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/assembler.h>
19 #include <asm/memory.h>
20 #include <asm/glue-df.h>
21 #include <asm/glue-pf.h>
22 #include <asm/vfpmacros.h>
23 #ifndef CONFIG_MULTI_IRQ_HANDLER
24 #include <mach/entry-macro.S>
26 #include <asm/thread_notify.h>
27 #include <asm/unwind.h>
28 #include <asm/unistd.h>
30 #include <asm/system_info.h>
32 #include "entry-header.S"
33 #include <asm/entry-macro-multi.S>
39 #ifdef CONFIG_MULTI_IRQ_HANDLER
40 ldr r1, =handle_arch_irq
45 arch_irq_handler_default
51 @ PABORT handler takes pt_regs in r2, fault address in r4 and psr in r5
55 ldr pc, [ip, #PROCESSOR_PABT_FUNC]
64 @ Call the processor-specific abort handler:
67 @ r4 - aborted context pc
68 @ r5 - aborted context psr
70 @ The abort handler must return the aborted address in r0, and
71 @ the fault status register in r1. r9 must be preserved.
76 ldr pc, [ip, #PROCESSOR_DABT_FUNC]
83 .section .kprobes.text,"ax",%progbits
89 * Invalid mode handlers
91 .macro inv_entry, reason
92 sub sp, sp, #S_FRAME_SIZE
93 ARM( stmib sp, {r1 - lr} )
94 THUMB( stmia sp, {r0 - r12} )
95 THUMB( str sp, [sp, #S_SP] )
96 THUMB( str lr, [sp, #S_LR] )
101 inv_entry BAD_PREFETCH
103 ENDPROC(__pabt_invalid)
108 ENDPROC(__dabt_invalid)
113 ENDPROC(__irq_invalid)
116 inv_entry BAD_UNDEFINSTR
119 @ XXX fall through to common_invalid
123 @ common_invalid - generic code for failed exception (re-entrant version of handlers)
129 add r0, sp, #S_PC @ here for interlock avoidance
130 mov r7, #-1 @ "" "" "" ""
131 str r4, [sp] @ save preserved r0
132 stmia r0, {r5 - r7} @ lr_<exception>,
133 @ cpsr_<exception>, "old_r0"
137 ENDPROC(__und_invalid)
143 #if defined(CONFIG_AEABI) && (__LINUX_ARM_ARCH__ >= 5)
144 #define SPFIX(code...) code
146 #define SPFIX(code...)
149 .macro svc_entry, stack_hole=0
151 UNWIND(.save {r0 - pc} )
152 sub sp, sp, #(S_FRAME_SIZE + \stack_hole - 4)
153 #ifdef CONFIG_THUMB2_KERNEL
154 SPFIX( str r0, [sp] ) @ temporarily saved
156 SPFIX( tst r0, #4 ) @ test original stack alignment
157 SPFIX( ldr r0, [sp] ) @ restored
161 SPFIX( subeq sp, sp, #4 )
165 add r7, sp, #S_SP - 4 @ here for interlock avoidance
166 mov r6, #-1 @ "" "" "" ""
167 add r2, sp, #(S_FRAME_SIZE + \stack_hole - 4)
168 SPFIX( addeq r2, r2, #4 )
169 str r3, [sp, #-4]! @ save the "real" r0 copied
170 @ from the exception stack
175 @ We are now ready to fill in the remaining blanks on the stack:
179 @ r4 - lr_<exception>, already fixed up for correct return/restart
180 @ r5 - spsr_<exception>
181 @ r6 - orig_r0 (see pt_regs definition in ptrace.h)
185 #ifdef CONFIG_TRACE_IRQFLAGS
186 bl trace_hardirqs_off
195 THUMB( ldr r5, [sp, #S_PSR] ) @ potentially updated CPSR
196 svc_exit r5 @ return from exception
205 #ifdef CONFIG_PREEMPT
207 ldr r8, [tsk, #TI_PREEMPT] @ get preempt count
208 ldr r0, [tsk, #TI_FLAGS] @ get flags
209 teq r8, #0 @ if preempt count != 0
210 movne r0, #0 @ force flags to 0
211 tst r0, #_TIF_NEED_RESCHED
215 svc_exit r5, irq = 1 @ return from exception
221 #ifdef CONFIG_PREEMPT
224 1: bl preempt_schedule_irq @ irq en/disable is done inside
225 ldr r0, [tsk, #TI_FLAGS] @ get new tasks TI_FLAGS
226 tst r0, #_TIF_NEED_RESCHED
227 moveq pc, r8 @ go again
232 @ Correct the PC such that it is pointing at the instruction
233 @ which caused the fault. If the faulting instruction was ARM
234 @ the PC will be pointing at the next instruction, and have to
235 @ subtract 4. Otherwise, it is Thumb, and the PC will be
236 @ pointing at the second half of the Thumb instruction. We
237 @ have to subtract 2.
