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authorAdhemerval Zanella <adhemerval.zanella@linaro.org>2019-05-29 18:39:06 -0300
committerAdhemerval Zanella <adhemerval.zanella@linaro.org>2019-06-17 09:29:01 -0300
commit112a0ae18b831bf31f44d81b82666980312511d6 (patch)
tree8296ec9b2cf3a21ed1012149c05dadb7fc5738c9
parentdee07df1a40533f1f2856111946eafbd45b81dbe (diff)
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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
-rw-r--r--ChangeLog16
-rw-r--r--sysdeps/unix/sysv/linux/m68k/Makefile2
-rw-r--r--sysdeps/unix/sysv/linux/m68k/Versions11
-rw-r--r--sysdeps/unix/sysv/linux/m68k/coldfire/atomic-machine.h45
-rw-r--r--sysdeps/unix/sysv/linux/m68k/init-first.c74
-rw-r--r--sysdeps/unix/sysv/linux/m68k/libc-m68k-vdso.c1
-rw-r--r--sysdeps/unix/sysv/linux/m68k/m68k-helpers.S95
-rw-r--r--sysdeps/unix/sysv/linux/m68k/m68k-helpers.c26
-rw-r--r--sysdeps/unix/sysv/linux/m68k/m68k-vdso.c34
-rw-r--r--sysdeps/unix/sysv/linux/m68k/m68k-vdso.h60
10 files changed, 43 insertions, 321 deletions
diff --git a/ChangeLog b/ChangeLog
index ba282120bbb..2f5dac51902 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,21 @@
2019-06-17 Adhemerval Zanella <adhemerval.zanella@linaro.org>
+ * 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.
+
* sysdeps/powerpc/powerpc64/be/fpu/multiarch/Makefile
(libm-sysdep_routines): Add s_llround-power8, s_llround-power6x,
s_llround-power5+, s_llround-ppc64, and s_llroundf-ppc64.
diff --git a/sysdeps/unix/sysv/linux/m68k/Makefile b/sysdeps/unix/sysv/linux/m68k/Makefile
index ce1f696a6fb..be40fae68a2 100644
--- a/sysdeps/unix/sysv/linux/m68k/Makefile
+++ b/sysdeps/unix/sysv/linux/m68k/Makefile
@@ -18,8 +18,6 @@ endif
ifeq ($(subdir),elf)
sysdep-dl-routines += dl-static
-sysdep_routines += dl-vdso libc-m68k-vdso
-sysdep-rtld-routines += m68k-vdso
sysdep-others += lddlibc4
install-bin += lddlibc4
endif
diff --git a/sysdeps/unix/sysv/linux/m68k/Versions b/sysdeps/unix/sysv/linux/m68k/Versions
index 7ecc96ea972..8e72cd18cb5 100644
--- a/sysdeps/unix/sysv/linux/m68k/Versions
+++ b/sysdeps/unix/sysv/linux/m68k/Versions
@@ -40,15 +40,4 @@ libc {
GLIBC_2.12 {
__m68k_read_tp;
}
- GLIBC_PRIVATE {
- __vdso_atomic_cmpxchg_32; __vdso_atomic_barrier;
- }
-}
-
-ld {
- GLIBC_PRIVATE {
- __rtld___vdso_read_tp;
- __rtld___vdso_atomic_cmpxchg_32;
- __rtld___vdso_atomic_barrier;
- }
}
diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/atomic-machine.h b/sysdeps/unix/sysv/linux/m68k/coldfire/atomic-machine.h
index 7465a98fef8..0a2aa9ffa50 100644
--- a/sysdeps/unix/sysv/linux/m68k/coldfire/atomic-machine.h
+++ b/sysdeps/unix/sysv/linux/m68k/coldfire/atomic-machine.h
@@ -21,7 +21,6 @@
#include <stdint.h>
#include <sysdep.h>
-#include <m68k-vdso.h>
/* Coldfire has no atomic compare-and-exchange operation, but the
