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 <linux/threads.h>
40 #include <asm/blackfin.h>
41 #include <asm/errno.h>
42 #include <asm/fixed_code.h>
43 #include <asm/thread_info.h> /* TIF_NEED_RESCHED */
44 #include <asm/asm-offsets.h>
45 #include <asm/trace.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 = 0x26; /* Data CPLB Miss */
90 if cc jump _ex_dcplb_miss (BP);
91 R6 = 0x23; /* Data CPLB Miss */
93 if cc jump _ex_dcplb_viol (BP);
94 /* Handle 0x23 Data CPLB Protection Violation
95 * and Data CPLB Multiple Hits - Linux Trap Zero
98 ENDPROC(_ex_workaround_261)
102 #define _ex_dviol _ex_dcplb_viol
104 #define _ex_dviol _ex_trap_c
106 #define _ex_dmiss _ex_dcplb_miss
107 #define _ex_dmult _ex_trap_c
111 ENTRY(_ex_dcplb_viol)
112 ENTRY(_ex_dcplb_miss)
113 ENTRY(_ex_icplb_miss)
114 (R7:6,P5:4) = [sp++];
115 /* We leave the previously pushed ASTAT on the stack. */
118 /* We must load R1 here, _before_ DEBUG_HWTRACE_SAVE, since that
119 * will change the stack pointer. */
123 DEBUG_HWTRACE_SAVE(p5, r7)
129 IF !CC JUMP _handle_bad_cplb;
131 #ifdef CONFIG_DEBUG_DOUBLEFAULT
132 /* While we were processing this, did we double fault? */
133 r7 = SEQSTAT; /* reason code is in bit 5:0 */
134 r6.l = lo(SEQSTAT_EXCAUSE);
135 r6.h = hi(SEQSTAT_EXCAUSE);
139 if CC JUMP _double_fault;
142 DEBUG_HWTRACE_RESTORE(p5, r7)
147 ENDPROC(_ex_icplb_miss)
150 raise 15; /* invoked by TRAP #0, for sys call */
151 jump.s _bfin_return_from_exception;
161 ENTRY(_ex_single_step)
162 /* If we just returned from an interrupt, the single step event is
163 for the RTI instruction. */
167 if cc jump _bfin_return_from_exception;
170 /* Don't do single step in hardware exception handler */
175 if cc jump _bfin_return_from_exception;
177 if cc jump _bfin_return_from_exception;
179 /* skip single step if current interrupt priority is higher than
180 * that of the first instruction, from which gdb starts single step */
183 .Lfind_priority_start:
185 if cc jump .Lfind_priority_done;
189 if cc jump .Lfind_priority_done;
190 jump.s .Lfind_priority_start;
191 .Lfind_priority_done:
192 p4.l = _kgdb_single_step;
193 p4.h = _kgdb_single_step;
196 if cc jump .Ldo_single_step;
202 /* If we were in user mode, do the single step normally. */
212 /* Single stepping only a single instruction, so clear the trace
221 * We were in an interrupt handler. By convention, all of them save
222 * SYSCFG with their first instruction, so by checking whether our
223 * RETX points at the entry point, we can determine whether to allow
224 * a single step, or whether to clear SYSCFG.
226 * First, find out the interrupt level and the event vector for it.
236 /* What we actually do is test for the _second_ instruction in the
237 * IRQ handler. That way, if there are insns following the restore
238 * of SYSCFG after leaving the handler, we will not turn off SYSCFG
245 if !cc jump _bfin_return_from_exception;
251 /* Fall through to _bfin_return_from_exception. */
252 ENDPROC(_ex_single_step)
254 ENTRY(_bfin_return_from_exception)
262 #ifdef CONFIG_DEBUG_DOUBLEFAULT
263 /* While we were processing the current exception,
264 * did we cause another, and double fault?
