mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 13:00:06 +00:00
Separate ARM bits/atomic.h into generic and Linux-specific files.
This commit is contained in:
Roland McGrath
parent
5544c7e000
commit
f3bdd5f843
@ -1,3 +1,20 @@
|
||||
2012-08-14 Roland McGrath <roland@hack.frob.com>
|
||||
|
||||
* sysdeps/unix/sysv/linux/arm/nptl/bits/atomic.h
|
||||
[!__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4]
|
||||
(atomic_full_barrier): Renamed to ...
|
||||
(__arm_assisted_full_barrier): ... this.
|
||||
(__arch_compare_and_exchange_val_32_acq): Renamed to ...
|
||||
(__arm_assisted_compare_and_exchange_val_32_acq): ... this.
|
||||
(atomic8_t, uatomic8_t, atomic_fast8_t, uatomic_fast8_t,
|
||||
atomic32_t, uatomic32_t, atomic_fast32_t, uatomic_fast32_t,
|
||||
atomicptr_t, uatomicptr_t, atomic_max_t, uatomic_max_t,
|
||||
atomic_full_barrier, __arch_compare_and_exchange_val_32_acq,
|
||||
__arch_compare_and_exchange_val_8_acq,
|
||||
__arch_compare_and_exchange_val_16_acq,
|
||||
__arch_compare_and_exchange_val_64_acq): Types and macros moved to ...
|
||||
* sysdeps/arm/bits/atomic.h: ... this new file.
|
||||
|
||||
2012-08-12 Mike Frysinger <vapier@gentoo.org>
|
||||
|
||||
* sysdeps/arm/dl-machine.h (elf_machine_rel) [R_ARM_ABS32]: Fix style.
|
||||
|
||||
81
ports/sysdeps/arm/bits/atomic.h
Normal file
81
ports/sysdeps/arm/bits/atomic.h
Normal file
@ -0,0 +1,81 @@
|
||||
/* Atomic operations. Pure ARM version.
|
||||
Copyright (C) 2002-2012 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 <stdint.h>
|
||||
|
||||
typedef int8_t atomic8_t;
|
||||
typedef uint8_t uatomic8_t;
|
||||
typedef int_fast8_t atomic_fast8_t;
|
||||
typedef uint_fast8_t uatomic_fast8_t;
|
||||
|
||||
typedef int32_t atomic32_t;
|
||||
typedef uint32_t uatomic32_t;
|
||||
typedef int_fast32_t atomic_fast32_t;
|
||||
typedef uint_fast32_t uatomic_fast32_t;
|
||||
|
||||
typedef intptr_t atomicptr_t;
|
||||
typedef uintptr_t uatomicptr_t;
|
||||
typedef intmax_t atomic_max_t;
|
||||
typedef uintmax_t uatomic_max_t;
|
||||
|
||||
void __arm_link_error (void);
|
||||
|
||||
/* Use the atomic builtins provided by GCC in case the backend provides
|
||||
a pattern to do this efficiently. */
|
||||
|
||||
#ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
|
||||
# define atomic_full_barrier() __sync_synchronize ()
|
||||
#else
|
||||
# define atomic_full_barrier() __arm_assisted_full_barrier ()
|
||||
#endif
|
||||
|
||||
/* An OS-specific bits/atomic.h file will define this macro if
|
||||
the OS can provide something. If not, we'll fail to build
|
||||
with a compiler that doesn't supply the operation. */
|
||||
#ifndef __arm_assisted_full_barrier
|
||||
# define __arm_assisted_full_barrier() __arm_link_error()
|
||||
#endif
|
||||
|
||||
/* Atomic compare and exchange. */
|
||||
|
||||
#ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
|
||||
# define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
|
||||
__sync_val_compare_and_swap ((mem), (oldval), (newval))
|
||||
#else
|
||||
# define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
|
||||
__arm_assisted_compare_and_exchange_val_32_acq ((mem), (oldval), (newval))
|
||||
#endif
|
||||
|
||||
/* We don't support atomic operations on any non-word types.
|
||||
So make them link errors. */
|
||||
#define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval) \
|
||||
({ __arm_link_error (); oldval; })
|
||||
|
||||
#define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \
|
||||
({ __arm_link_error (); oldval; })
|
||||
|
||||
#define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \
|
||||
({ __arm_link_error (); oldval; })
|
||||
|
||||
/* An OS-specific bits/atomic.h file will define this macro if
|
||||
the OS can provide something. If not, we'll fail to build
|
||||
with a compiler that doesn't supply the operation. */
|
||||
#ifndef __arm_assisted_compare_and_exchange_val_32_acq
|
||||
# define __arm_assisted_compare_and_exchange_val_32_acq(mem, newval, oldval) \
|
||||
({ __arm_link_error (); oldval; })
|
||||
#endif
|
||||
@ -1,4 +1,5 @@
|
||||
/* Copyright (C) 2002-2012 Free Software Foundation, Inc.
|
||||
/* Atomic operations. ARM/Linux version.
