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wine/programs/winedbg/tgt_active.c
Eric Pouech fdd1c1c776 winedbg: Detect debuggee termination before first exception. 
When a crash in a program happens, and the debugger in launched in --auto
mode, in some cases the program terminates before the debugger has gotten
proper context on debuggee.
(Could be a watchdog in programs checking if it's debugged and terminating
itself if so).

Detect debuggee termination and still provide some information on debuggee
(threads, modules, system info). The backtrace will not be available as
no exception is gotten from debuggee.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=55187
Signed-off-by: Eric Pouech <epouech@codeweavers.com>
2023-07-07 12:20:23 +02:00

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/*
* Wine debugger - back-end for an active target
*
* Copyright 2000-2006 Eric Pouech
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include "debugger.h"
#include "psapi.h"
#include "resource.h"
#include "winternl.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(winedbg);
static char* dbg_executable;
static char* dbg_last_cmd_line;
static struct be_process_io be_process_active_io;
static void dbg_init_current_process(void)
{
}
static void dbg_init_current_thread(void* start)
{
if (start)
{
if (list_count(&dbg_curr_process->threads) == 1 /* first thread ? */ &&
DBG_IVAR(BreakAllThreadsStartup))
{
ADDRESS64 addr;
break_set_xpoints(FALSE);
addr.Mode = AddrModeFlat;
addr.Offset = (DWORD_PTR)start;
break_add_break(&addr, TRUE, TRUE);
break_set_xpoints(TRUE);
}
}
}
static unsigned dbg_handle_debug_event(DEBUG_EVENT* de);
/******************************************************************
* dbg_attach_debuggee
*
* Sets the debuggee to <pid>
* cofe instructs winedbg what to do when first exception is received
* (break=FALSE, continue=TRUE)
* wfe is set to TRUE if dbg_attach_debuggee should also proceed with all debug events
* until the first exception is received (aka: attach to an already running process)
*/
BOOL dbg_attach_debuggee(DWORD pid)
{
if (pid == GetCurrentProcessId())
{
dbg_printf("WineDbg can't debug its own process. Please use another process ID.\n");
return FALSE;
}
if (!(dbg_curr_process = dbg_add_process(&be_process_active_io, pid, 0))) return FALSE;
if (!DebugActiveProcess(pid))
{
dbg_printf("Can't attach process %04lx: error %lu\n", pid, GetLastError());
dbg_del_process(dbg_curr_process);
return FALSE;
}
SetEnvironmentVariableA("DBGHELP_NOLIVE", NULL);
dbg_curr_process->active_debuggee = TRUE;
return TRUE;
}
static unsigned dbg_fetch_context(void)
{
if (!dbg_curr_process->be_cpu->get_context(dbg_curr_thread->handle, &dbg_context))
{
WINE_WARN("Can't get thread's context\n");
return FALSE;
}
return TRUE;
}
BOOL dbg_set_curr_thread(DWORD tid)
{
struct dbg_thread* thread;
if (!dbg_curr_process)
{
dbg_printf("No process loaded\n");
return FALSE;
}
thread = dbg_get_thread(dbg_curr_process, tid);
if (thread)
{
dbg_curr_thread = thread;
dbg_fetch_context();
stack_fetch_frames(&dbg_context);
dbg_curr_tid = tid;
return TRUE;
}
dbg_printf("No such thread\n");
return thread != NULL;
}
/***********************************************************************
* dbg_exception_prolog
*
* Examine exception and decide if interactive mode is entered(return TRUE)
* or exception is silently continued(return FALSE)
* is_debug means the exception is a breakpoint or single step exception
*/
static BOOL dbg_exception_prolog(BOOL is_debug, const EXCEPTION_RECORD* rec)
{
ADDRESS64 addr;
BOOL is_break;
memory_get_current_pc(&addr);
break_suspend_execution();
/* this will resynchronize builtin dbghelp's internal ELF module list */
SymLoadModule(dbg_curr_process->handle, 0, 0, 0, 0, 0);
if (is_debug) break_adjust_pc(&addr, rec->ExceptionCode, dbg_curr_thread->first_chance, &is_break);
/*
* Do a quiet backtrace so that we have an idea of what the situation
* is WRT the source files.
