diff options
Diffstat (limited to 'libc/sysdeps/linux/alpha')
| -rw-r--r-- | libc/sysdeps/linux/alpha/bits/atomic.h | 369 |
1 files changed, 369 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/alpha/bits/atomic.h b/libc/sysdeps/linux/alpha/bits/atomic.h new file mode 100644 index 000000000..36a740c75 --- /dev/null +++ b/libc/sysdeps/linux/alpha/bits/atomic.h @@ -0,0 +1,369 @@ +/* Copyright (C) 2003 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#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 int16_t atomic16_t; +typedef uint16_t uatomic16_t; +typedef int_fast16_t atomic_fast16_t; +typedef uint_fast16_t uatomic_fast16_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 int64_t atomic64_t; +typedef uint64_t uatomic64_t; +typedef int_fast64_t atomic_fast64_t; +typedef uint_fast64_t uatomic_fast64_t; + +typedef intptr_t atomicptr_t; +typedef uintptr_t uatomicptr_t; +typedef intmax_t atomic_max_t; +typedef uintmax_t uatomic_max_t; + + +#ifdef UP +# define __MB /* nothing */ +#else +# define __MB " mb\n" +#endif + + +/* Compare and exchange. For all of the "xxx" routines, we expect a + "__prev" and a "__cmp" variable to be provided by the enclosing scope, + in which values are returned. */ + +#define __arch_compare_and_exchange_xxx_8_int(mem, new, old, mb1, mb2) \ +({ \ + unsigned long __tmp, __snew, __addr64; \ + __asm__ __volatile__ ( \ + mb1 \ + " andnot %[__addr8],7,%[__addr64]\n" \ + " insbl %[__new],%[__addr8],%[__snew]\n" \ + "1: ldq_l %[__tmp],0(%[__addr64])\n" \ + " extbl %[__tmp],%[__addr8],%[__prev]\n" \ + " cmpeq %[__prev],%[__old],%[__cmp]\n" \ + " beq %[__cmp],2f\n" \ + " mskbl %[__tmp],%[__addr8],%[__tmp]\n" \ + " or %[__snew],%[__tmp],%[__tmp]\n" \ + " stq_c %[__tmp],0(%[__addr64])\n" \ + " beq %[__tmp],1b\n" \ + mb2 \ + "2:" \ + : [__prev] "=&r" (__prev), \ + [__snew] "=&r" (__snew), \ + [__tmp] "=&r" (__tmp), \ + [__cmp] "=&r" (__cmp), \ + [__addr64] "=&r" (__addr64) \ + : [__addr8] "r" (mem), \ + [__old] "Ir" ((uint64_t)(uint8_t)(uint64_t)(old)), \ + [__new] "r" (new) \ + : "memory"); \ +}) + +#define __arch_compare_and_exchange_xxx_16_int(mem, new, old, mb1, mb2) \ +({ \ + unsigned long __tmp, __snew, __addr64; \ + __asm__ __volatile__ ( \ + mb1 \ + " andnot %[__addr16],7,%[__addr64]\n" \ + " inswl %[__new],%[__addr16],%[__snew]\n" \ + "1: ldq_l %[__tmp],0(%[__addr64])\n" \ + " extwl %[__tmp],%[__addr16],%[__prev]\n" \ + " cmpeq %[__prev],%[__old],%[__cmp]\n" \ + " beq %[__cmp],2f\n" \ + " mskwl %[__tmp],%[__addr16],%[__tmp]\n" \ + " or %[__snew],%[__tmp],%[__tmp]\n" \ + " stq_c %[__tmp],0(%[__addr64])\n" \ + " beq %[__tmp],1b\n" \ + mb2 \ + "2:" \ + : [__prev] "=&r" (__prev), \ + [__snew] "=&r" (__snew), \ + [__tmp] "=&r" (__tmp), \ + [__cmp] "=&r" (__cmp), \ + [__addr64] "=&r" (__addr64) \ + : [__addr16] "r" (mem), \ + [__old] "Ir" ((uint64_t)(uint16_t)(uint64_t)(old)), \ + [__new] "r" (new) \ + : "memory"); \ +}) + +#define __arch_compare_and_exchange_xxx_32_int(mem, new, old, mb1, mb2) \ +({ \ + __asm__ __volatile__ ( \ + mb1 \ + "1: ldl_l %[__prev],%[__mem]\n" \ + " cmpeq %[__prev],%[__old],%[__cmp]\n" \ + " beq %[__cmp],2f\n" \ + " mov %[__new],%[__cmp]\n" \ + " stl_c %[__cmp],%[__mem]\n" \ + " beq %[__cmp],1b\n" \ + mb2 \ + "2:" \ + : [__prev] "=&r" (__prev), \ + [__cmp] "=&r" (__cmp) \ + : [__mem] "m" (*(mem)), \ + [__old] "Ir" ((uint64_t)(atomic32_t)(uint64_t)(old)), \ + [__new] "Ir" (new) \ + : "memory"); \ +}) + +#define __arch_compare_and_exchange_xxx_64_int(mem, new, old, mb1, mb2) \ +({ \ + __asm__ __volatile__ ( \ + mb1 \ + "1: ldq_l %[__prev],%[__mem]\n" \ + " cmpeq %[__prev],%[__old],%[__cmp]\n" \ + " beq %[__cmp],2f\n" \ + " mov %[__new],%[__cmp]\n" \ + " stq_c %[__cmp],%[__mem]\n" \ + " beq %[__cmp],1b\n" \ + mb2 \ + "2:" \ + : [__prev] "=&r" (__prev), \ + [__cmp] "=&r" (__cmp) \ + : [__mem] "m" (*(mem)), \ + [__old] "Ir" ((uint64_t)(old)), \ + [__new] "Ir" (new) \ + : "memory"); \ +}) + +/* For all "bool" routines, we return FALSE if exchange succesful. */ + +#define __arch_compare_and_exchange_bool_8_int(mem, new, old, mb1, mb2) \ +({ unsigned long __prev; int __cmp; \ + __arch_compare_and_exchange_xxx_8_int(mem, new, old, mb1, mb2); \ + !__cmp; }) + +#define __arch_compare_and_exchange_bool_16_int(mem, new, old, mb1, mb2) \ +({ unsigned long __prev; int __cmp; \ + __arch_compare_and_exchange_xxx_16_int(mem, new, old, mb1, mb2); \ + !__cmp; }) + +#define __arch_compare_and_exchange_bool_32_int(mem, new, old, mb1, mb2) \ +({ unsigned long __prev; int __cmp; \ + __arch_compare_and_exchange_xxx_32_int(mem, new, old, mb1, mb2); \ + !__cmp; }) + +#define __arch_compare_and_exchange_bool_64_int(mem, new, old, mb1, mb2) \ +({ unsigned long __prev; int __cmp; \ + __arch_compare_and_exchange_xxx_64_int(mem, new, old, mb1, mb2); \ + !__cmp; }) + +/* For all "val" routines, return the old value whether exchange + successful or not. */ + +#define __arch_compare_and_exchange_val_8_int(mem, new, old, mb1, mb2) \ +({ unsigned long __prev; int __cmp; \ + __arch_compare_and_exchange_xxx_8_int(mem, new, old, mb1, mb2); \ + (typeof (*mem))__prev; }) + +#define __arch_compare_and_exchange_val_16_int(mem, new, old, mb1, mb2) \ +({ unsigned long __prev; int __cmp; \ + __arch_compare_and_exchange_xxx_16_int(mem, new, old, mb1, mb2); \ + (typeof (*mem))__prev; }) + +#define __arch_compare_and_exchange_val_32_int(mem, new, old, mb1, mb2) \ +({ unsigned long __prev; int __cmp; \ + __arch_compare_and_exchange_xxx_32_int(mem, new, old, mb1, mb2); \ + (typeof (*mem))__prev; }) + +#define __arch_compare_and_exchange_val_64_int(mem, new, old, mb1, mb2) \ +({ unsigned long __prev; int __cmp; \ + __arch_compare_and_exchange_xxx_64_int(mem, new, old, mb1, mb2); \ + (typeof (*mem))__prev; }) + +/* Compare and exchange with "acquire" semantics, ie barrier after. */ + +#define atomic_compare_and_exchange_bool_acq(mem, new, old) \ + __atomic_bool_bysize (__arch_compare_and_exchange_bool, int, \ + mem, new, old, "", __MB) + +#define atomic_compare_and_exchange_val_acq(mem, new, old) \ + __atomic_val_bysize (__arch_compare_and_exchange_val, int, \ + mem, new, old, "", __MB) + +/* Compare and exchange with "release" semantics, ie barrier before. */ + +#define atomic_compare_and_exchange_bool_rel(mem, new, old) \ + __atomic_bool_bysize (__arch_compare_and_exchange_bool, int, \ + mem, new, old, __MB, "") + +#define atomic_compare_and_exchange_val_rel(mem, new, old) \ + __atomic_val_bysize (__arch_compare_and_exchange_val, int, \ + mem, new, old, __MB, "") + + +/* Atomically store value and return the previous value. */ + +#define __arch_exchange_8_int(mem, value, mb1, mb2) \ +({ \ + unsigned long __ret, __tmp, __addr64, __sval; \ + __asm__ __volatile__ ( \ + mb1 \ + " andnot %[__addr8],7,%[__addr64]\n" \ + " insbl %[__value],%[__addr8],%[__sval]\n" \ + "1: ldq_l %[__tmp],0(%[__addr64])\n" \ + " extbl %[__tmp],%[__addr8],%[__ret]\n" \ + " mskbl %[__tmp],%[__addr8],%[__tmp]\n" \ + " or %[__sval],%[__tmp],%[__tmp]\n" \ + " stq_c %[__tmp],0(%[__addr64])\n" \ + " beq %[__tmp],1b\n" \ + mb2 \ + : [__ret] "=&r" (__ret), \ + [__sval] "=&r" (__sval), \ + [__tmp] "=&r" (__tmp), \ + [__addr64] "=&r" (__addr64) \ + : [__addr8] "r" (mem), \ + [__value] "r" (value) \ + : "memory"); \ + __ret; }) + +#define __arch_exchange_16_int(mem, value, mb1, mb2) \ +({ \ + unsigned long __ret, __tmp, __addr64, __sval; \ + __asm__ __volatile__ ( \ + mb1 \ + " andnot %[__addr16],7,%[__addr64]\n" \ + " inswl %[__value],%[__addr16],%[__sval]\n" \ + "1: ldq_l %[__tmp],0(%[__addr64])\n" \ + " extwl %[__tmp],%[__addr16],%[__ret]\n" \ + " mskwl %[__tmp],%[__addr16],%[__tmp]\n" \ + " or %[__sval],%[__tmp],%[__tmp]\n" \ + " stq_c %[__tmp],0(%[__addr64])\n" \ + " beq %[__tmp],1b\n" \ + mb2 \ + : [__ret] "=&r" (__ret), \ + [__sval] "=&r" (__sval), \ + [__tmp] "=&r" (__tmp), \ + [__addr64] "=&r" (__addr64) \ + : [__addr16] "r" (mem), \ + [__value] "r" (value) \ + : "memory"); \ + __ret; }) + +#define __arch_exchange_32_int(mem, value, mb1, mb2) \ +({ \ + signed int __ret, __tmp; \ + __asm__ __volatile__ ( \ + mb1 \ + "1: ldl_l %[__ret],%[__mem]\n" \ + " mov %[__val],%[__tmp]\n" \ + " stl_c %[__tmp],%[__mem]\n" \ + " beq %[__tmp],1b\n" \ + mb2 \ + : [__ret] "=&r" (__ret), \ + [__tmp] "=&r" (__tmp) \ + : [__mem] "m" (*(mem)), \ + [__val] "Ir" (value) \ + : "memory"); \ + __ret; }) + +#define __arch_exchange_64_int(mem, value, mb1, mb2) \ +({ \ + unsigned long __ret, __tmp; \ + __asm__ __volatile__ ( \ + mb1 \ + "1: ldq_l %[__ret],%[__mem]\n" \ + " mov %[__val],%[__tmp]\n" \ + " stq_c %[__tmp],%[__mem]\n" \ + " beq %[__tmp],1b\n" \ + mb2 \ + : [__ret] "=&r" (__ret), \ + [__tmp] "=&r" (__tmp) \ + : [__mem] "m" (*(mem)), \ + [__val] "Ir" (value) \ + : "memory"); \ + __ret; }) + +#define atomic_exchange_acq(mem, value) \ + __atomic_val_bysize (__arch_exchange, int, mem, value, "", __MB) + +#define atomic_exchange_rel(mem, value) \ + __atomic_val_bysize (__arch_exchange, int, mem, value, __MB, "") + + +/* Atomically add value and return the previous (unincremented) value. */ + +#define __arch_exchange_and_add_8_int(mem, value, mb1, mb2) \ + ({ __builtin_trap (); 0; }) + +#define __arch_exchange_and_add_16_int(mem, value, mb1, mb2) \ + ({ __builtin_trap (); 0; }) + +#define __arch_exchange_and_add_32_int(mem, value, mb1, mb2) \ +({ \ + signed int __ret, __tmp; \ + __asm__ __volatile__ ( \ + mb1 \ + "1: ldl_l %[__ret],%[__mem]\n" \ + " addl %[__ret],%[__val],%[__tmp]\n" \ + " stl_c %[__tmp],%[__mem]\n" \ + " beq %[__tmp],1b\n" \ + mb2 \ + : [__ret] "=&r" (__ret), \ + [__tmp] "=&r" (__tmp) \ + : [__mem] "m" (*(mem)), \ + [__val] "Ir" ((signed int)(value)) \ + : "memory"); \ + __ret; }) + +#define __arch_exchange_and_add_64_int(mem, value, mb1, mb2) \ +({ \ + unsigned long __ret, __tmp; \ + __asm__ __volatile__ ( \ + mb1 \ + "1: ldq_l %[__ret],%[__mem]\n" \ + " addq %[__ret],%[__val],%[__tmp]\n" \ + " stq_c %[__tmp],%[__mem]\n" \ + " beq %[__tmp],1b\n" \ + mb2 \ + : [__ret] "=&r" (__ret), \ + [__tmp] "=&r" (__tmp) \ + : [__mem] "m" (*(mem)), \ + [__val] "Ir" ((unsigned long)(value)) \ + : "memory"); \ + __ret; }) + +/* ??? Barrier semantics for atomic_exchange_and_add appear to be + undefined. Use full barrier for now, as that's safe. */ +#define atomic_exchange_and_add(mem, value) \ + __atomic_val_bysize (__arch_exchange_and_add, int, mem, value, __MB, __MB) + + +/* ??? Blah, I'm lazy. Implement these later. Can do better than the + compare-and-exchange loop provided by generic code. + +#define atomic_decrement_if_positive(mem) +#define atomic_bit_test_set(mem, bit) + +*/ + +#ifndef UP +# define atomic_full_barrier() __asm ("mb" : : : "memory"); +# define atomic_read_barrier() __asm ("mb" : : : "memory"); +# define atomic_write_barrier() __asm ("wmb" : : : "memory"); +#endif |