[5532553] | 1 | /* |
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| 2 | * Hitachi H8 Score CPU functions |
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| 3 | * Copyright Comnet Technologies Ltd 1999 |
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| 4 | * |
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| 5 | * Based on example code and other ports with this copyright: |
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| 6 | * |
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| 7 | * COPYRIGHT (c) 1989-1999. |
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| 8 | * On-Line Applications Research Corporation (OAR). |
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| 9 | * |
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| 10 | * The license and distribution terms for this file may be |
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| 11 | * found in the file LICENSE in this distribution or at |
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| 12 | * http://www.OARcorp.com/rtems/license.html. |
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| 13 | * |
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| 14 | * $Id$ |
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| 15 | */ |
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| 16 | |
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| 17 | |
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| 18 | ;.equ RUNCONTEXT_ARG, er0 |
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| 19 | ;.equ HEIRCONTEXT_ARG, er1 |
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| 20 | |
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| 21 | |
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| 22 | /* |
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| 23 | * Make sure we tell the assembler what type of CPU model we are |
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| 24 | * being compiled for. |
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| 25 | */ |
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| 26 | |
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| 27 | #if defined(__H8300H__) |
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| 28 | .h8300h |
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| 29 | #endif |
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| 30 | #if defined(__H8300S__) |
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| 31 | .h8300s |
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| 32 | #endif |
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| 33 | .text |
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| 34 | |
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| 35 | /* |
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| 36 | GCC Compiled with optimisations and Wimplicit decs to ensure |
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| 37 | that stack from doesn't change |
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| 38 | |
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| 39 | Supposedly R2 and R3 do not need to be saved but who knows |
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| 40 | |
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| 41 | Arg1 = er0 (not on stack) |
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| 42 | Arg2 = er1 (not on stack) |
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| 43 | */ |
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| 44 | |
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| 45 | .align 2 |
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| 46 | .global __CPU_Context_switch |
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| 47 | __CPU_Context_switch: |
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| 48 | #if defined(__H8300H__) || defined(__H8300S__) |
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| 49 | /* Save Context */ |
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| 50 | stc ccr,@(0:16,er0) |
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| 51 | mov.l er7,@(2:16,er0) |
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| 52 | mov.l er6,@(6:16,er0) |
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| 53 | mov.l er5,@(10:16,er0) |
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| 54 | mov.l er4,@(14:16,er0) |
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| 55 | mov.l er3,@(18:16,er0) |
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| 56 | mov.l er2,@(22:16,er0) |
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| 57 | |
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| 58 | /* Install New context */ |
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| 59 | |
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| 60 | restore: |
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| 61 | mov.l @(22:16,er1),er2 |
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| 62 | mov.l @(18:16,er1),er3 |
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| 63 | mov.l @(14:16,er1),er4 |
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| 64 | mov.l @(10:16,er1),er5 |
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| 65 | mov.l @(6:16,er1),er6 |
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| 66 | mov.l @(2:16,er1),er7 |
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| 67 | ldc @(0:16,er1),ccr |
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| 68 | #endif |
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| 69 | rts |
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| 70 | |
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| 71 | .align 2 |
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| 72 | .global __CPU_Context_restore |
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| 73 | __CPU_Context_restore: |
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| 74 | #if defined(__H8300H__) || defined(__H8300S__) |
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| 75 | mov.l er0,er1 |
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| 76 | jmp @restore:24 |
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| 77 | #else |
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| 78 | rts |
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| 79 | #endif |
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| 80 | |
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| 81 | |
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| 82 | |
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| 83 | /* |
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| 84 | VHandler for Vectored Interrupts |
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| 85 | |
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| 86 | All IRQ's are vectored to routine _ISR_#vector_number |
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| 87 | This routine stacks er0 and loads er0 with vector number |
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| 88 | before transferring to here |
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| 89 | |
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| 90 | */ |
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| 91 | .align 2 |
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| 92 | .global __ISR_Handler |
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| 93 | .extern __ISR_Nest_level |
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| 94 | .extern __Vector_table |
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| 95 | .extern __Context_switch_necessary |
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| 96 | |
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| 97 | |
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| 98 | __ISR_Handler: |
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| 99 | #if defined(__H8300H__) || defined(__H8300S__) |
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| 100 | mov.l er1,@-er7 |
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| 101 | mov.l er2,@-er7 |
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| 102 | mov.l er3,@-er7 |
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| 103 | mov.l er4,@-er7 |
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| 104 | mov.l er5,@-er7 |
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| 105 | mov.l er6,@-er7 |
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| 106 | |
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| 107 | /* Set IRQ Stack */ |
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| 108 | orc #0x80,ccr |
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| 109 | mov.l er7,er6 ; save stack pointer |
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| 110 | mov.l @__ISR_Nest_level,er1 |
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| 111 | bne nested |
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| 112 | mov.l @__CPU_Interrupt_stack_high,er7 |
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| 113 | |
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| 114 | nested: |
