Albert ARIBAUD | 9852cc6 | 2014-04-15 16:13:51 +0200 | [diff] [blame] | 1 | /* |
| 2 | * vectors - Generic ARM exception table code |
| 3 | * |
| 4 | * Copyright (c) 1998 Dan Malek <dmalek@jlc.net> |
| 5 | * Copyright (c) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se> |
| 6 | * Copyright (c) 2000 Wolfgang Denk <wd@denx.de> |
| 7 | * Copyright (c) 2001 Alex Züpke <azu@sysgo.de> |
| 8 | * Copyright (c) 2001 Marius Gröger <mag@sysgo.de> |
| 9 | * Copyright (c) 2002 Alex Züpke <azu@sysgo.de> |
| 10 | * Copyright (c) 2002 Gary Jennejohn <garyj@denx.de> |
| 11 | * Copyright (c) 2002 Kyle Harris <kharris@nexus-tech.net> |
| 12 | * |
| 13 | * SPDX-License-Identifier: GPL-2.0+ |
| 14 | */ |
| 15 | |
Christian Riesch | 80c5a53 | 2014-07-07 11:07:25 +0200 | [diff] [blame] | 16 | #include <config.h> |
| 17 | |
Albert ARIBAUD | 9852cc6 | 2014-04-15 16:13:51 +0200 | [diff] [blame] | 18 | /* |
| 19 | ************************************************************************* |
| 20 | * |
| 21 | * Symbol _start is referenced elsewhere, so make it global |
| 22 | * |
| 23 | ************************************************************************* |
| 24 | */ |
| 25 | |
| 26 | .globl _start |
| 27 | |
| 28 | /* |
| 29 | ************************************************************************* |
| 30 | * |
| 31 | * Vectors have their own section so linker script can map them easily |
| 32 | * |
| 33 | ************************************************************************* |
| 34 | */ |
| 35 | |
Georges Savoundararadj | c381084 | 2014-10-28 23:16:10 +0100 | [diff] [blame] | 36 | .section ".vectors", "ax" |
Albert ARIBAUD | 9852cc6 | 2014-04-15 16:13:51 +0200 | [diff] [blame] | 37 | |
| 38 | /* |
| 39 | ************************************************************************* |
| 40 | * |
| 41 | * Exception vectors as described in ARM reference manuals |
| 42 | * |
| 43 | * Uses indirect branch to allow reaching handlers anywhere in memory. |
| 44 | * |
| 45 | ************************************************************************* |
| 46 | */ |
| 47 | |
Benoît Thébaudeau | df66ec6 | 2014-09-03 23:32:34 +0200 | [diff] [blame] | 48 | _start: |
| 49 | |
Albert ARIBAUD | 9852cc6 | 2014-04-15 16:13:51 +0200 | [diff] [blame] | 50 | #ifdef CONFIG_SYS_DV_NOR_BOOT_CFG |
| 51 | .word CONFIG_SYS_DV_NOR_BOOT_CFG |
| 52 | #endif |
| 53 | |
Benoît Thébaudeau | 68a0f16 | 2014-09-03 23:32:33 +0200 | [diff] [blame] | 54 | b reset |
Albert ARIBAUD | 9852cc6 | 2014-04-15 16:13:51 +0200 | [diff] [blame] | 55 | ldr pc, _undefined_instruction |
| 56 | ldr pc, _software_interrupt |
| 57 | ldr pc, _prefetch_abort |
| 58 | ldr pc, _data_abort |
| 59 | ldr pc, _not_used |
| 60 | ldr pc, _irq |
| 61 | ldr pc, _fiq |
| 62 | |
Andre Przywara | 48321ba | 2016-05-31 10:45:06 -0700 | [diff] [blame] | 63 | #ifdef CONFIG_ENABLE_ARM_SOC_BOOT0_HOOK |
| 64 | /* |
| 65 | * Various SoCs need something special and SoC-specific up front in |
| 66 | * order to boot, allow them to set that in their boot0.h file and then |
| 67 | * use it here. |
| 68 | */ |
| 69 | #include <asm/arch/boot0.h> |
