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Implement <unwind-link.h> for dynamically loading the libgcc_s unwinder 

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>
This commit is contained in:
Florian Weimer 2021-03-01 15:56:36 +01:00
parent 764e9a0334
commit 9fc813e1a3
20 changed files with 600 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
debug/backtrace.c
View File

@ -23,7 +23,7 @@
#include <gnu/lib-names.h>
#include <stdlib.h>
#include <unwind.h>
#include <unwind-arch.h>
#include <unwind-link.h>
struct trace_arg
{

5
malloc/set-freeres.c
View File

@ -19,6 +19,7 @@
#include <stdlib.h>
#include <set-hooks.h>
#include <libc-internal.h>
#include <unwind-link.h>
#include "../nss/nsswitch.h"
#include "../libio/libioP.h"
@ -61,6 +62,10 @@ __libc_freeres (void)
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);

2
misc/Makefile
View File

@ -73,7 +73,7 @@ routines := brk sbrk sstk ioctl \
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

1
misc/Versions
View File

@ -172,5 +172,6 @@ libc {
__mmap; __munmap; __mprotect;
__sched_get_priority_min; __sched_get_priority_max;
__libc_allocate_once_slow;
__libc_unwind_link_get;
}
}

145
misc/unwind-link.c Normal file
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@ -0,0 +1,145 @@
/* 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 */

28
sysdeps/alpha/unwind-arch.h Normal file
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@ -0,0 +1,28 @@
/* 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 */

35
sysdeps/arm/unwind-arch.h Normal file
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@ -0,0 +1,35 @@
/* 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 */

27
sysdeps/generic/unwind-arch.h
View File

@ -1,5 +1,5 @@
/* 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
@ -16,15 +16,20 @@
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 */

106
sysdeps/generic/unwind-link.h Normal file
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@ -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 */

39
sysdeps/i386/unwind-arch.h Normal file
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@ -0,0 +1,39 @@
/* 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 */

32
sysdeps/ia64/unwind-arch.h Normal file
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@ -0,0 +1,32 @@
/* 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 */

26
sysdeps/m68k/m680x0/unwind-arch.h Normal file
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@ -0,0 +1,26 @@
/* 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 */

35
sysdeps/m68k/unwind-arch.h Normal file
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@ -0,0 +1,35 @@
/* 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 */

3
sysdeps/mach/hurd/fork.c
View File

@ -29,6 +29,7 @@
#include <tls.h>
#include <malloc/malloc-internal.h>
#include <nss/nss_database.h>
#include <unwind-link.h>
#undef __fork
@ -667,6 +668,8 @@ __fork (void)
__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);

17
sysdeps/unix/sysv/linux/mips/unwind-arch.h → sysdeps/mips/unwind-arch.h
View File

@ -1,4 +1,4 @@
/* 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.
@ -16,10 +16,17 @@
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
@ -49,7 +56,7 @@ unwind_arch_adjustment (void *prev, void *addr)
24021061 li v0, 0x1061 (rt_sigreturn)
0000000c syscall
or
or
24021017 li v0, 0x1017 (sigreturn)
0000000c syscall */
if (pc[1] != 0x0000000c)
@ -64,4 +71,4 @@ unwind_arch_adjustment (void *prev, void *addr)
return addr;
}
#endif
#endif /* _ARCH_UNWIND_LINK_H */

3
sysdeps/nptl/fork.c
View File

@ -33,6 +33,7 @@
#include <futex-internal.h>
#include <malloc/malloc-internal.h>
#include <nss/nss_database.h>
#include <unwind-link.h>
static void
fresetlockfiles (void)
@ -116,6 +117,8 @@ __libc_fork (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);

28
sysdeps/powerpc/powerpc32/unwind-arch.h Normal file
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@ -0,0 +1,28 @@
/* 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 */

28
sysdeps/s390/unwind-arch.h Normal file
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@ -0,0 +1,28 @@
/* 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 */

28
sysdeps/sh/unwind-arch.h Normal file
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@ -0,0 +1,28 @@
/* 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 */

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sysdeps/sparc/unwind-arch.h Normal file
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/* 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 */