| /* |
| * 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, 95, 96, 99, 2001 Ralf Baechle |
| * Copyright (C) 1994, 1995, 1996 Paul M. Antoine. |
| * Copyright (C) 1999 Silicon Graphics, Inc. |
| */ |
| #ifndef _ASM_STACKFRAME_H |
| #define _ASM_STACKFRAME_H |
| |
| #include <linux/threads.h> |
| |
| #include <asm/asm.h> |
| #include <asm/asmmacro.h> |
| #include <asm/mipsregs.h> |
| #include <asm/asm-offsets.h> |
| |
| #ifdef CONFIG_MIPS_MT_SMTC |
| #include <asm/mipsmtregs.h> |
| #endif /* CONFIG_MIPS_MT_SMTC */ |
| |
| .macro SAVE_AT |
| .set push |
| .set noat |
| LONG_S $1, PT_R1(sp) |
| .set pop |
| .endm |
| |
| .macro SAVE_TEMP |
| mfhi v1 |
| #ifdef CONFIG_32BIT |
| LONG_S $8, PT_R8(sp) |
| LONG_S $9, PT_R9(sp) |
| #endif |
| LONG_S v1, PT_HI(sp) |
| mflo v1 |
| LONG_S $10, PT_R10(sp) |
| LONG_S $11, PT_R11(sp) |
| LONG_S v1, PT_LO(sp) |
| LONG_S $12, PT_R12(sp) |
| LONG_S $13, PT_R13(sp) |
| LONG_S $14, PT_R14(sp) |
| LONG_S $15, PT_R15(sp) |
| LONG_S $24, PT_R24(sp) |
| .endm |
| |
| .macro SAVE_STATIC |
| LONG_S $16, PT_R16(sp) |
| LONG_S $17, PT_R17(sp) |
| LONG_S $18, PT_R18(sp) |
| LONG_S $19, PT_R19(sp) |
| LONG_S $20, PT_R20(sp) |
| LONG_S $21, PT_R21(sp) |
| LONG_S $22, PT_R22(sp) |
| LONG_S $23, PT_R23(sp) |
| LONG_S $30, PT_R30(sp) |
| .endm |
| |
| #ifdef CONFIG_SMP |
| #ifdef CONFIG_MIPS_MT_SMTC |
| #define PTEBASE_SHIFT 19 /* TCBIND */ |
| #else |
| #define PTEBASE_SHIFT 23 /* CONTEXT */ |
| #endif |
| .macro get_saved_sp /* SMP variation */ |
| #ifdef CONFIG_MIPS_MT_SMTC |
| mfc0 k0, CP0_TCBIND |
| #else |
| MFC0 k0, CP0_CONTEXT |
| #endif |
| #if defined(CONFIG_BUILD_ELF64) || (defined(CONFIG_64BIT) && __GNUC__ < 4) |
| lui k1, %highest(kernelsp) |
| daddiu k1, %higher(kernelsp) |
| dsll k1, 16 |
| daddiu k1, %hi(kernelsp) |
| dsll k1, 16 |
| #else |
| lui k1, %hi(kernelsp) |
| #endif |
| LONG_SRL k0, PTEBASE_SHIFT |
| LONG_ADDU k1, k0 |
| LONG_L k1, %lo(kernelsp)(k1) |
| .endm |
| |
| .macro set_saved_sp stackp temp temp2 |
| #ifdef CONFIG_MIPS_MT_SMTC |
| mfc0 \temp, CP0_TCBIND |
| #else |
| MFC0 \temp, CP0_CONTEXT |
| #endif |
| LONG_SRL \temp, PTEBASE_SHIFT |
| LONG_S \stackp, kernelsp(\temp) |
| .endm |
| #else |
| .macro get_saved_sp /* Uniprocessor variation */ |
| #if defined(CONFIG_BUILD_ELF64) || (defined(CONFIG_64BIT) && __GNUC__ < 4) |
| lui k1, %highest(kernelsp) |
| daddiu k1, %higher(kernelsp) |
| dsll k1, k1, 16 |
| daddiu k1, %hi(kernelsp) |
| dsll k1, k1, 16 |
| #else |
| lui k1, %hi(kernelsp) |
| #endif |
| LONG_L k1, %lo(kernelsp)(k1) |
| .endm |
| |
| .macro set_saved_sp stackp temp temp2 |
| LONG_S \stackp, kernelsp |
| .endm |
| #endif |
| |
| .macro SAVE_SOME |
| .set push |
| .set noat |
| .set reorder |
| mfc0 k0, CP0_STATUS |
| sll k0, 3 /* extract cu0 bit */ |
| .set noreorder |
| bltz k0, 8f |
| move k1, sp |
| .set reorder |
| /* Called from user mode, new stack. */ |
| get_saved_sp |
| 8: move k0, sp |
| PTR_SUBU sp, k1, PT_SIZE |
| LONG_S k0, PT_R29(sp) |
