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>
35 #ifdef CONFIG_MULTI_IRQ_HANDLER
36 ldr r1, =handle_arch_irq
43 arch_irq_handler_default
48 @ PABORT handler takes pt_regs in r2, fault address in r4 and psr in r5
52 ldr pc, [ip, #PROCESSOR_PABT_FUNC]
61 @ Call the processor-specific abort handler:
64 @ r4 - aborted context pc
65 @ r5 - aborted context psr
67 @ The abort handler must return the aborted address in r0, and
68 @ the fault status register in r1. r9 must be preserved.
73 ldr pc, [ip, #PROCESSOR_DABT_FUNC]
80 .section .kprobes.text,"ax",%progbits
86 * Invalid mode handlers
88 .macro inv_entry, reason
89 sub sp, sp, #S_FRAME_SIZE
90 ARM( stmib sp, {r1 - lr} )
91 THUMB( stmia sp, {r0 - r12} )
92 THUMB( str sp, [sp, #S_SP] )
93 THUMB( str lr, [sp, #S_LR] )
98 inv_entry BAD_PREFETCH
100 ENDPROC(__pabt_invalid)
105 ENDPROC(__dabt_invalid)
110 ENDPROC(__irq_invalid)
113 inv_entry BAD_UNDEFINSTR
116 @ XXX fall through to common_invalid
120 @ common_invalid - generic code for failed exception (re-entrant version of handlers)
126 add r0, sp, #S_PC @ here for interlock avoidance
127 mov r7, #-1 @ "" "" "" ""
128 str r4, [sp] @ save preserved r0
129 stmia r0, {r5 - r7} @ lr_<exception>,
130 @ cpsr_<exception>, "old_r0"
134 ENDPROC(__und_invalid)
140 #if defined(CONFIG_AEABI) && (__LINUX_ARM_ARCH__ >= 5)
141 #define SPFIX(code...) code
143 #define SPFIX(code...)
146 .macro svc_entry, stack_hole=0
148 UNWIND(.save {r0 - pc} )
149 sub sp, sp, #(S_FRAME_SIZE + \stack_hole - 4)
150 #ifdef CONFIG_THUMB2_KERNEL
151 SPFIX( str r0, [sp] ) @ temporarily saved
153 SPFIX( tst r0, #4 ) @ test original stack alignment
154 SPFIX( ldr r0, [sp] ) @ restored
158 SPFIX( subeq sp, sp, #4 )
162 add r7, sp, #S_SP - 4 @ here for interlock avoidance
163 mov r6, #-1 @ "" "" "" ""
164 add r2, sp, #(S_FRAME_SIZE + \stack_hole - 4)
165 SPFIX( addeq r2, r2, #4 )
166 str r3, [sp, #-4]! @ save the "real" r0 copied
167 @ from the exception stack
172 @ We are now ready to fill in the remaining blanks on the stack:
176 @ r4 - lr_<exception>, already fixed up for correct return/restart
177 @ r5 - spsr_<exception>
178 @ r6 - orig_r0 (see pt_regs definition in ptrace.h)
182 #ifdef CONFIG_TRACE_IRQFLAGS
183 bl trace_hardirqs_off
194 @ IRQs off again before pulling preserved data off the stack
199 @ restore SPSR and restart the instruction
202 #ifdef CONFIG_TRACE_IRQFLAGS
204 bleq trace_hardirqs_on
206 blne trace_hardirqs_off
208 svc_exit r5 @ return from exception
217 #ifdef CONFIG_PREEMPT
219 ldr r8, [tsk, #TI_PREEMPT] @ get preempt count
220 ldr r0, [tsk, #TI_FLAGS] @ get flags
221 teq r8, #0 @ if preempt count != 0
222 movne r0, #0 @ force flags to 0
223 tst r0, #_TIF_NEED_RESCHED
227 #ifdef CONFIG_TRACE_IRQFLAGS
228 @ The parent context IRQs must have been enabled to get here in
229 @ the first place, so there's no point checking the PSR I bit.
