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>
27 #include <asm/system.h>
29 #include "entry-header.S"
30 #include <asm/entry-macro-multi.S>
36 #ifdef CONFIG_MULTI_IRQ_HANDLER
37 ldr r1, =handle_arch_irq
44 arch_irq_handler_default
49 @ PABORT handler takes pt_regs in r2, fault address in r4 and psr in r5
53 ldr pc, [ip, #PROCESSOR_PABT_FUNC]
62 @ Call the processor-specific abort handler:
65 @ r4 - aborted context pc
66 @ r5 - aborted context psr
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)
183 #ifdef CONFIG_TRACE_IRQFLAGS
184 bl trace_hardirqs_off
195 @ IRQs off again before pulling preserved data off the stack
199 #ifdef CONFIG_TRACE_IRQFLAGS
201 bleq trace_hardirqs_on
203 blne trace_hardirqs_off
205 svc_exit r5 @ return from exception
214 #ifdef CONFIG_PREEMPT
216 ldr r8, [tsk, #TI_PREEMPT] @ get preempt count
217 ldr r0, [tsk, #TI_FLAGS] @ get flags
218 teq r8, #0 @ if preempt count != 0
219 movne r0, #0 @ force flags to 0
220 tst r0, #_TIF_NEED_RESCHED
224 #ifdef CONFIG_TRACE_IRQFLAGS
225 @ The parent context IRQs must have been enabled to get here in
226 @ the first place, so there's no point checking the PSR I bit.
229 svc_exit r5 @ return from exception
235 #ifdef CONFIG_PREEMPT
238 1: bl preempt_schedule_irq @ irq en/disable is done inside
239 ldr r0, [tsk, #TI_FLAGS] @ get new tasks TI_FLAGS
240 tst r0, #_TIF_NEED_RESCHED
241 moveq pc, r8 @ go again
246 @ Correct the PC such that it is pointing at the instruction
247 @ which caused the fault. If the faulting instruction was ARM
248 @ the PC will be pointing at the next instruction, and have to
249 @ subtract 4. Otherwise, it is Thumb, and the PC will be
250 @ pointing at the second half of the Thumb instruction. We
251 @ have to subtract 2.
260 #ifdef CONFIG_KPROBES
261 @ If a kprobe is about to simulate a "stmdb sp..." instruction,
262 @ it obviously needs free stack space which then will belong to
269 @ call emulation code, which returns using r9 if it has emulated
270 @ the instruction, or the more conventional lr if we are to treat
271 @ this as a real undefined instruction
275 #ifndef CONFIG_THUMB2_KERNEL
279 ldrh r0, [r4, #-2] @ Thumb instruction at LR - 2
280 cmp r0, #0xe800 @ 32-bit instruction if xx >= 0
282 ldrh r9, [r4] @ bottom 16 bits
285 orr r0, r9, r0, lsl #16
287 adr r9, BSYM(__und_svc_finish)
291 mov r1, #4 @ PC correction to apply
293 mov r0, sp @ struct pt_regs *regs
297 @ IRQs off again before pulling preserved data off the stack
303 @ restore SPSR and restart the instruction
305 ldr r5, [sp, #S_PSR] @ Get SVC cpsr
306 #ifdef CONFIG_TRACE_IRQFLAGS
308 bleq trace_hardirqs_on
310 blne trace_hardirqs_off
312 svc_exit r5 @ return from exception
323 @ IRQs off again before pulling preserved data off the stack
327 #ifdef CONFIG_TRACE_IRQFLAGS
329 bleq trace_hardirqs_on
331 blne trace_hardirqs_off
333 svc_exit r5 @ return from exception
350 * EABI note: sp_svc is always 64-bit aligned here, so should S_FRAME_SIZE
353 #if defined(CONFIG_AEABI) && (__LINUX_ARM_ARCH__ >= 5) && (S_FRAME_SIZE & 7)
354 #error "sizeof(struct pt_regs) must be a multiple of 8"
359 UNWIND(.cantunwind ) @ don't unwind the user space
360 sub sp, sp, #S_FRAME_SIZE
361 ARM( stmib sp, {r1 - r12} )
362 THUMB( stmia sp, {r0 - r12} )
365 add r0, sp, #S_PC @ here for interlock avoidance
366 mov r6, #-1 @ "" "" "" ""
368 str r3, [sp] @ save the "real" r0 copied
369 @ from the exception stack
