1/* libunwind - a platform-independent unwind library 2 Copyright (C) 2001-2004 Hewlett-Packard Co 3 Contributed by David Mosberger-Tang <davidm@hpl.hp.com> 4 5Permission is hereby granted, free of charge, to any person obtaining 6a copy of this software and associated documentation files (the 7"Software"), to deal in the Software without restriction, including 8without limitation the rights to use, copy, modify, merge, publish, 9distribute, sublicense, and/or sell copies of the Software, and to 10permit persons to whom the Software is furnished to do so, subject to 11the following conditions: 12 13The above copyright notice and this permission notice shall be 14included in all copies or substantial portions of the Software. 15 16THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 17EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 18MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 19NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 20LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 21OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 22WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ 23 24/* This test uses the unwind interface to modify the IP in an ancestor 25 frame while still returning to the parent frame. */ 26 27#include <signal.h> 28#include <stdio.h> 29#include <stdlib.h> 30 31#include <libunwind-ia64.h> 32 33#define panic(args...) \ 34 { fprintf (stderr, args); exit (-1); } 35 36int verbose; 37 38static void 39sighandler (int signal) 40{ 41 unw_cursor_t cursor, cursor2; 42 unw_word_t ip; 43 unw_context_t uc; 44 45 if (verbose) 46 printf ("caught signal %d\n", signal); 47 48 unw_getcontext (&uc); 49 if (unw_init_local (&cursor, &uc) < 0) 50 panic ("unw_init() failed!\n"); 51 52 /* get cursor for caller of sighandler: */ 53 if (unw_step (&cursor) < 0) 54 panic ("unw_step() failed!\n"); 55 56 cursor2 = cursor; 57 while (!unw_is_signal_frame (&cursor2)) 58 if (unw_step (&cursor2) < 0) 59 panic ("failed to find signal frame!\n"); 60 61 if (unw_step (&cursor2) < 0) 62 panic ("unw_step() failed!\n"); 63 64 if (unw_get_reg (&cursor2, UNW_REG_IP, &ip) < 0) 65 panic ("failed to get IP!\n"); 66 67 /* skip faulting instruction (doesn't handle MLX template) */ 68 ++ip; 69 if ((ip & 0x3) == 0x3) 70 ip += 13; 71 72 if (unw_set_reg (&cursor2, UNW_REG_IP, ip) < 0) 73 panic ("failed to set IP!\n"); 74 75 unw_resume (&cursor); /* update context & return to caller of sighandler() */ 76 77 panic ("unexpected return from unw_resume()!\n"); 78} 79 80static void 81doit (volatile char *p) 82{ 83 int ch; 84 85 ch = *p; /* trigger SIGSEGV */ 86 87 if (verbose) 88 printf ("doit: finishing execution!\n"); 89} 90 91int 92main (int argc, char **argv) 93{ 94 if (argc > 1) 95 verbose = 1; 96 97 signal (SIGSEGV, sighandler); 98 doit (0); 99 if (verbose) 100 printf ("SUCCESS\n"); 101 return 0; 102} 103