2 * vectors - Generic ARM exception table code
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>
13 * SPDX-License-Identifier: GPL-2.0+
17 *************************************************************************
19 * Symbol _start is referenced elsewhere, so make it global
21 *************************************************************************
27 *************************************************************************
29 * Vectors have their own section so linker script can map them easily
31 *************************************************************************
34 .section ".vectors", "x"
37 *************************************************************************
39 * Exception vectors as described in ARM reference manuals
41 * Uses indirect branch to allow reaching handlers anywhere in memory.
43 *************************************************************************
46 #ifdef CONFIG_SYS_DV_NOR_BOOT_CFG
47 .word CONFIG_SYS_DV_NOR_BOOT_CFG
52 ldr pc, _undefined_instruction
53 ldr pc, _software_interrupt
54 ldr pc, _prefetch_abort
61 *************************************************************************
63 * Indirect vectors table
65 * Symbols referenced here must be defined somewhere else
67 *************************************************************************
70 .globl _undefined_instruction
71 .globl _software_interrupt
72 .globl _prefetch_abort
79 _undefined_instruction: .word undefined_instruction
80 _software_interrupt: .word software_interrupt
81 _prefetch_abort: .word prefetch_abort
82 _data_abort: .word data_abort
83 _not_used: .word not_used
87 .balignl 16,0xdeadbeef
90 *************************************************************************
94 *************************************************************************
97 /* SPL interrupt handling: just hang */
99 #ifdef CONFIG_SPL_BUILD
102 undefined_instruction:
111 bl 1b /* hang and never return */
113 #else /* !CONFIG_SPL_BUILD */
115 /* IRQ stack memory (calculated at run-time) + 8 bytes */
116 .globl IRQ_STACK_START_IN
120 #ifdef CONFIG_USE_IRQ
121 /* IRQ stack memory (calculated at run-time) */
122 .globl IRQ_STACK_START
126 /* IRQ stack memory (calculated at run-time) */
127 .globl FIQ_STACK_START
131 #endif /* CONFIG_USE_IRQ */
136 #define S_FRAME_SIZE 72
158 #define MODE_SVC 0x13
162 * use bad_save_user_regs for abort/prefetch/undef/swi ...
163 * use irq_save_user_regs / irq_restore_user_regs for IRQ/FIQ handling
166 .macro bad_save_user_regs
167 @ carve out a frame on current user stack
168 sub sp, sp, #S_FRAME_SIZE
169 stmia sp, {r0 - r12} @ Save user registers (now in svc mode) r0-r12
170 ldr r2, IRQ_STACK_START_IN
171 @ get values for "aborted" pc and cpsr (into parm regs)
173 add r0, sp, #S_FRAME_SIZE @ grab pointer to old stack
176 stmia r5, {r0 - r3} @ save sp_SVC, lr_SVC, pc, cpsr
177 mov r0, sp @ save current stack into r0 (param register)
180 .macro irq_save_user_regs
181 sub sp, sp, #S_FRAME_SIZE
182 stmia sp, {r0 - r12} @ Calling r0-r12
183 @ !!!! R8 NEEDS to be saved !!!! a reserved stack spot would be good.
185 stmdb r8, {sp, lr}^ @ Calling SP, LR
186 str lr, [r8, #0] @ Save calling PC
188 str r6, [r8, #4] @ Save CPSR
189 str r0, [r8, #8] @ Save OLD_R0
193 .macro irq_restore_user_regs
194 ldmia sp, {r0 - lr}^ @ Calling r0 - lr
196 ldr lr, [sp, #S_PC] @ Get PC
197 add sp, sp, #S_FRAME_SIZE
198 subs pc, lr, #4 @ return & move spsr_svc into cpsr
202 ldr r13, IRQ_STACK_START_IN @ setup our mode stack
204 str lr, [r13] @ save caller lr in position 0 of saved stack
205 mrs lr, spsr @ get the spsr
206 str lr, [r13, #4] @ save spsr in position 1 of saved stack
207 mov r13, #MODE_SVC @ prepare SVC-Mode
209 msr spsr, r13 @ switch modes, make sure moves will execute
210 mov lr, pc @ capture return pc
211 movs pc, lr @ jump to next instruction & switch modes.
214 .macro get_irq_stack @ setup IRQ stack
215 ldr sp, IRQ_STACK_START
218 .macro get_fiq_stack @ setup FIQ stack
219 ldr sp, FIQ_STACK_START
227 undefined_instruction:
230 bl do_undefined_instruction
236 bl do_software_interrupt
256 #ifdef CONFIG_USE_IRQ
263 irq_restore_user_regs
268 /* someone ought to write a more effiction fiq_save_user_regs */
271 irq_restore_user_regs
287 #endif /* CONFIG_USE_IRQ */
289 #endif /* CONFIG_SPL_BUILD */