372 @ We are now ready to fill in the remaining blanks on the stack:
374 @ r4 - lr_<exception>, already fixed up for correct return/restart
375 @ r5 - spsr_<exception>
376 @ r6 - orig_r0 (see pt_regs definition in ptrace.h)
378 @ Also, separately save sp_usr and lr_usr
381 ARM( stmdb r0, {sp, lr}^ )
382 THUMB( store_user_sp_lr r0, r1, S_SP - S_PC )
385 @ Enable the alignment trap while in kernel mode
390 @ Clear FP to mark the first stack frame
394 #ifdef CONFIG_IRQSOFF_TRACER
395 bl trace_hardirqs_off
399 .macro kuser_cmpxchg_check
400 #if !defined(CONFIG_CPU_32v6K) && !defined(CONFIG_NEEDS_SYSCALL_FOR_CMPXCHG)
402 #warning "NPTL on non MMU needs fixing"
404 @ Make sure our user space atomic helper is restarted
405 @ if it was interrupted in a critical region. Here we
406 @ perform a quick test inline since it should be false
407 @ 99.9999% of the time. The rest is done out of line.
409 blhs kuser_cmpxchg64_fixup
431 b ret_to_user_from_irq
444 @ r2 = regs->ARM_pc, which is either 2 or 4 bytes ahead of the
445 @ faulting instruction depending on Thumb mode.
446 @ r3 = regs->ARM_cpsr
448 @ The emulation code returns using r9 if it has emulated the
449 @ instruction, or the more conventional lr if we are to treat
450 @ this as a real undefined instruction
452 adr r9, BSYM(ret_from_exception)
454 tst r3, #PSR_T_BIT @ Thumb mode?
456 sub r4, r2, #4 @ ARM instr at LR - 4
458 #ifdef CONFIG_CPU_ENDIAN_BE8
459 rev r0, r0 @ little endian instruction
461 @ r0 = 32-bit ARM instruction which caused the exception
462 @ r2 = PC value for the following instruction (:= regs->ARM_pc)
463 @ r4 = PC value for the faulting instruction
464 @ lr = 32-bit undefined instruction function
465 adr lr, BSYM(__und_usr_fault_32)
470 sub r4, r2, #2 @ First half of thumb instr at LR - 2
471 #if CONFIG_ARM_THUMB && __LINUX_ARM_ARCH__ >= 6 && CONFIG_CPU_V7
473 * Thumb-2 instruction handling. Note that because pre-v6 and >= v6 platforms
474 * can never be supported in a single kernel, this code is not applicable at
475 * all when __LINUX_ARM_ARCH__ < 6. This allows simplifying assumptions to be
476 * made about .arch directives.
478 #if __LINUX_ARM_ARCH__ < 7
479 /* If the target CPU may not be Thumb-2-capable, a run-time check is needed: */
480 #define NEED_CPU_ARCHITECTURE
481 ldr r5, .LCcpu_architecture
483 cmp r5, #CPU_ARCH_ARMv7
484 blo __und_usr_fault_16 @ 16bit undefined instruction
486 * The following code won't get run unless the running CPU really is v7, so
487 * coding round the lack of ldrht on older arches is pointless. Temporarily
488 * override the assembler target arch with the minimum required instead:
493 cmp r5, #0xe800 @ 32bit instruction if xx != 0
494 blo __und_usr_fault_16 @ 16bit undefined instruction
496 add r2, r2, #2 @ r2 is PC + 2, make it PC + 4
497 str r2, [sp, #S_PC] @ it's a 2x16bit instr, update
498 orr r0, r0, r5, lsl #16
499 adr lr, BSYM(__und_usr_fault_32)
500 @ r0 = the two 16-bit Thumb instructions which caused the exception
501 @ r2 = PC value for the following Thumb instruction (:= regs->ARM_pc)
502 @ r4 = PC value for the first 16-bit Thumb instruction
503 @ lr = 32bit undefined instruction function
505 #if __LINUX_ARM_ARCH__ < 7
506 /* If the target arch was overridden, change it back: */
507 #ifdef CONFIG_CPU_32v6K
512 #endif /* __LINUX_ARM_ARCH__ < 7 */
513 #else /* !(CONFIG_ARM_THUMB && __LINUX_ARM_ARCH__ >= 6 && CONFIG_CPU_V7) */
520 * The out of line fixup for the ldrt instructions above.
