diff options
Diffstat (limited to 'arch/arm/cpu/arm1136/start.S')
| -rw-r--r-- | arch/arm/cpu/arm1136/start.S | 254 |
1 files changed, 1 insertions, 253 deletions
diff --git a/arch/arm/cpu/arm1136/start.S b/arch/arm/cpu/arm1136/start.S index 3e2358e132b..1cfcca9fa6d 100644 --- a/arch/arm/cpu/arm1136/start.S +++ b/arch/arm/cpu/arm1136/start.S @@ -15,48 +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 */ -.global _end_vect -_end_vect: - - .balignl 16,0xdeadbeef /* ************************************************************************* * @@ -70,26 +29,7 @@ _end_vect: ************************************************************************* */ -#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: /* @@ -152,195 +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 - .align 5 -.global arm1136_cache_flush -arm1136_cache_flush: -#if !defined(CONFIG_SYS_ICACHE_OFF) - mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache -#endif -#if !defined(CONFIG_SYS_DCACHE_OFF) - mcr p15, 0, r1, c7, c14, 0 @ invalidate D cache -#endif - mov pc, lr @ back to caller -#endif /* CONFIG_SPL_BUILD */ |