232 svc_exit r5 @ return from exception
238 #ifdef CONFIG_PREEMPT
241 1: bl preempt_schedule_irq @ irq en/disable is done inside
242 ldr r0, [tsk, #TI_FLAGS] @ get new tasks TI_FLAGS
243 tst r0, #_TIF_NEED_RESCHED
244 moveq pc, r8 @ go again
250 #ifdef CONFIG_KPROBES
251 @ If a kprobe is about to simulate a "stmdb sp..." instruction,
252 @ it obviously needs free stack space which then will belong to
259 @ call emulation code, which returns using r9 if it has emulated
260 @ the instruction, or the more conventional lr if we are to treat
261 @ this as a real undefined instruction
265 #ifndef CONFIG_THUMB2_KERNEL
268 ldrh r0, [r4, #-2] @ Thumb instruction at LR - 2
270 cmp r9, #0xe800 @ 32-bit instruction if xx >= 0
271 ldrhhs r9, [r4] @ bottom 16 bits
272 orrhs r0, r9, r0, lsl #16
278 mov r0, sp @ struct pt_regs *regs
282 @ IRQs off again before pulling preserved data off the stack
284 1: disable_irq_notrace
287 @ restore SPSR and restart the instruction
289 ldr r5, [sp, #S_PSR] @ Get SVC cpsr
290 #ifdef CONFIG_TRACE_IRQFLAGS
292 bleq trace_hardirqs_on
294 blne trace_hardirqs_off
296 svc_exit r5 @ return from exception
307 @ IRQs off again before pulling preserved data off the stack
312 @ restore SPSR and restart the instruction
315 #ifdef CONFIG_TRACE_IRQFLAGS
317 bleq trace_hardirqs_on
319 blne trace_hardirqs_off
321 svc_exit r5 @ return from exception
338 * EABI note: sp_svc is always 64-bit aligned here, so should S_FRAME_SIZE
341 #if defined(CONFIG_AEABI) && (__LINUX_ARM_ARCH__ >= 5) && (S_FRAME_SIZE & 7)
342 #error "sizeof(struct pt_regs) must be a multiple of 8"
347 UNWIND(.cantunwind ) @ don't unwind the user space
348 sub sp, sp, #S_FRAME_SIZE
349 ARM( stmib sp, {r1 - r12} )
350 THUMB( stmia sp, {r0 - r12} )
353 add r0, sp, #S_PC @ here for interlock avoidance
354 mov r6, #-1 @ "" "" "" ""
356 str r3, [sp] @ save the "real" r0 copied
357 @ from the exception stack
360 @ We are now ready to fill in the remaining blanks on the stack:
362 @ r4 - lr_<exception>, already fixed up for correct return/restart
363 @ r5 - spsr_<exception>
364 @ r6 - orig_r0 (see pt_regs definition in ptrace.h)
366 @ Also, separately save sp_usr and lr_usr
369 ARM( stmdb r0, {sp, lr}^ )
370 THUMB( store_user_sp_lr r0, r1, S_SP - S_PC )
373 @ Enable the alignment trap while in kernel mode
378 @ Clear FP to mark the first stack frame
382 #ifdef CONFIG_IRQSOFF_TRACER
383 bl trace_hardirqs_off
387 .macro kuser_cmpxchg_check
388 #if __LINUX_ARM_ARCH__ < 6 && !defined(CONFIG_NEEDS_SYSCALL_FOR_CMPXCHG)
390 #warning "NPTL on non MMU needs fixing"
392 @ Make sure our user space atomic helper is restarted
393 @ if it was interrupted in a critical region. Here we
394 @ perform a quick test inline since it should be false
395 @ 99.9999% of the time. The rest is done out of line.
397 blhs kuser_cmpxchg_fixup
419 b ret_to_user_from_irq
433 @ fall through to the emulation code, which returns using r9 if
434 @ it has emulated the instruction, or the more conventional lr
435 @ if we are to treat this as a real undefined instruction
439 adr r9, BSYM(ret_from_exception)
440 adr lr, BSYM(__und_usr_unknown)
441 tst r3, #PSR_T_BIT @ Thumb mode?