522 .pushsection .fixup, "ax"
525 .pushsection __ex_table,"a"
527 #if CONFIG_ARM_THUMB && __LINUX_ARM_ARCH__ >= 6 && CONFIG_CPU_V7
534 * Check whether the instruction is a co-processor instruction.
535 * If yes, we need to call the relevant co-processor handler.
537 * Note that we don't do a full check here for the co-processor
538 * instructions; all instructions with bit 27 set are well
539 * defined. The only instructions that should fault are the
540 * co-processor instructions. However, we have to watch out
541 * for the ARM6/ARM7 SWI bug.
543 * NEON is a special case that has to be handled here. Not all
544 * NEON instructions are co-processor instructions, so we have
545 * to make a special case of checking for them. Plus, there's
546 * five groups of them, so we have a table of mask/opcode pairs
547 * to check against, and if any match then we branch off into the
550 * Emulators may wish to make use of the following registers:
551 * r0 = instruction opcode (32-bit ARM or two 16-bit Thumb)
552 * r2 = PC value to resume execution after successful emulation
553 * r9 = normal "successful" return address
554 * r10 = this threads thread_info structure
555 * lr = unrecognised instruction return address
556 * IRQs disabled, FIQs enabled.
559 @ Fall-through from Thumb-2 __und_usr
562 adr r6, .LCneon_thumb_opcodes
567 adr r6, .LCneon_arm_opcodes
569 ldr r7, [r6], #4 @ mask value
570 cmp r7, #0 @ end mask?
573 ldr r7, [r6], #4 @ opcode bits matching in mask
574 cmp r8, r7 @ NEON instruction?
578 strb r7, [r10, #TI_USED_CP + 10] @ mark CP#10 as used
579 strb r7, [r10, #TI_USED_CP + 11] @ mark CP#11 as used
580 b do_vfp @ let VFP handler handle this
583 tst r0, #0x08000000 @ only CDP/CPRT/LDC/STC have bit 27
584 tstne r0, #0x04000000 @ bit 26 set on both ARM and Thumb-2
585 #if defined(CONFIG_CPU_ARM610) || defined(CONFIG_CPU_ARM710)
586 and r8, r0, #0x0f000000 @ mask out op-code bits
587 teqne r8, #0x0f000000 @ SWI (ARM6/7 bug)?
