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/offset.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_MIPS32
  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_MIPS32
  60                 mfc0    k0, CP0_CONTEXT
  61                 lui     k1, %hi(kernelsp)
  62                 srl     k0, k0, 23
  63                 sll     k0, k0, 2
  64                 addu    k1, k0
  65                 LONG_L  k1, %lo(kernelsp)(k1)
  66 #endif
  67 #ifdef CONFIG_MIPS64
  68                 MFC0    k1, CP0_CONTEXT
  69                 dsra    k1, 23
  70                 lui     k0, %hi(pgd_current)
  71                 daddiu  k0, %lo(pgd_current)
  72                 dsubu   k1, k0
  73                 lui     k0, %hi(kernelsp)
  74                 daddu   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_MIPS32
  81                 mfc0    \temp, CP0_CONTEXT
  82                 srl     \temp, 23
  83                 sll     \temp, 2
  84                 LONG_S  \stackp, kernelsp(\temp)
  85 #endif
  86 #ifdef CONFIG_MIPS64
  87                 lw      \temp, TI_CPU(gp)
  88                 dsll    \temp, 3
  89                 lui     \temp2, %hi(kernelsp)
  90                 daddu   \temp, \temp2
  91                 LONG_S  \stackp, %lo(kernelsp)(\temp)
  92 #endif
  93                 .endm
  94 #else
  95                 .macro  get_saved_sp    /* Uniprocessor variation */
  96                 lui     k1, %hi(kernelsp)
  97                 LONG_L  k1, %lo(kernelsp)(k1)
  98                 .endm
  99
 100                 .macro  set_saved_sp stackp temp temp2
 101                 LONG_S  \stackp, kernelsp
 102                 .endm
 103 #endif
 104
 105                 .macro  SAVE_SOME
 106                 .set    push
 107                 .set    reorder
 108                 mfc0    k0, CP0_STATUS
 109                 sll     k0, 3           /* extract cu0 bit */
 110                 .set    noreorder
 111                 bltz    k0, 8f
 112                  move   k1, sp
 113                 .set    reorder
 114                 /* Called from user mode, new stack. */
 115                 get_saved_sp
 116 8:              move    k0, sp
 117                 PTR_SUBU sp, k1, PT_SIZE
 118                 LONG_S  k0, PT_R29(sp)
 119                 LONG_S  $3, PT_R3(sp)
 120                 LONG_S  $0, PT_R0(sp)
 121                 mfc0    v1, CP0_STATUS
 122                 LONG_S  $2, PT_R2(sp)
 123                 LONG_S  v1, PT_STATUS(sp)
 124                 LONG_S  $4, PT_R4(sp)
 125                 mfc0    v1, CP0_CAUSE
 126                 LONG_S  $5, PT_R5(sp)
 127                 LONG_S  v1, PT_CAUSE(sp)
 128                 LONG_S  $6, PT_R6(sp)
 129                 MFC0    v1, CP0_EPC
 130                 LONG_S  $7, PT_R7(sp)
 131 #ifdef CONFIG_MIPS64
 132                 LONG_S  $8, PT_R8(sp)
 133                 LONG_S  $9, PT_R9(sp)
 134 #endif
 135                 LONG_S  v1, PT_EPC(sp)
 136                 LONG_S  $25, PT_R25(sp)
 137                 LONG_S  $28, PT_R28(sp)
 138                 LONG_S  $31, PT_R31(sp)
 139                 ori     $28, sp, _THREAD_MASK
 140                 xori    $28, _THREAD_MASK
 141                 .set    pop
 142                 .endm
 143
 144                 .macro  SAVE_ALL
 145                 SAVE_SOME
 146                 SAVE_AT
 147                 SAVE_TEMP
 148                 SAVE_STATIC
 149                 .endm
 150
 151                 .macro  RESTORE_AT
 152                 .set    push
 153                 .set    noat
 154                 LONG_L  $1,  PT_R1(sp)
 155                 .set    pop
 156                 .endm
 157
 158                 .macro  RESTORE_TEMP
 159                 LONG_L  $24, PT_LO(sp)
 160 #ifdef CONFIG_MIPS32
 161                 LONG_L  $8, PT_R8(sp)
 162                 LONG_L  $9, PT_R9(sp)
 163 #endif
 164                 mtlo    $24
 165                 LONG_L  $24, PT_HI(sp)
 166                 LONG_L  $10, PT_R10(sp)
 167                 LONG_L  $11, PT_R11(sp)
 168                 mthi    $24
 169                 LONG_L  $12, PT_R12(sp)
 170                 LONG_L  $13, PT_R13(sp)
 171                 LONG_L  $14, PT_R14(sp)
 172                 LONG_L  $15, PT_R15(sp)
 173                 LONG_L  $24, PT_R24(sp)
 174                 .endm
 175
 176                 .macro  RESTORE_STATIC
 177                 LONG_L  $16, PT_R16(sp)
 178                 LONG_L  $17, PT_R17(sp)
 179                 LONG_L  $18, PT_R18(sp)
 180                 LONG_L  $19, PT_R19(sp)
 181                 LONG_L  $20, PT_R20(sp)
 182                 LONG_L  $21, PT_R21(sp)
 183                 LONG_L  $22, PT_R22(sp)
 184                 LONG_L  $23, PT_R23(sp)
 185                 LONG_L  $30, PT_R30(sp)
 186                 .endm
 187
 188 #if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
 189
 190                 .macro  RESTORE_SOME
 191                 .set    push
