| /* $Id: entry.S,v 1.28 2005/06/20 05:06:30 starvik Exp $ |
| * |
| * linux/arch/cris/entry.S |
| * |
| * Copyright (C) 2000, 2001, 2002 Axis Communications AB |
| * |
| * Authors: Bjorn Wesen (bjornw@axis.com) |
| * |
| * $Log: entry.S,v $ |
| * Revision 1.28 2005/06/20 05:06:30 starvik |
| * Remove unnecessary diff to kernel.org tree |
| * |
| * Revision 1.27 2005/03/04 08:16:16 starvik |
| * Merge of Linux 2.6.11. |
| * |
| * Revision 1.26 2005/01/11 13:49:47 starvik |
| * Added NMI handler. |
| * |
| * Revision 1.25 2004/12/27 11:18:32 starvik |
| * Merge of Linux 2.6.10 (not functional yet). |
| * |
| * Revision 1.24 2004/12/22 10:41:23 starvik |
| * Updates to make v10 compile with the latest SMP aware generic code (even |
| * though v10 will never have SMP). |
| * |
| * Revision 1.23 2004/10/19 13:07:37 starvik |
| * Merge of Linux 2.6.9 |
| * |
| * Revision 1.22 2004/06/21 10:29:55 starvik |
| * Merge of Linux 2.6.7 |
| * |
| * Revision 1.21 2004/06/09 05:30:27 starvik |
| * Clean up multiple interrupt handling. |
| * Prevent interrupts from interrupting each other. |
| * Handle all active interrupts. |
| * |
| * Revision 1.20 2004/06/08 08:55:32 starvik |
| * Removed unused code |
| * |
| * Revision 1.19 2004/06/04 11:56:15 starvik |
| * Implemented page table lookup for refills in assembler for improved performance. |
| * |
| * Revision 1.18 2004/05/11 12:28:25 starvik |
| * Merge of Linux 2.6.6 |
| * |
| * Revision 1.17 2003/09/11 07:29:49 starvik |
| * Merge of Linux 2.6.0-test5 |
| * |
| * Revision 1.16 2003/07/04 08:27:41 starvik |
| * Merge of Linux 2.5.74 |
| * |
| * Revision 1.15 2003/04/09 07:32:55 starvik |
| * resume should return task_struct, not thread_info |
| * |
| * Revision 1.14 2003/04/09 05:20:44 starvik |
| * Merge of Linux 2.5.67 |
| * |
| * Revision 1.13 2002/12/11 15:42:02 starvik |
| * Extracted v10 (ETRAX 100LX) specific stuff from arch/cris/kernel/*.c |
| * |
| * Revision 1.12 2002/12/10 09:00:10 starvik |
| * Merge of Linux 2.5.51 |
| * |
| * Revision 1.11 2002/12/05 07:53:10 starvik |
| * Corrected constants used with btstq |
| * |
| * Revision 1.10 2002/11/27 08:45:10 starvik |
| * pid is in task_struct, not thread_info |
| * |
| * Revision 1.9 2002/11/26 09:52:05 starvik |
| * Added preemptive kernel scheduling (if CONFIG_PREEMPT) |
| * |
| * Revision 1.8 2002/11/20 11:56:11 starvik |
| * Merge of Linux 2.5.48 |
| * |
| * Revision 1.7 2002/11/18 13:02:42 starvik |
| * Added fourth parameter to do_notify_resume |
| * Minor cleanup |
| * |
| * Revision 1.6 2002/11/11 10:37:50 starvik |
| * Use new asm-offset defines |
| * Modified for new location of current->work etc |
| * Removed SYMBOL_NAME from syscalls |
| * Added some new syscalls |
| * |
| * Revision 1.5 2002/11/05 06:45:11 starvik |
| * Merge of Linux 2.5.45 |
| * |
| * Revision 1.4 2002/02/05 15:41:31 bjornw |
| * Rewritten to conform better to current 2.5 code (similar to arch/i386) |
| * |
| * Revision 1.3 2002/01/21 15:22:20 bjornw |
| * NICE_DOGGY fix from 2.4 arch/cris |
| * |
| * Revision 1.37 2001/12/07 17:03:55 bjornw |
| * Call a c-hook called watchdog_bite_hook instead of show_registers directly |
| * |
| * Revision 1.36 2001/11/22 13:36:36 bjornw |
| * * In ret_from_intr, check regs->dccr for usermode reentrance instead of |
| * DCCR explicitly (because the latter might not reflect current reality) |
| * * In mmu_bus_fault, set $r9 _after_ calling the C-code instead of before |
| * since $r9 is call-clobbered and is potentially needed afterwards |
| * |
| * Revision 1.35 2001/10/30 17:10:15 bjornw |
| * Add some syscalls |
| * |
| * Revision 1.34 2001/10/01 14:45:03 bjornw |
| * Removed underscores and added register prefixes |
| * |
| * Revision 1.33 2001/08/21 13:48:01 jonashg |
| * Added fix by HP to avoid oops when doing a hard_reset_now. |
| * |
| * Revision 1.32 2001/08/14 04:32:02 hp |
| * In _resume, add comment why R9 is saved; don't sound like it's call-saved. |
| * |
| * Revision 1.31 2001/07/25 16:07:42 bjornw |
| * softirq_active/mask -> softirq_pending only |
| * |
| * Revision 1.30 2001/07/05 01:03:32 hp |
| * - include asm/errno.h to get ENOSYS. |
| * - Use ENOSYS, not local constant LENOSYS; tweak comments. |
| * - Explain why .include, not #include is used. |
| * - Make oops-register-dump if watchdog bits and it's not expected. |
| * - Don't jsr, use jump _hard_reset_now, and skip spurious nop. |
| * - Use correct section attribute for section .rodata. |
| * - Adjust sys_ni_syscall fill number. |
| * |
| * Revision 1.29 2001/06/25 14:07:00 hp |
| * Fix review comment. |
| * * head.S: Use IO_STATE, IO_FIELD and IO_MASK constructs instead of |
| * magic numbers. Add comment that -traditional must not be used. |
| * * entry.S (SYMBOL_NAME): Change redefinition to use ## concatenation. |
