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old-cross-binutils/gdb/gdbserver/win32-i386-low.c
Daniel Jacobowitz 6aba47ca06 Copyright updates for 2007.
2007-01-09 17:59:20 +00:00

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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 2 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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA. */
#include "server.h"
#include "regcache.h"
#include "gdb/signals.h"
#include <windows.h>
#include <imagehlp.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)
#endif
int debug_threads;
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;
static int debug_registers_changed = 0;
static int debug_registers_used = 0;
static unsigned dr[8];
typedef BOOL winapi_DebugActiveProcessStop (DWORD dwProcessId);
typedef BOOL winapi_DebugSetProcessKillOnExit (BOOL KillOnExit);
#define FLAG_TRACE_BIT 0x100
#define CONTEXT_DEBUGGER (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
#define CONTEXT_DEBUGGER_DR CONTEXT_DEBUGGER | CONTEXT_DEBUG_REGISTERS \
| CONTEXT_EXTENDED_REGISTERS
/* Thread information structure used to track extra information about
each thread. */
typedef struct thread_info_struct
{
DWORD tid;
HANDLE h;
int suspend_count;
CONTEXT context;
} thread_info;
static DWORD main_thread_id = 0;
/* Get the thread ID from the current selected inferior (the current
thread). */
static DWORD
current_inferior_tid (void)
{
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 thread_info *
thread_rec (DWORD id, int get_context)
{
struct thread_info *thread;
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 (get_context > 0 && id != current_event.dwThreadId)
th->suspend_count = SuspendThread (th->h) + 1;
else if (get_context < 0)
th->suspend_count = -1;
th->context.ContextFlags = CONTEXT_DEBUGGER_DR;
GetThreadContext (th->h, &th->context);
if (id == current_event.dwThreadId)
{
/* Copy dr values from that thread. */
dr[0] = th->context.Dr0;
dr[1] = th->context.Dr1;
dr[2] = th->context.Dr2;
dr[3] = th->context.Dr3;
dr[6] = th->context.Dr6;
dr[7] = th->context.Dr7;
}
}
return th;
}
/* Add a thread to the thread list. */
static thread_info *
child_add_thread (DWORD tid, HANDLE h)
{
thread_info *th;
if ((th = thread_rec (tid, FALSE)))
return th;
th = (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 ());
/* Set the debug registers for the new thread if they are used. */
if (debug_registers_used)
{
/* Only change the value of the debug registers. */
th->context.ContextFlags = CONTEXT_DEBUGGER_DR;
GetThreadContext (th->h, &th->context);
th->context.Dr0 = dr[0];
th->context.Dr1 = dr[1];
th->context.Dr2 = dr[2];
th->context.Dr3 = dr[3];
/* th->context.Dr6 = dr[6];
FIXME: should we set dr6 also ?? */
th->context.Dr7 = dr[7];
SetThreadContext (th->h, &th->context);
th->context.ContextFlags = 0;
}
return th;
}
/* Delete a thread from the list of threads. */
static void
delete_thread_info (struct inferior_list_entry *thread)
{
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 something
(e.g. it called load(2) on AIX). */
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 happened, but we stopped anyway. This perhaps should be handled
within target_wait, but I'm not sure target_wait should be resuming the
inferior. */
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;
};
#define NUM_REGS 41
#define FCS_REGNUM 27
#define FOP_REGNUM 31
#define context_offset(x) ((int)&(((CONTEXT *)NULL)->x))
static const int mappings[] = {
context_offset (Eax),
context_offset (Ecx),
context_offset (Edx),
context_offset (Ebx),
context_offset (Esp),
context_offset (Ebp),
context_offset (Esi),
context_offset (Edi),
context_offset (Eip),
context_offset (EFlags),
context_offset (SegCs),
context_offset (SegSs),
context_offset (SegDs),
context_offset (SegEs),
context_offset (SegFs),
context_offset (SegGs),
context_offset (FloatSave.RegisterArea[0 * 10]),
context_offset (FloatSave.RegisterArea[1 * 10]),
context_offset (FloatSave.RegisterArea[2 * 10]),
context_offset (FloatSave.RegisterArea[3 * 10]),
context_offset (FloatSave.RegisterArea[4 * 10]),
context_offset (FloatSave.RegisterArea[5 * 10]),
context_offset (FloatSave.RegisterArea[6 * 10]),
context_offset (FloatSave.RegisterArea[7 * 10]),
context_offset (FloatSave.ControlWord),
context_offset (FloatSave.StatusWord),
context_offset (FloatSave.TagWord),
context_offset (FloatSave.ErrorSelector),
context_offset (FloatSave.ErrorOffset),
context_offset (FloatSave.DataSelector),
context_offset (FloatSave.DataOffset),
context_offset (FloatSave.ErrorSelector),
/* XMM0-7 */
context_offset (ExtendedRegisters[10 * 16]),
context_offset (ExtendedRegisters[11 * 16]),
context_offset (ExtendedRegisters[12 * 16]),
context_offset (ExtendedRegisters[13 * 16]),
context_offset (ExtendedRegisters[14 * 16]),
context_offset (ExtendedRegisters[15 * 16]),
