2 * linux/arch/arm/kernel/entry-armv.S
4 * Copyright (C) 1996,1997,1998 Russell King.
5 * ARM700 fix by Matthew Godbolt (linux-user@willothewisp.demon.co.uk)
6 * nommu support by Hyok S. Choi (hyok.choi@samsung.com)
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
12 * Low-level vector interface routines
14 * Note: there is a StrongARM bug in the STMIA rn, {regs}^ instruction
15 * that causes it to save wrong values... Be aware!
18 #include <asm/memory.h>
19 #include <asm/glue-df.h>
20 #include <asm/glue-pf.h>
21 #include <asm/vfpmacros.h>
22 #include <mach/entry-macro.S>
23 #include <asm/thread_notify.h>
24 #include <asm/unwind.h>
25 #include <asm/unistd.h>
28 #include "entry-header.S"
29 #include <asm/entry-macro-multi.S>
32 * Interrupt handling. Preserves r7, r8, r9
35 #ifdef CONFIG_MULTI_IRQ_HANDLER
36 ldr r5, =handle_arch_irq
43 arch_irq_handler_default
48 @ PABORT handler takes fault address in r4
52 ldr pc, [ip, #PROCESSOR_PABT_FUNC]
63 @ Call the processor-specific abort handler:
65 @ r2 - aborted context pc
66 @ r3 - aborted context cpsr
68 @ The abort handler must return the aborted address in r0, and
69 @ the fault status register in r1. r9 must be preserved.
74 ldr pc, [ip, #PROCESSOR_DABT_FUNC]
81 .section .kprobes.text,"ax",%progbits
87 * Invalid mode handlers
89 .macro inv_entry, reason
90 sub sp, sp, #S_FRAME_SIZE
91 ARM( stmib sp, {r1 - lr} )
92 THUMB( stmia sp, {r0 - r12} )
93 THUMB( str sp, [sp, #S_SP] )
94 THUMB( str lr, [sp, #S_LR] )
99 inv_entry BAD_PREFETCH
101 ENDPROC(__pabt_invalid)
106 ENDPROC(__dabt_invalid)
111 ENDPROC(__irq_invalid)
114 inv_entry BAD_UNDEFINSTR
117 @ XXX fall through to common_invalid
121 @ common_invalid - generic code for failed exception (re-entrant version of handlers)
127 add r0, sp, #S_PC @ here for interlock avoidance
128 mov r7, #-1 @ "" "" "" ""
129 str r4, [sp] @ save preserved r0
130 stmia r0, {r5 - r7} @ lr_<exception>,
131 @ cpsr_<exception>, "old_r0"
135 ENDPROC(__und_invalid)
141 #if defined(CONFIG_AEABI) && (__LINUX_ARM_ARCH__ >= 5)
142 #define SPFIX(code...) code
144 #define SPFIX(code...)
147 .macro svc_entry, stack_hole=0
149 UNWIND(.save {r0 - pc} )
150 sub sp, sp, #(S_FRAME_SIZE + \stack_hole - 4)
151 #ifdef CONFIG_THUMB2_KERNEL
152 SPFIX( str r0, [sp] ) @ temporarily saved
154 SPFIX( tst r0, #4 ) @ test original stack alignment
155 SPFIX( ldr r0, [sp] ) @ restored
159 SPFIX( subeq sp, sp, #4 )
163 add r7, sp, #S_SP - 4 @ here for interlock avoidance
164 mov r6, #-1 @ "" "" "" ""
165 add r2, sp, #(S_FRAME_SIZE + \stack_hole - 4)
166 SPFIX( addeq r2, r2, #4 )
167 str r3, [sp, #-4]! @ save the "real" r0 copied
168 @ from the exception stack
173 @ We are now ready to fill in the remaining blanks on the stack:
177 @ r4 - lr_<exception>, already fixed up for correct return/restart
178 @ r5 - spsr_<exception>
179 @ r6 - orig_r0 (see pt_regs definition in ptrace.h)
189 @ get ready to re-enable interrupts if appropriate
193 biceq r9, r9, #PSR_I_BIT
198 @ set desired IRQ state, then call main handler
206 @ IRQs off again before pulling preserved data off the stack
211 @ restore SPSR and restart the instruction
214 svc_exit r5 @ return from exception
222 #ifdef CONFIG_TRACE_IRQFLAGS
223 bl trace_hardirqs_off
228 #ifdef CONFIG_PREEMPT
230 ldr r8, [tsk, #TI_PREEMPT] @ get preempt count
231 ldr r0, [tsk, #TI_FLAGS] @ get flags
232 teq r8, #0 @ if preempt count != 0
233 movne r0, #0 @ force flags to 0
234 tst r0, #_TIF_NEED_RESCHED
238 #ifdef CONFIG_TRACE_IRQFLAGS
239 @ The parent context IRQs must have been enabled to get here in
240 @ the first place, so there's no point checking the PSR I bit.
