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libunwind-eh_elf/tests/exc.c
mostang.com!davidm 5a9743cd77 (b): Add a printf() after raise_exception() to avoid triggering the sibcall
optimization for this call.

(Logical change 1.19)
2002-07-18 03:58:34 +00:00

92 lines
2.1 KiB
C

/* libunwind - a platform-independent unwind library
Copyright (C) 2001-2002 Hewlett-Packard Co
Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
This file is part of libunwind.
libunwind is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
libunwind is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details. */
/* This illustrates the basics of using the unwind interface for
exception handling. */
#include <stdio.h>
#include <stdlib.h>
#define UNW_LOCAL_ONLY
#include <libunwind.h>
#define panic(args...) \
{ fprintf (stderr, args); exit (-1); }
int true = 1;
static void
raise_exception (void *addr)
{
unw_cursor_t cursor;
unw_word_t ip;
unw_context_t uc;
unw_getcontext (&uc);
if (unw_init_local (&cursor, &uc) < 0)
panic ("unw_init_local() failed!\n");
/* unwind to frame b(): */
if (unw_step (&cursor) < 0)
panic ("unw_step() failed!\n");
/* unwind to frame a(): */
if (unw_step (&cursor) < 0)
panic ("unw_step() failed!\n");
unw_get_reg (&cursor, UNW_REG_IP, &ip);
printf ("ip = %lx\n", ip);
if (unw_set_reg (&cursor, UNW_REG_IP, (unw_word_t) addr) < 0)
panic ("unw_set_reg() failed!\n");
unw_resume (&cursor); /* transfer control to exception handler */
}
static void
b (void *addr)
{
printf ("b() calling raise_exception()\n");
raise_exception (addr);
printf ("b(): back from raise_exception!!\n");
}
static int
a (void)
{
register long sp asm ("r12");
printf("a: sp=%lx bsp=%p\n", sp, __builtin_ia64_bsp ());
b (&&handler);
printf ("unexpected return from func()!\n");
if (true)
return -1;
handler:
printf ("exception handler: here we go (sp=%lx, bsp=%p)...\n",
sp, __builtin_ia64_bsp ());
return 0;
}
int
main (int argc, char **argv)
{
if (a () == 0)
printf ("test succeeded!\n");
else
printf ("bummer: test failed; try again?\n");
return 0;
}