Mail Archives: cygwin-developers/1999/06/09/17:46:46
I'm not sure why you'd want to use gdb in this fashion since it can't
currently use symbol information from VC++ programs.
Also, I *really* don't want to have discussions in cygwin-developers
that are cross-pollinated from cygwin so I've removed
cygwin AT sourceware DOT cygnus DOT com from the To:.
cgf
On Wed, Jun 09, 1999 at 08:07:20PM +0000, John R Hanson wrote:
>Following is a patch to add basic support to the cvs gdb
>for JIT debugging on win95 and NT 4.
>
>Currently only works for vc++ and mingw32 .exe's cause
>cygwin doesn't let the system handle exceptions.
>(easy fix is just to return 1 in .../winsup/exceptions.cc->handel_exceptions()
> instead of printing out those oh so useful *.core files :)
>
>TODO (for someone else ;) get executable name from pid and load it.
>WORKAROUND use
>add-symbol-file filename.exe 0x401000
>at the (gdb) prompt.
>
>Could someone please check if this works for
>98 and 2000?
>
>REGEDIT4
>
>[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\aedebug]
>"Auto"="0"
>"Debugger"="d:/usr/H-i586~1/bin/gdb -c %#x -Event-HANDLE %ld"
>
>
>
>--- ./win32-nat.c 1999/05/30 10:17:24 1.2
>+++ ./win32-nat.c 1999/06/04 11:22:14
>@@ -119,6 +119,8 @@
> static int debug_memory = 0; /* show target memory accesses */
> static int debug_exceptions = 0; /* show target exceptions */
>
>+HANDLE notify_attach = 0; /* JIT event handle from command line to notify kernel we are attached */
>+
> /* This vector maps GDB's idea of a register's number into an address
> in the win32 exception context vector.
>
>@@ -639,6 +641,8 @@
> case EXCEPTION_BREAKPOINT:
> DEBUG_EXCEPT (("gdb: Target exception BREAKPOINT at 0x%08x\n",
> current_event.u.Exception.ExceptionRecord.ExceptionAddress));
>+ if (current_event.u.Exception.dwFirstChance && notify_attach){ th->context.Eip = (DWORD)current_event.u.Exception.ExceptionRecord.ExceptionAddress + 1; SetThreadContext(th->h, &th->context); }
>+ if (notify_attach && (exception_count == 1) && !(GetVersion() < 0x80000000) && !SetEvent(notify_attach)) DEBUG_EXCEPT (("gdb: could not notify windows of attach\n"));
> ourstatus->value.sig = TARGET_SIGNAL_TRAP;
> break;
> case DBG_CONTROL_C:
>@@ -712,6 +716,7 @@
> char *p;
> thread_info *th;
> int sig;
>+ int except_result;
>
> if (debug_event)
> {
>@@ -738,6 +743,8 @@
> current_event.dwProcessId, current_event.dwThreadId,
> "EXIT_THREAD_DEBUG_EVENT"));
> child_delete_thread (current_event.dwThreadId);
>+ if (notify_attach && (GetVersion() < 0x80000000) && SetEvent(notify_attach)) notify_attach = 0;
>+ else if (notify_attach && (GetVersion() < 0x80000000)) {DEBUG_EVENTS (("gdb: could not notify NT of attach event. HANDLE=%\n", notify_attach)); notify_attach = 0;}
> break;
>
> case CREATE_PROCESS_DEBUG_EVENT:
>@@ -780,8 +787,11 @@
> DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
> current_event.dwProcessId, current_event.dwThreadId,
> "EXCEPTION_DEBUG_EVENT"));
>- if (handle_exception (ourstatus))
>- return current_event.dwThreadId;
>+ if ((except_result = handle_exception (ourstatus)) && ((ourstatus->value.sig != TARGET_SIGNAL_TRAP) || !notify_attach))
>+ return current_event.dwThreadId; /* not a trap or we are not JIT attaching */
>+#define DBG_EXCEPTION_HANDLED ((DWORD)0x00010001L)
>+ else if (except_result && (GetVersion() < 0x80000000)) { continue_status = DBG_EXCEPTION_HANDLED; break; /* attaching NT */ }
>+ else if (except_result && (exception_count == 2)){notify_attach = 0;break; /* 9x fall through for the 1st one */}
> continue_status = DBG_EXCEPTION_NOT_HANDLED;
> break;
>
>--- ./config/i386/xm-cygwin.h 1999/05/31 14:41:24 1.1
>+++ ./config/i386/xm-cygwin.h 1999/06/04 11:09:58
>@@ -33,3 +33,7 @@
>
> #define HAVE_SIGSETMASK 0
>
>+extern void *notify_attach; /* kernel supplied event handle to notify it of JIT attach */
>+#define ADDITIONAL_OPTIONS {"Event-HANDLE", required_argument, 0, 1004},
>+#define ADDITIONAL_OPTION_CASES case 1004: notify_attach = (HANDLE)atoi(optarg); break;
>+#define ADDITIONAL_OPTION_HELP " -Event-HANDLE HANDLE handle to signal the kernel we have attached for JIT.\n"
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