| LONG_S $3, PT_R3(sp) |
| /* |
| * You might think that you don't need to save $0, |
| * but the FPU emulator and gdb remote debug stub |
| * need it to operate correctly |
| */ |
| LONG_S $0, PT_R0(sp) |
| mfc0 v1, CP0_STATUS |
| LONG_S $2, PT_R2(sp) |
| LONG_S v1, PT_STATUS(sp) |
| #ifdef CONFIG_MIPS_MT_SMTC |
| /* |
| * Ideally, these instructions would be shuffled in |
| * to cover the pipeline delay. |
| */ |
| .set mips32 |
| mfc0 v1, CP0_TCSTATUS |
| .set mips0 |
| LONG_S v1, PT_TCSTATUS(sp) |
| #endif /* CONFIG_MIPS_MT_SMTC */ |
| LONG_S $4, PT_R4(sp) |
| mfc0 v1, CP0_CAUSE |
| LONG_S $5, PT_R5(sp) |
| LONG_S v1, PT_CAUSE(sp) |
| LONG_S $6, PT_R6(sp) |
| MFC0 v1, CP0_EPC |
| LONG_S $7, PT_R7(sp) |
| #ifdef CONFIG_64BIT |
| LONG_S $8, PT_R8(sp) |
| LONG_S $9, PT_R9(sp) |
| #endif |
| LONG_S v1, PT_EPC(sp) |
| LONG_S $25, PT_R25(sp) |
| LONG_S $28, PT_R28(sp) |
| LONG_S $31, PT_R31(sp) |
| ori $28, sp, _THREAD_MASK |
| xori $28, _THREAD_MASK |
| .set pop |
| .endm |
| |
| .macro SAVE_ALL |
| SAVE_SOME |
| SAVE_AT |
| SAVE_TEMP |
| SAVE_STATIC |
| .endm |
| |
| .macro RESTORE_AT |
| .set push |
| .set noat |
| LONG_L $1, PT_R1(sp) |
| .set pop |
| .endm |
| |
| .macro RESTORE_TEMP |
| LONG_L $24, PT_LO(sp) |
| #ifdef CONFIG_32BIT |
| LONG_L $8, PT_R8(sp) |
| LONG_L $9, PT_R9(sp) |
| #endif |
| mtlo $24 |
| LONG_L $24, PT_HI(sp) |
| LONG_L $10, PT_R10(sp) |
| LONG_L $11, PT_R11(sp) |
| mthi $24 |
| LONG_L $12, PT_R12(sp) |
| LONG_L $13, PT_R13(sp) |
| LONG_L $14, PT_R14(sp) |
| LONG_L $15, PT_R15(sp) |
| LONG_L $24, PT_R24(sp) |
| .endm |
| |
| .macro RESTORE_STATIC |
| LONG_L $16, PT_R16(sp) |
| LONG_L $17, PT_R17(sp) |
| LONG_L $18, PT_R18(sp) |
| LONG_L $19, PT_R19(sp) |
| LONG_L $20, PT_R20(sp) |
| LONG_L $21, PT_R21(sp) |
| LONG_L $22, PT_R22(sp) |
| LONG_L $23, PT_R23(sp) |
| LONG_L $30, PT_R30(sp) |
| .endm |
| |
| #if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX) |
| |
| .macro RESTORE_SOME |
| .set push |
| .set reorder |
| .set noat |
| mfc0 a0, CP0_STATUS |
| ori a0, 0x1f |
| xori a0, 0x1f |
| mtc0 a0, CP0_STATUS |
| li v1, 0xff00 |
| and a0, v1 |
| LONG_L v0, PT_STATUS(sp) |
| nor v1, $0, v1 |
| and v0, v1 |
| or v0, a0 |
| mtc0 v0, CP0_STATUS |
| LONG_L $31, PT_R31(sp) |
| LONG_L $28, PT_R28(sp) |
| LONG_L $25, PT_R25(sp) |
| #ifdef CONFIG_64BIT |
| LONG_L $8, PT_R8(sp) |
| LONG_L $9, PT_R9(sp) |
| #endif |
| LONG_L $7, PT_R7(sp) |
| LONG_L $6, PT_R6(sp) |
| LONG_L $5, PT_R5(sp) |
| LONG_L $4, PT_R4(sp) |
| LONG_L $3, PT_R3(sp) |
| LONG_L $2, PT_R2(sp) |
| .set pop |
| .endm |
| |
| .macro RESTORE_SP_AND_RET |
| .set push |
| .set noreorder |
| LONG_L k0, PT_EPC(sp) |
| LONG_L sp, PT_R29(sp) |
| jr k0 |
| rfe |
| .set pop |
| .endm |
| |
| #else |
| /* |
| * For SMTC kernel, global IE should be left set, and interrupts |
| * controlled exclusively via IXMT. |
| */ |
| |
| #ifdef CONFIG_MIPS_MT_SMTC |
| #define STATMASK 0x1e |
| #else |
| #define STATMASK 0x1f |
| #endif |
| .macro RESTORE_SOME |
| .set push |
