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https://github.com/tobast/libunwind-eh_elf.git
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137 lines
3.2 KiB
C
137 lines
3.2 KiB
C
/* libunwind - a platform-independent unwind library
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Copyright (C) 2001-2002 Hewlett-Packard Co
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Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
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This file is part of libunwind.
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libunwind is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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libunwind is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unwind.h>
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#define panic(args...) \
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{ fprintf (stderr, args); exit (-1); }
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static void
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init_state (unw_context_t *ucp)
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{
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int i;
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ucp->uc_mcontext.sc_flags = 0;
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ucp->uc_mcontext.sc_ar_ccv = random ();
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ucp->uc_mcontext.sc_ar_lc = random ();
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ucp->uc_mcontext.sc_pr = random ();
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#if 0
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ucp->uc_mcontext.sc_ip = xxx;
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ucp->uc_mcontext.sc_cfm = xxx;
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ucp->uc_mcontext.sc_um = xxx;
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ucp->uc_mcontext.sc_ar_rsc = xxx;
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ucp->uc_mcontext.sc_ar_bsp = xxx;
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ucp->uc_mcontext.sc_ar_rnat = xxx;
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ucp->uc_mcontext.sc_ar_unat = xxx;
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ucp->uc_mcontext.sc_ar_fpsr = xxx;
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ucp->uc_mcontext.sc_ar_pfs = xxx;
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#endif
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/* initialize static registers without trashing gp (r1), sp (r12),
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or tp (r13). */
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for (i = 2; i < 32; ++i)
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{
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if (i != 12 && i != 13)
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{
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ucp->uc_mcontext.sc_gr[i] = random ();
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ucp->uc_mcontext.sc_nat |= (random () & 1) << i;
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}
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}
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#if 0
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/* initialize stacked registers: */
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for (i = 32; i < 128; ++i)
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{
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xxx;
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}
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#endif
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for (i = 0; i < 8; ++i)
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ucp->uc_mcontext.sc_br[i] = random ();
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for (i = 0; i < 128; ++i)
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{
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ucp->uc_mcontext.sc_fr[i].u.bits[0] = random ();
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ucp->uc_mcontext.sc_fr[i].u.bits[0] = random ();
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}
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#if 0
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ucp->uc_mcontext.sc_rbs_base = xxx;
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ucp->uc_mcontext.sc_loadrs = xxx;
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ucp->uc_mcontext.sc_ar25 = xxx;
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ucp->uc_mcontext.sc_ar26 = xxx;
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#endif
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}
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static void
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check_state (ucontext_t *orig_state, unw_cursor_t *c)
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{
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unw_word_t val;
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unw_get_reg (c, UNW_REG_IP, &val);
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printf ("IP: orig=%016lx now=%016lx\n", orig_state->uc_mcontext.sc_ip, val);
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}
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static void
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setup_context (ucontext_t *unwind_ucp)
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{
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asm volatile ("mov ar.fpsr = %0" :: "r"(0x9804c8a70033f));
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init_state (unwind_ucp);
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setcontext (unwind_ucp);
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}
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static void
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check (ucontext_t *unwind_ucp, ucontext_t *setup_ucp,
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void (*doit) (ucontext_t *))
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{
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swapcontext (unwind_ucp, setup_ucp);
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(*doit) (unwind_ucp);
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}
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static void
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test1 (ucontext_t *orig_state)
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{
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unw_cursor_t cursor;
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ucontext_t uc;
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getcontext (&uc);
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if (unw_init_local (&cursor, &uc) < 0)
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panic ("unw_init_local failed\n");
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if (unw_step (&cursor) < 0)
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panic ("unw_step failed\n");
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check_state (orig_state, &cursor);
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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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ucontext_t unwind_uc, setup_uc;
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unsigned char stack_mem[256*1024];
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setup_uc.uc_stack.ss_sp = stack_mem;
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setup_uc.uc_stack.ss_flags = 0;
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setup_uc.uc_stack.ss_size = sizeof (stack_mem);
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makecontext (&setup_uc, (void (*) (void)) setup_context,
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2, &setup_uc, &unwind_uc);
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check (&unwind_uc, &setup_uc, test1);
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return 0;
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}
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