650 lines
16 KiB
C
650 lines
16 KiB
C
/* Target-vector operations for controlling win32 child processes, for GDB.
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Copyright 1995
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Free Software Foundation, Inc.
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Contributed by Cygnus Support.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without eve nthe implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* by Steve Chamberlain, sac@cygnus.com */
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#include "defs.h"
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#include "frame.h" /* required by inferior.h */
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#include "inferior.h"
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#include "target.h"
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#include "wait.h"
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#include "gdbcore.h"
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#include "command.h"
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#include <signal.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <windows.h>
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#include "buildsym.h"
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#include "gdb_string.h"
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#include "thread.h"
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#include "gdbcmd.h"
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#define CHECK(x) check (x, __FILE__,__LINE__)
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#define DEBUG(x) if (remote_debug) printf x
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/* Forward declaration */
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extern struct target_ops child_ops;
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/* The most recently read context. Inspect ContextFlags to see what
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bits are valid. */
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static CONTEXT context;
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/* The process and thread handles for the above context. */
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static HANDLE current_process;
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static HANDLE current_thread;
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static int current_process_id;
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static int current_thread_id;
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/* Counts of things. */
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static int exception_count = 0;
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static int event_count = 0;
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/* User options. */
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static int new_console = 0;
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static int new_group = 0;
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/* This vector maps GDB's idea of a register's number into an address
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in the win32 exception context vector.
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It also contains the bit mask needed to load the register in question.
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One day we could read a reg, we could inspect the context we
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already have loaded, if it doesn't have the bit set that we need,
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we read that set of registers in using GetThreadContext. If the
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context already contains what we need, we just unpack it. Then to
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write a register, first we have to ensure that the context contains
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the other regs of the group, and then we copy the info in and set
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out bit. */
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struct regmappings
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{
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char *incontext;
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int mask;
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};
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static const struct regmappings
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mappings[] =
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{
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{(char *) &context.Eax, CONTEXT_INTEGER},
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{(char *) &context.Ecx, CONTEXT_INTEGER},
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{(char *) &context.Edx, CONTEXT_INTEGER},
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{(char *) &context.Ebx, CONTEXT_INTEGER},
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{(char *) &context.Esp, CONTEXT_CONTROL},
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{(char *) &context.Ebp, CONTEXT_CONTROL},
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{(char *) &context.Esi, CONTEXT_INTEGER},
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{(char *) &context.Edi, CONTEXT_INTEGER},
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{(char *) &context.Eip, CONTEXT_CONTROL},
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{(char *) &context.EFlags, CONTEXT_CONTROL},
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{(char *) &context.SegCs, CONTEXT_SEGMENTS},
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{(char *) &context.SegSs, CONTEXT_SEGMENTS},
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{(char *) &context.SegDs, CONTEXT_SEGMENTS},
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{(char *) &context.SegEs, CONTEXT_SEGMENTS},
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{(char *) &context.SegFs, CONTEXT_SEGMENTS},
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{(char *) &context.SegGs, CONTEXT_SEGMENTS},
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{&context.FloatSave.RegisterArea[0 * 10], CONTEXT_FLOATING_POINT},
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{&context.FloatSave.RegisterArea[1 * 10], CONTEXT_FLOATING_POINT},
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{&context.FloatSave.RegisterArea[2 * 10], CONTEXT_FLOATING_POINT},
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{&context.FloatSave.RegisterArea[3 * 10], CONTEXT_FLOATING_POINT},
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{&context.FloatSave.RegisterArea[4 * 10], CONTEXT_FLOATING_POINT},
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{&context.FloatSave.RegisterArea[5 * 10], CONTEXT_FLOATING_POINT},
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{&context.FloatSave.RegisterArea[6 * 10], CONTEXT_FLOATING_POINT},
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{&context.FloatSave.RegisterArea[7 * 10], CONTEXT_FLOATING_POINT},
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};
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/* This vector maps the target's idea of an exception (extracted
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from the DEBUG_EVENT structure) to GDB's idea. */
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struct xlate_exception
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{
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int them;
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enum target_signal us;
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};
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static const struct xlate_exception
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xlate[] =
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{
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{EXCEPTION_ACCESS_VIOLATION, TARGET_SIGNAL_SEGV},
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{STATUS_STACK_OVERFLOW, TARGET_SIGNAL_SEGV},
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{EXCEPTION_BREAKPOINT, TARGET_SIGNAL_TRAP},
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{DBG_CONTROL_C, TARGET_SIGNAL_INT},
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{EXCEPTION_SINGLE_STEP, TARGET_SIGNAL_TRAP},
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{-1, -1}};
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static void
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check (BOOL ok, const char *file, int line)
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{
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if (!ok)
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printf_filtered ("error return %s:%d was %d\n", file, line, GetLastError ());
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}
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static void
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child_fetch_inferior_registers (int r)
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{
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if (r < 0)
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{
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for (r = 0; r < NUM_REGS; r++)
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child_fetch_inferior_registers (r);
