#include "gdbsupport/gdb_wait.h"
#include "nat/windows-nat.h"
-#define STATUS_WX86_BREAKPOINT 0x4000001F
-#define STATUS_WX86_SINGLE_STEP 0x4000001E
-
using namespace windows_nat;
#define AdjustTokenPrivileges dyn_AdjustTokenPrivileges
static int windows_initialization_done;
#define DR6_CLEAR_VALUE 0xffff0ff0
-/* The exception thrown by a program to tell the debugger the name of
- a thread. The exception record contains an ID of a thread and a
- name to give it. This exception has no documented name, but MSDN
- dubs it "MS_VC_EXCEPTION" in one code example. */
-#define MS_VC_EXCEPTION 0x406d1388
-
-typedef enum
-{
- HANDLE_EXCEPTION_UNHANDLED = 0,
- HANDLE_EXCEPTION_HANDLED,
- HANDLE_EXCEPTION_IGNORED
-} handle_exception_result;
-
/* The string sent by cygwin when it processes a signal.
FIXME: This should be in a cygwin include file. */
#ifndef _CYGWIN_SIGNAL_STRING
#endif
#define CHECK(x) check (x, __FILE__,__LINE__)
-#define DEBUG_EXEC(x) if (debug_exec) printf_unfiltered x
-#define DEBUG_EVENTS(x) if (debug_events) printf_unfiltered x
-#define DEBUG_MEM(x) if (debug_memory) printf_unfiltered x
-#define DEBUG_EXCEPT(x) if (debug_exceptions) printf_unfiltered x
+#define DEBUG_EXEC(x) if (debug_exec) debug_printf x
+#define DEBUG_EVENTS(x) if (debug_events) debug_printf x
+#define DEBUG_MEM(x) if (debug_memory) debug_printf x
+#define DEBUG_EXCEPT(x) if (debug_exceptions) debug_printf x
static void cygwin_set_dr (int i, CORE_ADDR addr);
static void cygwin_set_dr7 (unsigned long val);
static int open_process_used = 0;
#ifdef __x86_64__
static bool wow64_process = false;
-static bool ignore_first_breakpoint = false;
#endif
/* User options. */
else
{
if (th->stopped_at_software_breakpoint
+ && !th->pc_adjusted
&& r == gdbarch_pc_regnum (gdbarch))
{
int size = register_size (gdbarch, r);
value -= gdbarch_decr_pc_after_break (gdbarch);
memcpy (context_offset, &value, size);
}
+ /* Make sure we only rewrite the PC a single time. */
+ th->pc_adjusted = true;
}
regcache->raw_supply (r, context_offset);
}
free (rname);
}
else
- error (_("dll path too long"));
+ {
+ warning (_("dll path for \"%s\" too long or inaccessible"), name);
+ strcpy (so->so_name, so->so_original_name);
+ }
}
/* Record cygwin1.dll .text start/end. */
p = strchr (so->so_name, '\0') - (sizeof ("/cygwin1.dll") - 1);
{
asection *text = NULL;
- gdb_bfd_ref_ptr abfd (gdb_bfd_open (so->so_name, "pei-i386", -1));
+ gdb_bfd_ref_ptr abfd (gdb_bfd_open (so->so_name, "pei-i386"));
if (abfd == NULL)
return so;
}
}
-#define DEBUG_EXCEPTION_SIMPLE(x) if (debug_exceptions) \
- printf_unfiltered ("gdb: Target exception %s at %s\n", x, \
- host_address_to_string (\
- current_event.u.Exception.ExceptionRecord.ExceptionAddress))
+/* See nat/windows-nat.h. */
-static handle_exception_result
-handle_exception (struct target_waitstatus *ourstatus)
+bool
+windows_nat::handle_ms_vc_exception (const EXCEPTION_RECORD *rec)
{
- EXCEPTION_RECORD *rec = ¤t_event.u.Exception.ExceptionRecord;
- DWORD code = rec->ExceptionCode;
- handle_exception_result result = HANDLE_EXCEPTION_HANDLED;
-
- memcpy (&siginfo_er, rec, sizeof siginfo_er);
-
- ourstatus->kind = TARGET_WAITKIND_STOPPED;
-
