/* Atomic operations used inside libc. Linux/SH version. 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; /* SH kernel has implemented a gUSA ("g" User Space Atomicity) support for the user space atomicity. The atomicity macros use this scheme. Reference: Niibe Yutaka, "gUSA: Simple and Efficient User Space Atomicity Emulation with Little Kernel Modification", Linux Conference 2002, Japan. http://lc.linux.or.jp/lc2002/papers/niibe0919h.pdf (in Japanese). B.N. Bershad, D. Redell, and J. Ellis, "Fast Mutual Exclusion for Uniprocessors", Proceedings of the Fifth Architectural Support for Programming Languages and Operating Systems (ASPLOS), pp. 223-233, October 1992. http://www.cs.washington.edu/homes/bershad/Papers/Rcs.ps SuperH ABI: r15: -(size of atomic instruction sequence) < 0 r0: end point r1: saved stack pointer */ #define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval) \ ({ __typeof (*(mem)) __result; \ __asm __volatile ("\ .align 2\n\ mova 1f,r0\n\ nop\n\ mov r15,r1\n\ mov #-8,r15\n\ 0: mov.b @%1,%0\n\ cmp/eq %0,%3\n\ bf 1f\n\ mov.b %2,@%1\n\ 1: mov r1,r15"\ : "=&r" (__result) : "r" (mem), "r" (newval), "r" (oldval) \ : "r0", "r1", "t", "memory"); \ __result; }) #define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \ ({ __typeof (*(mem)) __result; \ __asm __volatile ("\ .align 2\n\ mova 1f,r0\n\ nop\n\ mov r15,r1\n\ mov #-8,r15\n\ 0: mov.w @%1,%0\n\ cmp/eq %0,%3\n\ bf 1f\n\ mov.w %2,@%1\n\ 1: mov r1,r15"\ : "=&r" (__result) : "r" (mem), "r" (newval), "r" (oldval) \ : "r0", "r1", "t", "memory"); \ __result; }) #define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \ ({ __typeof (*(mem)) __result; \ __asm __volatile ("\ .align 2\n\ mova 1f,r0\n\ nop\n\ mov r15,r1\n\ mov #-8,r15\n\ 0: mov.l @%1,%0\n\ cmp/eq %0,%3\n\ bf 1f\n\ mov.l %2,@%1\n\ 1: mov r1,r15"\ : "=&r" (__result) : "r" (mem), "r" (newval), "r" (oldval) \ : "r0", "r1", "t", "memory"); \ __result; }) /* 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. */ # define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \ (abort (), (__typeof (*mem)) 0) #define atomic_exchange_and_add(mem, value) \ ({ __typeof (*(mem)) __result, __tmp, __value = (value); \ if (sizeof (*(mem)) == 1) \ __asm __volatile ("\ .align 2\n\ mova 1f,r0\n\ mov r15,r1\n\ mov #-6,r15\n\ 0: mov.b @%2,%0\n\ add %0,%1\n\ mov.b %1,@%2\n\ 1: mov r1,r15"\ : "=&r" (__result), "=&r" (__tmp) : "r" (mem), "1" (__value) \ : "r0", "r1", "memory"); \ else if (sizeof (*(mem)) == 2) \ __asm __volatile ("\ .align 2\n\ mova 1f,r0\n\ mov r15,r1\n\ mov #-6,r15\n\ 0: mov.w @%2,%0\n\ add %0,%1\n\ mov.w %1,@%2\n\ 1: mov r1,r15"\ : "=&r" (__result), "=&r" (__tmp) : "r" (mem), "1" (__value) \ : "r0", "r1", "memory"); \ else if (sizeof (*(mem)) == 4) \ __asm __volatile ("\ .align 2\n\ mova 1f,r0\n\ mov r15,r1\n\ mov #-6,r15\n\ 0: mov.l @%2,%0\n\ add %0,%1\n\ mov.l %1,@%2\n\ 1: mov r1,r15"\ : "=&r" (__result), "=&r" (__tmp) : "r" (mem), "1" (__value) \ : "r0", "r1", "memory"); \ else \ { \ __typeof (mem) memp = (mem); \ do \ __result = *memp; \ while (__arch_compare_and_exchange_val_64_acq \ (memp, __result + __value, __result) == __result); \ (void) __value; \ } \ __result; }) #define atomic_add(mem, value) \ (void) ({ __typeof (*(mem)) __tmp, __value = (value); \ if (sizeof (*(mem)) == 1) \ __asm __volatile ("\ .align 2\n\ mova 1f,r0\n\ mov r15,r1\n\ mov #-6,r15\n\ 0: mov.b @%1,r2\n\ add r2,%0\n\ mov.b %0,@%1\n\ 1: mov r1,r15"\ : "=&r" (__tmp) : "r" (mem), "0" (__value) \ : "r0", "r1", "r2", "memory"); \ else if (sizeof (*(mem)) == 2) \ __asm __volatile ("\ .align 2\n\ mova 1f,r0\n\ mov r15,r1\n\ mov #-6,r15\n\ 0: mov.w @%1,r2\n\ add r2,%0\n\ mov.w %0,@%1\n\ 1: mov r1,r15"\ : "=&r" (__tmp) : "r" (mem), "0" (__value) \ : "r0", "r1", "r2", "memory"); \ else if (sizeof (*(mem)) == 4) \ __asm __volatile ("\ .align 2\n\ mova 1f,r0\n\ mov r15,r1\n\ mov #-6,r15\n\ 0: mov.l @%1,r2\n\ add r2,%0\n\ mov.l %0,@%1\n\ 1: mov r1,r15"\ : "=&r" (__tmp) : "r" (mem), "0" (__value) \ : "r0", "r1", "r2", "memory"); \ else \ { \ __typeof (*(mem)) oldval; \ __typeof (mem) memp = (mem); \ do \ oldval = *memp; \ while (__arch_compare_and_exchange_val_64_acq \ (memp, oldval + __value, oldval) == oldval); \ (void) __value; \ } \ }) #define atomic_add_negative(mem, value) \ ({ unsigned char __result; \ __typeof (*(mem)) __tmp, __value = (value); \ if (sizeof (*(mem)) == 1) \ __asm __volatile ("\ .align 2\n\ mova 1f,r0\n\ mov r15,r1\n\ mov #-6,r15\n\ 0: mov.b @%2,r2\n\ add r2,%1\n\ mov.b %1,@%2\n\ 1: mov r1,r15\n\ shal %1\n\ movt %0"\ : "=r" (__result), "=&r" (__tmp) : "r" (mem), "1" (__value) \ : "r0", "r1", "r2", "t", "memory"); \ else if (sizeof (*(mem)) == 2) \ __asm __volatile ("\ .align 2\n\ mova 1f,r0\n\ mov r15,r1\n\ mov #-6,r15\n\ 0: mov.w @%2,r2\n\ add r2,%1\n\ mov.w %1,@%2\n\ 1: mov r1,r15\n\ shal %1\n\ movt %0"\ : "=r" (__result), "=&r" (__tmp) : "r" (mem), "1" (__value) \ : "r0", "r1", "r2", "t", "memory"); \ else if (sizeof (*(mem)) == 4) \ __asm __volatile ("\ .align 2\n\ mova 1f,r0\n\ mov r15,r1\n\ mov #-6,r15\n\ 0: mov.l @%2,r2\n\ add r2,%1\n\ mov.l %1,@%2\n\ 1: mov r1,r15\n\ shal %1\n\ movt %0"\ : "=r" (__result), "=&r" (__tmp) : "r" (mem), "1" (__value) \ : "r0", "r1", "r2", "t", "memory"); \ else \ abort (); \ __result; }) #define atomic_add_zero(mem, value) \ ({ unsigned char __result; \ __typeof (*(mem)) __tmp, __value = (value); \ if (sizeof (*(mem)) == 1) \ __asm __volatile ("\ .align 2\n\ mova 1f,r0\n\ mov r15,r1\n\ mov #-6,r15\n\ 0: mov.b @%2,r2\n\ add r2,%1\n\ mov.b %1,@%2\n\ 