2 * File: arch/blackfin/mach-common/entry.S
4 * Author: Linus Torvalds
7 * Description: contains the system-call and fault low-level handling routines.
8 * This also contains the timer-interrupt handler, as well as all
9 * interrupts and faults that can result in a task-switch.
12 * Copyright 2004-2006 Analog Devices Inc.
14 * Bugs: Enter bugs at http://blackfin.uclinux.org/
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, see the file COPYING, or write
28 * to the Free Software Foundation, Inc.,
29 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
32 /* NOTE: This code handles signal-recognition, which happens every time
33 * after a timer-interrupt and after each system call.
36 #include <linux/init.h>
37 #include <linux/linkage.h>
38 #include <linux/unistd.h>
39 #include <asm/blackfin.h>
40 #include <asm/errno.h>
41 #include <asm/fixed_code.h>
42 #include <asm/thread_info.h> /* TIF_NEED_RESCHED */
43 #include <asm/asm-offsets.h>
44 #include <asm/trace.h>
45 #include <asm/traps.h>
47 #include <asm/context.S>
49 #if defined(CONFIG_BFIN_SCRATCH_REG_RETN)
50 # define EX_SCRATCH_REG RETN
51 #elif defined(CONFIG_BFIN_SCRATCH_REG_RETE)
52 # define EX_SCRATCH_REG RETE
54 # define EX_SCRATCH_REG CYCLES
57 #ifdef CONFIG_EXCPT_IRQ_SYSC_L1
63 /* Slightly simplified and streamlined entry point for CPLB misses.
64 * This one does not lower the level to IRQ5, and thus can be used to
65 * patch up CPLB misses on the kernel stack.
68 #define _ex_dviol _ex_workaround_261
69 #define _ex_dmiss _ex_workaround_261
70 #define _ex_dmult _ex_workaround_261
72 ENTRY(_ex_workaround_261)
74 * Work around an anomaly: if we see a new DCPLB fault, return
75 * without doing anything. Then, if we get the same fault again,
78 P4 = R7; /* Store EXCAUSE */
81 r7 = [p5 + PDA_LFRETX];
83 [p5 + PDA_LFRETX] = r6;
85 if !cc jump _bfin_return_from_exception;
88 R6 = VEC_CPLB_M; /* Data CPLB Miss */
90 if cc jump _ex_dcplb_miss (BP);
92 R6 = VEC_CPLB_VL; /* Data CPLB Violation */
94 if cc jump _ex_dcplb_viol (BP);
96 /* Handle Data CPLB Protection Violation
97 * and Data CPLB Multiple Hits - Linux Trap Zero
100 ENDPROC(_ex_workaround_261)
104 #define _ex_dviol _ex_dcplb_viol
106 #define _ex_dviol _ex_trap_c
108 #define _ex_dmiss _ex_dcplb_miss
109 #define _ex_dmult _ex_trap_c
113 ENTRY(_ex_dcplb_viol)
114 ENTRY(_ex_dcplb_miss)
115 ENTRY(_ex_icplb_miss)
116 (R7:6,P5:4) = [sp++];
117 /* We leave the previously pushed ASTAT on the stack. */
120 /* We must load R1 here, _before_ DEBUG_HWTRACE_SAVE, since that
121 * will change the stack pointer. */
125 DEBUG_HWTRACE_SAVE(p5, r7)
131 IF !CC JUMP _handle_bad_cplb;
133 #ifdef CONFIG_DEBUG_DOUBLEFAULT
134 /* While we were processing this, did we double fault? */
135 r7 = SEQSTAT; /* reason code is in bit 5:0 */
136 r6.l = lo(SEQSTAT_EXCAUSE);
137 r6.h = hi(SEQSTAT_EXCAUSE);
141 if CC JUMP _double_fault;
144 DEBUG_HWTRACE_RESTORE(p5, r7)
149 ENDPROC(_ex_icplb_miss)
152 raise 15; /* invoked by TRAP #0, for sys call */
153 jump.s _bfin_return_from_exception;
156 ENTRY(_ex_single_step)
157 /* If we just returned from an interrupt, the single step event is
158 for the RTI instruction. */
162 if cc jump _bfin_return_from_exception;
165 /* Don't do single step in hardware exception handler */
170 if cc jump _bfin_return_from_exception;
172 if cc jump _bfin_return_from_exception;
174 /* skip single step if current interrupt priority is higher than
175 * that of the first instruction, from which gdb starts single step */
178 .Lfind_priority_start:
180 if cc jump .Lfind_priority_done;
184 if cc jump .Lfind_priority_done;
185 jump.s .Lfind_priority_start;
186 .Lfind_priority_done:
187 p4.l = _kgdb_single_step;
188 p4.h = _kgdb_single_step;
191 if cc jump .Ldo_single_step;
197 /* If we were in user mode, do the single step normally. */
206 #ifdef CONFIG_EXACT_HWERR
207 /* Read the ILAT, and to check to see if the process we are
208 * single stepping caused a previous hardware error
209 * If so, do not single step, (which lowers to IRQ5, and makes
210 * us miss the error).
215 cc = bittst(r7, EVT_IVHW_P);
218 /* Single stepping only a single instruction, so clear the trace
221 bitclr (r7, SYSCFG_SSSTEP_P);
227 * We were in an interrupt handler. By convention, all of them save
228 * SYSCFG with their first instruction, so by checking whether our
229 * RETX points at the entry point, we can determine whether to allow
230 * a single step, or whether to clear SYSCFG.