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| 115 | mov.l er6,@-er7 ; save sp so pop regardless of nest level |
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| 116 | |
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| 117 | ;; Inc system counters |
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| 118 | mov.l @__ISR_Nest_level,er1 |
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| 119 | inc.l #1,er1 |
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| 120 | mov.l er1,@__ISR_Nest_level |
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| 121 | mov.l @__Thread_Dispatch_disable_level,er1 |
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| 122 | inc.l #1,er1 |
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| 123 | mov.l er1,@__Thread_Dispatch_disable_level |
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| 124 | |
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| 125 | /* Vector to ISR */ |
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| 126 | |
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| 127 | mov.l #__ISR_Vector_table,er1 |
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| 128 | mov er0,er2 ; copy vector |
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| 129 | shll.l er2 |
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| 130 | shll.l er2 ; vector = vector * 4 (sizeof(int)) |
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| 131 | add.l er2,er1 |
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| 132 | mov.l @er1,er1 |
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| 133 | jsr @er1 ; er0 = arg1 =vector |
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| 134 | |
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| 135 | orc #0x80,ccr |
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| 136 | mov.l @__ISR_Nest_level,er1 |
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| 137 | dec.l #1,er1 |
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| 138 | mov.l er1,@__ISR_Nest_level |
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| 139 | mov.l @__Thread_Dispatch_disable_level,er1 |
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| 140 | dec.l #1,er1 |
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| 141 | mov.l er1,@__Thread_Dispatch_disable_level |
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| 142 | bne exit |
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| 143 | |
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| 144 | mov.l @__Context_Switch_necessary,er1 |
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| 145 | bne bframe ; If yes then dispatch next task |
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| 146 | |
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| 147 | mov.l @__ISR_Signals_to_thread_executing,er1 |
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| 148 | beq exit ; If no signals waiting |
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| 149 | |
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| 150 | /* Context switch here through ISR_Dispatch */ |
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| 151 | |
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| 152 | bframe: |
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| 153 | orc #0x80,ccr |
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| 154 | /* Pop Stack */ |
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| 155 | mov @er7+,er6 |
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| 156 | mov er6,er7 |
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| 157 | mov.l #0,er2 |
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| 158 | mov.l er2,@__ISR_Signals_to_thread_executing |
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| 159 | |
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| 160 | /* Set up IRQ stack frame and dispatch to _ISR_Dispatch */ |
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| 161 | |
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| 162 | stc ccr,@er2 |
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| 163 | and.l #0xff,er2 |
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| 164 | rotr.l er2 |
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| 165 | rotr.l er2 |
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| 166 | rotr.l er2 |
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| 167 | rotr.l er2 |
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| 168 | or.l #_ISR_Dispatch,er2 |
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| 169 | mov.l er2,@-er7 |
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| 170 | rte |
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| 171 | |
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| 172 | /* Inner IRQ Return, pop flags and return */ |
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| 173 | exit: |
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| 174 | /* Pop Stack */ |
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| 175 | orc #0x80,ccr |
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| 176 | mov @er7+,er6 |
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| 177 | mov er6,er7 |
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| 178 | andc #0x7f,ccr |
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| 179 | mov @er7+,er6 |
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| 180 | mov @er7+,er5 |
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| 181 | mov @er7+,er4 |
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| 182 | mov @er7+,er3 |
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| 183 | mov @er7+,er2 |
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| 184 | mov @er7+,er1 |
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| 185 | mov @er7+,er0 |
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| 186 | andc #0x7f,ccr |
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| 187 | rte |
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| 188 | #endif |
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| 189 | |
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| 190 | /* |
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| 191 | Called from ISR_Handler as a way of ending IRQ |
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| 192 | but allowing dispatch to another task. |
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| 193 | Must use RTE as CCR is still on stack but IRQ has been serviced. |
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| 194 | CCR and PC occupy same word so rte can be used. |
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| 195 | */ |
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| 196 | |
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| 197 | .align 2 |
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| 198 | .global _ISR_Dispatch |
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| 199 | |
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| 200 | _ISR_Dispatch: |
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| 201 | #if defined(__H8300H__) || defined(__H8300S__) |
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| 202 | jsr @__Thread_Dispatch |
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| 203 | mov @er7+,er6 |
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| 204 | mov @er7+,er5 |
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| 205 | mov @er7+,er4 |
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| 206 | mov @er7+,er3 |
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| 207 | mov @er7+,er2 |
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| 208 | mov @er7+,er1 |
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| 209 | mov @er7+,er0 |
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| 210 | rte |
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| 211 | #endif |
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| 212 | |
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| 213 | |
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| 214 | .align 2 |
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| 215 | .global __CPU_Context_save_fp |
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| 216 | |
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| 217 | __CPU_Context_save_fp: |
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| 218 | rts |
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| 219 | |
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| 220 | |
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| 221 | .align 2 |
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| 222 | .global __CPU_Context_restore_fp |
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| 223 | |
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| 224 | __CPU_Context_restore_fp: |
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| 225 | rts |
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| 226 | |
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