| /* Copyright (c) 2011 The Chromium OS Authors. All rights reserved. |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| * |
| * Cortex-M CPU initialization |
| */ |
| |
| #include "config.h" |
| |
| .section .text.vecttable |
| |
| .macro vector name |
| .long \name\()_handler |
| .weak \name\()_handler |
| .set \name\()_handler, default_handler |
| .endm |
| |
| .macro vector_irq number |
| .if \number < CONFIG_IRQ_COUNT |
| vector irq_\()\number |
| .endif |
| .endm |
| |
| /* Exceptions vector */ |
| vectors: |
| .long stack_end @ initial stack pointer |
| .long reset @ reset handler |
| vector nmi @ NMI handler |
| vector hard_fault @ HardFault handler |
| vector mpu_fault @ MPU fault handler |
| vector bus_fault @ Bus fault handler |
| vector usage_fault @ Usage fault handler |
| .long 0 @ reserved |
| .long 0 @ reserved |
| .long 0 @ reserved |
| .long 0 @ reserved |
| .long svc_helper_handler @ SWI |
| vector debug @ Debug handler |
| .long 0 @ reserved |
| vector pendsv @ PendSV handler |
| vector sys_tick @ SysTick handler |
| vector_irq 0 @ IRQ 0 handler |
| vector_irq 1 @ IRQ 1 handler |
| vector_irq 2 @ IRQ 2 handler |
| vector_irq 3 @ IRQ 3 handler |
| vector_irq 4 @ IRQ 4 handler |
| vector_irq 5 @ IRQ 5 handler |
| vector_irq 6 @ IRQ 6 handler |
| vector_irq 7 @ IRQ 7 handler |
| vector_irq 8 @ IRQ 8 handler |
| vector_irq 9 @ IRQ 9 handler |
| vector_irq 10 @ IRQ 10 handler |
| vector_irq 11 @ IRQ 11 handler |
| vector_irq 12 @ IRQ 12 handler |
| vector_irq 13 @ IRQ 13 handler |
| vector_irq 14 @ IRQ 14 handler |
| vector_irq 15 @ IRQ 15 handler |
| vector_irq 16 @ IRQ 16 handler |
| vector_irq 17 @ IRQ 17 handler |
| vector_irq 18 @ IRQ 18 handler |
| vector_irq 19 @ IRQ 19 handler |
| vector_irq 20 @ IRQ 20 handler |
| vector_irq 21 @ IRQ 21 handler |
| vector_irq 22 @ IRQ 22 handler |
| vector_irq 23 @ IRQ 23 handler |
| vector_irq 24 @ IRQ 24 handler |
| vector_irq 25 @ IRQ 25 handler |
| vector_irq 26 @ IRQ 26 handler |
| vector_irq 27 @ IRQ 27 handler |
| vector_irq 28 @ IRQ 28 handler |
| vector_irq 29 @ IRQ 29 handler |
| vector_irq 30 @ IRQ 30 handler |
| vector_irq 31 @ IRQ 31 handler |
| vector_irq 32 @ IRQ 32 handler |
| vector_irq 33 @ IRQ 33 handler |
| vector_irq 34 @ IRQ 34 handler |
| vector_irq 35 @ IRQ 35 handler |
| vector_irq 36 @ IRQ 36 handler |
| vector_irq 37 @ IRQ 37 handler |
| vector_irq 38 @ IRQ 38 handler |
| vector_irq 39 @ IRQ 39 handler |
| vector_irq 40 @ IRQ 40 handler |
| vector_irq 41 @ IRQ 41 handler |
| vector_irq 42 @ IRQ 42 handler |
| vector_irq 43 @ IRQ 43 handler |
| vector_irq 44 @ IRQ 44 handler |
| vector_irq 45 @ IRQ 45 handler |
| vector_irq 46 @ IRQ 46 handler |
| vector_irq 47 @ IRQ 47 handler |
| vector_irq 48 @ IRQ 48 handler |
| vector_irq 49 @ IRQ 49 handler |
