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/* Atomic operations used inside libc. Linux/SH version.
Copyright (C) 2003-2023 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, see
<https://www.gnu.org/licenses/>. */
#define __HAVE_64B_ATOMICS 0
#define USE_ATOMIC_COMPILER_BUILTINS 0
/* XXX Is this actually correct? */
#define ATOMIC_EXCHANGE_USES_CAS 1
/* 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 ("\
mova 1f,r0\n\
.align 2\n\
mov r15,r1\n\
mov #(0f-1f),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) : "u" (mem), "u" (newval), "u" (oldval) \
: "r0", "r1", "t", "memory"); \
__result; })
#define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \
({ __typeof (*(mem)) __result; \
__asm __volatile ("\
mova 1f,r0\n\
mov r15,r1\n\
.align 2\n\
mov #(0f-1f),r15\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) : "u" (mem), "u" (newval), "u" (oldval) \
: "r0", "r1", "t", "memory"); \
__result; })
#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
({ __typeof (*(mem)) __result; \
__asm __volatile ("\
mova 1f,r0\n\
.align 2\n\
mov r15,r1\n\
mov #(0f-1f),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) : "u" (mem), "u" (newval), "u" (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 ("\
mova 1f,r0\n\
.align 2\n\
mov r15,r1\n\
mov #(0f-1f),r15\n\
0: mov.b @%2,%0\n\
mov %1,r2\n\
add %0,r2\n\
mov.b r2,@%2\n\
1: mov r1,r15"\
: "=&r" (__result), "=&r" (__tmp) : "u" (mem), "1" (__value) \
: "r0", "r1", "r2", "memory"); \
else if (sizeof (*(mem)) == 2) \
__asm __volatile ("\
mova 1f,r0\n\
.align 2\n\
mov r15,r1\n\
mov #(0f-1f),r15\n\
0: mov.w @%2,%0\n\
mov %1,r2\n\
add %0,r2\n\
mov.w r2,@%2\n\
1: mov r1,r15"\
: "=&r" (__result), "=&r" (__tmp) : "u" (mem), "1" (__value) \
: "r0", "r1", "r2", "memory"); \
else if (sizeof (*(mem)) == 4) \
__asm __volatile ("\
mova 1f,r0\n\
.align 2\n\
mov r15,r1\n\
mov #(0f-1f),r15\n\
0: mov.l @%2,%0\n\
mov %1,r2\n\
add %0,r2\n\
mov.l r2,@%2\n\
1: mov r1,r15"\
: "=&r" (__result), "=&r" (__tmp) : "u" (mem), "1" (__value) \
: "r0", "r1", "r2", "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 ("\
mova 1f,r0\n\
mov r15,r1\n\
.align 2\n\
mov #(0f-1f),r15\n\
0: mov.b @%1,r2\n\
add %0,r2\n\
mov.b r2,@%1\n\
1: mov r1,r15"\
: "=&r" (__tmp) : "u" (mem), "0" (__value) \
: "r0", "r1", "r2", "memory"); \
else if (sizeof (*(mem)) == 2) \
__asm __volatile ("\
mova 1f,r0\n\
mov r15,r1\n\
.align 2\n\
mov #(0f-1f),r15\n\
0: mov.w @%1,r2\n\
add %0,r2\n\
mov.w r2,@%1\n\
1: mov r1,r15"\
: "=&r" (__tmp) : "u" (mem), "0" (__value) \
: "r0", "r1", "r2", "memory"); \
else if (sizeof (*(mem)) == 4) \
__asm __volatile ("\
mova 1f,r0\n\
mov r15,r1\n\
.align 2\n\
mov #(0f-1f),r15\n\
0: mov.l @%1,r2\n\
add %0,r2\n\
mov.l r2,@%1\n\
1: mov r1,r15"\
: "=&r" (__tmp) : "u" (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 ("\
mova 1f,r0\n\
mov r15,r1\n\
.align 2\n\
mov #(0f-1f),r15\n\
0: mov.b @%2,r2\n\
add %1,r2\n\
mov.b r2,@%2\n\
1: mov r1,r15\n\
shal r2\n\
movt %0"\
: "=r" (__result), "=&r" (__tmp) : "u" (mem), "1" (__value) \
: "r0", "r1", "r2", "t", "memory"); \
