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Diffstat (limited to 'include/asm-mips/stackframe.h')
| -rw-r--r-- | include/asm-mips/stackframe.h | 574 |
1 files changed, 0 insertions, 574 deletions
diff --git a/include/asm-mips/stackframe.h b/include/asm-mips/stackframe.h deleted file mode 100644 index 4c37c4e5f72e..000000000000 --- a/include/asm-mips/stackframe.h +++ /dev/null @@ -1,574 +0,0 @@ -/* - * 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. - * Copyright (C) 2007 Maciej W. Rozycki - */ -#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> - -/* - * For SMTC kernel, global IE should be left set, and interrupts - * controlled exclusively via IXMT. - */ -#ifdef CONFIG_MIPS_MT_SMTC -#define STATMASK 0x1e -#elif defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX) -#define STATMASK 0x3f -#else -#define STATMASK 0x1f -#endif - -#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 -#ifdef CONFIG_CPU_HAS_SMARTMIPS - mflhxu v1 - LONG_S v1, PT_LO(sp) - mflhxu v1 - LONG_S v1, PT_HI(sp) - mflhxu v1 - LONG_S v1, PT_ACX(sp) -#else - mfhi v1 - LONG_S v1, PT_HI(sp) - mflo v1 - LONG_S v1, PT_LO(sp) -#endif -#ifdef CONFIG_32BIT - LONG_S $8, PT_R8(sp) - LONG_S $9, PT_R9(sp) -#endif - LONG_S $10, PT_R10(sp) - LONG_S $11, PT_R11(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_32BIT) || defined(KBUILD_64BIT_SYM32) - lui k1, %hi(kernelsp) -#else - lui k1, %highest(kernelsp) - daddiu k1, %higher(kernelsp) - dsll k1, 16 - daddiu k1, %hi(kernelsp) - dsll k1, 16 -#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_32BIT) || defined(KBUILD_64BIT_SYM32) - lui k1, %hi(kernelsp) -#else - lui k1, %highest(kernelsp) - daddiu k1, %higher(kernelsp) - dsll k1, k1, 16 - daddiu k1, %hi(kernelsp) - dsll k1, k1, 16 -#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 -#ifndef CONFIG_CPU_DADDI_WORKAROUNDS -8: move k0, sp - PTR_SUBU sp, k1, PT_SIZE -#else - .set at=k0 -8: PTR_SUBU k1, PT_SIZE - .set noat - move k0, sp - move sp, k1 -#endif - 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 -#ifdef CONFIG_CPU_HAS_SMARTMIPS - LONG_L $24, PT_ACX(sp) - mtlhx $24 - LONG_L $24, PT_HI(sp) - mtlhx $24 - LONG_L $24, PT_LO(sp) - mtlhx $24 -#else - LONG_L $24, PT_LO(sp) - mtlo $24 - LONG_L $24, PT_HI(sp) - mthi $24 -#endif -#ifdef CONFIG_32BIT - LONG_L $8, PT_R8(sp) - LONG_L $9, PT_R9(sp) -#endif - LONG_L $10, PT_R10(sp) - LONG_L $11, PT_R11(sp) - 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 - li v1, 0xff00 - ori a0, STATMASK - xori a0, STATMASK - mtc0 a0, CP0_STATUS - 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) - 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 - .macro RESTORE_SOME - .set push - .set reorder - .set noat -#ifdef CONFIG_MIPS_MT_SMTC - .set mips32r2 - /* - * We need to make sure the read-modify-write - * of Status below isn't perturbed by an interrupt - * or cross-TC access, so we need to do at least a DMT, - * protected by an interrupt-inhibit. But setting IXMT - * also creates a few-cycle window where an IPI could - * be queued and not be detected before potentially - * returning to a WAIT or user-mode loop. It must be - * replayed. - * - * We're in the middle of a context switch, and - * we can't dispatch it directly without trashing - * some registers, so we'll try to detect this unlikely - * case and program a software interrupt in the VPE, - * as would be done for a cross-VPE IPI. To accomodate - * the handling of that case, we're doing a DVPE instead - * of just a DMT here to protect against other threads. - * This is a lot of cruft to cover a tiny window. - * If you can find a better design, implement it! - * - */ - mfc0 v0, CP0_TCSTATUS - ori v0, TCSTATUS_IXMT - mtc0 v0, CP0_TCSTATUS - _ehb - DVPE 5 # dvpe 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 a0, CP0_TCSTATUS - andi v1, TCSTATUS_IXMT - bnez v1, 0f - -/* - * We'd like to detect any IPIs queued in the tiny window - * above and request an software interrupt to service them - * when we ERET. - * - * Computing the offset into the IPIQ array of the executing - * TC's IPI queue in-line would be tedious. We use part of - * the TCContext register to hold 16 bits of offset that we - * can add in-line to find the queue head. - */ - mfc0 v0, CP0_TCCONTEXT - la a2, IPIQ - srl v0, v0, 16 - addu a2, a2, v0 - LONG_L v0, 0(a2) - beqz v0, 0f -/* - * If we have a queue, provoke dispatch within the VPE by setting C_SW1 - */ - mfc0 v0, CP0_CAUSE - ori v0, v0, C_SW1 - mtc0 v0, CP0_CAUSE -0: - /* - * This test should really never branch but - * let's be prudent here. Having atomized - * the shared register modifications, we can - * now EVPE, and must do so before interrupts - * are potentially re-enabled. - */ - andi a1, a1, MVPCONTROL_EVP - beqz a1, 1f - evpe -1: - /* We know that TCStatua.IXMT should be set from above */ - xori a0, a0, TCSTATUS_IXMT - or a0, a0, v1 - mtc0 a0, CP0_TCSTATUS - _ehb - - .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 | STATMASK - or t0, t1 - xori t0, STATMASK - 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 | 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 */ |