mirror of
https://github.com/tobast/libunwind-eh_elf.git
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8d5b1aeeff
Add support for the 32bit SuperH architecture running Linux. Specifically, support is added for SH4, and support for earlier SH versions and to the 64bit SH5 are left out. This was tested in qemu with a little-endian SH4 debian image & GCC 4.7 cross compiler.
119 lines
3.3 KiB
C
119 lines
3.3 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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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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