diff options
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/i386/atomic-machine.h | 545 | ||||
| -rw-r--r-- | sysdeps/x86/atomic-machine.h (renamed from sysdeps/x86_64/atomic-machine.h) | 241 |
2 files changed, 165 insertions, 621 deletions
diff --git a/sysdeps/i386/atomic-machine.h b/sysdeps/i386/atomic-machine.h deleted file mode 100644 index 272da5dd8f..0000000000 --- a/sysdeps/i386/atomic-machine.h +++ /dev/null @@ -1,545 +0,0 @@ -/* Copyright (C) 2002-2018 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. - - 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> -#include <tls.h> /* For tcbhead_t. */ - - -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; - - -#ifndef LOCK_PREFIX -# ifdef UP -# define LOCK_PREFIX /* nothing */ -# else -# define LOCK_PREFIX "lock;" -# endif -#endif - -#define __HAVE_64B_ATOMICS 0 -#define USE_ATOMIC_COMPILER_BUILTINS 0 -#define ATOMIC_EXCHANGE_USES_CAS 0 - - -#define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \ - __sync_val_compare_and_swap (mem, oldval, newval) -#define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \ - (! __sync_bool_compare_and_swap (mem, oldval, newval)) - - -#define __arch_c_compare_and_exchange_val_8_acq(mem, newval, oldval) \ - ({ __typeof (*mem) ret; \ - __asm __volatile ("cmpl $0, %%gs:%P5\n\t" \ - "je 0f\n\t" \ - "lock\n" \ - "0:\tcmpxchgb %b2, %1" \ - : "=a" (ret), "=m" (*mem) \ - : "q" (newval), "m" (*mem), "0" (oldval), \ - "i" (offsetof (tcbhead_t, multiple_threads))); \ - ret; }) - -#define __arch_c_compare_and_exchange_val_16_acq(mem, newval, oldval) \ - ({ __typeof (*mem) ret; \ - __asm __volatile ("cmpl $0, %%gs:%P5\n\t" \ - "je 0f\n\t" \ - "lock\n" \ - "0:\tcmpxchgw %w2, %1" \ - : "=a" (ret), "=m" (*mem) \ - : "r" (newval), "m" (*mem), "0" (oldval), \ - "i" (offsetof (tcbhead_t, multiple_threads))); \ - ret; }) - -#define __arch_c_compare_and_exchange_val_32_acq(mem, newval, oldval) \ - ({ __typeof (*mem) ret; \ - __asm __volatile ("cmpl $0, %%gs:%P5\n\t" \ - "je 0f\n\t" \ - "lock\n" \ - "0:\tcmpxchgl %2, %1" \ - : "=a" (ret), "=m" (*mem) \ - : "r" (newval), "m" (*mem), "0" (oldval), \ - "i" (offsetof (tcbhead_t, multiple_threads))); \ - ret; }) - -/* XXX We do not really need 64-bit compare-and-exchange. At least - not in the moment. Using it would mean causing portability - problems since not many other 32-bit architectures have support for - such an operation. So don't define any code for now. If it is - really going to be used the code below can be used on Intel Pentium - and later, but NOT on i486. */ -#if 1 -# define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \ - ({ __typeof (*mem) ret = *(mem); \ - abort (); \ - ret = (newval); \ - ret = (oldval); \ - ret; }) -# define __arch_c_compare_and_exchange_val_64_acq(mem, newval, oldval) \ - ({ __typeof (*mem) ret = *(mem); \ - abort (); \ - ret = (newval); \ - ret = (oldval); \ - ret; }) -#else -# ifdef __PIC__ -# define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \ - ({ __typeof (*mem) ret; \ - __asm __volatile ("xchgl %2, %%ebx\n\t" \ - LOCK_PREFIX "cmpxchg8b %1\n\t" \ - "xchgl %2, %%ebx" \ - : "=A" (ret), "=m" (*mem) \ - : "DS" (((unsigned long long int) (newval)) \ - & 0xffffffff), \ - "c" (((unsigned long long int) (newval)) >> 32), \ - "m" (*mem), "a" (((unsigned long long int) (oldval)) \ - & 0xffffffff), \ - "d" (((unsigned long long int) (oldval)) >> 32)); \ - ret; }) - -# define __arch_c_compare_and_exchange_val_64_acq(mem, newval, oldval) \ - ({ __typeof (*mem) ret; \ - __asm __volatile ("xchgl %2, %%ebx\n\t" \ - "cmpl $0, %%gs:%P7\n\t" \ - "je 0f\n\t" \ - "lock\n" \ - "0:\tcmpxchg8b %1\n\t" \ - "xchgl %2, %%ebx" \ - : "=A" (ret), "=m" (*mem) \ - : "DS" (((unsigned long long int) (newval)) \ - & 0xffffffff), \ - "c" (((unsigned long long int) (newval)) >> 32), \ - "m" (*mem), "a" (((unsigned long long int) (oldval)) \ - & 0xffffffff), \ - "d" (((unsigned long long int) (oldval)) >> 32), \ - "i" (offsetof (tcbhead_t, multiple_threads))); \ - ret; }) -# else -# define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \ - ({ __typeof (*mem) ret; \ - __asm __volatile (LOCK_PREFIX "cmpxchg8b %1" \ - : "=A" (ret), "=m" (*mem) \ - : "b" (((unsigned long long int) (newval)) \ - & 0xffffffff), \ - "c" (((unsigned long long int) (newval)) >> 32), \ - "m" (*mem), "a" (((unsigned long long int) (oldval)) \ - & 0xffffffff), \ - "d" (((unsigned long long int) (oldval)) >> 32)); \ - ret; }) - -# define __arch_c_compare_and_exchange_val_64_acq(mem, newval, oldval) \ - ({ __typeof (*mem) ret; \ - __asm __volatile ("cmpl $0, %%gs:%P7\n\t" \ - "je 0f\n\t" \ - "lock\n" \ - "0:\tcmpxchg8b %1" \ - : "=A" (ret), "=m" (*mem) \ - : "b" (((unsigned long long int) (newval)) \ - & 0xffffffff), \ - "c" (((unsigned long long int) (newval)) >> 32), \ - "m" (*mem), "a" (((unsigned long long int) (oldval)) \ - & 0xffffffff), \ - "d" (((unsigned long long int) (oldval)) >> 32), \ - "i" (offsetof (tcbhead_t, multiple_threads))); \ - ret; }) -# endif -#endif - - -/* Note that we need no lock prefix. */ -#define atomic_exchange_acq(mem, newvalue) \ - ({ __typeof (*mem) result; \ - if (sizeof (*mem) == 1) \ - __asm __volatile ("xchgb %b0, %1" \ - : "=q" (result), "=m" (*mem) \ - : "0" (newvalue), "m" (*mem)); \ - else if (sizeof (*mem) == 2) \ - __asm __volatile ("xchgw %w0, %1" \ - : "=r" (result), "=m" (*mem) \ - : "0" (newvalue), "m" (*mem)); \ - else if (sizeof (*mem) == 4) \ - __asm __volatile ("xchgl %0, %1" \ - : "=r" (result), "=m" (*mem) \ - : "0" (newvalue), "m" (*mem)); \ - else \ - { \ - result = 0; \ - abort (); \ - } \ - result; }) - - -#define __arch_exchange_and_add_body(lock, pfx, mem, value) \ - ({ __typeof (*mem) __result; \ - __typeof (value) __addval = (value); \ - if (sizeof (*mem) == 1) \ - __asm __volatile (lock "xaddb %b0, %1" \ - : "=q" (__result), "=m" (*mem) \ - : "0" (__addval), "m" (*mem), \ - "i" (offsetof (tcbhead_t, multiple_threads))); \ - else if (sizeof (*mem) == 2) \ - __asm __volatile (lock "xaddw %w0, %1" \ - : "=r" (__result), "=m" (*mem) \ - : "0" (__addval), "m" (*mem), \ - "i" (offsetof (tcbhead_t, multiple_threads))); \ - else if (sizeof (*mem) == 4) \ - __asm __volatile (lock "xaddl %0, %1" \ - : "=r" (__result), "=m" (*mem) \ - : "0" (__addval), "m" (*mem), \ - "i" (offsetof (tcbhead_t, multiple_threads))); \ - else \ - { \ - __typeof (mem) __memp = (mem); \ - __typeof (*mem) __tmpval; \ - __result = *__memp; \ - do \ - __tmpval = __result; \ - while ((__result = pfx##_compare_and_exchange_val_64_acq \ - (__memp, __result + __addval, __result)) == __tmpval); \ - } \ - __result; }) - -#define atomic_exchange_and_add(mem, value) \ - __sync_fetch_and_add (mem, value) - -#define __arch_exchange_and_add_cprefix \ - "cmpl $0, %%gs:%P4\n\tje 0f\n\tlock\n0:\t" - -#define catomic_exchange_and_add(mem, value) \ - __arch_exchange_and_add_body (__arch_exchange_and_add_cprefix, __arch_c, \ - mem, value) - - -#define __arch_add_body(lock, pfx, mem, value) \ - do { \ - if (__builtin_constant_p (value) && (value) == 1) \ - atomic_increment (mem); \ - else if (__builtin_constant_p (value) && (value) == -1) \ - atomic_decrement (mem); \ - else if (sizeof (*mem) == 1) \ - __asm __volatile (lock "addb %b1, %0" \ - : "=m" (*mem) \ - : "iq" (value), "m" (*mem), \ - "i" (offsetof (tcbhead_t, multiple_threads))); \ - else if (sizeof (*mem) == 2) \ - __asm __volatile (lock "addw %w1, %0" \ - : "=m" (*mem) \ - : "ir" (value), "m" (*mem), \ - "i" (offsetof (tcbhead_t, multiple_threads))); \ - else if (sizeof (*mem) == 4) \ - __asm __volatile (lock "addl %1, %0" \ - : "=m" (*mem) \ - : "ir" (value), "m" (*mem), \ - "i" (offsetof (tcbhead_t, multiple_threads))); \ - else \ - { \ - __typeof (value) __addval = (value); \ - __typeof (mem) __memp = (mem); \ - __typeof (*mem) __oldval = *__memp; \ - __typeof (*mem) __tmpval; \ - do \ - __tmpval = __oldval; \ - while ((__oldval = pfx##_compare_and_exchange_val_64_acq \ - (__memp, __oldval + __addval, __oldval)) == __tmpval); \ - } \ - } while (0) - -#define atomic_add(mem, value) \ - __arch_add_body (LOCK_PREFIX, __arch, mem, value) - -#define __arch_add_cprefix \ - "cmpl $0, %%gs:%P3\n\tje 0f\n\tlock\n0:\t" - -#define