Martin Woolley / microbit-dal-x

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Dependencies:   BLE_API mbed-dev-bin nRF51822

Fork of microbit-dal by Lancaster University

source/asm/CortexContextSwitch.s.armcc@12:755087a1ef83, 2016-04-08 (annotated)

Committer:
Jonathan Austin
Date:
Fri Apr 08 15:17:22 2016 +0100
Revision:
12:755087a1ef83
Parent:
source/asm/CortexContextSwitch.s@11:e42f70d19daf 
Revert previous changes in order to sync them from git

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Jonathan Austin 1:8aa5cdb4ab67 1 ; The MIT License (MIT)
Jonathan Austin 1:8aa5cdb4ab67 2
Jonathan Austin 1:8aa5cdb4ab67 3 ; Copyright (c) 2016 British Broadcasting Corporation.
Jonathan Austin 1:8aa5cdb4ab67 4 ; This software is provided by Lancaster University by arrangement with the BBC.
Jonathan Austin 1:8aa5cdb4ab67 5
Jonathan Austin 1:8aa5cdb4ab67 6 ; Permission is hereby granted, free of charge, to any person obtaining a
Jonathan Austin 1:8aa5cdb4ab67 7 ; copy of this software and associated documentation files (the "Software"),
Jonathan Austin 1:8aa5cdb4ab67 8 ; to deal in the Software without restriction, including without limitation
Jonathan Austin 1:8aa5cdb4ab67 9 ; the rights to use, copy, modify, merge, publish, distribute, sublicense,
Jonathan Austin 1:8aa5cdb4ab67 10 ; and/or sell copies of the Software, and to permit persons to whom the
Jonathan Austin 1:8aa5cdb4ab67 11 ; Software is furnished to do so, subject to the following conditions:
Jonathan Austin 1:8aa5cdb4ab67 12
Jonathan Austin 1:8aa5cdb4ab67 13 ; The above copyright notice and this permission notice shall be included in
Jonathan Austin 1:8aa5cdb4ab67 14 ; all copies or substantial portions of the Software.
Jonathan Austin 1:8aa5cdb4ab67 15
Jonathan Austin 1:8aa5cdb4ab67 16 ; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
Jonathan Austin 1:8aa5cdb4ab67 17 ; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
Jonathan Austin 1:8aa5cdb4ab67 18 ; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
Jonathan Austin 1:8aa5cdb4ab67 19 ; THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
Jonathan Austin 1:8aa5cdb4ab67 20 ; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
Jonathan Austin 1:8aa5cdb4ab67 21 ; FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
Jonathan Austin 1:8aa5cdb4ab67 22 ; DEALINGS IN THE SOFTWARE.
Jonathan Austin 1:8aa5cdb4ab67 23
Jonathan Austin 1:8aa5cdb4ab67 24 AREA asm_func, CODE, READONLY
Jonathan Austin 1:8aa5cdb4ab67 25
Jonathan Austin 1:8aa5cdb4ab67 26 ; Export our context switching subroutine as a C function for use in mbed
Jonathan Austin 1:8aa5cdb4ab67 27 EXPORT swap_context
Jonathan Austin 1:8aa5cdb4ab67 28 EXPORT save_context
Jonathan Austin 1:8aa5cdb4ab67 29 EXPORT save_register_context
Jonathan Austin 1:8aa5cdb4ab67 30 EXPORT restore_register_context
Jonathan Austin 1:8aa5cdb4ab67 31
Jonathan Austin 1:8aa5cdb4ab67 32 ALIGN
Jonathan Austin 1:8aa5cdb4ab67 33
Jonathan Austin 1:8aa5cdb4ab67 34 ; R0 Contains a pointer to the TCB of the fibre being scheduled out.
Jonathan Austin 1:8aa5cdb4ab67 35 ; R1 Contains a pointer to the TCB of the fibre being scheduled in.
Jonathan Austin 1:8aa5cdb4ab67 36 ; R2 Contains a pointer to the base of the stack of the fibre being scheduled out.
Jonathan Austin 1:8aa5cdb4ab67 37 ; R3 Contains a pointer to the base of the stack of the fibre being scheduled in.
