diff options
Diffstat (limited to 'ports')
| -rw-r--r-- | ports/ChangeLog.mips | 17 | ||||
| -rw-r--r-- | ports/sysdeps/mips/bits/atomic.h | 211 |
2 files changed, 185 insertions, 43 deletions
diff --git a/ports/ChangeLog.mips b/ports/ChangeLog.mips index de39d53937..af8884b9c3 100644 --- a/ports/ChangeLog.mips +++ b/ports/ChangeLog.mips @@ -1,3 +1,20 @@ +2012-07-11 Tom de Vries <vries@codesourcery.com> + Maxim Kuvyrkov <maxim@codesourcery.com> + + * sysdeps/mips/bits/atomic.h [__GNUC_PREREQ (4, 8)] + (__arch_compare_and_exchange_bool_32_int) + (__arch_compare_and_exchange_val_32_int) + (__arch_compare_and_exchange_bool_64_int) + (__arch_compare_and_exchange_val_64_int) + Define in terms of __atomic_compare_exchange_n. + [__GNUC_PREREQ (4, 8)] + (__arch_exchange_32_int, __arch_exchange_64_int): + Define in terms of __atomic_exchange_n. + [__GNUC_PREREQ (4, 8)] + (__arch_exchange_and_add_32_int, __arch_exchange_and_add_64_int): + Define in terms of __atomic_fetch_add. + [!__GNUC_PREREQ (4, 8)]: Update formatting. + 2012-07-06 Petar Jovanovic <petar.jovanovic@rt-rk.com> * sysdeps/mips/dl-machine.h (RTLD_START): Do not store data below diff --git a/ports/sysdeps/mips/bits/atomic.h b/ports/sysdeps/mips/bits/atomic.h index 4d51d7fa2f..b0942737dd 100644 --- a/ports/sysdeps/mips/bits/atomic.h +++ b/ports/sysdeps/mips/bits/atomic.h @@ -1,5 +1,5 @@ /* Low-level functions for atomic operations. Mips version. - Copyright (C) 2005 Free Software Foundation, Inc. + Copyright (C) 2005-2012 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 @@ -78,17 +78,141 @@ typedef uintmax_t uatomic_max_t; #define MIPS_SYNC_STR_1(X) MIPS_SYNC_STR_2(X) #define MIPS_SYNC_STR MIPS_SYNC_STR_1(MIPS_SYNC) +#if __GNUC_PREREQ (4, 8) +/* The __atomic_* builtins are available in GCC 4.7 and later, but MIPS + support for their efficient implementation was added only in GCC 4.8. */ + +/* Compare and exchange. + For all "bool" routines, we return FALSE if exchange succesful. */ + +# define __arch_compare_and_exchange_bool_8_int(mem, newval, oldval, model) \ + (abort (), 0) + +# define __arch_compare_and_exchange_bool_16_int(mem, newval, oldval, model) \ + (abort (), 0) + +# define __arch_compare_and_exchange_bool_32_int(mem, newval, oldval, model) \ + ({ \ + typeof (*mem) __oldval = (oldval); \ + !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \ + model, __ATOMIC_RELAXED); \ + }) + +# define __arch_compare_and_exchange_val_8_int(mem, newval, oldval, model) \ + (abort (), (typeof(*mem)) 0) + +# define __arch_compare_and_exchange_val_16_int(mem, newval, oldval, model) \ + (abort (), (typeof(*mem)) 0) + +# define __arch_compare_and_exchange_val_32_int(mem, newval, oldval, model) \ + ({ \ + typeof (*mem) __oldval = (oldval); \ + __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \ + model, __ATOMIC_RELAXED); \ + __oldval; \ + }) + +# if _MIPS_SIM == _ABIO32 + /* We can't do an atomic 64-bit operation in O32. */ +# define __arch_compare_and_exchange_bool_64_int(mem, newval, oldval, model) \ + (abort (), 0) +# define __arch_compare_and_exchange_val_64_int(mem, newval, oldval, model) \ + (abort (), (typeof(*mem)) 0) +# else +# define __arch_compare_and_exchange_bool_64_int(mem, newval, oldval, model) \ + __arch_compare_and_exchange_bool_32_int (mem, newval, oldval, model) +# define __arch_compare_and_exchange_val_64_int(mem, newval, oldval, model) \ + __arch_compare_and_exchange_val_32_int (mem, newval, oldval, model) +# endif + +/* 