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)
188 #ifdef CONFIG_TRACE_IRQFLAGS
189 bl trace_hardirqs_off
201 @ IRQs off again before pulling preserved data off the stack
206 @ restore SPSR and restart the instruction
209 #ifdef CONFIG_TRACE_IRQFLAGS
211 bleq trace_hardirqs_on
213 blne trace_hardirqs_off
215 svc_exit r5 @ return from exception
223 #ifdef CONFIG_TRACE_IRQFLAGS
224 bl trace_hardirqs_off
229 #ifdef CONFIG_PREEMPT
231 ldr r8, [tsk, #TI_PREEMPT] @ get preempt count
232 ldr r0, [tsk, #TI_FLAGS] @ get flags
233 teq r8, #0 @ if preempt count != 0
234 movne r0, #0 @ force flags to 0
235 tst r0, #_TIF_NEED_RESCHED
239 #ifdef CONFIG_TRACE_IRQFLAGS
240 @ The parent context IRQs must have been enabled to get here in
241 @ the first place, so there's no point checking the PSR I bit.
244 svc_exit r5 @ return from exception
250 #ifdef CONFIG_PREEMPT
253 1: bl preempt_schedule_irq @ irq en/disable is done inside
254 ldr r0, [tsk, #TI_FLAGS] @ get new tasks TI_FLAGS
255 tst r0, #_TIF_NEED_RESCHED
256 moveq pc, r8 @ go again
262 #ifdef CONFIG_KPROBES
263 @ If a kprobe is about to simulate a "stmdb sp..." instruction,
264 @ it obviously needs free stack space which then will belong to
272 @ call emulation code, which returns using r9 if it has emulated
273 @ the instruction, or the more conventional lr if we are to treat
274 @ this as a real undefined instruction
278 #ifndef CONFIG_THUMB2_KERNEL
281 ldrh r0, [r4, #-2] @ Thumb instruction at LR - 2
283 cmp r9, #0xe800 @ 32-bit instruction if xx >= 0
284 ldrhhs r9, [r4] @ bottom 16 bits
285 orrhs r0, r9, r0, lsl #16
291 mov r0, sp @ struct pt_regs *regs
295 @ IRQs off again before pulling preserved data off the stack
297 1: disable_irq_notrace
300 @ restore SPSR and restart the instruction
302 ldr r5, [sp, #S_PSR] @ Get SVC cpsr
303 svc_exit r5 @ return from exception
311 #ifdef CONFIG_TRACE_IRQFLAGS
312 bl trace_hardirqs_off
317 bl do_PrefetchAbort @ call abort handler
320 @ IRQs off again before pulling preserved data off the stack
325 @ restore SPSR and restart the instruction
328 #ifdef CONFIG_TRACE_IRQFLAGS
330 bleq trace_hardirqs_on
332 blne trace_hardirqs_off
334 svc_exit r5 @ return from exception
351 * EABI note: sp_svc is always 64-bit aligned here, so should S_FRAME_SIZE
354 #if defined(CONFIG_AEABI) && (__LINUX_ARM_ARCH__ >= 5) && (S_FRAME_SIZE & 7)
355 #error "sizeof(struct pt_regs) must be a multiple of 8"
360 UNWIND(.cantunwind ) @ don't unwind the user space
361 sub sp, sp, #S_FRAME_SIZE
362 ARM( stmib sp, {r1 - r12} )
363 THUMB( stmia sp, {r0 - r12} )
366 add r0, sp, #S_PC @ here for interlock avoidance
367 mov r6, #-1 @ "" "" "" ""
369 str r3, [sp] @ save the "real" r0 copied
370 @ from the exception stack
373 @ We are now ready to fill in the remaining blanks on the stack:
375 @ r4 - lr_<exception>, already fixed up for correct return/restart
376 @ r5 - spsr_<exception>
377 @ r6 - orig_r0 (see pt_regs definition in ptrace.h)
379 @ Also, separately save sp_usr and lr_usr
382 ARM( stmdb r0, {sp, lr}^ )
383 THUMB( store_user_sp_lr r0, r1, S_SP - S_PC )
386 @ Enable the alignment trap while in kernel mode
391 @ Clear FP to mark the first stack frame
396 .macro kuser_cmpxchg_check
397 #if __LINUX_ARM_ARCH__ < 6 && !defined(CONFIG_NEEDS_SYSCALL_FOR_CMPXCHG)
399 #warning "NPTL on non MMU needs fixing"
401 @ Make sure our user space atomic helper is restarted
402 @ if it was interrupted in a critical region. Here we
403 @ perform a quick test inline since it should be false
404 @ 99.9999% of the time. The rest is done out of line.