| .set reorder |
| .set noat |
| #ifdef CONFIG_MIPS_MT_SMTC |
| .set mips32r2 |
| /* |
| * This may not really be necessary if ints are already |
| * inhibited here. |
| */ |
| mfc0 v0, CP0_TCSTATUS |
| ori v0, TCSTATUS_IXMT |
| mtc0 v0, CP0_TCSTATUS |
| _ehb |
| DMT 5 # dmt a1 |
| jal mips_ihb |
| #endif /* CONFIG_MIPS_MT_SMTC */ |
| mfc0 a0, CP0_STATUS |
| ori a0, STATMASK |
| xori a0, STATMASK |
| mtc0 a0, CP0_STATUS |
| li v1, 0xff00 |
| and a0, v1 |
| LONG_L v0, PT_STATUS(sp) |
| nor v1, $0, v1 |
| and v0, v1 |
| or v0, a0 |
| mtc0 v0, CP0_STATUS |
| #ifdef CONFIG_MIPS_MT_SMTC |
| /* |
| * Only after EXL/ERL have been restored to status can we |
| * restore TCStatus.IXMT. |
| */ |
| LONG_L v1, PT_TCSTATUS(sp) |
| _ehb |
| mfc0 v0, CP0_TCSTATUS |
| andi v1, TCSTATUS_IXMT |
| /* We know that TCStatua.IXMT should be set from above */ |
| xori v0, v0, TCSTATUS_IXMT |
| or v0, v0, v1 |
| mtc0 v0, CP0_TCSTATUS |
| _ehb |
| andi a1, a1, VPECONTROL_TE |
| beqz a1, 1f |
| emt |
| 1: |
| .set mips0 |
| #endif /* CONFIG_MIPS_MT_SMTC */ |
| LONG_L v1, PT_EPC(sp) |
| MTC0 v1, CP0_EPC |
| LONG_L $31, PT_R31(sp) |
| LONG_L $28, PT_R28(sp) |
| LONG_L $25, PT_R25(sp) |
| #ifdef CONFIG_64BIT |
| LONG_L $8, PT_R8(sp) |
| LONG_L $9, PT_R9(sp) |
| #endif |
| LONG_L $7, PT_R7(sp) |
| LONG_L $6, PT_R6(sp) |
| LONG_L $5, PT_R5(sp) |
| LONG_L $4, PT_R4(sp) |
| LONG_L $3, PT_R3(sp) |
| LONG_L $2, PT_R2(sp) |
| .set pop |
| .endm |
| |
| .macro RESTORE_SP_AND_RET |
| LONG_L sp, PT_R29(sp) |
| .set mips3 |
| eret |
| .set mips0 |
| .endm |
| |
| #endif |
| |
| .macro RESTORE_SP |
| LONG_L sp, PT_R29(sp) |
| .endm |
| |
| .macro RESTORE_ALL |
| RESTORE_TEMP |
| RESTORE_STATIC |
| RESTORE_AT |
| RESTORE_SOME |
| RESTORE_SP |
| .endm |
| |
| .macro RESTORE_ALL_AND_RET |
| RESTORE_TEMP |
| RESTORE_STATIC |
| RESTORE_AT |
| RESTORE_SOME |
| RESTORE_SP_AND_RET |
| .endm |
| |
| /* |
| * Move to kernel mode and disable interrupts. |
| * Set cp0 enable bit as sign that we're running on the kernel stack |
| */ |
| .macro CLI |
| #if !defined(CONFIG_MIPS_MT_SMTC) |
| mfc0 t0, CP0_STATUS |
| li t1, ST0_CU0 | 0x1f |
| or t0, t1 |
| xori t0, 0x1f |
| mtc0 t0, CP0_STATUS |
| #else /* CONFIG_MIPS_MT_SMTC */ |
| /* |
| * For SMTC, we need to set privilege |
| * and disable interrupts only for the |
| * current TC, using the TCStatus register. |
| */ |
| mfc0 t0,CP0_TCSTATUS |
| /* Fortunately CU 0 is in the same place in both registers */ |
| /* Set TCU0, TMX, TKSU (for later inversion) and IXMT */ |
| li t1, ST0_CU0 | 0x08001c00 |
| or t0,t1 |
| /* Clear TKSU, leave IXMT */ |
| xori t0, 0x00001800 |
| 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 | 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 | 0x1f |
| or t0, t1 |
| xori t0, 0x1e |
| 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. |
| * 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 | 0x1e |
| or t0, t1 |
| xori t0, 0x1e |
| 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 */ |