Jonathan Austin 1:8aa5cdb4ab67 38
Jonathan Austin 1:8aa5cdb4ab67 39 swap_context
Jonathan Austin 1:8aa5cdb4ab67 40
Jonathan Austin 1:8aa5cdb4ab67 41 ; Write our core registers into the TCB
Jonathan Austin 1:8aa5cdb4ab67 42 ; First, store the general registers
Jonathan Austin 1:8aa5cdb4ab67 43
Jonathan Austin 1:8aa5cdb4ab67 44 ; Skip this is we're given a NULL parameter for the TCB
Jonathan Austin 1:8aa5cdb4ab67 45 CMP R0, #0
Jonathan Austin 1:8aa5cdb4ab67 46 BEQ store_context_complete
Jonathan Austin 1:8aa5cdb4ab67 47
Jonathan Austin 1:8aa5cdb4ab67 48 STR R0, [R0,#0]
Jonathan Austin 1:8aa5cdb4ab67 49 STR R1, [R0,#4]
Jonathan Austin 1:8aa5cdb4ab67 50 STR R2, [R0,#8]
Jonathan Austin 1:8aa5cdb4ab67 51 STR R3, [R0,#12]
Jonathan Austin 1:8aa5cdb4ab67 52 STR R4, [R0,#16]
Jonathan Austin 1:8aa5cdb4ab67 53 STR R5, [R0,#20]
Jonathan Austin 1:8aa5cdb4ab67 54 STR R6, [R0,#24]
Jonathan Austin 1:8aa5cdb4ab67 55 STR R7, [R0,#28]
Jonathan Austin 1:8aa5cdb4ab67 56
Jonathan Austin 1:8aa5cdb4ab67 57 ; Now the high general purpose registers
Jonathan Austin 1:8aa5cdb4ab67 58 MOV R4, R8
Jonathan Austin 1:8aa5cdb4ab67 59 STR R4, [R0,#32]
Jonathan Austin 1:8aa5cdb4ab67 60 MOV R4, R9
Jonathan Austin 1:8aa5cdb4ab67 61 STR R4, [R0,#36]
Jonathan Austin 1:8aa5cdb4ab67 62 MOV R4, R10
Jonathan Austin 1:8aa5cdb4ab67 63 STR R4, [R0,#40]
Jonathan Austin 1:8aa5cdb4ab67 64 MOV R4, R11
Jonathan Austin 1:8aa5cdb4ab67 65 STR R4, [R0,#44]
Jonathan Austin 1:8aa5cdb4ab67 66 MOV R4, R12
Jonathan Austin 1:8aa5cdb4ab67 67 STR R4, [R0,#48]
Jonathan Austin 1:8aa5cdb4ab67 68
Jonathan Austin 1:8aa5cdb4ab67 69 ; Now the Stack and Link Register.
Jonathan Austin 1:8aa5cdb4ab67 70 ; As this context is only intended for use with a fiber scheduler,
Jonathan Austin 1:8aa5cdb4ab67 71 ; we don't need the PC.
Jonathan Austin 1:8aa5cdb4ab67 72 MOV R6, SP
Jonathan Austin 1:8aa5cdb4ab67 73 STR R6, [R0,#52]
Jonathan Austin 1:8aa5cdb4ab67 74 MOV R4, LR
Jonathan Austin 1:8aa5cdb4ab67 75 STR R4, [R0,#56]
Jonathan Austin 1:8aa5cdb4ab67 76
Jonathan Austin 1:8aa5cdb4ab67 77 store_context_complete
Jonathan Austin 1:8aa5cdb4ab67 78 ; Finally, Copy the stack. We do this to reduce RAM footprint, as stack is usually very small at the point
Jonathan Austin 1:8aa5cdb4ab67 79 ; of scheduling, but we need a lot of capacity for interrupt handling and other functions.
Jonathan Austin 1:8aa5cdb4ab67 80
Jonathan Austin 1:8aa5cdb4ab67 81 ; Skip this is we're given a NULL parameter for the stack.
Jonathan Austin 1:8aa5cdb4ab67 82 CMP R2, #0
Jonathan Austin 1:8aa5cdb4ab67 83 BEQ store_stack_complete
Jonathan Austin 1:8aa5cdb4ab67 84
Jonathan Austin 1:8aa5cdb4ab67 85 LDR R4, [R0,#60] ; Load R4 with the fiber's defined stack_base.
