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65 lines
1.9 KiB
C
65 lines
1.9 KiB
C
/* libunwind - a platform-independent unwind library
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Copyright (C) 2012 Tommi Rantala <tt.rantala@gmail.com>
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Copyright (C) 2013 Linaro Limited
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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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/* The restorer stub will always have the form:
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d2801168 movz x8, #0x8b
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d4000001 svc #0x0
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*/
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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, 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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ip = c->dwarf.ip;
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ret = (*a->access_mem) (as, ip, &w0, 0, arg);
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if (ret < 0)
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return ret;
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/* FIXME: distinguish 32bit insn vs 64bit registers. */
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if (w0 != 0xd4000001d2801168)
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return 0;
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return 1;
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#else
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return -UNW_ENOINFO;
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#endif
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}
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