615 lines
14 KiB
C
615 lines
14 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1994, 95, 96, 99, 2001 Ralf Baechle
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* Copyright (C) 1994, 1995, 1996 Paul M. Antoine.
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* Copyright (C) 1999 Silicon Graphics, Inc.
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* Copyright (C) 2007 Maciej W. Rozycki
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*/
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#ifndef _ASM_STACKFRAME_H
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#define _ASM_STACKFRAME_H
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#include <linux/threads.h>
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#include <asm/asm.h>
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#include <asm/asmmacro.h>
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#include <asm/mipsregs.h>
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#include <asm/asm-offsets.h>
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/*
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* For SMTC kernel, global IE should be left set, and interrupts
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* controlled exclusively via IXMT.
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*/
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#ifdef CONFIG_MIPS_MT_SMTC
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#define STATMASK 0x1e
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#elif defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
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#define STATMASK 0x3f
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#else
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#define STATMASK 0x1f
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#endif
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#ifdef CONFIG_MIPS_MT_SMTC
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#include <asm/mipsmtregs.h>
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#endif /* CONFIG_MIPS_MT_SMTC */
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.macro SAVE_AT
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.set push
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.set noat
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LONG_S $1, PT_R1(sp)
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.set pop
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.endm
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.macro SAVE_TEMP
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#ifdef CONFIG_CPU_HAS_SMARTMIPS
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mflhxu v1
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LONG_S v1, PT_LO(sp)
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mflhxu v1
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LONG_S v1, PT_HI(sp)
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mflhxu v1
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LONG_S v1, PT_ACX(sp)
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#else
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mfhi v1
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#endif
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#ifdef CONFIG_32BIT
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LONG_S $8, PT_R8(sp)
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LONG_S $9, PT_R9(sp)
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#endif
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LONG_S $10, PT_R10(sp)
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LONG_S $11, PT_R11(sp)
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LONG_S $12, PT_R12(sp)
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#ifndef CONFIG_CPU_HAS_SMARTMIPS
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LONG_S v1, PT_HI(sp)
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mflo v1
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#endif
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LONG_S $13, PT_R13(sp)
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LONG_S $14, PT_R14(sp)
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LONG_S $15, PT_R15(sp)
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LONG_S $24, PT_R24(sp)
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#ifndef CONFIG_CPU_HAS_SMARTMIPS
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LONG_S v1, PT_LO(sp)
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#endif
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.endm
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.macro SAVE_STATIC
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LONG_S $16, PT_R16(sp)
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LONG_S $17, PT_R17(sp)
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LONG_S $18, PT_R18(sp)
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LONG_S $19, PT_R19(sp)
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LONG_S $20, PT_R20(sp)
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LONG_S $21, PT_R21(sp)
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LONG_S $22, PT_R22(sp)
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LONG_S $23, PT_R23(sp)
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LONG_S $30, PT_R30(sp)
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.endm
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#ifdef CONFIG_SMP
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#ifdef CONFIG_MIPS_MT_SMTC
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#define PTEBASE_SHIFT 19 /* TCBIND */
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#define CPU_ID_REG CP0_TCBIND
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#define CPU_ID_MFC0 mfc0
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#elif defined(CONFIG_MIPS_PGD_C0_CONTEXT)
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#define PTEBASE_SHIFT 48 /* XCONTEXT */
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#define CPU_ID_REG CP0_XCONTEXT
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#define CPU_ID_MFC0 MFC0
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#else
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#define PTEBASE_SHIFT 23 /* CONTEXT */
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#define CPU_ID_REG CP0_CONTEXT
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#define CPU_ID_MFC0 MFC0
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#endif
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.macro get_saved_sp /* SMP variation */
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CPU_ID_MFC0 k0, CPU_ID_REG
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#if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32)
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lui k1, %hi(kernelsp)
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#else
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lui k1, %highest(kernelsp)
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daddiu k1, %higher(kernelsp)
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dsll k1, 16
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daddiu k1, %hi(kernelsp)
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dsll k1, 16
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#endif
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LONG_SRL k0, PTEBASE_SHIFT
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LONG_ADDU k1, k0
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LONG_L k1, %lo(kernelsp)(k1)
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.endm
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.macro set_saved_sp stackp temp temp2
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CPU_ID_MFC0 \temp, CPU_ID_REG
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LONG_SRL \temp, PTEBASE_SHIFT
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LONG_S \stackp, kernelsp(\temp)
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.endm
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#else
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.macro get_saved_sp /* Uniprocessor variation */
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#ifdef CONFIG_CPU_JUMP_WORKAROUNDS
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/*
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* Clear BTB (branch target buffer), forbid RAS (return address
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* stack) to workaround the Out-of-order Issue in Loongson2F
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* via its diagnostic register.
