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Diffstat (limited to 'libc/sysdeps/linux/sparc/bits/atomic.h')
| -rw-r--r-- | libc/sysdeps/linux/sparc/bits/atomic.h | 329 |
1 files changed, 329 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/sparc/bits/atomic.h b/libc/sysdeps/linux/sparc/bits/atomic.h new file mode 100644 index 000000000..f625eb92a --- /dev/null +++ b/libc/sysdeps/linux/sparc/bits/atomic.h @@ -0,0 +1,329 @@ +/* Atomic operations. sparc32 version. + Copyright (C) 2003, 2004, 2006 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Jakub Jelinek <jakub@redhat.com>, 2003. + + 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. */ + +#ifndef _BITS_ATOMIC_H +#define _BITS_ATOMIC_H 1 + +#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; + + +/* We have no compare and swap, just test and set. + The following implementation contends on 64 global locks + per library and assumes no variable will be accessed using atomic.h + macros from two different libraries. */ + +__make_section_unallocated + (".gnu.linkonce.b.__sparc32_atomic_locks, \"aw\", %nobits"); + +volatile unsigned char __sparc32_atomic_locks[64] + __attribute__ ((nocommon, section (".gnu.linkonce.b.__sparc32_atomic_locks" + __sec_comment), + visibility ("hidden"))); + +#define __sparc32_atomic_do_lock(addr) \ + do \ + { \ + unsigned int __old_lock; \ + unsigned int __idx = (((long) addr >> 2) ^ ((long) addr >> 12)) \ + & 63; \ + do \ + __asm __volatile ("ldstub %1, %0" \ + : "=r" (__old_lock), \ + "=m" (__sparc32_atomic_locks[__idx]) \ + : "m" (__sparc32_atomic_locks[__idx]) \ + : "memory"); \ + while (__old_lock); \ + } \ + while (0) + +#define __sparc32_atomic_do_unlock(addr) \ + do \ + { \ + __sparc32_atomic_locks[(((long) addr >> 2) \ + ^ ((long) addr >> 12)) & 63] = 0; \ + __asm __volatile ("" ::: "memory"); \ + } \ + while (0) + +#define __sparc32_atomic_do_lock24(addr) \ + do \ + { \ + unsigned int __old_lock; \ + do \ + __asm __volatile ("ldstub %1, %0" \ + : "=r" (__old_lock), "=m" (*(addr)) \ + : "m" (*(addr)) \ + : "memory"); \ + while (__old_lock); \ + } \ + while (0) + +#define __sparc32_atomic_do_unlock24(addr) \ + do \ + { \ + *(char *) (addr) = 0; \ + __asm __volatile ("" ::: "memory"); \ + } \ + while (0) + + +#ifndef SHARED +# define __v9_compare_and_exchange_val_32_acq(mem, newval, oldval) \ +({ \ + register __typeof (*(mem)) __acev_tmp __asm ("%g6"); \ + register __typeof (mem) __acev_mem __asm ("%g1") = (mem); \ + register __typeof (*(mem)) __acev_oldval __asm ("%g5"); \ + __acev_tmp = (newval); \ + __acev_oldval = (oldval); \ + /* .word 0xcde05005 is cas [%g1], %g5, %g6. Can't use cas here though, \ + because as will then mark the object file as V8+ arch. */ \ + __asm __volatile (".word 0xcde05005" \ + : "+r" (__acev_tmp), "=m" (*__acev_mem) \ + : "r" (__acev_oldval), "m" (*__acev_mem), \ + "r" (__acev_mem) : "memory"); \ + __acev_tmp; }) +#endif + +/* The only basic operation needed is compare and exchange. */ +#define __v7_compare_and_exchange_val_acq(mem, newval, oldval) \ + ({ __typeof (mem) __acev_memp = (mem); \ + __typeof (*mem) __acev_ret; \ + __typeof (*mem) __acev_newval = (newval); \ + \ + __sparc32_atomic_do_lock (__acev_memp); \ + __acev_ret = *__acev_memp; \ + if (__acev_ret == (oldval)) \ + *__acev_memp = __acev_newval; \ + __sparc32_atomic_do_unlock (__acev_memp); \ + __acev_ret; }) + +#define __v7_compare_and_exchange_bool_acq(mem, newval, oldval) \ + ({ __typeof (mem) __aceb_memp = (mem); \ + int __aceb_ret; \ + __typeof (*mem) __aceb_newval = (newval); \ + \ + __sparc32_atomic_do_lock (__aceb_memp); \ + __aceb_ret = 0; \ + if (*__aceb_memp == (oldval)) \ + *__aceb_memp = __aceb_newval; \ + else \ + __aceb_ret = 1; \ + __sparc32_atomic_do_unlock (__aceb_memp); \ + __aceb_ret; }) + +#define __v7_exchange_acq(mem, newval) \ + ({ __typeof (mem) __acev_memp = (mem); \ + __typeof (*mem) __acev_ret; \ + __typeof (*mem) __acev_newval = (newval); \ + \ + __sparc32_atomic_do_lock (__acev_memp); \ + __acev_ret = *__acev_memp; \ + *__acev_memp = __acev_newval; \ + __sparc32_atomic_do_unlock (__acev_memp); \ + __acev_ret; }) + +#define __v7_exchange_and_add(mem, value) \ + ({ __typeof (mem) __acev_memp = (mem); \ + __typeof (*mem) __acev_ret; \ + \ + __sparc32_atomic_do_lock (__acev_memp); \ + __acev_ret = *__acev_memp; \ + *__acev_memp = __acev_ret + (value); \ + __sparc32_atomic_do_unlock (__acev_memp); \ + __acev_ret; }) + +/* Special versions, which guarantee that top 8 bits of all values + are cleared and use those bits as the ldstub lock. */ +#define __v7_compare_and_exchange_val_24_acq(mem, newval, oldval) \ + ({ __typeof (mem) __acev_memp = (mem); \ + __typeof (*mem) __acev_ret; \ + __typeof (*mem) __acev_newval = (newval); \ + \ + __sparc32_atomic_do_lock24 (__acev_memp); \ + __acev_ret = *__acev_memp & 0xffffff; \ + if (__acev_ret == (oldval)) \ + *__acev_memp = __acev_newval; \ + else \ + __sparc32_atomic_do_unlock24 (__acev_memp); \ + __asm __volatile ("" ::: "memory"); \ + __acev_ret; }) + +#define __v7_exchange_24_rel(mem, newval) \ + ({ __typeof (mem) __acev_memp = (mem); \ + __typeof (*mem) __acev_ret; \ + __typeof (*mem) __acev_newval = (newval); \ + \ + __sparc32_atomic_do_lock24 (__acev_memp); \ + __acev_ret = *__acev_memp & 0xffffff; \ + *__acev_memp = __acev_newval; \ + __asm __volatile ("" ::: "memory"); \ + __acev_ret; }) + +#ifdef SHARED + +/* When dynamically linked, we assume pre-v9 libraries are only ever + used on pre-v9 CPU. */ +# define __atomic_is_v9 0 + +# define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \ + __v7_compare_and_exchange_val_acq (mem, newval, oldval) + +# define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \ + __v7_compare_and_exchange_bool_acq (mem, newval, oldval) + +# define atomic_exchange_acq(mem, newval) \ + __v7_exchange_acq (mem, newval) + +# define atomic_exchange_and_add(mem, value) \ + __v7_exchange_and_add (mem, value) + +# define atomic_compare_and_exchange_val_24_acq(mem, newval, oldval) \ + ({ \ + if (sizeof (*mem) != 4) \ + abort (); \ + __v7_compare_and_exchange_val_24_acq (mem, newval, oldval); }) + +# define atomic_exchange_24_rel(mem, newval) \ + ({ \ + if (sizeof (*mem) != 4) \ + abort (); \ + __v7_exchange_24_rel (mem, newval); }) + +#else + + + +/* + Here's what we'd like to do: + + In libc.a/libpthread.a etc. we don't know if we'll be run on + pre-v9 or v9 CPU. To be interoperable with dynamically linked + apps on v9 CPUs e.g. with process shared primitives, use cas insn + on v9 CPUs and ldstub on pre-v9. + + However, we have no good way to test at run time that I know of, + so resort to the lowest common denominator (v7 ops) -austinf + */ +#define __atomic_is_v9 0 + +# define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \ + ({ \ + __typeof (*mem) __acev_wret; \ + if (sizeof (*mem) != 4) \ + abort (); \ + if (__atomic_is_v9) \ + __acev_wret \ + = __v9_compare_and_exchange_val_32_acq (mem, newval, oldval);\ + else \ + __acev_wret \ + = __v7_compare_and_exchange_val_acq (mem, newval, oldval); \ + __acev_wret; }) + +# define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \ + ({ \ + int __acev_wret; \ + if (sizeof (*mem) != 4) \ + abort (); \ + if (__atomic_is_v9) \ + { \ + __typeof (oldval) __acev_woldval = (oldval); \ + __acev_wret \ + = __v9_compare_and_exchange_val_32_acq (mem, newval, \ + __acev_woldval) \ + != __acev_woldval; \ + } \ + else \ + __acev_wret \ + = __v7_compare_and_exchange_bool_acq (mem, newval, oldval); \ + __acev_wret; }) + +# define atomic_exchange_rel(mem, newval) \ + ({ \ + __typeof (*mem) __acev_wret; \ + if (sizeof (*mem) != 4) \ + abort (); \ + if (__atomic_is_v9) \ + { \ + __typeof (mem) __acev_wmemp = (mem); \ + __typeof (*(mem)) __acev_wval = (newval); \ + do \ + __acev_wret = *__acev_wmemp; \ + while (__builtin_expect \ + (__v9_compare_and_exchange_val_32_acq (__acev_wmemp,\ + __acev_wval, \ + __acev_wret) \ + != __acev_wret, 0)); \ + } \ + else \ + __acev_wret = __v7_exchange_acq (mem, newval); \ + __acev_wret; }) + +# define atomic_compare_and_exchange_val_24_acq(mem, newval, oldval) \ + ({ \ + __typeof (*mem) __acev_wret; \ + if (sizeof (*mem) != 4) \ + abort (); \ + if (__atomic_is_v9) \ + __acev_wret \ + = __v9_compare_and_exchange_val_32_acq (mem, newval, oldval);\ + else \ + __acev_wret \ + = __v7_compare_and_exchange_val_24_acq (mem, newval, oldval);\ + __acev_wret; }) + +# define atomic_exchange_24_rel(mem, newval) \ + ({ \ + __typeof (*mem) __acev_w24ret; \ + if (sizeof (*mem) != 4) \ + abort (); \ + if (__atomic_is_v9) \ + __acev_w24ret = atomic_exchange_rel (mem, newval); \ + else \ + __acev_w24ret = __v7_exchange_24_rel (mem, newval); \ + __acev_w24ret; }) + +#endif + +#endif /* bits/atomic.h */ |