| * Correct and update comment. |
| * * Makefile (.S.o): Don't use -traditional. Add comment why the |
| * toplevel rule can't be used (now that there's a reason). |
| * |
| * Revision 1.28 2001/06/21 02:00:40 hp |
| * * entry.S: Include asm/unistd.h. |
| * (_sys_call_table): Use section .rodata, not .data. |
| * (_kernel_thread): Move from... |
| * * process.c: ... here. |
| * * entryoffsets.c (VAL): Break out from... |
| * (OF): Use VAL. |
| * (LCLONE_VM): New asmified value from CLONE_VM. |
| * |
| * Revision 1.27 2001/05/29 11:25:27 markusl |
| * In case of "spurious_interrupt", do hard_reset instead of hanging system in a loop... |
| * |
| * Revision 1.26 2001/05/15 15:46:03 bjornw |
| * Include config.h now that we use some CONFIG_ options |
| * |
| * Revision 1.25 2001/05/15 05:38:47 hp |
| * Tweaked code in _ret_from_sys_call |
| * |
| * Revision 1.24 2001/05/15 05:27:49 hp |
| * Save r9 in r1 over function call rather than on stack. |
| * |
| * Revision 1.23 2001/05/15 05:10:00 hp |
| * Generate entry.S structure offsets from C |
| * |
| * Revision 1.22 2001/04/17 13:58:39 orjanf |
| * * Renamed CONFIG_KGDB to CONFIG_ETRAX_KGDB. |
| * |
| * Revision 1.21 2001/04/17 11:33:29 orjanf |
| * Updated according to review: |
| * * Included asm/sv_addr_ag.h to get macro for internal register. |
| * * Corrected comment regarding system call argument passing. |
| * * Removed comment about instruction being in a delay slot. |
| * * Added comment about SYMBOL_NAME macro. |
| * |
| * Revision 1.20 2001/04/12 08:51:07 hp |
| * - Add entry for sys_fcntl64. In fact copy last piece from i386 including ... |
| * - .rept to fill table to safe state with sys_ni_syscall. |
| * |
| * Revision 1.19 2001/04/04 09:43:32 orjanf |
| * * Moved do_sigtrap from traps.c to entry.S. |
| * * LTASK_PID need not be global anymore. |
| * |
| * Revision 1.18 2001/03/26 09:25:02 markusl |
| * Updated after review, should now handle USB interrupts correctly. |
| * |
| * Revision 1.17 2001/03/21 16:12:55 bjornw |
| * * Always make room for the cpu status record in the frame, in order to |
| * use the same framelength and layout for both mmu busfaults and normal |
| * irqs. No need to check for the explicit CRIS_FRAME_FIXUP type anymore. |
| * * Fixed bug with using addq for popping the stack in the epilogue - it |
| * destroyed the flag register. Use instructions that don't affect the |
| * flag register instead. |
| * * Removed write to R_PORT_PA_DATA during spurious_interrupt |
| * |
| * Revision 1.16 2001/03/20 19:43:02 bjornw |
| * * Get rid of esp0 setting |
| * * Give a 7th argument to a systemcall - the stackframe |
| * |
| * Revision 1.15 2001/03/05 13:14:30 bjornw |
| * Spelling fix |
| * |
| * Revision 1.14 2001/02/23 08:36:36 perf |
| * New ABI; syscallnr=r9, arg5=mof, arg6=srp. |
| * Corrected tracesys call check. |
| * |
| * Revision 1.13 2001/02/15 08:40:55 perf |
| * H-P by way of perf; |
| * - (_system_call): Don't read system call function address into r1. |
| * - (RBFExit): There is no such thing as a null pop. Adjust sp by addq. |
| * - (_system_call): Don't use r10 and don't save and restore it. |
| * - (THREAD_ESP0): New constant. |
| * - (_system_call): Inline set_esp0. |
| * |
| * Revision 1.12 2001/01/31 17:56:25 orjanf |
| * Added definition of LTASK_PID and made it global. |
| * |
| * Revision 1.11 2001/01/10 21:13:29 bjornw |
| * SYMBOL_NAME is defined incorrectly for the compiler options we currently use |
| * |
| * Revision 1.10 2000/12/18 23:47:56 bjornw |
| * * Added syscall trace support (ptrace), completely untested of course |
| * * Removed redundant check for NULL entries in syscall_table |
| * |
| * Revision 1.9 2000/11/21 16:40:51 bjornw |
| * * New frame type used when an SBFS frame needs to be popped without |
| * actually restarting the instruction |
| * * Enable interrupts in signal_return (they did so in x86, I hope it's a good |
| * idea) |
| * |
| * Revision 1.8 2000/11/17 16:53:35 bjornw |
| * Added detection of frame-type in Rexit, so that mmu_bus_fault can |
| * use ret_from_intr in the return-path to check for signals (like SEGV) |
| * and other foul things that might have occurred during the fault. |
| * |
| * Revision 1.7 2000/10/06 15:04:28 bjornw |
| * Include mof in register savings |
| * |
| * Revision 1.6 2000/09/12 16:02:44 bjornw |
| * Linux-2.4.0-test7 derived updates |
| * |
| * Revision 1.5 2000/08/17 15:35:15 bjornw |
| * 2.4.0-test6 changed local_irq_count and friends API |
| * |
| * Revision 1.4 2000/08/02 13:59:30 bjornw |
| * Removed olduname and uname from the syscall list |
| * |
| * Revision 1.3 2000/07/31 13:32:58 bjornw |
| * * Export ret_from_intr |
| * * _resume updated (prev/last tjohejsan) |
| * * timer_interrupt obsolete |
| * * SIGSEGV detection in mmu_bus_fault temporarily disabled |
