mirror of
https://github.com/autc04/Retro68.git
synced 2024-09-08 20:55:01 +00:00
212 lines
7.2 KiB
C
212 lines
7.2 KiB
C
/* Linux-specific atomic operations for m68k Linux.
|
|
Copyright (C) 2011-2016 Free Software Foundation, Inc.
|
|
Based on code contributed by CodeSourcery for ARM EABI Linux.
|
|
|
|
This file is part of GCC.
|
|
|
|
GCC is free software; you can redistribute it and/or modify it under
|
|
the terms of the GNU General Public License as published by the Free
|
|
Software Foundation; either version 3, or (at your option) any later
|
|
version.
|
|
|
|
GCC 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 General Public License
|
|
for more details.
|
|
|
|
Under Section 7 of GPL version 3, you are granted additional
|
|
permissions described in the GCC Runtime Library Exception, version
|
|
3.1, as published by the Free Software Foundation.
|
|
|
|
You should have received a copy of the GNU General Public License and
|
|
a copy of the GCC Runtime Library Exception along with this program;
|
|
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
/* Coldfire dropped the CAS instruction from the base M68K ISA.
|
|
|
|
GCC automatically issues a asm memory barrier when it encounters
|
|
a __sync_synchronize builtin. Thus, we do not need to define this
|
|
builtin.
|
|
|
|
We implement byte, short and int versions of each atomic operation
|
|
using the kernel helper defined below. There is no support for
|
|
64-bit operations yet. */
|
|
|
|
#include <asm/unistd.h>
|
|
#include <stdbool.h>
|
|
|
|
#ifndef __NR_atomic_cmpxchg_32
|
|
#define __NR_atomic_cmpxchg_32 335
|
|
#endif
|
|
|
|
/* Kernel helper for compare-and-exchange a 32-bit value. */
|
|
static inline unsigned
|
|
__kernel_cmpxchg (unsigned *mem, unsigned oldval, unsigned newval)
|
|
{
|
|
register unsigned *a0 asm("a0") = mem;
|
|
register unsigned d2 asm("d2") = oldval;
|
|
register unsigned d1 asm("d1") = newval;
|
|
register unsigned d0 asm("d0") = __NR_atomic_cmpxchg_32;
|
|
|
|
asm volatile ("trap #0"
|
|
: "=r"(d0), "=r"(d1), "=r"(a0)
|
|
: "r"(d0), "r"(d1), "r"(d2), "r"(a0)
|
|
: "memory", "a1");
|
|
|
|
return d0;
|
|
}
|
|
|
|
#define HIDDEN __attribute__ ((visibility ("hidden")))
|
|
|
|
/* Big endian masks */
|
|
#define INVERT_MASK_1 24
|
|
#define INVERT_MASK_2 16
|
|
|
|
#define MASK_1 0xffu
|
|
#define MASK_2 0xffffu
|
|
|
|
#define NAME_oldval(OP, WIDTH) __sync_fetch_and_##OP##_##WIDTH
|
|
#define NAME_newval(OP, WIDTH) __sync_##OP##_and_fetch_##WIDTH
|
|
|
|
#define WORD_SYNC_OP(OP, PFX_OP, INF_OP, RETURN) \
|
|
unsigned HIDDEN \
|
|
NAME##_##RETURN (OP, 4) (unsigned *ptr, unsigned val) \
|
|
{ \
|
|
unsigned oldval, newval, cmpval = *ptr; \
|
|
\
|
|
do { \
|
|
oldval = cmpval; \
|
|
newval = PFX_OP (oldval INF_OP val); \
|
|
cmpval = __kernel_cmpxchg (ptr, oldval, newval); \
|
|
} while (__builtin_expect (oldval != cmpval, 0)); \
|
|
\
|
|
return RETURN; \
|
|
}
|
|
|
|
#define SUBWORD_SYNC_OP(OP, PFX_OP, INF_OP, TYPE, WIDTH, RETURN) \
|
|
TYPE HIDDEN \
|
|
NAME##_##RETURN (OP, WIDTH) (TYPE *ptr, TYPE sval) \
|
|
{ \
|
|
unsigned *wordptr = (unsigned *) ((unsigned long) ptr & ~3); \
|
|
unsigned int mask, shift, oldval, newval, cmpval, wval; \
|
|
\
|
|
shift = (((unsigned long) ptr & 3) << 3) ^ INVERT_MASK_##WIDTH; \
|
|
mask = MASK_##WIDTH << shift; \
|
|
wval = (sval & MASK_##WIDTH) << shift; \
|
|
\
|
|
cmpval = *wordptr; \
|
|
do { \
|
|
oldval = cmpval; \
|
|
newval = PFX_OP (oldval INF_OP wval); \
|
|
newval = (newval & mask) | (oldval & ~mask); \
|
|
cmpval = __kernel_cmpxchg (wordptr, oldval, newval); \
|
|
} while (__builtin_expect (oldval != cmpval, 0)); \
|
|
\
|
|
return (RETURN >> shift) & MASK_##WIDTH; \
|
|
}
|
|
|
|
WORD_SYNC_OP (add, , +, oldval)
|
|