406 blhs kuser_cmpxchg_fixup
418 adr lr, BSYM(ret_from_exception)
428 #ifdef CONFIG_IRQSOFF_TRACER
429 bl trace_hardirqs_off
435 b ret_to_user_from_irq
448 @ fall through to the emulation code, which returns using r9 if
449 @ it has emulated the instruction, or the more conventional lr
450 @ if we are to treat this as a real undefined instruction
454 adr r9, BSYM(ret_from_exception)
455 adr lr, BSYM(__und_usr_unknown)
456 tst r3, #PSR_T_BIT @ Thumb mode?
457 itet eq @ explicit IT needed for the 1f label
458 subeq r4, r2, #4 @ ARM instr at LR - 4
459 subne r4, r2, #2 @ Thumb instr at LR - 2
461 #ifdef CONFIG_CPU_ENDIAN_BE8
462 reveq r0, r0 @ little endian instruction
466 #if __LINUX_ARM_ARCH__ >= 7
468 ARM( ldrht r5, [r4], #2 )
469 THUMB( ldrht r5, [r4] )
470 THUMB( add r4, r4, #2 )
471 and r0, r5, #0xf800 @ mask bits 111x x... .... ....
472 cmp r0, #0xe800 @ 32bit instruction if xx != 0
473 blo __und_usr_unknown
475 add r2, r2, #2 @ r2 is PC + 2, make it PC + 4
476 orr r0, r0, r5, lsl #16
484 @ fallthrough to call_fpe
488 * The out of line fixup for the ldrt above.
490 .pushsection .fixup, "ax"
493 .pushsection __ex_table,"a"
495 #if __LINUX_ARM_ARCH__ >= 7
502 * Check whether the instruction is a co-processor instruction.
503 * If yes, we need to call the relevant co-processor handler.
505 * Note that we don't do a full check here for the co-processor
506 * instructions; all instructions with bit 27 set are well
507 * defined. The only instructions that should fault are the
508 * co-processor instructions. However, we have to watch out
509 * for the ARM6/ARM7 SWI bug.
511 * NEON is a special case that has to be handled here. Not all
512 * NEON instructions are co-processor instructions, so we have
513 * to make a special case of checking for them. Plus, there's
514 * five groups of them, so we have a table of mask/opcode pairs
515 * to check against, and if any match then we branch off into the
518 * Emulators may wish to make use of the following registers:
519 * r0 = instruction opcode.
521 * r9 = normal "successful" return address
522 * r10 = this threads thread_info structure.
523 * lr = unrecognised instruction return address
526 @ Fall-through from Thumb-2 __und_usr
529 adr r6, .LCneon_thumb_opcodes
534 adr r6, .LCneon_arm_opcodes
536 ldr r7, [r6], #4 @ mask value
537 cmp r7, #0 @ end mask?
540 ldr r7, [r6], #4 @ opcode bits matching in mask
541 cmp r8, r7 @ NEON instruction?
545 strb r7, [r10, #TI_USED_CP + 10] @ mark CP#10 as used
546 strb r7, [r10, #TI_USED_CP + 11] @ mark CP#11 as used
547 b do_vfp @ let VFP handler handle this
550 tst r0, #0x08000000 @ only CDP/CPRT/LDC/STC have bit 27
551 tstne r0, #0x04000000 @ bit 26 set on both ARM and Thumb-2
552 #if defined(CONFIG_CPU_ARM610) || defined(CONFIG_CPU_ARM710)
553 and r8, r0, #0x0f000000 @ mask out op-code bits
554 teqne r8, #0x0f000000 @ SWI (ARM6/7 bug)?
