/* $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 explicitely (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/config.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 moveq 0, $r11 ; oldset param - 0 in this case move.d $sp, $r12 ; the regs param move.d $r1, $r13 ; 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 move.d [R_IRQ_MASK0_RD], $r1 ; External NMI or watchdog? and.d 0x80000000, $r1 beq wdog move.d $sp, $r10 jsr handle_nmi setf m ; Enable NMI again retb ; Return from NMI 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 moveq 2, $r2 ; first bit we care about is the timer0 irq move.d [R_VECT_MASK_RD], $r0; read the irq bits that triggered the multiple irq move.d $r0, [R_VECT_MASK_CLR] ; Block all active IRQs 1: btst $r2, $r0 ; check for the irq given by bit r2 bpl 2f move.d $r2, $r10 ; First argument to do_IRQ move.d $sp, $r11 ; second argument to do_IRQ jsr do_IRQ 2: addq 1, $r2 ; next vector bit cmp.b 32, $r2 bne 1b ; process all irq's up to and including number 31 moveq 0, $r9 ; make ret_from_intr realise we came from an ir move.d $r0, [R_VECT_MASK_SET] ; Unblock all the IRQs 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. .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 /* * 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