| * |
| * |
| */ |
| |
| /* |
| * entry.S contains the system-call and fault low-level handling routines. |
| * |
| * NOTE: This code handles signal-recognition, which happens every time |
| * after a timer-interrupt and after each system call. |
| * |
| * Stack layout in 'ret_from_system_call': |
| * ptrace needs to have all regs on the stack. |
| * if the order here is changed, it needs to be |
| * updated in fork.c:copy_process, signal.c:do_signal, |
| * ptrace.c and ptrace.h |
| * |
| */ |
| |
| #include <linux/linkage.h> |
| #include <linux/sys.h> |
| #include <asm/unistd.h> |
| #include <asm/arch/sv_addr_ag.h> |
| #include <asm/errno.h> |
| #include <asm/thread_info.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/page.h> |
| #include <asm/pgtable.h> |
| |
| ;; functions exported from this file |
| |
| .globl system_call |
| .globl ret_from_intr |
| .globl ret_from_fork |
| .globl resume |
| .globl multiple_interrupt |
| .globl hwbreakpoint |
| .globl IRQ1_interrupt |
| .globl spurious_interrupt |
| .globl hw_bp_trigs |
| .globl mmu_bus_fault |
| .globl do_sigtrap |
| .globl gdb_handle_breakpoint |
| .globl sys_call_table |
| |
| ;; below are various parts of system_call which are not in the fast-path |
| |
| #ifdef CONFIG_PREEMPT |
| ; Check if preemptive kernel scheduling should be done |
| _resume_kernel: |
| di |
| ; Load current task struct |
| movs.w -8192, $r0 ; THREAD_SIZE = 8192 |
| and.d $sp, $r0 |
| move.d [$r0+TI_preempt_count], $r10 ; Preemption disabled? |
| bne _Rexit |
| nop |
| _need_resched: |
| move.d [$r0+TI_flags], $r10 |
| btstq TIF_NEED_RESCHED, $r10 ; Check if need_resched is set |
| bpl _Rexit |
| nop |
| ; Ok, lets's do some preemptive kernel scheduling |
| jsr preempt_schedule_irq |
| ; Load new task struct |
| movs.w -8192, $r0 ; THREAD_SIZE = 8192 |
| and.d $sp, $r0 |
| ; One more time (with new task) |
| ba _need_resched |
| nop |
| #else |
| #define _resume_kernel _Rexit |
| #endif |
| |
| ; Called at exit from fork. schedule_tail must be called to drop |
| ; spinlock if CONFIG_PREEMPT |
| ret_from_fork: |
| jsr schedule_tail |
| ba ret_from_sys_call |
| nop |
| |
| ret_from_intr: |
| ;; check for resched if preemptive kernel or if we're going back to user-mode |
| ;; this test matches the user_regs(regs) macro |
| ;; we cannot simply test $dccr, because that does not necessarily |
| ;; reflect what mode we'll return into. |
| |
| move.d [$sp + PT_dccr], $r0; regs->dccr |
| btstq 8, $r0 ; U-flag |
| bpl _resume_kernel |
| ; Note that di below is in delay slot |
| |
| _resume_userspace: |
| di ; so need_resched and sigpending don't change |
| |
| movs.w -8192, $r0 ; THREAD_SIZE == 8192 |
| and.d $sp, $r0 |
| |
| move.d [$r0+TI_flags], $r10 ; current->work |
| and.d _TIF_WORK_MASK, $r10 ; is there any work to be done on return |
| bne _work_pending |
| nop |
| ba _Rexit |
| nop |
| |
| ;; The system_call is called by a BREAK instruction, which works like |
| ;; an interrupt call but it stores the return PC in BRP instead of IRP. |
| ;; Since we dont really want to have two epilogues (one for system calls |
| ;; and one for interrupts) we push the contents of BRP instead of IRP in the |
| ;; system call prologue, to make it look like an ordinary interrupt on the |
| ;; stackframe. |
| ;; |
| ;; Since we can't have system calls inside interrupts, it should not matter |
| ;; that we don't stack IRP. |
| ;; |
| ;; In r9 we have the wanted syscall number. Arguments come in r10,r11,r12,r13,mof,srp |
| ;; |
| ;; This function looks on the _surface_ like spaghetti programming, but it's |
| ;; really designed so that the fast-path does not force cache-loading of non-used |
| ;; instructions. Only the non-common cases cause the outlined code to run.. |
| |
| system_call: |
| ;; stack-frame similar to the irq heads, which is reversed in ret_from_sys_call |
| move $brp,[$sp=$sp-16]; instruction pointer and room for a fake SBFS frame |
| push $srp |
| push $dccr |
| push $mof |
| subq 14*4, $sp ; make room for r0-r13 |
| movem $r13, [$sp] ; push r0-r13 |
| push $r10 ; push orig_r10 |
| clear.d [$sp=$sp-4] ; frametype == 0, normal stackframe |
| |
| movs.w -ENOSYS, $r0 |
| move.d $r0, [$sp+PT_r10] ; put the default return value in r10 in the frame |
| |
| ;; check if this process is syscall-traced |
| |
| movs.w -8192, $r0 ; THREAD_SIZE == 8192 |
| and.d $sp, $r0 |
| |
| move.d [$r0+TI_flags], $r0 |
| btstq TIF_SYSCALL_TRACE, $r0 |
| bmi _syscall_trace_entry |
| nop |
| |
| _syscall_traced: |
| |
| ;; check for sanity in the requested syscall number |
| |
| cmpu.w NR_syscalls, $r9 |
| bcc ret_from_sys_call |
| lslq 2, $r9 ; multiply by 4, in the delay slot |
| |
| ;; as a bonus 7th parameter, we give the location on the stack |
| ;; of the register structure itself. some syscalls need this. |
| |
