mirror of
https://github.com/tobast/libunwind-eh_elf.git
synced 2024-11-27 01:27:39 +01:00
757746aefb
label. gcc-3.x otherwise notices that the label isn't used for control-flow and feels free to move it around (usually to the beginning of the basic-block), with very bad consequences. (Logical change 1.70)
155 lines
3.6 KiB
C
155 lines
3.6 KiB
C
/* libunwind - a platform-independent unwind library
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Copyright (C) 2001-2003 Hewlett-Packard Co
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Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/* This illustrates the basics of using the unwind interface for
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exception handling. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <libunwind.h>
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#define panic(args...) \
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{ ++nerrors; fprintf (stderr, args); }
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int nerrors = 0;
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int verbose = 0;
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static void b (void *);
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static void
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raise_exception (void *addr)
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{
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unw_cursor_t cursor;
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unw_word_t ip;
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unw_context_t uc;
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unw_getcontext (&uc);
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if (unw_init_local (&cursor, &uc) < 0)
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{
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panic ("unw_init_local() failed!\n");
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return;
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}
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/* unwind to frame b(): */
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if (unw_step (&cursor) < 0)
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{
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panic ("unw_step() failed!\n");
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return;
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}
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/* unwind to frame a(): */
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if (unw_step (&cursor) < 0)
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{
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panic ("unw_step() failed!\n");
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return;
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}
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unw_get_reg (&cursor, UNW_REG_IP, &ip);
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if (verbose)
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printf ("old ip = %lx, new ip = %p\n", (long) ip, addr);
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if (unw_set_reg (&cursor, UNW_REG_IP, (unw_word_t) addr) < 0)
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{
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panic ("unw_set_reg() failed!\n");
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return;
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}
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unw_resume (&cursor); /* transfer control to exception handler */
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}
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#if !UNW_TARGET_IA64
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void *
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__builtin_ia64_bsp (void)
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{
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return NULL;
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}
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#endif
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static int
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a (void)
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{
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long stack;
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#ifdef __GNUC__
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void *label;
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if (verbose)
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printf ("a: sp=%p bsp=%p\n", &stack, __builtin_ia64_bsp ());
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#ifdef UNW_TARGET_IA64
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asm ("movl %0=Label" : "=r"(label));
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#else
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label = &&handler;
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#endif
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b (label);
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panic ("FAILURE: unexpected return from func()!\n");
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#if UNW_TARGET_IA64
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asm volatile ("Label:"); /* force a new bundle */
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#else
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handler:
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#endif
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if (verbose)
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{
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printf ("exception handler: here we go (sp=%p, bsp=%p)...\n",
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&stack, __builtin_ia64_bsp ());
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/* This call works around a bug in gcc (up-to pre3.4) which
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causes invalid assembly code to be generated when
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__builtin_ia64_bsp() gets predicated. */
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getpid ();
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}
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#else
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if (verbose)
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printf ("a: this test only works with GNU C compiler.\n");
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#endif
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return 0;
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}
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static void
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b (void *addr)
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{
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if (verbose)
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printf ("b() calling raise_exception()\n");
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raise_exception (addr);
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panic ("FAILURE: b() returned from raise_exception()!!\n");
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}
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int
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main (int argc, char **argv)
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{
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if (argc > 1)
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++verbose;
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if (a () != 0 || nerrors > 0)
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{
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fprintf (stderr, "FAILURE: test failed; try again?\n");
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exit (-1);
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}
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if (verbose)
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printf ("SUCCESS!\n");
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return 0;
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}
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