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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 | /* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 1998, 1999, 2000 by Ralf Baechle * Copyright (C) 1999, 2000 Silicon Graphics, Inc. * Copyright (C) 2007 by Maciej W. Rozycki * Copyright (C) 2011, 2012 MIPS Technologies, Inc. */ #include <asm/asm.h> #include <asm/asm-offsets.h> #include <asm/export.h> #include <asm/regdef.h> #if LONGSIZE == 4 #define LONG_S_L swl #define LONG_S_R swr #else #define LONG_S_L sdl #define LONG_S_R sdr #endif #ifdef CONFIG_CPU_MICROMIPS #define STORSIZE (LONGSIZE * 2) #define STORMASK (STORSIZE - 1) #define FILL64RG t8 #define FILLPTRG t7 #undef LONG_S #define LONG_S LONG_SP #else #define STORSIZE LONGSIZE #define STORMASK LONGMASK #define FILL64RG a1 #define FILLPTRG t0 #endif #define LEGACY_MODE 1 #define EVA_MODE 2 /* * No need to protect it with EVA #ifdefery. The generated block of code * will never be assembled if EVA is not enabled. */ #define __EVAFY(insn, reg, addr) __BUILD_EVA_INSN(insn##e, reg, addr) #define ___BUILD_EVA_INSN(insn, reg, addr) __EVAFY(insn, reg, addr) #define EX(insn,reg,addr,handler) \ .if \mode == LEGACY_MODE; \ 9: insn reg, addr; \ .else; \ 9: ___BUILD_EVA_INSN(insn, reg, addr); \ .endif; \ .section __ex_table,"a"; \ PTR_WD 9b, handler; \ .previous .macro f_fill64 dst, offset, val, fixup, mode EX(LONG_S, \val, (\offset + 0 * STORSIZE)(\dst), \fixup) EX(LONG_S, \val, (\offset + 1 * STORSIZE)(\dst), \fixup) EX(LONG_S, \val, (\offset + 2 * STORSIZE)(\dst), \fixup) EX(LONG_S, \val, (\offset + 3 * STORSIZE)(\dst), \fixup) #if ((defined(CONFIG_CPU_MICROMIPS) && (LONGSIZE == 4)) || !defined(CONFIG_CPU_MICROMIPS)) EX(LONG_S, \val, (\offset + 4 * STORSIZE)(\dst), \fixup) EX(LONG_S, \val, (\offset + 5 * STORSIZE)(\dst), \fixup) EX(LONG_S, \val, (\offset + 6 * STORSIZE)(\dst), \fixup) EX(LONG_S, \val, (\offset + 7 * STORSIZE)(\dst), \fixup) #endif #if (!defined(CONFIG_CPU_MICROMIPS) && (LONGSIZE == 4)) EX(LONG_S, \val, (\offset + 8 * STORSIZE)(\dst), \fixup) EX(LONG_S, \val, (\offset + 9 * STORSIZE)(\dst), \fixup) EX(LONG_S, \val, (\offset + 10 * STORSIZE)(\dst), \fixup) EX(LONG_S, \val, (\offset + 11 * STORSIZE)(\dst), \fixup) EX(LONG_S, \val, (\offset + 12 * STORSIZE)(\dst), \fixup) EX(LONG_S, \val, (\offset + 13 * STORSIZE)(\dst), \fixup) EX(LONG_S, \val, (\offset + 14 * STORSIZE)(\dst), \fixup) EX(LONG_S, \val, (\offset + 15 * STORSIZE)(\dst), \fixup) #endif .endm .align 5 /* * Macro to generate the __bzero{,_user} symbol * Arguments: * mode: LEGACY_MODE or EVA_MODE */ .macro __BUILD_BZERO mode /* Initialize __memset if this is the first time we call this macro */ .ifnotdef __memset .set __memset, 1 .hidden __memset /* Make sure it does not leak */ .endif sltiu t0, a2, STORSIZE /* very small region? */ .set noreorder bnez t0, .Lsmall_memset\@ andi t0, a0, STORMASK /* aligned? */ .set reorder #ifdef CONFIG_CPU_MICROMIPS move t8, a1 /* used by 'swp' instruction */ move t9, a1 #endif .set noreorder #ifndef CONFIG_CPU_DADDI_WORKAROUNDS beqz t0, 1f PTR_SUBU t0, STORSIZE /* alignment in bytes */ #else .set noat li AT, STORSIZE beqz t0, 1f PTR_SUBU t0, AT /* alignment in bytes */ .set at #endif .set reorder #ifndef CONFIG_CPU_NO_LOAD_STORE_LR R10KCBARRIER(0(ra)) #ifdef __MIPSEB__ EX(LONG_S_L, a1, (a0), .Lfirst_fixup\@) /* make word/dword aligned */ #else EX(LONG_S_R, a1, (a0), .Lfirst_fixup\@) /* make word/dword aligned */ #endif PTR_SUBU a0, t0 /* long align ptr */ PTR_ADDU a2, t0 /* correct size */ #else /* CONFIG_CPU_NO_LOAD_STORE_LR */ #define STORE_BYTE(N) \ EX(sb, a1, N(a0), .Lbyte_fixup\@); \ .set noreorder; \ beqz t0, 0f; \ PTR_ADDU t0, 1; \ .set reorder; PTR_ADDU a2, t0 /* correct size */ PTR_ADDU t0, 1 STORE_BYTE(0) STORE_BYTE(1) #if LONGSIZE == 4 EX(sb, a1, 2(a0), .Lbyte_fixup\@) #else STORE_BYTE(2) STORE_BYTE(3) STORE_BYTE(4) STORE_BYTE(5) EX(sb, a1, 6(a0), .Lbyte_fixup\@) #endif 0: ori a0, STORMASK xori a0, STORMASK PTR_ADDIU a0, STORSIZE #endif /* CONFIG_CPU_NO_LOAD_STORE_LR */ 1: ori t1, a2, 0x3f /* # of full blocks */ xori t1, 0x3f andi t0, a2, 0x40-STORSIZE beqz t1, .Lmemset_partial\@ /* no block to fill */ PTR_ADDU t1, a0 /* end address */ 1: PTR_ADDIU a0, 64 R10KCBARRIER(0(ra)) f_fill64 a0, -64, FILL64RG, .Lfwd_fixup\@, \mode bne t1, a0, 1b .Lmemset_partial\@: R10KCBARRIER(0(ra)) PTR_LA t1, 2f /* where to start */ #ifdef CONFIG_CPU_MICROMIPS LONG_SRL t7, t0, 1 #endif #if LONGSIZE == 4 PTR_SUBU t1, FILLPTRG #else .set noat LONG_SRL AT, FILLPTRG, 1 PTR_SUBU t1, AT .set at #endif PTR_ADDU a0, t0 /* dest ptr */ jr t1 /* ... but first do longs ... */ f_fill64 a0, -64, FILL64RG, .Lpartial_fixup\@, \mode 2: andi a2, STORMASK /* At most one long to go */ .set noreorder beqz a2, 1f #ifndef CONFIG_CPU_NO_LOAD_STORE_LR PTR_ADDU a0, a2 /* What's left */ .set reorder R10KCBARRIER(0(ra)) #ifdef __MIPSEB__ EX(LONG_S_R, a1, -1(a0), .Llast_fixup\@) #else EX(LONG_S_L, a1, -1(a0), .Llast_fixup\@) #endif #else /* CONFIG_CPU_NO_LOAD_STORE_LR */ PTR_SUBU t0, $0, a2 .set reorder move a2, zero /* No remaining longs */ PTR_ADDIU t0, 1 STORE_BYTE(0) STORE_BYTE(1) #if LONGSIZE == 4 EX(sb, a1, 2(a0), .Lbyte_fixup\@) #else STORE_BYTE(2) STORE_BYTE(3) STORE_BYTE(4) STORE_BYTE(5) EX(sb, a1, 6(a0), .Lbyte_fixup\@) #endif 0: #endif /* CONFIG_CPU_NO_LOAD_STORE_LR */ 1: move a2, zero jr ra .Lsmall_memset\@: PTR_ADDU t1, a0, a2 beqz a2, 2f 1: PTR_ADDIU a0, 1 /* fill bytewise */ R10KCBARRIER(0(ra)) .set noreorder bne t1, a0, 1b EX(sb, a1, -1(a0), .Lsmall_fixup\@) .set reorder 2: move a2, zero jr ra /* done */ .if __memset == 1 END(memset) .set __memset, 0 .hidden __memset .endif #ifdef CONFIG_CPU_NO_LOAD_STORE_LR .Lbyte_fixup\@: /* * unset_bytes = (#bytes - (#unaligned bytes)) - (-#unaligned bytes remaining + 1) + 1 * a2 = a2 - t0 + 1 */ PTR_SUBU a2, t0 PTR_ADDIU a2, 1 jr ra #endif /* CONFIG_CPU_NO_LOAD_STORE_LR */ .Lfirst_fixup\@: /* unset_bytes already in a2 */ jr ra .Lfwd_fixup\@: /* * unset_bytes = partial_start_addr + #bytes - fault_addr * a2 = t1 + (a2 & 3f) - $28->task->BUADDR */ PTR_L t0, TI_TASK($28) andi a2, 0x3f LONG_L t0, THREAD_BUADDR(t0) LONG_ADDU a2, t1 LONG_SUBU a2, t0 jr ra .Lpartial_fixup\@: /* * unset_bytes = partial_end_addr + #bytes - fault_addr * a2 = a0 + (a2 & STORMASK) - $28->task->BUADDR */ PTR_L t0, TI_TASK($28) andi a2, STORMASK LONG_L t0, THREAD_BUADDR(t0) LONG_ADDU a2, a0 LONG_SUBU a2, t0 jr ra .Llast_fixup\@: /* unset_bytes already in a2 */ jr ra .Lsmall_fixup\@: /* * unset_bytes = end_addr - current_addr + 1 * a2 = t1 - a0 + 1 */ PTR_SUBU a2, t1, a0 PTR_ADDIU a2, 1 jr ra .endm /* * memset(void *s, int c, size_t n) * * a0: start of area to clear * a1: char to fill with * a2: size of area to clear */ LEAF(memset) EXPORT_SYMBOL(memset) move v0, a0 /* result */ beqz a1, 1f andi a1, 0xff /* spread fillword */ LONG_SLL t1, a1, 8 or a1, t1 LONG_SLL t1, a1, 16 #if LONGSIZE == 8 or a1, t1 LONG_SLL t1, a1, 32 #endif or a1, t1 1: #ifndef CONFIG_EVA FEXPORT(__bzero) EXPORT_SYMBOL(__bzero) #endif __BUILD_BZERO LEGACY_MODE #ifdef CONFIG_EVA LEAF(__bzero) EXPORT_SYMBOL(__bzero) __BUILD_BZERO EVA_MODE END(__bzero) #endif |