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| author | Hannes Domani <ssbssa@yahoo.de> | 2020-01-17 15:28:09 +0100 |
|---|---|---|
| committer | Hannes Domani <ssbssa@yahoo.de> | 2020-02-09 12:14:51 +0100 |
| commit | 7928d571c5f742a10d98b0de0ef85284c5959845 (patch) | |
| tree | 3a728942f516e96dc543fc73b17b848f7aa9849d /gdbserver | |
| parent | 98d3eb9390ef5eca14200c424f22812982c06b19 (diff) | |
| download | gdb-7928d571c5f742a10d98b0de0ef85284c5959845.zip gdb-7928d571c5f742a10d98b0de0ef85284c5959845.tar.gz gdb-7928d571c5f742a10d98b0de0ef85284c5959845.tar.bz2 | |
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.
Diffstat (limited to 'gdbserver')
| -rw-r--r-- | gdbserver/ChangeLog | 6 | ||||
| -rw-r--r-- | gdbserver/win32-low.c | 30 |
2 files changed, 35 insertions, 1 deletions
diff --git a/gdbserver/ChangeLog b/gdbserver/ChangeLog index a1d6e2a..4f3e8cb 100644 --- a/gdbserver/ChangeLog +++ b/gdbserver/ChangeLog @@ -1,3 +1,9 @@ +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. + 2020-02-07 Tom Tromey <tom@tromey.com> Pedro Alves <palves@redhat.com> diff --git a/gdbserver/win32-low.c b/gdbserver/win32-low.c index 2c4a9b1..9d03437 100644 --- a/gdbserver/win32-low.c +++ b/gdbserver/win32-low.c @@ -75,6 +75,7 @@ static int attaching = 0; static HANDLE current_process_handle = NULL; static DWORD current_process_id = 0; static DWORD main_thread_id = 0; +static EXCEPTION_RECORD siginfo_er; /* Contents of $_siginfo */ static enum gdb_signal last_sig = GDB_SIGNAL_0; /* The current debug event from WaitForDebugEvent. */ @@ -801,6 +802,7 @@ win32_clear_inferiors (void) CloseHandle (current_process_handle); for_each_thread (delete_thread_info); + siginfo_er.ExceptionCode = 0; clear_inferiors (); } @@ -1230,6 +1232,9 @@ handle_exception (struct target_waitstatus *ourstatus) { DWORD code = current_event.u.Exception.ExceptionRecord.ExceptionCode; + memcpy (&siginfo_er, ¤t_event.u.Exception.ExceptionRecord, + sizeof siginfo_er); + ourstatus->kind = TARGET_WAITKIND_STOPPED; switch (code) @@ -1772,6 +1777,29 @@ wince_hostio_last_error (char *buf) } #endif +/* Write Windows signal info. */ + +static int +win32_xfer_siginfo (const char *annex, unsigned char *readbuf, + unsigned const char *writebuf, CORE_ADDR offset, int len) +{ + if (siginfo_er.ExceptionCode == 0) + return -1; + + if (readbuf == nullptr) + return -1; + + if (offset > sizeof (siginfo_er)) + return -1; + + if (offset + len > sizeof (siginfo_er)) + len = sizeof (siginfo_er) - offset; + + memcpy (readbuf, (char *) &siginfo_er + offset, len); + + return len; +} + /* Write Windows OS Thread Information Block address. */ static int @@ -1833,7 +1861,7 @@ static process_stratum_target win32_target_ops = { hostio_last_error_from_errno, #endif NULL, /* qxfer_osdata */ - NULL, /* qxfer_siginfo */ + win32_xfer_siginfo, NULL, /* supports_non_stop */ NULL, /* async */ NULL, /* start_non_stop */ |