243 svc_exit r5 @ return from exception
249 #ifdef CONFIG_PREEMPT
252 1: bl preempt_schedule_irq @ irq en/disable is done inside
253 ldr r0, [tsk, #TI_FLAGS] @ get new tasks TI_FLAGS
254 tst r0, #_TIF_NEED_RESCHED
255 moveq pc, r8 @ go again
261 #ifdef CONFIG_KPROBES
262 @ If a kprobe is about to simulate a "stmdb sp..." instruction,
263 @ it obviously needs free stack space which then will belong to
271 @ call emulation code, which returns using r9 if it has emulated
272 @ the instruction, or the more conventional lr if we are to treat
273 @ this as a real undefined instruction
277 #ifndef CONFIG_THUMB2_KERNEL
280 ldrh r0, [r4, #-2] @ Thumb instruction at LR - 2
282 cmp r9, #0xe800 @ 32-bit instruction if xx >= 0
283 ldrhhs r9, [r4] @ bottom 16 bits
284 orrhs r0, r9, r0, lsl #16
290 mov r0, sp @ struct pt_regs *regs
294 @ IRQs off again before pulling preserved data off the stack
296 1: disable_irq_notrace
299 @ restore SPSR and restart the instruction
301 ldr r5, [sp, #S_PSR] @ Get SVC cpsr
302 svc_exit r5 @ return from exception
311 @ re-enable interrupts if appropriate
315 biceq r9, r9, #PSR_I_BIT
319 msr cpsr_c, r9 @ Maybe enable interrupts
321 bl do_PrefetchAbort @ call abort handler
324 @ IRQs off again before pulling preserved data off the stack
329 @ restore SPSR and restart the instruction
332 svc_exit r5 @ return from exception
349 * EABI note: sp_svc is always 64-bit aligned here, so should S_FRAME_SIZE
352 #if defined(CONFIG_AEABI) && (__LINUX_ARM_ARCH__ >= 5) && (S_FRAME_SIZE & 7)
353 #error "sizeof(struct pt_regs) must be a multiple of 8"
358 UNWIND(.cantunwind ) @ don't unwind the user space
359 sub sp, sp, #S_FRAME_SIZE
360 ARM( stmib sp, {r1 - r12} )
361 THUMB( stmia sp, {r0 - r12} )
364 add r0, sp, #S_PC @ here for interlock avoidance
365 mov r6, #-1 @ "" "" "" ""
367 str r3, [sp] @ save the "real" r0 copied
368 @ from the exception stack
371 @ We are now ready to fill in the remaining blanks on the stack:
373 @ r4 - lr_<exception>, already fixed up for correct return/restart
374 @ r5 - spsr_<exception>
375 @ r6 - orig_r0 (see pt_regs definition in ptrace.h)
377 @ Also, separately save sp_usr and lr_usr
380 ARM( stmdb r0, {sp, lr}^ )
381 THUMB( store_user_sp_lr r0, r1, S_SP - S_PC )
384 @ Enable the alignment trap while in kernel mode
389 @ Clear FP to mark the first stack frame
394 .macro kuser_cmpxchg_check
395 #if __LINUX_ARM_ARCH__ < 6 && !defined(CONFIG_NEEDS_SYSCALL_FOR_CMPXCHG)
397 #warning "NPTL on non MMU needs fixing"
399 @ Make sure our user space atomic helper is restarted
400 @ if it was interrupted in a critical region. Here we
401 @ perform a quick test inline since it should be false
402 @ 99.9999% of the time. The rest is done out of line.
