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c5f7f4fc8b
Test failures: FAIL: debug/tst-backtrace4 FAIL: misc/tst-sigcontext-get_pc The return address of signal handlers is not on the shadow stack.
63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
/* Architecture-specific backtrace implementation. x86-64 version.
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Copyright (C) 2024 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdbool.h>
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#include <sysdep.h>
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/* From libc_sigaction.c. */
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extern void restore_rt (void) asm ("__restore_rt") attribute_hidden;
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/* Copy addresses from the shadow stack if available. */
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static inline __always_inline int
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__arch_backtrace (void **array, int size)
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{
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#if CET_ENABLED
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void **ssp;
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asm ("rdsspq %0"
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: "=r" (ssp)
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: "0" (0));
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if (ssp == NULL)
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return -1;
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void **ssp_base = (void **) THREAD_GETMEM (THREAD_SELF, header.ssp_base);
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if (ssp_base < ssp)
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/* Covers the NULL case. */
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return 0;
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long int limit = ssp_base - ssp;
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if (limit > size)
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limit = size;
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#if 1
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__builtin_memcpy (array, ssp, limit * sizeof (*array));
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return limit;
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#else
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/* We cannot use memcpy because we need to filter out signal
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frames. */
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int count = 0;
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for (unsigned int i = 0; i < limit; ++i)
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if (ssp[i] != restore_rt)
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array[count++] = ssp[i];
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return count;
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#endif
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#else /* !CET_ENABLED */
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return -1;
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#endif
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}
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