}
/* Implementation of the target_ops method "sw_breakpoint_from_kind". */
const gdb_byte *
win32_process_target::sw_breakpoint_from_kind (int kind, int *size)
{
*size = the_low_target.breakpoint_len;
return the_low_target.breakpoint;
}
bool
win32_process_target::stopped_by_sw_breakpoint ()
{
windows_thread_info *th = thread_rec (current_thread_ptid (),
DONT_INVALIDATE_CONTEXT);
return th == nullptr ? false : th->stopped_at_software_breakpoint;
}
bool
win32_process_target::supports_stopped_by_sw_breakpoint ()
{
return true;
}
CORE_ADDR
win32_process_target::read_pc (struct regcache *regcache)
{
return (*the_low_target.get_pc) (regcache);
}
void
win32_process_target::write_pc (struct regcache *regcache, CORE_ADDR pc)
{
return (*the_low_target.set_pc) (regcache, pc);
}
/* The win32 target ops object. */
static win32_process_target the_win32_target;
/* Initialize the Win32 backend. */
void
initialize_low (void)
{
set_target_ops (&the_win32_target);
the_low_target.arch_setup ();
#ifdef __x86_64__
/* These functions are loaded dynamically, because they are not available
on Windows XP. */
HMODULE dll = GetModuleHandle (_T("KERNEL32.DLL"));
win32_Wow64GetThreadContext = GETPROCADDRESS (dll, Wow64GetThreadContext);
win32_Wow64SetThreadContext = GETPROCADDRESS (dll, Wow64SetThreadContext);
#endif
}
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