590 get_thread_info r10 @ get current thread
591 and r8, r0, #0x00000f00 @ mask out CP number
592 THUMB( lsr r8, r8, #8 )
594 add r6, r10, #TI_USED_CP
595 ARM( strb r7, [r6, r8, lsr #8] ) @ set appropriate used_cp[]
596 THUMB( strb r7, [r6, r8] ) @ set appropriate used_cp[]
598 @ Test if we need to give access to iWMMXt coprocessors
599 ldr r5, [r10, #TI_FLAGS]
600 rsbs r7, r8, #(1 << 8) @ CP 0 or 1 only
601 movcss r7, r5, lsr #(TIF_USING_IWMMXT + 1)
602 bcs iwmmxt_task_enable
604 ARM( add pc, pc, r8, lsr #6 )
605 THUMB( lsl r8, r8, #2 )
610 W(b) do_fpe @ CP#1 (FPE)
611 W(b) do_fpe @ CP#2 (FPE)
614 b crunch_task_enable @ CP#4 (MaverickCrunch)
615 b crunch_task_enable @ CP#5 (MaverickCrunch)
616 b crunch_task_enable @ CP#6 (MaverickCrunch)
626 W(b) do_vfp @ CP#10 (VFP)
627 W(b) do_vfp @ CP#11 (VFP)
629 movw_pc lr @ CP#10 (VFP)
630 movw_pc lr @ CP#11 (VFP)
634 movw_pc lr @ CP#14 (Debug)
635 movw_pc lr @ CP#15 (Control)
637 #ifdef NEED_CPU_ARCHITECTURE
640 .word __cpu_architecture
647 .word 0xfe000000 @ mask
648 .word 0xf2000000 @ opcode
650 .word 0xff100000 @ mask
651 .word 0xf4000000 @ opcode
653 .word 0x00000000 @ mask
654 .word 0x00000000 @ opcode
656 .LCneon_thumb_opcodes:
657 .word 0xef000000 @ mask
658 .word 0xef000000 @ opcode
660 .word 0xff100000 @ mask
661 .word 0xf9000000 @ opcode
663 .word 0x00000000 @ mask
664 .word 0x00000000 @ opcode
670 add r10, r10, #TI_FPSTATE @ r10 = workspace
671 ldr pc, [r4] @ Call FP module USR entry point
674 * The FP module is called with these registers set:
677 * r9 = normal "successful" return address
679 * lr = unrecognised FP instruction return address
698 adr lr, BSYM(ret_from_exception)
700 ENDPROC(__und_usr_fault_32)
701 ENDPROC(__und_usr_fault_16)
711 * This is the return code to user mode for abort handlers
713 ENTRY(ret_from_exception)
721 ENDPROC(ret_from_exception)
724 * Register switch for ARMv3 and ARMv4 processors
725 * r0 = previous task_struct, r1 = previous thread_info, r2 = next thread_info
726 * previous and next are guaranteed not to be the same.
731 add ip, r1, #TI_CPU_SAVE
732 ldr r3, [r2, #TI_TP_VALUE]
733 ARM( stmia ip!, {r4 - sl, fp, sp, lr} ) @ Store most regs on stack
734 THUMB( stmia ip!, {r4 - sl, fp} ) @ Store most regs on stack
735 THUMB( str sp, [ip], #4 )
736 THUMB( str lr, [ip], #4 )
737 #ifdef CONFIG_CPU_USE_DOMAINS
738 ldr r6, [r2, #TI_CPU_DOMAIN]
741 #if defined(CONFIG_CC_STACKPROTECTOR) && !defined(CONFIG_SMP)
742 ldr r7, [r2, #TI_TASK]
743 ldr r8, =__stack_chk_guard
744 ldr r7, [r7, #TSK_STACK_CANARY]
746 #ifdef CONFIG_CPU_USE_DOMAINS
747 mcr p15, 0, r6, c3, c0, 0 @ Set domain register
750 add r4, r2, #TI_CPU_SAVE
751 ldr r0, =thread_notify_head
752 mov r1, #THREAD_NOTIFY_SWITCH
753 bl atomic_notifier_call_chain
754 #if defined(CONFIG_CC_STACKPROTECTOR) && !defined(CONFIG_SMP)
759 ARM( ldmia r4, {r4 - sl, fp, sp, pc} ) @ Load all regs saved previously
760 THUMB( ldmia ip!, {r4 - sl, fp} ) @ Load all regs saved previously
761 THUMB( ldr sp, [ip], #4 )
762 THUMB( ldr pc, [ip] )
771 * Each segment is 32-byte aligned and will be moved to the top of the high
772 * vector page. New segments (if ever needed) must be added in front of
773 * existing ones. This mechanism should be used only for things that are
774 * really small and justified, and not be abused freely.
776 * See Documentation/arm/kernel_user_helpers.txt for formal definitions.
781 #ifdef CONFIG_ARM_THUMB
789 .globl __kuser_helper_start
790 __kuser_helper_start:
793 * Due to the length of some sequences, __kuser_cmpxchg64 spans 2 regular
794 * kuser "slots", therefore 0xffff0f80 is not used as a valid entry point.