1: mov r1,r15\n\ tst %1,%1\n\ movt %0"\ : "=r" (__result), "=&r" (__tmp) : "r" (mem), "1" (__value) \ : "r0", "r1", "r2", "t", "memory"); \ else if (sizeof (*(mem)) == 2) \ __asm __volatile ("\ .align 2\n\ mova 1f,r0\n\ mov r15,r1\n\ mov #-6,r15\n\ 0: mov.w @%2,r2\n\ add r2,%1\n\ mov.w %1,@%2\n\ 1: mov r1,r15\n\ tst %1,%1\n\ movt %0"\ : "=r" (__result), "=&r" (__tmp) : "r" (mem), "1" (__value) \ : "r0", "r1", "r2", "t", "memory"); \ else if (sizeof (*(mem)) == 4) \ __asm __volatile ("\ .align 2\n\ mova 1f,r0\n\ mov r15,r1\n\ mov #-6,r15\n\ 0: mov.l @%2,r2\n\ add r2,%1\n\ mov.l %1,@%2\n\ 1: mov r1,r15\n\ tst %1,%1\n\ movt %0"\ : "=r" (__result), "=&r" (__tmp) : "r" (mem), "1" (__value) \ : "r0", "r1", "r2", "t", "memory"); \ else \ abort (); \ __result; }) #define atomic_increment_and_test(mem) atomic_add_zero((mem), 1) #define atomic_decrement_and_test(mem) atomic_add_zero((mem), -1) #define atomic_bit_set(mem, bit) \ (void) ({ unsigned int __mask = 1 << (bit); \ if (sizeof (*(mem)) == 1) \ __asm __volatile ("\ .align 2\n\ mova 1f,r0\n\ mov r15,r1\n\ mov #-6,r15\n\ 0: mov.b @%0,r2\n\ or %1,r2\n\ mov.b r2,@%0\n\ 1: mov r1,r15"\ : : "r" (mem), "r" (__mask) \ : "r0", "r1", "r2", "memory"); \ else if (sizeof (*(mem)) == 2) \ __asm __volatile ("\ .align 2\n\ mova 1f,r0\n\ mov r15,r1\n\ mov #-6,r15\n\ 0: mov.w @%0,r2\n\ or %1,r2\n\ mov.w r2,@%0\n\ 1: mov r1,r15"\ : : "r" (mem), "r" (__mask) \ : "r0", "r1", "r2", "memory"); \ else if (sizeof (*(mem)) == 4) \ __asm __volatile ("\ .align 2\n\ mova 1f,r0\n\ mov r15,r1\n\ mov #-6,r15\n\ 0: mov.l @%0,r2\n\ or %1,r2\n\ mov.l r2,@%0\n\ 1: mov r1,r15"\ : : "r" (mem), "r" (__mask) \ : "r0", "r1", "r2", "memory"); \ else \ abort (); \ }) #define atomic_bit_test_set(mem, bit) \ ({ unsigned int __mask = 1 << (bit); \ unsigned int __result = __mask; \ if (sizeof (*(mem)) == 1) \ __asm __volatile ("\ .align 2\n\ mova 1f,r0\n\ nop\n\ mov r15,r1\n\ mov #-8,r15\n\ 0: mov.b @%2,r2\n\ or r2,%1\n\ and r2,%0\n\ mov.b %1,@%2\n\ 1: mov r1,r15"\ : "=&r" (__result), "=&r" (__mask) \ : "r" (mem), "0" (__result), "1" (__mask) \ : "r0", "r1", "r2", "memory"); \ else if (sizeof (*(mem)) == 2) \ __asm __volatile ("\ .align 2\n\ mova 1f,r0\n\ nop\n\ mov r15,r1\n\ mov #-8,r15\n\ 0: mov.w @%2,r2\n\ or r2,%1\n\ and r2,%0\n\ mov.w %1,@%2\n\ 1: mov r1,r15"\ : "=&r" (__result), "=&r" (__mask) \ : "r" (mem), "0" (__result), "1" (__mask) \ : "r0", "r1", "r2", "memory"); \ else if (sizeof (*(mem)) == 4) \ __asm __volatile ("\ .align 2\n\ mova 1f,r0\n\ nop\n\ mov r15,r1\n\ mov #-8,r15\n\ 0: mov.l @%2,r2\n\ or r2,%1\n\ and r2,%0\n\ mov.l %1,@%2\n\ 1: mov r1,r15"\ : "=&r" (__result), "=&r" (__mask) \ : "r" (mem), "0" (__result), "1" (__mask) \ : "r0", "r1", "r2", "memory"); \ else \ abort (); \ __result; })