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120 lines
3.3 KiB
C
120 lines
3.3 KiB
C
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/* libunwind - a platform-independent unwind library
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Copyright (C) 2012 Tommi Rantala <tt.rantala@gmail.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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/* Disassembly of the Linux VDSO sigreturn functions:
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00000000 <__kernel_sigreturn>:
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0: 05 93 mov.w e <__kernel_sigreturn+0xe>,r3 ! 77
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2: 10 c3 trapa #16
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4: 0b 20 or r0,r0
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6: 0b 20 or r0,r0
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8: 0b 20 or r0,r0
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a: 0b 20 or r0,r0
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c: 0b 20 or r0,r0
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e: 77 00 .word 0x0077
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10: 09 00 nop
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12: 09 00 nop
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14: 09 00 nop
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16: 09 00 nop
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18: 09 00 nop
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1a: 09 00 nop
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1c: 09 00 nop
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1e: 09 00 nop
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00000020 <__kernel_rt_sigreturn>:
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20: 05 93 mov.w 2e <__kernel_rt_sigreturn+0xe>,r3 ! ad
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22: 10 c3 trapa #16
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24: 0b 20 or r0,r0
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26: 0b 20 or r0,r0
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28: 0b 20 or r0,r0
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2a: 0b 20 or r0,r0
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2c: 0b 20 or r0,r0
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2e: ad 00 mov.w @(r0,r10),r0
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30: 09 00 nop
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32: 09 00 nop
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34: 09 00 nop
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36: 09 00 nop
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38: 09 00 nop
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3a: 09 00 nop
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3c: 09 00 nop
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3e: 09 00 nop
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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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if (w0 != 0xc3109305)
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return 0;
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ret = (*a->access_mem) (as, ip+4, &w0, 0, arg);
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if (ret < 0)
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return ret;
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if (w0 != 0x200b200b)
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return 0;
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ret = (*a->access_mem) (as, ip+8, &w0, 0, arg);
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if (ret < 0)
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return ret;
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if (w0 != 0x200b200b)
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return 0;
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ret = (*a->access_mem) (as, ip+12, &w0, 0, arg);
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if (ret < 0)
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return ret;
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if (w0 == 0x0077200b)
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return 1; /* non-RT */
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else if (w0 == 0x00ad200b)
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return 2; /* RT */
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/* does not look like a signal frame */
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return 0;
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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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