From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- arch/mips/include/asm/stackframe.h | 407 +++++++++++++++++++++++++++++++++++++ 1 file changed, 407 insertions(+) create mode 100644 arch/mips/include/asm/stackframe.h (limited to 'arch/mips/include/asm/stackframe.h') diff --git a/arch/mips/include/asm/stackframe.h b/arch/mips/include/asm/stackframe.h new file mode 100644 index 000000000..28d6d9364 --- /dev/null +++ b/arch/mips/include/asm/stackframe.h @@ -0,0 +1,407 @@ +/* + * 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 + +#include +#include +#include +#include +#include + +#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX) +#define STATMASK 0x3f +#else +#define STATMASK 0x1f +#endif + + .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) +#elif !defined(CONFIG_CPU_MIPSR6) + mfhi v1 +#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) +#if !defined(CONFIG_CPU_HAS_SMARTMIPS) && !defined(CONFIG_CPU_MIPSR6) + LONG_S v1, PT_HI(sp) + mflo v1 +#endif + LONG_S $13, PT_R13(sp) + LONG_S $14, PT_R14(sp) + LONG_S $15, PT_R15(sp) + LONG_S $24, PT_R24(sp) +#if !defined(CONFIG_CPU_HAS_SMARTMIPS) && !defined(CONFIG_CPU_MIPSR6) + LONG_S v1, PT_LO(sp) +#endif +#ifdef CONFIG_CPU_CAVIUM_OCTEON + /* + * The Octeon multiplier state is affected by general + * multiply instructions. It must be saved before and + * kernel code might corrupt it + */ + jal octeon_mult_save +#endif + .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 + .macro get_saved_sp /* SMP variation */ + ASM_CPUID_MFC0 k0, ASM_SMP_CPUID_REG +#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, SMP_CPUID_PTRSHIFT + LONG_ADDU k1, k0 + LONG_L k1, %lo(kernelsp)(k1) + .endm + + .macro set_saved_sp stackp temp temp2 + ASM_CPUID_MFC0 \temp, ASM_SMP_CPUID_REG + LONG_SRL \temp, SMP_CPUID_PTRSHIFT + LONG_S \stackp, kernelsp(\temp) + .endm +#else /* !CONFIG_SMP */ + .macro get_saved_sp /* Uniprocessor variation */ +#ifdef CONFIG_CPU_JUMP_WORKAROUNDS + /* + * Clear BTB (branch target buffer), forbid RAS (return address + * stack) to workaround the Out-of-order Issue in Loongson2F + * via its diagnostic register. + */ + move k0, ra + jal 1f + nop +1: jal 1f + nop +1: jal 1f + nop +1: jal 1f + nop +1: move ra, k0 + li k0, 3 + mtc0 k0, $22 +#endif /* CONFIG_CPU_JUMP_WORKAROUNDS */ +#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) + 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 +#ifdef CONFIG_CPU_CAVIUM_OCTEON + .set mips64 + pref 0, 0($28) /* Prefetch the current pointer */ +#endif + .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_CAVIUM_OCTEON + /* Restore the Octeon multiplier state */ + jal octeon_mult_restore +#endif +#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 +#elif !defined(CONFIG_CPU_MIPSR6) + 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 + 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 + 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 arch=r4000 + 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 + mfc0 t0, CP0_STATUS + li t1, ST0_CU0 | STATMASK + or t0, t1 + xori t0, STATMASK + mtc0 t0, CP0_STATUS + 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 + mfc0 t0, CP0_STATUS + li t1, ST0_CU0 | STATMASK + or t0, t1 + xori t0, STATMASK & ~1 + mtc0 t0, CP0_STATUS + 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 + 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 + irq_disable_hazard + .endm + +#endif /* _ASM_STACKFRAME_H */ -- cgit v1.2.3-54-g00ecf