Jonathan Austin 1:8aa5cdb4ab67 86 store_stack
Jonathan Austin 1:8aa5cdb4ab67 87 SUBS R4, #4
Jonathan Austin 1:8aa5cdb4ab67 88 SUBS R2, #4
Jonathan Austin 1:8aa5cdb4ab67 89
Jonathan Austin 1:8aa5cdb4ab67 90 LDR R5, [R4]
Jonathan Austin 1:8aa5cdb4ab67 91 STR R5, [R2]
Jonathan Austin 1:8aa5cdb4ab67 92
Jonathan Austin 1:8aa5cdb4ab67 93 CMP R4, R6
Jonathan Austin 1:8aa5cdb4ab67 94 BNE store_stack
Jonathan Austin 1:8aa5cdb4ab67 95
Jonathan Austin 1:8aa5cdb4ab67 96 store_stack_complete
Jonathan Austin 1:8aa5cdb4ab67 97
Jonathan Austin 1:8aa5cdb4ab67 98 ;
Jonathan Austin 1:8aa5cdb4ab67 99 ; Now page in the new context.
Jonathan Austin 1:8aa5cdb4ab67 100 ; Update all registers except the PC. We can also safely ignore the STATUS register, as we're just a fiber scheduler.
Jonathan Austin 1:8aa5cdb4ab67 101 ;
Jonathan Austin 1:8aa5cdb4ab67 102 LDR R4, [R1, #56]
Jonathan Austin 1:8aa5cdb4ab67 103 MOV LR, R4
Jonathan Austin 1:8aa5cdb4ab67 104 LDR R6, [R1, #52]
Jonathan Austin 1:8aa5cdb4ab67 105 MOV SP, R6
Jonathan Austin 1:8aa5cdb4ab67 106
Jonathan Austin 1:8aa5cdb4ab67 107 ; Copy the stack in.
Jonathan Austin 1:8aa5cdb4ab67 108 ; n.b. we do this after setting the SP to make comparisons easier.
Jonathan Austin 1:8aa5cdb4ab67 109
Jonathan Austin 1:8aa5cdb4ab67 110 ; Skip this is we're given a NULL parameter for the stack.
Jonathan Austin 1:8aa5cdb4ab67 111 CMP R3, #0
Jonathan Austin 1:8aa5cdb4ab67 112 BEQ restore_stack_complete
Jonathan Austin 1:8aa5cdb4ab67 113
Jonathan Austin 1:8aa5cdb4ab67 114 LDR R4, [R1,#60] ; Load R4 with the fiber's defined stack_base.
Jonathan Austin 1:8aa5cdb4ab67 115
Jonathan Austin 1:8aa5cdb4ab67 116 restore_stack
Jonathan Austin 1:8aa5cdb4ab67 117 SUBS R4, #4
Jonathan Austin 1:8aa5cdb4ab67 118 SUBS R3, #4
Jonathan Austin 1:8aa5cdb4ab67 119
Jonathan Austin 1:8aa5cdb4ab67 120 LDR R5, [R3]
Jonathan Austin 1:8aa5cdb4ab67 121 STR R5, [R4]
Jonathan Austin 1:8aa5cdb4ab67 122
Jonathan Austin 1:8aa5cdb4ab67 123 CMP R4, R6
Jonathan Austin 1:8aa5cdb4ab67 124 BNE restore_stack
Jonathan Austin 1:8aa5cdb4ab67 125
Jonathan Austin 1:8aa5cdb4ab67 126 restore_stack_complete
Jonathan Austin 1:8aa5cdb4ab67 127 LDR R4, [R1, #48]
Jonathan Austin 1:8aa5cdb4ab67 128 MOV R12, R4
Jonathan Austin 1:8aa5cdb4ab67 129 LDR R4, [R1, #44]
Jonathan Austin 1:8aa5cdb4ab67 130 MOV R11, R4
Jonathan Austin 1:8aa5cdb4ab67 131 LDR R4, [R1, #40]
Jonathan Austin 1:8aa5cdb4ab67 132 MOV R10, R4
Jonathan Austin 1:8aa5cdb4ab67 133 LDR R4, [R1, #36]
Jonathan Austin 1:8aa5cdb4ab67 134 MOV R9, R4
Jonathan Austin 1:8aa5cdb4ab67 135 LDR R4, [R1, #32]
Jonathan Austin 1:8aa5cdb4ab67 136 MOV R8, R4
Jonathan Austin 1:8aa5cdb4ab67 137
Jonathan Austin 1:8aa5cdb4ab67 138 LDR R7, [R1, #28]
Jonathan Austin 1:8aa5cdb4ab67 139 LDR R6, [R1, #24]
Jonathan Austin 1:8aa5cdb4ab67 140 LDR R5, [R1, #20]
Jonathan Austin 1:8aa5cdb4ab67 141 LDR R4, [R1, #16]
Jonathan Austin 1:8aa5cdb4ab67 142 LDR R3, [R1, #12]
Jonathan Austin 1:8aa5cdb4ab67 143 LDR R2, [R1, #8]
Jonathan Austin 1:8aa5cdb4ab67 144 LDR R0, [R1, #0]
Jonathan Austin 1:8aa5cdb4ab67 145 LDR R1, [R1, #4]
Jonathan Austin 1:8aa5cdb4ab67 146
Jonathan Austin 1:8aa5cdb4ab67 147 ; Return to caller (scheduler).