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, __ATOMIC_ACQUIRE) + +# define atomic_compare_and_exchange_val_acq(mem, new, old) \ + __atomic_val_bysize (__arch_compare_and_exchange_val, int, \ + mem, new, old, __ATOMIC_ACQUIRE) + +/* 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, __ATOMIC_RELEASE) + +# define atomic_compare_and_exchange_val_rel(mem, new, old) \ + __atomic_val_bysize (__arch_compare_and_exchange_val, int, \ + mem, new, old, __ATOMIC_RELEASE) + + +/* Atomic exchange (without compare). */ + +# define __arch_exchange_8_int(mem, newval, model) \ + (abort (), (typeof(*mem)) 0) + +# define __arch_exchange_16_int(mem, newval, model) \ + (abort (), (typeof(*mem)) 0) + +# define __arch_exchange_32_int(mem, newval, model) \ + __atomic_exchange_n (mem, newval, model) + +# if _MIPS_SIM == _ABIO32 +/* We can't do an atomic 64-bit operation in O32. */ +# define __arch_exchange_64_int(mem, newval, model) \ + (abort (), (typeof(*mem)) 0) +# else +# define __arch_exchange_64_int(mem, newval, model) \ + __atomic_exchange_n (mem, newval, model) +# endif + +# define atomic_exchange_acq(mem, value) \ + __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_ACQUIRE) + +# define atomic_exchange_rel(mem, value) \ + __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_RELEASE) + + +/* Atomically add value and return the previous (unincremented) value. */ + +# define __arch_exchange_and_add_8_int(mem, value, model) \ + (abort (), (typeof(*mem)) 0) + +# define __arch_exchange_and_add_16_int(mem, value, model) \ + (abort (), (typeof(*mem)) 0) + +# define __arch_exchange_and_add_32_int(mem, value, model) \ + __atomic_fetch_add (mem, value, model) + +# if _MIPS_SIM == _ABIO32 +/* We can't do an atomic 64-bit operation in O32. */ +# define __arch_exchange_and_add_64_int(mem, value, model) \ + (abort (), (typeof(*mem)) 0) +# else +# define __arch_exchange_and_add_64_int(mem, value, model) \ + __atomic_fetch_add (mem, value, model) +# endif + +/* ??? 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, \ + __ATOMIC_ACQ_REL) +#else /* !__GNUC_PREREQ (4, 8) */ +/* This implementation using inline assembly will be removed once glibc + requires GCC 4.8 or later to build. */ + /* 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, newval, oldval, rel, acq) \ +# define __arch_compare_and_exchange_xxx_8_int(mem, newval, oldval, rel, acq) \ (abort (), __prev = __cmp = 0) -#define __arch_compare_and_exchange_xxx_16_int(mem, newval, oldval, rel, acq) \ +# define __arch_compare_and_exchange_xxx_16_int(mem, newval, oldval, rel, acq) \ (abort (), __prev = __cmp = 0) -#define __arch_compare_and_exchange_xxx_32_int(mem, newval, oldval, rel, acq) \ +# define __arch_compare_and_exchange_xxx_32_int(mem, newval, oldval, rel, acq) \ __asm__ __volatile__ ( \ ".set push\n\t" \ MIPS_PUSH_MIPS2 \ @@ -107,12 +231,12 @@ typedef uintmax_t uatomic_max_t; : "r" (oldval), "r" (newval), "m" (*mem) \ : "memory") -#if _MIPS_SIM == _ABIO32 +# if _MIPS_SIM == _ABIO32 /* We can't do an atomic 64-bit operation in O32. */ -#define __arch_compare_and_exchange_xxx_64_int(mem, newval, oldval, rel, acq) \ +# define __arch_compare_and_exchange_xxx_64_int(mem, newval, oldval, rel, acq) \ (abort (), __prev = __cmp = 0) -#else -#define __arch_compare_and_exchange_xxx_64_int(mem, newval, oldval, rel, acq) \ +# else +# define __arch_compare_and_exchange_xxx_64_int(mem, newval, oldval, rel, acq) \ __asm__ __volatile__ ("\n" \ ".set push\n\t" \ MIPS_PUSH_MIPS2 \ @@ -130,26 +254,26 @@ typedef uintmax_t uatomic_max_t; : "=&r" (__prev), "=&r" (__cmp), "=m" (*mem) \ : "r" (oldval), "r" (newval), "m" (*mem) \ : "memory") -#endif +# endif /* For all "bool" routines, we return FALSE if exchange succesful. */ -#define __arch_compare_and_exchange_bool_8_int(mem, new, old, rel, acq) \ +# define __arch_compare_and_exchange_bool_8_int(mem, new, old, rel, acq) \ ({ typeof (*mem) __prev; int __cmp; \ __arch_compare_and_exchange_xxx_8_int(mem, new, old, rel, acq); \ !