kernel provides userspace atomicity operations. Use them. */
@@ -43,33 +42,7 @@ typedef uintmax_t uatomic_max_t;
#define ATOMIC_EXCHANGE_USES_CAS 1
/* The only basic operation needed is compare and exchange. */
-/* For ColdFire we'll have to trap into the kernel mode anyway,
- so trap from the library rather then from the kernel wrapper. */
-#ifdef SHARED
-# define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
- ({ \
- /* Use temporary variables to workaround call-clobberness of \
- the registers. */ \
- __typeof (mem) _mem = mem; \
- __typeof (oldval) _oldval = oldval; \
- __typeof (newval) _newval = newval; \
- register uint32_t *_a0 asm ("a0") = (uint32_t *) _mem; \
- register uint32_t _d0 asm ("d0") = (uint32_t) _oldval; \
- register uint32_t _d1 asm ("d1") = (uint32_t) _newval; \
- void *tmp; \
- \
- asm ("movel #_GLOBAL_OFFSET_TABLE_@GOTPC, %2\n\t" \
- "lea (-6, %%pc, %2), %2\n\t" \
- "movel " STR_M68K_VDSO_SYMBOL (__vdso_atomic_cmpxchg_32) \
- "@GOT(%2), %2\n\t" \
- "movel (%2), %2\n\t" \
- "jsr (%2)\n\t" \
- : "+d" (_d0), "+m" (*_a0), "=&a" (tmp) \
- : "a" (_a0), "d" (_d1)); \
- (__typeof (oldval)) _d0; \
- })
-#else
-# define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
+#define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
({ \
/* Use temporary variables to workaround call-clobberness of \
the registers. */ \
@@ -86,24 +59,8 @@ typedef uintmax_t uatomic_max_t;
: "a" (_a0), "d" (_d2), "d" (_d1)); \
(__typeof (oldval)) _d0; \
})
-#endif
-#ifdef SHARED
-# define atomic_full_barrier() \
- ({ \
- void *tmp; \
- \
- asm ("movel #_GLOBAL_OFFSET_TABLE_@GOTPC, %0\n\t" \
- "lea (-6, %pc, %0), %0\n\t" \
- "movel " STR_M68K_VDSO_SYMBOL (__vdso_atomic_barrier) \
- "@GOT(%0), %0\n\t" \
- "movel (%0), %0\n\t" \
- "jsr (%0)\n\t" \
- : "=&a" (tmp)); \
- })
-#else
# define atomic_full_barrier() \
(INTERNAL_SYSCALL (atomic_barrier, , 0), (void) 0)
-#endif
#endif
diff --git a/sysdeps/unix/sysv/linux/m68k/init-first.c b/sysdeps/unix/sysv/linux/m68k/init-first.c
deleted file mode 100644
index f8f09108393..00000000000
--- a/sysdeps/unix/sysv/linux/m68k/init-first.c
+++ /dev/null
@@ -1,74 +0,0 @@
-/* Initialization code run first thing by the ELF startup code. Linux/m68k.
- Copyright (C) 2010-2019 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- 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/>. */
-
-/* Note: linking in vDSO to a static binary requires changes to
- the main GLIBC proper. Not yet implemented. */
-#ifdef SHARED
-
-#include <dl-vdso.h>
-#include <m68k-vdso.h>
-
-static inline void
-_libc_vdso_platform_setup (void)
-{
- void *p;
-
- PREPARE_VERSION (linux26, "LINUX_2.6", 61765110);
-
- /* It may happen that rtld didn't initialize the vDSO, so fallback
- to the syscall implementations if _dl_vdso_vsym returns NULL.
- This may happen when a static executable dlopen's a dynamic library.