- /* Record the context of the current thread. */
- thread_rec (ptid_t (current_event.dwProcessId, current_event.dwThreadId, 0),
- DONT_SUSPEND);
-
- switch (code)
+ if (rec->NumberParameters >= 3
+ && (rec->ExceptionInformation[0] & 0xffffffff) == 0x1000)
{
- case EXCEPTION_ACCESS_VIOLATION:
- DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_ACCESS_VIOLATION");
- ourstatus->value.sig = GDB_SIGNAL_SEGV;
-#ifdef __CYGWIN__
- {
- /* See if the access violation happened within the cygwin DLL
- itself. Cygwin uses a kind of exception handling to deal
- with passed-in invalid addresses. gdb should not treat
- these as real SEGVs since they will be silently handled by
- cygwin. A real SEGV will (theoretically) be caught by
- cygwin later in the process and will be sent as a
- cygwin-specific-signal. So, ignore SEGVs if they show up
- within the text segment of the DLL itself. */
- const char *fn;
- CORE_ADDR addr = (CORE_ADDR) (uintptr_t) rec->ExceptionAddress;
-
- if ((!cygwin_exceptions && (addr >= cygwin_load_start
- && addr < cygwin_load_end))
- || (find_pc_partial_function (addr, &fn, NULL, NULL)
- && startswith (fn, "KERNEL32!IsBad")))
- return HANDLE_EXCEPTION_UNHANDLED;
- }
-#endif
- break;
- case STATUS_STACK_OVERFLOW:
- DEBUG_EXCEPTION_SIMPLE ("STATUS_STACK_OVERFLOW");
- ourstatus->value.sig = GDB_SIGNAL_SEGV;
- break;
- case STATUS_FLOAT_DENORMAL_OPERAND:
- DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_DENORMAL_OPERAND");
- ourstatus->value.sig = GDB_SIGNAL_FPE;
- break;
- case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
- DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_ARRAY_BOUNDS_EXCEEDED");
- ourstatus->value.sig = GDB_SIGNAL_FPE;
- break;
- case STATUS_FLOAT_INEXACT_RESULT:
- DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_INEXACT_RESULT");
- ourstatus->value.sig = GDB_SIGNAL_FPE;
- break;
- case STATUS_FLOAT_INVALID_OPERATION:
- DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_INVALID_OPERATION");
- ourstatus->value.sig = GDB_SIGNAL_FPE;
- break;
- case STATUS_FLOAT_OVERFLOW:
- DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_OVERFLOW");
- ourstatus->value.sig = GDB_SIGNAL_FPE;
- break;
- case STATUS_FLOAT_STACK_CHECK:
- DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_STACK_CHECK");
- ourstatus->value.sig = GDB_SIGNAL_FPE;
- break;
- case STATUS_FLOAT_UNDERFLOW:
- DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_UNDERFLOW");
- ourstatus->value.sig = GDB_SIGNAL_FPE;
- break;
- case STATUS_FLOAT_DIVIDE_BY_ZERO:
- DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_DIVIDE_BY_ZERO");
- ourstatus->value.sig = GDB_SIGNAL_FPE;
- break;
- case STATUS_INTEGER_DIVIDE_BY_ZERO:
- DEBUG_EXCEPTION_SIMPLE ("STATUS_INTEGER_DIVIDE_BY_ZERO");
- ourstatus->value.sig = GDB_SIGNAL_FPE;
- break;
- case STATUS_INTEGER_OVERFLOW:
- DEBUG_EXCEPTION_SIMPLE ("STATUS_INTEGER_OVERFLOW");
- ourstatus->value.sig = GDB_SIGNAL_FPE;
- break;
- case EXCEPTION_BREAKPOINT:
-#ifdef __x86_64__
- if (ignore_first_breakpoint)
- {
- /* For WOW64 processes, there are always 2 breakpoint exceptions
- on startup, first a BREAKPOINT for the 64bit ntdll.dll,
- then a WX86_BREAKPOINT for the 32bit ntdll.dll.