557 get_thread_info r10 @ get current thread
558 and r8, r0, #0x00000f00 @ mask out CP number
559 THUMB( lsr r8, r8, #8 )
561 add r6, r10, #TI_USED_CP
562 ARM( strb r7, [r6, r8, lsr #8] ) @ set appropriate used_cp[]
563 THUMB( strb r7, [r6, r8] ) @ set appropriate used_cp[]
565 @ Test if we need to give access to iWMMXt coprocessors
566 ldr r5, [r10, #TI_FLAGS]
567 rsbs r7, r8, #(1 << 8) @ CP 0 or 1 only
568 movcss r7, r5, lsr #(TIF_USING_IWMMXT + 1)
569 bcs iwmmxt_task_enable
571 ARM( add pc, pc, r8, lsr #6 )
572 THUMB( lsl r8, r8, #2 )
577 W(b) do_fpe @ CP#1 (FPE)
578 W(b) do_fpe @ CP#2 (FPE)
581 b crunch_task_enable @ CP#4 (MaverickCrunch)
582 b crunch_task_enable @ CP#5 (MaverickCrunch)
583 b crunch_task_enable @ CP#6 (MaverickCrunch)
593 W(b) do_vfp @ CP#10 (VFP)
594 W(b) do_vfp @ CP#11 (VFP)
596 movw_pc lr @ CP#10 (VFP)
597 movw_pc lr @ CP#11 (VFP)
601 movw_pc lr @ CP#14 (Debug)
602 movw_pc lr @ CP#15 (Control)
608 .word 0xfe000000 @ mask
609 .word 0xf2000000 @ opcode
611 .word 0xff100000 @ mask
612 .word 0xf4000000 @ opcode
614 .word 0x00000000 @ mask
615 .word 0x00000000 @ opcode
617 .LCneon_thumb_opcodes:
618 .word 0xef000000 @ mask
619 .word 0xef000000 @ opcode
621 .word 0xff100000 @ mask
622 .word 0xf9000000 @ opcode
624 .word 0x00000000 @ mask
625 .word 0x00000000 @ opcode
631 add r10, r10, #TI_FPSTATE @ r10 = workspace
632 ldr pc, [r4] @ Call FP module USR entry point
635 * The FP module is called with these registers set:
638 * r9 = normal "successful" return address
640 * lr = unrecognised FP instruction return address
655 adr lr, BSYM(ret_from_exception)
657 ENDPROC(__und_usr_unknown)
664 bl do_PrefetchAbort @ call abort handler
668 * This is the return code to user mode for abort handlers
670 ENTRY(ret_from_exception)
678 ENDPROC(ret_from_exception)
681 * Register switch for ARMv3 and ARMv4 processors
682 * r0 = previous task_struct, r1 = previous thread_info, r2 = next thread_info
683 * previous and next are guaranteed not to be the same.
688 add ip, r1, #TI_CPU_SAVE
689 ldr r3, [r2, #TI_TP_VALUE]
690 ARM( stmia ip!, {r4 - sl, fp, sp, lr} ) @ Store most regs on stack
691 THUMB( stmia ip!, {r4 - sl, fp} ) @ Store most regs on stack
692 THUMB( str sp, [ip], #4 )
693 THUMB( str lr, [ip], #4 )
694 #ifdef CONFIG_CPU_USE_DOMAINS
695 ldr r6, [r2, #TI_CPU_DOMAIN]
698 #if defined(CONFIG_CC_STACKPROTECTOR) && !defined(CONFIG_SMP)
699 ldr r7, [r2, #TI_TASK]
700 ldr r8, =__stack_chk_guard
701 ldr r7, [r7, #TSK_STACK_CANARY]
703 #ifdef CONFIG_CPU_USE_DOMAINS
704 mcr p15, 0, r6, c3, c0, 0 @ Set domain register
707 add r4, r2, #TI_CPU_SAVE
708 ldr r0, =thread_notify_head
709 mov r1, #THREAD_NOTIFY_SWITCH
710 bl atomic_notifier_call_chain
711 #if defined(CONFIG_CC_STACKPROTECTOR) && !defined(CONFIG_SMP)
716 ARM( ldmia r4, {r4 - sl, fp, sp, pc} ) @ Load all regs saved previously
717 THUMB( ldmia ip!, {r4 - sl, fp} ) @ Load all regs saved previously
718 THUMB( ldr sp, [ip], #4 )
719 THUMB( ldr pc, [ip] )
728 * These are segment of kernel provided user code reachable from user space
729 * at a fixed address in kernel memory. This is used to provide user space
730 * with some operations which require kernel help because of unimplemented
731 * native feature and/or instructions in many ARM CPUs. The idea is for
732 * this code to be executed directly in user mode for best efficiency but
733 * which is too intimate with the kernel counter part to be left to user
734 * libraries. In fact this code might even differ from one CPU to another
735 * depending on the available instruction set and restrictions like on
736 * SMP systems. In other words, the kernel reserves the right to change
737 * this code as needed without warning. Only the entry points and their
738 * results are guaranteed to be stable.
