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e4b68f9248
Allow callers to arm a sigjmp_buf on a registered mapping so the
SIGBUS handler can siglongjmp instead of remapping and retrying the
faulting instruction.
Needed when the mapping contains objects that are unsafe to resume
on after a replace.
This is preparation work for the next commit where that mechanism is
used.
Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
Assisted-by: AI
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/2270>
(cherry picked from commit 7a0b3e2197)
80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
/*
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* Copyright © 2013 Keith Packard
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#ifndef _BUSFAULT_H_
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#define _BUSFAULT_H_
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#include <dix-config.h>
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typedef void (*busfault_notify_ptr) (void *context);
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#ifdef HAVE_SIGACTION
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#include <sys/types.h>
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#include <setjmp.h>
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struct busfault *
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busfault_register_mmap(void *addr, size_t size, busfault_notify_ptr notify, void *context);
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void
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busfault_unregister(struct busfault *busfault);
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/*
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* If jmp is non-NULL when a SIGBUS hits this mapping, the handler
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* siglongjmps there instead of remapping and retrying the faulting
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* instruction. Callers must use sigsetjmp(..., 1).
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* Pass NULL to clear.
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*/
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void
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busfault_set_jmp(struct busfault *busfault, sigjmp_buf *jmp);
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void
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busfault_check(void);
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void busfault_init(void);
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#else
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struct busfault;
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static inline struct busfault *
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busfault_register_mmap(void *addr, size_t size, busfault_notify_ptr notify, void *context)
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{
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(void) addr;
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(void) size;
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(void) notify;
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(void) context;
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return NULL;
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}
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static inline void
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busfault_unregister(struct busfault *busfault)
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{
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(void) busfault;
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}
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static inline void busfault_check(void) {}
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static inline void busfault_init(void) {}
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#endif
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#endif /* _BUSFAULT_H_ */
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