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      1 /* libunwind - a platform-independent unwind library
      2    Copyright (C) 2001-2004 Hewlett-Packard Co
      3 	Contributed by David Mosberger-Tang <davidm (at) hpl.hp.com>
      4 
      5 Permission is hereby granted, free of charge, to any person obtaining
      6 a copy of this software and associated documentation files (the
      7 "Software"), to deal in the Software without restriction, including
      8 without limitation the rights to use, copy, modify, merge, publish,
      9 distribute, sublicense, and/or sell copies of the Software, and to
     10 permit persons to whom the Software is furnished to do so, subject to
     11 the following conditions:
     12 
     13 The above copyright notice and this permission notice shall be
     14 included in all copies or substantial portions of the Software.
     15 
     16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     17 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     18 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     19 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
     20 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
     21 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
     22 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
     23 
     24 /* This illustrates the basics of using the unwind interface for
     25    exception handling.  */
     26 
     27 #ifdef HAVE_CONFIG_H
     28 # include "config.h"
     29 #endif
     30 
     31 #include <stdio.h>
     32 #include <stdlib.h>
     33 #include <unistd.h>
     34 
     35 #include <libunwind.h>
     36 
     37 #ifdef HAVE_IA64INTRIN_H
     38 # include <ia64intrin.h>
     39 #endif
     40 
     41 #define panic(args...)				\
     42 	{ ++nerrors; fprintf (stderr, args); }
     43 
     44 int nerrors = 0;
     45 int verbose = 0;
     46 int depth = 13;
     47 volatile int got_here = 0;
     48 
     49 extern void b (int);
     50 
     51 void
     52 raise_exception (void)
     53 {
     54   unw_cursor_t cursor;
     55   unw_context_t uc;
     56   int i;
     57 
     58   unw_getcontext (&uc);
     59   if (unw_init_local (&cursor, &uc) < 0)
     60     {
     61       panic ("unw_init_local() failed!\n");
     62       return;
     63     }
     64 
     65   /* unwind to top-most frame a(), skipping over b() and raise_exception(): */
     66   for (i = 0; i < depth + 2; ++i)
     67     if (unw_step (&cursor) < 0)
     68       {
     69 	panic ("unw_step() failed!\n");
     70 	return;
     71       }
     72   unw_resume (&cursor);	/* transfer control to exception handler */
     73 }
     74 
     75 uintptr_t
     76 get_bsp (void)
     77 {
     78 #if UNW_TARGET_IA64
     79 # ifdef __INTEL_COMPILER
     80   return __getReg (_IA64_REG_AR_BSP);
     81 # else
     82   return (uintptr_t) __builtin_ia64_bsp ();
     83 # endif
     84 #else
     85   return 0;
     86 #endif
     87 }
     88 
     89 int
     90 a (int n)
     91 {
     92   long stack;
     93   int result = 99;
     94 
     95   if (verbose)
     96     printf ("a(n=%d): sp=%p bsp=0x%lx\n",
     97 	    n, &stack, (unsigned long) get_bsp ());
     98 
     99   if (n > 0)
    100     a (n - 1);
    101   else
    102     b (16);
    103 
    104   if (verbose)
    105     {
    106       printf ("exception handler: here we go (sp=%p, bsp=0x%lx)...\n",
    107 	      &stack, (unsigned long) get_bsp ());
    108       /* This call works around a bug in gcc (up-to pre3.4) which
    109 	 causes invalid assembly code to be generated when
    110 	 __builtin_ia64_bsp() gets predicated.  */
    111       getpid ();
    112     }
    113   if (n == depth)
    114     {
    115       result = 0;
    116       got_here = 1;
    117     }
    118   return result;
    119 }
    120 
    121 void
    122 b (int n)
    123 {
    124   if ((n & 1) == 0)
    125     {
    126       if (verbose)
    127 	printf ("b(n=%d) calling raise_exception()\n", n);
    128       raise_exception ();
    129     }
    130   panic ("FAILURE: b() returned from raise_exception()!!\n");
    131 }
    132 
    133 int
    134 main (int argc, char **argv)
    135 {
    136   int result;
    137 
    138   if (argc > 1)
    139     {
    140       ++verbose;
    141       depth = atol (argv[1]);
    142       if (depth < 1)
    143 	{
    144 	  fprintf (stderr, "Usage: %s depth\n"
    145 		   "  depth must be >= 1\n", argv[0]);
    146 	  exit (-1);
    147 	}
    148     }
    149 
    150   result = a (depth);
    151   if (result != 0 || !got_here || nerrors > 0)
    152     {
    153       fprintf (stderr,
    154 	       "FAILURE: test failed: result=%d got_here=%d nerrors=%d\n",
    155 	       result, got_here, nerrors);
    156       exit (-1);
    157     }
    158 
    159   if (verbose)
    160     printf ("SUCCESS!\n");
    161   return 0;
    162 }
    163