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https://github.com/tobast/libunwind-eh_elf.git
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143 lines
3.5 KiB
C
143 lines
3.5 KiB
C
/* libunwind - a platform-independent unwind library
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Copyright (C) 2004 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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/* Test to verify that we can siglongjmp() into a frame whose register
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window is not backed by valid memory. */
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <errno.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#ifdef HAVE_IA64INTRIN_H
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# include <ia64intrin.h>
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#endif
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static sigjmp_buf env;
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static int return_level;
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static uintptr_t return_bsp;
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static int verbose;
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uintptr_t
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get_bsp (void)
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{
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#ifdef __INTEL_COMPILER
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return __getReg (_IA64_REG_AR_BSP);
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#else
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return (uintptr_t) __builtin_ia64_bsp ();
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#endif
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}
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static void
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sighandler (int signal, void *siginfo, void *sigcontext)
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{
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ucontext_t *uc = sigcontext;
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int local = 0;
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if (verbose)
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printf ("got signal, stack at %p, saved bsp=0x%lx\n",
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&local, uc->uc_mcontext.sc_ar_bsp);
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siglongjmp (env, 1);
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}
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static void
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doit (int n)
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{
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uintptr_t guard_page_addr, bsp = get_bsp ();
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if (n == 0)
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{
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size_t page_size = getpagesize ();
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guard_page_addr = (bsp + page_size - 1) & -page_size;
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if (verbose)
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printf ("guard_page_addr = 0x%lx\n", (unsigned long) guard_page_addr);
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if (mmap ((void *) guard_page_addr, page_size, PROT_NONE,
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MAP_SHARED | MAP_ANONYMOUS, -1, 0) != (void *) guard_page_addr)
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{
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perror ("mmap");
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exit (EXIT_FAILURE);
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}
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}
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if (sigsetjmp (env, 1))
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{
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return_level = n;
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return_bsp = bsp;
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}
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else
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doit (n + 1);
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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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struct sigaction sa;
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stack_t ss;
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if (argc > 1)
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verbose = 1;
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ss.ss_sp = malloc (2 * SIGSTKSZ);
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if (ss.ss_sp == NULL)
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{
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puts ("failed to allocate alternate stack");
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return EXIT_FAILURE;
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}
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ss.ss_flags = 0;
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ss.ss_size = 2 * SIGSTKSZ;
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if (sigaltstack (&ss, NULL) < 0)
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{
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printf ("sigaltstack failed: %s\n", strerror (errno));
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return EXIT_FAILURE;
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}
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sa.sa_handler = (void (*) (int)) sighandler;
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sigemptyset (&sa.sa_mask);
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sa.sa_flags = SA_SIGINFO | SA_ONSTACK;
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if (sigaction (SIGSEGV, &sa, NULL) < 0)
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{
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printf ("sigaction failed: %s\n", strerror (errno));
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exit (1);
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}
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doit (0);
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if (verbose)
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{
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printf ("sigsetjmp returned at level %d bsp=0x%lx\n",
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return_level, return_bsp);
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puts ("Test succeeded!");
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}
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return EXIT_SUCCESS;
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}
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