404 blhs kuser_cmpxchg_fixup
416 @ IRQs on, then call the main handler
421 adr lr, BSYM(ret_from_exception)
431 #ifdef CONFIG_IRQSOFF_TRACER
432 bl trace_hardirqs_off
438 b ret_to_user_from_irq
451 @ fall through to the emulation code, which returns using r9 if
452 @ it has emulated the instruction, or the more conventional lr
453 @ if we are to treat this as a real undefined instruction
457 adr r9, BSYM(ret_from_exception)
458 adr lr, BSYM(__und_usr_unknown)
459 tst r3, #PSR_T_BIT @ Thumb mode?
460 itet eq @ explicit IT needed for the 1f label
461 subeq r4, r2, #4 @ ARM instr at LR - 4
462 subne r4, r2, #2 @ Thumb instr at LR - 2
464 #ifdef CONFIG_CPU_ENDIAN_BE8
465 reveq r0, r0 @ little endian instruction
469 #if __LINUX_ARM_ARCH__ >= 7
471 ARM( ldrht r5, [r4], #2 )
472 THUMB( ldrht r5, [r4] )
473 THUMB( add r4, r4, #2 )
474 and r0, r5, #0xf800 @ mask bits 111x x... .... ....
475 cmp r0, #0xe800 @ 32bit instruction if xx != 0
476 blo __und_usr_unknown
478 add r2, r2, #2 @ r2 is PC + 2, make it PC + 4
479 orr r0, r0, r5, lsl #16
487 @ fallthrough to call_fpe
491 * The out of line fixup for the ldrt above.
493 .pushsection .fixup, "ax"
496 .pushsection __ex_table,"a"
498 #if __LINUX_ARM_ARCH__ >= 7
505 * Check whether the instruction is a co-processor instruction.
506 * If yes, we need to call the relevant co-processor handler.
508 * Note that we don't do a full check here for the co-processor
509 * instructions; all instructions with bit 27 set are well
510 * defined. The only instructions that should fault are the
511 * co-processor instructions. However, we have to watch out
512 * for the ARM6/ARM7 SWI bug.
514 * NEON is a special case that has to be handled here. Not all
515 * NEON instructions are co-processor instructions, so we have
516 * to make a special case of checking for them. Plus, there's
517 * five groups of them, so we have a table of mask/opcode pairs
518 * to check against, and if any match then we branch off into the
521 * Emulators may wish to make use of the following registers:
522 * r0 = instruction opcode.
524 * r9 = normal "successful" return address
525 * r10 = this threads thread_info structure.
526 * lr = unrecognised instruction return address
529 @ Fall-through from Thumb-2 __und_usr
532 adr r6, .LCneon_thumb_opcodes
537 adr r6, .LCneon_arm_opcodes
539 ldr r7, [r6], #4 @ mask value
540 cmp r7, #0 @ end mask?
543 ldr r7, [r6], #4 @ opcode bits matching in mask
544 cmp r8, r7 @ NEON instruction?
548 strb r7, [r10, #TI_USED_CP + 10] @ mark CP#10 as used
549 strb r7, [r10, #TI_USED_CP + 11] @ mark CP#11 as used
550 b do_vfp @ let VFP handler handle this
553 tst r0, #0x08000000 @ only CDP/CPRT/LDC/STC have bit 27
554 tstne r0, #0x04000000 @ bit 26 set on both ARM and Thumb-2
555 #if defined(CONFIG_CPU_ARM610) || defined(CONFIG_CPU_ARM710)
556 and r8, r0, #0x0f000000 @ mask out op-code bits
557 teqne r8, #0x0f000000 @ SWI (ARM6/7 bug)?