232 * First, find out the interrupt level and the event vector for it.
242 /* What we actually do is test for the _second_ instruction in the
243 * IRQ handler. That way, if there are insns following the restore
244 * of SYSCFG after leaving the handler, we will not turn off SYSCFG
251 if !cc jump _bfin_return_from_exception;
254 bitclr (r7, SYSCFG_SSSTEP_P); /* Turn off single step */
257 /* Fall through to _bfin_return_from_exception. */
258 ENDPROC(_ex_single_step)
260 ENTRY(_bfin_return_from_exception)
268 #ifdef CONFIG_DEBUG_DOUBLEFAULT
269 /* While we were processing the current exception,
270 * did we cause another, and double fault?
272 r7 = SEQSTAT; /* reason code is in bit 5:0 */
273 r6.l = lo(SEQSTAT_EXCAUSE);
274 r6.h = hi(SEQSTAT_EXCAUSE);
278 if CC JUMP _double_fault;
281 (R7:6,P5:4) = [sp++];
285 ENDPROC(_bfin_return_from_exception)
287 ENTRY(_handle_bad_cplb)
288 DEBUG_HWTRACE_RESTORE(p5, r7)
289 /* To get here, we just tried and failed to change a CPLB
290 * so, handle things in trap_c (C code), by lowering to
291 * IRQ5, just like we normally do. Since this is not a
292 * "normal" return path, we have a do alot of stuff to
293 * the stack to get ready so, we can fall through - we
294 * need to make a CPLB exception look like a normal exception
297 /* ASTAT is still on the stack, where it is needed. */
298 [--sp] = (R7:6,P5:4);
300 ENTRY(_ex_replaceable)
304 /* The only thing that has been saved in this context is
305 * (R7:6,P5:4), ASTAT & SP - don't use anything else
310 /* Make sure we are not in a double fault */
315 if CC jump _double_fault;
316 [p5 + PDA_EXIPEND] = r7;
318 /* Call C code (trap_c) to handle the exception, which most
319 * likely involves sending a signal to the current process.
320 * To avoid double faults, lower our priority to IRQ5 first.
322 r7.h = _exception_to_level5;
323 r7.l = _exception_to_level5;
329 #ifndef CONFIG_DEBUG_DOUBLEFAULT
332 * Save these registers, as they are only valid in exception context
333 * (where we are now - as soon as we defer to IRQ5, they can change)
334 * DCPLB_STATUS and ICPLB_STATUS are also only valid in EVT3,
335 * but they are not very interesting, so don't save them
338 p4.l = lo(DCPLB_FAULT_ADDR);
339 p4.h = hi(DCPLB_FAULT_ADDR);
341 [p5 + PDA_DCPLB] = r7;
343 p4.l = lo(ICPLB_FAULT_ADDR);
344 p4.h = hi(ICPLB_FAULT_ADDR);
346 [p5 + PDA_ICPLB] = r6;
349 [p5 + PDA_RETX] = r6;
351 /* Save the state of single stepping */
353 [p5 + PDA_SYSCFG] = r6;
354 /* Clear it while we handle the exception in IRQ5 mode */
355 BITCLR(r6, SYSCFG_SSSTEP_P);
358 /* Save the current IMASK, since we change in order to jump to level 5 */
360 [p5 + PDA_EXIMASK] = r6;
362 p4.l = lo(SAFE_USER_INSTRUCTION);
363 p4.h = hi(SAFE_USER_INSTRUCTION);
366 /* Disable all interrupts, but make sure level 5 is enabled so
367 * we can switch to that level.
372 /* In case interrupts are disabled IPEND[4] (global interrupt disable bit)
373 * clear it (re-enabling interrupts again) by the special sequence of pushing
374 * RETI onto the stack. This way we can lower ourselves to IVG5 even if the
375 * exception was taken after the interrupt handler was called but before it
376 * got a chance to enable global interrupts itself.
382 jump.s _bfin_return_from_exception;
385 /* We just realized we got an exception, while we were processing a different
386 * exception. This is a unrecoverable event, so crash.
387 * Note: this cannot be ENTRY() as we jump here with "if cc jump" ...
390 /* Turn caches & protection off, to ensure we don't get any more
394 P4.L = LO(IMEM_CONTROL);
395 P4.H = HI(IMEM_CONTROL);
397 R5 = [P4]; /* Control Register*/
398 BITCLR(R5,ENICPLB_P);
399 SSYNC; /* SSYNC required before writing to IMEM_CONTROL. */
404 P4.L = LO(DMEM_CONTROL);
405 P4.H = HI(DMEM_CONTROL);
407 BITCLR(R5,ENDCPLB_P);
408 SSYNC; /* SSYNC required before writing to DMEM_CONTROL. */
413 /* Fix up the stack */
414 (R7:6,P5:4) = [sp++];
418 /* We should be out of the exception stack, and back down into
419 * kernel or user space stack
423 /* The dumping functions expect the return address in the RETI
428 r0 = sp; /* stack frame pt_regs pointer argument ==> r0 */
430 call _double_fault_c;
432 .L_double_fault_panic:
433 JUMP .L_double_fault_panic
435 ENDPROC(_double_fault)
437 ENTRY(_exception_to_level5)
440 GET_PDA(p5, r7); /* Fetch current PDA */
441 r6 = [p5 + PDA_RETX];
444 r6 = [p5 + PDA_SYSCFG];
445 [sp + PT_SYSCFG] = r6;
447 /* Restore the hardware error vector. */
455 #ifdef CONFIG_DEBUG_DOUBLEFAULT
456 /* Now that we have the hardware error vector programmed properly
457 * we can re-enable interrupts (IPEND[4]), so if the _trap_c causes
458 * another hardware error, we can catch it (self-nesting).