266 r7 = SEQSTAT; /* reason code is in bit 5:0 */
267 r6.l = lo(SEQSTAT_EXCAUSE);
268 r6.h = hi(SEQSTAT_EXCAUSE);
272 if CC JUMP _double_fault;
274 /* Did we cause a HW error? */
278 r7 = 0x20; /* Did I just cause anther HW error? */
281 if CC JUMP _double_fault;
284 (R7:6,P5:4) = [sp++];
288 ENDPROC(_bfin_return_from_exception)
290 ENTRY(_handle_bad_cplb)
291 DEBUG_HWTRACE_RESTORE(p5, r7)
292 /* To get here, we just tried and failed to change a CPLB
293 * so, handle things in trap_c (C code), by lowering to
294 * IRQ5, just like we normally do. Since this is not a
295 * "normal" return path, we have a do alot of stuff to
296 * the stack to get ready so, we can fall through - we
297 * need to make a CPLB exception look like a normal exception
300 /* ASTAT is still on the stack, where it is needed. */
301 [--sp] = (R7:6,P5:4);
303 ENTRY(_ex_replaceable)
307 /* Make sure we are not in a double fault */
312 if CC jump _double_fault;
314 /* Call C code (trap_c) to handle the exception, which most
315 * likely involves sending a signal to the current process.
316 * To avoid double faults, lower our priority to IRQ5 first.
318 P5.h = _exception_to_level5;
319 P5.l = _exception_to_level5;
326 #ifndef CONFIG_DEBUG_DOUBLEFAULT
329 * Save these registers, as they are only valid in exception context
330 * (where we are now - as soon as we defer to IRQ5, they can change)
331 * DCPLB_STATUS and ICPLB_STATUS are also only valid in EVT3,
332 * but they are not very interesting, so don't save them
335 p4.l = lo(DCPLB_FAULT_ADDR);
336 p4.h = hi(DCPLB_FAULT_ADDR);
338 [p5 + PDA_DCPLB] = r7;
340 p4.l = lo(ICPLB_FAULT_ADDR);
341 p4.h = hi(ICPLB_FAULT_ADDR);
343 [p5 + PDA_ICPLB] = r6;
346 [p5 + PDA_RETX] = r6;
349 [p5 + PDA_SYSCFG] = r6;
353 /* Disable all interrupts, but make sure level 5 is enabled so
354 * we can switch to that level. Save the old mask. */
356 [p5 + PDA_EXIMASK] = r6;
358 p4.l = lo(SAFE_USER_INSTRUCTION);
359 p4.h = hi(SAFE_USER_INSTRUCTION);
366 jump.s _bfin_return_from_exception;
369 /* We just realized we got an exception, while we were processing a different
370 * exception. This is a unrecoverable event, so crash.
371 * Note: this cannot be ENTRY() as we jump here with "if cc jump" ...
374 /* Turn caches & protection off, to ensure we don't get any more
378 P4.L = LO(IMEM_CONTROL);
379 P4.H = HI(IMEM_CONTROL);
381 R5 = [P4]; /* Control Register*/
382 BITCLR(R5,ENICPLB_P);
383 SSYNC; /* SSYNC required before writing to IMEM_CONTROL. */
388 P4.L = LO(DMEM_CONTROL);
389 P4.H = HI(DMEM_CONTROL);
391 BITCLR(R5,ENDCPLB_P);
392 SSYNC; /* SSYNC required before writing to DMEM_CONTROL. */
397 /* Fix up the stack */
398 (R7:6,P5:4) = [sp++];
402 /* We should be out of the exception stack, and back down into
403 * kernel or user space stack
407 /* The dumping functions expect the return address in the RETI
412 r0 = sp; /* stack frame pt_regs pointer argument ==> r0 */
414 call _double_fault_c;
416 .L_double_fault_panic:
417 JUMP .L_double_fault_panic
419 ENDPROC(_double_fault)
421 ENTRY(_exception_to_level5)
424 GET_PDA(p4, r7); /* Fetch current PDA */
425 r6 = [p4 + PDA_RETX];
428 r6 = [p4 + PDA_SYSCFG];
429 [sp + PT_SYSCFG] = r6;
431 /* Restore interrupt mask. We haven't pushed RETI, so this
432 * doesn't enable interrupts until we return from this handler. */
433 r6 = [p4 + PDA_EXIMASK];
436 /* Restore the hardware error vector. */
447 r0 = [p2]; /* Read current IPEND */
448 [sp + PT_IPEND] = r0; /* Store IPEND */
450 r0 = sp; /* stack frame pt_regs pointer argument ==> r0 */
455 #ifdef CONFIG_DEBUG_DOUBLEFAULT
460 r1 = 0x20; /* Did I just cause anther HW error? */
463 if CC JUMP _double_fault;
466 call _ret_from_exception;
469 ENDPROC(_exception_to_level5)
471 ENTRY(_trap) /* Exception: 4th entry into system event table(supervisor mode)*/
472 /* Since the kernel stack can be anywhere, it's not guaranteed to be
473 * covered by a CPLB. Switch to an exception stack; use RETN as a
474 * scratch register (for want of a better option).
