#include <gnu/lib-names.h>
#include <stdlib.h>
#include <unwind.h>
-#include <unwind-arch.h>
+#include <unwind-link.h>
struct trace_arg
{
#include <stdlib.h>
#include <set-hooks.h>
#include <libc-internal.h>
+#include <unwind-link.h>
#include "../nss/nsswitch.h"
#include "../libio/libioP.h"
if (&__libpthread_freeres != NULL)
__libpthread_freeres ();
+#ifdef SHARED
+ __libc_unwind_link_freeres ();
+#endif
+
for (p = symbol_set_first_element (__libc_freeres_ptrs);
!symbol_set_end_p (__libc_freeres_ptrs, p); ++p)
free (*p);
fgetxattr flistxattr fremovexattr fsetxattr getxattr \
listxattr lgetxattr llistxattr lremovexattr lsetxattr \
removexattr setxattr getauxval ifunc-impl-list makedev \
- allocate_once fd_to_filename single_threaded
+ allocate_once fd_to_filename single_threaded unwind-link
generated += tst-error1.mtrace tst-error1-mem.out \
tst-allocate_once.mtrace tst-allocate_once-mem.out
__mmap; __munmap; __mprotect;
__sched_get_priority_min; __sched_get_priority_max;
__libc_allocate_once_slow;
+ __libc_unwind_link_get;
}
}
--- /dev/null
+/* Dynamic loading of the libgcc unwinder.
+ 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/>. */
+
+#ifdef SHARED
+
+#include <assert.h>
+#include <dlfcn.h>
+#include <gnu/lib-names.h>
+#include <unwind-link.h>
+#include <libc-lock.h>
+
+/* Statically allocate the object, so that we do not have to deal with
+ malloc failure. __libc_unwind_link_get must not fail if libgcc_s
+ has already been loaded by other means. */
+static struct unwind_link global;
+
+/* dlopen handle. Also used for the double-checked locking idiom. */
+static void *global_libgcc_handle;
+
+/* We cannot use __libc_once because the pthread_once implementation
+ may depend on unwinding. */
+__libc_lock_define (static, lock);
+
+struct unwind_link *
+__libc_unwind_link_get (void)
+{
+ /* Double-checked locking idiom. Synchronizes with the release MO
+ store at the end of this function. */
+ if (atomic_load_acquire (&global_libgcc_handle) != NULL)
+ return &global;
+
+ /* Initialize a copy of the data, so that we do not need about
+ unlocking in case the dynamic loader somehow triggers
+ unwinding. */
+ void *local_libgcc_handle = __libc_dlopen (LIBGCC_S_SO);
+ if (local_libgcc_handle == NULL)
+ {
+ __libc_lock_unlock (lock);
+ return NULL;
+ }
+
+ struct unwind_link local;
+ local.ptr__Unwind_Backtrace
+ = __libc_dlsym (local_libgcc_handle, "_Unwind_Backtrace");
+ local.ptr__Unwind_ForcedUnwind
+ = __libc_dlsym (local_libgcc_handle, "_Unwind_ForcedUnwind");
+ local.ptr__Unwind_GetCFA
+ = __libc_dlsym (local_libgcc_handle, "_Unwind_GetCFA");
+#if UNWIND_LINK_GETIP
+ local.ptr__Unwind_GetIP
+ = __libc_dlsym (local_libgcc_handle, "_Unwind_GetIP");
+#endif
+ local.ptr__Unwind_Resume
+ = __libc_dlsym (local_libgcc_handle, "_Unwind_Resume");
+#if UNWIND_LINK_FRAME_STATE_FOR
+ local.ptr___frame_state_for
+ = __libc_dlsym (local_libgcc_handle, "__frame_state_for");
+#endif
+ local.ptr_personality
+ = __libc_dlsym (local_libgcc_handle, "__gcc_personality_v0");
+ UNWIND_LINK_EXTRA_INIT
+