797 __kuser_cmpxchg64: @ 0xffff0f60
799 #if defined(CONFIG_NEEDS_SYSCALL_FOR_CMPXCHG)
802 * Poor you. No fast solution possible...
803 * The kernel itself must perform the operation.
804 * A special ghost syscall is used for that (see traps.c).
807 ldr r7, 1f @ it's 20 bits
808 swi __ARM_NR_cmpxchg64
810 1: .word __ARM_NR_cmpxchg64
812 #elif defined(CONFIG_CPU_32v6K)
814 stmfd sp!, {r4, r5, r6, r7}
815 ldrd r4, r5, [r0] @ load old val
816 ldrd r6, r7, [r1] @ load new val
818 1: ldrexd r0, r1, [r2] @ load current val
819 eors r3, r0, r4 @ compare with oldval (1)
820 eoreqs r3, r1, r5 @ compare with oldval (2)
821 strexdeq r3, r6, r7, [r2] @ store newval if eq
822 teqeq r3, #1 @ success?
823 beq 1b @ if no then retry
825 rsbs r0, r3, #0 @ set returned val and C flag
826 ldmfd sp!, {r4, r5, r6, r7}
829 #elif !defined(CONFIG_SMP)
834 * The only thing that can break atomicity in this cmpxchg64
835 * implementation is either an IRQ or a data abort exception
836 * causing another process/thread to be scheduled in the middle of
837 * the critical sequence. The same strategy as for cmpxchg is used.
839 stmfd sp!, {r4, r5, r6, lr}
840 ldmia r0, {r4, r5} @ load old val
841 ldmia r1, {r6, lr} @ load new val
842 1: ldmia r2, {r0, r1} @ load current val
843 eors r3, r0, r4 @ compare with oldval (1)
844 eoreqs r3, r1, r5 @ compare with oldval (2)
845 2: stmeqia r2, {r6, lr} @ store newval if eq
846 rsbs r0, r3, #0 @ set return val and C flag
847 ldmfd sp!, {r4, r5, r6, pc}
850 kuser_cmpxchg64_fixup:
851 @ Called from kuser_cmpxchg_fixup.
852 @ r4 = address of interrupted insn (must be preserved).
853 @ sp = saved regs. r7 and r8 are clobbered.
854 @ 1b = first critical insn, 2b = last critical insn.
855 @ If r4 >= 1b and r4 <= 2b then saved pc_usr is set to 1b.
857 sub r7, r7, #(0xffff0fff - (0xffff0f60 + (1b - __kuser_cmpxchg64)))
859 rsbcss r8, r8, #(2b - 1b)
860 strcs r7, [sp, #S_PC]
861 #if __LINUX_ARM_ARCH__ < 6
862 bcc kuser_cmpxchg32_fixup
868 #warning "NPTL on non MMU needs fixing"
875 #error "incoherent kernel configuration"
878 /* pad to next slot */
879 .rept (16 - (. - __kuser_cmpxchg64)/4)
885 __kuser_memory_barrier: @ 0xffff0fa0
891 __kuser_cmpxchg: @ 0xffff0fc0
893 #if defined(CONFIG_NEEDS_SYSCALL_FOR_CMPXCHG)
896 * Poor you. No fast solution possible...
897 * The kernel itself must perform the operation.
898 * A special ghost syscall is used for that (see traps.c).
901 ldr r7, 1f @ it's 20 bits
904 1: .word __ARM_NR_cmpxchg
906 #elif __LINUX_ARM_ARCH__ < 6
911 * The only thing that can break atomicity in this cmpxchg
912 * implementation is either an IRQ or a data abort exception
913 * causing another process/thread to be scheduled in the middle
914 * of the critical sequence. To prevent this, code is added to
915 * the IRQ and data abort exception handlers to set the pc back
916 * to the beginning of the critical section if it is found to be
917 * within that critical section (see kuser_cmpxchg_fixup).
919 1: ldr r3, [r2] @ load current val
920 subs r3, r3, r0 @ compare with oldval
921 2: streq r1, [r2] @ store newval if eq
922 rsbs r0, r3, #0 @ set return val and C flag
926 kuser_cmpxchg32_fixup:
927 @ Called from kuser_cmpxchg_check macro.
