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| /*
| * 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, 1995, 1996, 1998, 1999, 2002, 2003 Ralf Baechle
| * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
| * Copyright (C) 1994, 1995, 1996, by Andreas Busse
| * Copyright (C) 1999 Silicon Graphics, Inc.
| * Copyright (C) 2000 MIPS Technologies, Inc.
| * written by Carsten Langgaard, carstenl@mips.com
| */
| #include <asm/asm.h>
| #include <asm/cachectl.h>
| #include <asm/fpregdef.h>
| #include <asm/mipsregs.h>
| #include <asm/asm-offsets.h>
| #include <asm/regdef.h>
| #include <asm/stackframe.h>
| #include <asm/thread_info.h>
|
| #include <asm/asmmacro.h>
|
| /* preprocessor replaces the fp in ".set fp=64" with $30 otherwise */
| #undef fp
|
| /*
| * Offset to the current process status flags, the first 32 bytes of the
| * stack are not used.
| */
| #define ST_OFF (_THREAD_SIZE - 32 - PT_SIZE + PT_STATUS)
|
| #ifndef USE_ALTERNATE_RESUME_IMPL
| /*
| * task_struct *resume(task_struct *prev, task_struct *next,
| * struct thread_info *next_ti)
| */
| .align 5
| LEAF(resume)
| mfc0 t1, CP0_STATUS
| LONG_S t1, THREAD_STATUS(a0)
| cpu_save_nonscratch a0
| LONG_S ra, THREAD_REG31(a0)
|
| #if defined(CONFIG_CC_STACKPROTECTOR) && !defined(CONFIG_SMP)
| PTR_LA t8, __stack_chk_guard
| LONG_L t9, TASK_STACK_CANARY(a1)
| LONG_S t9, 0(t8)
| #endif
|
| /*
| * The order of restoring the registers takes care of the race
| * updating $28, $29 and kernelsp without disabling ints.
| */
| move $28, a2
| cpu_restore_nonscratch a1
|
| PTR_ADDU t0, $28, _THREAD_SIZE - 32
| set_saved_sp t0, t1, t2
| mfc0 t1, CP0_STATUS /* Do we really need this? */
| li a3, 0xff01
| and t1, a3
| LONG_L a2, THREAD_STATUS(a1)
| nor a3, $0, a3
| and a2, a3
| or a2, t1
| mtc0 a2, CP0_STATUS
| move v0, a0
| jr ra
| END(resume)
|
| #endif /* USE_ALTERNATE_RESUME_IMPL */
|
| /*
| * Save a thread's fp context.
| */
| LEAF(_save_fp)
| #if defined(CONFIG_64BIT) || defined(CONFIG_CPU_MIPS32_R2) || \
| defined(CONFIG_CPU_MIPS32_R6)
| mfc0 t0, CP0_STATUS
| #endif
| fpu_save_double a0 t0 t1 # clobbers t1
| jr ra
| END(_save_fp)
|
| /*
| * Restore a thread's fp context.
| */
| LEAF(_restore_fp)
| #if defined(CONFIG_64BIT) || defined(CONFIG_CPU_MIPS32_R2) || \
| defined(CONFIG_CPU_MIPS32_R6)
| mfc0 t0, CP0_STATUS
| #endif
| fpu_restore_double a0 t0 t1 # clobbers t1
| jr ra
| END(_restore_fp)
|
| #ifdef CONFIG_CPU_HAS_MSA
|
| /*
| * Save a thread's MSA vector context.
| */
| LEAF(_save_msa)
| msa_save_all a0
| jr ra
| END(_save_msa)
|
| /*
| * Restore a thread's MSA vector context.
| */
| LEAF(_restore_msa)
| msa_restore_all a0
| jr ra
| END(_restore_msa)
|
| LEAF(_init_msa_upper)
| msa_init_all_upper
| jr ra
| END(_init_msa_upper)
|
| #endif
|
| /*
| * Load the FPU with signalling NANS. This bit pattern we're using has
| * the property that no matter whether considered as single or as double
| * precision represents signaling NANS.
| *
| * The value to initialize fcr31 to comes in $a0.
