Display ExceptionRecord for $_siginfo
Uses the $_siginfo convenience variable to show the last exception.
The type looks like this:
(gdb) pt $_siginfo
type = struct EXCEPTION_RECORD {
DWORD ExceptionCode;
DWORD ExceptionFlags;
struct EXCEPTION_RECORD *ExceptionRecord;
PVOID ExceptionAddress;
DWORD NumberParameters;
ULONG_PTR ExceptionInformation[15];
}
EXCEPTION_RECORD is documented at [1].
Example:
Program received signal SIGSEGV, Segmentation fault.
main () at crasher.c:4
4 *(int*)0x123 = 0;
(gdb) p $_siginfo
$1 = {
ExceptionCode = 3221225477,
ExceptionFlags = 0,
ExceptionRecord = 0x0,
ExceptionAddress = 0x401632 <main+18>,
NumberParameters = 2,
ExceptionInformation = {1, 291, 0 <repeats 13 times>}
}
(gdb) p/x $_siginfo.ExceptionCode
$2 = 0xc0000005
(gdb) p/x $_siginfo.ExceptionInformation[1]
$3 = 0x123
And 0xc0000005 is the value of EXCEPTION_ACCESS_VIOLATION.
[1] https://docs.microsoft.com/en-us/windows/win32/api/winnt/ns-winnt-exception_record
gdb/ChangeLog:
2020-02-09 Hannes Domani <ssbssa@yahoo.de>
* NEWS: Mention $_siginfo support for Windows.
* windows-nat.c (handle_exception): Set siginfo_er.
(windows_nat_target::mourn_inferior): Reset siginfo_er.
(windows_xfer_siginfo): New function.
(windows_nat_target::xfer_partial): Call windows_xfer_siginfo.
* windows-tdep.c (struct windows_gdbarch_data): New struct.
(init_windows_gdbarch_data): New function.
(get_windows_gdbarch_data): New function.
(windows_get_siginfo_type): New function.
(windows_init_abi): Register windows_get_siginfo_type.
(_initialize_windows_tdep): Register init_windows_gdbarch_data.
gdbserver/ChangeLog:
2020-02-09 Hannes Domani <ssbssa@yahoo.de>
* win32-low.c (win32_clear_inferiors): Reset siginfo_er.
(handle_exception): Set siginfo_er.
(win32_xfer_siginfo): New function.
This commit is contained in:
Hannes Domani
parent
98d3eb9390
commit
7928d571c5
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@ -1,3 +1,17 @@
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2020-02-09 Hannes Domani <ssbssa@yahoo.de>
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* NEWS: Mention $_siginfo support for Windows.
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* windows-nat.c (handle_exception): Set siginfo_er.
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(windows_nat_target::mourn_inferior): Reset siginfo_er.
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(windows_xfer_siginfo): New function.
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(windows_nat_target::xfer_partial): Call windows_xfer_siginfo.
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* windows-tdep.c (struct windows_gdbarch_data): New struct.
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(init_windows_gdbarch_data): New function.
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(get_windows_gdbarch_data): New function.
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(windows_get_siginfo_type): New function.
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(windows_init_abi): Register windows_get_siginfo_type.
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(_initialize_windows_tdep): Register init_windows_gdbarch_data.
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2020-02-08 Tom Tromey <tom@tromey.com>
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* dwarf2/read.c (class cutu_reader) <cutu_reader,
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3
gdb/NEWS
3
gdb/NEWS
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@ -10,6 +10,9 @@
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that support it (see entry for GDB 9, below), providing faster
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performance for programs with many symbols.
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* The $_siginfo convenience variable now also works on Windows targets,
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and will display the EXCEPTION_RECORD of the last handled exception.
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* New commands
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set exec-file-mismatch -- Set exec-file-mismatch handling (ask|warn|off).
