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71 lines
2.3 KiB
C
71 lines
2.3 KiB
C
/* libunwind - a platform-independent unwind library
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Copyright (C) 2002-2003 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, 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 EIP points at sigreturn() sequence. On Linux, this is:
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__restore:
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0x58 pop %eax
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0xb8 0x77 0x00 0x00 0x00 movl 0x77,%eax
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0xcd 0x80 int 0x80
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without SA_SIGINFO, and
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__restore_rt:
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0xb8 0xad 0x00 0x00 0x00 movl 0x80,%eax
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0xcd 0x80 int 0x80
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0x90 nop
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if SA_SIGINFO is specified.
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*/
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ip = c->dwarf.ip;
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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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return ret;
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ret = ((w0 == 0x0077b858 && w1 == 0x80cd0000)
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|| (w0 == 0x0000adb8 && w1 == 0x9080cd00));
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Debug (16, "returning %d\n", 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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