- This really is nothing more than a workaround for rtld/csu
- deficiency. Ideally, init code would setup the vDSO for static
- binaries too. */
-
- p = _dl_vdso_vsym ("__kernel_read_tp", &linux26);
- if (p != NULL)
- {
- __vdso_read_tp = p;
- __rtld___vdso_read_tp = p;
- }
- else
- assert (__vdso_read_tp == (void *) __vdso_read_tp_stub);
-
- p = _dl_vdso_vsym ("__kernel_atomic_cmpxchg_32", &linux26);
- if (p != NULL)
- {
- __vdso_atomic_cmpxchg_32 = p;
- __rtld___vdso_atomic_cmpxchg_32 = p;
- }
- else
- assert (__vdso_atomic_cmpxchg_32
- == (void *) __vdso_atomic_cmpxchg_32_stub);
-
- p = _dl_vdso_vsym ("__kernel_atomic_barrier", &linux26);
- if (p != NULL)
- {
- __vdso_atomic_barrier = p;
- __rtld___vdso_atomic_barrier = p;
- }
- else
- assert (__vdso_atomic_barrier == (void *) __vdso_atomic_barrier_stub);
-}
-
-#define VDSO_SETUP _libc_vdso_platform_setup
-
-#endif /* SHARED */
-
-#include <csu/init-first.c>
diff --git a/sysdeps/unix/sysv/linux/m68k/libc-m68k-vdso.c b/sysdeps/unix/sysv/linux/m68k/libc-m68k-vdso.c
deleted file mode 100644
index 45982e99b9b..00000000000
--- a/sysdeps/unix/sysv/linux/m68k/libc-m68k-vdso.c
+++ /dev/null
@@ -1 +0,0 @@
-#include "m68k-vdso.c"
diff --git a/sysdeps/unix/sysv/linux/m68k/m68k-helpers.S b/sysdeps/unix/sysv/linux/m68k/m68k-helpers.S
deleted file mode 100644
index 5e3ffb0a7f9..00000000000
--- a/sysdeps/unix/sysv/linux/m68k/m68k-helpers.S
+++ /dev/null
@@ -1,95 +0,0 @@
-/* Copyright (C) 2010-2019 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- 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.
-
- In addition to the permissions in the GNU Lesser General Public
- License, the Free Software Foundation gives you unlimited
- permission to link the compiled version of this file with other
- programs, and to distribute those programs without any restriction
- coming from the use of this file. (The GNU Lesser General Public
- License restrictions do apply in other respects; for example, they
- cover modification of the file, and distribution when not linked
- into another program.)
-
- Note that people who make modified versions of this file are not
- obligated to grant this special exception for their modified
- versions; it is their choice whether to do so. The GNU Lesser
- General Public License gives permission to release a modified
- version without this exception; this exception also makes it
- possible to release a modified version which carries forward this
- exception.
-
- 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/>. */
-
-#include <sysdep.h>
-#include <m68k-vdso.h>
-
- .text
-
- .hidden __vdso_read_tp_stub
-ENTRY (__vdso_read_tp_stub)
- move.l #__NR_get_thread_area, %d0
- trap #0
- move.l %d0, %a0
- rts
-END (__vdso_read_tp_stub)
-
-# ifdef SHARED
-/* GCC will emit calls to this routine. Linux has an
- equivalent helper function (which clobbers fewer registers than
- a normal function call) in a vdso; tail call to the
- helper. */
-# if IS_IN (rtld)
-/* rtld gets a hidden copy of __m68k_read_tp. */
- .hidden __m68k_read_tp
-# endif
-ENTRY (__m68k_read_tp)
- LOAD_GOT (%a0)
- move.l M68K_VDSO_SYMBOL (__vdso_read_tp)@GOT(%a0), %a0
- move.l (%a0), %a0
- jmp (%a0)
-END (__m68k_read_tp)
-
-/* The following two stubs are for macros in atomic.h, they can't
- clobber anything. */
-
