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
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.
10 #ifndef _ASM_STACKFRAME_H
11 #define _ASM_STACKFRAME_H
13 #include <linux/threads.h>
16 #include <asm/asmmacro.h>
17 #include <asm/mipsregs.h>
18 #include <asm/asm-offsets.h>
21 * For SMTC kernel, global IE should be left set, and interrupts
22 * controlled exclusively via IXMT.
24 #ifdef CONFIG_MIPS_MT_SMTC
26 #elif defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
32 #ifdef CONFIG_MIPS_MT_SMTC
33 #include <asm/mipsmtregs.h>
34 #endif /* CONFIG_MIPS_MT_SMTC */
44 #ifdef CONFIG_CPU_HAS_SMARTMIPS
61 LONG_S $10, PT_R10(sp)
62 LONG_S $11, PT_R11(sp)
63 LONG_S $12, PT_R12(sp)
64 LONG_S $13, PT_R13(sp)
65 LONG_S $14, PT_R14(sp)
66 LONG_S $15, PT_R15(sp)
67 LONG_S $24, PT_R24(sp)
71 LONG_S $16, PT_R16(sp)
72 LONG_S $17, PT_R17(sp)
73 LONG_S $18, PT_R18(sp)
74 LONG_S $19, PT_R19(sp)
75 LONG_S $20, PT_R20(sp)
76 LONG_S $21, PT_R21(sp)
77 LONG_S $22, PT_R22(sp)
78 LONG_S $23, PT_R23(sp)
79 LONG_S $30, PT_R30(sp)
83 #ifdef CONFIG_MIPS_MT_SMTC
84 #define PTEBASE_SHIFT 19 /* TCBIND */
86 #define PTEBASE_SHIFT 23 /* CONTEXT */
88 .macro get_saved_sp /* SMP variation */
89 #ifdef CONFIG_MIPS_MT_SMTC
94 #if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32)
97 lui k1, %highest(kernelsp)
98 daddiu k1, %higher(kernelsp)
100 daddiu k1, %hi(kernelsp)
103 LONG_SRL k0, PTEBASE_SHIFT
105 LONG_L k1, %lo(kernelsp)(k1)
108 .macro set_saved_sp stackp temp temp2
109 #ifdef CONFIG_MIPS_MT_SMTC
110 mfc0 \temp, CP0_TCBIND
112 MFC0 \temp, CP0_CONTEXT
114 LONG_SRL \temp, PTEBASE_SHIFT
115 LONG_S \stackp, kernelsp(\temp)
118 .macro get_saved_sp /* Uniprocessor variation */
119 #if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32)
120 lui k1, %hi(kernelsp)
122 lui k1, %highest(kernelsp)
123 daddiu k1, %higher(kernelsp)
125 daddiu k1, %hi(kernelsp)
128 LONG_L k1, %lo(kernelsp)(k1)
131 .macro set_saved_sp stackp temp temp2
132 LONG_S \stackp, kernelsp
141 sll k0, 3 /* extract cu0 bit */
146 /* Called from user mode, new stack. */
149 PTR_SUBU sp, k1, PT_SIZE
150 LONG_S k0, PT_R29(sp)
153 * You might think that you don't need to save $0,
154 * but the FPU emulator and gdb remote debug stub
155 * need it to operate correctly
160 LONG_S v1, PT_STATUS(sp)
161 #ifdef CONFIG_MIPS_MT_SMTC
163 * Ideally, these instructions would be shuffled in
164 * to cover the pipeline delay.
167 mfc0 v1, CP0_TCSTATUS
169 LONG_S v1, PT_TCSTATUS(sp)
170 #endif /* CONFIG_MIPS_MT_SMTC */
174 LONG_S v1, PT_CAUSE(sp)
182 LONG_S v1, PT_EPC(sp)
183 LONG_S $25, PT_R25(sp)
184 LONG_S $28, PT_R28(sp)
185 LONG_S $31, PT_R31(sp)
186 ori $28, sp, _THREAD_MASK
187 xori $28, _THREAD_MASK
206 #ifdef CONFIG_CPU_HAS_SMARTMIPS
207 LONG_L $24, PT_ACX(sp)
209 LONG_L $24, PT_HI(sp)
211 LONG_L $24, PT_LO(sp)
214 LONG_L $24, PT_LO(sp)
216 LONG_L $24, PT_HI(sp)
223 LONG_L $10, PT_R10(sp)
224 LONG_L $11, PT_R11(sp)
225 LONG_L $12, PT_R12(sp)
226 LONG_L $13, PT_R13(sp)
227 LONG_L $14, PT_R14(sp)
228 LONG_L $15, PT_R15(sp)
229 LONG_L $24, PT_R24(sp)
232 .macro RESTORE_STATIC
233 LONG_L $16, PT_R16(sp)
234 LONG_L $17, PT_R17(sp)
235 LONG_L $18, PT_R18(sp)
236 LONG_L $19, PT_R19(sp)
237 LONG_L $20, PT_R20(sp)
238 LONG_L $21, PT_R21(sp)
239 LONG_L $22, PT_R22(sp)
240 LONG_L $23, PT_R23(sp)
241 LONG_L $30, PT_R30(sp)
244 #if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
256 LONG_L v0, PT_STATUS(sp)
261 LONG_L $31, PT_R31(sp)
262 LONG_L $28, PT_R28(sp)
263 LONG_L $25, PT_R25(sp)
273 .macro RESTORE_SP_AND_RET
276 LONG_L k0, PT_EPC(sp)
277 LONG_L sp, PT_R29(sp)
288 #ifdef CONFIG_MIPS_MT_SMTC
291 * This may not really be necessary if ints are already
294 mfc0 v0, CP0_TCSTATUS
295 ori v0, TCSTATUS_IXMT
296 mtc0 v0, CP0_TCSTATUS
300 #endif /* CONFIG_MIPS_MT_SMTC */
307 LONG_L v0, PT_STATUS(sp)
312 #ifdef CONFIG_MIPS_MT_SMTC
314 * Only after EXL/ERL have been restored to status can we
315 * restore TCStatus.IXMT.
