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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 | /* * 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) 1994, 95, 96, 99, 2001 Ralf Baechle * Copyright (C) 1994, 1995, 1996 Paul M. Antoine. * Copyright (C) 1999 Silicon Graphics, Inc. * Copyright (C) 2007 Maciej W. Rozycki */ #ifndef _ASM_STACKFRAME_H #define _ASM_STACKFRAME_H #include <linux/threads.h> #include <asm/asm.h> #include <asm/asmmacro.h> #include <asm/mipsregs.h> #include <asm/asm-offsets.h> #include <asm/thread_info.h> /* Make the addition of cfi info a little easier. */ .macro cfi_rel_offset reg offset=0 docfi=0 .if \docfi .cfi_rel_offset \reg, \offset .endif .endm .macro cfi_st reg offset=0 docfi=0 LONG_S \reg, \offset(sp) cfi_rel_offset \reg, \offset, \docfi .endm .macro cfi_restore reg offset=0 docfi=0 .if \docfi .cfi_restore \reg .endif .endm .macro cfi_ld reg offset=0 docfi=0 LONG_L \reg, \offset(sp) cfi_restore \reg \offset \docfi .endm #if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX) #define STATMASK 0x3f #else #define STATMASK 0x1f #endif .macro SAVE_AT docfi=0 .set push .set noat cfi_st $1, PT_R1, \docfi .set pop .endm .macro SAVE_TEMP docfi=0 #ifdef CONFIG_CPU_HAS_SMARTMIPS mflhxu v1 LONG_S v1, PT_LO(sp) mflhxu v1 LONG_S v1, PT_HI(sp) mflhxu v1 LONG_S v1, PT_ACX(sp) #elif !defined(CONFIG_CPU_MIPSR6) mfhi v1 #endif #ifdef CONFIG_32BIT cfi_st $8, PT_R8, \docfi cfi_st $9, PT_R9, \docfi #endif cfi_st $10, PT_R10, \docfi cfi_st $11, PT_R11, \docfi cfi_st $12, PT_R12, \docfi #if !defined(CONFIG_CPU_HAS_SMARTMIPS) && !defined(CONFIG_CPU_MIPSR6) LONG_S v1, PT_HI(sp) mflo v1 #endif cfi_st $13, PT_R13, \docfi cfi_st $14, PT_R14, \docfi cfi_st $15, PT_R15, \docfi cfi_st $24, PT_R24, \docfi #if !defined(CONFIG_CPU_HAS_SMARTMIPS) && !defined(CONFIG_CPU_MIPSR6) LONG_S v1, PT_LO(sp) #endif #ifdef CONFIG_CPU_CAVIUM_OCTEON /* * The Octeon multiplier state is affected by general * multiply instructions. It must be saved before and * kernel code might corrupt it */ jal octeon_mult_save #endif .endm .macro SAVE_STATIC docfi=0 cfi_st $16, PT_R16, \docfi cfi_st $17, PT_R17, \docfi cfi_st $18, PT_R18, \docfi cfi_st $19, PT_R19, \docfi cfi_st $20, PT_R20, \docfi cfi_st $21, PT_R21, \docfi cfi_st $22, PT_R22, \docfi cfi_st $23, PT_R23, \docfi cfi_st $30, PT_R30, \docfi .endm /* * get_saved_sp returns the SP for the current CPU by looking in the * kernelsp array for it. If tosp is set, it stores the current sp in * k0 and loads the new value in sp. If not, it clobbers k0 and * stores the new value in k1, leaving sp unaffected. */ #ifdef CONFIG_SMP /* SMP variation */ .macro get_saved_sp docfi=0 tosp=0 ASM_CPUID_MFC0 k0, ASM_SMP_CPUID_REG #if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32) lui k1, %hi(kernelsp) #else lui k1, %highest(kernelsp) daddiu k1, %higher(kernelsp) dsll k1, 16 daddiu k1, %hi(kernelsp) dsll k1, 16 #endif LONG_SRL k0, SMP_CPUID_PTRSHIFT LONG_ADDU k1, k0 .if \tosp move k0, sp .if \docfi .cfi_register sp, k0 .endif LONG_L sp, %lo(kernelsp)(k1) .else LONG_L k1, %lo(kernelsp)(k1) .endif .endm .macro set_saved_sp stackp temp temp2 ASM_CPUID_MFC0 \temp, ASM_SMP_CPUID_REG LONG_SRL \temp, SMP_CPUID_PTRSHIFT LONG_S \stackp, kernelsp(\temp) .endm #else /* !CONFIG_SMP */ /* Uniprocessor variation */ .macro get_saved_sp docfi=0 tosp=0 #ifdef CONFIG_CPU_JUMP_WORKAROUNDS /* * Clear BTB (branch target buffer), forbid