442 itet eq @ explicit IT needed for the 1f label
443 subeq r4, r2, #4 @ ARM instr at LR - 4
444 subne r4, r2, #2 @ Thumb instr at LR - 2
446 #ifdef CONFIG_CPU_ENDIAN_BE8
447 reveq r0, r0 @ little endian instruction
451 #if __LINUX_ARM_ARCH__ >= 7
453 ARM( ldrht r5, [r4], #2 )
454 THUMB( ldrht r5, [r4] )
455 THUMB( add r4, r4, #2 )
456 and r0, r5, #0xf800 @ mask bits 111x x... .... ....
457 cmp r0, #0xe800 @ 32bit instruction if xx != 0
458 blo __und_usr_unknown
460 add r2, r2, #2 @ r2 is PC + 2, make it PC + 4
461 orr r0, r0, r5, lsl #16
469 @ fallthrough to call_fpe
473 * The out of line fixup for the ldrt above.
475 .pushsection .fixup, "ax"
478 .pushsection __ex_table,"a"
480 #if __LINUX_ARM_ARCH__ >= 7
487 * Check whether the instruction is a co-processor instruction.
488 * If yes, we need to call the relevant co-processor handler.
490 * Note that we don't do a full check here for the co-processor
491 * instructions; all instructions with bit 27 set are well
492 * defined. The only instructions that should fault are the
493 * co-processor instructions. However, we have to watch out
494 * for the ARM6/ARM7 SWI bug.
496 * NEON is a special case that has to be handled here. Not all
497 * NEON instructions are co-processor instructions, so we have
498 * to make a special case of checking for them. Plus, there's
499 * five groups of them, so we have a table of mask/opcode pairs
500 * to check against, and if any match then we branch off into the
503 * Emulators may wish to make use of the following registers:
504 * r0 = instruction opcode.
506 * r9 = normal "successful" return address
507 * r10 = this threads thread_info structure.
508 * lr = unrecognised instruction return address
511 @ Fall-through from Thumb-2 __und_usr
514 adr r6, .LCneon_thumb_opcodes
519 adr r6, .LCneon_arm_opcodes
521 ldr r7, [r6], #4 @ mask value
522 cmp r7, #0 @ end mask?
525 ldr r7, [r6], #4 @ opcode bits matching in mask
526 cmp r8, r7 @ NEON instruction?
530 strb r7, [r10, #TI_USED_CP + 10] @ mark CP#10 as used
531 strb r7, [r10, #TI_USED_CP + 11] @ mark CP#11 as used
532 b do_vfp @ let VFP handler handle this
535 tst r0, #0x08000000 @ only CDP/CPRT/LDC/STC have bit 27
536 tstne r0, #0x04000000 @ bit 26 set on both ARM and Thumb-2
537 #if defined(CONFIG_CPU_ARM610) || defined(CONFIG_CPU_ARM710)
538 and r8, r0, #0x0f000000 @ mask out op-code bits
539 teqne r8, #0x0f000000 @ SWI (ARM6/7 bug)?
542 get_thread_info r10 @ get current thread
543 and r8, r0, #0x00000f00 @ mask out CP number
544 THUMB( lsr r8, r8, #8 )
546 add r6, r10, #TI_USED_CP
547 ARM( strb r7, [r6, r8, lsr #8] ) @ set appropriate used_cp[]
548 THUMB( strb r7, [r6, r8] ) @ set appropriate used_cp[]
550 @ Test if we need to give access to iWMMXt coprocessors
551 ldr r5, [r10, #TI_FLAGS]
552 rsbs r7, r8, #(1 << 8) @ CP 0 or 1 only
553 movcss r7, r5, lsr #(TIF_USING_IWMMXT + 1)
554 bcs iwmmxt_task_enable
556 ARM( add pc, pc, r8, lsr #6 )
557 THUMB( lsl r8, r8, #2 )
562 W(b) do_fpe @ CP#1 (FPE)
563 W(b) do_fpe @ CP#2 (FPE)
566 b crunch_task_enable @ CP#4 (MaverickCrunch)
567 b crunch_task_enable @ CP#5 (MaverickCrunch)
568 b crunch_task_enable @ CP#6 (MaverickCrunch)
578 W(b) do_vfp @ CP#10 (VFP)
579 W(b) do_vfp @ CP#11 (VFP)