| push $sp |
| |
| ;; the parameter carrying registers r10, r11, r12 and 13 are intact. |
| ;; the fifth and sixth parameters (if any) was in mof and srp |
| ;; respectively, and we need to put them on the stack. |
| |
| push $srp |
| push $mof |
| |
| jsr [$r9+sys_call_table] ; actually do the system call |
| addq 3*4, $sp ; pop the mof, srp and regs parameters |
| move.d $r10, [$sp+PT_r10] ; save the return value |
| |
| moveq 1, $r9 ; "parameter" to ret_from_sys_call to show it was a sys call |
| |
| ;; fall through into ret_from_sys_call to return |
| |
| ret_from_sys_call: |
| ;; r9 is a parameter - if >=1 we came from a syscall, if 0, from an irq |
| |
| ;; get the current task-struct pointer (see top for defs) |
| |
| movs.w -8192, $r0 ; THREAD_SIZE == 8192 |
| and.d $sp, $r0 |
| |
| di ; make sure need_resched and sigpending don't change |
| move.d [$r0+TI_flags],$r1 |
| and.d _TIF_ALLWORK_MASK, $r1 |
| bne _syscall_exit_work |
| nop |
| |
| _Rexit: |
| ;; this epilogue MUST match the prologues in multiple_interrupt, irq.h and ptregs.h |
| pop $r10 ; frametype |
| bne _RBFexit ; was not CRIS_FRAME_NORMAL, handle otherwise |
| addq 4, $sp ; skip orig_r10, in delayslot |
| movem [$sp+], $r13 ; registers r0-r13 |
| pop $mof ; multiply overflow register |
| pop $dccr ; condition codes |
| pop $srp ; subroutine return pointer |
| ;; now we have a 4-word SBFS frame which we do not want to restore |
| ;; using RBF since it was not stacked with SBFS. instead we would like to |
| ;; just get the PC value to restart it with, and skip the rest of |
| ;; the frame. |
| ;; Also notice that it's important to use instructions here that |
| ;; keep the interrupts disabled (since we've already popped DCCR) |
| move [$sp=$sp+16], $p8; pop the SBFS frame from the sp |
| jmpu [$sp-16] ; return through the irp field in the sbfs frame |
| |
| _RBFexit: |
| movem [$sp+], $r13 ; registers r0-r13, in delay slot |
| pop $mof ; multiply overflow register |
| pop $dccr ; condition codes |
| pop $srp ; subroutine return pointer |
| rbf [$sp+] ; return by popping the CPU status |
| |
| ;; We get here after doing a syscall if extra work might need to be done |
| ;; perform syscall exit tracing if needed |
| |
| _syscall_exit_work: |
| ;; $r0 contains current at this point and irq's are disabled |
| |
| move.d [$r0+TI_flags], $r1 |
| btstq TIF_SYSCALL_TRACE, $r1 |
| bpl _work_pending |
| nop |
| |
| ei |
| |
| move.d $r9, $r1 ; preserve r9 |
| jsr do_syscall_trace |
| move.d $r1, $r9 |
| |
| ba _resume_userspace |
| nop |
| |
| _work_pending: |
| move.d [$r0+TI_flags], $r1 |
| btstq TIF_NEED_RESCHED, $r1 |
| bpl _work_notifysig ; was neither trace nor sched, must be signal/notify |
| nop |
| |
| _work_resched: |
| move.d $r9, $r1 ; preserve r9 |
| jsr schedule |
| move.d $r1, $r9 |
| di |
| |
| move.d [$r0+TI_flags], $r1 |
| and.d _TIF_WORK_MASK, $r1; ignore the syscall trace counter |
| beq _Rexit |
| nop |
| btstq TIF_NEED_RESCHED, $r1 |
| bmi _work_resched ; current->work.need_resched |
| nop |
| |
| _work_notifysig: |
| ;; deal with pending signals and notify-resume requests |
| |
| move.d $r9, $r10 ; do_notify_resume syscall/irq param |
| move.d $sp, $r11 ; the regs param |
| move.d $r1, $r12 ; the thread_info_flags parameter |
| jsr do_notify_resume |
| |
| ba _Rexit |
| nop |
| |
| ;; We get here as a sidetrack when we've entered a syscall with the |
| ;; trace-bit set. We need to call do_syscall_trace and then continue |
| ;; with the call. |
| |
| _syscall_trace_entry: |
| ;; PT_r10 in the frame contains -ENOSYS as required, at this point |
| |
| jsr do_syscall_trace |
| |
| ;; now re-enter the syscall code to do the syscall itself |
| ;; we need to restore $r9 here to contain the wanted syscall, and |
| ;; the other parameter-bearing registers |
| |
| move.d [$sp+PT_r9], $r9 |
| move.d [$sp+PT_orig_r10], $r10 ; PT_r10 is already filled with -ENOSYS. |
| move.d [$sp+PT_r11], $r11 |
| move.d [$sp+PT_r12], $r12 |
| move.d [$sp+PT_r13], $r13 |
| move [$sp+PT_mof], $mof |
| move [$sp+PT_srp], $srp |
| |
| ba _syscall_traced |
| nop |
| |
| ;; resume performs the actual task-switching, by switching stack pointers |
| ;; input arguments: r10 = prev, r11 = next, r12 = thread offset in task struct |
| ;; returns old current in r10 |
| ;; |
| ;; TODO: see the i386 version. The switch_to which calls resume in our version |
| ;; could really be an inline asm of this. |
| |
| resume: |
| push $srp ; we keep the old/new PC on the stack |
| add.d $r12, $r10 ; r10 = current tasks tss |
| move $dccr, [$r10+THREAD_dccr]; save irq enable state |
| di |
| |
| move $usp, [$r10+ THREAD_usp] ; save user-mode stackpointer |
| |
| ;; See copy_thread for the reason why register R9 is saved. |
| subq 10*4, $sp |
| movem $r9, [$sp] ; save non-scratch registers and R9. |