+ /* If a symbol is missing, libgcc_s has somehow been corrupted. */
+ assert (local.ptr__Unwind_Backtrace != NULL);
+ assert (local.ptr__Unwind_ForcedUnwind != NULL);
+ assert (local.ptr__Unwind_GetCFA != NULL);
+#if UNWIND_LINK_GETIP
+ assert (local.ptr__Unwind_GetIP != NULL);
+#endif
+ assert (local.ptr__Unwind_Resume != NULL);
+ assert (local.ptr_personality != NULL);
+
+#ifdef PTR_MANGLE
+ PTR_MANGLE (local.ptr__Unwind_Backtrace);
+ PTR_MANGLE (local.ptr__Unwind_ForcedUnwind);
+ PTR_MANGLE (local.ptr__Unwind_GetCFA);
+# if UNWIND_LINK_GETIP
+ PTR_MANGLE (local.ptr__Unwind_GetIP);
+# endif
+ PTR_MANGLE (local.ptr__Unwind_Resume);
+# if UNWIND_LINK_FRAME_STATE_FOR
+ PTR_MANGLE (local.ptr___frame_state_for);
+# endif
+ PTR_MANGLE (local.ptr_personality);
+#endif
+
+ __libc_lock_lock (lock);
+ if (atomic_load_relaxed (&global_libgcc_handle) != NULL)
+ /* This thread lost the race. Clean up. */
+ __libc_dlclose (local_libgcc_handle);
+ else
+ {
+ global = local;
+
+ /* Completes the double-checked locking idiom. */
+ atomic_store_release (&global_libgcc_handle, local_libgcc_handle);
+ }
+
+ __libc_lock_unlock (lock);
+ return &global;
+}
+libc_hidden_def (__libc_unwind_link_get)
+
+void
+__libc_unwind_link_after_fork (void)
+{
+ if (__libc_lock_trylock (lock) == 0)
+ /* The lock was not acquired during the fork. This covers both
+ the initialized and uninitialized case. */
+ __libc_lock_unlock (lock);
+ else
+ {
+ /* Initialization was in progress in another thread.
+ Reinitialize the lock. */
+ __libc_lock_init (lock);
+ global_libgcc_handle = NULL;
+ }
+}
+
+void __libc_freeres_fn_section
+__libc_unwind_link_freeres (void)
+{
+ if (global_libgcc_handle != NULL)
+ {
+ __libc_dlclose (global_libgcc_handle );
+ global_libgcc_handle = NULL;
+ }
+}
+
+#endif /* SHARED */
--- /dev/null
+/* Dynamic loading of the libgcc unwinder. alpha customization.
+ 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 _ARCH_UNWIND_LINK_H
+#define _ARCH_UNWIND_LINK_H
+
+#define UNWIND_LINK_GETIP 1
+#define UNWIND_LINK_FRAME_STATE_FOR 1
+#define UNWIND_LINK_FRAME_ADJUSTMENT 0
+#define UNWIND_LINK_EXTRA_FIELDS
+#define UNWIND_LINK_EXTRA_INIT
+
+#endif /* _ARCH_UNWIND_LINK_H */
--- /dev/null
+/* Dynamic loading of the libgcc unwinder. Arm customization.
+ 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 _ARCH_UNWIND_LINK_H
+#define _ARCH_UNWIND_LINK_H
+
+/* On arm, _Unwind_GetIP is a macro. */
+#define UNWIND_LINK_GETIP 0
+
+#define UNWIND_LINK_FRAME_STATE_FOR 0
+#define UNWIND_LINK_FRAME_ADJUSTMENT 0
+#define UNWIND_LINK_EXTRA_FIELDS \
+ __typeof (_Unwind_VRS_Get) *ptr__Unwind_VRS_Get;
+#define UNWIND_LINK_EXTRA_INIT \
+ local.ptr__Unwind_VRS_Get \
+ = __libc_dlsym (local_libgcc_handle, "_Unwind_VRS_Get"); \
+ assert (local.ptr__Unwind_VRS_Get != NULL); \
+ PTR_MANGLE (local.ptr__Unwind_VRS_Get);
+
+#endif /* _ARCH_UNWIND_LINK_H */
-/* Return backtrace of current program state. Arch-specific bits.
- Copyright (C) 2020-2021 Free Software Foundation, Inc.
+/* Dynamic loading of the libgcc unwinder. Generic version of parameters.
