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- /* libunwind - a platform-independent unwind library
- Copyright (C) 2004 Hewlett-Packard Co
- Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
- This file is part of libunwind.
- Permission is hereby granted, free of charge, to any person obtaining
- a copy of this software and associated documentation files (the
- "Software"), to deal in the Software without restriction, including
- without limitation the rights to use, copy, modify, merge, publish,
- distribute, sublicense, and/or sell copies of the Software, and to
- permit persons to whom the Software is furnished to do so, subject to
- the following conditions:
- The above copyright notice and this permission notice shall be
- included in all copies or substantial portions of the Software.
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
- LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
- OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
- WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
- #include "unwind_i.h"
- PROTECTED int
- unw_is_signal_frame (unw_cursor_t *cursor)
- {
- #ifdef __linux__
- struct cursor *c = (struct cursor *) cursor;
- unw_word_t w0, w1, w2, w3, ip;
- unw_addr_space_t as;
- unw_accessors_t *a;
- void *arg;
- int ret;
- as = c->dwarf.as;
- a = unw_get_accessors (as);
- arg = c->dwarf.as_arg;
- /* Check if IP points at sigreturn() sequence. On Linux, this normally is:
- rt_sigreturn:
- 0x34190000 ldi 0, %r25
- 0x3414015a ldi __NR_rt_sigreturn,%r20
- 0xe4008200 be,l 0x100(%sr2,%r0),%sr0,%r31
- 0x08000240 nop
- When a signal interrupts a system call, the first word is instead:
- 0x34190002 ldi 1, %r25
- */
- ip = c->dwarf.ip;
- if (!ip)
- return 0;
- if ((ret = (*a->access_mem) (as, ip, &w0, 0, arg)) < 0
- || (ret = (*a->access_mem) (as, ip + 4, &w1, 0, arg)) < 0
- || (ret = (*a->access_mem) (as, ip + 8, &w2, 0, arg)) < 0
- || (ret = (*a->access_mem) (as, ip + 12, &w3, 0, arg)) < 0)
- {
- Debug (1, "failed to read sigreturn code (ret=%d)\n", ret);
- return ret;
- }
- ret = ((w0 == 0x34190000 || w0 == 0x34190002)
- && w1 == 0x3414015a && w2 == 0xe4008200 && w3 == 0x08000240);
- Debug (1, "(cursor=%p, ip=0x%08lx) -> %d\n", c, (unsigned) ip, ret);
- return ret;
- #else
- printf ("%s: implement me\n", __FUNCTION__);
- #endif
- return -UNW_ENOINFO;
- }
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