/* Target-vector operations for controlling windows child processes, for GDB.
- Copyright (C) 1995-2013 Free Software Foundation, Inc.
+ Copyright (C) 1995-2014 Free Software Foundation, Inc.
Contributed by Cygnus Solutions, A Red Hat Company.
#include <sys/cygwin.h>
#include <cygwin/version.h>
#endif
-#include <signal.h>
#include "buildsym.h"
#include "filenames.h"
if ((th = thread_rec (id, FALSE)))
return th;
- th = XZALLOC (thread_info);
+ th = XCNEW (thread_info);
th->id = id;
th->h = h;
th->thread_local_base = (CORE_ADDR) (uintptr_t) tlb;
#endif
}
#endif
- so = XZALLOC (struct so_list);
+ so = XCNEW (struct so_list);
so->lm_info = (struct lm_info *) xmalloc (sizeof (struct lm_info));
so->lm_info->load_addr = load_addr;
strcpy (so->so_original_name, name);
dll_buf[0] = dll_buf[sizeof (dll_buf) - 1] = '\0';
+ /* Try getting the DLL name by searching the list of known modules
+ and matching their base address against this new DLL's base address.
+
+ FIXME: brobecker/2013-12-10:
+ It seems odd to be going through this search if the DLL name could
+ simply be extracted via "event->lpImageName". Moreover, some
+ experimentation with various versions of Windows seem to indicate
+ that it might still be too early for this DLL to be listed when
+ querying the system about the current list of modules, thus making
+ this attempt pointless.
+
+ This code can therefore probably be removed. But at the time of
+ this writing, we are too close to creating the GDB 7.7 branch
+ for us to make such a change. We are therefore defering it. */
+
if (!get_module_name (event->lpBaseOfDll, dll_buf))
dll_buf[0] = dll_buf[sizeof (dll_buf) - 1] = '\0';
dll_name = dll_buf;
+ /* Try getting the DLL name via the lpImageName field of the event.
+ Note that Microsoft documents this fields as strictly optional,
+ in the sense that it might be NULL. And the first DLL event in
+ particular is explicitly documented as "likely not pass[ed]"
+ (source: MSDN LOAD_DLL_DEBUG_INFO structure). */
if (*dll_name == '\0')
dll_name = get_image_name (current_process_handle,
event->lpImageName, event->fUnicode);
}
}
+/* On certain versions of Windows, the information about ntdll.dll
+ is not available yet at the time we get the LOAD_DLL_DEBUG_EVENT,
+ thus preventing us from reporting this DLL as an SO. This has been
+ witnessed on Windows 8.1, for instance. A possible explanation
+ is that ntdll.dll might be mapped before the SO info gets created
+ by the Windows system -- ntdll.dll is the first DLL to be reported
+ via LOAD_DLL_DEBUG_EVENT and other DLLs do not seem to suffer from
+ that problem.
+
+ If we indeed are missing ntdll.dll, this function tries to recover
+ from this issue, after the fact. Do nothing if we encounter any
+ issue trying to locate that DLL. */
+
+static void
+windows_ensure_ntdll_loaded (void)
+{
+ struct so_list *so;
+ HMODULE dummy_hmodule;
+ DWORD cb_needed;
+ HMODULE *hmodules;
+ int i;
+
+ for (so = solib_start.next; so != NULL; so = so->next)
+ if (FILENAME_CMP (lbasename (so->so_name), "ntdll.dll") == 0)
+ return; /* ntdll.dll already loaded, nothing to do. */
+
+ if (EnumProcessModules (current_process_handle, &dummy_hmodule,
+ sizeof (HMODULE), &cb_needed) == 0)
+ return;
+
+ if (cb_needed < 1)
+ return;
+
+ hmodules = (HMODULE *) alloca (cb_needed);
+ if (EnumProcessModules (current_process_handle, hmodules,
+ cb_needed, &cb_needed) == 0)
+ return;
+
+ for (i = 0; i < (int) (cb_needed / sizeof (HMODULE)); i++)
+ {
+ MODULEINFO mi;
+#ifdef __USEWIDE
+ wchar_t dll_name[__PMAX];
+ char name[__PMAX];
+#else
+ char dll_name[__PMAX];
+ char *name;
+#endif
+ if (GetModuleInformation (current_process_handle, hmodules[i],
+ &mi, sizeof (mi)) == 0)
+ continue;
+ if (GetModuleFileNameEx (current_process_handle, hmodules[i],
+ dll_name, sizeof (dll_name)) == 0)
+ continue;
+#ifdef __USEWIDE
+ wcstombs (name, dll_name, __PMAX);
+#else
+ name = dll_name;
+#endif
+ if (FILENAME_CMP (lbasename (name), "ntdll.dll") == 0)
+ {
+ solib_end->next = windows_make_so (name, mi.lpBaseOfDll);
+ solib_end = solib_end->next;
+ return;
+ }
+ }
+}
+
static void
do_initial_windows_stuff (struct target_ops *ops, DWORD pid, int attaching)
{
break;
}
+ /* FIXME: brobecker/2013-12-10: We should try another approach where
+ we first ignore all DLL load/unload events up until this point,
+ and then iterate over all modules to create the associated shared
+ objects. This is a fairly significant change, however, and we are
+ close to creating a release branch, so we are delaying it a bit,
+ after the branch is created. */
+ windows_ensure_ntdll_loaded ();
+
windows_initialization_done = 1;
inf->control.stop_soon = NO_STOP_QUIETLY;
stop_after_trap = 0;
/* Helper for windows_xfer_partial that handles memory transfers.