| vector_irq 50 @ IRQ 50 handler |
| vector_irq 51 @ IRQ 51 handler |
| vector_irq 52 @ IRQ 52 handler |
| vector_irq 53 @ IRQ 53 handler |
| vector_irq 54 @ IRQ 54 handler |
| vector_irq 55 @ IRQ 55 handler |
| vector_irq 56 @ IRQ 56 handler |
| vector_irq 57 @ IRQ 57 handler |
| vector_irq 58 @ IRQ 58 handler |
| vector_irq 59 @ IRQ 59 handler |
| vector_irq 60 @ IRQ 60 handler |
| vector_irq 61 @ IRQ 61 handler |
| vector_irq 62 @ IRQ 62 handler |
| vector_irq 63 @ IRQ 63 handler |
| vector_irq 64 @ IRQ 64 handler |
| vector_irq 65 @ IRQ 65 handler |
| vector_irq 66 @ IRQ 66 handler |
| vector_irq 67 @ IRQ 67 handler |
| vector_irq 68 @ IRQ 68 handler |
| vector_irq 69 @ IRQ 69 handler |
| vector_irq 70 @ IRQ 70 handler |
| vector_irq 71 @ IRQ 71 handler |
| vector_irq 72 @ IRQ 72 handler |
| vector_irq 73 @ IRQ 73 handler |
| vector_irq 74 @ IRQ 74 handler |
| vector_irq 75 @ IRQ 75 handler |
| vector_irq 76 @ IRQ 76 handler |
| vector_irq 77 @ IRQ 77 handler |
| vector_irq 78 @ IRQ 78 handler |
| vector_irq 79 @ IRQ 79 handler |
| vector_irq 80 @ IRQ 80 handler |
| vector_irq 81 @ IRQ 81 handler |
| vector_irq 82 @ IRQ 82 handler |
| vector_irq 83 @ IRQ 83 handler |
| vector_irq 84 @ IRQ 84 handler |
| vector_irq 85 @ IRQ 85 handler |
| vector_irq 86 @ IRQ 86 handler |
| vector_irq 87 @ IRQ 87 handler |
| vector_irq 88 @ IRQ 88 handler |
| vector_irq 89 @ IRQ 89 handler |
| vector_irq 90 @ IRQ 90 handler |
| vector_irq 91 @ IRQ 91 handler |
| vector_irq 92 @ IRQ 92 handler |
| vector_irq 93 @ IRQ 93 handler |
| vector_irq 94 @ IRQ 94 handler |
| vector_irq 95 @ IRQ 95 handler |
| vector_irq 96 @ IRQ 96 handler |
| vector_irq 97 @ IRQ 97 handler |
| vector_irq 98 @ IRQ 98 handler |
| vector_irq 99 @ IRQ 99 handler |
| vector_irq 100 @ IRQ 100 handler |
| vector_irq 101 @ IRQ 101 handler |
| vector_irq 102 @ IRQ 102 handler |
| vector_irq 103 @ IRQ 103 handler |
| vector_irq 104 @ IRQ 104 handler |
| vector_irq 105 @ IRQ 105 handler |
| vector_irq 106 @ IRQ 106 handler |
| vector_irq 107 @ IRQ 107 handler |
| vector_irq 108 @ IRQ 108 handler |
| vector_irq 109 @ IRQ 109 handler |
| vector_irq 110 @ IRQ 110 handler |
| vector_irq 111 @ IRQ 111 handler |
| vector_irq 112 @ IRQ 112 handler |
| vector_irq 113 @ IRQ 113 handler |
| vector_irq 114 @ IRQ 114 handler |
| vector_irq 115 @ IRQ 115 handler |
| vector_irq 116 @ IRQ 116 handler |
| vector_irq 117 @ IRQ 117 handler |
| vector_irq 118 @ IRQ 118 handler |
| vector_irq 119 @ IRQ 119 handler |
| vector_irq 120 @ IRQ 120 handler |
| vector_irq 121 @ IRQ 121 handler |
| vector_irq 122 @ IRQ 122 handler |
| vector_irq 123 @ IRQ 123 handler |
| vector_irq 124 @ IRQ 124 handler |
| vector_irq 125 @ IRQ 125 handler |
| vector_irq 126 @ IRQ 126 handler |
| vector_irq 127 @ IRQ 127 handler |
| vector_irq 128 @ IRQ 128 handler |