317 LONG_L v1, PT_TCSTATUS(sp)
319 mfc0 v0, CP0_TCSTATUS
320 andi v1, TCSTATUS_IXMT
321 /* We know that TCStatua.IXMT should be set from above */
322 xori v0, v0, TCSTATUS_IXMT
324 mtc0 v0, CP0_TCSTATUS
326 andi a1, a1, VPECONTROL_TE
331 #endif /* CONFIG_MIPS_MT_SMTC */
332 LONG_L v1, PT_EPC(sp)
334 LONG_L $31, PT_R31(sp)
335 LONG_L $28, PT_R28(sp)
336 LONG_L $25, PT_R25(sp)
350 .macro RESTORE_SP_AND_RET
351 LONG_L sp, PT_R29(sp)
360 LONG_L sp, PT_R29(sp)
371 .macro RESTORE_ALL_AND_RET
380 * Move to kernel mode and disable interrupts.
381 * Set cp0 enable bit as sign that we're running on the kernel stack
384 #if !defined(CONFIG_MIPS_MT_SMTC)
386 li t1, ST0_CU0 | STATMASK
390 #else /* CONFIG_MIPS_MT_SMTC */
392 * For SMTC, we need to set privilege
393 * and disable interrupts only for the
394 * current TC, using the TCStatus register.
396 mfc0 t0, CP0_TCSTATUS
397 /* Fortunately CU 0 is in the same place in both registers */
398 /* Set TCU0, TMX, TKSU (for later inversion) and IXMT */
399 li t1, ST0_CU0 | 0x08001c00
401 /* Clear TKSU, leave IXMT */
403 mtc0 t0, CP0_TCSTATUS
405 /* We need to leave the global IE bit set, but clear EXL...*/
407 ori t0, ST0_EXL | ST0_ERL
408 xori t0, ST0_EXL | ST0_ERL
410 #endif /* CONFIG_MIPS_MT_SMTC */
415 * Move to kernel mode and enable interrupts.
416 * Set cp0 enable bit as sign that we're running on the kernel stack
419 #if !defined(CONFIG_MIPS_MT_SMTC)
421 li t1, ST0_CU0 | STATMASK
423 xori t0, STATMASK & ~1
425 #else /* CONFIG_MIPS_MT_SMTC */
427 * For SMTC, we need to set privilege
428 * and enable interrupts only for the
429 * current TC, using the TCStatus register.
432 mfc0 t0, CP0_TCSTATUS
433 /* Fortunately CU 0 is in the same place in both registers */
434 /* Set TCU0, TKSU (for later inversion) and IXMT */
435 li t1, ST0_CU0 | 0x08001c00
437 /* Clear TKSU *and* IXMT */
439 mtc0 t0, CP0_TCSTATUS
441 /* We need to leave the global IE bit set, but clear EXL...*/
446 /* irq_enable_hazard below should expand to EHB for 24K/34K cpus */
447 #endif /* CONFIG_MIPS_MT_SMTC */
452 * Just move to kernel mode and leave interrupts as they are. Note
453 * for the R3000 this means copying the previous enable from IEp.
454 * Set cp0 enable bit as sign that we're running on the kernel stack
457 #ifdef CONFIG_MIPS_MT_SMTC
459 * This gets baroque in SMTC. We want to
460 * protect the non-atomic clearing of EXL
461 * with DMT/EMT, but we don't want to take
462 * an interrupt while DMT is still in effect.
465 /* KMODE gets invoked from both reorder and noreorder code */
469 mfc0 v0, CP0_TCSTATUS
470 andi v1, v0, TCSTATUS_IXMT
471 ori v0, TCSTATUS_IXMT
472 mtc0 v0, CP0_TCSTATUS
476 * We don't know a priori if ra is "live"
482 #endif /* CONFIG_MIPS_MT_SMTC */
484 li t1, ST0_CU0 | (STATMASK & ~1)
485 #if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
491 xori t0, STATMASK & ~1
493 #ifdef CONFIG_MIPS_MT_SMTC
495 andi v0, v0, VPECONTROL_TE
500 mfc0 v0, CP0_TCSTATUS
501 /* Clear IXMT, then OR in previous value */
502 ori v0, TCSTATUS_IXMT
503 xori v0, TCSTATUS_IXMT
505 mtc0 v0, CP0_TCSTATUS
507 * irq_disable_hazard below should expand to EHB
511 #endif /* CONFIG_MIPS_MT_SMTC */
515 #endif /* _ASM_STACKFRAME_H */