Arguments are like target_xfer_partial. */
-static LONGEST
+static enum target_xfer_status
windows_xfer_memory (gdb_byte *readbuf, const gdb_byte *writebuf,
- ULONGEST memaddr, LONGEST len)
+ ULONGEST memaddr, ULONGEST len, ULONGEST *xfered_len)
{
SIZE_T done = 0;
BOOL success;
if (writebuf != NULL)
{
DEBUG_MEM (("gdb: write target memory, %s bytes at %s\n",
- plongest (len), core_addr_to_string (memaddr)));
+ pulongest (len), core_addr_to_string (memaddr)));
success = WriteProcessMemory (current_process_handle,
(LPVOID) (uintptr_t) memaddr, writebuf,
len, &done);
else
{
DEBUG_MEM (("gdb: read target memory, %s bytes at %s\n",
- plongest (len), core_addr_to_string (memaddr)));
+ pulongest (len), core_addr_to_string (memaddr)));
success = ReadProcessMemory (current_process_handle,
(LPCVOID) (uintptr_t) memaddr, readbuf,
len, &done);
if (!success)
lasterror = GetLastError ();
}
+ *xfered_len = (ULONGEST) done;
if (!success && lasterror == ERROR_PARTIAL_COPY && done > 0)
- return done;
+ return TARGET_XFER_OK;
else
- return success ? done : TARGET_XFER_E_IO;
+ return success ? TARGET_XFER_OK : TARGET_XFER_E_IO;
}
static void
}
static void
-windows_prepare_to_store (struct regcache *regcache)
+windows_prepare_to_store (struct target_ops *self, struct regcache *regcache)
{
/* Do nothing, since we can store individual regs. */
}
return normal_pid_to_str (ptid);
}
-static LONGEST
+static enum target_xfer_status
windows_xfer_shared_libraries (struct target_ops *ops,
- enum target_object object, const char *annex,
- gdb_byte *readbuf, const gdb_byte *writebuf,
- ULONGEST offset, LONGEST len)
+ enum target_object object, const char *annex,
+ gdb_byte *readbuf, const gdb_byte *writebuf,
+ ULONGEST offset, ULONGEST len,
+ ULONGEST *xfered_len)
{
struct obstack obstack;
const char *buf;
struct so_list *so;
if (writebuf)
- return -1;
+ return TARGET_XFER_E_IO;
obstack_init (&obstack);
obstack_grow_str (&obstack, "<library-list>\n");
}
obstack_free (&obstack, NULL);
- return len;
+ *xfered_len = (ULONGEST) len;
+ return TARGET_XFER_OK;
}
-static LONGEST
+static enum target_xfer_status
windows_xfer_partial (struct target_ops *ops, enum target_object object,
- const char *annex, gdb_byte *readbuf,
- const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
+ const char *annex, gdb_byte *readbuf,
+ const gdb_byte *writebuf, ULONGEST offset, ULONGEST len,
+ ULONGEST *xfered_len)
{
switch (object)
{
case TARGET_OBJECT_MEMORY:
- return windows_xfer_memory (readbuf, writebuf, offset, len);
+ return windows_xfer_memory (readbuf, writebuf, offset, len, xfered_len);
case TARGET_OBJECT_LIBRARIES:
return windows_xfer_shared_libraries (ops, object, annex, readbuf,
- writebuf, offset, len);
+ writebuf, offset, len, xfered_len);
default:
if (ops->beneath != NULL)
return ops->beneath->to_xfer_partial (ops->beneath, object, annex,
- readbuf, writebuf, offset, len);
- return -1;
+ readbuf, writebuf, offset, len,
+ xfered_len);
+ return TARGET_XFER_E_IO;
}
}
projects / deliverable / binutils-gdb.git / blobdiff