*/
stack_fetch_frames(&dbg_context);
if (is_debug && !is_break && break_should_continue(&addr, rec->ExceptionCode))
return FALSE;
if (addr.Mode != dbg_curr_thread->addr_mode)
{
const char* name;
switch (addr.Mode)
{
case AddrMode1616: name = "16 bit"; break;
case AddrMode1632: name = "segmented 32 bit"; break;
case AddrModeReal: name = "vm86"; break;
case AddrModeFlat: name = dbg_curr_process->be_cpu->pointer_size == 4
? "32 bit" : "64 bit"; break;
default: return FALSE;
}
dbg_printf("In %s mode.\n", name);
dbg_curr_thread->addr_mode = addr.Mode;
}
display_print();
if (!is_debug)
{
/* This is a real crash, dump some info */
dbg_curr_process->be_cpu->print_context(dbg_curr_thread->handle, &dbg_context, 0);
stack_info(-1);
dbg_curr_process->be_cpu->print_segment_info(dbg_curr_thread->handle, &dbg_context);
stack_backtrace(dbg_curr_tid);
}
else
{
static char* last_name;
static char* last_file;
char buffer[sizeof(SYMBOL_INFO) + 256];
SYMBOL_INFO* si = (SYMBOL_INFO*)buffer;
void* lin = memory_to_linear_addr(&addr);
DWORD64 disp64;
IMAGEHLP_LINE64 il;
DWORD disp;
si->SizeOfStruct = sizeof(*si);
si->MaxNameLen = 256;
il.SizeOfStruct = sizeof(il);
if (SymFromAddr(dbg_curr_process->handle, (DWORD_PTR)lin, &disp64, si) &&
SymGetLineFromAddr64(dbg_curr_process->handle, (DWORD_PTR)lin, &disp, &il))
{
if ((!last_name || strcmp(last_name, si->Name)) ||
(!last_file || strcmp(last_file, il.FileName)))
{
free(last_name);
free(last_file);
last_name = strdup(si->Name);
last_file = strdup(il.FileName);
dbg_printf("%s () at %s:%lu\n", last_name, last_file, il.LineNumber);
}
}
}
if (!is_debug || is_break ||
dbg_curr_thread->exec_mode == dbg_exec_step_over_insn ||
dbg_curr_thread->exec_mode == dbg_exec_step_into_insn)
{
ADDRESS64 tmp = addr;
/* Show where we crashed */
memory_disasm_one_insn(&tmp);
}
source_list_from_addr(&addr, 0);
return TRUE;
}
static void dbg_exception_epilog(void)
{
break_restart_execution(dbg_curr_thread->exec_count);
/*
* This will have gotten absorbed into the breakpoint info
* if it was used. Otherwise it would have been ignored.
* In any case, we don't mess with it any more.
*/
if (dbg_curr_thread->exec_mode == dbg_exec_cont)
dbg_curr_thread->exec_count = 0;
dbg_curr_thread->in_exception = FALSE;
}
static DWORD dbg_handle_exception(const EXCEPTION_RECORD* rec, BOOL first_chance)
{
BOOL is_debug = FALSE;
const THREADNAME_INFO* pThreadName;
struct dbg_thread* pThread;
assert(dbg_curr_thread);
WINE_TRACE("exception=%lx first_chance=%c\n",
rec->ExceptionCode, first_chance ? 'Y' : 'N');
switch (rec->ExceptionCode)
{
case EXCEPTION_BREAKPOINT:
case EXCEPTION_SINGLE_STEP:
is_debug = TRUE;
break;
case EXCEPTION_WINE_NAME_THREAD:
pThreadName = (const THREADNAME_INFO*)(rec->ExceptionInformation);
if (pThreadName->dwType != 0x1000)
return DBG_EXCEPTION_NOT_HANDLED;
if (pThreadName->dwThreadID == -1)
pThread = dbg_curr_thread;
else
pThread = dbg_get_thread(dbg_curr_process, pThreadName->dwThreadID);
if(!pThread)
{
dbg_printf("Thread ID=%04lx not in our list of threads -> can't rename\n", pThreadName->dwThreadID);
return DBG_CONTINUE;
}
if (dbg_read_memory(pThreadName->szName, pThread->name, sizeof(pThread->name)))
{
