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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 | /* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright IBM Corp. 1999, 2011 * * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>, */ #ifndef __ASM_CMPXCHG_H #define __ASM_CMPXCHG_H #include <linux/mmdebug.h> #include <linux/types.h> #include <linux/bug.h> void __xchg_called_with_bad_pointer(void); static __always_inline unsigned long __arch_xchg(unsigned long x, unsigned long address, int size) { unsigned long old; int shift; switch (size) { case 1: shift = (3 ^ (address & 3)) << 3; address ^= address & 3; asm volatile( " l %0,%1\n" "0: lr 0,%0\n" " nr 0,%3\n" " or 0,%2\n" " cs %0,0,%1\n" " jl 0b\n" : "=&d" (old), "+Q" (*(int *) address) : "d" ((x & 0xff) << shift), "d" (~(0xff << shift)) : "memory", "cc", "0"); return old >> shift; case 2: shift = (2 ^ (address & 2)) << 3; address ^= address & 2; asm volatile( " l %0,%1\n" "0: lr 0,%0\n" " nr 0,%3\n" " or 0,%2\n" " cs %0,0,%1\n" " jl 0b\n" : "=&d" (old), "+Q" (*(int *) address) : "d" ((x & 0xffff) << shift), "d" (~(0xffff << shift)) : "memory", "cc", "0"); return old >> shift; case 4: asm volatile( " l %0,%1\n" "0: cs %0,%2,%1\n" " jl 0b\n" : "=&d" (old), "+Q" (*(int *) address) : "d" (x) : "memory", "cc"); return old; case 8: asm volatile( " lg %0,%1\n" "0: csg %0,%2,%1\n" " jl 0b\n" : "=&d" (old), "+QS" (*(long *) address) : "d" (x) : "memory", "cc"); return old; } __xchg_called_with_bad_pointer(); return x; } #define arch_xchg(ptr, x) \ ({ \ __typeof__(*(ptr)) __ret; \ \ __ret = (__typeof__(*(ptr))) \ __arch_xchg((unsigned long)(x), (unsigned long)(ptr), \ sizeof(*(ptr))); \ __ret; \ }) void __cmpxchg_called_with_bad_pointer(void); static __always_inline unsigned long __cmpxchg(unsigned long address, unsigned long old, unsigned long new, int size) { switch (size) { case 1: { unsigned int prev, shift, mask; shift = (3 ^ (address & 3)) << 3; address ^= address & 3; old = (old & 0xff) << shift; new = (new & 0xff) << shift; mask = ~(0xff << shift); asm volatile( " l %[prev],%[address]\n" " nr %[prev],%[mask]\n" " xilf %[mask],0xffffffff\n" " or %[new],%[prev]\n" " or %[prev],%[tmp]\n" "0: lr %[tmp],%[prev]\n" " cs %[prev],%[new],%[address]\n" " jnl 1f\n" " xr %[tmp],%[prev]\n" " xr %[new],%[tmp]\n" " nr %[tmp],%[mask]\n" " jz 0b\n" "1:" : [prev] "=&d" (prev), [address] "+Q" (*(int *)address), [tmp] "+&d" (old), [new] "+&d" (new), [mask] "+&d" (mask) :: "memory", "cc"); return prev >> shift; } case 2: { unsigned int prev, shift, mask; shift = (2 ^ (address & 2)) << 3; address ^= address & 2; old = (old & 0xffff) << shift; new = (new & 0xffff) << shift; mask = ~(0xffff << shift); asm volatile( " l %[prev],%[address]\n" " nr %[prev],%[mask]\n" " xilf %[mask],0xffffffff\n" " or %[new],%[prev]\n" " or %[prev],%[tmp]\n" "0: lr %[tmp],%[prev]\n" " cs %[prev],%[new],%[address]\n" " jnl 1f\n" " xr %[tmp],%[prev]\n" " xr %[new],%[tmp]\n" " nr %[tmp],%[mask]\n" " jz 0b\n" "1:" : [prev] "=&d" (prev), [address] "+Q" (*(int *)address), [tmp] "+&d" (old), [new] "+&d" (new), [mask] "+&d" (mask) :: "memory", "cc"); return prev >> shift; } case 4: { unsigned int prev = old; asm volatile( " cs %[prev],%[new],%[address]\n" : [prev] "+&d" (prev), [address] "+Q" (*(int *)address) : [new] "d" (new) : "memory", "cc"); return prev; } case 8: { unsigned long prev = old; asm volatile( " csg %[prev],%[new],%[address]\n" : [prev] "+&d" (prev), [address] "+QS" (*(long *)address) : [new] "d" (new) : "memory", "cc"); return prev; } } __cmpxchg_called_with_bad_pointer(); return old; } #define arch_cmpxchg(ptr, o, n) \ ({ \ __typeof__(*(ptr)) __ret; \ \ __ret = (__typeof__(*(ptr))) \ __cmpxchg((unsigned long)(ptr), (unsigned long)(o), \ (unsigned long)(n), sizeof(*(ptr))); \ __ret; \ }) #define arch_cmpxchg64 arch_cmpxchg #define arch_cmpxchg_local arch_cmpxchg #define arch_cmpxchg64_local arch_cmpxchg #define system_has_cmpxchg128() 1 static __always_inline u128 arch_cmpxchg128(volatile u128 *ptr, u128 old, u128 new) { asm volatile( " cdsg %[old],%[new],%[ptr]\n" : [old] "+d" (old), [ptr] "+QS" (*ptr) : [new] "d" (new) : "memory", "cc"); return old; } #define arch_cmpxchg128 arch_cmpxchg128 #endif /* __ASM_CMPXCHG_H */ |