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*/
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move k0, ra
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jal 1f
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nop
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1: jal 1f
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nop
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1: jal 1f
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nop
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1: jal 1f
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nop
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1: move ra, k0
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li k0, 3
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mtc0 k0, $22
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#endif /* CONFIG_CPU_LOONGSON2F */
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#if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32)
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lui k1, %hi(kernelsp)
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#else
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lui k1, %highest(kernelsp)
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daddiu k1, %higher(kernelsp)
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dsll k1, k1, 16
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daddiu k1, %hi(kernelsp)
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dsll k1, k1, 16
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#endif
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LONG_L k1, %lo(kernelsp)(k1)
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.endm
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.macro set_saved_sp stackp temp temp2
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LONG_S \stackp, kernelsp
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.endm
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#endif
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.macro SAVE_SOME
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.set push
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.set noat
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.set reorder
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mfc0 k0, CP0_STATUS
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sll k0, 3 /* extract cu0 bit */
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.set noreorder
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bltz k0, 8f
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move k1, sp
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.set reorder
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/* Called from user mode, new stack. */
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get_saved_sp
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#ifndef CONFIG_CPU_DADDI_WORKAROUNDS
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8: move k0, sp
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PTR_SUBU sp, k1, PT_SIZE
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#else
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.set at=k0
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8: PTR_SUBU k1, PT_SIZE
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.set noat
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move k0, sp
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move sp, k1
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#endif
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LONG_S k0, PT_R29(sp)
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LONG_S $3, PT_R3(sp)
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/*
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* You might think that you don't need to save $0,
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* but the FPU emulator and gdb remote debug stub
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* need it to operate correctly
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*/
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LONG_S $0, PT_R0(sp)
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mfc0 v1, CP0_STATUS
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LONG_S $2, PT_R2(sp)
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#ifdef CONFIG_MIPS_MT_SMTC
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/*
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* Ideally, these instructions would be shuffled in
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* to cover the pipeline delay.
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*/
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.set mips32
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mfc0 k0, CP0_TCSTATUS
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.set mips0
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LONG_S k0, PT_TCSTATUS(sp)
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#endif /* CONFIG_MIPS_MT_SMTC */
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LONG_S $4, PT_R4(sp)
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LONG_S $5, PT_R5(sp)
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LONG_S v1, PT_STATUS(sp)
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mfc0 v1, CP0_CAUSE
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LONG_S $6, PT_R6(sp)
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LONG_S $7, PT_R7(sp)
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LONG_S v1, PT_CAUSE(sp)
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MFC0 v1, CP0_EPC
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#ifdef CONFIG_64BIT
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LONG_S $8, PT_R8(sp)
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LONG_S $9, PT_R9(sp)
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#endif
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LONG_S $25, PT_R25(sp)
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LONG_S $28, PT_R28(sp)
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LONG_S $31, PT_R31(sp)
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LONG_S v1, PT_EPC(sp)
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ori $28, sp, _THREAD_MASK
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xori $28, _THREAD_MASK
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#ifdef CONFIG_CPU_CAVIUM_OCTEON
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.set mips64
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pref 0, 0($28) /* Prefetch the current pointer */
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pref 0, PT_R31(sp) /* Prefetch the $31(ra) */
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/* The Octeon multiplier state is affected by general multiply
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instructions. It must be saved before and kernel code might
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corrupt it */
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jal octeon_mult_save
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LONG_L v1, 0($28) /* Load the current pointer */
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/* Restore $31(ra) that was changed by the jal */
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LONG_L ra, PT_R31(sp)
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pref 0, 0(v1) /* Prefetch the current thread */
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#endif
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.set pop
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.endm
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.macro SAVE_ALL
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SAVE_SOME
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SAVE_AT
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SAVE_TEMP
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SAVE_STATIC
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.endm
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.macro RESTORE_AT
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.set push
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.set noat
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LONG_L $1, PT_R1(sp)
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.set pop
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.endm
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.macro RESTORE_TEMP
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#ifdef CONFIG_CPU_HAS_SMARTMIPS
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LONG_L $24, PT_ACX(sp)
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mtlhx $24
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LONG_L $24, PT_HI(sp)
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mtlhx $24
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LONG_L $24, PT_LO(sp)
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mtlhx $24