246 #ifdef CONFIG_KPROBES
247 @ If a kprobe is about to simulate a "stmdb sp..." instruction,
248 @ it obviously needs free stack space which then will belong to
255 @ call emulation code, which returns using r9 if it has emulated
256 @ the instruction, or the more conventional lr if we are to treat
257 @ this as a real undefined instruction
261 #ifndef CONFIG_THUMB2_KERNEL
265 ldrh r0, [r4, #-2] @ Thumb instruction at LR - 2
266 cmp r0, #0xe800 @ 32-bit instruction if xx >= 0
268 ldrh r9, [r4] @ bottom 16 bits
271 orr r0, r9, r0, lsl #16
273 adr r9, BSYM(__und_svc_finish)
277 mov r1, #4 @ PC correction to apply
279 mov r0, sp @ struct pt_regs *regs
283 ldr r5, [sp, #S_PSR] @ Get SVC cpsr
284 svc_exit r5 @ return from exception
293 svc_exit r5 @ return from exception
310 * EABI note: sp_svc is always 64-bit aligned here, so should S_FRAME_SIZE
313 #if defined(CONFIG_AEABI) && (__LINUX_ARM_ARCH__ >= 5) && (S_FRAME_SIZE & 7)
314 #error "sizeof(struct pt_regs) must be a multiple of 8"
319 UNWIND(.cantunwind ) @ don't unwind the user space
320 sub sp, sp, #S_FRAME_SIZE
321 ARM( stmib sp, {r1 - r12} )
322 THUMB( stmia sp, {r0 - r12} )
325 add r0, sp, #S_PC @ here for interlock avoidance
326 mov r6, #-1 @ "" "" "" ""
328 str r3, [sp] @ save the "real" r0 copied
329 @ from the exception stack
332 @ We are now ready to fill in the remaining blanks on the stack:
334 @ r4 - lr_<exception>, already fixed up for correct return/restart
335 @ r5 - spsr_<exception>
336 @ r6 - orig_r0 (see pt_regs definition in ptrace.h)
338 @ Also, separately save sp_usr and lr_usr
341 ARM( stmdb r0, {sp, lr}^ )
342 THUMB( store_user_sp_lr r0, r1, S_SP - S_PC )
345 @ Enable the alignment trap while in kernel mode
350 @ Clear FP to mark the first stack frame
354 #ifdef CONFIG_IRQSOFF_TRACER
355 bl trace_hardirqs_off
357 ct_user_exit save = 0
360 .macro kuser_cmpxchg_check
361 #if !defined(CONFIG_CPU_32v6K) && defined(CONFIG_KUSER_HELPERS) && \
362 !defined(CONFIG_NEEDS_SYSCALL_FOR_CMPXCHG)
364 #warning "NPTL on non MMU needs fixing"
366 @ Make sure our user space atomic helper is restarted
367 @ if it was interrupted in a critical region. Here we
368 @ perform a quick test inline since it should be false
369 @ 99.9999% of the time. The rest is done out of line.
371 blhs kuser_cmpxchg64_fixup
393 b ret_to_user_from_irq
406 @ r2 = regs->ARM_pc, which is either 2 or 4 bytes ahead of the
407 @ faulting instruction depending on Thumb mode.
408 @ r3 = regs->ARM_cpsr
410 @ The emulation code returns using r9 if it has emulated the
411 @ instruction, or the more conventional lr if we are to treat
412 @ this as a real undefined instruction
414 adr r9, BSYM(ret_from_exception)
416 @ IRQs must be enabled before attempting to read the instruction from
417 @ user space since that could cause a page/translation fault if the
418 @ page table was modified by another CPU.
421 tst r3, #PSR_T_BIT @ Thumb mode?
