Exception handling is basically identical for all ARM targets. Factorize it out of the various start.S files and into a single vectors.S file, and adjust linker scripts accordingly. Signed-off-by: Albert ARIBAUD <albert.u.boot@aribaud.net>master
Albert ARIBAUD
10 years ago
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60a4f39fcd
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/* |
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* vectors - Generic ARM exception table code |
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* |
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* Copyright (c) 1998 Dan Malek <dmalek@jlc.net>
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* Copyright (c) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se> |
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* Copyright (c) 2000 Wolfgang Denk <wd@denx.de>
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* Copyright (c) 2001 Alex Züpke <azu@sysgo.de>
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* Copyright (c) 2001 Marius Gröger <mag@sysgo.de>
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* Copyright (c) 2002 Alex Züpke <azu@sysgo.de>
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* Copyright (c) 2002 Gary Jennejohn <garyj@denx.de>
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* Copyright (c) 2002 Kyle Harris <kharris@nexus-tech.net>
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* |
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* SPDX-License-Identifier: GPL-2.0+ |
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*/ |
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/* |
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************************************************************************* |
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* |
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* Symbol _start is referenced elsewhere, so make it global |
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* |
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************************************************************************* |
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*/ |
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.globl _start
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/* |
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************************************************************************* |
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* |
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* Vectors have their own section so linker script can map them easily |
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* |
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************************************************************************* |
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*/ |
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.section ".vectors", "x" |
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/* |
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************************************************************************* |
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* |
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* Exception vectors as described in ARM reference manuals |
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* |
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* Uses indirect branch to allow reaching handlers anywhere in memory. |
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* |
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************************************************************************* |
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*/ |
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_start: |
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#ifdef CONFIG_SYS_DV_NOR_BOOT_CFG |
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.word CONFIG_SYS_DV_NOR_BOOT_CFG
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#endif |
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_start: |
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ldr pc, _reset |
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ldr pc, _undefined_instruction |
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ldr pc, _software_interrupt |
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ldr pc, _prefetch_abort |
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ldr pc, _data_abort |
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ldr pc, _not_used |
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ldr pc, _irq |
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ldr pc, _fiq |
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/* |
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************************************************************************* |
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* |
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* Indirect vectors table |
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* |
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* Symbols referenced here must be defined somewhere else |
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* |
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************************************************************************* |
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*/ |
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.globl _undefined_instruction
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.globl _software_interrupt
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.globl _prefetch_abort
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.globl _data_abort
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.globl _not_used
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.globl _irq
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.globl _fiq
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_reset: .word reset |
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_undefined_instruction: .word undefined_instruction |
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_software_interrupt: .word software_interrupt |
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_prefetch_abort: .word prefetch_abort |
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_data_abort: .word data_abort |
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_not_used: .word not_used |
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_irq: .word irq |
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_fiq: .word fiq |
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.balignl 16,0xdeadbeef |
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/* |
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************************************************************************* |
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* |
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* Interrupt handling |
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* |
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************************************************************************* |
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*/ |
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/* SPL interrupt handling: just hang */ |
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#ifdef CONFIG_SPL_BUILD |
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.align 5
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undefined_instruction: |
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software_interrupt: |
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prefetch_abort: |
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data_abort: |
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not_used: |
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irq: |
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fiq: |
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1: |
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bl 1b /* hang and never return */ |
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#else /* !CONFIG_SPL_BUILD */ |
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/* IRQ stack memory (calculated at run-time) + 8 bytes */ |
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.globl IRQ_STACK_START_IN
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IRQ_STACK_START_IN: |
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.word 0x0badc0de
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#ifdef CONFIG_USE_IRQ |
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/* IRQ stack memory (calculated at run-time) */ |
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.globl IRQ_STACK_START
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IRQ_STACK_START: |
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.word 0x0badc0de
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/* IRQ stack memory (calculated at run-time) */ |
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.globl FIQ_STACK_START
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FIQ_STACK_START: |
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.word 0x0badc0de
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#endif /* CONFIG_USE_IRQ */ |
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@
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@ IRQ stack frame.