740 * Each segment is 32-byte aligned and will be moved to the top of the high
741 * vector page. New segments (if ever needed) must be added in front of
742 * existing ones. This mechanism should be used only for things that are
743 * really small and justified, and not be abused freely.
745 * User space is expected to implement those things inline when optimizing
746 * for a processor that has the necessary native support, but only if such
747 * resulting binaries are already to be incompatible with earlier ARM
748 * processors due to the use of unsupported instructions other than what
749 * is provided here. In other words don't make binaries unable to run on
750 * earlier processors just for the sake of not using these kernel helpers
751 * if your compiled code is not going to use the new instructions for other
757 #ifdef CONFIG_ARM_THUMB
765 .globl __kuser_helper_start
766 __kuser_helper_start:
769 * Reference prototype:
771 * void __kernel_memory_barrier(void)
775 * lr = return address
785 * Definition and user space usage example:
787 * typedef void (__kernel_dmb_t)(void);
788 * #define __kernel_dmb (*(__kernel_dmb_t *)0xffff0fa0)
790 * Apply any needed memory barrier to preserve consistency with data modified
791 * manually and __kuser_cmpxchg usage.
793 * This could be used as follows:
795 * #define __kernel_dmb() \
796 * asm volatile ( "mov r0, #0xffff0fff; mov lr, pc; sub pc, r0, #95" \
797 * : : : "r0", "lr","cc" )
800 __kuser_memory_barrier: @ 0xffff0fa0
807 * Reference prototype:
809 * int __kernel_cmpxchg(int oldval, int newval, int *ptr)
816 * lr = return address
820 * r0 = returned value (zero or non-zero)
821 * C flag = set if r0 == 0, clear if r0 != 0
827 * Definition and user space usage example:
829 * typedef int (__kernel_cmpxchg_t)(int oldval, int newval, int *ptr);
830 * #define __kernel_cmpxchg (*(__kernel_cmpxchg_t *)0xffff0fc0)
832 * Atomically store newval in *ptr if *ptr is equal to oldval for user space.
833 * Return zero if *ptr was changed or non-zero if no exchange happened.
834 * The C flag is also set if *ptr was changed to allow for assembly
835 * optimization in the calling code.
839 * - This routine already includes memory barriers as needed.
841 * For example, a user space atomic_add implementation could look like this:
843 * #define atomic_add(ptr, val) \
844 * ({ register unsigned int *__ptr asm("r2") = (ptr); \
845 * register unsigned int __result asm("r1"); \
847 * "1: @ atomic_add\n\t" \
848 * "ldr r0, [r2]\n\t" \
849 * "mov r3, #0xffff0fff\n\t" \
850 * "add lr, pc, #4\n\t" \
851 * "add r1, r0, %2\n\t" \
852 * "add pc, r3, #(0xffff0fc0 - 0xffff0fff)\n\t" \
854 * : "=&r" (__result) \
855 * : "r" (__ptr), "rIL" (val) \
856 * : "r0","r3","ip","lr","cc","memory" ); \
860 __kuser_cmpxchg: @ 0xffff0fc0
862 #if defined(CONFIG_NEEDS_SYSCALL_FOR_CMPXCHG)
865 * Poor you. No fast solution possible...
866 * The kernel itself must perform the operation.
867 * A special ghost syscall is used for that (see traps.c).
870 ldr r7, 1f @ it's 20 bits
873 1: .word __ARM_NR_cmpxchg
875 #elif __LINUX_ARM_ARCH__ < 6
880 * The only thing that can break atomicity in this cmpxchg
881 * implementation is either an IRQ or a data abort exception
882 * causing another process/thread to be scheduled in the middle
883 * of the critical sequence. To prevent this, code is added to
884 * the IRQ and data abort exception handlers to set the pc back
885 * to the beginning of the critical section if it is found to be
886 * within that critical section (see kuser_cmpxchg_fixup).
888 1: ldr r3, [r2] @ load current val
889 subs r3, r3, r0 @ compare with oldval
890 2: streq r1, [r2] @ store newval if eq
891 rsbs r0, r3, #0 @ set return val and C flag
896 @ Called from kuser_cmpxchg_check macro.
897 @ r4 = address of interrupted insn (must be preserved).
898 @ sp = saved regs. r7 and r8 are clobbered.