 192                 .set    reorder
 193                 .set    noat
 194                 mfc0    a0, CP0_STATUS
 195                 ori     a0, 0x1f
 196                 xori    a0, 0x1f
 197                 mtc0    a0, CP0_STATUS
 198                 li      v1, 0xff00
 199                 and     a0, v1
 200                 LONG_L  v0, PT_STATUS(sp)
 201                 nor     v1, $0, v1
 202                 and     v0, v1
 203                 or      v0, a0
 204                 mtc0    v0, CP0_STATUS
 205                 LONG_L  $31, PT_R31(sp)
 206                 LONG_L  $28, PT_R28(sp)
 207                 LONG_L  $25, PT_R25(sp)
 208 #ifdef CONFIG_MIPS64
 209                 LONG_L  $8, PT_R8(sp)
 210                 LONG_L  $9, PT_R9(sp)
 211 #endif
 212                 LONG_L  $7,  PT_R7(sp)
 213                 LONG_L  $6,  PT_R6(sp)
 214                 LONG_L  $5,  PT_R5(sp)
 215                 LONG_L  $4,  PT_R4(sp)
 216                 LONG_L  $3,  PT_R3(sp)
 217                 LONG_L  $2,  PT_R2(sp)
 218                 .set    pop
 219                 .endm
 220
 221                 .macro  RESTORE_SP_AND_RET
 222                 .set    push
 223                 .set    noreorder
 224                 LONG_L  k0, PT_EPC(sp)
 225                 LONG_L  sp, PT_R29(sp)
 226                 jr      k0
 227                  rfe
 228                 .set    pop
 229                 .endm
 230
 231 #else
 232
 233                 .macro  RESTORE_SOME
 234                 .set    push
 235                 .set    reorder
 236                 .set    noat
 237                 mfc0    a0, CP0_STATUS
 238                 ori     a0, 0x1f
 239                 xori    a0, 0x1f
 240                 mtc0    a0, CP0_STATUS
 241                 li      v1, 0xff00
 242                 and     a0, v1
 243                 LONG_L  v0, PT_STATUS(sp)
 244                 nor     v1, $0, v1
 245                 and     v0, v1
 246                 or      v0, a0
 247                 mtc0    v0, CP0_STATUS
 248                 LONG_L  v1, PT_EPC(sp)
 249                 MTC0    v1, CP0_EPC
 250                 LONG_L  $31, PT_R31(sp)
 251                 LONG_L  $28, PT_R28(sp)
 252                 LONG_L  $25, PT_R25(sp)
 253 #ifdef CONFIG_MIPS64
 254                 LONG_L  $8, PT_R8(sp)
 255                 LONG_L  $9, PT_R9(sp)
 256 #endif
 257                 LONG_L  $7,  PT_R7(sp)
 258                 LONG_L  $6,  PT_R6(sp)
 259                 LONG_L  $5,  PT_R5(sp)
 260                 LONG_L  $4,  PT_R4(sp)
 261                 LONG_L  $3,  PT_R3(sp)
 262                 LONG_L  $2,  PT_R2(sp)
 263                 .set    pop
 264                 .endm
 265
 266                 .macro  RESTORE_SP_AND_RET
 267                 LONG_L  sp, PT_R29(sp)
 268                 .set    mips3
 269                 eret
 270                 .set    mips0
 271                 .endm
 272
 273 #endif
 274
 275                 .macro  RESTORE_SP
 276                 LONG_L  sp, PT_R29(sp)
 277                 .endm
 278
 279                 .macro  RESTORE_ALL
 280                 RESTORE_TEMP
 281                 RESTORE_AT
 282                 RESTORE_STATIC
 283                 RESTORE_SOME
 284                 RESTORE_SP
 285                 .endm
 286
 287                 .macro  RESTORE_ALL_AND_RET
 288                 RESTORE_TEMP
 289                 RESTORE_AT
 290                 RESTORE_STATIC
 291                 RESTORE_SOME
 292                 RESTORE_SP_AND_RET
 293                 .endm
 294
 295 /*
 296  * Move to kernel mode and disable interrupts.
 297  * Set cp0 enable bit as sign that we're running on the kernel stack
 298  */
 299                 .macro  CLI
 300                 mfc0    t0, CP0_STATUS
 301                 li      t1, ST0_CU0 | 0x1f
 302                 or      t0, t1
 303                 xori    t0, 0x1f
 304                 mtc0    t0, CP0_STATUS
 305                 irq_disable_hazard
 306                 .endm
 307
 308 /*
 309  * Move to kernel mode and enable interrupts.
 310  * Set cp0 enable bit as sign that we're running on the kernel stack
 311  */
 312                 .macro  STI
 313                 mfc0    t0, CP0_STATUS
 314                 li      t1, ST0_CU0 | 0x1f
 315                 or      t0, t1
 316                 xori    t0, 0x1e
 317                 mtc0    t0, CP0_STATUS
 318                 irq_enable_hazard
 319                 .endm
 320
 321 /*
 322  * Just move to kernel mode and leave interrupts as they are.
 323  * Set cp0 enable bit as sign that we're running on the kernel stack
 324  */
 325                 .macro  KMODE
 326                 mfc0    t0, CP0_STATUS
 327                 li      t1, ST0_CU0 | 0x1e
 328                 or      t0, t1
 329                 xori    t0, 0x1e
 330                 mtc0    t0, CP0_STATUS
 331                 irq_disable_hazard
 332                 .endm
 333
 334 #endif /* _ASM_STACKFRAME_H */