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m68k: Remove vDSO support
Although defined in initial TLS/NPTL ABI for m68k and ColdFire [1], kernel support was never pushed upstream. This patch removes the unused m68k vDSO support. Checked with a build against m68k and m68k-coldfire and some basic tests on ARAnyM. * sysdeps/unix/sysv/linux/m68k/Makefile (sysdep_routines, sysdep-rtld-routines): Remove rules. * sysdeps/unix/sysv/linux/m68k/Versions (libc) [GLIBC_PRIVATE]: Remove __vdso_atomic_cmpxchg_32 and __vdso_atomic_barrier. (ld) [GLIBC_PRIVATE]: __rtld___vdso_read_tp, __rtld___vdso_atomic_cmpxchg_32, and __rtld___vdso_atomic_barrier. * sysdeps/unix/sysv/linux/m68k/coldfire/atomic-machine.h (atomic_compare_and_exchange_val_acq, atomic_full_barrier): Remove vDSO path for SHARED. * sysdeps/unix/sysv/linux/m68k/init-first.c: Remove file. * sysdeps/unix/sysv/linux/m68k/libc-m68k-vdso.c: Likewise. * sysdeps/unix/sysv/linux/m68k/m68k-helpers.S: Likewise. * sysdeps/unix/sysv/linux/m68k/m68k-vdso.c: Likewise. * sysdeps/unix/sysv/linux/m68k/m68k-vdso.h: Likewise. * sysdeps/unix/sysv/linux/m68k/m68k-helpers.c: New file. [1] https://lists.debian.org/debian-68k/2007/11/msg00071.html
This commit is contained in:
Adhemerval Zanella
parent
dee07df1a4
commit
112a0ae18b
16
ChangeLog
16
ChangeLog
@ -1,5 +1,21 @@
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2019-06-17 Adhemerval Zanella <adhemerval.zanella@linaro.org>
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* sysdeps/unix/sysv/linux/m68k/Makefile (sysdep_routines,
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sysdep-rtld-routines): Remove rules.
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* sysdeps/unix/sysv/linux/m68k/Versions (libc) [GLIBC_PRIVATE]:
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Remove __vdso_atomic_cmpxchg_32 and __vdso_atomic_barrier.
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(ld) [GLIBC_PRIVATE]: __rtld___vdso_read_tp,
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__rtld___vdso_atomic_cmpxchg_32, and __rtld___vdso_atomic_barrier.
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* sysdeps/unix/sysv/linux/m68k/coldfire/atomic-machine.h
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(atomic_compare_and_exchange_val_acq, atomic_full_barrier): Remove
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vDSO path for SHARED.
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* sysdeps/unix/sysv/linux/m68k/init-first.c: Remove file.
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* sysdeps/unix/sysv/linux/m68k/libc-m68k-vdso.c: Likewise.
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* sysdeps/unix/sysv/linux/m68k/m68k-helpers.S: Likewise.
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* sysdeps/unix/sysv/linux/m68k/m68k-vdso.c: Likewise.
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* sysdeps/unix/sysv/linux/m68k/m68k-vdso.h: Likewise.
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* sysdeps/unix/sysv/linux/m68k/m68k-helpers.c: New file.
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* sysdeps/powerpc/powerpc64/be/fpu/multiarch/Makefile
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(libm-sysdep_routines): Add s_llround-power8, s_llround-power6x,
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s_llround-power5+, s_llround-ppc64, and s_llroundf-ppc64.