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#else
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LONG_L $24, PT_LO(sp)
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mtlo $24
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LONG_L $24, PT_HI(sp)
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mthi $24
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#endif
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#ifdef CONFIG_32BIT
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LONG_L $8, PT_R8(sp)
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LONG_L $9, PT_R9(sp)
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#endif
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LONG_L $10, PT_R10(sp)
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LONG_L $11, PT_R11(sp)
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LONG_L $12, PT_R12(sp)
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LONG_L $13, PT_R13(sp)
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LONG_L $14, PT_R14(sp)
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LONG_L $15, PT_R15(sp)
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LONG_L $24, PT_R24(sp)
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.endm
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.macro RESTORE_STATIC
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LONG_L $16, PT_R16(sp)
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LONG_L $17, PT_R17(sp)
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LONG_L $18, PT_R18(sp)
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LONG_L $19, PT_R19(sp)
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LONG_L $20, PT_R20(sp)
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LONG_L $21, PT_R21(sp)
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LONG_L $22, PT_R22(sp)
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LONG_L $23, PT_R23(sp)
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LONG_L $30, PT_R30(sp)
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.endm
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#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
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.macro RESTORE_SOME
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.set push
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.set reorder
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.set noat
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mfc0 a0, CP0_STATUS
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li v1, 0xff00
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ori a0, STATMASK
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xori a0, STATMASK
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mtc0 a0, CP0_STATUS
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and a0, v1
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LONG_L v0, PT_STATUS(sp)
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nor v1, $0, v1
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and v0, v1
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or v0, a0
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mtc0 v0, CP0_STATUS
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LONG_L $31, PT_R31(sp)
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LONG_L $28, PT_R28(sp)
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LONG_L $25, PT_R25(sp)
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LONG_L $7, PT_R7(sp)
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LONG_L $6, PT_R6(sp)
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LONG_L $5, PT_R5(sp)
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LONG_L $4, PT_R4(sp)
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LONG_L $3, PT_R3(sp)
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LONG_L $2, PT_R2(sp)
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.set pop
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.endm
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.macro RESTORE_SP_AND_RET
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.set push
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.set noreorder
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LONG_L k0, PT_EPC(sp)
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LONG_L sp, PT_R29(sp)
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jr k0
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rfe
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.set pop
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.endm
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#else
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.macro RESTORE_SOME
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.set push
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.set reorder
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.set noat
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#ifdef CONFIG_MIPS_MT_SMTC
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.set mips32r2
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/*
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* We need to make sure the read-modify-write
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* of Status below isn't perturbed by an interrupt
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* or cross-TC access, so we need to do at least a DMT,
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* protected by an interrupt-inhibit. But setting IXMT
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* also creates a few-cycle window where an IPI could
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* be queued and not be detected before potentially
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* returning to a WAIT or user-mode loop. It must be
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* replayed.
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*
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* We're in the middle of a context switch, and
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* we can't dispatch it directly without trashing
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* some registers, so we'll try to detect this unlikely
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* case and program a software interrupt in the VPE,
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* as would be done for a cross-VPE IPI. To accommodate
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* the handling of that case, we're doing a DVPE instead
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* of just a DMT here to protect against other threads.
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* This is a lot of cruft to cover a tiny window.
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* If you can find a better design, implement it!
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*
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*/
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mfc0 v0, CP0_TCSTATUS
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ori v0, TCSTATUS_IXMT
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mtc0 v0, CP0_TCSTATUS
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_ehb
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DVPE 5 # dvpe a1
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jal mips_ihb
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#endif /* CONFIG_MIPS_MT_SMTC */
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#ifdef CONFIG_CPU_CAVIUM_OCTEON
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/* Restore the Octeon multiplier state */
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jal octeon_mult_restore
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#endif
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mfc0 a0, CP0_STATUS
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ori a0, STATMASK
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xori a0, STATMASK
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mtc0 a0, CP0_STATUS
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li v1, 0xff00
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and a0, v1
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LONG_L v0, PT_STATUS(sp)
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nor v1, $0, v1
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and v0, v1
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or v0, a0
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mtc0 v0, CP0_STATUS
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#ifdef CONFIG_MIPS_MT_SMTC
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/*
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* Only after EXL/ERL have been restored to status can we
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* restore TCStatus.IXMT.