Jonathan Austin 1:8aa5cdb4ab67 148 BX LR
Jonathan Austin 1:8aa5cdb4ab67 149
Jonathan Austin 1:8aa5cdb4ab67 150
Jonathan Austin 1:8aa5cdb4ab67 151 ; R0 Contains a pointer to the TCB of the fibre to snapshot
Jonathan Austin 1:8aa5cdb4ab67 152 ; R1 Contains a pointer to the base of the stack of the fibre being snapshotted
Jonathan Austin 1:8aa5cdb4ab67 153
Jonathan Austin 1:8aa5cdb4ab67 154 save_context
Jonathan Austin 1:8aa5cdb4ab67 155
Jonathan Austin 1:8aa5cdb4ab67 156 ; Write our core registers into the TCB
Jonathan Austin 1:8aa5cdb4ab67 157 ; First, store the general registers
Jonathan Austin 1:8aa5cdb4ab67 158
Jonathan Austin 1:8aa5cdb4ab67 159 STR R0, [R0,#0]
Jonathan Austin 1:8aa5cdb4ab67 160 STR R1, [R0,#4]
Jonathan Austin 1:8aa5cdb4ab67 161 STR R2, [R0,#8]
Jonathan Austin 1:8aa5cdb4ab67 162 STR R3, [R0,#12]
Jonathan Austin 1:8aa5cdb4ab67 163 STR R4, [R0,#16]
Jonathan Austin 1:8aa5cdb4ab67 164 STR R5, [R0,#20]
Jonathan Austin 1:8aa5cdb4ab67 165 STR R6, [R0,#24]
Jonathan Austin 1:8aa5cdb4ab67 166 STR R7, [R0,#28]
Jonathan Austin 1:8aa5cdb4ab67 167
Jonathan Austin 1:8aa5cdb4ab67 168 ; Now the high general purpose registers
Jonathan Austin 1:8aa5cdb4ab67 169 MOV R4, R8
Jonathan Austin 1:8aa5cdb4ab67 170 STR R4, [R0,#32]
Jonathan Austin 1:8aa5cdb4ab67 171 MOV R4, R9
Jonathan Austin 1:8aa5cdb4ab67 172 STR R4, [R0,#36]
Jonathan Austin 1:8aa5cdb4ab67 173 MOV R4, R10
Jonathan Austin 1:8aa5cdb4ab67 174 STR R4, [R0,#40]
Jonathan Austin 1:8aa5cdb4ab67 175 MOV R4, R11
Jonathan Austin 1:8aa5cdb4ab67 176 STR R4, [R0,#44]
Jonathan Austin 1:8aa5cdb4ab67 177 MOV R4, R12
Jonathan Austin 1:8aa5cdb4ab67 178 STR R4, [R0,#48]
Jonathan Austin 1:8aa5cdb4ab67 179
Jonathan Austin 1:8aa5cdb4ab67 180 ; Now the Stack and Link Register.
Jonathan Austin 1:8aa5cdb4ab67 181 ; As this context is only intended for use with a fiber scheduler,
Jonathan Austin 1:8aa5cdb4ab67 182 ; we don't need the PC.
Jonathan Austin 1:8aa5cdb4ab67 183 MOV R6, SP
Jonathan Austin 1:8aa5cdb4ab67 184 STR R6, [R0,#52]
Jonathan Austin 1:8aa5cdb4ab67 185 MOV R4, LR
Jonathan Austin 1:8aa5cdb4ab67 186 STR R4, [R0,#56]
Jonathan Austin 1:8aa5cdb4ab67 187
Jonathan Austin 1:8aa5cdb4ab67 188 ; Finally, Copy the stack. We do this to reduce RAM footprint, as stackis usually very small at the point
Jonathan Austin 1:8aa5cdb4ab67 189 ; of sceduling, but we need a lot of capacity for interrupt handling and other functions.