423 sub r4, r2, #4 @ ARM instr at LR - 4
425 ARM_BE8(rev r0, r0) @ little endian instruction
427 @ r0 = 32-bit ARM instruction which caused the exception
428 @ r2 = PC value for the following instruction (:= regs->ARM_pc)
429 @ r4 = PC value for the faulting instruction
430 @ lr = 32-bit undefined instruction function
431 adr lr, BSYM(__und_usr_fault_32)
436 sub r4, r2, #2 @ First half of thumb instr at LR - 2
437 #if CONFIG_ARM_THUMB && __LINUX_ARM_ARCH__ >= 6 && CONFIG_CPU_V7
439 * Thumb-2 instruction handling. Note that because pre-v6 and >= v6 platforms
440 * can never be supported in a single kernel, this code is not applicable at
441 * all when __LINUX_ARM_ARCH__ < 6. This allows simplifying assumptions to be
442 * made about .arch directives.
444 #if __LINUX_ARM_ARCH__ < 7
445 /* If the target CPU may not be Thumb-2-capable, a run-time check is needed: */
446 #define NEED_CPU_ARCHITECTURE
447 ldr r5, .LCcpu_architecture
449 cmp r5, #CPU_ARCH_ARMv7
450 blo __und_usr_fault_16 @ 16bit undefined instruction
452 * The following code won't get run unless the running CPU really is v7, so
453 * coding round the lack of ldrht on older arches is pointless. Temporarily
454 * override the assembler target arch with the minimum required instead:
459 ARM_BE8(rev16 r5, r5) @ little endian instruction
460 cmp r5, #0xe800 @ 32bit instruction if xx != 0
461 blo __und_usr_fault_16 @ 16bit undefined instruction
463 ARM_BE8(rev16 r0, r0) @ little endian instruction
464 add r2, r2, #2 @ r2 is PC + 2, make it PC + 4
465 str r2, [sp, #S_PC] @ it's a 2x16bit instr, update
466 orr r0, r0, r5, lsl #16
467 adr lr, BSYM(__und_usr_fault_32)
468 @ r0 = the two 16-bit Thumb instructions which caused the exception
469 @ r2 = PC value for the following Thumb instruction (:= regs->ARM_pc)
470 @ r4 = PC value for the first 16-bit Thumb instruction
471 @ lr = 32bit undefined instruction function
473 #if __LINUX_ARM_ARCH__ < 7
474 /* If the target arch was overridden, change it back: */
475 #ifdef CONFIG_CPU_32v6K
480 #endif /* __LINUX_ARM_ARCH__ < 7 */
481 #else /* !(CONFIG_ARM_THUMB && __LINUX_ARM_ARCH__ >= 6 && CONFIG_CPU_V7) */
488 * The out of line fixup for the ldrt instructions above.
490 .pushsection .fixup, "ax"
494 .pushsection __ex_table,"a"
496 #if CONFIG_ARM_THUMB && __LINUX_ARM_ARCH__ >= 6 && CONFIG_CPU_V7
503 * Check whether the instruction is a co-processor instruction.
504 * If yes, we need to call the relevant co-processor handler.
506 * Note that we don't do a full check here for the co-processor
507 * instructions; all instructions with bit 27 set are well
508 * defined. The only instructions that should fault are the
509 * co-processor instructions. However, we have to watch out
510 * for the ARM6/ARM7 SWI bug.
512 * NEON is a special case that has to be handled here. Not all
513 * NEON instructions are co-processor instructions, so we have
514 * to make a special case of checking for them. Plus, there's
515 * five groups of them, so we have a table of mask/opcode pairs
516 * to check against, and if any match then we branch off into the
519 * Emulators may wish to make use of the following registers:
520 * r0 = instruction opcode (32-bit ARM or two 16-bit Thumb)
521 * r2 = PC value to resume execution after successful emulation
522 * r9 = normal "successful" return address
523 * r10 = this threads thread_info structure
524 * lr = unrecognised instruction return address
525 * IRQs enabled, FIQs enabled.
528 @ Fall-through from Thumb-2 __und_usr
531 get_thread_info r10 @ get current thread
532 adr r6, .LCneon_thumb_opcodes
536 get_thread_info r10 @ get current thread
538 adr r6, .LCneon_arm_opcodes
539 2: ldr r5, [r6], #4 @ mask value
540 ldr r7, [r6], #4 @ opcode bits matching in mask
541 cmp r5, #0 @ end mask?