catomic_add(mem, value) \ - __arch_add_body (__arch_add_cprefix, __arch_c, mem, value) - - -#define atomic_add_negative(mem, value) \ - ({ unsigned char __result; \ - if (sizeof (*mem) == 1) \ - __asm __volatile (LOCK_PREFIX "addb %b2, %0; sets %1" \ - : "=m" (*mem), "=qm" (__result) \ - : "iq" (value), "m" (*mem)); \ - else if (sizeof (*mem) == 2) \ - __asm __volatile (LOCK_PREFIX "addw %w2, %0; sets %1" \ - : "=m" (*mem), "=qm" (__result) \ - : "ir" (value), "m" (*mem)); \ - else if (sizeof (*mem) == 4) \ - __asm __volatile (LOCK_PREFIX "addl %2, %0; sets %1" \ - : "=m" (*mem), "=qm" (__result) \ - : "ir" (value), "m" (*mem)); \ - else \ - abort (); \ - __result; }) - - -#define atomic_add_zero(mem, value) \ - ({ unsigned char __result; \ - if (sizeof (*mem) == 1) \ - __asm __volatile (LOCK_PREFIX "addb %b2, %0; setz %1" \ - : "=m" (*mem), "=qm" (__result) \ - : "iq" (value), "m" (*mem)); \ - else if (sizeof (*mem) == 2) \ - __asm __volatile (LOCK_PREFIX "addw %w2, %0; setz %1" \ - : "=m" (*mem), "=qm" (__result) \ - : "ir" (value), "m" (*mem)); \ - else if (sizeof (*mem) == 4) \ - __asm __volatile (LOCK_PREFIX "addl %2, %0; setz %1" \ - : "=m" (*mem), "=qm" (__result) \ - : "ir" (value), "m" (*mem)); \ - else \ - abort (); \ - __result; }) - - -#define __arch_increment_body(lock, pfx, mem) \ - do { \ - if (sizeof (*mem) == 1) \ - __asm __volatile (lock "incb %b0" \ - : "=m" (*mem) \ - : "m" (*mem), \ - "i" (offsetof (tcbhead_t, multiple_threads))); \ - else if (sizeof (*mem) == 2) \ - __asm __volatile (lock "incw %w0" \ - : "=m" (*mem) \ - : "m" (*mem), \ - "i" (offsetof (tcbhead_t, multiple_threads))); \ - else if (sizeof (*mem) == 4) \ - __asm __volatile (lock "incl %0" \ - : "=m" (*mem) \ - : "m" (*mem), \ - "i" (offsetof (tcbhead_t, multiple_threads))); \ - else \ - { \ - __typeof (mem) __memp = (mem); \ - __typeof (*mem) __oldval = *__memp; \ - __typeof (*mem) __tmpval; \ - do \ - __tmpval = __oldval; \ - while ((__oldval = pfx##_compare_and_exchange_val_64_acq \ - (__memp, __oldval + 1, __oldval)) == __tmpval); \ - } \ - } while (0) - -#define atomic_increment(mem) __arch_increment_body (LOCK_PREFIX, __arch, mem) - -#define __arch_increment_cprefix \ - "cmpl $0, %%gs:%P2\n\tje 0f\n\tlock\n0:\t" - -#define catomic_increment(mem) \ - __arch_increment_body (__arch_increment_cprefix, __arch_c, mem) - - -#define atomic_increment_and_test(mem) \ - ({ unsigned char __result; \ - if (sizeof (*mem) == 1) \ - __asm __volatile (LOCK_PREFIX "incb %0; sete %b1" \ - : "=m" (*mem), "=qm" (__result) \ - : "m" (*mem)); \ - else if (sizeof (*mem) == 2) \ - __asm __volatile (LOCK_PREFIX "incw %0; sete %w1" \ - : "=m" (*mem), "=qm" (__result) \ - : "m" (*mem)); \ - else if (sizeof (*mem) == 4) \ - __asm __volatile (LOCK_PREFIX "incl %0; sete %1" \ - : "=m" (*mem), "=qm" (__result) \ - : "m" (*mem)); \ - else \ - abort (); \ - __result; }) - - -#define __arch_decrement_body(lock, pfx, mem) \ - do { \ - if (sizeof (*mem) == 1) \ - __asm __volatile (lock "decb %b0" \ - : "=m" (*mem) \ - : "m" (*mem), \ - "i" (offsetof (tcbhead_t, multiple_threads))); \ - else if (sizeof (*mem) == 2) \ - __asm __volatile (lock "decw %w0" \ - : "=m" (*mem) \ - : "m" (*mem), \ - "i" (offsetof (tcbhead_t, multiple_threads))); \ - else if (sizeof (*mem) == 4) \ - __asm __volatile (lock "decl %0" \ - : "=m" (*mem) \ - : "m" (*mem), \ - "i" (offsetof (tcbhead_t, multiple_threads))); \ - else \ - { \ - __typeof (mem) __memp = (mem); \ - __typeof (*mem) __oldval = *__memp; \ - __typeof (*mem) __tmpval; \ - do \ - __tmpval = __oldval; \ - while ((__oldval = pfx##_compare_and_exchange_val_64_acq \ - (__memp, __oldval - 1, __oldval)) == __tmpval); \ - } \ - } while (0) - -#define atomic_decrement(mem) __arch_decrement_body (LOCK_PREFIX, __arch, mem) - -#define __arch_decrement_cprefix \ - "cmpl $0, %%gs:%P2\n\tje 0f\n\tlock\n0:\t" - -#define catomic_decrement(mem) \ - __arch_decrement_body (__arch_decrement_cprefix, __arch_c, mem) - - -#define atomic_decrement_and_test(mem) \ - ({ unsigned char __result; \ - if (sizeof (*mem) == 1) \ - __asm __volatile (LOCK_PREFIX "decb %b0; sete %1" \ - : "=m" (*mem), "=qm" (__result) \ - : "m" (*mem)); \ - else if (sizeof (*mem) == 2) \ - __asm __volatile (LOCK_PREFIX "decw %w0; sete %1" \ - : "=m" (*mem), "=qm" (__result) \ - : "m" (*mem)); \ - else if (sizeof (*mem) == 4) \ - __asm __volatile (LOCK_PREFIX "decl %0; sete %1" \ - : "=m" (*mem), "=qm" (__result) \ - : "m" (*mem)); \ - else \ - abort (); \ - __result; }) - - -#define atomic_bit_set(mem, bit) \ - do { \ - if (sizeof (*mem) == 1) \ - __asm __volatile (LOCK_PREFIX "orb %b2, %0" \ - : "=m" (*mem) \ - : "m" (*mem), "iq" (1 << (bit))); \ - else if (sizeof (*mem) == 2) \ - __asm __volatile (LOCK_PREFIX "orw %w2, %0" \ - : "=m" (*mem) \ - : "m" (*mem), "ir" (1 << (bit))); \ - else if (sizeof (*mem) == 4) \ - __asm __volatile (LOCK_PREFIX "orl %2, %0" \ - : "=m" (*mem) \ - : "m" (*mem), "ir" (1 << (bit))); \ - else \ - abort (); \ - } while (0) - - -#define atomic_bit_test_set(mem, bit) \ - ({ unsigned char __result; \ - if (sizeof (*mem) == 1) \ - __asm __volatile (LOCK_PREFIX "btsb %3, %1; setc %0" \ - : "=q" (__result), "=m" (*mem) \ - : "m" (*mem), "ir" (bit)); \ - else if (sizeof (*mem) == 2) \ - __asm __volatile (LOCK_PREFIX "btsw %3, %1; setc %0" \ - : "=q" (__result), "=m" (*mem) \ - : "m" (*mem), "ir" (bit)); \ - else if (sizeof (*mem) == 4) \ - __asm __volatile (LOCK_PREFIX "btsl %3, %1; setc %0" \ - : "=q" (__result), "=m" (*mem) \ - : "m" (*mem), "ir" (bit)); \ - else \ - abort (); \ - __result; }) - - -#define atomic_spin_nop() asm ("rep; nop") - - -#define __arch_and_body(lock, mem, mask) \ - do { \ - if (sizeof (*mem) == 1) \ - __asm __volatile (lock "andb %b1, %0" \ - : "=m" (*mem) \ - : "iq" (mask), "m" (*mem), \ - "i" (offsetof (tcbhead_t, multiple_threads))); \ - else if (sizeof (*mem) == 2) \ - __asm __volatile (lock "andw %w1, %0" \ - : "=m" (*mem) \ - : "ir" (mask), "m" (*mem), \ - "i" (offsetof (tcbhead_t, multiple_threads))); \ - else if (sizeof (*mem) == 4) \ - __asm __volatile (lock "andl %1, %0" \ - : "=m" (*mem) \ - : "ir" (mask), "m" (*mem), \ - "i" (offsetof (tcbhead_t, multiple_threads))); \ - else \ - abort (); \ - } while (0) - -#define __arch_cprefix \ - "cmpl $0, %%gs:%P3\n\tje 0f\n\tlock\n0:\t" - -#define atomic_and(mem, mask) __arch_and_body (LOCK_PREFIX, mem, mask) - -#define catomic_and(mem, mask) __arch_and_body (__arch_cprefix, mem, mask) - - -#define __arch_or_body(lock, mem, mask) \ - do { \ - if (sizeof (*mem) == 1) \ - __asm __volatile (lock "orb %b1, %0" \ - : "=m" (*mem) \ - : "iq" (mask), "m" (*mem), \ - "i" (offsetof (tcbhead_t, multiple_threads))); \ - else if (sizeof (*mem) == 2) \ - __asm __volatile (lock "orw %w1, %0" \ - : "=m" (*mem) \ - : "ir" (mask), "m" (*mem), \ - "i" (offsetof (tcbhead_t, multiple_threads))); \ - else if (sizeof (*mem) == 4) \ - __asm __volatile (lock "orl %1, %0" \ - : "=m" (*mem) \ - : "ir" (mask), "m" (*mem), \ - "i" (offsetof (tcbhead_t, multiple_threads))); \ - else \ - abort (); \ - } while (0) - -#define atomic_or(mem, mask) __arch_or_body (LOCK_PREFIX, mem, mask) - -#define catomic_or(mem, mask) __arch_or_body (__arch_cprefix, mem, mask) - -/* We don't use mfence because it is supposedly slower due to having to - provide stronger guarantees (e.g., regarding self-modifying code). */ -#define atomic_full_barrier() \ - __asm __volatile (LOCK_PREFIX "orl $0, (%%esp)" ::: "memory") -#define atomic_read_barrier() __asm ("" ::: "memory") -#define atomic_write_barrier() __asm ("" ::: "memory") diff --git a/sysdeps/x86_64/atomic-machine.h b/sysdeps/x86/atomic-machine.h index 9d31c64962..b06de58190 100644 --- a/sysdeps/x86_64/atomic-machine.h +++ b/sysdeps/x86/atomic-machine.h @@ -1,6 +1,6 @@ -/* Copyright (C) 2002-2018 Free Software Foundation, Inc. +/* Atomic operations. X86 version. + Copyright (C) 2018 Free Software Foundation, Inc. This file is part of the GNU C Library. - Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public @@ -16,12 +16,12 @@ License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ -#ifndef _X86_64_ATOMIC_MACHINE_H -#define _X86_64_ATOMIC_MACHINE_H 1 +#ifndef _X86_ATOMIC_MACHINE_H +#define _X86_ATOMIC_MACHINE_H 1 #include <stdint.h> -#include <tls.h> /* For tcbhead_t. */ -#include <libc-pointer-arith.h> /* For cast_to_integer. */ +#include <tls.h> /* For tcbhead_t. */ +#include <libc-pointer-arith.h> /* For cast_to_integer. */ typedef int8_t atomic8_t; typedef uint8_t uatomic8_t; @@ -57,9 +57,22 @@ typedef uintmax_t uatomic_max_t; # endif #endif -#define __HAVE_64B_ATOMICS 1 -#define USE_ATOMIC_COMPILER_BUILTINS 1 -#define ATOMIC_EXCHANGE_USES_CAS 0 +#define USE_ATOMIC_COMPILER_BUILTINS 1 + +#ifdef __x86_64__ +# define __HAVE_64B_ATOMICS 1 +# define SP_REG "rsp" +# define SEG_REG "fs" +# define BR_CONSTRAINT "q" +# define IBR_CONSTRAINT "iq" +#else +# define __HAVE_64B_ATOMICS 0 +# define SP_REG "esp" +# define SEG_REG "gs" +# define BR_CONSTRAINT "r" +# define IBR_CONSTRAINT "ir" +#endif +#define ATOMIC_EXCHANGE_USES_CAS 0 #define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \ __sync_val_compare_and_swap (mem, oldval, newval) @@ -69,38 +82,39 @@ typedef uintmax_t uatomic_max_t; #define __arch_c_compare_and_exchange_val_8_acq(mem, newval, oldval) \ ({ __typeof (*mem) ret; \ - __asm __volatile ("cmpl $0, %%fs:%P5\n\t" \ - "je 0f\n\t" \ - "lock\n" \ + __asm __volatile ("cmpl $0, %%" SEG_REG ":%P5\n\t" \ + "je 0f\n\t" \ + "lock\n" \ "0:\tcmpxchgb %b2, %1" \ : "=a" (ret), "=m" (*mem) \ - : "q" (newval), "m" (*mem), "0" (oldval), \ + : BR_CONSTRAINT (newval), "m" (*mem), "0" (oldval), \ "i" (offsetof (tcbhead_t, multiple_threads))); \ ret; }) #define __arch_c_compare_and_exchange_val_16_acq(mem, newval, oldval) \ ({ __typeof (*mem) ret; \ - __asm __volatile ("cmpl $0, %%fs:%P5\n\t" \ - "je 0f\n\t" \ - "lock\n" \ + __asm __volatile ("cmpl $0, %%" SEG_REG ":%P5\n\t" \ + "je 0f\n\t" \ + "lock\n" \ "0:\tcmpxchgw %w2, %1" \ : "=a" (ret), "=m" (*mem) \ - : "q" (newval), "m" (*mem), "0" (oldval), \ + : BR_CONSTRAINT (newval), "m" (*mem), "0" (oldval), \ "i" (offsetof (tcbhead_t, multiple_threads))); \ ret; }) #define __arch_c_compare_and_exchange_val_32_acq(mem, newval, oldval) \ ({ __typeof (*mem) ret; \ - __asm __volatile ("cmpl $0, %%fs:%P5\n\t" \ - "je 0f\n\t" \ - "lock\n" \ + __asm __volatile ("cmpl $0, %%" SEG_REG ":%P5\n\t" \ + "je 0f\n\t" \ + "lock\n" \ "0:\tcmpxchgl %2, %1" \ : "=a" (ret), "=m" (*mem) \ - : "q" (newval), "m" (*mem), "0" (oldval), \ - "i" (offsetof (tcbhead_t, multiple_threads))); \ + : BR_CONSTRAINT (newval), "m" (*mem), "0" (oldval), \ + "i" (offsetof (tcbhead_t, multiple_threads))); \ ret; }) -#define __arch_c_compare_and_exchange_val_64_acq(mem, newval, oldval) \ +#ifdef __x86_64__ +# define __arch_c_compare_and_exchange_val_64_acq(mem, newval, oldval) \ ({ __typeof (*mem) ret; \ __asm __volatile ("cmpl $0, %%fs:%P5\n\t" \ "je 0f\n\t" \ @@ -112,6 +126,53 @@ typedef uintmax_t uatomic_max_t; "0" ((atomic64_t) cast_to_integer (oldval)), \ "i" (offsetof (tcbhead_t, multiple_threads))); \ ret; }) +# define do_exchange_and_add_val_64_acq(pfx, mem, value) 0 +# define do_add_val_64_acq(pfx, mem, value) do { } while (0) +#else +/* XXX We do not really need 64-bit compare-and-exchange. At least + not in the moment. Using it would mean causing portability + problems since not many other 32-bit architectures have support for + such an operation. So don't define any code for now. If it is + really going to be used the code below can be used on Intel Pentium + and later, but NOT on i486. */ +# define __arch_c_compare_and_exchange_val_64_acq(mem, newval, oldval) \ + ({ __typeof (*mem) ret = *(mem); \ + __atomic_link_error (); \ + ret = (newval); \ + ret = (oldval); \ + ret; }) + +# define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \ + ({ __typeof (*mem) ret = *(mem); \ + __atomic_link_error (); \ + ret = (newval); \ + ret = (oldval); \ + ret; }) + +# define do_exchange_and_add_val_64_acq(pfx, mem, value) \ + ({ __typeof (value) __addval = (value); \ + __typeof (*mem) __result; \ + __typeof (mem) __memp = (mem); \ + __typeof (*mem) __tmpval; \ + __result = *__memp; \ + do \ + __tmpval = __result; \ + while ((__result = pfx##_compare_and_exchange_val_64_acq \ + (__memp, __result + __addval, __result)) == __tmpval); \ + __result; }) + +# define do_add_val_64_acq(pfx, mem, value) \ + { \ + __typeof (value) __addval = (value); \ + __typeof (mem) __memp = (mem); \ + __typeof (*mem) __oldval = *__memp; \ + __typeof (*mem) __tmpval; \ + do \ + __tmpval = __oldval; \ + while ((__oldval = pfx##_compare_and_exchange_val_64_acq \ + (__memp, __oldval + __addval, __oldval)) == __tmpval); \ + } +#endif /* Note that we need no lock prefix. */ @@ -129,50 +190,59 @@ typedef uintmax_t uatomic_max_t; __asm __volatile ("xchgl %0, %1" \ : "=r" (result), "=m" (*mem) \ : "0" (newvalue), "m" (*mem)); \ - else \ + else if (__HAVE_64B_ATOMICS) \ __asm __volatile ("xchgq %q0, %1" \ : "=r" (result), "=m" (*mem) \ : "0" ((atomic64_t) cast_to_integer (newvalue)), \ "m" (*mem)); \ + else \ + { \ + result = 0; \ + __atomic_link_error (); \ + } \ result; }) -#define __arch_exchange_and_add_body(lock, mem, value) \ - ({ __typeof (*mem) result; \ +#define __arch_exchange_and_add_body(lock, pfx, mem, value) \ + ({ __typeof (*mem) __result; \ + __typeof (value) __addval = (value); \ if (sizeof (*mem) == 1) \ __asm __volatile (lock "xaddb %b0, %1" \ - : "=q" (result), "=m" (*mem) \ - : "0" (value), "m" (*mem), \ + : "=q" (__result), "=m" (*mem) \ + : "0" (__addval), "m" (*mem), \ "i" (offsetof (tcbhead_t, multiple_threads))); \ else if (sizeof (*mem) == 2) \ __asm __volatile (lock "xaddw %w0, %1" \ - : "=r" (result), "=m" (*mem) \ - : "0" (value), "m" (*mem), \ + : "=r" (__result), "=m" (*mem) \ + : "0" (__addval), "m" (*mem), \ "i" (offsetof (tcbhead_t, multiple_threads))); \ else if (sizeof (*mem) == 4) \ __asm __volatile (lock "xaddl %0, %1" \ - : "=r" (result), "=m" (*mem) \ - : "0" (value), "m" (*mem), \ + : "=r" (__result), "=m" (*mem) \ + : "0" (__addval), "m" (*mem), \ "i" (offsetof (tcbhead_t, multiple_threads))); \ - else \ + else if (__HAVE_64B_ATOMICS) \ __asm __volatile (lock "xaddq %q0, %1" \ - : "=r" (result), "=m" (*mem) \ - : "0" ((atomic64_t) cast_to_integer (value)), \ + : "=r" (__result), "=m" (*mem) \ + : "0" ((atomic64_t) cast_to_integer (__addval)), \ "m" (*mem), \ "i" (offsetof (tcbhead_t, multiple_threads))); \ - result; }) + else \ + __result = do_exchange_and_add_val_64_acq (pfx, (mem), __addval); \ + __result; }) #define atomic_exchange_and_add(mem, value) \ __sync_fetch_and_add (mem, value) #define __arch_exchange_and_add_cprefix \ - "cmpl $0, %%fs:%P4\n\tje 0f\n\tlock\n0:\t" + "cmpl $0, %%" SEG_REG ":%P4\n\tje 0f\n\tlock\n0:\t" #define catomic_exchange_and_add(mem, value) \ - __arch_exchange_and_add_body (__arch_exchange_and_add_cprefix, mem, value) + __arch_exchange_and_add_body (__arch_exchange_and_add_cprefix, __arch_c, \ + mem, value) -#define __arch_add_body(lock, pfx, mem, value) \ +#define __arch_add_body(lock, pfx, apfx, mem, value) \ do { \ if (__builtin_constant_p (value) && (value) == 1) \ pfx##_increment (mem); \ @@ -181,7 +251,7 @@ typedef uintmax_t uatomic_max_t; else if (sizeof (*mem) == 1) \ __asm __volatile (lock "addb %b1, %0" \ : "=m" (*mem) \ - : "iq" (value), "m" (*mem), \ + : IBR_CONSTRAINT (value), "m" (*mem), \ "i" (offsetof (tcbhead_t, multiple_threads))); \ else if (sizeof (*mem) == 2) \ __asm __volatile (lock "addw %w1, %0" \ @@ -193,22 +263,24 @@ typedef uintmax_t uatomic_max_t; : "=m" (*mem) \ : "ir" (value), "m" (*mem), \ "i" (offsetof (tcbhead_t, multiple_threads))); \ - else \ + else if (__HAVE_64B_ATOMICS) \ __asm __volatile (lock "addq %q1, %0" \ : "=m" (*mem) \ : "ir" ((atomic64_t) cast_to_integer (value)), \ "m" (*mem), \ "i" (offsetof (tcbhead_t, multiple_threads))); \ + else \ + do_add_val_64_acq (apfx, (mem), (value)); \ } while (0) -#define atomic_add(mem, value) \ - __arch_add_body (LOCK_PREFIX, atomic, mem, value) +# define atomic_add(mem, value) \ + __arch_add_body (LOCK_PREFIX, atomic, __arch, mem, value) #define __arch_add_cprefix \ - "cmpl $0, %%fs:%P3\n\tje 0f\n\tlock\n0:\t" + "cmpl $0, %%" SEG_REG ":%P3\n\tje 0f\n\tlock\n0:\t" #define catomic_add(mem, value) \ - __arch_add_body (__arch_add_cprefix, catomic, mem, value) + __arch_add_body (__arch_add_cprefix, atomic, __arch_c, mem, value) #define atomic_add_negative(mem, value) \ @@ -216,7 +288,7 @@ typedef uintmax_t uatomic_max_t; if (sizeof (*mem) == 1) \ __asm __volatile (LOCK_PREFIX "addb %b2, %0; sets %1" \ : "=m" (*mem), "=qm" (__result) \ - : "iq" (value), "m" (*mem)); \ + : IBR_CONSTRAINT (value), "m" (*mem)); \ else if (sizeof (*mem) == 2) \ __asm __volatile (LOCK_PREFIX "addw %w2, %0; sets %1" \ : "=m" (*mem), "=qm" (__result) \ @@ -225,11 +297,13 @@ typedef uintmax_t uatomic_max_t; __asm __volatile (LOCK_PREFIX "addl %2, %0; sets %1" \ : "=m" (*mem), "=qm" (__result) \ : "ir" (value), "m" (*mem)); \ - else \ + else if (__HAVE_64B_ATOMICS) \ __asm __volatile (LOCK_PREFIX "addq %q2, %0; sets %1" \ : "=m" (*mem), "=qm" (__result) \ : "ir" ((atomic64_t) cast_to_integer (value)), \ "m" (*mem)); \ + else \ + __atomic_link_error (); \ __result; }) @@ -238,7 +312,7 @@ typedef uintmax_t uatomic_max_t; if (sizeof (*mem) == 1) \ __asm __volatile (LOCK_PREFIX "addb %b2, %0; setz %1" \ : "=m" (*mem), "=qm" (__result) \ - : "iq" (value), "m" (*mem)); \ + : IBR_CONSTRAINT (value), "m" (*mem)); \ else if (sizeof (*mem) == 2) \ __asm __volatile (LOCK_PREFIX "addw %w2, %0; setz %1" \ : "=m" (*mem), "=qm" (__result) \ @@ -247,15 +321,17 @@ typedef uintmax_t uatomic_max_t; __asm __volatile (LOCK_PREFIX "addl %2, %0; setz %1" \ : "=m" (*mem), "=qm" (__result) \ : "ir" (value), "m" (*mem)); \ - else \ + else if (__HAVE_64B_ATOMICS) \ __asm __volatile (LOCK_PREFIX "addq %q2, %0; setz %1" \ : "=m" (*mem), "=qm" (__result) \ : "ir" ((atomic64_t) cast_to_integer (value)), \ "m" (*mem)); \ + else \ + __atomic_link_error (); \ __result; }) -#define __arch_increment_body(lock, mem) \ +#define __arch_increment_body(lock, pfx, mem) \ do { \ if (sizeof (*mem) == 1) \ __asm __volatile (lock "incb %b0" \ @@ -272,44 +348,48 @@ typedef uintmax_t uatomic_max_t; : "=m" (*mem) \ : "m" (*mem), \ "i" (offsetof (tcbhead_t, multiple_threads))); \ - else \ + else if (__HAVE_64B_ATOMICS) \ __asm __volatile (lock "incq %q0" \ : "=m" (*mem) \ : "m" (*mem), \ "i" (offsetof (tcbhead_t, multiple_threads))); \ + else \ + do_add_val_64_acq (pfx, mem, 1); \ } while (0) -#define atomic_increment(mem) __arch_increment_body (LOCK_PREFIX, mem) +#define atomic_increment(mem) __arch_increment_body (LOCK_PREFIX, __arch, mem) #define __arch_increment_cprefix \ - "cmpl $0, %%fs:%P2\n\tje 0f\n\tlock\n0:\t" + "cmpl $0, %%" SEG_REG ":%P2\n\tje 0f\n\tlock\n0:\t" #define catomic_increment(mem) \ - __arch_increment_body (__arch_increment_cprefix, mem) + __arch_increment_body (__arch_increment_cprefix, __arch_c, mem) #define atomic_increment_and_test(mem) \ ({ unsigned char __result; \ if (sizeof (*mem) == 1) \ - __asm __volatile (LOCK_PREFIX "incb %b0; sete %1" \ + __asm __volatile (LOCK_PREFIX "incb %b0; sete %b1" \ : "=m" (*mem), "=qm" (__result) \ : "m" (*mem)); \ else if (sizeof (*mem) == 2) \ - __asm __volatile (LOCK_PREFIX "incw %w0; sete %1" \ + __asm __volatile (LOCK_PREFIX "incw %w0; sete %w1" \ : "=m" (*mem), "=qm" (__result) \ : "m" (*mem)); \ else if (sizeof (*mem) == 4) \ __asm __volatile (LOCK_PREFIX "incl %0; sete %1" \ : "=m" (*mem), "=qm" (__result) \ : "m" (*mem)); \ - else \ + else if (__HAVE_64B_ATOMICS) \ __asm __volatile (LOCK_PREFIX "incq %q0; sete %1" \ : "=m" (*mem), "=qm" (__result) \ : "m" (*mem)); \ + else \ + __atomic_link_error (); \ __result; }) -#define __arch_decrement_body(lock, mem) \ +#define __arch_decrement_body(lock, pfx, mem) \ do { \ if (sizeof (*mem) == 1) \ __asm __volatile (lock "decb %b0" \ @@ -326,20 +406,22 @@ typedef uintmax_t uatomic_max_t; : "=m" (*mem) \ : "m" (*mem), \ "i" (offsetof (tcbhead_t, multiple_threads))); \ - else \ + else if (__HAVE_64B_ATOMICS) \ __asm __volatile (lock "decq %q0" \ : "=m" (*mem) \ : "m" (*mem), \ "i" (offsetof (tcbhead_t, multiple_threads))); \ + else \ + do_add_val_64_acq (pfx, mem, -1); \ } while (0) -#define atomic_decrement(mem) __arch_decrement_body (LOCK_PREFIX, mem) +#define atomic_decrement(mem) __arch_decrement_body (LOCK_PREFIX, __arch, mem) #define __arch_decrement_cprefix \ - "cmpl $0, %%fs:%P2\n\tje 0f\n\tlock\n0:\t" + "cmpl $0, %%" SEG_REG ":%P2\n\tje 0f\n\tlock\n0:\t" #define catomic_decrement(mem) \ - __arch_decrement_body (__arch_decrement_cprefix, mem) + __arch_decrement_body (__arch_decrement_cprefix, __arch_c, mem) #define atomic_decrement_and_test(mem) \ @@ -368,7 +450,7 @@ typedef uintmax_t uatomic_max_t; if (sizeof (*mem) == 1) \ __asm __volatile (LOCK_PREFIX "orb %b2, %0" \ : "=m" (*mem) \ - : "m" (*mem), "iq" (1L << (bit))); \ + : "m" (*mem), IBR_CONSTRAINT (1L << (bit))); \ else if (sizeof (*mem) == 2) \ __asm __volatile (LOCK_PREFIX "orw %w2, %0" \ : "=m" (*mem) \ @@ -381,10 +463,12 @@ typedef uintmax_t uatomic_max_t; __asm __volatile (LOCK_PREFIX "orq %2, %0" \ : "=m" (*mem) \ : "m" (*mem), "i" (1L << (bit))); \ - else \ + else if (__HAVE_64B_ATOMICS) \ __asm __volatile (LOCK_PREFIX "orq %q2, %0" \ : "=m" (*mem) \ : "m" (*mem), "r" (1UL << (bit))); \ + else \ + __atomic_link_error (); \ } while (0) @@ -393,7 +477,7 @@ typedef uintmax_t uatomic_max_t; if (sizeof (*mem) == 1) \ __asm __volatile (LOCK_PREFIX "btsb %3, %1; setc %0" \ : "=q" (__result), "=m" (*mem) \ - : "m" (*mem), "iq" (bit)); \ + : "m" (*mem), IBR_CONSTRAINT (bit)); \ else if (sizeof (*mem) == 2) \ __asm __volatile (LOCK_PREFIX "btsw %3, %1; setc %0" \ : "=q" (__result), "=m" (*mem) \ @@ -402,22 +486,21 @@ typedef uintmax_t uatomic_max_t; __asm __volatile (LOCK_PREFIX "btsl %3, %1; setc %0" \ : "=q" (__result), "=m" (*mem) \ : "m" (*mem), "ir" (bit)); \ - else \ + else if (__HAVE_64B_ATOMICS) \ __asm __volatile (LOCK_PREFIX "btsq %3, %1; setc %0" \ : "=q" (__result), "=m" (*mem) \ : "m" (*mem), "ir" (bit)); \ + else \ + __atomic_link_error (); \ __result; }) -#define atomic_spin_nop() asm ("rep; nop") - - #define __arch_and_body(lock, mem, mask) \ do { \ if (sizeof (*mem) == 1) \ __asm __volatile (lock "andb %b1, %0" \ : "=m" (*mem) \ - : "iq" (mask), "m" (*mem), \ + : IBR_CONSTRAINT (mask), "m" (*mem), \ "i" (offsetof (tcbhead_t, multiple_threads))); \ else if (sizeof (*mem) == 2) \ __asm __volatile (lock "andw %w1, %0" \ @@ -429,27 +512,29 @@ typedef uintmax_t uatomic_max_t; : "=m" (*mem) \ : "ir" (mask), "m" (*mem), \ "i" (offsetof (tcbhead_t, multiple_threads))); \ - else \ + else if (__HAVE_64B_ATOMICS) \ __asm __volatile (lock "andq %q1, %0" \ : "=m" (*mem) \ : "ir" (mask), "m" (*mem), \ "i" (offsetof (tcbhead_t, multiple_threads))); \ + else \ + __atomic_link_error (); \ } while (0) #define __arch_cprefix \ - "cmpl $0, %%fs:%P3\n\tje 0f\n\tlock\n0:\t" + "cmpl $0, %%" SEG_REG ":%P3\n\tje 0f\n\tlock\n0:\t" #define atomic_and(mem, mask) __arch_and_body (LOCK_PREFIX, mem, mask) #define catomic_and(mem, mask) __arch_and_body (__arch_cprefix, mem, mask) -#define __arch_or_body(lock, mem, mask) \ +#define __arch_or_body(lock, mem, mask) \ do { \ if (sizeof (*mem) == 1) \ __asm __volatile (lock "orb %b1, %0" \ : "=m" (*mem) \ - : "iq" (mask), "m" (*mem), \ + : IBR_CONSTRAINT (mask), "m" (*mem), \ "i" (offsetof (tcbhead_t, multiple_threads))); \ else if (sizeof (*mem) == 2) \ __asm __volatile (lock "orw %w1, %0" \ @@ -461,11 +546,13 @@ typedef uintmax_t uatomic_max_t; : "=m" (*mem) \ : "ir" (mask), "m" (*mem), \ "i" (offsetof (tcbhead_t, multiple_threads))); \ - else \ + else if (__HAVE_64B_ATOMICS) \ __asm __volatile (lock "orq %q1, %0" \ : "=m" (*mem) \ : "ir" (mask), "m" (*mem), \ "i" (offsetof (tcbhead_t, multiple_threads))); \ + else \ + __atomic_link_error (); \ } while (0) #define atomic_or(mem, mask) __arch_or_body (LOCK_PREFIX, mem, mask) @@ -475,8 +562,10 @@ typedef uintmax_t uatomic_max_t; /* We don't use mfence because it is supposedly slower due to having to provide stronger guarantees (e.g., regarding self-modifying code). */ #define atomic_full_barrier() \ - __asm __volatile (LOCK_PREFIX "orl $0, (%%rsp)" ::: "memory") + __asm __volatile (LOCK_PREFIX "orl $0, (%%" SP_REG ")" ::: "memory") #define atomic_read_barrier() __asm ("" ::: "memory") #define atomic_write_barrier() __asm ("" ::: "memory") +#define atomic_spin_nop() __asm ("pause") + #endif /* atomic-machine.h */ |