Jonathan Austin 1:8aa5cdb4ab67 190
Jonathan Austin 1:8aa5cdb4ab67 191 LDR R4, [R0,#60] ; Load R4 with the fiber's defined stack_base.
Jonathan Austin 1:8aa5cdb4ab67 192
Jonathan Austin 1:8aa5cdb4ab67 193 store_stack1
Jonathan Austin 1:8aa5cdb4ab67 194 SUBS R4, #4
Jonathan Austin 1:8aa5cdb4ab67 195 SUBS R1, #4
Jonathan Austin 1:8aa5cdb4ab67 196
Jonathan Austin 1:8aa5cdb4ab67 197 LDR R5, [R4]
Jonathan Austin 1:8aa5cdb4ab67 198 STR R5, [R1]
Jonathan Austin 1:8aa5cdb4ab67 199
Jonathan Austin 1:8aa5cdb4ab67 200 CMP R4, R6
Jonathan Austin 1:8aa5cdb4ab67 201 BNE store_stack1
Jonathan Austin 1:8aa5cdb4ab67 202
Jonathan Austin 1:8aa5cdb4ab67 203 ; Restore scratch registers.
Jonathan Austin 1:8aa5cdb4ab67 204
Jonathan Austin 1:8aa5cdb4ab67 205 LDR R7, [R0, #28]
Jonathan Austin 1:8aa5cdb4ab67 206 LDR R6, [R0, #24]
Jonathan Austin 1:8aa5cdb4ab67 207 LDR R5, [R0, #20]
Jonathan Austin 1:8aa5cdb4ab67 208 LDR R4, [R0, #16]
Jonathan Austin 1:8aa5cdb4ab67 209
Jonathan Austin 1:8aa5cdb4ab67 210 ; Return to caller (scheduler).
Jonathan Austin 1:8aa5cdb4ab67 211 BX LR
Jonathan Austin 1:8aa5cdb4ab67 212
Jonathan Austin 1:8aa5cdb4ab67 213
Jonathan Austin 1:8aa5cdb4ab67 214 ; R0 Contains a pointer to the TCB of the fiber to snapshot
Jonathan Austin 1:8aa5cdb4ab67 215 save_register_context
Jonathan Austin 1:8aa5cdb4ab67 216
Jonathan Austin 1:8aa5cdb4ab67 217 ; Write our core registers into the TCB
Jonathan Austin 1:8aa5cdb4ab67 218 ; First, store the general registers
Jonathan Austin 1:8aa5cdb4ab67 219
Jonathan Austin 1:8aa5cdb4ab67 220 STR R0, [R0,#0]
Jonathan Austin 1:8aa5cdb4ab67 221 STR R1, [R0,#4]
Jonathan Austin 1:8aa5cdb4ab67 222 STR R2, [R0,#8]
Jonathan Austin 1:8aa5cdb4ab67 223 STR R3, [R0,#12]
Jonathan Austin 1:8aa5cdb4ab67 224 STR R4, [R0,#16]
Jonathan Austin 1:8aa5cdb4ab67 225 STR R5, [R0,#20]
Jonathan Austin 1:8aa5cdb4ab67 226 STR R6, [R0,#24]
Jonathan Austin 1:8aa5cdb4ab67 227 STR R7, [R0,#28]
Jonathan Austin 1:8aa5cdb4ab67 228
Jonathan Austin 1:8aa5cdb4ab67 229 ; Now the high general purpose registers
Jonathan Austin 1:8aa5cdb4ab67 230 MOV R4, R8
Jonathan Austin 1:8aa5cdb4ab67 231 STR R4, [R0,#32]
Jonathan Austin 1:8aa5cdb4ab67 232 MOV R4, R9
Jonathan Austin 1:8aa5cdb4ab67 233 STR R4, [R0,#36]
Jonathan Austin 1:8aa5cdb4ab67 234 MOV R4, R10
Jonathan Austin 1:8aa5cdb4ab67 235 STR R4, [R0,#40]
Jonathan Austin 1:8aa5cdb4ab67 236 MOV R4, R11
Jonathan Austin 1:8aa5cdb4ab67 237 STR R4, [R0,#44]
Jonathan Austin 1:8aa5cdb4ab67 238 MOV R4, R12
Jonathan Austin 1:8aa5cdb4ab67 239 STR R4, [R0,#48]
Jonathan Austin 1:8aa5cdb4ab67 240
Jonathan Austin 1:8aa5cdb4ab67 241 ; Now the Stack Pointer and Link Register.