|
||||
Copyright (C) 2002-2012 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
|
||||
@ -15,41 +16,17 @@
|
||||
License along with the GNU C Library. If not, see
|
||||
<http://www.gnu.org/licenses/>. */
|
||||
|
||||
#include <stdint.h>
|
||||
#include <sysdep.h>
|
||||
|
||||
|
||||
typedef int8_t atomic8_t;
|
||||
typedef uint8_t uatomic8_t;
|
||||
typedef int_fast8_t atomic_fast8_t;
|
||||
typedef uint_fast8_t uatomic_fast8_t;
|
||||
|
||||
typedef int32_t atomic32_t;
|
||||
typedef uint32_t uatomic32_t;
|
||||
typedef int_fast32_t atomic_fast32_t;
|
||||
typedef uint_fast32_t uatomic_fast32_t;
|
||||
|
||||
typedef intptr_t atomicptr_t;
|
||||
typedef uintptr_t uatomicptr_t;
|
||||
typedef intmax_t atomic_max_t;
|
||||
typedef uintmax_t uatomic_max_t;
|
||||
|
||||
void __arm_link_error (void);
|
||||
|
||||
/* Use the atomic builtins provided by GCC in case the backend provides
|
||||
a pattern to do this efficiently. */
|
||||
|
||||
#ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
|
||||
#define atomic_full_barrier() __sync_synchronize ()
|
||||
#elif defined __thumb2__
|
||||
#define atomic_full_barrier() \
|
||||
/* If the compiler doesn't provide a primitive, we'll use this macro
|
||||
to get assistance from the kernel. */
|
||||
#ifdef __thumb2__
|
||||
# define __arm_assisted_full_barrier() \
|
||||
__asm__ __volatile__ \
|
||||
("movw\tip, #0x0fa0\n\t" \
|
||||
"movt\tip, #0xffff\n\t" \
|
||||
"blx\tip" \
|
||||
: : : "ip", "lr", "cc", "memory");
|
||||
#else
|
||||
#define atomic_full_barrier() \
|
||||
# define __arm_assisted_full_barrier() \
|
||||
__asm__ __volatile__ \
|
||||
("mov\tip, #0xffff0fff\n\t" \
|
||||
"mov\tlr, pc\n\t" \
|
||||
@ -60,19 +37,9 @@ void __arm_link_error (void);
|
||||
/* Atomic compare and exchange. This sequence relies on the kernel to
|
||||
provide a compare and exchange operation which is atomic on the
|
||||
current architecture, either via cleverness on pre-ARMv6 or via
|
||||
ldrex / strex on ARMv6. */
|
||||
ldrex / strex on ARMv6.
|
||||
|
||||
#define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval) \
|
||||
({ __arm_link_error (); oldval; })
|
||||
|
||||
#define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \
|
||||
({ __arm_link_error (); oldval; })
|
||||
|
||||
#ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
|
||||
#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
|
||||
__sync_val_compare_and_swap ((mem), (oldval), (newval))
|
||||
|
||||
/* It doesn't matter what register is used for a_oldval2, but we must
|
||||
It doesn't matter what register is used for a_oldval2, but we must
|
||||
specify one to work around GCC PR rtl-optimization/21223. Otherwise
|
||||
it may cause a_oldval or a_tmp to be moved to a different register.
|
||||
|
||||
@ -81,10 +48,10 @@ void __arm_link_error (void);
|
||||
form *PTR and PTR has a 'volatile ... *' type, then __typeof (*PTR) has
|
||||
a 'volatile ...' type and this triggers -Wvolatile-register-var to
|
||||
complain about 'register volatile ... asm ("reg")'. */
|
||||
#elif defined __thumb2__
|
||||
#ifdef __thumb2__
|
||||
/* Thumb-2 has ldrex/strex. However it does not have barrier instructions,
|
||||
so we still need to use the kernel helper. */
|
||||
#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
|
||||
# define __arm_assisted_compare_and_exchange_val_32_acq(mem, newval, oldval) \
|
||||
({ union { __typeof (oldval) a; uint32_t v; } oldval_arg = { .a = (oldval) };\
|
||||
union { __typeof (newval) a; uint32_t v; } newval_arg = { .a = (newval) };\
|
||||
register uint32_t a_oldval asm ("r0"); \
|
||||
@ -109,7 +76,7 @@ void __arm_link_error (void);
|
||||
: "ip", "lr", "cc", "memory"); \
|
||||
(__typeof (oldval)) a_tmp; })
|
||||
#else
|
||||
#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
|
||||
# define __arm_assisted_compare_and_exchange_val_32_acq(mem, newval, oldval) \
|
||||
({ union { __typeof (oldval) a; uint32_t v; } oldval_arg = { .a = (oldval) };\
|
||||
union { __typeof (newval) a; uint32_t v; } newval_arg = { .a = (newval) };\
|
||||
register uint32_t a_oldval asm ("r0"); \
|
||||
@ -135,5 +102,4 @@ void __arm_link_error (void);
|
||||
(__typeof (oldval)) a_tmp; })
|
||||
#endif
|
||||
|
||||
#define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \
|
||||
({ __arm_link_error (); oldval; })
|
||||
#include <sysdeps/arm/bits/atomic.h>
|
||||
|
||||
Loading…
Reference in New Issue
Block a user