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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 | /* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Copyright (C) 2002 Paul Mackerras, IBM Corp. */ #include <linux/export.h> #include <asm/processor.h> #include <asm/ppc_asm.h> #include <asm/asm-compat.h> #include <asm/feature-fixups.h> #include <asm/kasan.h> #ifndef SELFTEST_CASE /* For big-endian, 0 == most CPUs, 1 == POWER6, 2 == Cell */ #define SELFTEST_CASE 0 #endif .align 7 _GLOBAL_TOC_KASAN(memcpy) BEGIN_FTR_SECTION #ifdef __LITTLE_ENDIAN__ cmpdi cr7,r5,0 #else std r3,-STACKFRAMESIZE+STK_REG(R31)(r1) /* save destination pointer for return value */ #endif FTR_SECTION_ELSE #ifdef CONFIG_PPC_BOOK3S_64 b memcpy_power7 #endif ALT_FTR_SECTION_END_IFCLR(CPU_FTR_VMX_COPY) #ifdef __LITTLE_ENDIAN__ /* dumb little-endian memcpy that will get replaced at runtime */ addi r9,r3,-1 addi r4,r4,-1 beqlr cr7 mtctr r5 1: lbzu r10,1(r4) stbu r10,1(r9) bdnz 1b blr #else PPC_MTOCRF(0x01,r5) cmpldi cr1,r5,16 neg r6,r3 # LS 3 bits = # bytes to 8-byte dest bdry andi. r6,r6,7 dcbt 0,r4 blt cr1,.Lshort_copy /* Below we want to nop out the bne if we're on a CPU that has the CPU_FTR_UNALIGNED_LD_STD bit set and the CPU_FTR_CP_USE_DCBTZ bit cleared. At the time of writing the only CPU that has this combination of bits set is Power6. */ test_feature = (SELFTEST_CASE == 1) BEGIN_FTR_SECTION nop FTR_SECTION_ELSE bne .Ldst_unaligned ALT_FTR_SECTION_END(CPU_FTR_UNALIGNED_LD_STD | CPU_FTR_CP_USE_DCBTZ, \ CPU_FTR_UNALIGNED_LD_STD) .Ldst_aligned: addi r3,r3,-16 test_feature = (SELFTEST_CASE == 0) BEGIN_FTR_SECTION andi. r0,r4,7 bne .Lsrc_unaligned END_FTR_SECTION_IFCLR(CPU_FTR_UNALIGNED_LD_STD) srdi r7,r5,4 ld r9,0(r4) addi r4,r4,-8 mtctr r7 andi. r5,r5,7 bf cr7*4+0,2f addi r3,r3,8 addi r4,r4,8 mr r8,r9 blt cr1,3f 1: ld r9,8(r4) std r8,8(r3) 2: ldu r8,16(r4) stdu r9,16(r3) bdnz 1b 3: std r8,8(r3) beq 3f addi r3,r3,16 .Ldo_tail: bf cr7*4+1,1f lwz r9,8(r4) addi r4,r4,4 stw r9,0(r3) addi r3,r3,4 1: bf cr7*4+2,2f lhz r9,8(r4) addi r4,r4,2 sth r9,0(r3) addi r3,r3,2 2: bf cr7*4+3,3f lbz r9,8(r4) stb r9,0(r3) 3: ld r3,-STACKFRAMESIZE+STK_REG(R31)(r1) /* return dest pointer */ blr .Lsrc_unaligned: srdi r6,r5,3 addi r5,r5,-16 subf r4,r0,r4 srdi r7,r5,4 sldi r10,r0,3 cmpdi cr6,r6,3 andi. r5,r5,7 mtctr r7 subfic r11,r10,64 add r5,r5,r0 bt cr7*4+0,0f ld r9,0(r4) # 3+2n loads, 2+2n stores ld r0,8(r4) sld r6,r9,r10 ldu r9,16(r4) srd r7,r0,r11 sld r8,r0,r10 or r7,r7,r6 blt cr6,4f ld r0,8(r4) # s1<< in r8, d0=(s0<<|s1>>) in r7, s3 in r0, s2 in r9, nix in r6 & r12 b 2f 0: ld r0,0(r4) # 4+2n loads, 3+2n stores ldu r9,8(r4) sld r8,r0,r10 addi r3,r3,-8 blt cr6,5f ld r0,8(r4) srd r12,r9,r11 sld r6,r9,r10 ldu r9,16(r4) or r12,r8,r12 srd r7,r0,r11 sld r8,r0,r10 addi r3,r3,16 beq cr6,3f # d0=(s0<<|s1>>) in r12, s1<< in r6, s2>> in r7, s2<< in r8, s3 in r9 1: or r7,r7,r6 ld r0,8(r4) std r12,8(r3) 2: srd r12,r9,r11 sld r6,r9,r10 ldu r9,16(r4) or r12,r8,r12 stdu r7,16(r3) srd r7,r0,r11 sld r8,r0,r10 bdnz 1b 3: std r12,8(r3) or r7,r7,r6 4: std r7,16(r3) 5: srd r12,r9,r11 or r12,r8,r12 std r12,24(r3) beq 4f cmpwi cr1,r5,8 addi r3,r3,32 sld r9,r9,r10 ble cr1,6f ld r0,8(r4) srd r7,r0,r11 or r9,r7,r9 6: bf cr7*4+1,1f rotldi r9,r9,32 stw r9,0(r3) addi r3,r3,4 1: bf cr7*4+2,2f rotldi r9,r9,16 sth r9,0(r3) addi r3,r3,2 2: bf cr7*4+3,3f rotldi r9,r9,8 stb r9,0(r3) 3: ld r3,-STACKFRAMESIZE+STK_REG(R31)(r1) /* return dest pointer */ blr .Ldst_unaligned: PPC_MTOCRF(0x01,r6) # put #bytes to 8B bdry into cr7 subf r5,r6,r5 li r7,0 cmpldi cr1,r5,16 bf cr7*4+3,1f lbz r0,0(r4) stb r0,0(r3) addi r7,r7,1 1: bf cr7*4+2,2f lhzx r0,r7,r4 sthx r0,r7,r3 addi r7,r7,2 2: bf cr7*4+1,3f lwzx r0,r7,r4 stwx r0,r7,r3 3: PPC_MTOCRF(0x01,r5) add r4,r6,r4 add r3,r6,r3 b .Ldst_aligned .Lshort_copy: bf cr7*4+0,1f lwz r0,0(r4) lwz r9,4(r4) addi r4,r4,8 stw r0,0(r3) stw r9,4(r3) addi r3,r3,8 1: bf cr7*4+1,2f lwz r0,0(r4) addi r4,r4,4 stw r0,0(r3) addi r3,r3,4 2: bf cr7*4+2,3f lhz r0,0(r4) addi r4,r4,2 sth r0,0(r3) addi r3,r3,2 3: bf cr7*4+3,4f lbz r0,0(r4) stb r0,0(r3) 4: ld r3,-STACKFRAMESIZE+STK_REG(R31)(r1) /* return dest pointer */ blr #endif EXPORT_SYMBOL(memcpy) EXPORT_SYMBOL_KASAN(memcpy) |