464 r7 = [p5 + PDA_EXIPEND] /* Read the IPEND from the Exception state */
465 [sp + PT_IPEND] = r7; /* Store IPEND onto the stack */
467 r0 = sp; /* stack frame pt_regs pointer argument ==> r0 */
472 /* If interrupts were off during the exception (IPEND[4] = 1), turn them off
475 CC = BITTST(r7, EVT_IRPTEN_P)
477 /* this will load a random value into the reti register - but that is OK,
478 * since we do restore it to the correct value in the 'RESTORE_ALL_SYS' macro
483 /* restore the interrupt mask (IMASK) */
484 r6 = [p5 + PDA_EXIMASK];
487 call _ret_from_exception;
490 ENDPROC(_exception_to_level5)
492 ENTRY(_trap) /* Exception: 4th entry into system event table(supervisor mode)*/
493 /* Since the kernel stack can be anywhere, it's not guaranteed to be
494 * covered by a CPLB. Switch to an exception stack; use RETN as a
495 * scratch register (for want of a better option).
499 sp = [sp + PDA_EXSTACK]
500 /* Try to deal with syscalls quickly. */
502 [--sp] = (R7:6,P5:4);
504 #ifdef CONFIG_EXACT_HWERR
505 /* Make sure all pending read/writes complete. This will ensure any
506 * accesses which could cause hardware errors completes, and signal
507 * the the hardware before we do something silly, like crash the
508 * kernel. We don't need to work around anomaly 05000312, since
509 * we are already atomic
514 #if ANOMALY_05000283 || ANOMALY_05000315
523 #ifdef CONFIG_DEBUG_DOUBLEFAULT
525 * Save these registers, as they are only valid in exception context
526 * (where we are now - as soon as we defer to IRQ5, they can change)
527 * DCPLB_STATUS and ICPLB_STATUS are also only valid in EVT3,
528 * but they are not very interesting, so don't save them
532 p4.l = lo(DCPLB_FAULT_ADDR);
533 p4.h = hi(DCPLB_FAULT_ADDR);
535 [p5 + PDA_DCPLB] = r7;
537 p4.l = lo(ICPLB_FAULT_ADDR);
538 p4.h = hi(ICPLB_FAULT_ADDR);
540 [p5 + PDA_ICPLB] = r7;
543 [p5 + PDA_RETX] = r6;
545 r7 = SEQSTAT; /* reason code is in bit 5:0 */
546 [p5 + PDA_SEQSTAT] = r7;
548 r7 = SEQSTAT; /* reason code is in bit 5:0 */
550 r6.l = lo(SEQSTAT_EXCAUSE);
551 r6.h = hi(SEQSTAT_EXCAUSE);
561 r7 = -ENOSYS; /* signextending enough */
562 [sp + PT_R0] = r7; /* return value from system call */
563 jump .Lsyscall_really_exit;
566 ENTRY(_kernel_execve)
569 r3 = SIZEOF_PTREGS / 4;
575 if !cc jump .Lclear_regs (bp);
583 if ! cc jump .Lexecve_failed;
584 /* Success. Copy our temporary pt_regs to the top of the kernel
585 * stack and do a normal exception return.
588 r0 = (-KERNEL_STACK_SIZE) (x);
592 r0 = KERNEL_STACK_SIZE - 4 (z);
598 r3 = SIZEOF_PTREGS / 4;
604 if ! cc jump .Lcopy_regs (bp);
606 r0 = (KERNEL_STACK_SIZE - SIZEOF_PTREGS) (z);
611 [SP + PT_SYSCFG] = r0;
612 [p3 + (TASK_THREAD + THREAD_KSP)] = sp;
619 ENDPROC(_kernel_execve)
627 [sp + PT_IPEND] = r0;
629 /* Store RETS for now */
631 [sp + PT_RESERVED] = r0;
632 /* Set the stack for the current process */
634 r6.l = lo(ALIGN_PAGE_MASK);
635 r6.h = hi(ALIGN_PAGE_MASK);
636 r7 = r7 & r6; /* thread_info */
640 [p2+(TASK_THREAD+THREAD_KSP)] = sp;
644 call ___ipipe_syscall_root;
647 if cc jump .Lsyscall_really_exit;
649 if cc jump .Lresume_userspace;
652 p0 = [sp + PT_ORIG_P0];
653 #endif /* CONFIG_IPIPE */
655 /* Check the System Call */
657 /* System call number is passed in P0 */
660 if ! cc jump .Lbadsys;
662 /* are we tracing syscalls?*/
664 r6.l = lo(ALIGN_PAGE_MASK);
665 r6.h = hi(ALIGN_PAGE_MASK);
669 CC = BITTST(r7,TIF_SYSCALL_TRACE);
670 if CC JUMP _sys_trace;
672 /* Execute the appropriate system call */
675 p5.l = _sys_call_table;
676 p5.h = _sys_call_table;
693 r4.l = lo(ALIGN_PAGE_MASK);
694 r4.h = hi(ALIGN_PAGE_MASK);
695 r7 = r7 & r4; /* thread_info->flags */
697 .Lresume_userspace_1:
698 /* Disable interrupts. */
702 r7 = [p5 + TI_FLAGS];
703 r4.l = lo(_TIF_WORK_MASK);
704 r4.h = hi(_TIF_WORK_MASK);
709 cc = BITTST(r7, TIF_IRQ_SYNC);
710 if !cc jump .Lsyscall_no_irqsync;
714 call ___ipipe_sync_root;
716 jump .Lresume_userspace_1;
717 .Lsyscall_no_irqsync:
719 cc = BITTST(r7, TIF_NEED_RESCHED);
720 if !cc jump .Lsyscall_sigpending;
722 /* Reenable interrupts. */
730 jump .Lresume_userspace_1;
732 .Lsyscall_sigpending:
733 cc = BITTST(r7, TIF_RESTORE_SIGMASK);
734 if cc jump .Lsyscall_do_signals;
735 cc = BITTST(r7, TIF_SIGPENDING);
736 if !cc jump .Lsyscall_really_exit;
737 .Lsyscall_do_signals:
738 /* Reenable interrupts. */
747 .Lsyscall_really_exit:
748 r5 = [sp + PT_RESERVED];
753 #endif /* CONFIG_IPIPE */
755 ENDPROC(_system_call)
757 /* Do not mark as ENTRY() to avoid error in assembler ...