- Here we only care about the WX86_BREAKPOINT's. */
- ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
- ignore_first_breakpoint = false;
- }
-#endif
- /* FALLTHROUGH */
- case STATUS_WX86_BREAKPOINT:
- DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_BREAKPOINT");
- ourstatus->value.sig = GDB_SIGNAL_TRAP;
- break;
- case DBG_CONTROL_C:
- DEBUG_EXCEPTION_SIMPLE ("DBG_CONTROL_C");
- ourstatus->value.sig = GDB_SIGNAL_INT;
- break;
- case DBG_CONTROL_BREAK:
- DEBUG_EXCEPTION_SIMPLE ("DBG_CONTROL_BREAK");
- ourstatus->value.sig = GDB_SIGNAL_INT;
- break;
- case EXCEPTION_SINGLE_STEP:
- case STATUS_WX86_SINGLE_STEP:
- DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_SINGLE_STEP");
- ourstatus->value.sig = GDB_SIGNAL_TRAP;
- break;
- case EXCEPTION_ILLEGAL_INSTRUCTION:
- DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_ILLEGAL_INSTRUCTION");
- ourstatus->value.sig = GDB_SIGNAL_ILL;
- break;
- case EXCEPTION_PRIV_INSTRUCTION:
- DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_PRIV_INSTRUCTION");
- ourstatus->value.sig = GDB_SIGNAL_ILL;
- break;
- case EXCEPTION_NONCONTINUABLE_EXCEPTION:
- DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_NONCONTINUABLE_EXCEPTION");
- ourstatus->value.sig = GDB_SIGNAL_ILL;
- break;
- case MS_VC_EXCEPTION:
- if (rec->NumberParameters >= 3
- && (rec->ExceptionInformation[0] & 0xffffffff) == 0x1000)
- {
- DWORD named_thread_id;
- windows_thread_info *named_thread;
- CORE_ADDR thread_name_target;
+ DWORD named_thread_id;
+ windows_thread_info *named_thread;
+ CORE_ADDR thread_name_target;
- DEBUG_EXCEPTION_SIMPLE ("MS_VC_EXCEPTION");
+ thread_name_target = rec->ExceptionInformation[1];
+ named_thread_id = (DWORD) (0xffffffff & rec->ExceptionInformation[2]);
- thread_name_target = rec->ExceptionInformation[1];
- named_thread_id = (DWORD) (0xffffffff & rec->ExceptionInformation[2]);
+ if (named_thread_id == (DWORD) -1)
+ named_thread_id = current_event.dwThreadId;
- if (named_thread_id == (DWORD) -1)
- named_thread_id = current_event.dwThreadId;
+ named_thread = thread_rec (ptid_t (current_event.dwProcessId,
+ named_thread_id, 0),
+ DONT_INVALIDATE_CONTEXT);
+ if (named_thread != NULL)
+ {
+ int thread_name_len;
+ gdb::unique_xmalloc_ptr<char> thread_name;
- named_thread = thread_rec (ptid_t (current_event.dwProcessId,
- named_thread_id, 0),
- DONT_INVALIDATE_CONTEXT);
- if (named_thread != NULL)
+ thread_name_len = target_read_string (thread_name_target,
+ &thread_name, 1025, NULL);
+ if (thread_name_len > 0)
{
- int thread_name_len;
- gdb::unique_xmalloc_ptr<char> thread_name;
-
- thread_name_len = target_read_string (thread_name_target,
- &thread_name, 1025, NULL);
