arm: move exception handling out of start.S files

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>

1 files changed, 1 insertions, 241 deletions

diff --git a/arch/arm/cpu/arm1136/start.S b/arch/arm/cpu/arm1136/start.S
index 13567b9..1cfcca9 100644
--- a/arch/arm/cpu/arm1136/start.S
+++ b/arch/arm/cpu/arm1136/start.S
@@ -15,46 +15,7 @@
 #include <asm-offsets.h>
 #include <config.h>
 #include <version.h>
-.globl _start
-_start: b	reset
-#ifdef CONFIG_SPL_BUILD
-	ldr	pc, _hang
-	ldr	pc, _hang
-	ldr	pc, _hang
-	ldr	pc, _hang
-	ldr	pc, _hang
-	ldr	pc, _hang
-	ldr	pc, _hang
 
-_hang:
-	.word	do_hang
-	.word	0x12345678
-	.word	0x12345678
-	.word	0x12345678
-	.word	0x12345678
-	.word	0x12345678
-	.word	0x12345678
-	.word	0x12345678	/* now 16*4=64 */
-#else
-	ldr	pc, _undefined_instruction
-	ldr	pc, _software_interrupt
-	ldr	pc, _prefetch_abort
-	ldr	pc, _data_abort
-	ldr	pc, _not_used
-	ldr	pc, _irq
-	ldr	pc, _fiq
-
-_undefined_instruction: .word undefined_instruction
-_software_interrupt:	.word software_interrupt
-_prefetch_abort:	.word prefetch_abort
-_data_abort:		.word data_abort
-_not_used:		.word not_used
-_irq:			.word irq
-_fiq:			.word fiq
-_pad:			.word 0x12345678 /* now 16*4=64 */
-#endif	/* CONFIG_SPL_BUILD */
-
-	.balignl 16,0xdeadbeef
 /*
  *************************************************************************
  *
@@ -68,26 +29,7 @@ _pad:			.word 0x12345678 /* now 16*4=64 */
  *************************************************************************
  */
 
-#ifdef CONFIG_USE_IRQ
-/* IRQ stack memory (calculated at run-time) */
-.globl IRQ_STACK_START
-IRQ_STACK_START:
-	.word	0x0badc0de
-
-/* IRQ stack memory (calculated at run-time) */
-.globl FIQ_STACK_START
-FIQ_STACK_START:
-	.word 0x0badc0de
-#endif
-
-/* IRQ stack memory (calculated at run-time) + 8 bytes */
-.globl IRQ_STACK_START_IN
-IRQ_STACK_START_IN:
-	.word	0x0badc0de
-
-/*
- * the actual reset code
- */
+	.globl	reset
 