544 cmp r8, r7 @ NEON instruction?
547 strb r7, [r10, #TI_USED_CP + 10] @ mark CP#10 as used
548 strb r7, [r10, #TI_USED_CP + 11] @ mark CP#11 as used
549 b do_vfp @ let VFP handler handle this
552 tst r0, #0x08000000 @ only CDP/CPRT/LDC/STC have bit 27
553 tstne r0, #0x04000000 @ bit 26 set on both ARM and Thumb-2
555 and r8, r0, #0x00000f00 @ mask out CP number
556 THUMB( lsr r8, r8, #8 )
558 add r6, r10, #TI_USED_CP
559 ARM( strb r7, [r6, r8, lsr #8] ) @ set appropriate used_cp[]
560 THUMB( strb r7, [r6, r8] ) @ set appropriate used_cp[]
562 @ Test if we need to give access to iWMMXt coprocessors
563 ldr r5, [r10, #TI_FLAGS]
564 rsbs r7, r8, #(1 << 8) @ CP 0 or 1 only
565 movcss r7, r5, lsr #(TIF_USING_IWMMXT + 1)
566 bcs iwmmxt_task_enable
568 ARM( add pc, pc, r8, lsr #6 )
569 THUMB( lsl r8, r8, #2 )
574 W(b) do_fpe @ CP#1 (FPE)
575 W(b) do_fpe @ CP#2 (FPE)
578 b crunch_task_enable @ CP#4 (MaverickCrunch)
579 b crunch_task_enable @ CP#5 (MaverickCrunch)
580 b crunch_task_enable @ CP#6 (MaverickCrunch)
590 W(b) do_vfp @ CP#10 (VFP)
591 W(b) do_vfp @ CP#11 (VFP)
593 movw_pc lr @ CP#10 (VFP)
594 movw_pc lr @ CP#11 (VFP)
598 movw_pc lr @ CP#14 (Debug)
599 movw_pc lr @ CP#15 (Control)
601 #ifdef NEED_CPU_ARCHITECTURE
604 .word __cpu_architecture
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
633 add r10, r10, #TI_FPSTATE @ r10 = workspace
634 ldr pc, [r4] @ Call FP module USR entry point
637 * The FP module is called with these registers set:
640 * r9 = normal "successful" return address
642 * lr = unrecognised FP instruction return address
660 adr lr, BSYM(ret_from_exception)
662 ENDPROC(__und_usr_fault_32)
663 ENDPROC(__und_usr_fault_16)
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 ARM( stmia ip!, {r4 - sl, fp, sp, lr} ) @ Store most regs on stack
695 THUMB( stmia ip!, {r4 - sl, fp} ) @ Store most regs on stack
696 THUMB( str sp, [ip], #4 )
697 THUMB( str lr, [ip], #4 )
698 ldr r4, [r2, #TI_TP_VALUE]
699 ldr r5, [r2, #TI_TP_VALUE + 4]
700 #ifdef CONFIG_CPU_USE_DOMAINS
701 ldr r6, [r2, #TI_CPU_DOMAIN]
703 switch_tls r1, r4, r5, r3, r7
704 #if defined(CONFIG_CC_STACKPROTECTOR) && !defined(CONFIG_SMP)
705 ldr r7, [r2, #TI_TASK]
706 ldr r8, =__stack_chk_guard
707 ldr r7, [r7, #TSK_STACK_CANARY]
709 #ifdef CONFIG_CPU_USE_DOMAINS
710 mcr p15, 0, r6, c3, c0, 0 @ Set domain register
713 add r4, r2, #TI_CPU_SAVE
714 ldr r0, =thread_notify_head
715 mov r1, #THREAD_NOTIFY_SWITCH
716 bl atomic_notifier_call_chain
717 #if defined(CONFIG_CC_STACKPROTECTOR) && !defined(CONFIG_SMP)
722 ARM( ldmia r4, {r4 - sl, fp, sp, pc} ) @ Load all regs saved previously
723 THUMB( ldmia ip!, {r4 - sl, fp} ) @ Load all regs saved previously
724 THUMB( ldr sp, [ip], #4 )
725 THUMB( ldr pc, [ip] )
734 * Each segment is 32-byte aligned and will be moved to the top of the high
735 * vector page. New segments (if ever needed) must be added in front of
736 * existing ones. This mechanism should be used only for things that are
737 * really small and justified, and not be abused freely.