581 movw_pc lr @ CP#10 (VFP)
582 movw_pc lr @ CP#11 (VFP)
586 movw_pc lr @ CP#14 (Debug)
587 movw_pc lr @ CP#15 (Control)
593 .word 0xfe000000 @ mask
594 .word 0xf2000000 @ opcode
596 .word 0xff100000 @ mask
597 .word 0xf4000000 @ opcode
599 .word 0x00000000 @ mask
600 .word 0x00000000 @ opcode
602 .LCneon_thumb_opcodes:
603 .word 0xef000000 @ mask
604 .word 0xef000000 @ opcode
606 .word 0xff100000 @ mask
607 .word 0xf9000000 @ opcode
609 .word 0x00000000 @ mask
610 .word 0x00000000 @ opcode
616 add r10, r10, #TI_FPSTATE @ r10 = workspace
617 ldr pc, [r4] @ Call FP module USR entry point
620 * The FP module is called with these registers set:
623 * r9 = normal "successful" return address
625 * lr = unrecognised FP instruction return address
640 adr lr, BSYM(ret_from_exception)
642 ENDPROC(__und_usr_unknown)
652 * This is the return code to user mode for abort handlers
654 ENTRY(ret_from_exception)
662 ENDPROC(ret_from_exception)
665 * Register switch for ARMv3 and ARMv4 processors
666 * r0 = previous task_struct, r1 = previous thread_info, r2 = next thread_info
667 * previous and next are guaranteed not to be the same.
672 add ip, r1, #TI_CPU_SAVE
673 ldr r3, [r2, #TI_TP_VALUE]
674 ARM( stmia ip!, {r4 - sl, fp, sp, lr} ) @ Store most regs on stack
675 THUMB( stmia ip!, {r4 - sl, fp} ) @ Store most regs on stack
676 THUMB( str sp, [ip], #4 )
677 THUMB( str lr, [ip], #4 )
678 #ifdef CONFIG_CPU_USE_DOMAINS
679 ldr r6, [r2, #TI_CPU_DOMAIN]
682 #if defined(CONFIG_CC_STACKPROTECTOR) && !defined(CONFIG_SMP)
683 ldr r7, [r2, #TI_TASK]
684 ldr r8, =__stack_chk_guard
685 ldr r7, [r7, #TSK_STACK_CANARY]
687 #ifdef CONFIG_CPU_USE_DOMAINS
688 mcr p15, 0, r6, c3, c0, 0 @ Set domain register
691 add r4, r2, #TI_CPU_SAVE
692 ldr r0, =thread_notify_head
693 mov r1, #THREAD_NOTIFY_SWITCH
694 bl atomic_notifier_call_chain
695 #if defined(CONFIG_CC_STACKPROTECTOR) && !defined(CONFIG_SMP)
700 ARM( ldmia r4, {r4 - sl, fp, sp, pc} ) @ Load all regs saved previously
701 THUMB( ldmia ip!, {r4 - sl, fp} ) @ Load all regs saved previously
702 THUMB( ldr sp, [ip], #4 )
703 THUMB( ldr pc, [ip] )
712 * These are segment of kernel provided user code reachable from user space
713 * at a fixed address in kernel memory. This is used to provide user space
714 * with some operations which require kernel help because of unimplemented
715 * native feature and/or instructions in many ARM CPUs. The idea is for
716 * this code to be executed directly in user mode for best efficiency but
717 * which is too intimate with the kernel counter part to be left to user
718 * libraries. In fact this code might even differ from one CPU to another
719 * depending on the available instruction set and restrictions like on
720 * SMP systems. In other words, the kernel reserves the right to change
721 * this code as needed without warning. Only the entry points and their
722 * results are guaranteed to be stable.
724 * Each segment is 32-byte aligned and will be moved to the top of the high
725 * vector page. New segments (if ever needed) must be added in front of
726 * existing ones. This mechanism should be used only for things that are
727 * really small and justified, and not be abused freely.