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}
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else
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{
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supply_register (r, mappings[r].incontext);
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}
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}
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static void
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child_store_inferior_registers (int r)
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{
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if (r < 0)
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{
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for (r = 0; r < NUM_REGS; r++)
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child_store_inferior_registers (r);
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}
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else
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{
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read_register_gen (r, mappings[r].incontext);
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}
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}
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/* Wait for child to do something. Return pid of child, or -1 in case
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of error; store status through argument pointer OURSTATUS. */
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static void
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handle_load_dll (DEBUG_EVENT * event)
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{
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DWORD dll_name_ptr;
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DWORD done;
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ReadProcessMemory (current_process,
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(DWORD) event->u.LoadDll.lpImageName,
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(char *) &dll_name_ptr,
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sizeof (dll_name_ptr), &done);
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/* See if we could read the address of a string, and that the
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address isn't null. */
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if (done == sizeof (dll_name_ptr) && dll_name_ptr)
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{
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char *dll_name;
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int size = event->u.LoadDll.fUnicode ? sizeof (WCHAR) : sizeof (char);
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int len = 0;
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char b[2];
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do
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{
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ReadProcessMemory (current_process,
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dll_name_ptr + len * size,
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&b,
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size,
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&done);
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len++;
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}
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while ((b[0] != 0 || b[size - 1] != 0) && done == size);
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dll_name = alloca (len);
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if (event->u.LoadDll.fUnicode)
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{
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WCHAR *unicode_dll_name = (WCHAR *) alloca (len * sizeof (WCHAR));
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ReadProcessMemory (current_process,
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dll_name_ptr,
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unicode_dll_name,
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len * sizeof (WCHAR),
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&done);
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WideCharToMultiByte (CP_ACP, 0,
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unicode_dll_name, len,
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dll_name, len, 0, 0);
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}
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else
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{
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ReadProcessMemory (current_process,
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dll_name_ptr,
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dll_name,
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len,
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&done);
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}
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/* FIXME!! It would be nice to define one symbol which pointed to the
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front of the dll if we can't find any symbols. */
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context.ContextFlags = CONTEXT_FULL;
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GetThreadContext (current_thread, &context);
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symbol_file_add (dll_name, 0, (int) event->u.LoadDll.lpBaseOfDll, 0, 0, 0);
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/* We strip off the path of the dll for tidiness. */
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if (strrchr (dll_name, '\\'))
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dll_name = strrchr (dll_name, '\\') + 1;
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printf_unfiltered ("%x:%s\n", event->u.LoadDll.lpBaseOfDll, dll_name);
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}
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}
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static void
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handle_exception (DEBUG_EVENT * event, struct target_waitstatus *ourstatus)
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{
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int i;
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int done = 0;
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ourstatus->kind = TARGET_WAITKIND_STOPPED;
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for (i = 0; !done && xlate[i].us > 0; i++)
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{
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if (xlate[i].them == event->u.Exception.ExceptionRecord.ExceptionCode)
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{
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ourstatus->value.sig = xlate[i].us;
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done = 1;
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break;
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}
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}
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if (!done)
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{
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printf_unfiltered ("Want to know about exception code %08x\n",
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event->u.Exception.ExceptionRecord.ExceptionCode);
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ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
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}
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context.ContextFlags = CONTEXT_FULL;
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GetThreadContext (current_thread, &context);
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exception_count++;
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}
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static int
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child_wait (int pid, struct target_waitstatus *ourstatus)
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{
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/* We loop when we get a non-standard exception rather than return
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with a SPURIOUS because resume can try and step or modify things,
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which needs a current_thread. But some of these exceptions mark
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the birth or death of threads, which mean that the current thread
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isn't necessarily what you think it is. */
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while (1)
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{
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DEBUG_EVENT event;
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BOOL t = WaitForDebugEvent (&event, INFINITE);
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DEBUG (("%d = WaitForDebugEvent() code=%d pid=%d tid=%d)\n",
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t,
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event.dwDebugEventCode,
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event.dwProcessId,
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event.dwThreadId));
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event_count++;
