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Diffstat (limited to 'sysdeps/generic/unwind-link.h')
| -rw-r--r-- | sysdeps/generic/unwind-link.h | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/sysdeps/generic/unwind-link.h b/sysdeps/generic/unwind-link.h new file mode 100644 index 0000000000..3527cebe2d --- /dev/null +++ b/sysdeps/generic/unwind-link.h @@ -0,0 +1,106 @@ +/* Dynamic loading of the libgcc unwinder. Generic version. + Copyright (C) 2021 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#ifndef _UNWIND_LINK_H +#define _UNWIND_LINK_H + +#include <unwind.h> +#include <unwind-arch.h> + +#if !UNWIND_LINK_FRAME_ADJUSTMENT +static inline void * +unwind_arch_adjustment (void *prev, void *addr) +{ + return addr; +} +#endif + +#ifdef SHARED +# include <sysdep.h> +# include <unwind-resume.h> + +# if UNWIND_LINK_FRAME_STATE_FOR +struct frame_state; +# endif + +struct unwind_link +{ + __typeof (_Unwind_Backtrace) *ptr__Unwind_Backtrace; + __typeof (_Unwind_ForcedUnwind) *ptr__Unwind_ForcedUnwind; + __typeof (_Unwind_GetCFA) *ptr__Unwind_GetCFA; +# if UNWIND_LINK_GETIP + __typeof (_Unwind_GetIP) *ptr__Unwind_GetIP; +# endif + __typeof (_Unwind_Resume) *ptr__Unwind_Resume; +#if UNWIND_LINK_FRAME_STATE_FOR + struct frame_state *(*ptr___frame_state_for) (void *, struct frame_state *); +#endif + _Unwind_Reason_Code (*ptr_personality) PERSONALITY_PROTO; + UNWIND_LINK_EXTRA_FIELDS +}; + +/* Return a pointer to the implementation, or NULL on failure. */ +struct unwind_link *__libc_unwind_link_get (void); +libc_hidden_proto (__libc_unwind_link_get) + +/* UNWIND_LINK_PTR returns the stored function pointer NAME from the + cached unwind link OBJ (which was previously returned by + __libc_unwind_link_get). */ +# ifdef PTR_DEMANGLE +# define UNWIND_LINK_PTR(obj, name, ...) \ + ({ \ + __typeof ((obj)->ptr_##name) __unwind_fptr = (obj)->ptr_##name; \ + PTR_DEMANGLE (__unwind_fptr); \ + __unwind_fptr; \ + }) +# else /* !PTR_DEMANGLE */ +# define UNWIND_LINK_PTR(obj, name, ...) ((obj)->ptr_##name) +# endif + +/* Called from fork, in the new subprocess. */ +void __libc_unwind_link_after_fork (void); + +/* Called from __libc_freeres. */ +void __libc_unwind_link_freeres (void) attribute_hidden; + +#else /* !SHARED */ + +/* Dummy implementation so that the code can be shared with the SHARED + version. */ +struct unwind_link; +static inline struct unwind_link * +__libc_unwind_link_get (void) +{ + /* Return something that is not a null pointer, so that error checks + succeed. */ + return (struct unwind_link *) 1; +} + +/* Directly call the static implementation. */ +# define UNWIND_LINK_PTR(obj, name, ...) \ + ((void) (obj), &name) + +static inline void +__libc_unwind_link_after_fork (void) +{ + /* No need to clean up if the unwinder is statically linked. */ +} + +#endif /* !SHARED */ + +#endif /* _UNWIND_LINK_H */ |