| */
|
| .set push
| SET_HARDFLOAT
|
| LEAF(_init_fpu)
| mfc0 t0, CP0_STATUS
| li t1, ST0_CU1
| or t0, t1
| mtc0 t0, CP0_STATUS
| enable_fpu_hazard
|
| ctc1 a0, fcr31
|
| li t1, -1 # SNaN
|
| #ifdef CONFIG_64BIT
| sll t0, t0, 5
| bgez t0, 1f # 16 / 32 register mode?
|
| dmtc1 t1, $f1
| dmtc1 t1, $f3
| dmtc1 t1, $f5
| dmtc1 t1, $f7
| dmtc1 t1, $f9
| dmtc1 t1, $f11
| dmtc1 t1, $f13
| dmtc1 t1, $f15
| dmtc1 t1, $f17
| dmtc1 t1, $f19
| dmtc1 t1, $f21
| dmtc1 t1, $f23
| dmtc1 t1, $f25
| dmtc1 t1, $f27
| dmtc1 t1, $f29
| dmtc1 t1, $f31
| 1:
| #endif
|
| #ifdef CONFIG_CPU_MIPS32
| mtc1 t1, $f0
| mtc1 t1, $f1
| mtc1 t1, $f2
| mtc1 t1, $f3
| mtc1 t1, $f4
| mtc1 t1, $f5
| mtc1 t1, $f6
| mtc1 t1, $f7
| mtc1 t1, $f8
| mtc1 t1, $f9
| mtc1 t1, $f10
| mtc1 t1, $f11
| mtc1 t1, $f12
| mtc1 t1, $f13
| mtc1 t1, $f14
| mtc1 t1, $f15
| mtc1 t1, $f16
| mtc1 t1, $f17
| mtc1 t1, $f18
| mtc1 t1, $f19
| mtc1 t1, $f20
| mtc1 t1, $f21
| mtc1 t1, $f22
| mtc1 t1, $f23
| mtc1 t1, $f24
| mtc1 t1, $f25
| mtc1 t1, $f26
| mtc1 t1, $f27
| mtc1 t1, $f28
| mtc1 t1, $f29
| mtc1 t1, $f30
| mtc1 t1, $f31
|
| #if defined(CONFIG_CPU_MIPS32_R2) || defined(CONFIG_CPU_MIPS32_R6)
| .set push
| .set MIPS_ISA_LEVEL_RAW
| .set fp=64
| sll t0, t0, 5 # is Status.FR set?
| bgez t0, 1f # no: skip setting upper 32b
|
| mthc1 t1, $f0
| mthc1 t1, $f1
| mthc1 t1, $f2
| mthc1 t1, $f3
| mthc1 t1, $f4
| mthc1 t1, $f5
| mthc1 t1, $f6
| mthc1 t1, $f7
| mthc1 t1, $f8
| mthc1 t1, $f9
| mthc1 t1, $f10
| mthc1 t1, $f11
| mthc1 t1, $f12
| mthc1 t1, $f13
| mthc1 t1, $f14
| mthc1 t1, $f15
| mthc1 t1, $f16
| mthc1 t1, $f17
| mthc1 t1, $f18
| mthc1 t1, $f19
| mthc1 t1, $f20
| mthc1 t1, $f21
| mthc1 t1, $f22
| mthc1 t1, $f23
| mthc1 t1, $f24
| mthc1 t1, $f25
| mthc1 t1, $f26
| mthc1 t1, $f27
| mthc1 t1, $f28
| mthc1 t1, $f29
| mthc1 t1, $f30
| mthc1 t1, $f31
| 1: .set pop
| #endif /* CONFIG_CPU_MIPS32_R2 || CONFIG_CPU_MIPS32_R6 */
| #else
| .set MIPS_ISA_ARCH_LEVEL_RAW
| dmtc1 t1, $f0
| dmtc1 t1, $f2
| dmtc1 t1, $f4
| dmtc1 t1, $f6
| dmtc1 t1, $f8
| dmtc1 t1, $f10
| dmtc1 t1, $f12
| dmtc1 t1, $f14
| dmtc1 t1, $f16
| dmtc1 t1, $f18
| dmtc1 t1, $f20
| dmtc1 t1, $f22
| dmtc1 t1, $f24
| dmtc1 t1, $f26
| dmtc1 t1, $f28
| dmtc1 t1, $f30
| #endif
| jr ra
| END(_init_fpu)
|
| .set pop /* SET_HARDFLOAT */
|
|