| vector_irq 129 @ IRQ 129 handler |
| vector_irq 130 @ IRQ 130 handler |
| vector_irq 131 @ IRQ 131 handler |
| vector_irq 132 @ IRQ 132 handler |
| vector_irq 133 @ IRQ 133 handler |
| vector_irq 134 @ IRQ 134 handler |
| vector_irq 135 @ IRQ 135 handler |
| vector_irq 136 @ IRQ 136 handler |
| vector_irq 137 @ IRQ 137 handler |
| vector_irq 138 @ IRQ 138 handler |
| vector_irq 139 @ IRQ 139 handler |
| vector_irq 140 @ IRQ 140 handler |
| vector_irq 141 @ IRQ 141 handler |
| vector_irq 142 @ IRQ 142 handler |
| vector_irq 143 @ IRQ 143 handler |
| vector_irq 144 @ IRQ 144 handler |
| vector_irq 145 @ IRQ 145 handler |
| vector_irq 146 @ IRQ 146 handler |
| vector_irq 147 @ IRQ 147 handler |
| vector_irq 148 @ IRQ 148 handler |
| vector_irq 149 @ IRQ 149 handler |
| vector_irq 150 @ IRQ 150 handler |
| vector_irq 151 @ IRQ 151 handler |
| vector_irq 152 @ IRQ 152 handler |
| vector_irq 153 @ IRQ 153 handler |
| vector_irq 154 @ IRQ 154 handler |
| vector_irq 155 @ IRQ 155 handler |
| vector_irq 156 @ IRQ 156 handler |
| vector_irq 157 @ IRQ 157 handler |
| vector_irq 158 @ IRQ 158 handler |
| vector_irq 159 @ IRQ 159 handler |
| vector_irq 160 @ IRQ 160 handler |
| vector_irq 161 @ IRQ 161 handler |
| vector_irq 162 @ IRQ 162 handler |
| vector_irq 163 @ IRQ 163 handler |
| vector_irq 164 @ IRQ 164 handler |
| vector_irq 165 @ IRQ 165 handler |
| vector_irq 166 @ IRQ 166 handler |
| vector_irq 167 @ IRQ 167 handler |
| vector_irq 168 @ IRQ 168 handler |
| vector_irq 169 @ IRQ 169 handler |
| vector_irq 170 @ IRQ 170 handler |
| vector_irq 171 @ IRQ 171 handler |
| vector_irq 172 @ IRQ 172 handler |
| vector_irq 173 @ IRQ 173 handler |
| vector_irq 174 @ IRQ 174 handler |
| vector_irq 175 @ IRQ 175 handler |
| vector_irq 176 @ IRQ 176 handler |
| vector_irq 177 @ IRQ 177 handler |
| vector_irq 178 @ IRQ 178 handler |
| vector_irq 179 @ IRQ 179 handler |
| vector_irq 180 @ IRQ 180 handler |
| vector_irq 181 @ IRQ 181 handler |
| vector_irq 182 @ IRQ 182 handler |
| vector_irq 183 @ IRQ 183 handler |
| vector_irq 184 @ IRQ 184 handler |
| vector_irq 185 @ IRQ 185 handler |
| vector_irq 186 @ IRQ 186 handler |
| vector_irq 187 @ IRQ 187 handler |
| vector_irq 188 @ IRQ 188 handler |
| vector_irq 189 @ IRQ 189 handler |
| vector_irq 190 @ IRQ 190 handler |
| vector_irq 191 @ IRQ 191 handler |
| vector_irq 192 @ IRQ 192 handler |
| vector_irq 193 @ IRQ 193 handler |
| vector_irq 194 @ IRQ 194 handler |
| vector_irq 195 @ IRQ 195 handler |
| vector_irq 196 @ IRQ 196 handler |
| vector_irq 197 @ IRQ 197 handler |
| vector_irq 198 @ IRQ 198 handler |
| vector_irq 199 @ IRQ 199 handler |
| vector_irq 200 @ IRQ 200 handler |
| vector_irq 201 @ IRQ 201 handler |
| vector_irq 202 @ IRQ 202 handler |
| vector_irq 203 @ IRQ 203 handler |
| vector_irq 204 @ IRQ 204 handler |