729 * User space is expected to implement those things inline when optimizing
730 * for a processor that has the necessary native support, but only if such
731 * resulting binaries are already to be incompatible with earlier ARM
732 * processors due to the use of unsupported instructions other than what
733 * is provided here. In other words don't make binaries unable to run on
734 * earlier processors just for the sake of not using these kernel helpers
735 * if your compiled code is not going to use the new instructions for other
741 #ifdef CONFIG_ARM_THUMB
749 .globl __kuser_helper_start
750 __kuser_helper_start:
753 * Reference prototype:
755 * void __kernel_memory_barrier(void)
759 * lr = return address
769 * Definition and user space usage example:
771 * typedef void (__kernel_dmb_t)(void);
772 * #define __kernel_dmb (*(__kernel_dmb_t *)0xffff0fa0)
774 * Apply any needed memory barrier to preserve consistency with data modified
775 * manually and __kuser_cmpxchg usage.
777 * This could be used as follows:
779 * #define __kernel_dmb() \
780 * asm volatile ( "mov r0, #0xffff0fff; mov lr, pc; sub pc, r0, #95" \
781 * : : : "r0", "lr","cc" )
784 __kuser_memory_barrier: @ 0xffff0fa0
791 * Reference prototype:
793 * int __kernel_cmpxchg(int oldval, int newval, int *ptr)
800 * lr = return address
804 * r0 = returned value (zero or non-zero)
805 * C flag = set if r0 == 0, clear if r0 != 0
811 * Definition and user space usage example:
813 * typedef int (__kernel_cmpxchg_t)(int oldval, int newval, int *ptr);
814 * #define __kernel_cmpxchg (*(__kernel_cmpxchg_t *)0xffff0fc0)
816 * Atomically store newval in *ptr if *ptr is equal to oldval for user space.
817 * Return zero if *ptr was changed or non-zero if no exchange happened.
818 * The C flag is also set if *ptr was changed to allow for assembly
819 * optimization in the calling code.
823 * - This routine already includes memory barriers as needed.
825 * For example, a user space atomic_add implementation could look like this:
827 * #define atomic_add(ptr, val) \
828 * ({ register unsigned int *__ptr asm("r2") = (ptr); \
829 * register unsigned int __result asm("r1"); \
831 * "1: @ atomic_add\n\t" \
832 * "ldr r0, [r2]\n\t" \
833 * "mov r3, #0xffff0fff\n\t" \
834 * "add lr, pc, #4\n\t" \
835 * "add r1, r0, %2\n\t" \
836 * "add pc, r3, #(0xffff0fc0 - 0xffff0fff)\n\t" \
838 * : "=&r" (__result) \
839 * : "r" (__ptr), "rIL" (val) \
840 * : "r0","r3","ip","lr","cc","memory" ); \
844 __kuser_cmpxchg: @ 0xffff0fc0
846 #if defined(CONFIG_NEEDS_SYSCALL_FOR_CMPXCHG)
849 * Poor you. No fast solution possible...
850 * The kernel itself must perform the operation.
851 * A special ghost syscall is used for that (see traps.c).
854 ldr r7, 1f @ it's 20 bits
857 1: .word __ARM_NR_cmpxchg
859 #elif __LINUX_ARM_ARCH__ < 6
864 * The only thing that can break atomicity in this cmpxchg
865 * implementation is either an IRQ or a data abort exception
866 * causing another process/thread to be scheduled in the middle
867 * of the critical sequence. To prevent this, code is added to
868 * the IRQ and data abort exception handlers to set the pc back
869 * to the beginning of the critical section if it is found to be
870 * within that critical section (see kuser_cmpxchg_fixup).
872 1: ldr r3, [r2] @ load current val
873 subs r3, r3, r0 @ compare with oldval
874 2: streq r1, [r2] @ store newval if eq
875 rsbs r0, r3, #0 @ set return val and C flag
880 @ Called from kuser_cmpxchg_check macro.
881 @ r4 = address of interrupted insn (must be preserved).
882 @ sp = saved regs. r7 and r8 are clobbered.
883 @ 1b = first critical insn, 2b = last critical insn.
884 @ If r4 >= 1b and r4 <= 2b then saved pc_usr is set to 1b.
