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74 lines
2.5 KiB
C
74 lines
2.5 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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This file is part of libunwind.
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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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#include "unwind_i.h"
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PROTECTED int
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unw_is_signal_frame (unw_cursor_t *cursor)
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{
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#ifdef __linux__
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struct cursor *c = (struct cursor *) cursor;
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unw_word_t w0, w1, w2, w3, ip;
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unw_addr_space_t as;
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unw_accessors_t *a;
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void *arg;
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int ret;
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as = c->dwarf.as;
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a = unw_get_accessors (as);
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arg = c->dwarf.as_arg;
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/* Check if IP points at sigreturn() sequence. On Linux, this normally is:
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rt_sigreturn:
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0x34190000 ldi 0, %r25
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0x3414015a ldi __NR_rt_sigreturn,%r20
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0xe4008200 be,l 0x100(%sr2,%r0),%sr0,%r31
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0x08000240 nop
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When a signal interrupts a system call, the first word is instead:
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0x34190002 ldi 1, %r25
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*/
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ip = c->dwarf.ip;
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if (!ip)
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return 0;
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if ((ret = (*a->access_mem) (as, ip, &w0, 0, arg)) < 0
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|| (ret = (*a->access_mem) (as, ip + 4, &w1, 0, arg)) < 0
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|| (ret = (*a->access_mem) (as, ip + 8, &w2, 0, arg)) < 0
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|| (ret = (*a->access_mem) (as, ip + 12, &w3, 0, arg)) < 0)
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{
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Debug (1, "failed to read sigreturn code (ret=%d)\n", ret);
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return ret;
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}
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ret = ((w0 == 0x34190000 || w0 == 0x34190002)
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&& w1 == 0x3414015a && w2 == 0xe4008200 && w3 == 0x08000240);
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Debug (1, "(cursor=%p, ip=0x%08lx) -> %d\n", c, (unsigned) ip, ret);
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return ret;
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#else
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printf ("%s: implement me\n", __FUNCTION__);
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#endif
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return -UNW_ENOINFO;
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}
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