Jonathan Austin 1:8aa5cdb4ab67 242 ; As this context is only intended for use with a fiber scheduler,
Jonathan Austin 1:8aa5cdb4ab67 243 ; we don't need the PC.
Jonathan Austin 1:8aa5cdb4ab67 244 MOV R4, SP
Jonathan Austin 1:8aa5cdb4ab67 245 STR R4, [R0,#52]
Jonathan Austin 1:8aa5cdb4ab67 246 MOV R4, LR
Jonathan Austin 1:8aa5cdb4ab67 247 STR R4, [R0,#56]
Jonathan Austin 1:8aa5cdb4ab67 248
Jonathan Austin 1:8aa5cdb4ab67 249 ; Restore scratch registers.
Jonathan Austin 1:8aa5cdb4ab67 250 LDR R4, [R0, #16]
Jonathan Austin 1:8aa5cdb4ab67 251
Jonathan Austin 1:8aa5cdb4ab67 252 ; Return to caller (scheduler).
Jonathan Austin 1:8aa5cdb4ab67 253 BX LR
Jonathan Austin 1:8aa5cdb4ab67 254
Jonathan Austin 1:8aa5cdb4ab67 255
Jonathan Austin 1:8aa5cdb4ab67 256 restore_register_context
Jonathan Austin 1:8aa5cdb4ab67 257
Jonathan Austin 1:8aa5cdb4ab67 258 ;
Jonathan Austin 1:8aa5cdb4ab67 259 ; Now page in the new context.
Jonathan Austin 1:8aa5cdb4ab67 260 ; Update all registers except the PC. We can also safely ignore the STATUS register, as we're just a fiber scheduler.
Jonathan Austin 1:8aa5cdb4ab67 261 ;
Jonathan Austin 1:8aa5cdb4ab67 262 LDR R4, [R0, #56]
Jonathan Austin 1:8aa5cdb4ab67 263 MOV LR, R4
Jonathan Austin 1:8aa5cdb4ab67 264 LDR R4, [R0, #52]
Jonathan Austin 1:8aa5cdb4ab67 265 MOV SP, R4
Jonathan Austin 1:8aa5cdb4ab67 266
Jonathan Austin 1:8aa5cdb4ab67 267 ; High registers...
Jonathan Austin 1:8aa5cdb4ab67 268 LDR R4, [R0, #48]
Jonathan Austin 1:8aa5cdb4ab67 269 MOV R12, R4
Jonathan Austin 1:8aa5cdb4ab67 270 LDR R4, [R0, #44]
Jonathan Austin 1:8aa5cdb4ab67 271 MOV R11, R4
Jonathan Austin 1:8aa5cdb4ab67 272 LDR R4, [R0, #40]
Jonathan Austin 1:8aa5cdb4ab67 273 MOV R10, R4
Jonathan Austin 1:8aa5cdb4ab67 274 LDR R4, [R0, #36]
Jonathan Austin 1:8aa5cdb4ab67 275 MOV R9, R4
Jonathan Austin 1:8aa5cdb4ab67 276 LDR R4, [R0, #32]
Jonathan Austin 1:8aa5cdb4ab67 277 MOV R8, R4
Jonathan Austin 1:8aa5cdb4ab67 278
Jonathan Austin 1:8aa5cdb4ab67 279 ; Low registers...
Jonathan Austin 1:8aa5cdb4ab67 280 LDR R7, [R0, #28]
Jonathan Austin 1:8aa5cdb4ab67 281 LDR R6, [R0, #24]
Jonathan Austin 1:8aa5cdb4ab67 282 LDR R5, [R0, #20]
Jonathan Austin 1:8aa5cdb4ab67 283 LDR R4, [R0, #16]
Jonathan Austin 1:8aa5cdb4ab67 284 LDR R3, [R0, #12]
Jonathan Austin 1:8aa5cdb4ab67 285 LDR R2, [R0, #8]
Jonathan Austin 1:8aa5cdb4ab67 286 LDR R0, [R0, #0]
Jonathan Austin 1:8aa5cdb4ab67 287 LDR R1, [R0, #4]
Jonathan Austin 1:8aa5cdb4ab67 288
Jonathan Austin 1:8aa5cdb4ab67 289 ; Return to caller (normally the scheduler).
Jonathan Austin 1:8aa5cdb4ab67 290 BX LR
Jonathan Austin 1:8aa5cdb4ab67 291
Jonathan Austin 1:8aa5cdb4ab67 292 ALIGN
Jonathan Austin 1:8aa5cdb4ab67 293 END