| |
| move.d $sp, [$r10+THREAD_ksp] ; save the kernel stack pointer for the old task |
| move.d $sp, $r10 ; return last running task in r10 |
| and.d -8192, $r10 ; get thread_info from stackpointer |
| move.d [$r10+TI_task], $r10 ; get task |
| add.d $r12, $r11 ; find the new tasks tss |
| move.d [$r11+THREAD_ksp], $sp ; switch into the new stackframe by restoring kernel sp |
| |
| movem [$sp+], $r9 ; restore non-scratch registers and R9. |
| |
| move [$r11+THREAD_usp], $usp ; restore user-mode stackpointer |
| |
| move [$r11+THREAD_dccr], $dccr ; restore irq enable status |
| jump [$sp+] ; restore PC |
| |
| ;; This is the MMU bus fault handler. |
| ;; It needs to stack the CPU status and overall is different |
| ;; from the other interrupt handlers. |
| |
| mmu_bus_fault: |
| ;; For refills we try to do a quick page table lookup. If it is |
| ;; a real fault we let the mm subsystem handle it. |
| |
| ;; the first longword in the sbfs frame was the interrupted PC |
| ;; which fits nicely with the "IRP" slot in pt_regs normally used to |
| ;; contain the return address. used by Oops to print kernel errors. |
| sbfs [$sp=$sp-16] ; push the internal CPU status |
| push $dccr |
| di |
| subq 2*4, $sp |
| movem $r1, [$sp] |
| move.d [R_MMU_CAUSE], $r1 |
| ;; ETRAX 100LX TR89 bugfix: if the second half of an unaligned |
| ;; write causes a MMU-fault, it will not be restarted correctly. |
| ;; This could happen if a write crosses a page-boundary and the |
| ;; second page is not yet COW'ed or even loaded. The workaround |
| ;; is to clear the unaligned bit in the CPU status record, so |
| ;; that the CPU will rerun both the first and second halves of |
| ;; the instruction. This will not have any sideeffects unless |
| ;; the first half goes to any device or memory that can't be |
| ;; written twice, and which is mapped through the MMU. |
| ;; |
| ;; We only need to do this for writes. |
| btstq 8, $r1 ; Write access? |
| bpl 1f |
| nop |
| move.d [$sp+16], $r0 ; Clear unaligned bit in csrinstr |
| and.d ~(1<<5), $r0 |
| move.d $r0, [$sp+16] |
| 1: btstq 12, $r1 ; Refill? |
| bpl 2f |
| lsrq 24, $r1 ; Get PGD index (bit 24-31) |
| move.d [per_cpu__current_pgd], $r0 ; PGD for the current process |
| move.d [$r0+$r1.d], $r0 ; Get PMD |
| beq 2f |
| nop |
| and.w PAGE_MASK, $r0 ; Remove PMD flags |
| move.d [R_MMU_CAUSE], $r1 |
| lsrq PAGE_SHIFT, $r1 |
| and.d 0x7ff, $r1 ; Get PTE index into PGD (bit 13-23) |
| move.d [$r0+$r1.d], $r1 ; Get PTE |
| beq 2f |
| nop |
| ;; Store in TLB |
| move.d $r1, [R_TLB_LO] |
| ;; Return |
| movem [$sp+], $r1 |
| pop $dccr |
| rbf [$sp+] ; return by popping the CPU status |
| |
| 2: ; PMD or PTE missing, let the mm subsystem fix it up. |
| movem [$sp+], $r1 |
| pop $dccr |
| |
| ; Ok, not that easy, pass it on to the mm subsystem |
| ; The MMU status record is now on the stack |
| push $srp ; make a stackframe similar to pt_regs |
| push $dccr |
| push $mof |
| di |
| subq 14*4, $sp |
| movem $r13, [$sp] |
| push $r10 ; dummy orig_r10 |
| moveq 1, $r10 |
| push $r10 ; frametype == 1, BUSFAULT frame type |
| |
| move.d $sp, $r10 ; pt_regs argument to handle_mmu_bus_fault |
| |
| jsr handle_mmu_bus_fault ; in arch/cris/arch-v10/mm/fault.c |
| |
| ;; now we need to return through the normal path, we cannot just |
| ;; do the RBFexit since we might have killed off the running |
| ;; process due to a SEGV, scheduled due to a page blocking or |
| ;; whatever. |
| |
| moveq 0, $r9 ; busfault is equivalent to an irq |
| |
| ba ret_from_intr |
| nop |
| |
| ;; special handlers for breakpoint and NMI |
| hwbreakpoint: |
| push $dccr |
| di |
| push $r10 |
| push $r11 |
| move.d [hw_bp_trig_ptr],$r10 |
| move $brp,$r11 |
| move.d $r11,[$r10+] |
| move.d $r10,[hw_bp_trig_ptr] |
| 1: pop $r11 |
| pop $r10 |
| pop $dccr |
| retb |
| nop |
| |
| IRQ1_interrupt: |
| ;; this prologue MUST match the one in irq.h and the struct in ptregs.h!!! |
| move $brp,[$sp=$sp-16]; instruction pointer and room for a fake SBFS frame |
| push $srp |
| push $dccr |
| push $mof |
| di |
| subq 14*4, $sp |
| movem $r13, [$sp] |
| push $r10 ; push orig_r10 |
| clear.d [$sp=$sp-4] ; frametype == 0, normal frame |
| |
| ;; If there is a glitch on the NMI pin shorter than ~100ns |
| ;; (i.e. non-active by the time we get here) then the nmi_pin bit |
| ;; in R_IRQ_MASK0_RD will already be cleared. The watchdog_nmi bit |
| ;; is cleared by us however (when feeding the watchdog), which is why |
| ;; we use that bit to determine what brought us here. |
| |
| move.d [R_IRQ_MASK0_RD], $r1 ; External NMI or watchdog? |
| and.d (1<<30), $r1 |
| bne wdog |
| move.d $sp, $r10 |
| jsr handle_nmi |
| setf m ; Enable NMI again |
| ba _Rexit ; Return the standard way |
| nop |
| wdog: |
| #if defined(CONFIG_ETRAX_WATCHDOG) && !defined(CONFIG_SVINTO_SIM) |