758 * this symbol need not be global anyways, so ...
763 /* Execute the appropriate system call */
766 p5.l = _sys_call_table;
767 p5.h = _sys_call_table;
786 jump .Lresume_userspace;
791 * Beware - when entering resume, prev (the current task) is
792 * in r0, next (the new task) is in r1.
798 [--sp] = (r7:4, p5:3);
802 [p0+(TASK_THREAD+THREAD_USP)] = p2;
804 /* save current kernel stack pointer */
805 [p0+(TASK_THREAD+THREAD_KSP)] = sp;
807 /* save program counter */
808 r1.l = _new_old_task;
809 r1.h = _new_old_task;
810 [p0+(TASK_THREAD+THREAD_PC)] = r1;
812 /* restore the kernel stack pointer */
813 sp = [p1+(TASK_THREAD+THREAD_KSP)];
815 /* restore user stack pointer */
816 p0 = [p1+(TASK_THREAD+THREAD_USP)];
820 p0 = [p1+(TASK_THREAD+THREAD_PC)];
824 * Following code actually lands up in a new (old) task.
828 (r7:4, p5:3) = [sp++];
833 * When we come out of resume, r0 carries "old" task, becuase we are
839 ENTRY(_ret_from_exception)
843 call ___ipipe_check_root
847 if cc jump 4f; /* not on behalf of Linux, get out */
848 #endif /* CONFIG_IPIPE */
854 [sp + PT_IPEND] = r0;
860 if !cc jump 4f; /* if not return to user mode, get out */
862 /* Make sure any pending system call or deferred exception
863 * return in ILAT for this process to get executed, otherwise
864 * in case context switch happens, system call of
865 * first process (i.e in ILAT) will be carried
866 * forward to the switched process
872 r1 = (EVT_IVG14 | EVT_IVG15) (z);
877 /* Set the stack for the current process */
879 r4.l = lo(ALIGN_PAGE_MASK);
880 r4.h = hi(ALIGN_PAGE_MASK);
881 r7 = r7 & r4; /* thread_info->flags */
883 r7 = [p5 + TI_FLAGS];
884 r4.l = lo(_TIF_WORK_MASK);
885 r4.h = hi(_TIF_WORK_MASK);
892 p1.l = _schedule_and_signal;
893 p1.h = _schedule_and_signal;
896 raise 15; /* raise evt15 to do signal or reschedule */
899 bitclr(r0, SYSCFG_SSSTEP_P); /* Turn off single step */
903 ENDPROC(_ret_from_exception)
908 [--sp] = reti; /* Reenable interrupts */
910 jump.l ___ipipe_sync_root
912 _resume_kernel_from_int:
913 r0.l = _sync_root_irqs
914 r0.h = _sync_root_irqs
916 [--sp] = ( r7:4, p5:3 );
918 call ___ipipe_call_irqtail
920 ( r7:4, p5:3 ) = [sp++];
924 #define _resume_kernel_from_int 2f
927 ENTRY(_return_from_int)
928 /* If someone else already raised IRQ 15, do nothing. */
933 cc = bittst (r0, EVT_IVG15_P);
936 /* if not return to user mode, get out */
948 if !cc jump _resume_kernel_from_int;
950 /* Lower the interrupt level to 15. */
953 p1.l = _schedule_and_signal_from_int;
954 p1.h = _schedule_and_signal_from_int;
957 #if ANOMALY_05000281 || ANOMALY_05000461
958 r0.l = lo(SAFE_USER_INSTRUCTION);
959 r0.h = hi(SAFE_USER_INSTRUCTION);
964 raise 15; /* raise evt15 to do signal or reschedule */
968 ENDPROC(_return_from_int)
970 ENTRY(_lower_to_irq14)
971 #if ANOMALY_05000281 || ANOMALY_05000461
972 r0.l = lo(SAFE_USER_INSTRUCTION);
973 r0.h = hi(SAFE_USER_INSTRUCTION);
977 #ifdef CONFIG_DEBUG_HWERR
978 /* enable irq14 & hwerr interrupt, until we transition to _evt14_softirq */
979 r0 = (EVT_IVG14 | EVT_IVHW | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU);
981 /* Only enable irq14 interrupt, until we transition to _evt14_softirq */
982 r0 = (EVT_IVG14 | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU);
987 ENDPROC(_lower_to_irq14)
989 ENTRY(_evt14_softirq)
990 #ifdef CONFIG_DEBUG_HWERR
991 r0 = (EVT_IVHW | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU);
999 ENDPROC(_evt14_softirq)
1001 ENTRY(_schedule_and_signal_from_int)
1002 /* To end up here, vector 15 was changed - so we have to change it
1007 p1.l = _evt_system_call;
1008 p1.h = _evt_system_call;
1012 /* Set orig_p0 to -1 to indicate this isn't the end of a syscall. */
1014 [sp + PT_ORIG_P0] = r0;
1017 [sp + PT_RESERVED] = p1;
1020 GET_PDA(p0, r0); /* Fetch current PDA (can't migrate to other CPU here) */