__cmp; }) -#define __arch_compare_and_exchange_bool_16_int(mem, new, old, rel, acq) \ +# define __arch_compare_and_exchange_bool_16_int(mem, new, old, rel, acq) \ ({ typeof (*mem) __prev; int __cmp; \ __arch_compare_and_exchange_xxx_16_int(mem, new, old, rel, acq); \ !__cmp; }) -#define __arch_compare_and_exchange_bool_32_int(mem, new, old, rel, acq) \ +# define __arch_compare_and_exchange_bool_32_int(mem, new, old, rel, acq) \ ({ typeof (*mem) __prev; int __cmp; \ __arch_compare_and_exchange_xxx_32_int(mem, new, old, rel, acq); \ !__cmp; }) -#define __arch_compare_and_exchange_bool_64_int(mem, new, old, rel, acq) \ +# define __arch_compare_and_exchange_bool_64_int(mem, new, old, rel, acq) \ ({ typeof (*mem) __prev; int __cmp; \ __arch_compare_and_exchange_xxx_64_int(mem, new, old, rel, acq); \ !__cmp; }) @@ -157,43 +281,43 @@ typedef uintmax_t uatomic_max_t; /* For all "val" routines, return the old value whether exchange successful or not. */ -#define __arch_compare_and_exchange_val_8_int(mem, new, old, rel, acq) \ +# define __arch_compare_and_exchange_val_8_int(mem, new, old, rel, acq) \ ({ typeof (*mem) __prev; int __cmp; \ __arch_compare_and_exchange_xxx_8_int(mem, new, old, rel, acq); \ (typeof (*mem))__prev; }) -#define __arch_compare_and_exchange_val_16_int(mem, new, old, rel, acq) \ +# define __arch_compare_and_exchange_val_16_int(mem, new, old, rel, acq) \ ({ typeof (*mem) __prev; int __cmp; \ __arch_compare_and_exchange_xxx_16_int(mem, new, old, rel, acq); \ (typeof (*mem))__prev; }) -#define __arch_compare_and_exchange_val_32_int(mem, new, old, rel, acq) \ +# define __arch_compare_and_exchange_val_32_int(mem, new, old, rel, acq) \ ({ typeof (*mem) __prev; int __cmp; \ __arch_compare_and_exchange_xxx_32_int(mem, new, old, rel, acq); \ (typeof (*mem))__prev; }) -#define __arch_compare_and_exchange_val_64_int(mem, new, old, rel, acq) \ +# define __arch_compare_and_exchange_val_64_int(mem, new, old, rel, acq) \ ({ typeof (*mem) __prev; int __cmp; \ __arch_compare_and_exchange_xxx_64_int(mem, new, old, rel, acq); \ (typeof (*mem))__prev; }) /* Compare and exchange with "acquire" semantics, ie barrier after. */ -#define atomic_compare_and_exchange_bool_acq(mem, new, old) \ +# define atomic_compare_and_exchange_bool_acq(mem, new, old) \ __atomic_bool_bysize (__arch_compare_and_exchange_bool, int, \ mem, new, old, "", MIPS_SYNC_STR) -#define atomic_compare_and_exchange_val_acq(mem, new, old) \ +# define atomic_compare_and_exchange_val_acq(mem, new, old) \ __atomic_val_bysize (__arch_compare_and_exchange_val, int, \ mem, new, old, "", MIPS_SYNC_STR) /* Compare and exchange with "release" semantics, ie barrier before. */ -#define atomic_compare_and_exchange_bool_rel(mem, new, old) \ +# define atomic_compare_and_exchange_bool_rel(mem, new, old) \ __atomic_bool_bysize (__arch_compare_and_exchange_bool, int, \ mem, new, old, MIPS_SYNC_STR, "") -#define atomic_compare_and_exchange_val_rel(mem, new, old) \ +# define