 reset:
 	/*
@@ -150,185 +92,3 @@ cpu_init_crit:
 	mov	lr, ip		/* restore link */
 	mov	pc, lr		/* back to my caller */
 #endif /* CONFIG_SKIP_LOWLEVEL_INIT */
-
-#ifndef CONFIG_SPL_BUILD
-/*
- *************************************************************************
- *
- * Interrupt handling
- *
- *************************************************************************
- */
-@
-@ IRQ stack frame.
-@
-#define S_FRAME_SIZE	72
-
-#define S_OLD_R0	68
-#define S_PSR		64
-#define S_PC		60
-#define S_LR		56
-#define S_SP		52
-
-#define S_IP		48
-#define S_FP		44
-#define S_R10		40
-#define S_R9		36
-#define S_R8		32
-#define S_R7		28
-#define S_R6		24
-#define S_R5		20
-#define S_R4		16
-#define S_R3		12
-#define S_R2		8
-#define S_R1		4
-#define S_R0		0
-
-#define MODE_SVC 0x13
-#define I_BIT	 0x80
-
-/*
- * use bad_save_user_regs for abort/prefetch/undef/swi ...
- * use irq_save_user_regs / irq_restore_user_regs for IRQ/FIQ handling
- */
-
-	.macro	bad_save_user_regs
-	sub	sp, sp, #S_FRAME_SIZE		@ carve out a frame on current user stack
-	stmia	sp, {r0 - r12}			@ Save user registers (now in svc mode) r0-r12
-
-	ldr	r2, IRQ_STACK_START_IN		@ set base 2 words into abort stack
-	ldmia	r2, {r2 - r3}			@ get values for "aborted" pc and cpsr (into parm regs)
-	add	r0, sp, #S_FRAME_SIZE		@ grab pointer to old stack
-
-	add	r5, sp, #S_SP
-	mov	r1, lr
-	stmia	r5, {r0 - r3}			@ save sp_SVC, lr_SVC, pc, cpsr
-	mov	r0, sp				@ save current stack into r0 (param register)
-	.endm
-
-	.macro	irq_save_user_regs
-	sub	sp, sp, #S_FRAME_SIZE
-	stmia	sp, {r0 - r12}			@ Calling r0-r12
-	add	r8, sp, #S_PC			@ !!!! R8 NEEDS to be saved !!!! a reserved stack spot would be good.
-	stmdb	r8, {sp, lr}^			@ Calling SP, LR
-	str	lr, [r8, #0]			@ Save calling PC
-	mrs	r6, spsr
-	str	r6, [r8, #4]			@ Save CPSR
-	str	r0, [r8, #8]			@ Save OLD_R0
-	mov	r0, sp
-	.endm
-
-	.macro	irq_restore_user_regs
-	ldmia	sp, {r0 - lr}^			@ Calling r0 - lr
-	mov	r0, r0
-	ldr	lr, [sp, #S_PC]			@ Get PC
-	add	sp, sp, #S_FRAME_SIZE
-	subs	pc, lr, #4			@ return & move spsr_svc into cpsr
-	.endm
-
-	.macro get_bad_stack
-	ldr	r13, IRQ_STACK_START_IN		@ setup our mode stack (enter in banked mode)
-
-	str	lr, [r13]			@ save caller lr in position 0 of saved stack
-	mrs	lr, spsr			@ get the spsr
-	str	lr, [r13, #4]			@ save spsr in position 1 of saved stack
-
-	mov	r13, #MODE_SVC			@ prepare SVC-Mode
-	@ msr	spsr_c, r13
-	msr	spsr, r13			@ switch modes, make sure moves will execute
-	mov	lr, pc				@ capture return pc
-	movs	pc, lr				@ jump to next instruction & switch modes.
-	.endm
-
-	.macro get_bad_stack_swi
-	sub	r13, r13, #4			@ space on current stack for scratch reg.
-	str	r0, [r13]			@ save R0's value.
-	ldr	r0, IRQ_STACK_START_IN		@ get data regions start
-	str	lr, [r0]			@ save caller lr in position 0 of saved stack
-	mrs	lr, spsr			@ get the spsr
-	str	lr, [r0, #4]			@ save spsr in position 1 of saved stack
-	ldr	lr, [r0]			@ restore lr
-	ldr	r0, [r13]			@ restore r0
-	add	r13, r13, #4			@ pop stack entry
-	.endm
-
-	.macro get_irq_stack			@ setup IRQ stack
-	ldr	sp, IRQ_STACK_START
-	.endm
-
-	.macro get_fiq_stack			@ setup FIQ stack
-	ldr	sp, FIQ_STACK_START
-	.endm
-#endif	/* CONFIG_SPL_BUILD */
-
-/*
- * exception handlers
- */
-#ifdef CONFIG_SPL_BUILD
-	.align	5
-do_hang:
-	bl	hang				/* hang and never return */
-#else	/* !CONFIG_SPL_BUILD */
-	.align	5
-undefined_instruction:
-	get_bad_stack
-	bad_save_user_regs
-	bl	do_undefined_instruction
-
-	.align	5
-software_interrupt:
-	get_bad_stack_swi
-	bad_save_user_regs
-	bl	do_software_interrupt
-
-	.align	5
-prefetch_abort:
-	get_bad_stack
-	bad_save_user_regs
-	bl	do_prefetch_abort
-
-	.align	5
-data_abort:
-	get_bad_stack
-	bad_save_user_regs
-	bl	do_data_abort
-
-	.align	5
-not_used:
-	get_bad_stack
-	bad_save_user_regs
-	bl	do_not_used
-
-#ifdef CONFIG_USE_IRQ
-
-	.align	5
-irq:
-	get_irq_stack
-	irq_save_user_regs
-	bl	do_irq
-	irq_restore_user_regs
-
-	.align	5
-fiq:
-	get_fiq_stack
-	/* someone ought to write a more effiction fiq_save_user_regs */
-	irq_save_user_regs
-	bl	do_fiq
-	irq_restore_user_regs
-
-#else
-
-	.align	5
-irq:
-	get_bad_stack
-	bad_save_user_regs
-	bl	do_irq
-
-	.align	5
-fiq:
-	get_bad_stack
-	bad_save_user_regs
-	bl	do_fiq
-
-#endif
-#endif	/* CONFIG_SPL_BUILD */