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+
19 *************************************************************************
21 * Symbol _start is referenced elsewhere, so make it global
23 *************************************************************************
29 *************************************************************************
31 * Vectors have their own section so linker script can map them easily
33 *************************************************************************
36 .section ".vectors", "ax"
39 *************************************************************************
41 * Exception vectors as described in ARM reference manuals
43 * Uses indirect branch to allow reaching handlers anywhere in memory.
45 *************************************************************************
50 #ifdef CONFIG_SYS_DV_NOR_BOOT_CFG
51 .word CONFIG_SYS_DV_NOR_BOOT_CFG
55 ldr pc, _undefined_instruction
56 ldr pc, _software_interrupt
57 ldr pc, _prefetch_abort
64 *************************************************************************
66 * Indirect vectors table
68 * Symbols referenced here must be defined somewhere else
70 *************************************************************************
73 .globl _undefined_instruction
74 .globl _software_interrupt
75 .globl _prefetch_abort
81 _undefined_instruction: .word undefined_instruction
82 _software_interrupt: .word software_interrupt
83 _prefetch_abort: .word prefetch_abort
84 _data_abort: .word data_abort
85 _not_used: .word not_used
89 .balignl 16,0xdeadbeef
92 *************************************************************************
96 *************************************************************************
99 /* SPL interrupt handling: just hang */
101 #ifdef CONFIG_SPL_BUILD
104 undefined_instruction:
113 bl 1b /* hang and never return */
115 #else /* !CONFIG_SPL_BUILD */
117 /* IRQ stack memory (calculated at run-time) + 8 bytes */
118 .globl IRQ_STACK_START_IN
122 #ifdef CONFIG_USE_IRQ
123 /* IRQ stack memory (calculated at run-time) */
124 .globl IRQ_STACK_START
128 /* IRQ stack memory (calculated at run-time) */
129 .globl FIQ_STACK_START
133 #endif /* CONFIG_USE_IRQ */
138 #define S_FRAME_SIZE 72
160 #define MODE_SVC 0x13
164 * use bad_save_user_regs for abort/prefetch/undef/swi ...
165 * use irq_save_user_regs / irq_restore_user_regs for IRQ/FIQ handling
168 .macro bad_save_user_regs
169 @ carve out a frame on current user stack
170 sub sp, sp, #S_FRAME_SIZE
171 stmia sp, {r0 - r12} @ Save user registers (now in svc mode) r0-r12
172 ldr r2, IRQ_STACK_START_IN
173 @ get values for "aborted" pc and cpsr (into parm regs)
175 add r0, sp, #S_FRAME_SIZE @ grab pointer to old stack
178 stmia r5, {r0 - r3} @ save sp_SVC, lr_SVC, pc, cpsr
179 mov r0, sp @ save current stack into r0 (param register)
182 .macro irq_save_user_regs
183 sub sp, sp, #S_FRAME_SIZE
184 stmia sp, {r0 - r12} @ Calling r0-r12
185 @ !!!! R8 NEEDS to be saved !!!! a reserved stack spot would be good.
187 stmdb r8, {sp, lr}^ @ Calling SP, LR
188 str lr, [r8, #0] @ Save calling PC
190 str r6, [r8, #4] @ Save CPSR
191 str r0, [r8, #8] @ Save OLD_R0
195 .macro irq_restore_user_regs
196 ldmia sp, {r0 - lr}^ @ Calling r0 - lr
198 ldr lr, [sp, #S_PC] @ Get PC
199 add sp, sp, #S_FRAME_SIZE
200 subs pc, lr, #4 @ return & move spsr_svc into cpsr
204 ldr r13, IRQ_STACK_START_IN @ setup our mode stack
206 str lr, [r13] @ save caller lr in position 0 of saved stack
207 mrs lr, spsr @ get the spsr
208 str lr, [r13, #4] @ save spsr in position 1 of saved stack
209 mov r13, #MODE_SVC @ prepare SVC-Mode
211 msr spsr, r13 @ switch modes, make sure moves will execute
212 mov lr, pc @ capture return pc
213 movs pc, lr @ jump to next instruction & switch modes.
216 .macro get_irq_stack @ setup IRQ stack
217 ldr sp, IRQ_STACK_START
220 .macro get_fiq_stack @ setup FIQ stack
221 ldr sp, FIQ_STACK_START
229 undefined_instruction:
232 bl do_undefined_instruction
238 bl do_software_interrupt
258 #ifdef CONFIG_USE_IRQ
265 irq_restore_user_regs
270 /* someone ought to write a more effiction fiq_save_user_regs */
273 irq_restore_user_regs
289 #endif /* CONFIG_USE_IRQ */
291 #endif /* CONFIG_SPL_BUILD */