739 * See Documentation/arm/kernel_user_helpers.txt for formal definitions.
744 #ifdef CONFIG_ARM_THUMB
751 .macro kuser_pad, sym, size
753 .rept 4 - (. - \sym) & 3
757 .rept (\size - (. - \sym)) / 4
762 #ifdef CONFIG_KUSER_HELPERS
764 .globl __kuser_helper_start
765 __kuser_helper_start:
768 * Due to the length of some sequences, __kuser_cmpxchg64 spans 2 regular
769 * kuser "slots", therefore 0xffff0f80 is not used as a valid entry point.
772 __kuser_cmpxchg64: @ 0xffff0f60
774 #if defined(CONFIG_NEEDS_SYSCALL_FOR_CMPXCHG)
777 * Poor you. No fast solution possible...
778 * The kernel itself must perform the operation.
779 * A special ghost syscall is used for that (see traps.c).
782 ldr r7, 1f @ it's 20 bits
783 swi __ARM_NR_cmpxchg64
785 1: .word __ARM_NR_cmpxchg64
787 #elif defined(CONFIG_CPU_32v6K)
789 stmfd sp!, {r4, r5, r6, r7}
790 ldrd r4, r5, [r0] @ load old val
791 ldrd r6, r7, [r1] @ load new val
793 1: ldrexd r0, r1, [r2] @ load current val
794 eors r3, r0, r4 @ compare with oldval (1)
795 eoreqs r3, r1, r5 @ compare with oldval (2)
796 strexdeq r3, r6, r7, [r2] @ store newval if eq
797 teqeq r3, #1 @ success?
798 beq 1b @ if no then retry
800 rsbs r0, r3, #0 @ set returned val and C flag
801 ldmfd sp!, {r4, r5, r6, r7}
804 #elif !defined(CONFIG_SMP)
809 * The only thing that can break atomicity in this cmpxchg64
810 * implementation is either an IRQ or a data abort exception
811 * causing another process/thread to be scheduled in the middle of
812 * the critical sequence. The same strategy as for cmpxchg is used.
814 stmfd sp!, {r4, r5, r6, lr}
815 ldmia r0, {r4, r5} @ load old val
816 ldmia r1, {r6, lr} @ load new val
817 1: ldmia r2, {r0, r1} @ load current val
818 eors r3, r0, r4 @ compare with oldval (1)
819 eoreqs r3, r1, r5 @ compare with oldval (2)
820 2: stmeqia r2, {r6, lr} @ store newval if eq
821 rsbs r0, r3, #0 @ set return val and C flag
822 ldmfd sp!, {r4, r5, r6, pc}
825 kuser_cmpxchg64_fixup:
826 @ Called from kuser_cmpxchg_fixup.
827 @ r4 = address of interrupted insn (must be preserved).
828 @ sp = saved regs. r7 and r8 are clobbered.
829 @ 1b = first critical insn, 2b = last critical insn.
830 @ If r4 >= 1b and r4 <= 2b then saved pc_usr is set to 1b.
832 sub r7, r7, #(0xffff0fff - (0xffff0f60 + (1b - __kuser_cmpxchg64)))
834 rsbcss r8, r8, #(2b - 1b)
835 strcs r7, [sp, #S_PC]
836 #if __LINUX_ARM_ARCH__ < 6
837 bcc kuser_cmpxchg32_fixup
843 #warning "NPTL on non MMU needs fixing"
850 #error "incoherent kernel configuration"
853 kuser_pad __kuser_cmpxchg64, 64
855 __kuser_memory_barrier: @ 0xffff0fa0
859 kuser_pad __kuser_memory_barrier, 32
861 __kuser_cmpxchg: @ 0xffff0fc0
863 #if defined(CONFIG_NEEDS_SYSCALL_FOR_CMPXCHG)
866 * Poor you. No fast solution possible...
867 * The kernel itself must perform the operation.
868 * A special ghost syscall is used for that (see traps.c).
