winsup/cygwin/local_includes/exception.h

   1 /* exception.h
   2
   3 This software is a copyrighted work licensed under the terms of the
   4 Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
   5 details. */
   6
   7 #pragma once
   8
   9 #define exception_list void
  10 typedef struct _DISPATCHER_CONTEXT *PDISPATCHER_CONTEXT;
  11
  12 class exception
  13 {
  14   static EXCEPTION_DISPOSITION myfault (EXCEPTION_RECORD *, exception_list *,
  15                                         CONTEXT *, PDISPATCHER_CONTEXT);
  16   static EXCEPTION_DISPOSITION handle (EXCEPTION_RECORD *, exception_list *,
  17                                        CONTEXT *, PDISPATCHER_CONTEXT);
  18 public:
  19   exception () __attribute__ ((always_inline))
  20   {
  21     /* Install SEH handler. */
  22     asm volatile ("\n\
  23     1:                                                                  \n\
  24       .seh_handler                                                        \
  25         _ZN9exception6handleEP17_EXCEPTION_RECORDPvP8_CONTEXTP19_DISPATCHER_CONTEXT,      \
  26         @except                                                         \n\
  27       .seh_handlerdata                                                  \n\
  28       .long 1                                                           \n\
  29       .rva 1b, 2f, 2f, 2f                                               \n\
  30       .seh_code                                                         \n");
  31   };
  32   ~exception () __attribute__ ((always_inline))
  33   {
  34     asm volatile ("\n\
  35       nop                                                               \n\
  36     2:                                                                  \n\
  37       nop                                                               \n");
  38   }
  39 };
  40
  41 LONG CALLBACK myfault_altstack_handler (EXCEPTION_POINTERS *);
  42
  43 class cygwin_exception
  44 {
  45   PUINT_PTR framep;
  46   PCONTEXT ctx;
  47   EXCEPTION_RECORD *e;
  48   HANDLE h;
  49   void dump_exception ();
  50   void open_stackdumpfile ();
  51 public:
  52   cygwin_exception (PUINT_PTR in_framep, PCONTEXT in_ctx = NULL, EXCEPTION_RECORD *in_e = NULL):
  53     framep (in_framep), ctx (in_ctx), e (in_e), h (NULL) {}
  54   void dumpstack ();
  55   PCONTEXT context () const {return ctx;}
  56   EXCEPTION_RECORD *exception_record () const {return e;}
  57 };