1021 r0 = [p0 + PDA_IRQFLAGS];
1023 p0.l = _bfin_irq_flags;
1024 p0.h = _bfin_irq_flags;
1031 call _finish_atomic_sections;
1033 jump.s .Lresume_userspace;
1034 ENDPROC(_schedule_and_signal_from_int)
1036 ENTRY(_schedule_and_signal)
1037 SAVE_CONTEXT_SYSCALL
1038 /* To end up here, vector 15 was changed - so we have to change it
1043 p1.l = _evt_system_call;
1044 p1.h = _evt_system_call;
1049 [sp + PT_RESERVED] = P0;
1050 call .Lresume_userspace;
1054 ENDPROC(_schedule_and_signal)
1056 /* We handle this 100% in exception space - to reduce overhead
1057 * Only potiential problem is if the software buffer gets swapped out of the
1058 * CPLB table - then double fault. - so we don't let this happen in other places
1060 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
1061 ENTRY(_ex_trace_buff_full)
1067 P5.L = _trace_buff_offset;
1068 P5.H = _trace_buff_offset;
1069 P3 = [P5]; /* trace_buff_offset */
1070 P5.L = lo(TBUFSTAT);
1071 P5.H = hi(TBUFSTAT);
1073 R7 <<= 1; /* double, since we need to read twice */
1075 R7 <<= 2; /* need to shift over again,
1076 * to get the number of bytes */
1079 R6 = ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN)*1024) - 1;
1086 P2.L = _trace_buff_offset;
1087 P2.H = _trace_buff_offset;
1090 P2.L = _software_trace_buff;
1091 P2.H = _software_trace_buff;
1093 LSETUP (.Lstart, .Lend) LC0;
1095 R7 = [P5]; /* read TBUF */
1109 jump _bfin_return_from_exception;
1110 ENDPROC(_ex_trace_buff_full)
1112 #if CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN == 4
1116 #endif /* CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN */
1117 ENTRY(_trace_buff_offset)
1120 ENTRY(_software_trace_buff)
1121 .rept ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN)*256);
1124 #endif /* CONFIG_DEBUG_BFIN_HWTRACE_EXPAND */
1126 #if CONFIG_EARLY_PRINTK
1130 trace_buffer_stop(p0,r0);
1132 #if ANOMALY_05000283 || ANOMALY_05000315
1141 /* Turn caches off, to ensure we don't get double exceptions */
1143 P4.L = LO(IMEM_CONTROL);
1144 P4.H = HI(IMEM_CONTROL);
1146 R5 = [P4]; /* Control Register*/
1147 BITCLR(R5,ENICPLB_P);
1149 SSYNC; /* SSYNC required before writing to IMEM_CONTROL. */
1154 P4.L = LO(DMEM_CONTROL);
1155 P4.H = HI(DMEM_CONTROL);
1157 BITCLR(R5,ENDCPLB_P);
1158 SSYNC; /* SSYNC required before writing to DMEM_CONTROL. */
1164 r0 = sp; /* stack frame pt_regs pointer argument ==> r0 */
1170 ENDPROC(_early_trap)
1172 #endif /* CONFIG_EARLY_PRINTK */
1175 * Put these in the kernel data section - that should always be covered by
1176 * a CPLB. This is needed to ensure we don't get double fault conditions
1179 #ifdef CONFIG_SYSCALL_TAB_L1
1186 /* entry for each EXCAUSE[5:0]
1187 * This table must be in sync with the table in ./kernel/traps.c
1188 * EXCPT instruction can provide 4 bits of EXCAUSE, allowing 16 to be user defined
1190 .long _ex_syscall /* 0x00 - User Defined - Linux Syscall */
1191 .long _ex_trap_c /* 0x01 - User Defined - Software breakpoint */
1193 .long _ex_trap_c /* 0x02 - User Defined - KGDB initial connection
1194 and break signal trap */
1196 .long _ex_replaceable /* 0x02 - User Defined */
1198 .long _ex_trap_c /* 0x03 - User Defined - userspace stack overflow */
1199 .long _ex_trap_c /* 0x04 - User Defined - dump trace buffer */
1200 .long _ex_replaceable /* 0x05 - User Defined */
1201 .long _ex_replaceable /* 0x06 - User Defined */
1202 .long _ex_replaceable /* 0x07 - User Defined */
1203 .long _ex_replaceable /* 0x08 - User Defined */
1204 .long _ex_replaceable /* 0x09 - User Defined */
1205 .long _ex_replaceable /* 0x0A - User Defined */
1206 .long _ex_replaceable /* 0x0B - User Defined */
1207 .long _ex_replaceable /* 0x0C - User Defined */
1208 .long _ex_replaceable /* 0x0D - User Defined */
1209 .long _ex_replaceable /* 0x0E - User Defined */
1210 .long _ex_replaceable /* 0x0F - User Defined */