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current_thread_id = event.dwThreadId;
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current_process_id = event.dwProcessId;
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switch (event.dwDebugEventCode)
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{
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case CREATE_THREAD_DEBUG_EVENT:
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case EXIT_THREAD_DEBUG_EVENT:
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case CREATE_PROCESS_DEBUG_EVENT:
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break;
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case EXIT_PROCESS_DEBUG_EVENT:
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ourstatus->kind = TARGET_WAITKIND_EXITED;
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ourstatus->value.integer = event.u.ExitProcess.dwExitCode;
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CloseHandle (current_process);
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CloseHandle (current_thread);
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return current_process_id;
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break;
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case LOAD_DLL_DEBUG_EVENT:
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handle_load_dll (&event);
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break;
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case EXCEPTION_DEBUG_EVENT:
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handle_exception (&event, ourstatus);
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return current_process_id;
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default:
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printf_unfiltered ("waitfor it %d %d %d %d\n", t,
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event.dwDebugEventCode,
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event.dwProcessId,
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event.dwThreadId);
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break;
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}
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CHECK (ContinueDebugEvent (current_process_id,
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current_thread_id,
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DBG_CONTINUE));
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}
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}
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/* Attach to process PID, then initialize for debugging it. */
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static void
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child_attach (args, from_tty)
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char *args;
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int from_tty;
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{
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BOOL ok;
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if (!args)
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error_no_arg ("process-id to attach");
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current_process_id = strtoul (args, 0, 0);
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ok = DebugActiveProcess (current_process_id);
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if (!ok)
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error ("Can't attach to process.");
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exception_count = 0;
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event_count = 0;
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if (from_tty)
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{
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char *exec_file = (char *) get_exec_file (0);
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if (exec_file)
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printf_unfiltered ("Attaching to program `%s', %s\n", exec_file,
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target_pid_to_str (current_process_id));
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else
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printf_unfiltered ("Attaching to %s\n",
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target_pid_to_str (current_process_id));
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gdb_flush (gdb_stdout);
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}
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inferior_pid = current_process_id;
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push_target (&child_ops);
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}
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static void
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child_detach (args, from_tty)
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char *args;
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int from_tty;
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{
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if (from_tty)
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{
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char *exec_file = get_exec_file (0);
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if (exec_file == 0)
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exec_file = "";
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printf_unfiltered ("Detaching from program: %s %s\n", exec_file,
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target_pid_to_str (inferior_pid));
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gdb_flush (gdb_stdout);
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}
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inferior_pid = 0;
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unpush_target (&child_ops);
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}
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/* Print status information about what we're accessing. */
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static void
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child_files_info (ignore)
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struct target_ops *ignore;
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{
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printf_unfiltered ("\tUsing the running image of %s %s.\n",
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attach_flag ? "attached" : "child", target_pid_to_str (inferior_pid));
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}
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/* ARGSUSED */
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static void
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child_open (arg, from_tty)
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char *arg;
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int from_tty;
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{
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error ("Use the \"run\" command to start a Unix child process.");
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}
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/* Start an inferior win32 child process and sets inferior_pid to its pid.
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EXEC_FILE is the file to run.
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ALLARGS is a string containing the arguments to the program.
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ENV is the environment vector to pass. Errors reported with error(). */
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static void
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child_create_inferior (exec_file, allargs, env)
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char *exec_file;
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char *allargs;
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char **env;
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{
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char *real_path;
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STARTUPINFO si;
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PROCESS_INFORMATION pi;
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struct target_waitstatus dummy;
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BOOL ret;
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DWORD flags;
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char *args;
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if (!exec_file)
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{
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error ("No executable specified, use `target exec'.\n");
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}
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memset (&si, 0, sizeof (si));
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si.cb = sizeof (si);
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/* A realpath is always the same size, or a bit shorter than a nice path. */
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real_path = alloca (strlen (exec_file) + 1);
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path_to_real_path (exec_file, real_path);
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flags = DEBUG_ONLY_THIS_PROCESS | DEBUG_PROCESS;