+ 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
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
-#ifndef _UNWIND_ARCH_H
-#define _UNWIND_ARCH_H
+#ifndef _ARCH_UNWIND_LINK_H
+#define _ARCH_UNWIND_LINK_H
-#include <unwind.h>
+/* The _Unwind_GetIP function is supported. */
+#define UNWIND_LINK_GETIP 1
-static inline void *
-unwind_arch_adjustment (void *prev, void *addr)
-{
- return addr;
-}
+/* The __frame_state_for function is needed and re-exported from glibc. */
+#define UNWIND_LINK_FRAME_STATE_FOR 0
-#endif
+/* No adjustment of the is needed. */
+#define UNWIND_LINK_FRAME_ADJUSTMENT 0
+
+/* There are no extra fields in struct unwind_link in the generic version. */
+#define UNWIND_LINK_EXTRA_FIELDS
+#define UNWIND_LINK_EXTRA_INIT
+
+#endif /* _ARCH_UNWIND_LINK_H */
--- /dev/null
+/* 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 */
--- /dev/null
+/* Dynamic loading of the libgcc unwinder. i386 customization.
+ 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 _ARCH_UNWIND_LINK_H
+#define _ARCH_UNWIND_LINK_H
+
+#define UNWIND_LINK_GETIP 1
+#define UNWIND_LINK_FRAME_STATE_FOR 1
+#define UNWIND_LINK_FRAME_ADJUSTMENT 0
+#define UNWIND_LINK_EXTRA_FIELDS \
+ __typeof (_Unwind_GetGR) *ptr__Unwind_GetGR;
+#define UNWIND_LINK_EXTRA_INIT_SHARED \
+ local.ptr__Unwind_GetGR \
+ = __libc_dlsym (local_libgcc_handle, "_Unwind_GetGR"); \
+ assert (local.ptr__Unwind_GetGR != NULL);
+#ifdef PTR_MANGLE
+# define UNWIND_LINK_EXTRA_INIT \
+ UNWIND_LINK_EXTRA_INIT_SHARED \
+ PTR_MANGLE (local.ptr__Unwind_GetGR);
+#else
+# define UNWIND_LINK_EXTRA_INIT UNWIND_LINK_EXTRA_INIT_SHARED
+#endif
+
+#endif /* _ARCH_UNWIND_LINK_H */
--- /dev/null
+/* Dynamic loading of the libgcc unwinder. ia64 customization.
+ 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 _ARCH_UNWIND_LINK_H
+
+#define UNWIND_LINK_GETIP 1
+#define UNWIND_LINK_FRAME_STATE_FOR 1
+#define UNWIND_LINK_FRAME_ADJUSTMENT 0
+#define UNWIND_LINK_EXTRA_FIELDS \
+ __typeof (_Unwind_GetBSP) *ptr__Unwind_GetBSP;
+#define UNWIND_LINK_EXTRA_INIT \
+ local.ptr__Unwind_GetBSP \
+ = __libc_dlsym (local_libgcc_handle, "_Unwind_GetBSP"); \
+ assert (local.ptr__Unwind_GetBSP != NULL); \
+ PTR_MANGLE (local.ptr__Unwind_GetBSP);
+
+#endif /* _ARCH_UNWIND_LINK_H */
--- /dev/null
+/* Dynamic loading of the libgcc unwinder. Baseline m68k customization.
+ 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 _ARCH_UNWIND_LINK_H
+
+#include <sysdeps/m68k/unwind-arch.h>
+
+#undef UNWIND_LINK_FRAME_STATE_FOR
+#define UNWIND_LINK_FRAME_STATE_FOR 1
+
+#endif /* _ARCH_UNWIND_LINK_H */
--- /dev/null
+/* Dynamic loading of the libgcc unwinder. m68k customization.
+ 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 _ARCH_UNWIND_LINK_H
+#define _ARCH_UNWIND_LINK_H
+
+#define UNWIND_LINK_GETIP 1
+#define UNWIND_LINK_FRAME_ADJUSTMENT 0
+#define UNWIND_LINK_EXTRA_FIELDS \
+ __typeof (_Unwind_GetGR) *ptr__Unwind_GetGR;
+#define UNWIND_LINK_EXTRA_INIT \
+ local.ptr__Unwind_GetGR \
+ = __libc_dlsym (local_libgcc_handle, "_Unwind_GetGR"); \
+ assert (local.ptr__Unwind_GetGR != NULL); \
+ PTR_MANGLE (local.ptr__Unwind_GetGR);
+
+/* This is overriden by the m680x0 variant. */
+#define UNWIND_LINK_FRAME_STATE_FOR 0
+
+#endif /* _ARCH_UNWIND_LINK_H */
#include <tls.h>
#include <malloc/malloc-internal.h>
#include <nss/nss_database.h>
+#include <unwind-link.h>
#undef __fork
__sigemptyset (&_hurd_global_sigstate->pending);
__sigemptyset (&ss->pending);
+ __libc_unwind_link_after_fork ();
+
/* Release malloc locks. */
_hurd_malloc_fork_child ();
call_function_static_weak (__malloc_fork_unlock_child);
-/* Return backtrace of current program state. Arch-specific bits.