560 get_thread_info r10 @ get current thread
561 and r8, r0, #0x00000f00 @ mask out CP number
562 THUMB( lsr r8, r8, #8 )
564 add r6, r10, #TI_USED_CP
565 ARM( strb r7, [r6, r8, lsr #8] ) @ set appropriate used_cp[]
566 THUMB( strb r7, [r6, r8] ) @ set appropriate used_cp[]
568 @ Test if we need to give access to iWMMXt coprocessors
569 ldr r5, [r10, #TI_FLAGS]
570 rsbs r7, r8, #(1 << 8) @ CP 0 or 1 only
571 movcss r7, r5, lsr #(TIF_USING_IWMMXT + 1)
572 bcs iwmmxt_task_enable
574 ARM( add pc, pc, r8, lsr #6 )
575 THUMB( lsl r8, r8, #2 )
580 W(b) do_fpe @ CP#1 (FPE)
581 W(b) do_fpe @ CP#2 (FPE)
584 b crunch_task_enable @ CP#4 (MaverickCrunch)
585 b crunch_task_enable @ CP#5 (MaverickCrunch)
586 b crunch_task_enable @ CP#6 (MaverickCrunch)
596 W(b) do_vfp @ CP#10 (VFP)
597 W(b) do_vfp @ CP#11 (VFP)
599 movw_pc lr @ CP#10 (VFP)
600 movw_pc lr @ CP#11 (VFP)
604 movw_pc lr @ CP#14 (Debug)
605 movw_pc lr @ CP#15 (Control)
611 .word 0xfe000000 @ mask
612 .word 0xf2000000 @ opcode
614 .word 0xff100000 @ mask
615 .word 0xf4000000 @ opcode
617 .word 0x00000000 @ mask
618 .word 0x00000000 @ opcode
620 .LCneon_thumb_opcodes:
621 .word 0xef000000 @ mask
622 .word 0xef000000 @ opcode
624 .word 0xff100000 @ mask
625 .word 0xf9000000 @ opcode
627 .word 0x00000000 @ mask
628 .word 0x00000000 @ opcode
634 add r10, r10, #TI_FPSTATE @ r10 = workspace
635 ldr pc, [r4] @ Call FP module USR entry point
638 * The FP module is called with these registers set:
641 * r9 = normal "successful" return address
643 * lr = unrecognised FP instruction return address
658 adr lr, BSYM(ret_from_exception)
660 ENDPROC(__und_usr_unknown)
667 enable_irq @ Enable interrupts
669 bl do_PrefetchAbort @ call abort handler
673 * This is the return code to user mode for abort handlers
675 ENTRY(ret_from_exception)
683 ENDPROC(ret_from_exception)
686 * Register switch for ARMv3 and ARMv4 processors
687 * r0 = previous task_struct, r1 = previous thread_info, r2 = next thread_info
688 * previous and next are guaranteed not to be the same.
693 add ip, r1, #TI_CPU_SAVE
694 ldr r3, [r2, #TI_TP_VALUE]
695 ARM( stmia ip!, {r4 - sl, fp, sp, lr} ) @ Store most regs on stack
696 THUMB( stmia ip!, {r4 - sl, fp} ) @ Store most regs on stack
697 THUMB( str sp, [ip], #4 )
698 THUMB( str lr, [ip], #4 )
699 #ifdef CONFIG_CPU_USE_DOMAINS
700 ldr r6, [r2, #TI_CPU_DOMAIN]
703 #if defined(CONFIG_CC_STACKPROTECTOR) && !defined(CONFIG_SMP)
704 ldr r7, [r2, #TI_TASK]
705 ldr r8, =__stack_chk_guard
706 ldr r7, [r7, #TSK_STACK_CANARY]
708 #ifdef CONFIG_CPU_USE_DOMAINS
709 mcr p15, 0, r6, c3, c0, 0 @ Set domain register
712 add r4, r2, #TI_CPU_SAVE
713 ldr r0, =thread_notify_head
714 mov r1, #THREAD_NOTIFY_SWITCH
715 bl atomic_notifier_call_chain
716 #if defined(CONFIG_CC_STACKPROTECTOR) && !defined(CONFIG_SMP)
721 ARM( ldmia r4, {r4 - sl, fp, sp, pc} ) @ Load all regs saved previously
722 THUMB( ldmia ip!, {r4 - sl, fp} ) @ Load all regs saved previously
723 THUMB( ldr sp, [ip], #4 )
724 THUMB( ldr pc, [ip] )
733 * These are segment of kernel provided user code reachable from user space
734 * at a fixed address in kernel memory. This is used to provide user space
735 * with some operations which require kernel help because of unimplemented
736 * native feature and/or instructions in many ARM CPUs. The idea is for
737 * this code to be executed directly in user mode for best efficiency but
738 * which is too intimate with the kernel counter part to be left to user
739 * libraries. In fact this code might even differ from one CPU to another
740 * depending on the available instruction set and restrictions like on
741 * SMP systems. In other words, the kernel reserves the right to change
742 * this code as needed without warning. Only the entry points and their
743 * results are guaranteed to be stable.
745 * Each segment is 32-byte aligned and will be moved to the top of the high
746 * vector page. New segments (if ever needed) must be added in front of
747 * existing ones. This mechanism should be used only for things that are
748 * really small and justified, and not be abused freely.