871 ldr r7, 1f @ it's 20 bits
874 1: .word __ARM_NR_cmpxchg
876 #elif __LINUX_ARM_ARCH__ < 6
881 * The only thing that can break atomicity in this cmpxchg
882 * implementation is either an IRQ or a data abort exception
883 * causing another process/thread to be scheduled in the middle
884 * of the critical sequence. To prevent this, code is added to
885 * the IRQ and data abort exception handlers to set the pc back
886 * to the beginning of the critical section if it is found to be
887 * within that critical section (see kuser_cmpxchg_fixup).
889 1: ldr r3, [r2] @ load current val
890 subs r3, r3, r0 @ compare with oldval
891 2: streq r1, [r2] @ store newval if eq
892 rsbs r0, r3, #0 @ set return val and C flag
896 kuser_cmpxchg32_fixup:
897 @ Called from kuser_cmpxchg_check macro.
898 @ r4 = address of interrupted insn (must be preserved).
899 @ sp = saved regs. r7 and r8 are clobbered.
900 @ 1b = first critical insn, 2b = last critical insn.
901 @ If r4 >= 1b and r4 <= 2b then saved pc_usr is set to 1b.
903 sub r7, r7, #(0xffff0fff - (0xffff0fc0 + (1b - __kuser_cmpxchg)))
905 rsbcss r8, r8, #(2b - 1b)
906 strcs r7, [sp, #S_PC]
911 #warning "NPTL on non MMU needs fixing"
926 /* beware -- each __kuser slot must be 8 instructions max */
927 ALT_SMP(b __kuser_memory_barrier)
932 kuser_pad __kuser_cmpxchg, 32
934 __kuser_get_tls: @ 0xffff0fe0
935 ldr r0, [pc, #(16 - 8)] @ read TLS, set in kuser_get_tls_init
937 mrc p15, 0, r0, c13, c0, 3 @ 0xffff0fe8 hardware TLS code
938 kuser_pad __kuser_get_tls, 16
940 .word 0 @ 0xffff0ff0 software TLS value, then
941 .endr @ pad up to __kuser_helper_version
943 __kuser_helper_version: @ 0xffff0ffc
944 .word ((__kuser_helper_end - __kuser_helper_start) >> 5)
946 .globl __kuser_helper_end
956 * This code is copied to 0xffff1000 so we can use branches in the
957 * vectors, rather than ldr's. Note that this code must not exceed
960 * Common stub entry macro:
961 * Enter in IRQ mode, spsr = SVC/USR CPSR, lr = SVC/USR PC
963 * SP points to a minimal amount of processor-private memory, the address
964 * of which is copied into r0 for the mode specific abort handler.
966 .macro vector_stub, name, mode, correction=0
971 sub lr, lr, #\correction
975 @ Save r0, lr_<exception> (parent PC) and spsr_<exception>
978 stmia sp, {r0, lr} @ save r0, lr
980 str lr, [sp, #8] @ save spsr
983 @ Prepare for SVC32 mode. IRQs remain disabled.
986 eor r0, r0, #(\mode ^ SVC_MODE | PSR_ISETSTATE)
990 @ the branch table must immediately follow this code
994 THUMB( ldr lr, [r0, lr, lsl #2] )
996 ARM( ldr lr, [pc, lr, lsl #2] )
997 movs pc, lr @ branch to handler in SVC mode
998 ENDPROC(vector_\name)
1001 @ handler addresses follow this label
1005 .section .stubs, "ax", %progbits
1007 @ This must be the first word
1011 ARM( swi SYS_ERROR0 )
1017 * Interrupt dispatcher
1019 vector_stub irq, IRQ_MODE, 4
1021 .long __irq_usr @ 0 (USR_26 / USR_32)
1022 .long __irq_invalid @ 1 (FIQ_26 / FIQ_32)
1023 .long __irq_invalid @ 2 (IRQ_26 / IRQ_32)
1024 .long __irq_svc @ 3 (SVC_26 / SVC_32)
1025 .long __irq_invalid @ 4
1026 .long __irq_invalid @ 5
1027 .long __irq_invalid @ 6
1028 .long __irq_invalid @ 7
1029 .long __irq_invalid @ 8
1030 .long __irq_invalid @ 9
1031 .long __irq_invalid @ a
1032 .long __irq_invalid @ b