pThread->name[sizeof(pThread->name) - 1] = '\0';
dbg_printf("Thread ID=%04lx renamed using MSVC extension (name==\"%s\")\n",
pThread->tid, pThread->name);
}
return DBG_CONTINUE;
case EXCEPTION_INVALID_HANDLE:
return DBG_CONTINUE;
}
if (first_chance && !is_debug && !DBG_IVAR(BreakOnFirstChance) &&
!(rec->ExceptionFlags & EH_STACK_INVALID))
{
/* pass exception to program except for debug exceptions */
return DBG_EXCEPTION_NOT_HANDLED;
}
dbg_curr_thread->excpt_record = *rec;
dbg_curr_thread->in_exception = TRUE;
dbg_curr_thread->first_chance = first_chance;
if (!is_debug) info_win32_exception();
if (rec->ExceptionCode == STATUS_POSSIBLE_DEADLOCK && !DBG_IVAR(BreakOnCritSectTimeOut))
{
dbg_curr_thread->in_exception = FALSE;
return DBG_EXCEPTION_NOT_HANDLED;
}
if (dbg_exception_prolog(is_debug, rec))
{
dbg_interactiveP = TRUE;
return 0;
}
dbg_exception_epilog();
return DBG_CONTINUE;
}
static BOOL tgt_process_active_close_process(struct dbg_process* pcs, BOOL kill);
void fetch_module_name(void* name_addr, void* mod_addr, WCHAR* buffer, size_t bufsz)
{
memory_get_string_indirect(dbg_curr_process, name_addr, TRUE, buffer, bufsz);
if (!buffer[0] && !GetModuleFileNameExW(dbg_curr_process->handle, mod_addr, buffer, bufsz))
{
if (GetMappedFileNameW( dbg_curr_process->handle, mod_addr, buffer, bufsz ))
{
/* FIXME: proper NT->Dos conversion */
static const WCHAR nt_prefixW[] = {'\\','?','?','\\'};
if (!wcsncmp( buffer, nt_prefixW, 4 ))
memmove( buffer, buffer + 4, (lstrlenW(buffer + 4) + 1) * sizeof(WCHAR) );
}
else
swprintf(buffer, bufsz, L"DLL_%08lx", (ULONG_PTR)mod_addr);
}
}
static unsigned dbg_handle_debug_event(DEBUG_EVENT* de)
{
union {
char bufferA[256];
WCHAR buffer[256];
} u;
DWORD size, cont = DBG_CONTINUE;
dbg_curr_pid = de->dwProcessId;
dbg_curr_tid = de->dwThreadId;
if ((dbg_curr_process = dbg_get_process(de->dwProcessId)) != NULL)
dbg_curr_thread = dbg_get_thread(dbg_curr_process, de->dwThreadId);
else
dbg_curr_thread = NULL;
switch (de->dwDebugEventCode)
{
case EXCEPTION_DEBUG_EVENT:
if (!dbg_curr_thread)
{
WINE_ERR("%04lx:%04lx: not a registered process or thread (perhaps a 16 bit one ?)\n",
de->dwProcessId, de->dwThreadId);
break;
}
WINE_TRACE("%04lx:%04lx: exception code=%08lx\n",
de->dwProcessId, de->dwThreadId,
de->u.Exception.ExceptionRecord.ExceptionCode);
if (dbg_curr_process->event_on_first_exception)
{
SetEvent(dbg_curr_process->event_on_first_exception);
CloseHandle(dbg_curr_process->event_on_first_exception);
dbg_curr_process->event_on_first_exception = NULL;
if (!DBG_IVAR(BreakOnAttach)) break;
}
if (dbg_fetch_context())
{
cont = dbg_handle_exception(&de->u.Exception.ExceptionRecord,
de->u.Exception.dwFirstChance);
if (cont && dbg_curr_thread)
{
dbg_curr_process->be_cpu->set_context(dbg_curr_thread->handle, &dbg_context);
}
}
break;
case CREATE_PROCESS_DEBUG_EVENT:
dbg_curr_process = dbg_add_process(&be_process_active_io, de->dwProcessId,
de->u.CreateProcessInfo.hProcess);
if (dbg_curr_process == NULL)
{
WINE_ERR("Couldn't create process\n");
break;
}
size = ARRAY_SIZE(u.buffer);
if (!QueryFullProcessImageNameW( dbg_curr_process->handle, 0, u.buffer, &size ))
{
swprintf(u.buffer, ARRAY_SIZE(u.buffer), L"Process_%08x", dbg_curr_pid);