| vector_irq 205 @ IRQ 205 handler |
| vector_irq 206 @ IRQ 206 handler |
| vector_irq 207 @ IRQ 207 handler |
| vector_irq 208 @ IRQ 208 handler |
| vector_irq 209 @ IRQ 209 handler |
| vector_irq 210 @ IRQ 210 handler |
| vector_irq 211 @ IRQ 211 handler |
| vector_irq 212 @ IRQ 212 handler |
| vector_irq 213 @ IRQ 213 handler |
| vector_irq 214 @ IRQ 214 handler |
| vector_irq 215 @ IRQ 215 handler |
| vector_irq 216 @ IRQ 216 handler |
| vector_irq 217 @ IRQ 217 handler |
| vector_irq 218 @ IRQ 218 handler |
| vector_irq 219 @ IRQ 219 handler |
| vector_irq 220 @ IRQ 220 handler |
| vector_irq 221 @ IRQ 221 handler |
| vector_irq 222 @ IRQ 222 handler |
| vector_irq 223 @ IRQ 223 handler |
| vector_irq 224 @ IRQ 224 handler |
| vector_irq 225 @ IRQ 225 handler |
| vector_irq 226 @ IRQ 226 handler |
| vector_irq 227 @ IRQ 227 handler |
| vector_irq 228 @ IRQ 228 handler |
| vector_irq 229 @ IRQ 229 handler |
| vector_irq 230 @ IRQ 230 handler |
| vector_irq 231 @ IRQ 231 handler |
| vector_irq 232 @ IRQ 232 handler |
| vector_irq 233 @ IRQ 233 handler |
| vector_irq 234 @ IRQ 234 handler |
| vector_irq 235 @ IRQ 235 handler |
| vector_irq 236 @ IRQ 236 handler |
| vector_irq 237 @ IRQ 237 handler |
| vector_irq 238 @ IRQ 238 handler |
| vector_irq 239 @ IRQ 239 handler |
| vector_irq 240 @ IRQ 240 handler |
| vector_irq 241 @ IRQ 241 handler |
| vector_irq 242 @ IRQ 242 handler |
| vector_irq 243 @ IRQ 243 handler |
| vector_irq 244 @ IRQ 244 handler |
| vector_irq 245 @ IRQ 245 handler |
| vector_irq 246 @ IRQ 246 handler |
| vector_irq 247 @ IRQ 247 handler |
| vector_irq 248 @ IRQ 248 handler |
| vector_irq 249 @ IRQ 249 handler |
| vector_irq 250 @ IRQ 250 handler |
| vector_irq 251 @ IRQ 251 handler |
| vector_irq 252 @ IRQ 252 handler |
| vector_irq 253 @ IRQ 253 handler |
| vector_irq 254 @ IRQ 254 handler |
| |
| .text |
| .syntax unified |
| .code 16 |
| |
| .global reset |
| .thumb_func |
| reset: |
| /* |
| * Ensure we're in privileged mode with main stack. Necessary if |
| * we've jumped directly here from another image after task_start(). |
| */ |
| #ifdef CONFIG_FPU |
| mov r0, #(1 << 2) @ priv. mode / main stack / floating point on |
| #else |
| mov r0, #0 @ priv. mode / main stack / no floating point |
| #endif |
| msr control, r0 |
| isb @ ensure the write is done |
| |
| /* Set the vector table on our current code */ |
| ldr r1, =vectors |
| ldr r2, =0xE000ED08 /* VTABLE register in SCB*/ |
| str r1, [r2] |
| |
| /* Clear BSS */ |
| mov r0, #0 |
| ldr r1,_bss_start |
| ldr r2,_bss_end |
| bss_loop: |
| cmp r1, r2 |
| it lt |
| strlt r0, [r1], #4 |
| blt bss_loop |
| |
| /* Copy initialized data to Internal RAM */ |
| ldr r0,_ro_end |
| ldr r1,_data_start |
| ldr r2,_data_end |
| data_loop: |
| ldr r3, [r0], #4 |
| cmp r1, r2 |