899 @ 1b = first critical insn, 2b = last critical insn.
900 @ If r4 >= 1b and r4 <= 2b then saved pc_usr is set to 1b.
902 sub r7, r7, #(0xffff0fff - (0xffff0fc0 + (1b - __kuser_cmpxchg)))
904 rsbcss r8, r8, #(2b - 1b)
905 strcs r7, [sp, #S_PC]
910 #warning "NPTL on non MMU needs fixing"
925 /* beware -- each __kuser slot must be 8 instructions max */
926 ALT_SMP(b __kuser_memory_barrier)
934 * Reference prototype:
936 * int __kernel_get_tls(void)
940 * lr = return address
950 * Definition and user space usage example:
952 * typedef int (__kernel_get_tls_t)(void);
953 * #define __kernel_get_tls (*(__kernel_get_tls_t *)0xffff0fe0)
955 * Get the TLS value as previously set via the __ARM_NR_set_tls syscall.
957 * This could be used as follows:
959 * #define __kernel_get_tls() \
960 * ({ register unsigned int __val asm("r0"); \
961 * asm( "mov r0, #0xffff0fff; mov lr, pc; sub pc, r0, #31" \
962 * : "=r" (__val) : : "lr","cc" ); \
966 __kuser_get_tls: @ 0xffff0fe0
967 ldr r0, [pc, #(16 - 8)] @ read TLS, set in kuser_get_tls_init
969 mrc p15, 0, r0, c13, c0, 3 @ 0xffff0fe8 hardware TLS code
971 .word 0 @ 0xffff0ff0 software TLS value, then
972 .endr @ pad up to __kuser_helper_version
975 * Reference declaration:
977 * extern unsigned int __kernel_helper_version;
979 * Definition and user space usage example:
981 * #define __kernel_helper_version (*(unsigned int *)0xffff0ffc)
983 * User space may read this to determine the curent number of helpers
987 __kuser_helper_version: @ 0xffff0ffc
988 .word ((__kuser_helper_end - __kuser_helper_start) >> 5)
990 .globl __kuser_helper_end
998 * This code is copied to 0xffff0200 so we can use branches in the
999 * vectors, rather than ldr's. Note that this code must not
1000 * exceed 0x300 bytes.
1002 * Common stub entry macro:
1003 * Enter in IRQ mode, spsr = SVC/USR CPSR, lr = SVC/USR PC
1005 * SP points to a minimal amount of processor-private memory, the address
1006 * of which is copied into r0 for the mode specific abort handler.
1008 .macro vector_stub, name, mode, correction=0
1013 sub lr, lr, #\correction
1017 @ Save r0, lr_<exception> (parent PC) and spsr_<exception>
1020 stmia sp, {r0, lr} @ save r0, lr
1022 str lr, [sp, #8] @ save spsr
1025 @ Prepare for SVC32 mode. IRQs remain disabled.
1028 eor r0, r0, #(\mode ^ SVC_MODE | PSR_ISETSTATE)
1032 @ the branch table must immediately follow this code
1036 THUMB( ldr lr, [r0, lr, lsl #2] )
1038 ARM( ldr lr, [pc, lr, lsl #2] )
1039 movs pc, lr @ branch to handler in SVC mode
1040 ENDPROC(vector_\name)
1043 @ handler addresses follow this label
1047 .globl __stubs_start
1050 * Interrupt dispatcher
1052 vector_stub irq, IRQ_MODE, 4
1054 .long __irq_usr @ 0 (USR_26 / USR_32)
1055 .long __irq_invalid @ 1 (FIQ_26 / FIQ_32)
1056 .long __irq_invalid @ 2 (IRQ_26 / IRQ_32)
1057 .long __irq_svc @ 3 (SVC_26 / SVC_32)
1058 .long __irq_invalid @ 4
1059 .long __irq_invalid @ 5
1060 .long __irq_invalid @ 6
1061 .long __irq_invalid @ 7
1062 .long __irq_invalid @ 8
1063 .long __irq_invalid @ 9
1064 .long __irq_invalid @ a
1065 .long __irq_invalid @ b
1066 .long __irq_invalid @ c
1067 .long __irq_invalid @ d
1068 .long __irq_invalid @ e
1069 .long __irq_invalid @ f
1072 * Data abort dispatcher
1073 * Enter in ABT mode, spsr = USR CPSR, lr = USR PC
1075 vector_stub dabt, ABT_MODE, 8
1077 .long __dabt_usr @ 0 (USR_26 / USR_32)