750 * User space is expected to implement those things inline when optimizing
751 * for a processor that has the necessary native support, but only if such
752 * resulting binaries are already to be incompatible with earlier ARM
753 * processors due to the use of unsupported instructions other than what
754 * is provided here. In other words don't make binaries unable to run on
755 * earlier processors just for the sake of not using these kernel helpers
756 * if your compiled code is not going to use the new instructions for other
762 #ifdef CONFIG_ARM_THUMB
770 .globl __kuser_helper_start
771 __kuser_helper_start:
774 * Reference prototype:
776 * void __kernel_memory_barrier(void)
780 * lr = return address
790 * Definition and user space usage example:
792 * typedef void (__kernel_dmb_t)(void);
793 * #define __kernel_dmb (*(__kernel_dmb_t *)0xffff0fa0)
795 * Apply any needed memory barrier to preserve consistency with data modified
796 * manually and __kuser_cmpxchg usage.
798 * This could be used as follows:
800 * #define __kernel_dmb() \
801 * asm volatile ( "mov r0, #0xffff0fff; mov lr, pc; sub pc, r0, #95" \
802 * : : : "r0", "lr","cc" )
805 __kuser_memory_barrier: @ 0xffff0fa0
812 * Reference prototype:
814 * int __kernel_cmpxchg(int oldval, int newval, int *ptr)
821 * lr = return address
825 * r0 = returned value (zero or non-zero)
826 * C flag = set if r0 == 0, clear if r0 != 0
832 * Definition and user space usage example:
834 * typedef int (__kernel_cmpxchg_t)(int oldval, int newval, int *ptr);
835 * #define __kernel_cmpxchg (*(__kernel_cmpxchg_t *)0xffff0fc0)
837 * Atomically store newval in *ptr if *ptr is equal to oldval for user space.
838 * Return zero if *ptr was changed or non-zero if no exchange happened.
839 * The C flag is also set if *ptr was changed to allow for assembly
840 * optimization in the calling code.
844 * - This routine already includes memory barriers as needed.
846 * For example, a user space atomic_add implementation could look like this:
848 * #define atomic_add(ptr, val) \
849 * ({ register unsigned int *__ptr asm("r2") = (ptr); \
850 * register unsigned int __result asm("r1"); \
852 * "1: @ atomic_add\n\t" \
853 * "ldr r0, [r2]\n\t" \
854 * "mov r3, #0xffff0fff\n\t" \
855 * "add lr, pc, #4\n\t" \
856 * "add r1, r0, %2\n\t" \
857 * "add pc, r3, #(0xffff0fc0 - 0xffff0fff)\n\t" \
859 * : "=&r" (__result) \
860 * : "r" (__ptr), "rIL" (val) \
861 * : "r0","r3","ip","lr","cc","memory" ); \
865 __kuser_cmpxchg: @ 0xffff0fc0
867 #if defined(CONFIG_NEEDS_SYSCALL_FOR_CMPXCHG)
870 * Poor you. No fast solution possible...
871 * The kernel itself must perform the operation.
872 * A special ghost syscall is used for that (see traps.c).
875 ldr r7, 1f @ it's 20 bits
878 1: .word __ARM_NR_cmpxchg
880 #elif __LINUX_ARM_ARCH__ < 6
885 * The only thing that can break atomicity in this cmpxchg
886 * implementation is either an IRQ or a data abort exception
887 * causing another process/thread to be scheduled in the middle
888 * of the critical sequence. To prevent this, code is added to
889 * the IRQ and data abort exception handlers to set the pc back
890 * to the beginning of the critical section if it is found to be
891 * within that critical section (see kuser_cmpxchg_fixup).
893 1: ldr r3, [r2] @ load current val
894 subs r3, r3, r0 @ compare with oldval
895 2: streq r1, [r2] @ store newval if eq
896 rsbs r0, r3, #0 @ set return val and C flag
901 @ Called from kuser_cmpxchg_check macro.
902 @ r4 = address of interrupted insn (must be preserved).
903 @ sp = saved regs. r7 and r8 are clobbered.
904 @ 1b = first critical insn, 2b = last critical insn.
905 @ If r4 >= 1b and r4 <= 2b then saved pc_usr is set to 1b.