- if (thread_name_len > 0)
- {
- thread_name.get ()[thread_name_len - 1] = '\0';
- named_thread->name = std::move (thread_name);
- }
+ thread_name.get ()[thread_name_len - 1] = '\0';
+ named_thread->name = std::move (thread_name);
}
- ourstatus->value.sig = GDB_SIGNAL_TRAP;
- result = HANDLE_EXCEPTION_IGNORED;
- break;
}
- /* treat improperly formed exception as unknown */
- /* FALLTHROUGH */
- default:
- /* Treat unhandled first chance exceptions specially. */
- if (current_event.u.Exception.dwFirstChance)
- return HANDLE_EXCEPTION_UNHANDLED;
- printf_unfiltered ("gdb: unknown target exception 0x%08x at %s\n",
- (unsigned) current_event.u.Exception.ExceptionRecord.ExceptionCode,
- host_address_to_string (
- current_event.u.Exception.ExceptionRecord.ExceptionAddress));
- ourstatus->value.sig = GDB_SIGNAL_UNKNOWN;
- break;
+
+ return true;
}
- last_sig = ourstatus->value.sig;
- return result;
+
+ return false;
+}
+
+/* See nat/windows-nat.h. */
+
+bool
+windows_nat::handle_access_violation (const EXCEPTION_RECORD *rec)
+{
+#ifdef __CYGWIN__
+ /* See if the access violation happened within the cygwin DLL
+ itself. Cygwin uses a kind of exception handling to deal with
+ passed-in invalid addresses. gdb should not treat these as real
+ SEGVs since they will be silently handled by cygwin. A real SEGV
+ will (theoretically) be caught by cygwin later in the process and
+ will be sent as a cygwin-specific-signal. So, ignore SEGVs if
+ they show up within the text segment of the DLL itself. */
+ const char *fn;
+ CORE_ADDR addr = (CORE_ADDR) (uintptr_t) rec->ExceptionAddress;
+
+ if ((!cygwin_exceptions && (addr >= cygwin_load_start
+ && addr < cygwin_load_end))
+ || (find_pc_partial_function (addr, &fn, NULL, NULL)
+ && startswith (fn, "KERNEL32!IsBad")))
+ return true;
+#endif
+ return false;
}
/* Resume thread specified by ID, or all artificially suspended
desired_stop_thread_id = id;
- /* If there are pending stops, and we might plausibly hit one of
- them, we don't want to actually continue the inferior -- we just
- want to report the stop. In this case, we just pretend to
- continue. See the comment by the definition of "pending_stops"
- for details on why this is needed. */
- for (const auto &item : pending_stops)
- {
- if (desired_stop_thread_id == -1
- || desired_stop_thread_id == item.thread_id)
- {
- DEBUG_EVENTS (("windows_continue - pending stop anticipated, "
- "desired=0x%x, item=0x%x\n",
- desired_stop_thread_id, item.thread_id));
- return TRUE;
- }
- }
-
- DEBUG_EVENTS (("ContinueDebugEvent (cpid=%d, ctid=0x%x, %s);\n",
- (unsigned) last_wait_event.dwProcessId,
- (unsigned) last_wait_event.dwThreadId,
- continue_status == DBG_CONTINUE ?