+/* Dynamic loading of the libgcc unwinder. MIPS customization.
Copyright (C) 2020-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
-#ifndef _UNWIND_ARCH_H
-#define _UNWIND_ARCH_H
+#ifndef _ARCH_UNWIND_LINK_H
+#define _ARCH_UNWIND_LINK_H
#include <stdint.h>
+#include <sys/syscall.h>
+
+#define UNWIND_LINK_GETIP 1
+#define UNWIND_LINK_FRAME_STATE_FOR 1
+#define UNWIND_LINK_FRAME_ADJUSTMENT 1
+#define UNWIND_LINK_EXTRA_FIELDS
+#define UNWIND_LINK_EXTRA_INIT
/* MIPS fallback code handle a frame where its FDE can not be obtained
(for instance a signal frame) by reading the kernel allocated signal frame
24021061 li v0, 0x1061 (rt_sigreturn)
0000000c syscall
- or
+ or
24021017 li v0, 0x1017 (sigreturn)
0000000c syscall */
if (pc[1] != 0x0000000c)
return addr;
}
-#endif
+#endif /* _ARCH_UNWIND_LINK_H */
#include <futex-internal.h>
#include <malloc/malloc-internal.h>
#include <nss/nss_database.h>
+#include <unwind-link.h>
static void
fresetlockfiles (void)
/* Reset the lock state in the multi-threaded case. */
if (multiple_threads)
{
+ __libc_unwind_link_after_fork ();
+
/* Release malloc locks. */
call_function_static_weak (__malloc_fork_unlock_child);
--- /dev/null
+/* Dynamic loading of the libgcc unwinder. powerpc customization.
+ 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 _ARCH_UNWIND_LINK_H
+#define _ARCH_UNWIND_LINK_H
+
+#define UNWIND_LINK_GETIP 1
+#define UNWIND_LINK_FRAME_STATE_FOR 1
+#define UNWIND_LINK_FRAME_ADJUSTMENT 0
+#define UNWIND_LINK_EXTRA_FIELDS
+#define UNWIND_LINK_EXTRA_INIT
+
+#endif /* _ARCH_UNWIND_LINK_H */
--- /dev/null
+/* Dynamic loading of the libgcc unwinder. S/390 customization.
+ 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 _ARCH_UNWIND_LINK_H
+#define _ARCH_UNWIND_LINK_H
+
+#define UNWIND_LINK_GETIP 1
+#define UNWIND_LINK_FRAME_STATE_FOR 1
+#define UNWIND_LINK_FRAME_ADJUSTMENT 0
+#define UNWIND_LINK_EXTRA_FIELDS
+#define UNWIND_LINK_EXTRA_INIT
+
+#endif /* _ARCH_UNWIND_LINK_H */
--- /dev/null
+/* Dynamic loading of the libgcc unwinder. SH customization.
+ 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 _ARCH_UNWIND_LINK_H
+#define _ARCH_UNWIND_LINK_H
+
+#define UNWIND_LINK_GETIP 1
+#define UNWIND_LINK_FRAME_STATE_FOR 1
+#define UNWIND_LINK_FRAME_ADJUSTMENT 0
+#define UNWIND_LINK_EXTRA_FIELDS
+#define UNWIND_LINK_EXTRA_INIT
+
+#endif /* _ARCH_UNWIND_LINK_H */
--- /dev/null
+/* Dynamic loading of the libgcc unwinder. SPARC customization.
+ 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 _ARCH_UNWIND_LINK_H
+#define _ARCH_UNWIND_LINK_H
+
+#define UNWIND_LINK_GETIP 1
+#define UNWIND_LINK_FRAME_STATE_FOR 1
+#define UNWIND_LINK_FRAME_ADJUSTMENT 0
+#define UNWIND_LINK_EXTRA_FIELDS
+#define UNWIND_LINK_EXTRA_INIT
+
+#endif /* _ARCH_UNWIND_LINK_H */