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@ -236,6 +236,7 @@ static DEBUG_EVENT current_event; /* The current debug event from
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WaitForDebugEvent */
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static HANDLE current_process_handle; /* Currently executing process */
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static windows_thread_info *current_thread; /* Info on currently selected thread */
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static EXCEPTION_RECORD siginfo_er; /* Contents of $_siginfo */
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/* Counts of things. */
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static int exception_count = 0;
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@ -1167,6 +1168,8 @@ handle_exception (struct target_waitstatus *ourstatus)
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DWORD code = rec->ExceptionCode;
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handle_exception_result result = HANDLE_EXCEPTION_HANDLED;
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memcpy (&siginfo_er, rec, sizeof siginfo_er);
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ourstatus->kind = TARGET_WAITKIND_STOPPED;
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/* Record the context of the current thread. */
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@ -2863,6 +2866,7 @@ windows_nat_target::mourn_inferior ()
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CHECK (CloseHandle (current_process_handle));
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open_process_used = 0;
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}
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siginfo_er.ExceptionCode = 0;
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inf_child_target::mourn_inferior ();
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}
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@ -2996,6 +3000,30 @@ windows_xfer_shared_libraries (struct target_ops *ops,
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return len != 0 ? TARGET_XFER_OK : TARGET_XFER_EOF;
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}
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/* Helper for windows_nat_target::xfer_partial that handles signal info. */
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static enum target_xfer_status
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windows_xfer_siginfo (gdb_byte *readbuf, ULONGEST offset, ULONGEST len,
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ULONGEST *xfered_len)
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{
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if (siginfo_er.ExceptionCode == 0)
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return TARGET_XFER_E_IO;
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if (readbuf == nullptr)
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return TARGET_XFER_E_IO;
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if (offset > sizeof (siginfo_er))
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return TARGET_XFER_E_IO;
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if (offset + len > sizeof (siginfo_er))
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len = sizeof (siginfo_er) - offset;
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memcpy (readbuf, (char *) &siginfo_er + offset, len);
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*xfered_len = len;
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return TARGET_XFER_OK;
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}
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enum target_xfer_status
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windows_nat_target::xfer_partial (enum target_object object,
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const char *annex, gdb_byte *readbuf,
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@ -3011,6 +3039,9 @@ windows_nat_target::xfer_partial (enum target_object object,
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return windows_xfer_shared_libraries (this, object, annex, readbuf,
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writebuf, offset, len, xfered_len);
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case TARGET_OBJECT_SIGNAL_INFO:
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return windows_xfer_siginfo (readbuf, offset, len, xfered_len);
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default:
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if (beneath () == NULL)
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{
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@ -153,6 +153,30 @@ static const int FULL_TIB_SIZE = 0x1000;
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static bool maint_display_all_tib = false;
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static struct gdbarch_data *windows_gdbarch_data_handle;
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struct windows_gdbarch_data
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{
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struct type *siginfo_type;
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};
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/* Allocate windows_gdbarch_data for an arch. */
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static void *
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init_windows_gdbarch_data (struct gdbarch *gdbarch)
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{
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return GDBARCH_OBSTACK_ZALLOC (gdbarch, struct windows_gdbarch_data);
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}
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/* Get windows_gdbarch_data of an arch. */
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static struct windows_gdbarch_data *
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get_windows_gdbarch_data (struct gdbarch *gdbarch)
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{
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return ((struct windows_gdbarch_data *)
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gdbarch_data (gdbarch, windows_gdbarch_data_handle));
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}
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/* Define Thread Local Base pointer type. */
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static struct type *
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@ -656,6 +680,49 @@ windows_gdb_signal_to_target (struct gdbarch *gdbarch, enum gdb_signal signal)
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return -1;
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}
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/* Implement the "get_siginfo_type" gdbarch method. */
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static struct type *
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windows_get_siginfo_type (struct gdbarch *gdbarch)
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{
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struct windows_gdbarch_data *windows_gdbarch_data;
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struct type *dword_type, *pvoid_type, *ulongptr_type;
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struct type *siginfo_ptr_type, *siginfo_type;
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windows_gdbarch_data = get_windows_gdbarch_data (gdbarch);
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if (windows_gdbarch_data->siginfo_type != NULL)
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return windows_gdbarch_data->siginfo_type;
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dword_type = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch),
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1, "DWORD");
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pvoid_type = arch_pointer_type (gdbarch, gdbarch_ptr_bit (gdbarch), "PVOID",
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builtin_type (gdbarch)->builtin_void);
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ulongptr_type = arch_integer_type (gdbarch, gdbarch_ptr_bit (gdbarch),
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1, "ULONG_PTR");
