include/asm-mips/stackframe.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1994, 95, 96, 99, 2001 Ralf Baechle
   7  * Copyright (C) 1994, 1995, 1996 Paul M. Antoine.
   8  * Copyright (C) 1999 Silicon Graphics, Inc.
   9  */
  10 #ifndef _ASM_STACKFRAME_H
  11 #define _ASM_STACKFRAME_H
  12
  13 #include <linux/config.h>
  14 #include <linux/threads.h>
  15
  16 #include <asm/asm.h>
  17 #include <asm/mipsregs.h>
  18 #include <asm/asm-offsets.h>
  19
  20                 .macro  SAVE_AT
  21                 .set    push
  22                 .set    noat
  23                 LONG_S  $1, PT_R1(sp)
  24                 .set    pop
  25                 .endm
  26
  27                 .macro  SAVE_TEMP
  28                 mfhi    v1
  29 #ifdef CONFIG_32BIT
  30                 LONG_S  $8, PT_R8(sp)
  31                 LONG_S  $9, PT_R9(sp)
  32 #endif
  33                 LONG_S  v1, PT_HI(sp)
  34                 mflo    v1
  35                 LONG_S  $10, PT_R10(sp)
  36                 LONG_S  $11, PT_R11(sp)
  37                 LONG_S  v1,  PT_LO(sp)
  38                 LONG_S  $12, PT_R12(sp)
  39                 LONG_S  $13, PT_R13(sp)
  40                 LONG_S  $14, PT_R14(sp)
  41                 LONG_S  $15, PT_R15(sp)
  42                 LONG_S  $24, PT_R24(sp)
  43                 .endm
  44
  45                 .macro  SAVE_STATIC
  46                 LONG_S  $16, PT_R16(sp)
  47                 LONG_S  $17, PT_R17(sp)
  48                 LONG_S  $18, PT_R18(sp)
  49                 LONG_S  $19, PT_R19(sp)
  50                 LONG_S  $20, PT_R20(sp)
  51                 LONG_S  $21, PT_R21(sp)
  52                 LONG_S  $22, PT_R22(sp)
  53                 LONG_S  $23, PT_R23(sp)
  54                 LONG_S  $30, PT_R30(sp)
  55                 .endm
  56
  57 #ifdef CONFIG_SMP
  58                 .macro  get_saved_sp    /* SMP variation */
  59 #ifdef CONFIG_32BIT
  60                 mfc0    k0, CP0_CONTEXT
  61                 lui     k1, %hi(kernelsp)
  62                 srl     k0, k0, 23
  63                 addu    k1, k0
  64                 LONG_L  k1, %lo(kernelsp)(k1)
  65 #endif
  66 #if defined(CONFIG_64BIT) && !defined(CONFIG_BUILD_ELF64)
  67                 MFC0    k1, CP0_CONTEXT
  68                 dsra    k1, 23
  69                 lui     k0, %hi(pgd_current)
  70                 addiu   k0, %lo(pgd_current)
  71                 dsubu   k1, k0
  72                 lui     k0, %hi(kernelsp)
  73                 daddu   k1, k0
  74                 LONG_L  k1, %lo(kernelsp)(k1)
  75 #endif
  76 #if defined(CONFIG_64BIT) && defined(CONFIG_BUILD_ELF64)
  77                 MFC0    k1, CP0_CONTEXT
  78                 lui     k0, %highest(kernelsp)
  79                 dsrl    k1, 23
  80                 daddiu  k0, %higher(kernelsp)
  81                 dsll    k0, k0, 16
  82                 daddiu  k0, %hi(kernelsp)
  83                 dsll    k0, k0, 16
  84                 daddu   k1, k1, k0
  85                 LONG_L  k1, %lo(kernelsp)(k1)
  86 #endif
  87                 .endm
  88
  89                 .macro  set_saved_sp stackp temp temp2
  90 #ifdef CONFIG_32BIT
  91                 mfc0    \temp, CP0_CONTEXT
  92                 srl     \temp, 23
  93 #endif
  94 #if defined(CONFIG_64BIT) && !defined(CONFIG_BUILD_ELF64)
  95                 lw      \temp, TI_CPU(gp)
  96                 dsll    \temp, 3
  97 #endif
  98 #if defined(CONFIG_64BIT) && defined(CONFIG_BUILD_ELF64)
  99                 MFC0    \temp, CP0_CONTEXT
 100                 dsrl    \temp, 23
 101 #endif
 102                 LONG_S  \stackp, kernelsp(\temp)
 103                 .endm
 104 #else
 105                 .macro  get_saved_sp    /* Uniprocessor variation */
 106 #if defined(CONFIG_64BIT) && defined(CONFIG_BUILD_ELF64)
 107                 lui     k1, %highest(kernelsp)
 108                 daddiu  k1, %higher(kernelsp)
 109                 dsll    k1, k1, 16
 110                 daddiu  k1, %hi(kernelsp)
 111                 dsll    k1, k1, 16
 112 #else
 113                 lui     k1, %hi(kernelsp)
 114 #endif
 115                 LONG_L  k1, %lo(kernelsp)(k1)
 116                 .endm
 117