}
WINE_TRACE("%04lx:%04lx: create process '%s'/%p @%p (%lu<%lu>)\n",
de->dwProcessId, de->dwThreadId,
wine_dbgstr_w(u.buffer),
de->u.CreateProcessInfo.lpImageName,
de->u.CreateProcessInfo.lpStartAddress,
de->u.CreateProcessInfo.dwDebugInfoFileOffset,
de->u.CreateProcessInfo.nDebugInfoSize);
dbg_set_process_name(dbg_curr_process, u.buffer);
if (!dbg_init(dbg_curr_process->handle, u.buffer, FALSE))
dbg_printf("Couldn't initiate DbgHelp\n");
if (!dbg_load_module(dbg_curr_process->handle, de->u.CreateProcessInfo.hFile, u.buffer,
(DWORD_PTR)de->u.CreateProcessInfo.lpBaseOfImage, 0))
dbg_printf("couldn't load main module (%lu)\n", GetLastError());
WINE_TRACE("%04lx:%04lx: create thread I @%p\n",
de->dwProcessId, de->dwThreadId, de->u.CreateProcessInfo.lpStartAddress);
dbg_curr_thread = dbg_add_thread(dbg_curr_process,
de->dwThreadId,
de->u.CreateProcessInfo.hThread,
de->u.CreateProcessInfo.lpThreadLocalBase);
if (!dbg_curr_thread)
{
WINE_ERR("Couldn't create thread\n");
break;
}
dbg_init_current_process();
dbg_init_current_thread(de->u.CreateProcessInfo.lpStartAddress);
break;
case EXIT_PROCESS_DEBUG_EVENT:
WINE_TRACE("%04lx:%04lx: exit process (%ld)\n",
de->dwProcessId, de->dwThreadId, de->u.ExitProcess.dwExitCode);
if (dbg_curr_process == NULL)
{
WINE_ERR("Unknown process\n");
break;
}
tgt_process_active_close_process(dbg_curr_process, FALSE);
dbg_printf("Process of pid=%04lx has terminated\n", de->dwProcessId);
break;
case CREATE_THREAD_DEBUG_EVENT:
WINE_TRACE("%04lx:%04lx: create thread D @%p\n",
de->dwProcessId, de->dwThreadId, de->u.CreateThread.lpStartAddress);
if (dbg_curr_process == NULL)
{
WINE_ERR("Unknown process\n");
break;
}
if (dbg_get_thread(dbg_curr_process, de->dwThreadId) != NULL)
{
WINE_TRACE("Thread already listed, skipping\n");
break;
}
dbg_curr_thread = dbg_add_thread(dbg_curr_process,
de->dwThreadId,
de->u.CreateThread.hThread,
de->u.CreateThread.lpThreadLocalBase);
if (!dbg_curr_thread)
{
WINE_ERR("Couldn't create thread\n");
break;
}
dbg_init_current_thread(de->u.CreateThread.lpStartAddress);
break;
case EXIT_THREAD_DEBUG_EVENT:
WINE_TRACE("%04lx:%04lx: exit thread (%ld)\n",
de->dwProcessId, de->dwThreadId, de->u.ExitThread.dwExitCode);
if (dbg_curr_thread == NULL)
{
WINE_ERR("Unknown thread\n");
break;
}
/* FIXME: remove break point set on thread startup */
dbg_del_thread(dbg_curr_thread);
break;
case LOAD_DLL_DEBUG_EVENT:
if (dbg_curr_thread == NULL)
{
WINE_ERR("Unknown thread\n");
break;
}
fetch_module_name(de->u.LoadDll.lpImageName, de->u.LoadDll.lpBaseOfDll,
u.buffer, ARRAY_SIZE(u.buffer));
WINE_TRACE("%04lx:%04lx: loads DLL %s @%p (%lu<%lu>)\n",
de->dwProcessId, de->dwThreadId,
wine_dbgstr_w(u.buffer), de->u.LoadDll.lpBaseOfDll,
de->u.LoadDll.dwDebugInfoFileOffset,
de->u.LoadDll.nDebugInfoSize);
dbg_load_module(dbg_curr_process->handle, de->u.LoadDll.hFile, u.buffer,
(DWORD_PTR)de->u.LoadDll.lpBaseOfDll, 0);
break_set_xpoints(FALSE);
break_check_delayed_bp();
break_set_xpoints(TRUE);
if (DBG_IVAR(BreakOnDllLoad))
{
dbg_printf("Stopping on DLL %ls loading at %p\n",
u.buffer, de->u.LoadDll.lpBaseOfDll);
if (dbg_fetch_context()) cont = 0;
}
break;
case UNLOAD_DLL_DEBUG_EVENT:
WINE_TRACE("%04lx:%04lx: unload DLL @%p\n",
