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/* * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch> * Copyright (C) 2004 Microtronix Datacom Ltd. * * 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. */ #ifndef _ASM_NIOS2_ENTRY_H #define _ASM_NIOS2_ENTRY_H #ifdef __ASSEMBLY__ #include <asm/processor.h> #include <asm/registers.h> #include <asm/asm-offsets.h> /* * Standard Nios2 interrupt entry and exit macros. * Must be called with interrupts disabled. */ .macro SAVE_ALL rdctl r24, estatus andi r24, r24, ESTATUS_EU beq r24, r0, 1f /* In supervisor mode, already on kernel stack */ movia r24, _current_thread /* Switch to current kernel stack */ ldw r24, 0(r24) /* using the thread_info */ addi r24, r24, THREAD_SIZE-PT_REGS_SIZE stw sp, PT_SP(r24) /* Save user stack before changing */ mov sp, r24 br 2f 1 : mov r24, sp addi sp, sp, -PT_REGS_SIZE /* Backup the kernel stack pointer */ stw r24, PT_SP(sp) 2 : stw r1, PT_R1(sp) stw r2, PT_R2(sp) stw r3, PT_R3(sp) stw r4, PT_R4(sp) stw r5, PT_R5(sp) stw r6, PT_R6(sp) stw r7, PT_R7(sp) stw r8, PT_R8(sp) stw r9, PT_R9(sp) stw r10, PT_R10(sp) stw r11, PT_R11(sp) stw r12, PT_R12(sp) stw r13, PT_R13(sp) stw r14, PT_R14(sp) stw r15, PT_R15(sp) movi r24, -1 stw r24, PT_ORIG_R2(sp) stw r7, PT_ORIG_R7(sp) stw ra, PT_RA(sp) stw fp, PT_FP(sp) stw gp, PT_GP(sp) rdctl r24, estatus stw r24, PT_ESTATUS(sp) stw ea, PT_EA(sp) .endm .macro RESTORE_ALL ldw r1, PT_R1(sp) /* Restore registers */ ldw r2, PT_R2(sp) ldw r3, PT_R3(sp) ldw r4, PT_R4(sp) ldw r5, PT_R5(sp) ldw r6, PT_R6(sp) ldw r7, PT_R7(sp) ldw r8, PT_R8(sp) ldw r9, PT_R9(sp) ldw r10, PT_R10(sp) ldw r11, PT_R11(sp) ldw r12, PT_R12(sp) ldw r13, PT_R13(sp) ldw r14, PT_R14(sp) ldw r15, PT_R15(sp) ldw ra, PT_RA(sp) ldw fp, PT_FP(sp) ldw gp, PT_GP(sp) ldw r24, PT_ESTATUS(sp) wrctl estatus, r24 ldw ea, PT_EA(sp) ldw sp, PT_SP(sp) /* Restore sp last */ .endm .macro SAVE_SWITCH_STACK addi sp, sp, -SWITCH_STACK_SIZE stw r16, SW_R16(sp) stw r17, SW_R17(sp) stw r18, SW_R18(sp) stw r19, SW_R19(sp) stw r20, SW_R20(sp) stw r21, SW_R21(sp) stw r22, SW_R22(sp) stw r23, SW_R23(sp) stw fp, SW_FP(sp) stw gp, SW_GP(sp) stw ra, SW_RA(sp) .endm .macro RESTORE_SWITCH_STACK ldw r16, SW_R16(sp) ldw r17, SW_R17(sp) ldw r18, SW_R18(sp) ldw r19, SW_R19(sp) ldw r20, SW_R20(sp) ldw r21, SW_R21(sp) ldw r22, SW_R22(sp) ldw r23, SW_R23(sp) ldw fp, SW_FP(sp) ldw gp, SW_GP(sp) ldw ra, SW_RA(sp) addi sp, sp, SWITCH_STACK_SIZE .endm #endif /* __ASSEMBLY__ */ #endif /* _ASM_NIOS2_ENTRY_H */