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if (new_group)
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flags |= CREATE_NEW_PROCESS_GROUP;
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if (new_console)
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flags |= CREATE_NEW_CONSOLE;
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args = alloca (strlen (exec_file) + strlen (allargs) + 2);
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strcpy (args, exec_file);
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strcat (args, " ");
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strcat (args, allargs);
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ret = CreateProcess (real_path,
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args,
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NULL, /* Security */
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NULL, /* thread */
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TRUE, /* inherit handles */
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flags, /* start flags */
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env,
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NULL, /* current directory */
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&si,
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&pi);
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if (!ret)
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error ("Error creating process %s, (error %d)\n", exec_file, GetLastError());
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exception_count = 0;
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event_count = 0;
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inferior_pid = pi.dwProcessId;
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current_process = pi.hProcess;
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current_thread = pi.hThread;
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current_process_id = pi.dwProcessId;
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current_thread_id = pi.dwThreadId;
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push_target (&child_ops);
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init_thread_list ();
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init_wait_for_inferior ();
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clear_proceed_status ();
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target_terminal_init ();
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target_terminal_inferior ();
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/* Ignore the first trap */
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child_wait (inferior_pid, &dummy);
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proceed ((CORE_ADDR) - 1, TARGET_SIGNAL_0, 0);
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}
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static void
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child_mourn_inferior ()
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{
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unpush_target (&child_ops);
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generic_mourn_inferior ();
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}
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/* Send a SIGINT to the process group. This acts just like the user typed a
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^C on the controlling terminal. */
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void
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child_stop ()
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{
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CHECK (GenerateConsoleCtrlEvent (CTRL_C_EVENT, 0));
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}
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int
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child_xfer_memory (CORE_ADDR memaddr, char *our, int len,
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int write, struct target_ops *target)
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{
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DWORD done;
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if (write)
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{
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WriteProcessMemory (current_process, memaddr, our, len, &done);
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FlushInstructionCache (current_process, memaddr, len);
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}
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else
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{
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ReadProcessMemory (current_process, memaddr, our, len, &done);
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}
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return done;
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}
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void
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child_kill_inferior (void)
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{
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CHECK (TerminateProcess (current_process, 0));
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CHECK (CloseHandle (current_process));
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CHECK (CloseHandle (current_thread));
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}
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void
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child_resume (int pid, int step, enum target_signal signal)
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{
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DEBUG (("child_resume (%d, %d, %d);\n", pid, step, signal));
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if (step)
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{
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/* Single step by setting t bit */
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child_fetch_inferior_registers (PS_REGNUM);
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context.EFlags |= FLAG_TRACE_BIT;
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}
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if (context.ContextFlags)
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{
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CHECK (SetThreadContext (current_thread, &context));
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context.ContextFlags = 0;
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}
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if (signal)
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{
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fprintf_unfiltered (gdb_stderr, "Can't send signals to the child.\n");
|
|
}
|
|
|
|
CHECK (ContinueDebugEvent (current_process_id,
|
|
current_thread_id,
|
|
DBG_CONTINUE));
|
|
}
|
|
|
|
static void
|
|
child_prepare_to_store ()
|
|
{
|
|
/* Do nothing, since we can store individual regs */
|
|
}
|
|
|
|
static int
|
|
child_can_run ()
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
child_close ()
|
|
{
|
|
|
|
}
|
|
struct target_ops child_ops =
|
|
{
|
|
"child", /* to_shortname */
|
|
"Win32 child process", /* to_longname */
|
|
"Win32 child process (started by the \"run\" command).", /* to_doc */
|
|
child_open, /* to_open */
|
|
child_close, /* to_close */
|
|
child_attach, /* to_attach */
|
|
child_detach, /* to_detach */
|
|
child_resume, /* to_resume */
|
|
child_wait, /* to_wait */
|
|
child_fetch_inferior_registers,/* to_fetch_registers */
|
|
child_store_inferior_registers,/* to_store_registers */
|
|
child_prepare_to_store, /* to_child_prepare_to_store */
|
|
child_xfer_memory, /* to_xfer_memory */
|
|
child_files_info, /* to_files_info */
|
|
memory_insert_breakpoint, /* to_insert_breakpoint */
|
|
memory_remove_breakpoint, /* to_remove_breakpoint */
|
|
terminal_init_inferior, /* to_terminal_init */
|
|
terminal_inferior, /* to_terminal_inferior */
|
|
terminal_ours_for_output, /* to_terminal_ours_for_output */
|
|
terminal_ours, /* to_terminal_ours */
|
|
child_terminal_info, /* to_terminal_info */
|
|
child_kill_inferior, /* to_kill */
|
|
0, /* to_load */
|
|
0, /* to_lookup_symbol */
|
|
child_create_inferior, /* to_create_inferior */
|
|
child_mourn_inferior, /* to_mourn_inferior */
|
|
child_can_run, /* to_can_run */
|
|
0, /* to_notice_signals */
|
|
0, /* to_thread_alive */
|
|
child_stop, /* to_stop */
|
|
process_stratum, /* to_stratum */
|
|
0, /* to_next */
|
|
1, /* to_has_all_memory */
|
|
1, /* to_has_memory */
|
|
1, /* to_has_stack */
|
|
1, /* to_has_registers */
|
|
1, /* to_has_execution */
|
|
0, /* to_sections */
|
|
0, /* to_sections_end */
|
|
OPS_MAGIC /* to_magic */
|
|
};
|
|
|
|
void
|
|
_initialize_inftarg ()
|
|
{
|
|
add_show_from_set
|
|
(add_set_cmd ("new-console", class_support, var_boolean,
|
|
(char *) &new_console,
|
|
"Set creation of new console when creating child process.",
|
|
&setlist),
|
|
&showlist);
|
|
|
|
add_show_from_set
|
|
(add_set_cmd ("new-group", class_support, var_boolean,
|
|
(char *) &new_group,
|
|
"Set creation of new group when creating child process.",
|
|
&setlist),
|
|
&showlist);
|
|
|
|
add_target (&child_ops);
|
|
}
|