| it lt |
| strlt r3, [r1], #4 |
| blt data_loop |
| |
| /* |
| * Set stack pointer. Already done by Cortex-M hardware, but re-doing |
| * this here allows software to jump directly to the reset vector. |
| */ |
| ldr r0, =stack_end |
| mov sp, r0 |
| |
| #ifdef CONFIG_FPU |
| /* Enable FPU */ |
| /* CPACR is located at address 0xE000ED88 */ |
| ldr r0, =0xE000ED88 |
| /* Read CPACR */ |
| ldr r1, [r0] |
| /* Set bits 20-23 to enable CP10 and CP11 coprocessors */ |
| orr r1, r1, #(0xF << 20) |
| /* Write back the modified value to the CPACR */ |
| str r1, [r0] /* wait for store to complete */ |
| dsb |
| /* reset pipeline now the FPU is enabled */ |
| isb |
| #endif /* CONFIG_FPU */ |
| |
| #ifdef CONFIG_DEBUG_DISABLE_WRITE_BUFFER |
| /* Disable write buffer used for default memory map accesses */ |
| ldr r0, =0xE000E008 /* Load address of ACTLR */ |
| ldr r1, [r0] /* Read ACTLR */ |
| orr r1, r1, #2 /* Set DISDEFWBUF bit */ |
| str r1, [r0] /* Write back ACTLR */ |
| dsb /* Wait for store to complete */ |
| isb /* Reset pipeline */ |
| #endif /* CONFIG_DEBUG_DISABLE_WRITE_BUFFER */ |
| |
| /* Jump to C code */ |
| bl main |
| |
| /* That should not return. If it does, loop forever. */ |
| fini_loop: |
| b fini_loop |
| |
| /* Default exception handler */ |
| .thumb_func |
| default_handler: |
| b exception_panic |
| |
| /* |
| * SVC handler helper |
| * |
| * Work around issue where a late exception can corrupt r0 to r3, |
| * see section 2.7 (svc) of Cortex-M3 Application Note 179: |
| * http://infocenter.arm.com/help/topic/com.arm.doc.dai0179b/AppsNote179.pdf |
| * |
| * This approach differs slightly from the one in the document, |
| * it only loads r0 (desched) and r1 (resched) for svc_handler. |
| */ |
| .thumb_func |
| svc_helper_handler: |
| tst lr, #4 /* see if called from supervisor mode */ |
| mrs r2, msp /* get the correct stack pointer into r2 */ |
| it ne |
| mrsne r2, psp |
| ldr r1, [r2, #4] /* get regs from stack frame */ |
| ldr r0, [r2] |
| b svc_handler /* call svc_handler */ |
| |
| /* Call default_handler if svc_handler is not found (task.c is not built) */ |
| .weak svc_handler |
| .set svc_handler, default_handler |
| |
| .align 2 |
| _bss_start: |
| .long __bss_start |
| _bss_end: |
| .long __bss_end |
| _data_start: |
| .long __data_start |
| _data_end: |
| .long __data_end |
| _ro_end: |
| .long __ro_end |
| |
| /* Dummy functions to avoid linker complaints */ |
| .global __aeabi_unwind_cpp_pr0 |
| .global __aeabi_unwind_cpp_pr1 |
| .global __aeabi_unwind_cpp_pr2 |
| __aeabi_unwind_cpp_pr0: |
| __aeabi_unwind_cpp_pr1: |
| __aeabi_unwind_cpp_pr2: |
| bx lr |
| |
| /* Reserve space for system stack */ |
| .section .bss.system_stack |
| stack_start: |
| .space CONFIG_STACK_SIZE, 0 |
| stack_end: |
| .global stack_end |
| |
