Mailing-List: contact cygwin-help AT sourceware DOT cygnus DOT com; run by ezmlm Sender: cygwin-owner AT sourceware DOT cygnus DOT com Delivered-To: mailing list cygwin AT sourceware DOT cygnus DOT com From: JRSON AT NetZero DOT Net (John R Hanson) To: cygwin AT sourceware DOT cygnus DOT com Cc: cygwin-developers AT sourceware DOT cygnus DOT com Subject: JIT debugging with gdb Date: Wed, 09 Jun 1999 20:07:20 GMT Reply-To: JRSON AT NetZero DOT Net Message-ID: <375ec652.10516371@smtp.netzero.net> X-Mailer: Forte Agent 1.5/32.452 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Note-from-DJ: This may be spam 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" ________________________________________________________ NetZero - We believe in a FREE Internet. Shouldn't you? Get your FREE Internet Access and Email at http://www.netzero.net/download/index.html -- Want to unsubscribe from this list? Send a message to cygwin-unsubscribe AT sourceware DOT cygnus DOT com