1033 .long __irq_invalid @ c
1034 .long __irq_invalid @ d
1035 .long __irq_invalid @ e
1036 .long __irq_invalid @ f
1039 * Data abort dispatcher
1040 * Enter in ABT mode, spsr = USR CPSR, lr = USR PC
1042 vector_stub dabt, ABT_MODE, 8
1044 .long __dabt_usr @ 0 (USR_26 / USR_32)
1045 .long __dabt_invalid @ 1 (FIQ_26 / FIQ_32)
1046 .long __dabt_invalid @ 2 (IRQ_26 / IRQ_32)
1047 .long __dabt_svc @ 3 (SVC_26 / SVC_32)
1048 .long __dabt_invalid @ 4
1049 .long __dabt_invalid @ 5
1050 .long __dabt_invalid @ 6
1051 .long __dabt_invalid @ 7
1052 .long __dabt_invalid @ 8
1053 .long __dabt_invalid @ 9
1054 .long __dabt_invalid @ a
1055 .long __dabt_invalid @ b
1056 .long __dabt_invalid @ c
1057 .long __dabt_invalid @ d
1058 .long __dabt_invalid @ e
1059 .long __dabt_invalid @ f
1062 * Prefetch abort dispatcher
1063 * Enter in ABT mode, spsr = USR CPSR, lr = USR PC
1065 vector_stub pabt, ABT_MODE, 4
1067 .long __pabt_usr @ 0 (USR_26 / USR_32)
1068 .long __pabt_invalid @ 1 (FIQ_26 / FIQ_32)
1069 .long __pabt_invalid @ 2 (IRQ_26 / IRQ_32)
1070 .long __pabt_svc @ 3 (SVC_26 / SVC_32)
1071 .long __pabt_invalid @ 4
1072 .long __pabt_invalid @ 5
1073 .long __pabt_invalid @ 6
1074 .long __pabt_invalid @ 7
1075 .long __pabt_invalid @ 8
1076 .long __pabt_invalid @ 9
1077 .long __pabt_invalid @ a
1078 .long __pabt_invalid @ b
1079 .long __pabt_invalid @ c
1080 .long __pabt_invalid @ d
1081 .long __pabt_invalid @ e
1082 .long __pabt_invalid @ f
1085 * Undef instr entry dispatcher
1086 * Enter in UND mode, spsr = SVC/USR CPSR, lr = SVC/USR PC
1088 vector_stub und, UND_MODE
1090 .long __und_usr @ 0 (USR_26 / USR_32)
1091 .long __und_invalid @ 1 (FIQ_26 / FIQ_32)
1092 .long __und_invalid @ 2 (IRQ_26 / IRQ_32)
1093 .long __und_svc @ 3 (SVC_26 / SVC_32)
1094 .long __und_invalid @ 4
1095 .long __und_invalid @ 5
1096 .long __und_invalid @ 6
1097 .long __und_invalid @ 7
1098 .long __und_invalid @ 8
1099 .long __und_invalid @ 9
1100 .long __und_invalid @ a
1101 .long __und_invalid @ b
1102 .long __und_invalid @ c
1103 .long __und_invalid @ d
1104 .long __und_invalid @ e
1105 .long __und_invalid @ f
1109 /*=============================================================================
1110 * Address exception handler
1111 *-----------------------------------------------------------------------------
1112 * These aren't too critical.
1113 * (they're not supposed to happen, and won't happen in 32-bit data mode).
1119 /*=============================================================================
1121 *-----------------------------------------------------------------------------
1122 * Enter in FIQ mode, spsr = ANY CPSR, lr = ANY PC
1123 * MUST PRESERVE SVC SPSR, but need to switch to SVC mode to show our msg.
1124 * Basically to switch modes, we *HAVE* to clobber one register... brain
1125 * damage alert! I don't think that we can execute any code in here in any
1126 * other mode than FIQ... Ok you can switch to another mode, but you can't
1127 * get out of that mode without clobbering one register.
1132 .globl vector_fiq_offset
1133 .equ vector_fiq_offset, vector_fiq
1135 .section .vectors, "ax", %progbits
1139 W(ldr) pc, __vectors_start + 0x1000
1142 W(b) vector_addrexcptn
1149 .globl cr_no_alignment
1155 #ifdef CONFIG_MULTI_IRQ_HANDLER
1156 .globl handle_arch_irq