de->dwProcessId, de->dwThreadId,
de->u.UnloadDll.lpBaseOfDll);
break_delete_xpoints_from_module((DWORD_PTR)de->u.UnloadDll.lpBaseOfDll);
dbg_unload_module(dbg_curr_process, (DWORD_PTR)de->u.UnloadDll.lpBaseOfDll);
break;
case OUTPUT_DEBUG_STRING_EVENT:
if (dbg_curr_thread == NULL)
{
WINE_ERR("Unknown thread\n");
break;
}
memory_get_string(dbg_curr_process,
de->u.DebugString.lpDebugStringData, TRUE,
de->u.DebugString.fUnicode, u.bufferA, sizeof(u.bufferA));
WINE_TRACE("%04lx:%04lx: output debug string (%s)\n",
de->dwProcessId, de->dwThreadId, u.bufferA);
break;
case RIP_EVENT:
WINE_TRACE("%04lx:%04lx: rip error=%lu type=%lu\n",
de->dwProcessId, de->dwThreadId, de->u.RipInfo.dwError,
de->u.RipInfo.dwType);
break;
default:
WINE_TRACE("%04lx:%04lx: unknown event (%lx)\n",
de->dwProcessId, de->dwThreadId, de->dwDebugEventCode);
}
if (!cont) return TRUE; /* stop execution */
ContinueDebugEvent(de->dwProcessId, de->dwThreadId, cont);
return FALSE; /* continue execution */
}
static void dbg_resume_debuggee(DWORD cont)
{
if (dbg_curr_thread->in_exception)
{
ADDRESS64 addr;
char hexbuf[MAX_OFFSET_TO_STR_LEN];
dbg_exception_epilog();
memory_get_current_pc(&addr);
WINE_TRACE("Exiting debugger PC=%s mode=%d count=%d\n",
memory_offset_to_string(hexbuf, addr.Offset, 0),
dbg_curr_thread->exec_mode,
dbg_curr_thread->exec_count);
if (dbg_curr_thread)
{
if (!dbg_curr_process->be_cpu->set_context(dbg_curr_thread->handle, &dbg_context))
dbg_printf("Cannot set ctx on %04lx\n", dbg_curr_tid);
}
}
dbg_interactiveP = FALSE;
if (!ContinueDebugEvent(dbg_curr_pid, dbg_curr_tid, cont))
dbg_printf("Cannot continue on %04lx (%08lx)\n", dbg_curr_tid, cont);
}
static void wait_exception(void)
{
DEBUG_EVENT de;
while (dbg_num_processes() && WaitForDebugEvent(&de, INFINITE))
{
if (dbg_handle_debug_event(&de)) break;
}
dbg_interactiveP = TRUE;
}
void dbg_wait_next_exception(DWORD cont, int count, int mode)
{
ADDRESS64 addr;
char hexbuf[MAX_OFFSET_TO_STR_LEN];
if (cont == DBG_CONTINUE)
{
dbg_curr_thread->exec_count = count;
dbg_curr_thread->exec_mode = mode;
}
dbg_resume_debuggee(cont);
wait_exception();
if (!dbg_curr_process) return;
memory_get_current_pc(&addr);
WINE_TRACE("Entering debugger PC=%s mode=%d count=%d\n",
memory_offset_to_string(hexbuf, addr.Offset, 0),
dbg_curr_thread->exec_mode,
dbg_curr_thread->exec_count);
}
void dbg_active_wait_for_first_exception(void)
{
dbg_interactiveP = FALSE;
/* wait for first exception */
wait_exception();
}
static BOOL dbg_active_wait_for_startup(DEBUG_EVENT* de)
{
dbg_interactiveP = FALSE;
while (dbg_num_processes() && WaitForDebugEvent(de, INFINITE))
{
switch (de->dwDebugEventCode)
{
case CREATE_PROCESS_DEBUG_EVENT:
case CREATE_THREAD_DEBUG_EVENT:
case LOAD_DLL_DEBUG_EVENT:
case EXCEPTION_DEBUG_EVENT:
if (dbg_handle_debug_event(de)) return TRUE;
break;
default:
return FALSE;
}
}
return FALSE;
}
static BOOL dbg_start_debuggee(LPSTR cmdLine)
{
PROCESS_INFORMATION info;
STARTUPINFOA startup, current;
DWORD flags;
GetStartupInfoA(&current);
memset(&startup, 0, sizeof(startup));
startup.cb = sizeof(startup);
startup.dwFlags = STARTF_USESHOWWINDOW;
startup.wShowWindow = (current.dwFlags & STARTF_USESHOWWINDOW) ?