| ;; Check if we're waiting for reset to happen, as signalled by |
| ;; hard_reset_now setting cause_of_death to a magic value. If so, just |
| ;; get stuck until reset happens. |
| .comm cause_of_death, 4 ;; Don't declare this anywhere. |
| move.d [cause_of_death], $r10 |
| cmp.d 0xbedead, $r10 |
| _killed_by_death: |
| beq _killed_by_death |
| nop |
| |
| ;; We'll see this in ksymoops dumps. |
| Watchdog_bite: |
| |
| #ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY |
| ;; We just restart the watchdog here to be sure we dont get |
| ;; hit while printing the watchdogmsg below |
| ;; This restart is compatible with the rest of the C-code, so |
| ;; the C-code can keep restarting the watchdog after this point. |
| ;; The non-NICE_DOGGY code below though, disables the possibility |
| ;; to restart since it changes the watchdog key, to avoid any |
| ;; buggy loops etc. keeping the watchdog alive after this. |
| jsr reset_watchdog |
| #else |
| |
| ;; We need to extend the 3.3ms after the NMI at watchdog bite, so we have |
| ;; time for an oops-dump over a 115k2 serial wire. Another 100ms should do. |
| |
| ;; Change the watchdog key to an arbitrary 3-bit value and restart the |
| ;; watchdog. |
| #define WD_INIT 2 |
| moveq IO_FIELD (R_WATCHDOG, key, WD_INIT), $r10 |
| move.d R_WATCHDOG, $r11 |
| |
| move.d $r10, [$r11] |
| moveq IO_FIELD (R_WATCHDOG, key, \ |
| IO_EXTRACT (R_WATCHDOG, key, \ |
| IO_MASK (R_WATCHDOG, key)) \ |
| ^ WD_INIT) \ |
| | IO_STATE (R_WATCHDOG, enable, start), $r10 |
| move.d $r10, [$r11] |
| |
| #endif |
| |
| ;; Note that we don't do "setf m" here (or after two necessary NOPs), |
| ;; since *not* doing that saves us from re-entrancy checks. We don't want |
| ;; to get here again due to possible subsequent NMIs; we want the watchdog |
| ;; to reset us. |
| |
| move.d _watchdogmsg,$r10 |
| jsr printk |
| |
| move.d $sp, $r10 |
| jsr watchdog_bite_hook |
| |
| ;; This nop is here so we see the "Watchdog_bite" label in ksymoops dumps |
| ;; rather than "spurious_interrupt". |
| nop |
| ;; At this point we drop down into spurious_interrupt, which will do a |
| ;; hard reset. |
| |
| .section .rodata,"a" |
| _watchdogmsg: |
| .ascii "Oops: bitten by watchdog\n\0" |
| .previous |
| |
| #endif /* CONFIG_ETRAX_WATCHDOG and not CONFIG_SVINTO_SIM */ |
| |
| spurious_interrupt: |
| di |
| jump hard_reset_now |
| |
| ;; this handles the case when multiple interrupts arrive at the same time |
| ;; we jump to the first set interrupt bit in a priority fashion |
| ;; the hardware will call the unserved interrupts after the handler finishes |
| |
| multiple_interrupt: |
| ;; this prologue MUST match the one in irq.h and the struct in ptregs.h!!! |
| move $irp,[$sp=$sp-16]; instruction pointer and room for a fake SBFS frame |
| push $srp |
| push $dccr |
| push $mof |
| di |
| subq 14*4, $sp |
| movem $r13, [$sp] |
| push $r10 ; push orig_r10 |
| clear.d [$sp=$sp-4] ; frametype == 0, normal frame |
| |
| move.d $sp, $r10 |
| jsr do_multiple_IRQ |
| |
| jump ret_from_intr |
| |
| do_sigtrap: |
| ;; |
| ;; SIGTRAP the process that executed the break instruction. |
| ;; Make a frame that Rexit in entry.S expects. |
| ;; |
| move $brp, [$sp=$sp-16] ; Push BRP while faking a cpu status record. |
| push $srp ; Push subroutine return pointer. |
| push $dccr ; Push condition codes. |
| push $mof ; Push multiply overflow reg. |
| di ; Need to disable irq's at this point. |
| subq 14*4, $sp ; Make room for r0-r13. |
| movem $r13, [$sp] ; Push the r0-r13 registers. |
| push $r10 ; Push orig_r10. |
| clear.d [$sp=$sp-4] ; Frametype - this is a normal stackframe. |
| |
| movs.w -8192,$r9 ; THREAD_SIZE == 8192 |
| and.d $sp, $r9 |
| move.d [$r9+TI_task], $r10 |
| move.d [$r10+TASK_pid], $r10 ; current->pid as arg1. |
| moveq 5, $r11 ; SIGTRAP as arg2. |
| jsr sys_kill |
| jump ret_from_intr ; Use the return routine for interrupts. |
| |
| gdb_handle_breakpoint: |
| push $dccr |
| push $r0 |
| #ifdef CONFIG_ETRAX_KGDB |
| move $dccr, $r0 ; U-flag not affected by previous insns. |
| btstq 8, $r0 ; Test the U-flag. |
| bmi _ugdb_handle_breakpoint ; Go to user mode debugging. |
| nop ; Empty delay slot (cannot pop r0 here). |
| pop $r0 ; Restore r0. |
| ba kgdb_handle_breakpoint ; Go to kernel debugging. |
| pop $dccr ; Restore dccr in delay slot. |
| #endif |
| |
| _ugdb_handle_breakpoint: |
| move $brp, $r0 ; Use r0 temporarily for calculation. |
| subq 2, $r0 ; Set to address of previous instruction. |
| move $r0, $brp |
| pop $r0 ; Restore r0. |
| ba do_sigtrap ; SIGTRAP the offending process. |
| pop $dccr ; Restore dccr in delay slot. |
| |
| .global kernel_execve |
| kernel_execve: |
| move.d __NR_execve, $r9 |
| break 13 |
| ret |
| nop |
| |
| .data |
| |
| hw_bp_trigs: |
| .space 64*4 |