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@
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#define S_FRAME_SIZE 72 |
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#define S_OLD_R0 68 |
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#define S_PSR 64 |
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#define S_PC 60 |
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#define S_LR 56 |
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#define S_SP 52 |
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#define S_IP 48 |
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#define S_FP 44 |
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#define S_R10 40 |
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#define S_R9 36 |
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#define S_R8 32 |
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#define S_R7 28 |
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#define S_R6 24 |
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#define S_R5 20 |
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#define S_R4 16 |
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#define S_R3 12 |
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#define S_R2 8 |
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#define S_R1 4 |
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#define S_R0 0 |
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#define MODE_SVC 0x13 |
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#define I_BIT 0x80 |
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/* |
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* use bad_save_user_regs for abort/prefetch/undef/swi ... |
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* use irq_save_user_regs / irq_restore_user_regs for IRQ/FIQ handling |
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*/ |
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.macro bad_save_user_regs
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@ carve out a frame on current user stack
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sub sp, sp, #S_FRAME_SIZE |
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stmia sp, {r0 - r12} @ Save user registers (now in svc mode) r0-r12
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ldr r2, IRQ_STACK_START_IN |
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@ get values for "aborted" pc and cpsr (into parm regs)
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ldmia r2, {r2 - r3} |
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add r0, sp, #S_FRAME_SIZE @ grab pointer to old stack |
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add r5, sp, #S_SP |
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mov r1, lr |
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stmia r5, {r0 - r3} @ save sp_SVC, lr_SVC, pc, cpsr
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mov r0, sp @ save current stack into r0 (param register)
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.endm |
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.macro irq_save_user_regs
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sub sp, sp, #S_FRAME_SIZE |
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stmia sp, {r0 - r12} @ Calling r0-r12
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@ !!!! R8 NEEDS to be saved !!!! a reserved stack spot would be good.
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add r8, sp, #S_PC |
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stmdb r8, {sp, lr}^ @ Calling SP, LR
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str lr, [r8, #0] @ Save calling PC
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mrs r6, spsr |
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str r6, [r8, #4] @ Save CPSR
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str r0, [r8, #8] @ Save OLD_R0
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mov r0, sp |
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.endm |
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.macro irq_restore_user_regs
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ldmia sp, {r0 - lr}^ @ Calling r0 - lr
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mov r0, r0 |
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ldr lr, [sp, #S_PC] @ Get PC |
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add sp, sp, #S_FRAME_SIZE |
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subs pc, lr, #4 @ return & move spsr_svc into cpsr
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.endm |
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.macro get_bad_stack
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ldr r13, IRQ_STACK_START_IN @ setup our mode stack
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str lr, [r13] @ save caller lr in position 0 of saved stack
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mrs lr, spsr @ get the spsr
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str lr, [r13, #4] @ save spsr in position 1 of saved stack
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mov r13, #MODE_SVC @ prepare SVC-Mode |
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@ msr spsr_c, r13
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msr spsr, r13 @ switch modes, make sure moves will execute
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mov lr, pc @ capture return pc
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movs pc, lr @ jump to next instruction & switch modes.
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.endm |
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.macro get_irq_stack @ setup IRQ stack
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ldr sp, IRQ_STACK_START |
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.endm |
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.macro get_fiq_stack @ setup FIQ stack
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ldr sp, FIQ_STACK_START |
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.endm |
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/* |
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* exception handlers |
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*/ |
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.align 5
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undefined_instruction: |
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get_bad_stack |
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bad_save_user_regs |
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bl do_undefined_instruction |
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.align 5
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software_interrupt: |
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get_bad_stack |
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bad_save_user_regs |
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bl do_software_interrupt |
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.align 5
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prefetch_abort: |
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get_bad_stack |
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bad_save_user_regs |
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bl do_prefetch_abort |
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.align 5
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data_abort: |
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get_bad_stack |
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bad_save_user_regs |
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bl do_data_abort |
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.align 5
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not_used: |
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get_bad_stack |
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bad_save_user_regs |
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bl do_not_used |
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#ifdef CONFIG_USE_IRQ |
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.align 5
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irq: |
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get_irq_stack |
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irq_save_user_regs |
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bl do_irq |
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irq_restore_user_regs |
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.align 5
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fiq: |
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get_fiq_stack |
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/* someone ought to write a more effiction fiq_save_user_regs */ |
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irq_save_user_regs |
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bl do_fiq |
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irq_restore_user_regs |
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#else |
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.align 5
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irq: |
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get_bad_stack |
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bad_save_user_regs |
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bl do_irq |
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.align 5
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fiq: |
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get_bad_stack |
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bad_save_user_regs |
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bl do_fiq |
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#endif /* CONFIG_USE_IRQ */ |
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#endif /* CONFIG_SPL_BUILD */ |
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