1211 .long _ex_single_step /* 0x10 - HW Single step */
1212 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
1213 .long _ex_trace_buff_full /* 0x11 - Trace Buffer Full */
1215 .long _ex_trap_c /* 0x11 - Trace Buffer Full */
1217 .long _ex_trap_c /* 0x12 - Reserved */
1218 .long _ex_trap_c /* 0x13 - Reserved */
1219 .long _ex_trap_c /* 0x14 - Reserved */
1220 .long _ex_trap_c /* 0x15 - Reserved */
1221 .long _ex_trap_c /* 0x16 - Reserved */
1222 .long _ex_trap_c /* 0x17 - Reserved */
1223 .long _ex_trap_c /* 0x18 - Reserved */
1224 .long _ex_trap_c /* 0x19 - Reserved */
1225 .long _ex_trap_c /* 0x1A - Reserved */
1226 .long _ex_trap_c /* 0x1B - Reserved */
1227 .long _ex_trap_c /* 0x1C - Reserved */
1228 .long _ex_trap_c /* 0x1D - Reserved */
1229 .long _ex_trap_c /* 0x1E - Reserved */
1230 .long _ex_trap_c /* 0x1F - Reserved */
1231 .long _ex_trap_c /* 0x20 - Reserved */
1232 .long _ex_trap_c /* 0x21 - Undefined Instruction */
1233 .long _ex_trap_c /* 0x22 - Illegal Instruction Combination */
1234 .long _ex_dviol /* 0x23 - Data CPLB Protection Violation */
1235 .long _ex_trap_c /* 0x24 - Data access misaligned */
1236 .long _ex_trap_c /* 0x25 - Unrecoverable Event */
1237 .long _ex_dmiss /* 0x26 - Data CPLB Miss */
1238 .long _ex_dmult /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero */
1239 .long _ex_trap_c /* 0x28 - Emulation Watchpoint */
1240 .long _ex_trap_c /* 0x29 - Instruction fetch access error (535 only) */
1241 .long _ex_trap_c /* 0x2A - Instruction fetch misaligned */
1242 .long _ex_trap_c /* 0x2B - Instruction CPLB protection Violation */
1243 .long _ex_icplb_miss /* 0x2C - Instruction CPLB miss */
1244 .long _ex_trap_c /* 0x2D - Instruction CPLB Multiple Hits */
1245 .long _ex_trap_c /* 0x2E - Illegal use of Supervisor Resource */
1246 .long _ex_trap_c /* 0x2E - Illegal use of Supervisor Resource */
1247 .long _ex_trap_c /* 0x2F - Reserved */
1248 .long _ex_trap_c /* 0x30 - Reserved */
1249 .long _ex_trap_c /* 0x31 - Reserved */
1250 .long _ex_trap_c /* 0x32 - Reserved */
1251 .long _ex_trap_c /* 0x33 - Reserved */
1252 .long _ex_trap_c /* 0x34 - Reserved */
1253 .long _ex_trap_c /* 0x35 - Reserved */
1254 .long _ex_trap_c /* 0x36 - Reserved */
1255 .long _ex_trap_c /* 0x37 - Reserved */
1256 .long _ex_trap_c /* 0x38 - Reserved */
1257 .long _ex_trap_c /* 0x39 - Reserved */
1258 .long _ex_trap_c /* 0x3A - Reserved */
1259 .long _ex_trap_c /* 0x3B - Reserved */
1260 .long _ex_trap_c /* 0x3C - Reserved */
1261 .long _ex_trap_c /* 0x3D - Reserved */
1262 .long _ex_trap_c /* 0x3E - Reserved */
1263 .long _ex_trap_c /* 0x3F - Reserved */
1266 ENTRY(_sys_call_table)
1267 .long _sys_restart_syscall /* 0 */
1272 .long _sys_open /* 5 */
1274 .long _sys_ni_syscall /* old waitpid */
1277 .long _sys_unlink /* 10 */
1282 .long _sys_chmod /* 15 */
1283 .long _sys_chown /* chown16 */
1284 .long _sys_ni_syscall /* old break syscall holder */
1285 .long _sys_ni_syscall /* old stat */
1287 .long _sys_getpid /* 20 */
1289 .long _sys_ni_syscall /* old umount */
1292 .long _sys_stime /* 25 */
1295 .long _sys_ni_syscall /* old fstat */
1297 .long _sys_ni_syscall /* old utime */ /* 30 */
1298 .long _sys_ni_syscall /* old stty syscall holder */
1299 .long _sys_ni_syscall /* old gtty syscall holder */
1302 .long _sys_ni_syscall /* 35 */ /* old ftime syscall holder */
1307 .long _sys_rmdir /* 40 */
1311 .long _sys_ni_syscall /* old prof syscall holder */
1312 .long _sys_brk /* 45 */
1315 .long _sys_ni_syscall /* old sys_signal */
1316 .long _sys_geteuid /* geteuid16 */
1317 .long _sys_getegid /* getegid16 */ /* 50 */
1319 .long _sys_umount /* recycled never used phys() */
1320 .long _sys_ni_syscall /* old lock syscall holder */
1322 .long _sys_fcntl /* 55 */
1323 .long _sys_ni_syscall /* old mpx syscall holder */
1325 .long _sys_ni_syscall /* old ulimit syscall holder */
1326 .long _sys_ni_syscall /* old old uname */