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@ -18,8 +18,6 @@ endif
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ifeq ($(subdir),elf)
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sysdep-dl-routines += dl-static
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sysdep_routines += dl-vdso libc-m68k-vdso
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sysdep-rtld-routines += m68k-vdso
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sysdep-others += lddlibc4
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install-bin += lddlibc4
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endif
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@ -40,15 +40,4 @@ libc {
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GLIBC_2.12 {
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__m68k_read_tp;
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}
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GLIBC_PRIVATE {
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__vdso_atomic_cmpxchg_32; __vdso_atomic_barrier;
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}
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}
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ld {
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GLIBC_PRIVATE {
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__rtld___vdso_read_tp;
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__rtld___vdso_atomic_cmpxchg_32;
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__rtld___vdso_atomic_barrier;
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}
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}
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@ -21,7 +21,6 @@
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#include <stdint.h>
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#include <sysdep.h>
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#include <m68k-vdso.h>
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/* Coldfire has no atomic compare-and-exchange operation, but the
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kernel provides userspace atomicity operations. Use them. */
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@ -43,32 +42,6 @@ typedef uintmax_t uatomic_max_t;
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#define ATOMIC_EXCHANGE_USES_CAS 1
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/* The only basic operation needed is compare and exchange. */
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/* For ColdFire we'll have to trap into the kernel mode anyway,
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so trap from the library rather then from the kernel wrapper. */
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#ifdef SHARED
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# define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
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({ \
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/* Use temporary variables to workaround call-clobberness of \
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the registers. */ \
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__typeof (mem) _mem = mem; \
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__typeof (oldval) _oldval = oldval; \
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__typeof (newval) _newval = newval; \
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register uint32_t *_a0 asm ("a0") = (uint32_t *) _mem; \
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register uint32_t _d0 asm ("d0") = (uint32_t) _oldval; \
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register uint32_t _d1 asm ("d1") = (uint32_t) _newval; \
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void *tmp; \
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\
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asm ("movel #_GLOBAL_OFFSET_TABLE_@GOTPC, %2\n\t" \
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"lea (-6, %%pc, %2), %2\n\t" \
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"movel " STR_M68K_VDSO_SYMBOL (__vdso_atomic_cmpxchg_32) \
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"@GOT(%2), %2\n\t" \
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"movel (%2), %2\n\t" \
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"jsr (%2)\n\t" \
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: "+d" (_d0), "+m" (*_a0), "=&a" (tmp) \
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: "a" (_a0), "d" (_d1)); \
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(__typeof (oldval)) _d0; \
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})
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#else
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#define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
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({ \
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/* Use temporary variables to workaround call-clobberness of \
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@ -86,24 +59,8 @@ typedef uintmax_t uatomic_max_t;
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: "a" (_a0), "d" (_d2), "d" (_d1)); \
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(__typeof (oldval)) _d0; \
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})
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#endif
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#ifdef SHARED
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# define atomic_full_barrier() \
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({ \
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void *tmp; \
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\
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asm ("movel #_GLOBAL_OFFSET_TABLE_@GOTPC, %0\n\t" \
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"lea (-6, %pc, %0), %0\n\t" \
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"movel " STR_M68K_VDSO_SYMBOL (__vdso_atomic_barrier) \
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"@GOT(%0), %0\n\t" \
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"movel (%0), %0\n\t" \
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"jsr (%0)\n\t" \
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: "=&a" (tmp)); \
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})
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#else
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# define atomic_full_barrier() \
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(INTERNAL_SYSCALL (atomic_barrier, , 0), (void) 0)
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#endif
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#endif
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@ -1,74 +0,0 @@
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/* Initialization code run first thing by the ELF startup code. Linux/m68k.
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Copyright (C) 2010-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Maxim Kuvyrkov <maxim@codesourcery.com>, 2010.
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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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<http://www.gnu.org/licenses/>. */
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/* Note: linking in vDSO to a static binary requires changes to
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the main GLIBC proper. Not yet implemented. */
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#ifdef SHARED
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#include <dl-vdso.h>
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#include <m68k-vdso.h>
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static inline void
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_libc_vdso_platform_setup (void)
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{
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void *p;
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PREPARE_VERSION (linux26, "LINUX_2.6", 61765110);
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/* It may happen that rtld didn't initialize the vDSO, so fallback
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to the syscall implementations if _dl_vdso_vsym returns NULL.
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This may happen when a static executable dlopen's a dynamic library.