Andre Przywara | 48321ba | 2016-05-31 10:45:06 -0700 | [diff] [blame] | 70 | #endif |
| 71 | |
Albert ARIBAUD | 9852cc6 | 2014-04-15 16:13:51 +0200 | [diff] [blame] | 72 | /* |
| 73 | ************************************************************************* |
| 74 | * |
| 75 | * Indirect vectors table |
| 76 | * |
| 77 | * Symbols referenced here must be defined somewhere else |
| 78 | * |
| 79 | ************************************************************************* |
| 80 | */ |
| 81 | |
| 82 | .globl _undefined_instruction |
| 83 | .globl _software_interrupt |
| 84 | .globl _prefetch_abort |
| 85 | .globl _data_abort |
| 86 | .globl _not_used |
| 87 | .globl _irq |
| 88 | .globl _fiq |
| 89 | |
Albert ARIBAUD | 9852cc6 | 2014-04-15 16:13:51 +0200 | [diff] [blame] | 90 | _undefined_instruction: .word undefined_instruction |
| 91 | _software_interrupt: .word software_interrupt |
| 92 | _prefetch_abort: .word prefetch_abort |
| 93 | _data_abort: .word data_abort |
| 94 | _not_used: .word not_used |
| 95 | _irq: .word irq |
| 96 | _fiq: .word fiq |
| 97 | |
| 98 | .balignl 16,0xdeadbeef |
| 99 | |
| 100 | /* |
| 101 | ************************************************************************* |
| 102 | * |
| 103 | * Interrupt handling |
| 104 | * |
| 105 | ************************************************************************* |
| 106 | */ |
| 107 | |
| 108 | /* SPL interrupt handling: just hang */ |
| 109 | |
| 110 | #ifdef CONFIG_SPL_BUILD |
| 111 | |
| 112 | .align 5 |
| 113 | undefined_instruction: |
| 114 | software_interrupt: |
| 115 | prefetch_abort: |
| 116 | data_abort: |
| 117 | not_used: |
| 118 | irq: |
| 119 | fiq: |
| 120 | |
| 121 | 1: |
| 122 | bl 1b /* hang and never return */ |
| 123 | |
| 124 | #else /* !CONFIG_SPL_BUILD */ |
| 125 | |
| 126 | /* IRQ stack memory (calculated at run-time) + 8 bytes */ |
| 127 | .globl IRQ_STACK_START_IN |
| 128 | IRQ_STACK_START_IN: |
| 129 | .word 0x0badc0de |
| 130 | |
Albert ARIBAUD | 9852cc6 | 2014-04-15 16:13:51 +0200 | [diff] [blame] | 131 | @ |
| 132 | @ IRQ stack frame. |
| 133 | @ |
| 134 | #define S_FRAME_SIZE 72 |
| 135 | |
| 136 | #define S_OLD_R0 68 |
| 137 | #define S_PSR 64 |
| 138 | #define S_PC 60 |
| 139 | #define S_LR 56 |
| 140 | #define S_SP 52 |
| 141 | |
| 142 | #define S_IP 48 |
| 143 | #define S_FP 44 |
| 144 | #define S_R10 40 |
| 145 | #define S_R9 36 |
| 146 | #define S_R8 32 |
| 147 | #define S_R7 28 |
| 148 | #define S_R6 24 |
| 149 | #define S_R5 20 |
| 150 | #define S_R4 16 |
| 151 | #define S_R3 12 |
| 152 | #define S_R2 8 |
| 153 | #define S_R1 4 |
| 154 | #define S_R0 0 |
| 155 | |
| 156 | #define MODE_SVC 0x13 |
| 157 | #define I_BIT 0x80 |
| 158 | |
| 159 | /* |
| 160 | * use bad_save_user_regs for abort/prefetch/undef/swi ... |
| 161 | * use irq_save_user_regs / irq_restore_user_regs for IRQ/FIQ handling |
| 162 | */ |
| 163 | |
| 164 | .macro bad_save_user_regs |
| 165 | @ carve out a frame on current user stack |
| 166 | sub sp, sp, #S_FRAME_SIZE |
| 167 | stmia sp, {r0 - r12} @ Save user registers (now in svc mode) r0-r12 |
| 168 | ldr r2, IRQ_STACK_START_IN |