atomic_compare_and_exchange_val_rel(mem, new, old) \ __atomic_val_bysize (__arch_compare_and_exchange_val, int, \ mem, new, old, MIPS_SYNC_STR, "") @@ -201,13 +325,13 @@ typedef uintmax_t uatomic_max_t; /* Atomic exchange (without compare). */ -#define __arch_exchange_xxx_8_int(mem, newval, rel, acq) \ - (abort (), 0) +# define __arch_exchange_xxx_8_int(mem, newval, rel, acq) \ + (abort (), (typeof(*mem)) 0) -#define __arch_exchange_xxx_16_int(mem, newval, rel, acq) \ - (abort (), 0) +# define __arch_exchange_xxx_16_int(mem, newval, rel, acq) \ + (abort (), (typeof(*mem)) 0) -#define __arch_exchange_xxx_32_int(mem, newval, rel, acq) \ +# define __arch_exchange_xxx_32_int(mem, newval, rel, acq) \ ({ typeof (*mem) __prev; int __cmp; \ __asm__ __volatile__ ("\n" \ ".set push\n\t" \ @@ -226,12 +350,12 @@ typedef uintmax_t uatomic_max_t; : "memory"); \ __prev; }) -#if _MIPS_SIM == _ABIO32 +# if _MIPS_SIM == _ABIO32 /* We can't do an atomic 64-bit operation in O32. */ -#define __arch_exchange_xxx_64_int(mem, newval, rel, acq) \ - (abort (), 0) -#else -#define __arch_exchange_xxx_64_int(mem, newval, rel, acq) \ +# define __arch_exchange_xxx_64_int(mem, newval, rel, acq) \ + (abort (), (typeof(*mem)) 0) +# else +# define __arch_exchange_xxx_64_int(mem, newval, rel, acq) \ ({ typeof (*mem) __prev; int __cmp; \ __asm__ __volatile__ ("\n" \ ".set push\n\t" \ @@ -249,24 +373,24 @@ typedef uintmax_t uatomic_max_t; : "r" (newval), "m" (*mem) \ : "memory"); \ __prev; }) -#endif +# endif -#define atomic_exchange_acq(mem, value) \ +# define atomic_exchange_acq(mem, value) \ __atomic_val_bysize (__arch_exchange_xxx, int, mem, value, "", MIPS_SYNC_STR) -#define atomic_exchange_rel(mem, value) \ +# define atomic_exchange_rel(mem, value) \ __atomic_val_bysize (__arch_exchange_xxx, int, mem, value, MIPS_SYNC_STR, "") /* Atomically add value and return the previous (unincremented) value. */ -#define __arch_exchange_and_add_8_int(mem, newval, rel, acq) \ +# define __arch_exchange_and_add_8_int(mem, newval, rel, acq) \ (abort (), (typeof(*mem)) 0) -#define __arch_exchange_and_add_16_int(mem, newval, rel, acq) \ +# define __arch_exchange_and_add_16_int(mem, newval, rel, acq) \ (abort (), (typeof(*mem)) 0) -#define __arch_exchange_and_add_32_int(mem, value, rel, acq) \ +# define __arch_exchange_and_add_32_int(mem, value, rel, acq) \ ({ typeof (*mem) __prev; int __cmp; \ __asm__ __volatile__ ("\n" \ ".set push\n\t" \ @@ -285,12 +409,12 @@ typedef uintmax_t uatomic_max_t; : "memory"); \ __prev; }) -#if _MIPS_SIM == _ABIO32 +# if _MIPS_SIM == _ABIO32 /* We can't do an atomic 64-bit operation in O32. */ -#define __arch_exchange_and_add_64_int(mem, value, rel, acq) \ +# define __arch_exchange_and_add_64_int(mem, value, rel, acq) \ (abort (), (typeof(*mem)) 0) -#else -#define __arch_exchange_and_add_64_int(mem, value, rel, acq) \ +# else +# define __arch_exchange_and_add_64_int(mem, value, rel, acq) \ ({ typeof (*mem) __prev; int __cmp; \ __asm__ __volatile__ ( \ ".set push\n\t" \ @@ -308,13 +432,14 @@ typedef uintmax_t uatomic_max_t; : "r" (value), "m" (*mem) \ : "memory"); \ __prev; }) -#endif +# endif /* ??? 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) \ +# define atomic_exchange_and_add(mem, value) \ __atomic_val_bysize (__arch_exchange_and_add, int, mem, value, \ MIPS_SYNC_STR, MIPS_SYNC_STR) +#endif /* __GNUC_PREREQ (4, 8) */ /* TODO: More atomic operations could be implemented efficiently; only the basic requirements are done. */ |