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https://github.com/tobast/libunwind-eh_elf.git
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16bf4e5e49
Detect if current frame is a signal frame by checking for preceeding syscall instruction. For signal frames, update the cursor correctly from user context before calling dwarf_step.
79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
/* libunwind - a platform-independent unwind library
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Copyright (C) 2015 Imagination Technologies Limited
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Copyright (C) 2008 CodeSourcery
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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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#include <stdio.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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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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ip = c->dwarf.ip;
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/* syscall */
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if ((ret = (*a->access_mem) (as, ip + 4, &w1, 0, arg)) < 0)
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return 0;
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if ((w1 & 0xffffffff) != 0x0c)
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return 0;
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/* li v0, 0x1061 (rt) or li v0, 0x1017 */
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if ((ret = (*a->access_mem) (as, ip, &w0, 0, arg)) < 0)
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return 0;
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switch (c->dwarf.as->abi)
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{
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case UNW_MIPS_ABI_O32:
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switch (w0 & 0xffffffff)
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{
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case 0x24021061:
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return 1;
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case 0x24021017:
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return 2;
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default:
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return 0;
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}
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case UNW_MIPS_ABI_N64:
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switch (w0 & 0xffffffff)
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{
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case 0x2402145b:
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return 1;
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default:
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return 0;
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}
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default:
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return 0;
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}
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}
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