RAS (return address * stack) to workaround the Out-of-order Issue in Loongson2F * via its diagnostic register. */ move k0, ra jal 1f nop 1: jal 1f nop 1: jal 1f nop 1: jal 1f nop 1: move ra, k0 li k0, 3 mtc0 k0, $22 #endif /* CONFIG_CPU_JUMP_WORKAROUNDS */ #if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32) lui k1, %hi(kernelsp) #else lui k1, %highest(kernelsp) daddiu k1, %higher(kernelsp) dsll k1, k1, 16 daddiu k1, %hi(kernelsp) dsll k1, k1, 16 #endif .if \tosp move k0, sp .if \docfi .cfi_register sp, k0 .endif LONG_L sp, %lo(kernelsp)(k1) .else LONG_L k1, %lo(kernelsp)(k1) .endif .endm .macro set_saved_sp stackp temp temp2 LONG_S \stackp, kernelsp .endm #endif .macro SAVE_SOME docfi=0 .set push .set noat .set reorder mfc0 k0, CP0_STATUS sll k0, 3 /* extract cu0 bit */ .set noreorder bltz k0, 8f move k0, sp .if \docfi .cfi_register sp, k0 .endif #ifdef CONFIG_EVA /* * Flush interAptiv's Return Prediction Stack (RPS) by writing * EntryHi. Toggling Config7.RPS is slower and less portable. * * The RPS isn't automatically flushed when exceptions are * taken, which can result in kernel mode speculative accesses * to user addresses if the RPS mispredicts. That's harmless * when user and kernel share the same address space, but with * EVA the same user segments may be unmapped to kernel mode, * even containing sensitive MMIO regions or invalid memory. * * This can happen when the kernel sets the return address to * ret_from_* and jr's to the exception handler, which looks * more like a tail call than a function call. If nested calls * don't evict the last user address in the RPS, it will * mispredict the return and fetch from a user controlled * address into the icache. * * More recent EVA-capable cores with MAAR to restrict * speculative accesses aren't affected. */ MFC0 k0, CP0_ENTRYHI MTC0 k0, CP0_ENTRYHI #endif .set reorder /* Called from user mode, new stack. */ get_saved_sp docfi=\docfi tosp=1 8: #ifdef CONFIG_CPU_DADDI_WORKAROUNDS .set at=k1 #endif PTR_SUBU sp, PT_SIZE #ifdef CONFIG_CPU_DADDI_WORKAROUNDS .set noat #endif .if \docfi .cfi_def_cfa sp,0 .endif cfi_st k0, PT_R29, \docfi cfi_rel_offset sp, PT_R29, \docfi cfi_st v1, PT_R3, \docfi /* * You might think that you don't need to save $0, * but the FPU emulator and gdb remote debug stub * need it to operate correctly */ LONG_S $0, PT_R0(sp) mfc0 v1, CP0_STATUS cfi_st v0, PT_R2, \docfi LONG_S v1, PT_STATUS(sp) cfi_st $4, PT_R4, \docfi mfc0 v1, CP0_CAUSE cfi_st $5, PT_R5, \docfi LONG_S v1, PT_CAUSE(sp) cfi_st $6, PT_R6, \docfi cfi_st ra, PT_R31, \docfi MFC0 ra, CP0_EPC cfi_st $7, PT_R7, \docfi #ifdef CONFIG_64BIT cfi_st $8, PT_R8, \docfi cfi_st $9, PT_R9, \docfi #endif LONG_S ra, PT_EPC(sp) .if \docfi .cfi_rel_offset ra, PT_EPC .endif cfi_st $25, PT_R25, \docfi cfi_st $28, PT_R28, \docfi /* Set thread_info if we're coming from user mode */ mfc0 k0, CP0_STATUS sll k0, 3 /* extract cu0 bit */ bltz k0, 9f ori $28, sp, _THREAD_MASK xori $28, _THREAD_MASK #ifdef CONFIG_CPU_CAVIUM_OCTEON .set mips64 pref 0, 0($28) /* Prefetch the current pointer */ #endif 9: .set pop .endm .macro SAVE_ALL docfi=0 SAVE_SOME \docfi SAVE_AT \docfi SAVE_TEMP \docfi SAVE_STATIC \docfi .endm .macro RESTORE_AT docfi=0 .set push .set noat cfi_ld $1, PT_R1, \docfi .set pop .endm .macro RESTORE_TEMP docfi=0 #ifdef CONFIG_CPU_CAVIUM_OCTEON /* Restore the Octeon multiplier state */ jal octeon_mult_restore #endif #ifdef