886 sub r7, r7, #(0xffff0fff - (0xffff0fc0 + (1b - __kuser_cmpxchg)))
888 rsbcss r8, r8, #(2b - 1b)
889 strcs r7, [sp, #S_PC]
894 #warning "NPTL on non MMU needs fixing"
909 /* beware -- each __kuser slot must be 8 instructions max */
910 ALT_SMP(b __kuser_memory_barrier)
918 * Reference prototype:
920 * int __kernel_get_tls(void)
924 * lr = return address
934 * Definition and user space usage example:
936 * typedef int (__kernel_get_tls_t)(void);
937 * #define __kernel_get_tls (*(__kernel_get_tls_t *)0xffff0fe0)
939 * Get the TLS value as previously set via the __ARM_NR_set_tls syscall.
941 * This could be used as follows:
943 * #define __kernel_get_tls() \
944 * ({ register unsigned int __val asm("r0"); \
945 * asm( "mov r0, #0xffff0fff; mov lr, pc; sub pc, r0, #31" \
946 * : "=r" (__val) : : "lr","cc" ); \
950 __kuser_get_tls: @ 0xffff0fe0
951 ldr r0, [pc, #(16 - 8)] @ read TLS, set in kuser_get_tls_init
953 mrc p15, 0, r0, c13, c0, 3 @ 0xffff0fe8 hardware TLS code
955 .word 0 @ 0xffff0ff0 software TLS value, then
956 .endr @ pad up to __kuser_helper_version
959 * Reference declaration:
961 * extern unsigned int __kernel_helper_version;
963 * Definition and user space usage example:
965 * #define __kernel_helper_version (*(unsigned int *)0xffff0ffc)
967 * User space may read this to determine the curent number of helpers
971 __kuser_helper_version: @ 0xffff0ffc
972 .word ((__kuser_helper_end - __kuser_helper_start) >> 5)
974 .globl __kuser_helper_end
982 * This code is copied to 0xffff0200 so we can use branches in the
983 * vectors, rather than ldr's. Note that this code must not
984 * exceed 0x300 bytes.
986 * Common stub entry macro:
987 * Enter in IRQ mode, spsr = SVC/USR CPSR, lr = SVC/USR PC
989 * SP points to a minimal amount of processor-private memory, the address
990 * of which is copied into r0 for the mode specific abort handler.
992 .macro vector_stub, name, mode, correction=0
997 sub lr, lr, #\correction
1001 @ Save r0, lr_<exception> (parent PC) and spsr_<exception>
1004 stmia sp, {r0, lr} @ save r0, lr
1006 str lr, [sp, #8] @ save spsr
1009 @ Prepare for SVC32 mode. IRQs remain disabled.
1012 eor r0, r0, #(\mode ^ SVC_MODE | PSR_ISETSTATE)
1016 @ the branch table must immediately follow this code
1020 THUMB( ldr lr, [r0, lr, lsl #2] )
1022 ARM( ldr lr, [pc, lr, lsl #2] )
1023 movs pc, lr @ branch to handler in SVC mode
1024 ENDPROC(vector_\name)
1027 @ handler addresses follow this label
1031 .globl __stubs_start
1034 * Interrupt dispatcher
1036 vector_stub irq, IRQ_MODE, 4
1038 .long __irq_usr @ 0 (USR_26 / USR_32)
1039 .long __irq_invalid @ 1 (FIQ_26 / FIQ_32)
1040 .long __irq_invalid @ 2 (IRQ_26 / IRQ_32)
1041 .long __irq_svc @ 3 (SVC_26 / SVC_32)
1042 .long __irq_invalid @ 4
1043 .long __irq_invalid @ 5
1044 .long __irq_invalid @ 6
1045 .long __irq_invalid @ 7
1046 .long __irq_invalid @ 8
1047 .long __irq_invalid @ 9
1048 .long __irq_invalid @ a
1049 .long __irq_invalid @ b
1050 .long __irq_invalid @ c
1051 .long __irq_invalid @ d
1052 .long __irq_invalid @ e
1053 .long __irq_invalid @ f
1056 * Data abort dispatcher
1057 * Enter in ABT mode, spsr = USR CPSR, lr = USR PC
1059 vector_stub dabt, ABT_MODE, 8
1061 .long __dabt_usr @ 0 (USR_26 / USR_32)
1062 .long __dabt_invalid @ 1 (FIQ_26 / FIQ_32)