WORD_SYNC_OP (sub, , -, oldval)
|
|
WORD_SYNC_OP (or, , |, oldval)
|
|
WORD_SYNC_OP (and, , &, oldval)
|
|
WORD_SYNC_OP (xor, , ^, oldval)
|
|
WORD_SYNC_OP (nand, ~, &, oldval)
|
|
|
|
SUBWORD_SYNC_OP (add, , +, unsigned short, 2, oldval)
|
|
SUBWORD_SYNC_OP (sub, , -, unsigned short, 2, oldval)
|
|
SUBWORD_SYNC_OP (or, , |, unsigned short, 2, oldval)
|
|
SUBWORD_SYNC_OP (and, , &, unsigned short, 2, oldval)
|
|
SUBWORD_SYNC_OP (xor, , ^, unsigned short, 2, oldval)
|
|
SUBWORD_SYNC_OP (nand, ~, &, unsigned short, 2, oldval)
|
|
|
|
SUBWORD_SYNC_OP (add, , +, unsigned char, 1, oldval)
|
|
SUBWORD_SYNC_OP (sub, , -, unsigned char, 1, oldval)
|
|
SUBWORD_SYNC_OP (or, , |, unsigned char, 1, oldval)
|
|
SUBWORD_SYNC_OP (and, , &, unsigned char, 1, oldval)
|
|
SUBWORD_SYNC_OP (xor, , ^, unsigned char, 1, oldval)
|
|
SUBWORD_SYNC_OP (nand, ~, &, unsigned char, 1, oldval)
|
|
|
|
WORD_SYNC_OP (add, , +, newval)
|
|
WORD_SYNC_OP (sub, , -, newval)
|
|
WORD_SYNC_OP (or, , |, newval)
|
|
WORD_SYNC_OP (and, , &, newval)
|
|
WORD_SYNC_OP (xor, , ^, newval)
|
|
WORD_SYNC_OP (nand, ~, &, newval)
|
|
|
|
SUBWORD_SYNC_OP (add, , +, unsigned short, 2, newval)
|
|
SUBWORD_SYNC_OP (sub, , -, unsigned short, 2, newval)
|
|
SUBWORD_SYNC_OP (or, , |, unsigned short, 2, newval)
|
|
SUBWORD_SYNC_OP (and, , &, unsigned short, 2, newval)
|
|
SUBWORD_SYNC_OP (xor, , ^, unsigned short, 2, newval)
|
|
SUBWORD_SYNC_OP (nand, ~, &, unsigned short, 2, newval)
|
|
|
|
SUBWORD_SYNC_OP (add, , +, unsigned char, 1, newval)
|
|
SUBWORD_SYNC_OP (sub, , -, unsigned char, 1, newval)
|
|
SUBWORD_SYNC_OP (or, , |, unsigned char, 1, newval)
|
|
SUBWORD_SYNC_OP (and, , &, unsigned char, 1, newval)
|
|
SUBWORD_SYNC_OP (xor, , ^, unsigned char, 1, newval)
|
|
SUBWORD_SYNC_OP (nand, ~, &, unsigned char, 1, newval)
|
|
|
|
unsigned HIDDEN
|
|
__sync_val_compare_and_swap_4 (unsigned *ptr, unsigned oldval, unsigned newval)
|
|
{
|
|
return __kernel_cmpxchg (ptr, oldval, newval);
|
|
}
|
|
|
|
bool HIDDEN
|
|
__sync_bool_compare_and_swap_4 (unsigned *ptr, unsigned oldval,
|
|
unsigned newval)
|
|
{
|
|
return __kernel_cmpxchg (ptr, oldval, newval) == oldval;
|
|
}
|
|
|
|
#define SUBWORD_VAL_CAS(TYPE, WIDTH) \
|
|
TYPE HIDDEN \
|
|
__sync_val_compare_and_swap_##WIDTH (TYPE *ptr, TYPE soldval, \
|
|
TYPE snewval) \
|
|
{ \
|
|
unsigned *wordptr = (unsigned *)((unsigned long) ptr & ~3); \
|
|
unsigned int mask, shift, woldval, wnewval; \
|
|
unsigned oldval, newval, cmpval; \
|
|
\
|
|
shift = (((unsigned long) ptr & 3) << 3) ^ INVERT_MASK_##WIDTH; \
|
|
mask = MASK_##WIDTH << shift; \
|
|
woldval = (soldval & MASK_##WIDTH) << shift; \
|
|
wnewval = (snewval & MASK_##WIDTH) << shift; \
|
|
cmpval = *wordptr; \
|
|
\
|
|
do { \
|
|
oldval = cmpval; \
|
|
if ((oldval & mask) != woldval) \
|
|
break; \
|
|
newval = (oldval & ~mask) | wnewval; \
|
|
cmpval = __kernel_cmpxchg (wordptr, oldval, newval); \
|
|
} while (__builtin_expect (oldval != cmpval, 0)); \
|
|
\
|
|
return (oldval >> shift) & MASK_##WIDTH; \
|
|
}
|
|
|
|
SUBWORD_VAL_CAS (unsigned short, 2)
|
|
SUBWORD_VAL_CAS (unsigned char, 1)
|
|
|
|
#define SUBWORD_BOOL_CAS(TYPE, WIDTH) \
|
|
bool HIDDEN \
|
|
__sync_bool_compare_and_swap_##WIDTH (TYPE *ptr, TYPE oldval, \
|
|
TYPE newval) \
|
|
{ \
|
|
return (__sync_val_compare_and_swap_##WIDTH (ptr, oldval, newval) \
|
|
== oldval); \
|
|
}
|
|
|
|
SUBWORD_BOOL_CAS (unsigned short, 2)
|
|
SUBWORD_BOOL_CAS (unsigned char, 1)
|
|
|
|
#undef NAME_oldval
|
|
#define NAME_oldval(OP, WIDTH) __sync_lock_##OP##_##WIDTH
|
|
#define COMMA ,
|
|
|
|
WORD_SYNC_OP (test_and_set, , COMMA, oldval)
|
|
SUBWORD_SYNC_OP (test_and_set, , COMMA, unsigned char, 1, oldval)
|
|
SUBWORD_SYNC_OP (test_and_set, , COMMA, unsigned short, 2, oldval)
|