1078 .long __dabt_invalid @ 1 (FIQ_26 / FIQ_32)
1079 .long __dabt_invalid @ 2 (IRQ_26 / IRQ_32)
1080 .long __dabt_svc @ 3 (SVC_26 / SVC_32)
1081 .long __dabt_invalid @ 4
1082 .long __dabt_invalid @ 5
1083 .long __dabt_invalid @ 6
1084 .long __dabt_invalid @ 7
1085 .long __dabt_invalid @ 8
1086 .long __dabt_invalid @ 9
1087 .long __dabt_invalid @ a
1088 .long __dabt_invalid @ b
1089 .long __dabt_invalid @ c
1090 .long __dabt_invalid @ d
1091 .long __dabt_invalid @ e
1092 .long __dabt_invalid @ f
1095 * Prefetch abort dispatcher
1096 * Enter in ABT mode, spsr = USR CPSR, lr = USR PC
1098 vector_stub pabt, ABT_MODE, 4
1100 .long __pabt_usr @ 0 (USR_26 / USR_32)
1101 .long __pabt_invalid @ 1 (FIQ_26 / FIQ_32)
1102 .long __pabt_invalid @ 2 (IRQ_26 / IRQ_32)
1103 .long __pabt_svc @ 3 (SVC_26 / SVC_32)
1104 .long __pabt_invalid @ 4
1105 .long __pabt_invalid @ 5
1106 .long __pabt_invalid @ 6
1107 .long __pabt_invalid @ 7
1108 .long __pabt_invalid @ 8
1109 .long __pabt_invalid @ 9
1110 .long __pabt_invalid @ a
1111 .long __pabt_invalid @ b
1112 .long __pabt_invalid @ c
1113 .long __pabt_invalid @ d
1114 .long __pabt_invalid @ e
1115 .long __pabt_invalid @ f
1118 * Undef instr entry dispatcher
1119 * Enter in UND mode, spsr = SVC/USR CPSR, lr = SVC/USR PC
1121 vector_stub und, UND_MODE
1123 .long __und_usr @ 0 (USR_26 / USR_32)
1124 .long __und_invalid @ 1 (FIQ_26 / FIQ_32)
1125 .long __und_invalid @ 2 (IRQ_26 / IRQ_32)
1126 .long __und_svc @ 3 (SVC_26 / SVC_32)
1127 .long __und_invalid @ 4
1128 .long __und_invalid @ 5
1129 .long __und_invalid @ 6
1130 .long __und_invalid @ 7
1131 .long __und_invalid @ 8
1132 .long __und_invalid @ 9
1133 .long __und_invalid @ a
1134 .long __und_invalid @ b
1135 .long __und_invalid @ c
1136 .long __und_invalid @ d
1137 .long __und_invalid @ e
1138 .long __und_invalid @ f
1142 /*=============================================================================
1144 *-----------------------------------------------------------------------------
1145 * Enter in FIQ mode, spsr = ANY CPSR, lr = ANY PC
1146 * MUST PRESERVE SVC SPSR, but need to switch to SVC mode to show our msg.
1147 * Basically to switch modes, we *HAVE* to clobber one register... brain
1148 * damage alert! I don't think that we can execute any code in here in any
1149 * other mode than FIQ... Ok you can switch to another mode, but you can't
1150 * get out of that mode without clobbering one register.
1156 /*=============================================================================
1157 * Address exception handler
1158 *-----------------------------------------------------------------------------
1159 * These aren't too critical.
1160 * (they're not supposed to happen, and won't happen in 32-bit data mode).
1167 * We group all the following data together to optimise
1168 * for CPUs with separate I & D caches.
1178 .equ stubs_offset, __vectors_start + 0x200 - __stubs_start
1180 .globl __vectors_start
1182 ARM( swi SYS_ERROR0 )
1185 W(b) vector_und + stubs_offset
1186 W(ldr) pc, .LCvswi + stubs_offset
1187 W(b) vector_pabt + stubs_offset
1188 W(b) vector_dabt + stubs_offset
1189 W(b) vector_addrexcptn + stubs_offset
1190 W(b) vector_irq + stubs_offset
1191 W(b) vector_fiq + stubs_offset
1193 .globl __vectors_end
1199 .globl cr_no_alignment
1205 #ifdef CONFIG_MULTI_IRQ_HANDLER
1206 .globl handle_arch_irq