928 @ r4 = address of interrupted insn (must be preserved).
929 @ sp = saved regs. r7 and r8 are clobbered.
930 @ 1b = first critical insn, 2b = last critical insn.
931 @ If r4 >= 1b and r4 <= 2b then saved pc_usr is set to 1b.
933 sub r7, r7, #(0xffff0fff - (0xffff0fc0 + (1b - __kuser_cmpxchg)))
935 rsbcss r8, r8, #(2b - 1b)
936 strcs r7, [sp, #S_PC]
941 #warning "NPTL on non MMU needs fixing"
956 /* beware -- each __kuser slot must be 8 instructions max */
957 ALT_SMP(b __kuser_memory_barrier)
964 __kuser_get_tls: @ 0xffff0fe0
965 ldr r0, [pc, #(16 - 8)] @ read TLS, set in kuser_get_tls_init
967 mrc p15, 0, r0, c13, c0, 3 @ 0xffff0fe8 hardware TLS code
969 .word 0 @ 0xffff0ff0 software TLS value, then
970 .endr @ pad up to __kuser_helper_version
972 __kuser_helper_version: @ 0xffff0ffc
973 .word ((__kuser_helper_end - __kuser_helper_start) >> 5)
975 .globl __kuser_helper_end
983 * This code is copied to 0xffff0200 so we can use branches in the
984 * vectors, rather than ldr's. Note that this code must not
985 * exceed 0x300 bytes.
987 * Common stub entry macro:
988 * Enter in IRQ mode, spsr = SVC/USR CPSR, lr = SVC/USR PC
990 * SP points to a minimal amount of processor-private memory, the address
991 * of which is copied into r0 for the mode specific abort handler.
993 .macro vector_stub, name, mode, correction=0
998 sub lr, lr, #\correction
1002 @ Save r0, lr_<exception> (parent PC) and spsr_<exception>
1005 stmia sp, {r0, lr} @ save r0, lr
1007 str lr, [sp, #8] @ save spsr
1010 @ Prepare for SVC32 mode. IRQs remain disabled.
1013 eor r0, r0, #(\mode ^ SVC_MODE | PSR_ISETSTATE)
1017 @ the branch table must immediately follow this code
1021 THUMB( ldr lr, [r0, lr, lsl #2] )
1023 ARM( ldr lr, [pc, lr, lsl #2] )
1024 movs pc, lr @ branch to handler in SVC mode
1025 ENDPROC(vector_\name)
1028 @ handler addresses follow this label
1032 .globl __stubs_start
1035 * Interrupt dispatcher
1037 vector_stub irq, IRQ_MODE, 4
1039 .long __irq_usr @ 0 (USR_26 / USR_32)
1040 .long __irq_invalid @ 1 (FIQ_26 / FIQ_32)
1041 .long __irq_invalid @ 2 (IRQ_26 / IRQ_32)
1042 .long __irq_svc @ 3 (SVC_26 / SVC_32)
1043 .long __irq_invalid @ 4
1044 .long __irq_invalid @ 5
1045 .long __irq_invalid @ 6
1046 .long __irq_invalid @ 7
1047 .long __irq_invalid @ 8
1048 .long __irq_invalid @ 9
1049 .long __irq_invalid @ a
1050 .long __irq_invalid @ b
1051 .long __irq_invalid @ c
1052 .long __irq_invalid @ d
1053 .long __irq_invalid @ e
1054 .long __irq_invalid @ f
1057 * Data abort dispatcher
1058 * Enter in ABT mode, spsr = USR CPSR, lr = USR PC
1060 vector_stub dabt, ABT_MODE, 8
1062 .long __dabt_usr @ 0 (USR_26 / USR_32)
1063 .long __dabt_invalid @ 1 (FIQ_26 / FIQ_32)
1064 .long __dabt_invalid @ 2 (IRQ_26 / IRQ_32)
1065 .long __dabt_svc @ 3 (SVC_26 / SVC_32)
1066 .long __dabt_invalid @ 4
1067 .long __dabt_invalid @ 5
1068 .long __dabt_invalid @ 6
1069 .long __dabt_invalid @ 7
1070 .long __dabt_invalid @ 8
1071 .long __dabt_invalid @ 9
1072 .long __dabt_invalid @ a