context_offset (ExtendedRegisters[16 * 16]),
context_offset (ExtendedRegisters[17 * 16]),
/* MXCSR */
context_offset (ExtendedRegisters[24])
};
#undef context_offset
/* Clear out any old thread list and reintialize 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)
{
int i;
last_sig = TARGET_SIGNAL_0;
debug_registers_changed = 0;
debug_registers_used = 0;
for (i = 0; i < sizeof (dr) / sizeof (dr[0]); i++)
dr[i] = 0;
memset (&current_event, 0, sizeof (current_event));
child_init_thread_list ();
}
/* 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;
thread_info *th = inferior_target_data (thread);
int i;
if ((thread_id == -1 || thread_id == th->tid)
&& th->suspend_count)
{
for (i = 0; i < th->suspend_count; i++)
(void) ResumeThread (th->h);
th->suspend_count = 0;
if (debug_registers_changed)
{
/* Only change the value of the debug registers. */
th->context.ContextFlags = CONTEXT_DEBUG_REGISTERS;
th->context.Dr0 = dr[0];
th->context.Dr1 = dr[1];
th->context.Dr2 = dr[2];
th->context.Dr3 = dr[3];
/* th->context.Dr6 = dr[6];
FIXME: should we set dr6 also ?? */
th->context.Dr7 = dr[7];
SetThreadContext (th->h, &th->context);
th->context.ContextFlags = 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);
continue_status = 0;
if (res)
find_inferior (&all_threads, continue_one_thread, &thread_id);
debug_registers_changed = 0;
return res;
}
/* Fetch register(s) from gdbserver regcache data. */
static void
do_child_fetch_inferior_registers (thread_info *th, int r)
{
char *context_offset = ((char *) &th->context) + mappings[r];
long l;
if (r == FCS_REGNUM)
{
l = *((long *) context_offset) & 0xffff;
supply_register (r, (char *) &l);
}
else if (r == FOP_REGNUM)
{
l = (*((long *) context_offset) >> 16) & ((1 << 11) - 1);
supply_register (r, (char *) &l);
}
else
supply_register (r, context_offset);
}
/* Fetch register(s) from the current thread context. */
static void
child_fetch_inferior_registers (int r)
{
int regno;
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++)
do_child_fetch_inferior_registers (th, regno);
}
/* Get register from gdbserver regcache data. */
static void
do_child_store_inferior_registers (thread_info *th, int r)
{
collect_register (r, ((char *) &th->context) + mappings[r]);
}
/* 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;
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++)
do_child_store_inferior_registers (th, regno);
}
/* 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
char *winenv = NULL;
STARTUPINFO si;
PROCESS_INFORMATION pi;
BOOL ret;
DWORD flags;
char *args;
int argslen;
int argc;
if (!program)
error ("No executable specified, specify executable to debug.\n");
memset (&si, 0, sizeof (si));
si.cb = sizeof (si);
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 = strlen (program) + 1;
for (argc = 1; program_args[argc]; argc++)
argslen += strlen (program_args[argc]) + 1;
args = alloca (argslen);
strcpy (args, program);
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));
flags |= CREATE_NEW_PROCESS_GROUP;
ret = CreateProcess (0, args, /* command line */
NULL, /* Security */
NULL, /* thread */
TRUE, /* inherit handles */
flags, /* start flags */
winenv, NULL, /* current directory */
&si, &pi);
#ifndef USE_WIN32API
if (orig_path)
setenv ("PATH", orig_path, 1);
#endif
if (!ret)
{
error ("Error creating process %s, (error %d): %s\n", args,
(int) GetLastError (), strerror (GetLastError ()));
}
else
{
OUTMSG2 (("Process created: %s\n", (char *) args));
}
CloseHandle (pi.hThread);
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)
{
int res = 0;
HMODULE kernel32 = LoadLibrary ("KERNEL32.DLL");
winapi_DebugActiveProcessStop *DebugActiveProcessStop = NULL;
winapi_DebugSetProcessKillOnExit *DebugSetProcessKillOnExit = NULL;
DebugActiveProcessStop =
(winapi_DebugActiveProcessStop *) GetProcAddress (kernel32,
"DebugActiveProcessStop");
DebugSetProcessKillOnExit =
(winapi_DebugSetProcessKillOnExit *) GetProcAddress (kernel32,
"DebugSetProcessKillOnExit");
res = DebugActiveProcess (pid) ? 1 : 0;
if (!res)
error ("Attach to process failed.");
if (DebugSetProcessKillOnExit != NULL)
DebugSetProcessKillOnExit (FALSE);
current_process_id = pid;
current_process_handle = OpenProcess (PROCESS_ALL_ACCESS, FALSE, pid);
if (current_process_handle == NULL)
{
res = 0;
if (DebugActiveProcessStop != NULL)
DebugActiveProcessStop (current_process_id);
}
if (res)
do_initial_child_stuff (pid);
FreeLibrary (kernel32);
return res;
}
/* Kill all inferiors. */
static void
win32_kill (void)
{
if (current_process_handle == NULL)
return;
TerminateProcess (current_process_handle, 0);
for (;;)
{
if (!child_continue (DBG_CONTINUE, -1))
break;
if (!WaitForDebugEvent (&current_event, INFINITE))
break;
if (current_event.dwDebugEventCode == EXIT_PROCESS_DEBUG_EVENT)
break;
}
}
/* Detach from all inferiors. */
static void
win32_detach (void)
