| Ley Foon Tan | 27d2241 | 2014-11-06 15:19:37 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch> |
| 3 | * Copyright (C) 2004 Microtronix Datacom Ltd. |
| 4 | * |
| 5 | * This file is subject to the terms and conditions of the GNU General Public |
| 6 | * License. See the file "COPYING" in the main directory of this archive |
| 7 | * for more details. |
| 8 | */ |
| 9 | |
| 10 | #ifndef _ASM_NIOS2_ENTRY_H |
| 11 | #define _ASM_NIOS2_ENTRY_H |
| 12 | |
| 13 | #ifdef __ASSEMBLY__ |
| 14 | |
| 15 | #include <asm/processor.h> |
| 16 | #include <asm/registers.h> |
| 17 | #include <asm/asm-offsets.h> |
| 18 | |
| 19 | /* |
| 20 | * Standard Nios2 interrupt entry and exit macros. |
| 21 | * Must be called with interrupts disabled. |
| 22 | */ |
| 23 | .macro SAVE_ALL |
| 24 | rdctl r24, estatus |
| 25 | andi r24, r24, ESTATUS_EU |
| 26 | beq r24, r0, 1f /* In supervisor mode, already on kernel stack */ |
| 27 | |
| 28 | movia r24, _current_thread /* Switch to current kernel stack */ |
| 29 | ldw r24, 0(r24) /* using the thread_info */ |
| 30 | addi r24, r24, THREAD_SIZE-PT_REGS_SIZE |
| 31 | stw sp, PT_SP(r24) /* Save user stack before changing */ |
| 32 | mov sp, r24 |
| 33 | br 2f |
| 34 | |
| 35 | 1 : mov r24, sp |
| 36 | addi sp, sp, -PT_REGS_SIZE /* Backup the kernel stack pointer */ |
| 37 | stw r24, PT_SP(sp) |
| 38 | 2 : stw r1, PT_R1(sp) |
| 39 | stw r2, PT_R2(sp) |
| 40 | stw r3, PT_R3(sp) |
| 41 | stw r4, PT_R4(sp) |
| 42 | stw r5, PT_R5(sp) |
| 43 | stw r6, PT_R6(sp) |
| 44 | stw r7, PT_R7(sp) |
| 45 | stw r8, PT_R8(sp) |
| 46 | stw r9, PT_R9(sp) |
| 47 | stw r10, PT_R10(sp) |
| 48 | stw r11, PT_R11(sp) |
| 49 | stw r12, PT_R12(sp) |
| 50 | stw r13, PT_R13(sp) |
| 51 | stw r14, PT_R14(sp) |
| 52 | stw r15, PT_R15(sp) |
| 53 | stw r2, PT_ORIG_R2(sp) |
| 54 | stw r7, PT_ORIG_R7(sp) |
| 55 | |
| 56 | stw ra, PT_RA(sp) |
| 57 | stw fp, PT_FP(sp) |
| 58 | stw gp, PT_GP(sp) |
| 59 | rdctl r24, estatus |
| 60 | stw r24, PT_ESTATUS(sp) |
| 61 | stw ea, PT_EA(sp) |
| 62 | .endm |
| 63 | |
| 64 | .macro RESTORE_ALL |
| 65 | ldw r1, PT_R1(sp) /* Restore registers */ |
| 66 | ldw r2, PT_R2(sp) |
| 67 | ldw r3, PT_R3(sp) |
| 68 | ldw r4, PT_R4(sp) |
| 69 | ldw r5, PT_R5(sp) |
| 70 | ldw r6, PT_R6(sp) |
| 71 | ldw r7, PT_R7(sp) |
| 72 | ldw r8, PT_R8(sp) |
| 73 | ldw r9, PT_R9(sp) |
| 74 | ldw r10, PT_R10(sp) |
| 75 | ldw r11, PT_R11(sp) |
| 76 | ldw r12, PT_R12(sp) |
| 77 | ldw r13, PT_R13(sp) |
| 78 | ldw r14, PT_R14(sp) |
| 79 | ldw r15, PT_R15(sp) |
| 80 | ldw ra, PT_RA(sp) |
| 81 | ldw fp, PT_FP(sp) |
| 82 | ldw gp, PT_GP(sp) |
| 83 | ldw r24, PT_ESTATUS(sp) |
| 84 | wrctl estatus, r24 |
| 85 | ldw ea, PT_EA(sp) |
| 86 | ldw sp, PT_SP(sp) /* Restore sp last */ |
| 87 | .endm |
| 88 | |
| 89 | .macro SAVE_SWITCH_STACK |
| 90 | addi sp, sp, -SWITCH_STACK_SIZE |
| 91 | stw r16, SW_R16(sp) |
| 92 | stw r17, SW_R17(sp) |
| 93 | stw r18, SW_R18(sp) |
| 94 | stw r19, SW_R19(sp) |
| 95 | stw r20, SW_R20(sp) |
| 96 | stw r21, SW_R21(sp) |
| 97 | stw r22, SW_R22(sp) |
| 98 | stw r23, SW_R23(sp) |
| 99 | stw fp, SW_FP(sp) |
| 100 | stw gp, SW_GP(sp) |
| 101 | stw ra, SW_RA(sp) |
| 102 | .endm |
| 103 | |
| 104 | .macro RESTORE_SWITCH_STACK |
| 105 | ldw r16, SW_R16(sp) |
| 106 | ldw r17, SW_R17(sp) |
| 107 | ldw r18, SW_R18(sp) |
| 108 | ldw r19, SW_R19(sp) |
| 109 | ldw r20, SW_R20(sp) |
| 110 | ldw r21, SW_R21(sp) |
| 111 | ldw r22, SW_R22(sp) |
| 112 | ldw r23, SW_R23(sp) |
| 113 | ldw fp, SW_FP(sp) |
| 114 | ldw gp, SW_GP(sp) |
| 115 | ldw ra, SW_RA(sp) |
| 116 | addi sp, sp, SWITCH_STACK_SIZE |
| 117 | .endm |
| 118 | |
| 119 | #endif /* __ASSEMBLY__ */ |
| 120 | #endif /* _ASM_NIOS2_ENTRY_H */ |