907 sub r7, r7, #(0xffff0fff - (0xffff0fc0 + (1b - __kuser_cmpxchg)))
909 rsbcss r8, r8, #(2b - 1b)
910 strcs r7, [sp, #S_PC]
915 #warning "NPTL on non MMU needs fixing"
930 /* beware -- each __kuser slot must be 8 instructions max */
931 ALT_SMP(b __kuser_memory_barrier)
939 * Reference prototype:
941 * int __kernel_get_tls(void)
945 * lr = return address
955 * Definition and user space usage example:
957 * typedef int (__kernel_get_tls_t)(void);
958 * #define __kernel_get_tls (*(__kernel_get_tls_t *)0xffff0fe0)
960 * Get the TLS value as previously set via the __ARM_NR_set_tls syscall.
962 * This could be used as follows:
964 * #define __kernel_get_tls() \
965 * ({ register unsigned int __val asm("r0"); \
966 * asm( "mov r0, #0xffff0fff; mov lr, pc; sub pc, r0, #31" \
967 * : "=r" (__val) : : "lr","cc" ); \
971 __kuser_get_tls: @ 0xffff0fe0
972 ldr r0, [pc, #(16 - 8)] @ read TLS, set in kuser_get_tls_init
974 mrc p15, 0, r0, c13, c0, 3 @ 0xffff0fe8 hardware TLS code
976 .word 0 @ 0xffff0ff0 software TLS value, then
977 .endr @ pad up to __kuser_helper_version
980 * Reference declaration:
982 * extern unsigned int __kernel_helper_version;
984 * Definition and user space usage example:
986 * #define __kernel_helper_version (*(unsigned int *)0xffff0ffc)
988 * User space may read this to determine the curent number of helpers
992 __kuser_helper_version: @ 0xffff0ffc
993 .word ((__kuser_helper_end - __kuser_helper_start) >> 5)
995 .globl __kuser_helper_end
1003 * This code is copied to 0xffff0200 so we can use branches in the
1004 * vectors, rather than ldr's. Note that this code must not
1005 * exceed 0x300 bytes.
1007 * Common stub entry macro:
1008 * Enter in IRQ mode, spsr = SVC/USR CPSR, lr = SVC/USR PC
1010 * SP points to a minimal amount of processor-private memory, the address
1011 * of which is copied into r0 for the mode specific abort handler.
1013 .macro vector_stub, name, mode, correction=0
1018 sub lr, lr, #\correction
1022 @ Save r0, lr_<exception> (parent PC) and spsr_<exception>
1025 stmia sp, {r0, lr} @ save r0, lr
1027 str lr, [sp, #8] @ save spsr
1030 @ Prepare for SVC32 mode. IRQs remain disabled.
1033 eor r0, r0, #(\mode ^ SVC_MODE | PSR_ISETSTATE)
1037 @ the branch table must immediately follow this code
1041 THUMB( ldr lr, [r0, lr, lsl #2] )
1043 ARM( ldr lr, [pc, lr, lsl #2] )
1044 movs pc, lr @ branch to handler in SVC mode
1045 ENDPROC(vector_\name)
1048 @ handler addresses follow this label
1052 .globl __stubs_start
1055 * Interrupt dispatcher
1057 vector_stub irq, IRQ_MODE, 4
1059 .long __irq_usr @ 0 (USR_26 / USR_32)
1060 .long __irq_invalid @ 1 (FIQ_26 / FIQ_32)
1061 .long __irq_invalid @ 2 (IRQ_26 / IRQ_32)
1062 .long __irq_svc @ 3 (SVC_26 / SVC_32)
1063 .long __irq_invalid @ 4
1064 .long __irq_invalid @ 5
1065 .long __irq_invalid @ 6
1066 .long __irq_invalid @ 7
1067 .long __irq_invalid @ 8
1068 .long __irq_invalid @ 9
1069 .long __irq_invalid @ a
1070 .long __irq_invalid @ b
1071 .long __irq_invalid @ c
1072 .long __irq_invalid @ d
1073 .long __irq_invalid @ e
1074 .long __irq_invalid @ f
1077 * Data abort dispatcher
1078 * Enter in ABT mode, spsr = USR CPSR, lr = USR PC
1080 vector_stub dabt, ABT_MODE, 8
1082 .long __dabt_usr @ 0 (USR_26 / USR_32)
1083 .long __dabt_invalid @ 1 (FIQ_26 / FIQ_32)