1073 .long __dabt_invalid @ b
1074 .long __dabt_invalid @ c
1075 .long __dabt_invalid @ d
1076 .long __dabt_invalid @ e
1077 .long __dabt_invalid @ f
1080 * Prefetch abort dispatcher
1081 * Enter in ABT mode, spsr = USR CPSR, lr = USR PC
1083 vector_stub pabt, ABT_MODE, 4
1085 .long __pabt_usr @ 0 (USR_26 / USR_32)
1086 .long __pabt_invalid @ 1 (FIQ_26 / FIQ_32)
1087 .long __pabt_invalid @ 2 (IRQ_26 / IRQ_32)
1088 .long __pabt_svc @ 3 (SVC_26 / SVC_32)
1089 .long __pabt_invalid @ 4
1090 .long __pabt_invalid @ 5
1091 .long __pabt_invalid @ 6
1092 .long __pabt_invalid @ 7
1093 .long __pabt_invalid @ 8
1094 .long __pabt_invalid @ 9
1095 .long __pabt_invalid @ a
1096 .long __pabt_invalid @ b
1097 .long __pabt_invalid @ c
1098 .long __pabt_invalid @ d
1099 .long __pabt_invalid @ e
1100 .long __pabt_invalid @ f
1103 * Undef instr entry dispatcher
1104 * Enter in UND mode, spsr = SVC/USR CPSR, lr = SVC/USR PC
1106 vector_stub und, UND_MODE
1108 .long __und_usr @ 0 (USR_26 / USR_32)
1109 .long __und_invalid @ 1 (FIQ_26 / FIQ_32)
1110 .long __und_invalid @ 2 (IRQ_26 / IRQ_32)
1111 .long __und_svc @ 3 (SVC_26 / SVC_32)
1112 .long __und_invalid @ 4
1113 .long __und_invalid @ 5
1114 .long __und_invalid @ 6
1115 .long __und_invalid @ 7
1116 .long __und_invalid @ 8
1117 .long __und_invalid @ 9
1118 .long __und_invalid @ a
1119 .long __und_invalid @ b
1120 .long __und_invalid @ c
1121 .long __und_invalid @ d
1122 .long __und_invalid @ e
1123 .long __und_invalid @ f
1127 /*=============================================================================
1129 *-----------------------------------------------------------------------------
1130 * Enter in FIQ mode, spsr = ANY CPSR, lr = ANY PC
1131 * MUST PRESERVE SVC SPSR, but need to switch to SVC mode to show our msg.
1132 * Basically to switch modes, we *HAVE* to clobber one register... brain
1133 * damage alert! I don't think that we can execute any code in here in any
1134 * other mode than FIQ... Ok you can switch to another mode, but you can't
1135 * get out of that mode without clobbering one register.
1141 /*=============================================================================
1142 * Address exception handler
1143 *-----------------------------------------------------------------------------
1144 * These aren't too critical.
1145 * (they're not supposed to happen, and won't happen in 32-bit data mode).
1152 * We group all the following data together to optimise
1153 * for CPUs with separate I & D caches.
1163 .equ stubs_offset, __vectors_start + 0x200 - __stubs_start
1165 .globl __vectors_start
1167 ARM( swi SYS_ERROR0 )
1170 W(b) vector_und + stubs_offset
1171 W(ldr) pc, .LCvswi + stubs_offset
1172 W(b) vector_pabt + stubs_offset
1173 W(b) vector_dabt + stubs_offset
1174 W(b) vector_addrexcptn + stubs_offset
1175 W(b) vector_irq + stubs_offset
1176 W(b) vector_fiq + stubs_offset
1178 .globl __vectors_end
1184 .globl cr_no_alignment
1190 #ifdef CONFIG_MULTI_IRQ_HANDLER
1191 .globl handle_arch_irq