 118                 .macro  set_saved_sp stackp temp temp2
 119                 LONG_S  \stackp, kernelsp
 120                 .endm
 121 #endif
 122
 123                 .macro  SAVE_SOME
 124                 .set    push
 125                 .set    noat
 126                 .set    reorder
 127                 mfc0    k0, CP0_STATUS
 128                 sll     k0, 3           /* extract cu0 bit */
 129                 .set    noreorder
 130                 bltz    k0, 8f
 131                  move   k1, sp
 132                 .set    reorder
 133                 /* Called from user mode, new stack. */
 134                 get_saved_sp
 135 8:              move    k0, sp
 136                 PTR_SUBU sp, k1, PT_SIZE
 137                 LONG_S  k0, PT_R29(sp)
 138                 LONG_S  $3, PT_R3(sp)
 139                 LONG_S  $0, PT_R0(sp)
 140                 mfc0    v1, CP0_STATUS
 141                 LONG_S  $2, PT_R2(sp)
 142                 LONG_S  v1, PT_STATUS(sp)
 143                 LONG_S  $4, PT_R4(sp)
 144                 mfc0    v1, CP0_CAUSE
 145                 LONG_S  $5, PT_R5(sp)
 146                 LONG_S  v1, PT_CAUSE(sp)
 147                 LONG_S  $6, PT_R6(sp)
 148                 MFC0    v1, CP0_EPC
 149                 LONG_S  $7, PT_R7(sp)
 150 #ifdef CONFIG_64BIT
 151                 LONG_S  $8, PT_R8(sp)
 152                 LONG_S  $9, PT_R9(sp)
 153 #endif
 154                 LONG_S  v1, PT_EPC(sp)
 155                 LONG_S  $25, PT_R25(sp)
 156                 LONG_S  $28, PT_R28(sp)
 157                 LONG_S  $31, PT_R31(sp)
 158                 ori     $28, sp, _THREAD_MASK
 159                 xori    $28, _THREAD_MASK
 160                 .set    pop
 161                 .endm
 162
 163                 .macro  SAVE_ALL
 164                 SAVE_SOME
 165                 SAVE_AT
 166                 SAVE_TEMP
 167                 SAVE_STATIC
 168                 .endm
 169
 170                 .macro  RESTORE_AT
 171                 .set    push
 172                 .set    noat
 173                 LONG_L  $1,  PT_R1(sp)
 174                 .set    pop
 175                 .endm
 176
 177                 .macro  RESTORE_TEMP
 178                 LONG_L  $24, PT_LO(sp)
 179 #ifdef CONFIG_32BIT
 180                 LONG_L  $8, PT_R8(sp)
 181                 LONG_L  $9, PT_R9(sp)
 182 #endif
 183                 mtlo    $24
 184                 LONG_L  $24, PT_HI(sp)
 185                 LONG_L  $10, PT_R10(sp)
 186                 LONG_L  $11, PT_R11(sp)
 187                 mthi    $24
 188                 LONG_L  $12, PT_R12(sp)
 189                 LONG_L  $13, PT_R13(sp)
 190                 LONG_L  $14, PT_R14(sp)
 191                 LONG_L  $15, PT_R15(sp)
 192                 LONG_L  $24, PT_R24(sp)
 193                 .endm
 194
 195                 .macro  RESTORE_STATIC
 196                 LONG_L  $16, PT_R16(sp)
 197                 LONG_L  $17, PT_R17(sp)
 198                 LONG_L  $18, PT_R18(sp)
 199                 LONG_L  $19, PT_R19(sp)
 200                 LONG_L  $20, PT_R20(sp)
 201                 LONG_L  $21, PT_R21(sp)
 202                 LONG_L  $22, PT_R22(sp)
 203                 LONG_L  $23, PT_R23(sp)
 204                 LONG_L  $30, PT_R30(sp)
 205                 .endm
 206
 207 #if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
 208
 209                 .macro  RESTORE_SOME
 210                 .set    push
 211                 .set    reorder
 212                 .set    noat
 213                 mfc0    a0, CP0_STATUS
 214                 ori     a0, 0x1f
 215                 xori    a0, 0x1f
 216                 mtc0    a0, CP0_STATUS
 217                 li      v1, 0xff00
 218                 and     a0, v1
 219                 LONG_L  v0, PT_STATUS(sp)
 220                 nor     v1, $0, v1
 221                 and     v0, v1
 222                 or      v0, a0
 223                 mtc0    v0, CP0_STATUS
 224                 LONG_L  $31, PT_R31(sp)
 225                 LONG_L  $28, PT_R28(sp)
 226                 LONG_L  $25, PT_R25(sp)
 227 #ifdef CONFIG_64BIT
 228                 LONG_L  $8, PT_R8(sp)
 229                 LONG_L  $9, PT_R9(sp)
 230 #endif