current.wShowWindow : SW_SHOWNORMAL;
/* FIXME: shouldn't need the CREATE_NEW_CONSOLE, but as usual CUIs need it
* while GUIs don't
*/
flags = DEBUG_PROCESS | CREATE_NEW_CONSOLE;
if (!DBG_IVAR(AlsoDebugProcChild)) flags |= DEBUG_ONLY_THIS_PROCESS;
if (!CreateProcessA(NULL, cmdLine, NULL, NULL, FALSE, flags,
NULL, NULL, &startup, &info))
{
dbg_printf("Couldn't start process '%s'\n", cmdLine);
return FALSE;
}
if (!info.dwProcessId)
{
/* this happens when the program being run is not a Wine binary
* (for example, a shell wrapper around a WineLib app)
*/
/* Current fix: list running processes and let the user attach
* to one of them (sic)
* FIXME: implement a real fix => grab the process (from the
* running processes) from its name
*/
dbg_printf("Debuggee has been started (%s)\n"
"But WineDbg isn't attached to it. Maybe you're trying to debug a winelib wrapper ??\n"
"Try to attach to one of those processes:\n", cmdLine);
/* FIXME: (HACK) we need some time before the wrapper executes the winelib app */
Sleep(100);
info_win32_processes();
return TRUE;
}
dbg_curr_pid = info.dwProcessId;
if (!(dbg_curr_process = dbg_add_process(&be_process_active_io, dbg_curr_pid, 0))) return FALSE;
dbg_curr_process->active_debuggee = TRUE;
if (cmdLine != dbg_last_cmd_line)
{
free(dbg_last_cmd_line);
dbg_last_cmd_line = cmdLine;
}
return TRUE;
}
/***********************************************************************
* dbg_build_command_line
*
* (converted from dlls/ntdll/unix/env.c)
*
* Build the command line of a process from the argv array.
*
* We must quote and escape characters so that the argv array can be rebuilt
* from the command line:
* - spaces and tabs must be quoted
* 'a b' -> '"a b"'
* - quotes must be escaped
* '"' -> '\"'
* - if '\'s are followed by a '"', they must be doubled and followed by '\"',
* resulting in an odd number of '\' followed by a '"'
* '\"' -> '\\\"'
* '\\"' -> '\\\\\"'
* - '\'s are followed by the closing '"' must be doubled,
* resulting in an even number of '\' followed by a '"'
* ' \' -> '" \\"'
* ' \\' -> '" \\\\"'
* - '\'s that are not followed by a '"' can be left as is
* 'a\b' == 'a\b'
* 'a\\b' == 'a\\b'
*/
static char *dbg_build_command_line( char **argv )
{
int len;
char **arg, *ret;
LPSTR p;
len = 1;
for (arg = argv; *arg; arg++) len += 3 + 2 * strlen( *arg );
if (!(ret = malloc( len ))) return NULL;
p = ret;
for (arg = argv; *arg; arg++)
{
BOOL has_space, has_quote;
int i, bcount;
char *a;
/* check for quotes and spaces in this argument (first arg is always quoted) */
has_space = (arg == argv) || !**arg || strchr( *arg, ' ' ) || strchr( *arg, '\t' );
has_quote = strchr( *arg, '"' ) != NULL;
/* now transfer it to the command line */
if (has_space) *p++ = '"';
if (has_quote || has_space)
{
bcount = 0;
for (a = *arg; *a; a++)
{
if (*a == '\\') bcount++;
else
{
if (*a == '"') /* double all the '\\' preceding this '"', plus one */
for (i = 0; i <= bcount; i++) *p++ = '\\';
bcount = 0;
}
*p++ = *a;
}
}
else
{
strcpy( p, *arg );
p += strlen( p );
}
if (has_space)
{
/* Double all the '\' preceding the closing quote */
for (i = 0; i < bcount; i++) *p++ = '\\';
*p++ = '"';
}
*p++ = ' ';
}
if (p > ret) p--; /* remove last space */
*p = 0;
return ret;
}
void dbg_run_debuggee(struct list_string* ls)
{
if (dbg_curr_process)
{
dbg_printf("Already attached to a process. Use 'detach' or 'kill' before using 'run'\n");
return;
}
if (!dbg_executable)
{
dbg_printf("No active target to be restarted\n");
return;
}
if (ls)
{
char* cl;