1327 .long _sys_umask /* 60 */
1332 .long _sys_getpgrp /* 65 */
1334 .long _sys_ni_syscall /* old sys_sigaction */
1337 .long _sys_setreuid /* setreuid16 */ /* 70 */
1338 .long _sys_setregid /* setregid16 */
1339 .long _sys_ni_syscall /* old sys_sigsuspend */
1340 .long _sys_ni_syscall /* old sys_sigpending */
1341 .long _sys_sethostname
1342 .long _sys_setrlimit /* 75 */
1343 .long _sys_ni_syscall /* old getrlimit */
1344 .long _sys_getrusage
1345 .long _sys_gettimeofday
1346 .long _sys_settimeofday
1347 .long _sys_getgroups /* getgroups16 */ /* 80 */
1348 .long _sys_setgroups /* setgroups16 */
1349 .long _sys_ni_syscall /* old_select */
1351 .long _sys_ni_syscall /* old lstat */
1352 .long _sys_readlink /* 85 */
1354 .long _sys_ni_syscall /* sys_swapon */
1356 .long _sys_ni_syscall /* old_readdir */
1357 .long _sys_ni_syscall /* sys_mmap */ /* 90 */
1360 .long _sys_ftruncate
1362 .long _sys_fchown /* fchown16 */ /* 95 */
1363 .long _sys_getpriority
1364 .long _sys_setpriority
1365 .long _sys_ni_syscall /* old profil syscall holder */
1367 .long _sys_fstatfs /* 100 */
1368 .long _sys_ni_syscall
1369 .long _sys_ni_syscall /* old sys_socketcall */
1371 .long _sys_setitimer
1372 .long _sys_getitimer /* 105 */
1376 .long _sys_ni_syscall /* old uname */
1377 .long _sys_ni_syscall /* iopl for i386 */ /* 110 */
1379 .long _sys_ni_syscall /* obsolete idle() syscall */
1380 .long _sys_ni_syscall /* vm86old for i386 */
1382 .long _sys_ni_syscall /* 115 */ /* sys_swapoff */
1384 .long _sys_ni_syscall /* old sys_ipc */
1386 .long _sys_ni_syscall /* old sys_sigreturn */
1387 .long _sys_clone /* 120 */
1388 .long _sys_setdomainname
1390 .long _sys_ni_syscall /* old sys_modify_ldt */
1392 .long _sys_ni_syscall /* 125 */ /* sys_mprotect */
1393 .long _sys_ni_syscall /* old sys_sigprocmask */
1394 .long _sys_ni_syscall /* old "creat_module" */
1395 .long _sys_init_module
1396 .long _sys_delete_module
1397 .long _sys_ni_syscall /* 130: old "get_kernel_syms" */
1402 .long _sys_ni_syscall /* 135 */ /* sys_sysfs */
1403 .long _sys_personality
1404 .long _sys_ni_syscall /* for afs_syscall */
1405 .long _sys_setfsuid /* setfsuid16 */
1406 .long _sys_setfsgid /* setfsgid16 */
1407 .long _sys_llseek /* 140 */
1409 .long _sys_ni_syscall /* sys_select */
1411 .long _sys_ni_syscall /* sys_msync */
1412 .long _sys_readv /* 145 */
1415 .long _sys_fdatasync
1417 .long _sys_ni_syscall /* 150 */ /* sys_mlock */
1418 .long _sys_ni_syscall /* sys_munlock */
1419 .long _sys_ni_syscall /* sys_mlockall */
1420 .long _sys_ni_syscall /* sys_munlockall */
1421 .long _sys_sched_setparam
1422 .long _sys_sched_getparam /* 155 */
1423 .long _sys_sched_setscheduler
1424 .long _sys_sched_getscheduler
1425 .long _sys_sched_yield
1426 .long _sys_sched_get_priority_max
1427 .long _sys_sched_get_priority_min /* 160 */
1428 .long _sys_sched_rr_get_interval
1429 .long _sys_nanosleep
1431 .long _sys_setresuid /* setresuid16 */
1432 .long _sys_getresuid /* getresuid16 */ /* 165 */
1433 .long _sys_ni_syscall /* for vm86 */
1434 .long _sys_ni_syscall /* old "query_module" */
1435 .long _sys_ni_syscall /* sys_poll */
1436 .long _sys_nfsservctl
1437 .long _sys_setresgid /* setresgid16 */ /* 170 */
1438 .long _sys_getresgid /* getresgid16 */
1440 .long _sys_rt_sigreturn
1441 .long _sys_rt_sigaction
1442 .long _sys_rt_sigprocmask /* 175 */
1443 .long _sys_rt_sigpending
1444 .long _sys_rt_sigtimedwait
1445 .long _sys_rt_sigqueueinfo
1446 .long _sys_rt_sigsuspend
1447 .long _sys_pread64 /* 180 */
1449 .long _sys_lchown /* lchown16 */
1452 .long _sys_capset /* 185 */
1453 .long _sys_sigaltstack
1455 .long _sys_ni_syscall /* streams1 */
1456 .long _sys_ni_syscall /* streams2 */
1457 .long _sys_vfork /* 190 */
1458 .long _sys_getrlimit
1460 .long _sys_truncate64
1461 .long _sys_ftruncate64
1462 .long _sys_stat64 /* 195 */