1084 .long __dabt_invalid @ 2 (IRQ_26 / IRQ_32)
1085 .long __dabt_svc @ 3 (SVC_26 / SVC_32)
1086 .long __dabt_invalid @ 4
1087 .long __dabt_invalid @ 5
1088 .long __dabt_invalid @ 6
1089 .long __dabt_invalid @ 7
1090 .long __dabt_invalid @ 8
1091 .long __dabt_invalid @ 9
1092 .long __dabt_invalid @ a
1093 .long __dabt_invalid @ b
1094 .long __dabt_invalid @ c
1095 .long __dabt_invalid @ d
1096 .long __dabt_invalid @ e
1097 .long __dabt_invalid @ f
1100 * Prefetch abort dispatcher
1101 * Enter in ABT mode, spsr = USR CPSR, lr = USR PC
1103 vector_stub pabt, ABT_MODE, 4
1105 .long __pabt_usr @ 0 (USR_26 / USR_32)
1106 .long __pabt_invalid @ 1 (FIQ_26 / FIQ_32)
1107 .long __pabt_invalid @ 2 (IRQ_26 / IRQ_32)
1108 .long __pabt_svc @ 3 (SVC_26 / SVC_32)
1109 .long __pabt_invalid @ 4
1110 .long __pabt_invalid @ 5
1111 .long __pabt_invalid @ 6
1112 .long __pabt_invalid @ 7
1113 .long __pabt_invalid @ 8
1114 .long __pabt_invalid @ 9
1115 .long __pabt_invalid @ a
1116 .long __pabt_invalid @ b
1117 .long __pabt_invalid @ c
1118 .long __pabt_invalid @ d
1119 .long __pabt_invalid @ e
1120 .long __pabt_invalid @ f
1123 * Undef instr entry dispatcher
1124 * Enter in UND mode, spsr = SVC/USR CPSR, lr = SVC/USR PC
1126 vector_stub und, UND_MODE
1128 .long __und_usr @ 0 (USR_26 / USR_32)
1129 .long __und_invalid @ 1 (FIQ_26 / FIQ_32)
1130 .long __und_invalid @ 2 (IRQ_26 / IRQ_32)
1131 .long __und_svc @ 3 (SVC_26 / SVC_32)
1132 .long __und_invalid @ 4
1133 .long __und_invalid @ 5
1134 .long __und_invalid @ 6
1135 .long __und_invalid @ 7
1136 .long __und_invalid @ 8
1137 .long __und_invalid @ 9
1138 .long __und_invalid @ a
1139 .long __und_invalid @ b
1140 .long __und_invalid @ c
1141 .long __und_invalid @ d
1142 .long __und_invalid @ e
1143 .long __und_invalid @ f
1147 /*=============================================================================
1149 *-----------------------------------------------------------------------------
1150 * Enter in FIQ mode, spsr = ANY CPSR, lr = ANY PC
1151 * MUST PRESERVE SVC SPSR, but need to switch to SVC mode to show our msg.
1152 * Basically to switch modes, we *HAVE* to clobber one register... brain
1153 * damage alert! I don't think that we can execute any code in here in any
1154 * other mode than FIQ... Ok you can switch to another mode, but you can't
1155 * get out of that mode without clobbering one register.
1161 /*=============================================================================
1162 * Address exception handler
1163 *-----------------------------------------------------------------------------
1164 * These aren't too critical.
1165 * (they're not supposed to happen, and won't happen in 32-bit data mode).
1172 * We group all the following data together to optimise
1173 * for CPUs with separate I & D caches.
1183 .equ stubs_offset, __vectors_start + 0x200 - __stubs_start
1185 .globl __vectors_start
1187 ARM( swi SYS_ERROR0 )
1190 W(b) vector_und + stubs_offset
1191 W(ldr) pc, .LCvswi + stubs_offset
1192 W(b) vector_pabt + stubs_offset
1193 W(b) vector_dabt + stubs_offset
1194 W(b) vector_addrexcptn + stubs_offset
1195 W(b) vector_irq + stubs_offset
1196 W(b) vector_fiq + stubs_offset
1198 .globl __vectors_end
1204 .globl cr_no_alignment
1210 #ifdef CONFIG_MULTI_IRQ_HANDLER
1211 .globl handle_arch_irq