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This really is nothing more than a workaround for rtld/csu
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deficiency. Ideally, init code would setup the vDSO for static
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binaries too. */
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p = _dl_vdso_vsym ("__kernel_read_tp", &linux26);
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if (p != NULL)
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{
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__vdso_read_tp = p;
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__rtld___vdso_read_tp = p;
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}
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else
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assert (__vdso_read_tp == (void *) __vdso_read_tp_stub);
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p = _dl_vdso_vsym ("__kernel_atomic_cmpxchg_32", &linux26);
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if (p != NULL)
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{
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__vdso_atomic_cmpxchg_32 = p;
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__rtld___vdso_atomic_cmpxchg_32 = p;
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}
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else
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assert (__vdso_atomic_cmpxchg_32
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== (void *) __vdso_atomic_cmpxchg_32_stub);
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p = _dl_vdso_vsym ("__kernel_atomic_barrier", &linux26);
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if (p != NULL)
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{
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__vdso_atomic_barrier = p;
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__rtld___vdso_atomic_barrier = p;
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}
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else
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assert (__vdso_atomic_barrier == (void *) __vdso_atomic_barrier_stub);
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}
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#define VDSO_SETUP _libc_vdso_platform_setup
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#endif /* SHARED */
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#include <csu/init-first.c>
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@ -1 +0,0 @@
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#include "m68k-vdso.c"
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@ -1,95 +0,0 @@
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/* Copyright (C) 2010-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Maxim Kuvyrkov <maxim@codesourcery.com>, 2010.
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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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In addition to the permissions in the GNU Lesser General Public
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License, the Free Software Foundation gives you unlimited
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permission to link the compiled version of this file with other
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programs, and to distribute those programs without any restriction
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coming from the use of this file. (The GNU Lesser General Public
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License restrictions do apply in other respects; for example, they
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cover modification of the file, and distribution when not linked
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into another program.)
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Note that people who make modified versions of this file are not
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obligated to grant this special exception for their modified
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versions; it is their choice whether to do so. The GNU Lesser
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General Public License gives permission to release a modified
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version without this exception; this exception also makes it
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possible to release a modified version which carries forward this
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exception.
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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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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <m68k-vdso.h>
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.text
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.hidden __vdso_read_tp_stub
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ENTRY (__vdso_read_tp_stub)
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move.l #__NR_get_thread_area, %d0
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trap #0
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move.l %d0, %a0
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rts
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END (__vdso_read_tp_stub)
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# ifdef SHARED
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/* GCC will emit calls to this routine. Linux has an
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equivalent helper function (which clobbers fewer registers than
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a normal function call) in a vdso; tail call to the
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helper. */
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# if IS_IN (rtld)
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/* rtld gets a hidden copy of __m68k_read_tp. */
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.hidden __m68k_read_tp
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# endif
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ENTRY (__m68k_read_tp)
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LOAD_GOT (%a0)
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move.l M68K_VDSO_SYMBOL (__vdso_read_tp)@GOT(%a0), %a0
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move.l (%a0), %a0
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jmp (%a0)
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END (__m68k_read_tp)
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/* The following two stubs are for macros in atomic.h, they can't
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clobber anything. */
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.hidden __vdso_atomic_cmpxchg_32_stub
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ENTRY (__vdso_atomic_cmpxchg_32_stub)
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move.l %d2, -(%sp)
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cfi_adjust_cfa_offset (4)
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cfi_rel_offset (%d2, 0)
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move.l %d0, %d2
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move.l #SYS_ify (atomic_cmpxchg_32), %d0
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trap #0
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move.l (%sp)+, %d2
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cfi_adjust_cfa_offset (-4)
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cfi_restore (%d2)
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rts
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END (__vdso_atomic_cmpxchg_32_stub)
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.hidden __vdso_atomic_barrier_stub
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ENTRY (__vdso_atomic_barrier_stub)
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move.l %d0, -(%sp)
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cfi_adjust_cfa_offset (4)
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move.l #SYS_ify (atomic_barrier), %d0
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trap #0
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move.l (%sp)+, %d0
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cfi_adjust_cfa_offset (-4)
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rts
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END (__vdso_atomic_barrier_stub)
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# else /* !SHARED */
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/* If the vDSO is not available, use a syscall to get TP. */
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strong_alias (__vdso_read_tp_stub, __m68k_read_tp)
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# endif /* SHARED */
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26
sysdeps/unix/sysv/linux/m68k/m68k-helpers.c
Normal file
26
sysdeps/unix/sysv/linux/m68k/m68k-helpers.c
Normal file
@ -0,0 +1,26 @@
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/* Copyright (C) 2019 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 License as
|
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published by the Free Software Foundation; either version 2.1 of the
|
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License, or (at your option) any later version.