1467 .long _sys_getgid /* 200 */
1472 .long _sys_getgroups /* 205 */
1473 .long _sys_setgroups
1475 .long _sys_setresuid
1476 .long _sys_getresuid
1477 .long _sys_setresgid /* 210 */
1478 .long _sys_getresgid
1482 .long _sys_setfsuid /* 215 */
1484 .long _sys_pivot_root
1485 .long _sys_ni_syscall /* sys_mincore */
1486 .long _sys_ni_syscall /* sys_madvise */
1487 .long _sys_getdents64 /* 220 */
1489 .long _sys_ni_syscall /* reserved for TUX */
1490 .long _sys_ni_syscall
1492 .long _sys_readahead /* 225 */
1494 .long _sys_lsetxattr
1495 .long _sys_fsetxattr
1497 .long _sys_lgetxattr /* 230 */
1498 .long _sys_fgetxattr
1499 .long _sys_listxattr
1500 .long _sys_llistxattr
1501 .long _sys_flistxattr
1502 .long _sys_removexattr /* 235 */
1503 .long _sys_lremovexattr
1504 .long _sys_fremovexattr
1506 .long _sys_sendfile64
1507 .long _sys_futex /* 240 */
1508 .long _sys_sched_setaffinity
1509 .long _sys_sched_getaffinity
1510 .long _sys_ni_syscall /* sys_set_thread_area */
1511 .long _sys_ni_syscall /* sys_get_thread_area */
1512 .long _sys_io_setup /* 245 */
1513 .long _sys_io_destroy
1514 .long _sys_io_getevents
1515 .long _sys_io_submit
1516 .long _sys_io_cancel
1517 .long _sys_ni_syscall /* 250 */ /* sys_alloc_hugepages */
1518 .long _sys_ni_syscall /* sys_freec_hugepages */
1519 .long _sys_exit_group
1520 .long _sys_lookup_dcookie
1521 .long _sys_bfin_spinlock
1522 .long _sys_epoll_create /* 255 */
1523 .long _sys_epoll_ctl
1524 .long _sys_epoll_wait
1525 .long _sys_ni_syscall /* remap_file_pages */
1526 .long _sys_set_tid_address
1527 .long _sys_timer_create /* 260 */
1528 .long _sys_timer_settime
1529 .long _sys_timer_gettime
1530 .long _sys_timer_getoverrun
1531 .long _sys_timer_delete
1532 .long _sys_clock_settime /* 265 */
1533 .long _sys_clock_gettime
1534 .long _sys_clock_getres
1535 .long _sys_clock_nanosleep
1537 .long _sys_fstatfs64 /* 270 */
1540 .long _sys_fadvise64_64
1541 .long _sys_ni_syscall /* vserver */
1542 .long _sys_ni_syscall /* 275, mbind */
1543 .long _sys_ni_syscall /* get_mempolicy */
1544 .long _sys_ni_syscall /* set_mempolicy */
1546 .long _sys_mq_unlink
1547 .long _sys_mq_timedsend /* 280 */
1548 .long _sys_mq_timedreceive
1549 .long _sys_mq_notify
1550 .long _sys_mq_getsetattr
1551 .long _sys_ni_syscall /* kexec_load */
1552 .long _sys_waitid /* 285 */
1554 .long _sys_request_key
1556 .long _sys_ioprio_set
1557 .long _sys_ioprio_get /* 290 */
1558 .long _sys_inotify_init
1559 .long _sys_inotify_add_watch
1560 .long _sys_inotify_rm_watch
1561 .long _sys_ni_syscall /* migrate_pages */
1562 .long _sys_openat /* 295 */
1566 .long _sys_futimesat
1567 .long _sys_fstatat64 /* 300 */
1571 .long _sys_symlinkat
1572 .long _sys_readlinkat /* 305 */
1574 .long _sys_faccessat
1577 .long _sys_unshare /* 310 */
1578 .long _sys_sram_alloc
1579 .long _sys_sram_free
1580 .long _sys_dma_memcpy
1582 .long _sys_bind /* 315 */
1584 .long _sys_getpeername
1585 .long _sys_getsockname
1586 .long _sys_getsockopt
1587 .long _sys_listen /* 320 */
1592 .long _sys_sendmsg /* 325 */
1594 .long _sys_setsockopt
1597 .long _sys_socketpair /* 330 */
1602 .long _sys_msgget /* 335 */
1607 .long _sys_shmdt /* 340 */
1610 .long _sys_sync_file_range
1612 .long _sys_vmsplice /* 345 */
1613 .long _sys_epoll_pwait
1614 .long _sys_utimensat
1616 .long _sys_timerfd_create
1617 .long _sys_eventfd /* 350 */
1620 .long _sys_fadvise64
1621 .long _sys_set_robust_list
1622 .long _sys_get_robust_list /* 355 */
1623 .long _sys_fallocate
1624 .long _sys_semtimedop
1625 .long _sys_timerfd_settime
1626 .long _sys_timerfd_gettime
1627 .long _sys_signalfd4 /* 360 */
1629 .long _sys_epoll_create1
1632 .long _sys_inotify_init1 /* 365 */
1635 .long _sys_rt_tgsigqueueinfo
1636 .long _sys_perf_counter_open
1638 .rept NR_syscalls-(.-_sys_call_table)/4
1639 .long _sys_ni_syscall
1641 END(_sys_call_table)