1063 .long __dabt_invalid @ 2 (IRQ_26 / IRQ_32)
1064 .long __dabt_svc @ 3 (SVC_26 / SVC_32)
1065 .long __dabt_invalid @ 4
1066 .long __dabt_invalid @ 5
1067 .long __dabt_invalid @ 6
1068 .long __dabt_invalid @ 7
1069 .long __dabt_invalid @ 8
1070 .long __dabt_invalid @ 9
1071 .long __dabt_invalid @ a
1072 .long __dabt_invalid @ b
1073 .long __dabt_invalid @ c
1074 .long __dabt_invalid @ d
1075 .long __dabt_invalid @ e
1076 .long __dabt_invalid @ f
1079 * Prefetch abort dispatcher
1080 * Enter in ABT mode, spsr = USR CPSR, lr = USR PC
1082 vector_stub pabt, ABT_MODE, 4
1084 .long __pabt_usr @ 0 (USR_26 / USR_32)
1085 .long __pabt_invalid @ 1 (FIQ_26 / FIQ_32)
1086 .long __pabt_invalid @ 2 (IRQ_26 / IRQ_32)
1087 .long __pabt_svc @ 3 (SVC_26 / SVC_32)
1088 .long __pabt_invalid @ 4
1089 .long __pabt_invalid @ 5
1090 .long __pabt_invalid @ 6
1091 .long __pabt_invalid @ 7
1092 .long __pabt_invalid @ 8
1093 .long __pabt_invalid @ 9
1094 .long __pabt_invalid @ a
1095 .long __pabt_invalid @ b
1096 .long __pabt_invalid @ c
1097 .long __pabt_invalid @ d
1098 .long __pabt_invalid @ e
1099 .long __pabt_invalid @ f
1102 * Undef instr entry dispatcher
1103 * Enter in UND mode, spsr = SVC/USR CPSR, lr = SVC/USR PC
1105 vector_stub und, UND_MODE
1107 .long __und_usr @ 0 (USR_26 / USR_32)
1108 .long __und_invalid @ 1 (FIQ_26 / FIQ_32)
1109 .long __und_invalid @ 2 (IRQ_26 / IRQ_32)
1110 .long __und_svc @ 3 (SVC_26 / SVC_32)
1111 .long __und_invalid @ 4
1112 .long __und_invalid @ 5
1113 .long __und_invalid @ 6
1114 .long __und_invalid @ 7
1115 .long __und_invalid @ 8
1116 .long __und_invalid @ 9
1117 .long __und_invalid @ a
1118 .long __und_invalid @ b
1119 .long __und_invalid @ c
1120 .long __und_invalid @ d
1121 .long __und_invalid @ e
1122 .long __und_invalid @ f
1126 /*=============================================================================
1128 *-----------------------------------------------------------------------------
1129 * Enter in FIQ mode, spsr = ANY CPSR, lr = ANY PC
1130 * MUST PRESERVE SVC SPSR, but need to switch to SVC mode to show our msg.
1131 * Basically to switch modes, we *HAVE* to clobber one register... brain
1132 * damage alert! I don't think that we can execute any code in here in any
1133 * other mode than FIQ... Ok you can switch to another mode, but you can't
1134 * get out of that mode without clobbering one register.
1140 /*=============================================================================
1141 * Address exception handler
1142 *-----------------------------------------------------------------------------
1143 * These aren't too critical.
1144 * (they're not supposed to happen, and won't happen in 32-bit data mode).
1151 * We group all the following data together to optimise
1152 * for CPUs with separate I & D caches.
1162 .equ stubs_offset, __vectors_start + 0x200 - __stubs_start
1164 .globl __vectors_start
1166 ARM( swi SYS_ERROR0 )
1169 W(b) vector_und + stubs_offset
1170 W(ldr) pc, .LCvswi + stubs_offset
1171 W(b) vector_pabt + stubs_offset
1172 W(b) vector_dabt + stubs_offset
1173 W(b) vector_addrexcptn + stubs_offset
1174 W(b) vector_irq + stubs_offset
1175 W(b) vector_fiq + stubs_offset
1177 .globl __vectors_end
1183 .globl cr_no_alignment
1189 #ifdef CONFIG_MULTI_IRQ_HANDLER
1190 .globl handle_arch_irq