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*/
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LONG_L v1, PT_TCSTATUS(sp)
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_ehb
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mfc0 a0, CP0_TCSTATUS
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andi v1, TCSTATUS_IXMT
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bnez v1, 0f
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/*
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* We'd like to detect any IPIs queued in the tiny window
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* above and request an software interrupt to service them
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* when we ERET.
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*
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* Computing the offset into the IPIQ array of the executing
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* TC's IPI queue in-line would be tedious. We use part of
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* the TCContext register to hold 16 bits of offset that we
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* can add in-line to find the queue head.
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*/
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mfc0 v0, CP0_TCCONTEXT
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la a2, IPIQ
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srl v0, v0, 16
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addu a2, a2, v0
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LONG_L v0, 0(a2)
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beqz v0, 0f
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/*
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* If we have a queue, provoke dispatch within the VPE by setting C_SW1
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*/
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mfc0 v0, CP0_CAUSE
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ori v0, v0, C_SW1
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mtc0 v0, CP0_CAUSE
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0:
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/*
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* This test should really never branch but
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* let's be prudent here. Having atomized
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* the shared register modifications, we can
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* now EVPE, and must do so before interrupts
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* are potentially re-enabled.
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*/
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andi a1, a1, MVPCONTROL_EVP
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beqz a1, 1f
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evpe
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1:
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/* We know that TCStatua.IXMT should be set from above */
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xori a0, a0, TCSTATUS_IXMT
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or a0, a0, v1
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mtc0 a0, CP0_TCSTATUS
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_ehb
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.set mips0
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#endif /* CONFIG_MIPS_MT_SMTC */
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LONG_L v1, PT_EPC(sp)
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MTC0 v1, CP0_EPC
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LONG_L $31, PT_R31(sp)
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LONG_L $28, PT_R28(sp)
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LONG_L $25, PT_R25(sp)
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#ifdef CONFIG_64BIT
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LONG_L $8, PT_R8(sp)
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LONG_L $9, PT_R9(sp)
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#endif
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LONG_L $7, PT_R7(sp)
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LONG_L $6, PT_R6(sp)
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LONG_L $5, PT_R5(sp)
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LONG_L $4, PT_R4(sp)
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LONG_L $3, PT_R3(sp)
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LONG_L $2, PT_R2(sp)
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.set pop
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.endm
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.macro RESTORE_SP_AND_RET
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LONG_L sp, PT_R29(sp)
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.set mips3
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eret
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.set mips0
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.endm
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#endif
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.macro RESTORE_SP
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LONG_L sp, PT_R29(sp)
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.endm
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.macro RESTORE_ALL
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RESTORE_TEMP
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RESTORE_STATIC
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RESTORE_AT
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RESTORE_SOME
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RESTORE_SP
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.endm
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.macro RESTORE_ALL_AND_RET
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RESTORE_TEMP
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RESTORE_STATIC
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RESTORE_AT
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RESTORE_SOME
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RESTORE_SP_AND_RET
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.endm
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/*
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* Move to kernel mode and disable interrupts.
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* Set cp0 enable bit as sign that we're running on the kernel stack
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*/
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.macro CLI
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#if !defined(CONFIG_MIPS_MT_SMTC)
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mfc0 t0, CP0_STATUS
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li t1, ST0_CU0 | STATMASK
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or t0, t1
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xori t0, STATMASK
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mtc0 t0, CP0_STATUS
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#else /* CONFIG_MIPS_MT_SMTC */
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/*
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* For SMTC, we need to set privilege
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* and disable interrupts only for the
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* current TC, using the TCStatus register.
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*/
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mfc0 t0, CP0_TCSTATUS
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/* Fortunately CU 0 is in the same place in both registers */
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/* Set TCU0, TMX, TKSU (for later inversion) and IXMT */
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li t1, ST0_CU0 | 0x08001c00
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or t0, t1
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/* Clear TKSU, leave IXMT */
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xori t0, 0x00001800
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mtc0 t0, CP0_TCSTATUS
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_ehb
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/* We need to leave the global IE bit set, but clear EXL...*/
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mfc0 t0, CP0_STATUS
|
|
ori t0, ST0_EXL | ST0_ERL
|
|
xori t0, ST0_EXL | ST0_ERL
|
|
mtc0 t0, CP0_STATUS
|
|
#endif /* CONFIG_MIPS_MT_SMTC */
|
|
irq_disable_hazard
|
|
.endm
|
|
|
|
/*
|
|
* Move to kernel mode and enable interrupts.