| hw_bp_trig_ptr: |
| .dword hw_bp_trigs |
| |
| .section .rodata,"a" |
| sys_call_table: |
| .long sys_restart_syscall /* 0 - old "setup()" system call, used for restarting */ |
| .long sys_exit |
| .long sys_fork |
| .long sys_read |
| .long sys_write |
| .long sys_open /* 5 */ |
| .long sys_close |
| .long sys_waitpid |
| .long sys_creat |
| .long sys_link |
| .long sys_unlink /* 10 */ |
| .long sys_execve |
| .long sys_chdir |
| .long sys_time |
| .long sys_mknod |
| .long sys_chmod /* 15 */ |
| .long sys_lchown16 |
| .long sys_ni_syscall /* old break syscall holder */ |
| .long sys_stat |
| .long sys_lseek |
| .long sys_getpid /* 20 */ |
| .long sys_mount |
| .long sys_oldumount |
| .long sys_setuid16 |
| .long sys_getuid16 |
| .long sys_stime /* 25 */ |
| .long sys_ptrace |
| .long sys_alarm |
| .long sys_fstat |
| .long sys_pause |
| .long sys_utime /* 30 */ |
| .long sys_ni_syscall /* old stty syscall holder */ |
| .long sys_ni_syscall /* old gtty syscall holder */ |
| .long sys_access |
| .long sys_nice |
| .long sys_ni_syscall /* 35 old ftime syscall holder */ |
| .long sys_sync |
| .long sys_kill |
| .long sys_rename |
| .long sys_mkdir |
| .long sys_rmdir /* 40 */ |
| .long sys_dup |
| .long sys_pipe |
| .long sys_times |
| .long sys_ni_syscall /* old prof syscall holder */ |
| .long sys_brk /* 45 */ |
| .long sys_setgid16 |
| .long sys_getgid16 |
| .long sys_signal |
| .long sys_geteuid16 |
| .long sys_getegid16 /* 50 */ |
| .long sys_acct |
| .long sys_umount /* recycled never used phys( */ |
| .long sys_ni_syscall /* old lock syscall holder */ |
| .long sys_ioctl |
| .long sys_fcntl /* 55 */ |
| .long sys_ni_syscall /* old mpx syscall holder */ |
| .long sys_setpgid |
| .long sys_ni_syscall /* old ulimit syscall holder */ |
| .long sys_ni_syscall /* old sys_olduname holder */ |
| .long sys_umask /* 60 */ |
| .long sys_chroot |
| .long sys_ustat |
| .long sys_dup2 |
| .long sys_getppid |
| .long sys_getpgrp /* 65 */ |
| .long sys_setsid |
| .long sys_sigaction |
| .long sys_sgetmask |
| .long sys_ssetmask |
| .long sys_setreuid16 /* 70 */ |
| .long sys_setregid16 |
| .long sys_sigsuspend |
| .long sys_sigpending |
| .long sys_sethostname |
| .long sys_setrlimit /* 75 */ |
| .long sys_old_getrlimit |
| .long sys_getrusage |
| .long sys_gettimeofday |
| .long sys_settimeofday |
| .long sys_getgroups16 /* 80 */ |
| .long sys_setgroups16 |
| .long sys_select /* was old_select in Linux/E100 */ |
| .long sys_symlink |
| .long sys_lstat |
| .long sys_readlink /* 85 */ |
| .long sys_uselib |
| .long sys_swapon |
| .long sys_reboot |
| .long old_readdir |
| .long old_mmap /* 90 */ |
| .long sys_munmap |
| .long sys_truncate |
| .long sys_ftruncate |
| .long sys_fchmod |
| .long sys_fchown16 /* 95 */ |
| .long sys_getpriority |
| .long sys_setpriority |
| .long sys_ni_syscall /* old profil syscall holder */ |
| .long sys_statfs |
| .long sys_fstatfs /* 100 */ |
| .long sys_ni_syscall /* sys_ioperm in i386 */ |
| .long sys_socketcall |
| .long sys_syslog |
| .long sys_setitimer |
| .long sys_getitimer /* 105 */ |
| .long sys_newstat |
| .long sys_newlstat |
| .long sys_newfstat |
| .long sys_ni_syscall /* old sys_uname holder */ |
| .long sys_ni_syscall /* sys_iopl in i386 */ |
| .long sys_vhangup |
| .long sys_ni_syscall /* old "idle" system call */ |
| .long sys_ni_syscall /* vm86old in i386 */ |
| .long sys_wait4 |
| .long sys_swapoff /* 115 */ |
| .long sys_sysinfo |
| .long sys_ipc |
| .long sys_fsync |
| .long sys_sigreturn |
| .long sys_clone /* 120 */ |
| .long sys_setdomainname |
| .long sys_newuname |
| .long sys_ni_syscall /* sys_modify_ldt */ |
| .long sys_adjtimex |
| .long sys_mprotect /* 125 */ |
| .long sys_sigprocmask |
| .long sys_ni_syscall /* old "create_module" */ |
| .long sys_init_module |
| .long sys_delete_module |
| .long sys_ni_syscall /* 130: old "get_kernel_syms" */ |
| .long sys_quotactl |
| .long sys_getpgid |
| .long sys_fchdir |
| .long sys_bdflush |
| .long sys_sysfs /* 135 */ |
| .long sys_personality |
| .long sys_ni_syscall /* for afs_syscall */ |
| .long sys_setfsuid16 |
| .long sys_setfsgid16 |
| .long sys_llseek /* 140 */ |
| .long sys_getdents |
| .long sys_select |
| .long sys_flock |
| .long sys_msync |
| .long sys_readv /* 145 */ |
| .long sys_writev |
| .long sys_getsid |
| .long sys_fdatasync |
| .long sys_sysctl |
| .long sys_mlock /* 150 */ |
| .long sys_munlock |
| .long sys_mlockall |
| .long sys_munlockall |
| .long sys_sched_setparam |
| .long sys_sched_getparam /* 155 */ |
| .long sys_sched_setscheduler |
| .long sys_sched_getscheduler |
| .long sys_sched_yield |
| .long sys_sched_get_priority_max |
| .long sys_sched_get_priority_min /* 160 */ |
| .long sys_sched_rr_get_interval |
| .long sys_nanosleep |
| .long sys_mremap |
| .long sys_setresuid16 |
| .long sys_getresuid16 /* 165 */ |
