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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/nios2/include/asm/entry.h
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/*

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 * Copyright (C) 2010 Tobias Klauser <[email protected]>

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 * Copyright (C) 2004 Microtronix Datacom Ltd.

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 *

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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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#ifndef _ASM_NIOS2_ENTRY_H

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#define _ASM_NIOS2_ENTRY_H

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#ifdef __ASSEMBLY__

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#include <asm/processor.h>

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#include <asm/registers.h>

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#include <asm/asm-offsets.h>

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/*

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 * Standard Nios2 interrupt entry and exit macros.

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 * Must be called with interrupts disabled.

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 */

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.macro SAVE_ALL

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	rdctl	r24, estatus

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	andi	r24, r24, ESTATUS_EU

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	beq	r24, r0, 1f /* In supervisor mode, already on kernel stack */

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	movia	r24, _current_thread	/* Switch to current kernel stack */

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	ldw	r24, 0(r24)		/* using the thread_info */

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	addi	r24, r24, THREAD_SIZE-PT_REGS_SIZE

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	stw	sp, PT_SP(r24)		/* Save user stack before changing */

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	mov	sp, r24

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	br	2f

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1 :	mov	r24, sp

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	addi	sp, sp, -PT_REGS_SIZE	/* Backup the kernel stack pointer */

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	stw	r24, PT_SP(sp)

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2 :	stw	r1, PT_R1(sp)

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	stw	r2, PT_R2(sp)

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	stw	r3, PT_R3(sp)

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	stw	r4, PT_R4(sp)

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	stw	r5, PT_R5(sp)

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	stw	r6, PT_R6(sp)

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	stw	r7, PT_R7(sp)

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	stw	r8, PT_R8(sp)

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	stw	r9, PT_R9(sp)

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	stw	r10, PT_R10(sp)

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	stw	r11, PT_R11(sp)

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	stw	r12, PT_R12(sp)

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	stw	r13, PT_R13(sp)

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	stw	r14, PT_R14(sp)

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	stw	r15, PT_R15(sp)

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	movi	r24, -1

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	stw	r24, PT_ORIG_R2(sp)

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	stw	r7, PT_ORIG_R7(sp)

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	stw	ra, PT_RA(sp)

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	stw	fp, PT_FP(sp)

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	stw	gp, PT_GP(sp)

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	rdctl	r24, estatus

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	stw	r24, PT_ESTATUS(sp)

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	stw	ea, PT_EA(sp)

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.endm

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.macro RESTORE_ALL

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	ldw	r1, PT_R1(sp)		/* Restore registers */

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	ldw	r2, PT_R2(sp)

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	ldw	r3, PT_R3(sp)

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	ldw	r4, PT_R4(sp)

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	ldw	r5, PT_R5(sp)

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	ldw	r6, PT_R6(sp)

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	ldw	r7, PT_R7(sp)

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	ldw	r8, PT_R8(sp)

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	ldw	r9, PT_R9(sp)

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	ldw	r10, PT_R10(sp)

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	ldw	r11, PT_R11(sp)

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	ldw	r12, PT_R12(sp)

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	ldw	r13, PT_R13(sp)

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	ldw	r14, PT_R14(sp)

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	ldw	r15, PT_R15(sp)

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	ldw	ra, PT_RA(sp)

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	ldw	fp, PT_FP(sp)

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	ldw	gp, PT_GP(sp)

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	ldw	r24, PT_ESTATUS(sp)

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	wrctl	estatus, r24

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	ldw	ea, PT_EA(sp)

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	ldw	sp, PT_SP(sp)		/* Restore sp last */

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.endm

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.macro	SAVE_SWITCH_STACK

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	addi	sp, sp, -SWITCH_STACK_SIZE

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	stw	r16, SW_R16(sp)

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	stw	r17, SW_R17(sp)

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	stw	r18, SW_R18(sp)

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	stw	r19, SW_R19(sp)

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	stw	r20, SW_R20(sp)

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	stw	r21, SW_R21(sp)

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	stw	r22, SW_R22(sp)

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	stw	r23, SW_R23(sp)

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	stw	fp, SW_FP(sp)

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	stw	gp, SW_GP(sp)

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	stw	ra, SW_RA(sp)

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.endm

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.macro	RESTORE_SWITCH_STACK

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	ldw	r16, SW_R16(sp)

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	ldw	r17, SW_R17(sp)

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	ldw	r18, SW_R18(sp)

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	ldw	r19, SW_R19(sp)

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	ldw	r20, SW_R20(sp)

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	ldw	r21, SW_R21(sp)

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	ldw	r22, SW_R22(sp)

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	ldw	r23, SW_R23(sp)

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	ldw	fp, SW_FP(sp)

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	ldw	gp, SW_GP(sp)

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	ldw	ra, SW_RA(sp)

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	addi	sp, sp, SWITCH_STACK_SIZE

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.endm

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#endif /* __ASSEMBLY__ */

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#endif /* _ASM_NIOS2_ENTRY_H */

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