char** argv;
unsigned argc = 2, i;
struct list_string* cls;
for (cls = ls; cls; cls = cls->next) argc++;
if (!(argv = malloc(argc * sizeof(argv[0])))) return;
argv[0] = dbg_executable;
for (i = 1, cls = ls; cls; cls = cls->next, i++) argv[i] = cls->string;
argv[i] = NULL;
cl = dbg_build_command_line(argv);
free(argv);
if (!cl || !dbg_start_debuggee(cl))
{
free(cl);
return;
}
}
else
{
if (!dbg_last_cmd_line) dbg_last_cmd_line = strdup(dbg_executable);
dbg_start_debuggee(dbg_last_cmd_line);
}
dbg_active_wait_for_first_exception();
source_list_from_addr(NULL, 0);
}
static BOOL str2int(const char* str, DWORD_PTR* val)
{
char* ptr;
*val = strtol(str, &ptr, 0);
return str < ptr && !*ptr;
}
static HANDLE create_temp_file(void)
{
WCHAR path[MAX_PATH], name[MAX_PATH];
if (!GetTempPathW( MAX_PATH, path ) || !GetTempFileNameW( path, L"wdb", 0, name ))
return INVALID_HANDLE_VALUE;
return CreateFileW( name, GENERIC_READ|GENERIC_WRITE|DELETE, FILE_SHARE_DELETE,
NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_DELETE_ON_CLOSE, 0 );
}
/******************************************************************
* dbg_active_attach
*
* Tries to attach to a running process
* Handles the <pid> or <pid> <evt> forms
*/
enum dbg_start dbg_active_attach(int argc, char* argv[])
{
DWORD_PTR pid, evt;
/* try the form <myself> pid */
if (argc == 1 && str2int(argv[0], &pid) && pid != 0)
{
if (!dbg_attach_debuggee(pid))
return start_error_init;
}
/* try the form <myself> pid evt (Win32 JIT debugger) */
else if (argc == 2 && str2int(argv[0], &pid) && pid != 0 &&
str2int(argv[1], &evt) && evt != 0)
{
if (!dbg_attach_debuggee(pid))
{
/* don't care about result */
SetEvent((HANDLE)evt);
return start_error_init;
}
dbg_curr_process->event_on_first_exception = (HANDLE)evt;
}
else return start_error_parse;
dbg_curr_pid = pid;
return start_ok;
}
/******************************************************************
* dbg_active_launch
*
* Launches a debuggee (with its arguments) from argc/argv
*/
enum dbg_start dbg_active_launch(int argc, char* argv[])
{
LPSTR cmd_line;
if (argc == 0) return start_error_parse;
dbg_executable = strdup(argv[0]);
cmd_line = dbg_build_command_line(argv);
if (!dbg_start_debuggee(cmd_line))
{
free(cmd_line);
return start_error_init;
}
return start_ok;
}
/******************************************************************
* dbg_active_auto
*
* Starts (<pid> or <pid> <evt>) in automatic mode
*/
enum dbg_start dbg_active_auto(int argc, char* argv[])
{
HANDLE thread = 0, event = 0, input, output = INVALID_HANDLE_VALUE;
enum dbg_start ds = start_error_parse;
BOOL first_exception = TRUE;
DEBUG_EVENT de;
DBG_IVAR(BreakOnDllLoad) = 0;
/* auto mode */
argc--; argv++;
ds = dbg_active_attach(argc, argv);
if (ds != start_ok) {
msgbox_res_id(NULL, IDS_INVALID_PARAMS, IDS_AUTO_CAPTION, MB_OK);
return ds;
}
switch (display_crash_dialog())
{
case ID_DEBUG:
AllocConsole();
dbg_init_console();
dbg_start_interactive(NULL, INVALID_HANDLE_VALUE);
return start_ok;
case ID_DETAILS:
event = CreateEventW( NULL, TRUE, FALSE, NULL );
if (event) thread = display_crash_details( event );
if (thread) dbg_houtput = output = create_temp_file();
break;
}
input = parser_generate_command_file("echo Modules:", "info share",
"echo Threads:", "info threads",
"info system",
"detach",
NULL);
if (input == INVALID_HANDLE_VALUE) return start_error_parse;
/* debuggee can terminate before we get the first exception.
* so detect end of attach load sequence, and then print information.