| .long sys_ni_syscall /* sys_vm86 */ |
| .long sys_ni_syscall /* Old sys_query_module */ |
| .long sys_poll |
| .long sys_nfsservctl |
| .long sys_setresgid16 /* 170 */ |
| .long sys_getresgid16 |
| .long sys_prctl |
| .long sys_rt_sigreturn |
| .long sys_rt_sigaction |
| .long sys_rt_sigprocmask /* 175 */ |
| .long sys_rt_sigpending |
| .long sys_rt_sigtimedwait |
| .long sys_rt_sigqueueinfo |
| .long sys_rt_sigsuspend |
| .long sys_pread64 /* 180 */ |
| .long sys_pwrite64 |
| .long sys_chown16 |
| .long sys_getcwd |
| .long sys_capget |
| .long sys_capset /* 185 */ |
| .long sys_sigaltstack |
| .long sys_sendfile |
| .long sys_ni_syscall /* streams1 */ |
| .long sys_ni_syscall /* streams2 */ |
| .long sys_vfork /* 190 */ |
| .long sys_getrlimit |
| .long sys_mmap2 |
| .long sys_truncate64 |
| .long sys_ftruncate64 |
| .long sys_stat64 /* 195 */ |
| .long sys_lstat64 |
| .long sys_fstat64 |
| .long sys_lchown |
| .long sys_getuid |
| .long sys_getgid /* 200 */ |
| .long sys_geteuid |
| .long sys_getegid |
| .long sys_setreuid |
| .long sys_setregid |
| .long sys_getgroups /* 205 */ |
| .long sys_setgroups |
| .long sys_fchown |
| .long sys_setresuid |
| .long sys_getresuid |
| .long sys_setresgid /* 210 */ |
| .long sys_getresgid |
| .long sys_chown |
| .long sys_setuid |
| .long sys_setgid |
| .long sys_setfsuid /* 215 */ |
| .long sys_setfsgid |
| .long sys_pivot_root |
| .long sys_mincore |
| .long sys_madvise |
| .long sys_getdents64 /* 220 */ |
| .long sys_fcntl64 |
| .long sys_ni_syscall /* reserved for TUX */ |
| .long sys_ni_syscall |
| .long sys_gettid |
| .long sys_readahead /* 225 */ |
| .long sys_setxattr |
| .long sys_lsetxattr |
| .long sys_fsetxattr |
| .long sys_getxattr |
| .long sys_lgetxattr /* 230 */ |
| .long sys_fgetxattr |
| .long sys_listxattr |
| .long sys_llistxattr |
| .long sys_flistxattr |
| .long sys_removexattr /* 235 */ |
| .long sys_lremovexattr |
| .long sys_fremovexattr |
| .long sys_tkill |
| .long sys_sendfile64 |
| .long sys_futex /* 240 */ |
| .long sys_sched_setaffinity |
| .long sys_sched_getaffinity |
| .long sys_ni_syscall /* sys_set_thread_area */ |
| .long sys_ni_syscall /* sys_get_thread_area */ |
| .long sys_io_setup /* 245 */ |
| .long sys_io_destroy |
| .long sys_io_getevents |
| .long sys_io_submit |
| .long sys_io_cancel |
| .long sys_fadvise64 /* 250 */ |
| .long sys_ni_syscall |
| .long sys_exit_group |
| .long sys_lookup_dcookie |
| .long sys_epoll_create |
| .long sys_epoll_ctl /* 255 */ |
| .long sys_epoll_wait |
| .long sys_remap_file_pages |
| .long sys_set_tid_address |
| .long sys_timer_create |
| .long sys_timer_settime /* 260 */ |
| .long sys_timer_gettime |
| .long sys_timer_getoverrun |
| .long sys_timer_delete |
| .long sys_clock_settime |
| .long sys_clock_gettime /* 265 */ |
| .long sys_clock_getres |
| .long sys_clock_nanosleep |
| .long sys_statfs64 |
| .long sys_fstatfs64 |
| .long sys_tgkill /* 270 */ |
| .long sys_utimes |
| .long sys_fadvise64_64 |
| .long sys_ni_syscall /* sys_vserver */ |
| .long sys_ni_syscall /* sys_mbind */ |
| .long sys_ni_syscall /* 275 sys_get_mempolicy */ |
| .long sys_ni_syscall /* sys_set_mempolicy */ |
| .long sys_mq_open |
| .long sys_mq_unlink |
| .long sys_mq_timedsend |
| .long sys_mq_timedreceive /* 280 */ |
| .long sys_mq_notify |
| .long sys_mq_getsetattr |
| .long sys_ni_syscall /* reserved for kexec */ |
| .long sys_waitid |
| .long sys_ni_syscall /* 285 */ /* available */ |
| .long sys_add_key |
| .long sys_request_key |
| .long sys_keyctl |
| .long sys_ioprio_set |
| .long sys_ioprio_get /* 290 */ |
| .long sys_inotify_init |
| .long sys_inotify_add_watch |
| .long sys_inotify_rm_watch |
| .long sys_migrate_pages |
| .long sys_openat /* 295 */ |
| .long sys_mkdirat |
| .long sys_mknodat |
| .long sys_fchownat |
| .long sys_futimesat |
| .long sys_fstatat64 /* 300 */ |
| .long sys_unlinkat |
| .long sys_renameat |
| .long sys_linkat |
| .long sys_symlinkat |
| .long sys_readlinkat /* 305 */ |
| .long sys_fchmodat |
| .long sys_faccessat |
| .long sys_pselect6 |
| .long sys_ppoll |
| .long sys_unshare /* 310 */ |
| .long sys_set_robust_list |
| .long sys_get_robust_list |
| .long sys_splice |
| .long sys_sync_file_range |
| .long sys_tee /* 315 */ |
| .long sys_vmsplice |
| .long sys_move_pages |
| .long sys_getcpu |
| .long sys_epoll_pwait |
| .long sys_utimensat /* 320 */ |
| .long sys_signalfd |
| .long sys_ni_syscall |
| .long sys_eventfd |
| .long sys_fallocate |
| |
| /* |
| * NOTE!! This doesn't have to be exact - we just have |
| * to make sure we have _enough_ of the "sys_ni_syscall" |
| * entries. Don't panic if you notice that this hasn't |
| * been shrunk every time we add a new system call. |
| */ |
| |
| .rept NR_syscalls-(.-sys_call_table)/4 |
| .long sys_ni_syscall |
| .endr |
| |