|
|
* Set cp0 enable bit as sign that we're running on the kernel stack
|
|
*/
|
|
.macro STI
|
|
#if !defined(CONFIG_MIPS_MT_SMTC)
|
|
mfc0 t0, CP0_STATUS
|
|
li t1, ST0_CU0 | STATMASK
|
|
or t0, t1
|
|
xori t0, STATMASK & ~1
|
|
mtc0 t0, CP0_STATUS
|
|
#else /* CONFIG_MIPS_MT_SMTC */
|
|
/*
|
|
* For SMTC, we need to set privilege
|
|
* and enable interrupts only for the
|
|
* current TC, using the TCStatus register.
|
|
*/
|
|
_ehb
|
|
mfc0 t0, CP0_TCSTATUS
|
|
/* Fortunately CU 0 is in the same place in both registers */
|
|
/* Set TCU0, TKSU (for later inversion) and IXMT */
|
|
li t1, ST0_CU0 | 0x08001c00
|
|
or t0, t1
|
|
/* Clear TKSU *and* IXMT */
|
|
xori t0, 0x00001c00
|
|
mtc0 t0, CP0_TCSTATUS
|
|
_ehb
|
|
/* We need to leave the global IE bit set, but clear EXL...*/
|
|
mfc0 t0, CP0_STATUS
|
|
ori t0, ST0_EXL
|
|
xori t0, ST0_EXL
|
|
mtc0 t0, CP0_STATUS
|
|
/* irq_enable_hazard below should expand to EHB for 24K/34K cpus */
|
|
#endif /* CONFIG_MIPS_MT_SMTC */
|
|
irq_enable_hazard
|
|
.endm
|
|
|
|
/*
|
|
* Just move to kernel mode and leave interrupts as they are. Note
|
|
* for the R3000 this means copying the previous enable from IEp.
|
|
* Set cp0 enable bit as sign that we're running on the kernel stack
|
|
*/
|
|
.macro KMODE
|
|
#ifdef CONFIG_MIPS_MT_SMTC
|
|
/*
|
|
* This gets baroque in SMTC. We want to
|
|
* protect the non-atomic clearing of EXL
|
|
* with DMT/EMT, but we don't want to take
|
|
* an interrupt while DMT is still in effect.
|
|
*/
|
|
|
|
/* KMODE gets invoked from both reorder and noreorder code */
|
|
.set push
|
|
.set mips32r2
|
|
.set noreorder
|
|
mfc0 v0, CP0_TCSTATUS
|
|
andi v1, v0, TCSTATUS_IXMT
|
|
ori v0, TCSTATUS_IXMT
|
|
mtc0 v0, CP0_TCSTATUS
|
|
_ehb
|
|
DMT 2 # dmt v0
|
|
/*
|
|
* We don't know a priori if ra is "live"
|
|
*/
|
|
move t0, ra
|
|
jal mips_ihb
|
|
nop /* delay slot */
|
|
move ra, t0
|
|
#endif /* CONFIG_MIPS_MT_SMTC */
|
|
mfc0 t0, CP0_STATUS
|
|
li t1, ST0_CU0 | (STATMASK & ~1)
|
|
#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
|
|
andi t2, t0, ST0_IEP
|
|
srl t2, 2
|
|
or t0, t2
|
|
#endif
|
|
or t0, t1
|
|
xori t0, STATMASK & ~1
|
|
mtc0 t0, CP0_STATUS
|
|
#ifdef CONFIG_MIPS_MT_SMTC
|
|
_ehb
|
|
andi v0, v0, VPECONTROL_TE
|
|
beqz v0, 2f
|
|
nop /* delay slot */
|
|
emt
|
|
2:
|
|
mfc0 v0, CP0_TCSTATUS
|
|
/* Clear IXMT, then OR in previous value */
|
|
ori v0, TCSTATUS_IXMT
|
|
xori v0, TCSTATUS_IXMT
|
|
or v0, v1, v0
|
|
mtc0 v0, CP0_TCSTATUS
|
|
/*
|
|
* irq_disable_hazard below should expand to EHB
|
|
* on 24K/34K CPUS
|
|
*/
|
|
.set pop
|
|
#endif /* CONFIG_MIPS_MT_SMTC */
|
|
irq_disable_hazard
|
|
.endm
|
|
|
|
#endif /* _ASM_STACKFRAME_H */
|