 231                 LONG_L  $7,  PT_R7(sp)
 232                 LONG_L  $6,  PT_R6(sp)
 233                 LONG_L  $5,  PT_R5(sp)
 234                 LONG_L  $4,  PT_R4(sp)
 235                 LONG_L  $3,  PT_R3(sp)
 236                 LONG_L  $2,  PT_R2(sp)
 237                 .set    pop
 238                 .endm
 239
 240                 .macro  RESTORE_SP_AND_RET
 241                 .set    push
 242                 .set    noreorder
 243                 LONG_L  k0, PT_EPC(sp)
 244                 LONG_L  sp, PT_R29(sp)
 245                 jr      k0
 246                  rfe
 247                 .set    pop
 248                 .endm
 249
 250 #else
 251
 252                 .macro  RESTORE_SOME
 253                 .set    push
 254                 .set    reorder
 255                 .set    noat
 256                 mfc0    a0, CP0_STATUS
 257                 ori     a0, 0x1f
 258                 xori    a0, 0x1f
 259                 mtc0    a0, CP0_STATUS
 260                 li      v1, 0xff00
 261                 and     a0, v1
 262                 LONG_L  v0, PT_STATUS(sp)
 263                 nor     v1, $0, v1
 264                 and     v0, v1
 265                 or      v0, a0
 266                 mtc0    v0, CP0_STATUS
 267                 LONG_L  v1, PT_EPC(sp)
 268                 MTC0    v1, CP0_EPC
 269                 LONG_L  $31, PT_R31(sp)
 270                 LONG_L  $28, PT_R28(sp)
 271                 LONG_L  $25, PT_R25(sp)
 272 #ifdef CONFIG_64BIT
 273                 LONG_L  $8, PT_R8(sp)
 274                 LONG_L  $9, PT_R9(sp)
 275 #endif
 276                 LONG_L  $7,  PT_R7(sp)
 277                 LONG_L  $6,  PT_R6(sp)
 278                 LONG_L  $5,  PT_R5(sp)
 279                 LONG_L  $4,  PT_R4(sp)
 280                 LONG_L  $3,  PT_R3(sp)
 281                 LONG_L  $2,  PT_R2(sp)
 282                 .set    pop
 283                 .endm
 284
 285                 .macro  RESTORE_SP_AND_RET
 286                 LONG_L  sp, PT_R29(sp)
 287                 .set    mips3
 288                 eret
 289                 .set    mips0
 290                 .endm
 291
 292 #endif
 293
 294                 .macro  RESTORE_SP
 295                 LONG_L  sp, PT_R29(sp)
 296                 .endm
 297
 298                 .macro  RESTORE_ALL
 299                 RESTORE_TEMP
 300                 RESTORE_STATIC
 301                 RESTORE_AT
 302                 RESTORE_SOME
 303                 RESTORE_SP
 304                 .endm
 305
 306                 .macro  RESTORE_ALL_AND_RET
 307                 RESTORE_TEMP
 308                 RESTORE_STATIC
 309                 RESTORE_AT
 310                 RESTORE_SOME
 311                 RESTORE_SP_AND_RET
 312                 .endm
 313
 314 /*
 315  * Move to kernel mode and disable interrupts.
 316  * Set cp0 enable bit as sign that we're running on the kernel stack
 317  */
 318                 .macro  CLI
 319                 mfc0    t0, CP0_STATUS
 320                 li      t1, ST0_CU0 | 0x1f
 321                 or      t0, t1
 322                 xori    t0, 0x1f
 323                 mtc0    t0, CP0_STATUS
 324                 irq_disable_hazard
 325                 .endm
 326
 327 /*
 328  * Move to kernel mode and enable interrupts.
 329  * Set cp0 enable bit as sign that we're running on the kernel stack
 330  */
 331                 .macro  STI
 332                 mfc0    t0, CP0_STATUS
 333                 li      t1, ST0_CU0 | 0x1f
 334                 or      t0, t1
 335                 xori    t0, 0x1e
 336                 mtc0    t0, CP0_STATUS
 337                 irq_enable_hazard
 338                 .endm
 339
 340 /*
 341  * Just move to kernel mode and leave interrupts as they are.
 342  * Set cp0 enable bit as sign that we're running on the kernel stack
 343  */
 344                 .macro  KMODE
 345                 mfc0    t0, CP0_STATUS
 346                 li      t1, ST0_CU0 | 0x1e
 347                 or      t0, t1
 348                 xori    t0, 0x1e
 349                 mtc0    t0, CP0_STATUS
 350                 irq_disable_hazard
 351                 .endm
 352
 353 #endif /* _ASM_STACKFRAME_H */