| 169 | @ get values for "aborted" pc and cpsr (into parm regs) |
| 170 | ldmia r2, {r2 - r3} |
| 171 | add r0, sp, #S_FRAME_SIZE @ grab pointer to old stack |
| 172 | add r5, sp, #S_SP |
| 173 | mov r1, lr |
| 174 | stmia r5, {r0 - r3} @ save sp_SVC, lr_SVC, pc, cpsr |
| 175 | mov r0, sp @ save current stack into r0 (param register) |
| 176 | .endm |
| 177 | |
| 178 | .macro irq_save_user_regs |
| 179 | sub sp, sp, #S_FRAME_SIZE |
| 180 | stmia sp, {r0 - r12} @ Calling r0-r12 |
| 181 | @ !!!! R8 NEEDS to be saved !!!! a reserved stack spot would be good. |
| 182 | add r8, sp, #S_PC |
| 183 | stmdb r8, {sp, lr}^ @ Calling SP, LR |
| 184 | str lr, [r8, #0] @ Save calling PC |
| 185 | mrs r6, spsr |
| 186 | str r6, [r8, #4] @ Save CPSR |
| 187 | str r0, [r8, #8] @ Save OLD_R0 |
| 188 | mov r0, sp |
| 189 | .endm |
| 190 | |
| 191 | .macro irq_restore_user_regs |
| 192 | ldmia sp, {r0 - lr}^ @ Calling r0 - lr |
| 193 | mov r0, r0 |
| 194 | ldr lr, [sp, #S_PC] @ Get PC |
| 195 | add sp, sp, #S_FRAME_SIZE |
| 196 | subs pc, lr, #4 @ return & move spsr_svc into cpsr |
| 197 | .endm |
| 198 | |
| 199 | .macro get_bad_stack |
| 200 | ldr r13, IRQ_STACK_START_IN @ setup our mode stack |
| 201 | |
| 202 | str lr, [r13] @ save caller lr in position 0 of saved stack |
| 203 | mrs lr, spsr @ get the spsr |
| 204 | str lr, [r13, #4] @ save spsr in position 1 of saved stack |
| 205 | mov r13, #MODE_SVC @ prepare SVC-Mode |
| 206 | @ msr spsr_c, r13 |
| 207 | msr spsr, r13 @ switch modes, make sure moves will execute |
| 208 | mov lr, pc @ capture return pc |
| 209 | movs pc, lr @ jump to next instruction & switch modes. |
| 210 | .endm |
| 211 | |
| 212 | .macro get_irq_stack @ setup IRQ stack |
| 213 | ldr sp, IRQ_STACK_START |
| 214 | .endm |
| 215 | |
| 216 | .macro get_fiq_stack @ setup FIQ stack |
| 217 | ldr sp, FIQ_STACK_START |
| 218 | .endm |
| 219 | |
| 220 | /* |
| 221 | * exception handlers |
| 222 | */ |
| 223 | |
| 224 | .align 5 |
| 225 | undefined_instruction: |
| 226 | get_bad_stack |
| 227 | bad_save_user_regs |
| 228 | bl do_undefined_instruction |
| 229 | |
| 230 | .align 5 |
| 231 | software_interrupt: |
| 232 | get_bad_stack |
| 233 | bad_save_user_regs |
| 234 | bl do_software_interrupt |
| 235 | |
| 236 | .align 5 |
| 237 | prefetch_abort: |
| 238 | get_bad_stack |
| 239 | bad_save_user_regs |
| 240 | bl do_prefetch_abort |
| 241 | |
| 242 | .align 5 |
| 243 | data_abort: |
| 244 | get_bad_stack |
| 245 | bad_save_user_regs |
| 246 | bl do_data_abort |
| 247 | |
| 248 | .align 5 |
| 249 | not_used: |
| 250 | get_bad_stack |
| 251 | bad_save_user_regs |
| 252 | bl do_not_used |
| 253 | |
Albert ARIBAUD | 9852cc6 | 2014-04-15 16:13:51 +0200 | [diff] [blame] | 254 | |
| 255 | .align 5 |
| 256 | irq: |
Albert ARIBAUD | 9852cc6 | 2014-04-15 16:13:51 +0200 | [diff] [blame] | 257 | get_bad_stack |
| 258 | bad_save_user_regs |
| 259 | bl do_irq |
| 260 | |
| 261 | .align 5 |
| 262 | fiq: |
| 263 | get_bad_stack |
| 264 | bad_save_user_regs |
| 265 | bl do_fiq |
| 266 | |
Albert ARIBAUD | 9852cc6 | 2014-04-15 16:13:51 +0200 | [diff] [blame] | 267 | #endif /* CONFIG_SPL_BUILD */ |