{
HMODULE kernel32 = LoadLibrary ("KERNEL32.DLL");
winapi_DebugActiveProcessStop *DebugActiveProcessStop = NULL;
winapi_DebugSetProcessKillOnExit *DebugSetProcessKillOnExit = NULL;
DebugActiveProcessStop =
(winapi_DebugActiveProcessStop *) GetProcAddress (kernel32,
"DebugActiveProcessStop");
DebugSetProcessKillOnExit =
(winapi_DebugSetProcessKillOnExit *) GetProcAddress (kernel32,
"DebugSetProcessKillOnExit");
if (DebugSetProcessKillOnExit != NULL)
DebugSetProcessKillOnExit (FALSE);
if (DebugActiveProcessStop != NULL)
DebugActiveProcessStop (current_process_id);
else
win32_kill ();
FreeLibrary (kernel32);
}
/* 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;
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)
{
if (debug_registers_changed)
{
th->context.Dr0 = dr[0];
th->context.Dr1 = dr[1];
th->context.Dr2 = dr[2];
th->context.Dr3 = dr[3];
/* th->context.Dr6 = dr[6];
FIXME: should we set dr6 also ?? */
th->context.Dr7 = dr[7];
}
/* Move register values from the inferior into the thread
context structure. */
regcache_invalidate ();
if (step)
th->context.EFlags |= FLAG_TRACE_BIT;
SetThreadContext (th->h, &th->context);
th->context.ContextFlags = 0;
}
}
/* Allow continuing with the same signal that interrupted us.
Otherwise complain. */
child_continue (continue_status, tid);
}
static int
handle_exception (struct target_waitstatus *ourstatus)
{
thread_info *th;
DWORD code = current_event.u.Exception.ExceptionRecord.ExceptionCode;
ourstatus->kind = TARGET_WAITKIND_STOPPED;
/* Record the context of the current thread. */
th = thread_rec (current_event.dwThreadId, -1);
switch (code)
{
case EXCEPTION_ACCESS_VIOLATION:
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;
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)
return 0;
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;
return 1;
}
/* Get the next event from the child. Return 1 if the event requires
handling. */
static int
get_child_debug_event (struct target_waitstatus *ourstatus)
{
BOOL debug_event;
DWORD continue_status, event_code;
thread_info *th = NULL;
static thread_info dummy_thread_info;
int retval = 0;
in:
last_sig = TARGET_SIGNAL_0;
ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
if (!(debug_event = WaitForDebugEvent (&current_event, 1000)))
goto out;
current_inferior =
(struct thread_info *) find_inferior_id (&all_threads,
current_event.dwThreadId);
continue_status = DBG_CONTINUE;
event_code = current_event.dwDebugEventCode;
switch (event_code)
{
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. */
th = child_add_thread (current_event.dwThreadId,
current_event.u.CreateThread.hThread);
retval = current_event.dwThreadId;
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);
th = &dummy_thread_info;
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. */
th =
child_add_thread (main_thread_id,
current_event.u.CreateProcessInfo.hThread);
retval = ourstatus->value.related_pid = current_event.dwThreadId;
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;
retval = main_thread_id;
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);
ourstatus->kind = TARGET_WAITKIND_LOADED;
ourstatus->value.integer = 0;
retval = main_thread_id;
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));
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));
retval = 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));
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);
if (!retval || (event_code != EXCEPTION_DEBUG_EVENT && event_code != EXIT_PROCESS_DEBUG_EVENT))
{
child_continue (continue_status, -1);
goto in;
}
if (th == NULL)
thread_rec (current_event.dwThreadId, TRUE);
out:
return retval;
}
/* 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)
{
get_child_debug_event (&our_status);
if (our_status.kind == 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;
}
else if (our_status.kind == TARGET_WAITKIND_STOPPED)
{
OUTMSG2 (("Child Stopped with signal = %x \n",
WSTOPSIG (our_status.value.sig)));
*status = 'T';
child_fetch_inferior_registers (-1);
return our_status.value.sig;
}
else
OUTMSG (("Ignoring unknown internal event, %d\n", our_status.kind));
{
struct thread_resume resume;
resume.thread = -1;
resume.step = 0;
resume.sig = 0;
resume.leave_stopped = 0;
win32_resume (&resume);
}
}
}
/* 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, 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;
}
static struct target_ops win32_target_ops = {
win32_create_inferior,
win32_attach,
win32_kill,
win32_detach,
win32_thread_alive,
win32_resume,
win32_wait,
win32_fetch_inferior_registers,
win32_store_inferior_registers,
win32_read_inferior_memory,
win32_write_inferior_memory,
0,
0
};
/* Initialize the Win32 backend. */
void
initialize_low (void)
{
set_target_ops (&win32_target_ops);
init_registers ();
}
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