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9fc813e1a3
This will be used to consolidate the libgcc_s access for backtrace and pthread_cancel. Unlike the existing backtrace implementations, it provides some hardening based on pointer mangling. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
107 lines
3.2 KiB
C
107 lines
3.2 KiB
C
/* Dynamic loading of the libgcc unwinder. Generic version.
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Copyright (C) 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 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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#ifndef _UNWIND_LINK_H
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#define _UNWIND_LINK_H
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#include <unwind.h>
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#include <unwind-arch.h>
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#if !UNWIND_LINK_FRAME_ADJUSTMENT
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static inline void *
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unwind_arch_adjustment (void *prev, void *addr)
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{
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return addr;
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}
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#endif
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#ifdef SHARED
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# include <sysdep.h>
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# include <unwind-resume.h>
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# if UNWIND_LINK_FRAME_STATE_FOR
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struct frame_state;
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# endif
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struct unwind_link
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{
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__typeof (_Unwind_Backtrace) *ptr__Unwind_Backtrace;
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__typeof (_Unwind_ForcedUnwind) *ptr__Unwind_ForcedUnwind;
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__typeof (_Unwind_GetCFA) *ptr__Unwind_GetCFA;
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# if UNWIND_LINK_GETIP
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__typeof (_Unwind_GetIP) *ptr__Unwind_GetIP;
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# endif
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__typeof (_Unwind_Resume) *ptr__Unwind_Resume;
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#if UNWIND_LINK_FRAME_STATE_FOR
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struct frame_state *(*ptr___frame_state_for) (void *, struct frame_state *);
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#endif
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_Unwind_Reason_Code (*ptr_personality) PERSONALITY_PROTO;
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UNWIND_LINK_EXTRA_FIELDS
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};
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/* Return a pointer to the implementation, or NULL on failure. */
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struct unwind_link *__libc_unwind_link_get (void);
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libc_hidden_proto (__libc_unwind_link_get)
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/* UNWIND_LINK_PTR returns the stored function pointer NAME from the
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cached unwind link OBJ (which was previously returned by
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__libc_unwind_link_get). */
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# ifdef PTR_DEMANGLE
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# define UNWIND_LINK_PTR(obj, name, ...) \
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({ \
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__typeof ((obj)->ptr_##name) __unwind_fptr = (obj)->ptr_##name; \
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PTR_DEMANGLE (__unwind_fptr); \
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__unwind_fptr; \
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})
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# else /* !PTR_DEMANGLE */
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# define UNWIND_LINK_PTR(obj, name, ...) ((obj)->ptr_##name)
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# endif
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/* Called from fork, in the new subprocess. */
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void __libc_unwind_link_after_fork (void);
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/* Called from __libc_freeres. */
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void __libc_unwind_link_freeres (void) attribute_hidden;
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#else /* !SHARED */
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/* Dummy implementation so that the code can be shared with the SHARED
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version. */
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struct unwind_link;
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static inline struct unwind_link *
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__libc_unwind_link_get (void)
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{
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/* Return something that is not a null pointer, so that error checks
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succeed. */
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return (struct unwind_link *) 1;
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}
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/* Directly call the static implementation. */
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# define UNWIND_LINK_PTR(obj, name, ...) \
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((void) (obj), &name)
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static inline void
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__libc_unwind_link_after_fork (void)
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{
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/* No need to clean up if the unwinder is statically linked. */
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}
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#endif /* !SHARED */
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#endif /* _UNWIND_LINK_H */
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