- .hidden __vdso_atomic_cmpxchg_32_stub
-ENTRY (__vdso_atomic_cmpxchg_32_stub)
- move.l %d2, -(%sp)
- cfi_adjust_cfa_offset (4)
- cfi_rel_offset (%d2, 0)
- move.l %d0, %d2
- move.l #SYS_ify (atomic_cmpxchg_32), %d0
- trap #0
- move.l (%sp)+, %d2
- cfi_adjust_cfa_offset (-4)
- cfi_restore (%d2)
- rts
-END (__vdso_atomic_cmpxchg_32_stub)
-
- .hidden __vdso_atomic_barrier_stub
-ENTRY (__vdso_atomic_barrier_stub)
- move.l %d0, -(%sp)
- cfi_adjust_cfa_offset (4)
- move.l #SYS_ify (atomic_barrier), %d0
- trap #0
- move.l (%sp)+, %d0
- cfi_adjust_cfa_offset (-4)
- rts
-END (__vdso_atomic_barrier_stub)
-# else /* !SHARED */
-/* If the vDSO is not available, use a syscall to get TP. */
- strong_alias (__vdso_read_tp_stub, __m68k_read_tp)
-# endif /* SHARED */
diff --git a/sysdeps/unix/sysv/linux/m68k/m68k-helpers.c b/sysdeps/unix/sysv/linux/m68k/m68k-helpers.c
new file mode 100644
index 00000000000..df02d560aa5
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/m68k/m68k-helpers.c
@@ -0,0 +1,26 @@
+/* Copyright (C) 2019 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
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+
+void *
+__m68k_read_tp (void)
+{
+ INTERNAL_SYSCALL_DECL (err);
+ return (void*) INTERNAL_SYSCALL_CALL (get_thread_area, err);
+}
diff --git a/sysdeps/unix/sysv/linux/m68k/m68k-vdso.c b/sysdeps/unix/sysv/linux/m68k/m68k-vdso.c
deleted file mode 100644
index a1345a3a5bd..00000000000
--- a/sysdeps/unix/sysv/linux/m68k/m68k-vdso.c
+++ /dev/null
@@ -1,34 +0,0 @@
-/* Copyright (C) 2010-2019 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- 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/>. */
-
-#ifdef SHARED
-
-#include <m68k-vdso.h>
-
-/* Because these pointers are used from other libraries than libc,
- they are exported at GLIBC_PRIVATE version.
- We initialize them to syscall implementation so that they will be ready
- to use from the very beginning. */
-void * M68K_VDSO_SYMBOL (__vdso_read_tp)
-= (void *) __vdso_read_tp_stub;
-void * M68K_VDSO_SYMBOL (__vdso_atomic_cmpxchg_32)
-= (void *) __vdso_atomic_cmpxchg_32_stub;
-void * M68K_VDSO_SYMBOL (__vdso_atomic_barrier)
-= (void *) __vdso_atomic_barrier_stub;
-
-#endif /* SHARED */
diff --git a/sysdeps/unix/sysv/linux/m68k/m68k-vdso.h b/sysdeps/unix/sysv/linux/m68k/m68k-vdso.h
deleted file mode 100644
index fc71c0f4e1a..00000000000
--- a/sysdeps/unix/sysv/linux/m68k/m68k-vdso.h
+++ /dev/null
@@ -1,60 +0,0 @@
-/* Resolve function pointers to VDSO functions.
- Copyright (C) 2010-2019 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- 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/>. */
-
-
-#ifndef _M68K_VDSO_H
-#define _M68K_VDSO_H
-
-#ifdef SHARED
-
-# if IS_IN (rtld)
-# define M68K_VDSO_SYMBOL(name) __rtld_##name
-# define STR_M68K_VDSO_SYMBOL(name) "__rtld_" #name
-# else
-# define M68K_VDSO_SYMBOL(name) name
-# define STR_M68K_VDSO_SYMBOL(name) #name
-# endif
-
-# ifndef __ASSEMBLER__
-
-/* We define __rtld_* copies for rtld.
- We need them visible in libc to initialize. */
-# if IS_IN (rtld) || IS_IN (libc)
-extern void *__rtld___vdso_read_tp;
-extern void *__rtld___vdso_atomic_cmpxchg_32;
-extern void *__rtld___vdso_atomic_barrier;
-
-/* These stubs are meant to be invoked only from the assembly. */
-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 */