- "DBG_CONTINUE" : "DBG_EXCEPTION_NOT_HANDLED"));
+ if (matching_pending_stop (debug_events))
+ return TRUE;
for (windows_thread_info *th : thread_list)
if (id == -1 || id == (int) th->tid)
th->suspend ();
}
- res = ContinueDebugEvent (last_wait_event.dwProcessId,
- last_wait_event.dwThreadId,
- continue_status);
+ res = continue_last_debug_event (continue_status, debug_events);
if (!res)
error (_("Failed to resume program execution"
return TRUE;
}
-/* A wrapper for WaitForDebugEvent that sets "last_wait_event"
- appropriately. */
-static BOOL
-wait_for_debug_event (DEBUG_EVENT *event, DWORD timeout)
-{
- BOOL result = WaitForDebugEvent (event, timeout);
- if (result)
- last_wait_event = *event;
- return result;
-}
-
/* Get the next event from the child. Returns a non-zero thread id if the event
requires handling by WFI (or whatever). */
/* If there is a relevant pending stop, report it now. See the
comment by the definition of "pending_stops" for details on why
this is needed. */
- for (auto iter = pending_stops.begin ();
- iter != pending_stops.end ();
- ++iter)
+ gdb::optional<pending_stop> stop = fetch_pending_stop (debug_events);
+ if (stop.has_value ())
{
- if (desired_stop_thread_id == -1
- || desired_stop_thread_id == iter->thread_id)
- {
- thread_id = iter->thread_id;
- *ourstatus = iter->status;
- current_event = iter->event;
-
- inferior_ptid = ptid_t (current_event.dwProcessId, thread_id, 0);
- current_windows_thread = thread_rec (inferior_ptid,
- INVALIDATE_CONTEXT);
- current_windows_thread->reload_context = 1;
+ thread_id = stop->thread_id;
+ *ourstatus = stop->status;
- DEBUG_EVENTS (("get_windows_debug_event - "
- "pending stop found in 0x%x (desired=0x%x)\n",
- thread_id, desired_stop_thread_id));
+ inferior_ptid = ptid_t (current_event.dwProcessId, thread_id, 0);
+ current_windows_thread = thread_rec (inferior_ptid,
+ INVALIDATE_CONTEXT);
+ current_windows_thread->reload_context = 1;
- pending_stops.erase (iter);
- return thread_id;
- }
+ return thread_id;
}
last_sig = GDB_SIGNAL_0;
"EXCEPTION_DEBUG_EVENT"));
if (saw_create != 1)
break;
- switch (handle_exception (ourstatus))
+ switch (handle_exception (ourstatus, debug_exceptions))
{
case HANDLE_EXCEPTION_UNHANDLED:
default:
thread_id, desired_stop_thread_id));
if (current_event.dwDebugEventCode == EXCEPTION_DEBUG_EVENT
- && (current_event.u.Exception.ExceptionRecord.ExceptionCode
- == EXCEPTION_BREAKPOINT)
+ && ((current_event.u.Exception.ExceptionRecord.ExceptionCode
+ == EXCEPTION_BREAKPOINT)
+ || (current_event.u.Exception.ExceptionRecord.ExceptionCode
+ == STATUS_WX86_BREAKPOINT))
&& windows_initialization_done)
{
ptid_t ptid = ptid_t (current_event.dwProcessId, thread_id, 0);
th = thread_rec (ptid, INVALIDATE_CONTEXT);
th->stopped_at_software_breakpoint = true;
+ th->pc_adjusted = false;
}
pending_stops.push_back ({thread_id, *ourstatus, current_event});
thread_id = 0;
{
current_windows_thread->stopped_at_software_breakpoint = false;
if (current_event.dwDebugEventCode == EXCEPTION_DEBUG_EVENT
- && (current_event.u.Exception.ExceptionRecord.ExceptionCode
- == EXCEPTION_BREAKPOINT)
+ && ((current_event.u.Exception.ExceptionRecord.ExceptionCode
+ == EXCEPTION_BREAKPOINT)
+ || (current_event.u.Exception.ExceptionRecord.ExceptionCode
+ == STATUS_WX86_BREAKPOINT))
&& windows_initialization_done)
- current_windows_thread->stopped_at_software_breakpoint = true;
+ {
+ current_windows_thread->stopped_at_software_breakpoint
+ = true;
+ current_windows_thread->pc_adjusted = false;
+ }
}
return result;
projects / deliverable / binutils-gdb.git / blobdiff