478 sp = [sp + PDA_EXSTACK]
479 /* Try to deal with syscalls quickly. */
481 [--sp] = (R7:6,P5:4);
483 #if ANOMALY_05000283 || ANOMALY_05000315
492 #ifdef CONFIG_DEBUG_DOUBLEFAULT
494 * Save these registers, as they are only valid in exception context
495 * (where we are now - as soon as we defer to IRQ5, they can change)
496 * DCPLB_STATUS and ICPLB_STATUS are also only valid in EVT3,
497 * but they are not very interesting, so don't save them
501 p4.l = lo(DCPLB_FAULT_ADDR);
502 p4.h = hi(DCPLB_FAULT_ADDR);
504 [p5 + PDA_DCPLB] = r7;
506 p4.l = lo(ICPLB_FAULT_ADDR);
507 p4.h = hi(ICPLB_FAULT_ADDR);
509 [p5 + PDA_ICPLB] = r7;
512 [p5 + PDA_RETX] = r6;
514 r7 = SEQSTAT; /* reason code is in bit 5:0 */
515 [p5 + PDA_SEQSTAT] = r7;
517 r7 = SEQSTAT; /* reason code is in bit 5:0 */
519 r6.l = lo(SEQSTAT_EXCAUSE);
520 r6.h = hi(SEQSTAT_EXCAUSE);
530 r7 = -ENOSYS; /* signextending enough */
531 [sp + PT_R0] = r7; /* return value from system call */
532 jump .Lsyscall_really_exit;
535 ENTRY(_kernel_execve)
538 r3 = SIZEOF_PTREGS / 4;
544 if !cc jump .Lclear_regs (bp);
552 if ! cc jump .Lexecve_failed;
553 /* Success. Copy our temporary pt_regs to the top of the kernel
554 * stack and do a normal exception return.