|
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|
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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
|
||||
License along with the GNU C Library; if not, see
|
||||
<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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void *
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__m68k_read_tp (void)
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{
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INTERNAL_SYSCALL_DECL (err);
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return (void*) INTERNAL_SYSCALL_CALL (get_thread_area, err);
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}
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@ -1,34 +0,0 @@
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/* Copyright (C) 2010-2019 Free Software Foundation, Inc.
|
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This file is part of the GNU C Library.
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Contributed by Maxim Kuvyrkov <maxim@codesourcery.com>, 2010.
|
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|
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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.
|
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|
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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
|
||||
<http://www.gnu.org/licenses/>. */
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#ifdef SHARED
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#include <m68k-vdso.h>
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/* Because these pointers are used from other libraries than libc,
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they are exported at GLIBC_PRIVATE version.
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We initialize them to syscall implementation so that they will be ready
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to use from the very beginning. */
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void * M68K_VDSO_SYMBOL (__vdso_read_tp)
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= (void *) __vdso_read_tp_stub;
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void * M68K_VDSO_SYMBOL (__vdso_atomic_cmpxchg_32)
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= (void *) __vdso_atomic_cmpxchg_32_stub;
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void * M68K_VDSO_SYMBOL (__vdso_atomic_barrier)
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= (void *) __vdso_atomic_barrier_stub;
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#endif /* SHARED */
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@ -1,60 +0,0 @@
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/* Resolve function pointers to VDSO functions.
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Copyright (C) 2010-2019 Free Software Foundation, Inc.
|
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This file is part of the GNU C Library.
|
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Contributed by Maxim Kuvyrkov <maxim@codesourcery.com>, 2010.
|
||||
|
||||
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
|
||||
<http://www.gnu.org/licenses/>. */
|
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|
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|
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#ifndef _M68K_VDSO_H
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#define _M68K_VDSO_H
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|
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#ifdef SHARED
|
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|
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# if IS_IN (rtld)
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# define M68K_VDSO_SYMBOL(name) __rtld_##name
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# define STR_M68K_VDSO_SYMBOL(name) "__rtld_" #name
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# else
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# define M68K_VDSO_SYMBOL(name) name
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# define STR_M68K_VDSO_SYMBOL(name) #name
|
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# endif
|
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|
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# ifndef __ASSEMBLER__
|
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|
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/* We define __rtld_* copies for rtld.
|
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We need them visible in libc to initialize. */
|
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# if IS_IN (rtld) || IS_IN (libc)
|
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extern void *__rtld___vdso_read_tp;
|
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extern void *__rtld___vdso_atomic_cmpxchg_32;
|
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extern void *__rtld___vdso_atomic_barrier;
|
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|
||||
/* These stubs are meant to be invoked only from the assembly. */
|
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extern void __vdso_read_tp_stub (void);
|
||||
extern void __vdso_atomic_cmpxchg_32_stub (void);
|
||||
extern void __vdso_atomic_barrier_stub (void);
|
||||
# endif /* IS_IN (rtld) || IS_IN (libc) */
|
||||
|
||||
/* RTLD should only use its own copies. */
|
||||
# if !IS_IN (rtld)
|
||||
extern void *__vdso_read_tp;
|
||||
extern void *__vdso_atomic_cmpxchg_32;
|
||||
extern void *__vdso_atomic_barrier;
|
||||
# endif /* !IS_IN (rtld) */
|
||||
|
||||
# endif /* !__ASSEMBLER__ */
|
||||
|
||||
#endif /* SHARED */
|
||||
|
||||
#endif /* _M68K_VDSO_H */
|
||||
Loading…
Reference in New Issue
Block a user