*/
if (dbg_curr_process->active_debuggee && !(first_exception = dbg_active_wait_for_startup(&de)))
{
dbg_printf("Couldn't get first exception for process %04lx %ls%s.\n"
"No backtrace available\n",
dbg_curr_pid, dbg_curr_process->imageName, dbg_curr_process->is_wow64 ? " (WOW64)" : "");
}
dbg_interactiveP = TRUE;
parser_handle(NULL, input);
if (!first_exception)
{
/* continue managing debug events, in case the exception event comes after current debug event */
ContinueDebugEvent(de.dwProcessId, de.dwThreadId, DBG_CONTINUE);
dbg_active_wait_for_first_exception();
}
if (output != INVALID_HANDLE_VALUE)
{
SetEvent( event );
WaitForSingleObject( thread, INFINITE );
CloseHandle( output );
CloseHandle( thread );
CloseHandle( event );
}
CloseHandle( input );
return start_ok;
}
/******************************************************************
* dbg_active_minidump
*
* Starts (<pid> or <pid> <evt>) in minidump mode
*/
enum dbg_start dbg_active_minidump(int argc, char* argv[])
{
HANDLE hFile;
enum dbg_start ds = start_error_parse;
const char* file = NULL;
char tmp[8 + 1 + 2 + MAX_PATH]; /* minidump "<file>" */
dbg_houtput = GetStdHandle(STD_ERROR_HANDLE);
DBG_IVAR(BreakOnDllLoad) = 0;
argc--; argv++;
/* hard stuff now ; we can get things like:
* --minidump <pid> 1 arg
* --minidump <pid> <evt> 2 args
* --minidump <file> <pid> 2 args
* --minidump <file> <pid> <evt> 3 args
*/
switch (argc)
{
case 1:
ds = dbg_active_attach(argc, argv);
break;
case 2:
if ((ds = dbg_active_attach(argc, argv)) != start_ok)
{
file = argv[0];
ds = dbg_active_attach(argc - 1, argv + 1);
}
break;
case 3:
file = argv[0];
ds = dbg_active_attach(argc - 1, argv + 1);
break;
default:
return start_error_parse;
}
if (ds != start_ok) return ds;
memcpy(tmp, "minidump \"", 10);
if (!file)
{
char path[MAX_PATH];
GetTempPathA(sizeof(path), path);
GetTempFileNameA(path, "WD", 0, tmp + 10);
}
else strcpy(tmp + 10, file);
strcat(tmp, "\"");
if (!file)
{
/* FIXME: should generate unix name as well */
dbg_printf("Capturing program state in %s\n", tmp + 9);
}
hFile = parser_generate_command_file(tmp, "detach", NULL);
if (hFile == INVALID_HANDLE_VALUE) return start_error_parse;
if (dbg_curr_process->active_debuggee)
dbg_active_wait_for_first_exception();
dbg_interactiveP = TRUE;
parser_handle(NULL, hFile);
return start_ok;
}
static BOOL tgt_process_active_close_process(struct dbg_process* pcs, BOOL kill)
{
if (kill)
{
DWORD exit_code = 0;
if (pcs == dbg_curr_process && dbg_curr_thread->in_exception)
exit_code = dbg_curr_thread->excpt_record.ExceptionCode;
TerminateProcess(pcs->handle, exit_code);
}
else if (pcs == dbg_curr_process)
{
/* remove all set breakpoints in debuggee code */
break_set_xpoints(FALSE);
/* needed for single stepping (ugly).
* should this be handled inside the server ???
*/
dbg_curr_process->be_cpu->single_step(&dbg_context, FALSE);
if (dbg_curr_thread->in_exception)
{
dbg_curr_process->be_cpu->set_context(dbg_curr_thread->handle, &dbg_context);
ContinueDebugEvent(dbg_curr_pid, dbg_curr_tid, DBG_CONTINUE);
}
}
if (!kill)
{
if (!DebugActiveProcessStop(pcs->pid)) return FALSE;
}
SymCleanup(pcs->handle);
dbg_del_process(pcs);
return TRUE;
}
static BOOL tgt_process_active_read(HANDLE hProcess, const void* addr,
void* buffer, SIZE_T len, SIZE_T* rlen)
{
return ReadProcessMemory( hProcess, addr, buffer, len, rlen );
}
static BOOL tgt_process_active_write(HANDLE hProcess, void* addr,
const void* buffer, SIZE_T len, SIZE_T* wlen)
{
return WriteProcessMemory( hProcess, addr, buffer, len, wlen );
}
static BOOL tgt_process_active_get_selector(HANDLE hThread, DWORD sel, LDT_ENTRY* le)
{
return GetThreadSelectorEntry( hThread, sel, le );
}
static struct be_process_io be_process_active_io =
{
tgt_process_active_close_process,
tgt_process_active_read,
tgt_process_active_write,
tgt_process_active_get_selector
};
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