else if (sizeof (*(mem)) == 2) \
__asm __volatile ("\
mova 1f,r0\n\
mov r15,r1\n\
.align 2\n\
mov #(0f-1f),r15\n\
0: mov.w @%2,r2\n\
add %1,r2\n\
mov.w r2,@%2\n\
1: mov r1,r15\n\
shal r2\n\
movt %0"\
: "=r" (__result), "=&r" (__tmp) : "u" (mem), "1" (__value) \
: "r0", "r1", "r2", "t", "memory"); \
else if (sizeof (*(mem)) == 4) \
__asm __volatile ("\
mova 1f,r0\n\
mov r15,r1\n\
.align 2\n\
mov #(0f-1f),r15\n\
0: mov.l @%2,r2\n\
add %1,r2\n\
mov.l r2,@%2\n\
1: mov r1,r15\n\
shal r2\n\
movt %0"\
: "=r" (__result), "=&r" (__tmp) : "u" (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 ("\
mova 1f,r0\n\
mov r15,r1\n\
.align 2\n\
mov #(0f-1f),r15\n\
0: mov.b @%2,r2\n\
add %1,r2\n\
mov.b r2,@%2\n\
1: mov r1,r15\n\
tst r2,r2\n\
movt %0"\
: "=r" (__result), "=&r" (__tmp) : "u" (mem), "1" (__value) \
: "r0", "r1", "r2", "t", "memory"); \
else if (sizeof (*(mem)) == 2) \
__asm __volatile ("\
mova 1f,r0\n\
mov r15,r1\n\
.align 2\n\
mov #(0f-1f),r15\n\
0: mov.w @%2,r2\n\
add %1,r2\n\
mov.w r2,@%2\n\
1: mov r1,r15\n\
tst r2,r2\n\
movt %0"\
: "=r" (__result), "=&r" (__tmp) : "u" (mem), "1" (__value) \
: "r0", "r1", "r2", "t", "memory"); \
else if (sizeof (*(mem)) == 4) \
__asm __volatile ("\
mova 1f,r0\n\
mov r15,r1\n\
.align 2\n\
mov #(0f-1f),r15\n\
0: mov.l @%2,r2\n\
add %1,r2\n\
mov.l r2,@%2\n\
1: mov r1,r15\n\
tst r2,r2\n\
movt %0"\
: "=r" (__result), "=&r" (__tmp) : "u" (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 ("\
mova 1f,r0\n\
mov r15,r1\n\
.align 2\n\
mov #(0f-1f),r15\n\
0: mov.b @%0,r2\n\
or %1,r2\n\
mov.b r2,@%0\n\
1: mov r1,r15"\
: : "u" (mem), "u" (__mask) \
: "r0", "r1", "r2", "memory"); \
else if (sizeof (*(mem)) == 2) \
__asm __volatile ("\
mova 1f,r0\n\
mov r15,r1\n\
.align 2\n\
mov #(0f-1f),r15\n\
0: mov.w @%0,r2\n\
or %1,r2\n\
mov.w r2,@%0\n\
1: mov r1,r15"\
: : "u" (mem), "u" (__mask) \
: "r0", "r1", "r2", "memory"); \
else if (sizeof (*(mem)) == 4) \
__asm __volatile ("\
mova 1f,r0\n\
mov r15,r1\n\
.align 2\n\
mov #(0f-1f),r15\n\
0: mov.l @%0,r2\n\
or %1,r2\n\
mov.l r2,@%0\n\
1: mov r1,r15"\
: : "u" (mem), "u" (__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 ("\
mova 1f,r0\n\
.align 2\n\
mov r15,r1\n\
mov #(0f-1f),r15\n\
0: mov.b @%2,r2\n\
mov r2,r3\n\
or %1,r2\n\
mov.b r2,@%2\n\
1: mov r1,r15\n\
and r3,%0"\
: "=&r" (__result), "=&r" (__mask) \
: "u" (mem), "0" (__result), "1" (__mask) \
: "r0", "r1", "r2", "r3", "memory"); \
else if (sizeof (*(mem)) == 2) \
__asm __volatile ("\
mova 1f,r0\n\
.align 2\n\
mov r15,r1\n\
mov #(0f-1f),r15\n\
0: mov.w @%2,r2\n\
mov r2,r3\n\
or %1,r2\n\
mov.w %1,@%2\n\
1: mov r1,r15\n\
and r3,%0"\
: "=&r" (__result), "=&r" (__mask) \
: "u" (mem), "0" (__result), "1" (__mask) \
: "r0", "r1", "r2", "r3", "memory"); \
else if (sizeof (*(mem)) == 4) \
__asm __volatile ("\
mova 1f,r0\n\
.align 2\n\
mov r15,r1\n\
mov #(0f-1f),r15\n\
0: mov.l @%2,r2\n\
mov r2,r3\n\
or r2,%1\n\
mov.l %1,@%2\n\
1: mov r1,r15\n\
and r3,%0"\
: "=&r" (__result), "=&r" (__mask) \
: "u" (mem), "0" (__result), "1" (__mask) \
: "r0", "r1", "r2", "r3", "memory"); \
else \
abort (); \
__result; })
|