CONFIG_CPU_HAS_SMARTMIPS LONG_L $24, PT_ACX(sp) mtlhx $24 LONG_L $24, PT_HI(sp) mtlhx $24 LONG_L $24, PT_LO(sp) mtlhx $24 #elif !defined(CONFIG_CPU_MIPSR6) LONG_L $24, PT_LO(sp) mtlo $24 LONG_L $24, PT_HI(sp) mthi $24 #endif #ifdef CONFIG_32BIT cfi_ld $8, PT_R8, \docfi cfi_ld $9, PT_R9, \docfi #endif cfi_ld $10, PT_R10, \docfi cfi_ld $11, PT_R11, \docfi cfi_ld $12, PT_R12, \docfi cfi_ld $13, PT_R13, \docfi cfi_ld $14, PT_R14, \docfi cfi_ld $15, PT_R15, \docfi cfi_ld $24, PT_R24, \docfi .endm .macro RESTORE_STATIC docfi=0 cfi_ld $16, PT_R16, \docfi cfi_ld $17, PT_R17, \docfi cfi_ld $18, PT_R18, \docfi cfi_ld $19, PT_R19, \docfi cfi_ld $20, PT_R20, \docfi cfi_ld $21, PT_R21, \docfi cfi_ld $22, PT_R22, \docfi cfi_ld $23, PT_R23, \docfi cfi_ld $30, PT_R30, \docfi .endm .macro RESTORE_SP docfi=0 cfi_ld sp, PT_R29, \docfi .endm #if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX) .macro RESTORE_SOME docfi=0 .set push .set reorder .set noat mfc0 a0, CP0_STATUS li v1, ST0_CU1 | ST0_IM ori a0, STATMASK xori a0, STATMASK mtc0 a0, CP0_STATUS and a0, v1 LONG_L v0, PT_STATUS(sp) nor v1, $0, v1 and v0, v1 or v0, a0 mtc0 v0, CP0_STATUS cfi_ld $31, PT_R31, \docfi cfi_ld $28, PT_R28, \docfi cfi_ld $25, PT_R25, \docfi cfi_ld $7, PT_R7, \docfi cfi_ld $6, PT_R6, \docfi cfi_ld $5, PT_R5, \docfi cfi_ld $4, PT_R4, \docfi cfi_ld $3, PT_R3, \docfi cfi_ld $2, PT_R2, \docfi .set pop .endm .macro RESTORE_SP_AND_RET docfi=0 .set push .set noreorder LONG_L k0, PT_EPC(sp) RESTORE_SP \docfi jr k0 rfe .set pop .endm #else .macro RESTORE_SOME docfi=0 .set push .set reorder .set noat mfc0 a0, CP0_STATUS ori a0, STATMASK xori a0, STATMASK mtc0 a0, CP0_STATUS li v1, ST0_CU1 | ST0_FR | ST0_IM and a0, v1 LONG_L v0, PT_STATUS(sp) nor v1, $0, v1 and v0, v1 or v0, a0 mtc0 v0, CP0_STATUS LONG_L v1, PT_EPC(sp) MTC0 v1, CP0_EPC cfi_ld $31, PT_R31, \docfi cfi_ld $28, PT_R28, \docfi cfi_ld $25, PT_R25, \docfi #ifdef CONFIG_64BIT cfi_ld $8, PT_R8, \docfi cfi_ld $9, PT_R9, \docfi #endif cfi_ld $7, PT_R7, \docfi cfi_ld $6, PT_R6, \docfi cfi_ld $5, PT_R5, \docfi cfi_ld $4, PT_R4, \docfi cfi_ld $3, PT_R3, \docfi cfi_ld $2, PT_R2, \docfi .set pop .endm .macro RESTORE_SP_AND_RET docfi=0 RESTORE_SP \docfi #ifdef CONFIG_CPU_MIPSR6 eretnc #else .set arch=r4000 eret .set mips0 #endif .endm #endif .macro RESTORE_ALL docfi=0 RESTORE_TEMP \docfi RESTORE_STATIC \docfi RESTORE_AT \docfi RESTORE_SOME \docfi RESTORE_SP \docfi .endm /* * Move to kernel mode and disable interrupts. * Set cp0 enable bit as sign that we're running on the kernel stack */ .macro CLI mfc0 t0, CP0_STATUS li t1, ST0_CU0 | STATMASK or t0, t1 xori t0, STATMASK mtc0 t0, CP0_STATUS irq_disable_hazard .endm /* * Move to kernel mode and enable interrupts. * Set cp0 enable bit as sign that we're running on the kernel stack */ .macro STI mfc0 t0, CP0_STATUS li t1, ST0_CU0 | STATMASK or t0, t1 xori t0, STATMASK & ~1 mtc0 t0, CP0_STATUS irq_enable_hazard .endm /* * Just move to kernel mode and leave interrupts as they are. Note * for the R3000 this means copying the previous enable from IEp. * Set cp0 enable bit as sign that we're running on the kernel stack */ .macro KMODE mfc0 t0, CP0_STATUS li t1, ST0_CU0 | (STATMASK & ~1) #if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX) andi t2, t0, ST0_IEP srl t2, 2 or t0, t2 #endif or t0, t1 xori t0, STATMASK & ~1 mtc0 t0, CP0_STATUS irq_disable_hazard .endm #endif /* _ASM_STACKFRAME_H */ |