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30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
/* Return backtrace of current program state.
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Copyright (C) 2013-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, see <https://www.gnu.org/licenses/>. */
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#include <execinfo.h>
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#include <stddef.h>
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#include <sysdep.h>
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#include <sys/trap.h>
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#include <backtrace.h>
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#include <unwind-link.h>
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struct layout
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{
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unsigned long locals[8];
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unsigned long ins[6];
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unsigned long next;
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void *return_address;
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};
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struct trace_arg
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{
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void **array;
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struct unwind_link *unwind_link;
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_Unwind_Word cfa;
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int cnt;
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int size;
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};
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static _Unwind_Reason_Code
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backtrace_helper (struct _Unwind_Context *ctx, void *a)
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{
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struct trace_arg *arg = a;
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_Unwind_Ptr ip;
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/* We are first called with address in the __backtrace function.
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Skip it. */
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if (arg->cnt != -1)
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{
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ip = UNWIND_LINK_PTR (arg->unwind_link, _Unwind_GetIP) (ctx);
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arg->array[arg->cnt] = (void *) ip;
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/* Check whether we make any progress. */
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_Unwind_Word cfa
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= UNWIND_LINK_PTR (arg->unwind_link, _Unwind_GetCFA) (ctx);
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if (arg->cnt > 0 && arg->array[arg->cnt - 1] == arg->array[arg->cnt]
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&& cfa == arg->cfa)
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return _URC_END_OF_STACK;
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arg->cfa = cfa;
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}
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if (++arg->cnt == arg->size)
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return _URC_END_OF_STACK;
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return _URC_NO_REASON;
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}
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int
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__backtrace (void **array, int size)
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{
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int count;
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struct trace_arg arg =
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{
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.array = array,
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.unwind_link = __libc_unwind_link_get (),
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.size = size,
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.cnt = -1,
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};
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if (size <= 0)
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return 0;
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if (arg.unwind_link == NULL)
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{
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struct layout *current;
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unsigned long fp, i7;
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asm volatile ("mov %%fp, %0" : "=r"(fp));
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asm volatile ("mov %%i7, %0" : "=r"(i7));
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current = (struct layout *) (fp + BACKTRACE_STACK_BIAS);
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array[0] = (void *) i7;
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if (size == 1)
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return 1;
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backtrace_flush_register_windows();
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for (count = 1; count < size; count++)
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{
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array[count] = current->return_address;
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if (!current->next)
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break;
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current = (struct layout *) (current->next + BACKTRACE_STACK_BIAS);
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}
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}
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else
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{
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UNWIND_LINK_PTR (arg.unwind_link, _Unwind_Backtrace)
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(backtrace_helper, &arg);
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/* _Unwind_Backtrace seems to put NULL address above
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_start. Fix it up here. */
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if (arg.cnt > 1 && arg.array[arg.cnt - 1] == NULL)
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--arg.cnt;
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count = arg.cnt != -1 ? arg.cnt : 0;
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}
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return count;
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}
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weak_alias (__backtrace, backtrace)
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libc_hidden_def (__backtrace)
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