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siginfo_type = arch_composite_type (gdbarch, "EXCEPTION_RECORD",
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TYPE_CODE_STRUCT);
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siginfo_ptr_type = arch_pointer_type (gdbarch, gdbarch_ptr_bit (gdbarch),
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NULL, siginfo_type);
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append_composite_type_field (siginfo_type, "ExceptionCode", dword_type);
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append_composite_type_field (siginfo_type, "ExceptionFlags", dword_type);
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append_composite_type_field (siginfo_type, "ExceptionRecord",
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siginfo_ptr_type);
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append_composite_type_field (siginfo_type, "ExceptionAddress",
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pvoid_type);
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append_composite_type_field (siginfo_type, "NumberParameters", dword_type);
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/* The 64-bit variant needs some padding. */
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append_composite_type_field_aligned (siginfo_type, "ExceptionInformation",
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lookup_array_range_type (ulongptr_type,
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0, 14),
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TYPE_LENGTH (ulongptr_type));
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windows_gdbarch_data->siginfo_type = siginfo_type;
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return siginfo_type;
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}
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/* To be called from the various GDB_OSABI_CYGWIN handlers for the
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various Windows architectures and machine types. */
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@ -675,6 +742,8 @@ windows_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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set_gdbarch_gdb_signal_to_target (gdbarch, windows_gdb_signal_to_target);
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set_solib_ops (gdbarch, &solib_target_so_ops);
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set_gdbarch_get_siginfo_type (gdbarch, windows_get_siginfo_type);
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}
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/* Implementation of `tlb' variable. */
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@ -690,6 +759,9 @@ void _initialize_windows_tdep ();
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void
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_initialize_windows_tdep ()
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{
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windows_gdbarch_data_handle
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= gdbarch_data_register_post_init (init_windows_gdbarch_data);
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init_w32_command_list ();
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add_cmd ("thread-information-block", class_info, display_tib,
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_("Display thread information block."),
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@ -1,3 +1,9 @@
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2020-02-09 Hannes Domani <ssbssa@yahoo.de>
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* win32-low.c (win32_clear_inferiors): Reset siginfo_er.
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(handle_exception): Set siginfo_er.
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(win32_xfer_siginfo): New function.
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2020-02-07 Tom Tromey <tom@tromey.com>
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Pedro Alves <palves@redhat.com>
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@ -75,6 +75,7 @@ static int attaching = 0;
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static HANDLE current_process_handle = NULL;
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static DWORD current_process_id = 0;
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static DWORD main_thread_id = 0;
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static EXCEPTION_RECORD siginfo_er; /* Contents of $_siginfo */
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static enum gdb_signal last_sig = GDB_SIGNAL_0;
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/* The current debug event from WaitForDebugEvent. */
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@ -801,6 +802,7 @@ win32_clear_inferiors (void)
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CloseHandle (current_process_handle);
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for_each_thread (delete_thread_info);
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siginfo_er.ExceptionCode = 0;
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clear_inferiors ();
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}
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@ -1230,6 +1232,9 @@ handle_exception (struct target_waitstatus *ourstatus)
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{
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DWORD code = current_event.u.Exception.ExceptionRecord.ExceptionCode;
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memcpy (&siginfo_er, ¤t_event.u.Exception.ExceptionRecord,
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sizeof siginfo_er);
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ourstatus->kind = TARGET_WAITKIND_STOPPED;
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switch (code)
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@ -1772,6 +1777,29 @@ wince_hostio_last_error (char *buf)
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}
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#endif
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/* Write Windows signal info. */
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static int
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win32_xfer_siginfo (const char *annex, unsigned char *readbuf,
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unsigned const char *writebuf, CORE_ADDR offset, int len)
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{
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if (siginfo_er.ExceptionCode == 0)
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return -1;
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if (readbuf == nullptr)
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return -1;
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if (offset > sizeof (siginfo_er))
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return -1;
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if (offset + len > sizeof (siginfo_er))
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len = sizeof (siginfo_er) - offset;
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memcpy (readbuf, (char *) &siginfo_er + offset, len);
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return len;
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}
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/* Write Windows OS Thread Information Block address. */
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static int
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@ -1833,7 +1861,7 @@ static process_stratum_target win32_target_ops = {
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hostio_last_error_from_errno,
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#endif
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NULL, /* qxfer_osdata */
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NULL, /* qxfer_siginfo */
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win32_xfer_siginfo,
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NULL, /* supports_non_stop */
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NULL, /* async */
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NULL, /* start_non_stop */
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Loading…
Reference in New Issue