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