557 r0 = (-KERNEL_STACK_SIZE) (x);
561 r0 = KERNEL_STACK_SIZE - 4 (z);
567 r3 = SIZEOF_PTREGS / 4;
573 if ! cc jump .Lcopy_regs (bp);
575 r0 = (KERNEL_STACK_SIZE - SIZEOF_PTREGS) (z);
580 [SP + PT_SYSCFG] = r0;
581 [p3 + (TASK_THREAD + THREAD_KSP)] = sp;
588 ENDPROC(_kernel_execve)
596 [sp + PT_IPEND] = r0;
598 /* Store RETS for now */
600 [sp + PT_RESERVED] = r0;
601 /* Set the stack for the current process */
603 r6.l = lo(ALIGN_PAGE_MASK);
604 r6.h = hi(ALIGN_PAGE_MASK);
605 r7 = r7 & r6; /* thread_info */
609 [p2+(TASK_THREAD+THREAD_KSP)] = sp;
611 /* Check the System Call */
613 /* System call number is passed in P0 */
616 if ! cc jump .Lbadsys;
618 /* are we tracing syscalls?*/
620 r6.l = lo(ALIGN_PAGE_MASK);
621 r6.h = hi(ALIGN_PAGE_MASK);
625 CC = BITTST(r7,TIF_SYSCALL_TRACE);
626 if CC JUMP _sys_trace;
628 /* Execute the appropriate system call */
631 p5.l = _sys_call_table;
632 p5.h = _sys_call_table;
649 r4.l = lo(ALIGN_PAGE_MASK);
650 r4.h = hi(ALIGN_PAGE_MASK);
651 r7 = r7 & r4; /* thread_info->flags */
653 .Lresume_userspace_1:
654 /* Disable interrupts. */
658 r7 = [p5 + TI_FLAGS];
659 r4.l = lo(_TIF_WORK_MASK);
660 r4.h = hi(_TIF_WORK_MASK);
664 cc = BITTST(r7, TIF_NEED_RESCHED);
665 if !cc jump .Lsyscall_sigpending;
667 /* Reenable interrupts. */
675 jump .Lresume_userspace_1;
677 .Lsyscall_sigpending:
678 cc = BITTST(r7, TIF_RESTORE_SIGMASK);
679 if cc jump .Lsyscall_do_signals;
680 cc = BITTST(r7, TIF_SIGPENDING);
681 if !cc jump .Lsyscall_really_exit;
682 .Lsyscall_do_signals:
683 /* Reenable interrupts. */
692 .Lsyscall_really_exit:
693 r5 = [sp + PT_RESERVED];
696 ENDPROC(_system_call)
698 /* Do not mark as ENTRY() to avoid error in assembler ...
699 * this symbol need not be global anyways, so ...
704 /* Execute the appropriate system call */
707 p5.l = _sys_call_table;
708 p5.h = _sys_call_table;
727 jump .Lresume_userspace;
732 * Beware - when entering resume, prev (the current task) is
733 * in r0, next (the new task) is in r1.
739 [--sp] = (r7:4, p5:3);
743 [p0+(TASK_THREAD+THREAD_USP)] = p2;
745 /* save current kernel stack pointer */
746 [p0+(TASK_THREAD+THREAD_KSP)] = sp;
748 /* save program counter */
749 r1.l = _new_old_task;
750 r1.h = _new_old_task;
751 [p0+(TASK_THREAD+THREAD_PC)] = r1;
753 /* restore the kernel stack pointer */
754 sp = [p1+(TASK_THREAD+THREAD_KSP)];
756 /* restore user stack pointer */
757 p0 = [p1+(TASK_THREAD+THREAD_USP)];
761 p0 = [p1+(TASK_THREAD+THREAD_PC)];
765 * Following code actually lands up in a new (old) task.
769 (r7:4, p5:3) = [sp++];
774 * When we come out of resume, r0 carries "old" task, becuase we are
780 ENTRY(_ret_from_exception)
786 [sp + PT_IPEND] = r0;
792 if !cc jump 4f; /* if not return to user mode, get out */
794 /* Make sure any pending system call or deferred exception
795 * return in ILAT for this process to get executed, otherwise
796 * in case context switch happens, system call of
797 * first process (i.e in ILAT) will be carried
798 * forward to the switched process
804 r1 = (EVT_IVG14 | EVT_IVG15) (z);
809 /* Set the stack for the current process */
811 r4.l = lo(ALIGN_PAGE_MASK);
812 r4.h = hi(ALIGN_PAGE_MASK);
813 r7 = r7 & r4; /* thread_info->flags */
815 r7 = [p5 + TI_FLAGS];
816 r4.l = lo(_TIF_WORK_MASK);
817 r4.h = hi(_TIF_WORK_MASK);
824 p1.l = _schedule_and_signal;
825 p1.h = _schedule_and_signal;
828 raise 15; /* raise evt14 to do signal or reschedule */
835 ENDPROC(_ret_from_exception)
837 ENTRY(_return_from_int)
838 /* If someone else already raised IRQ 15, do nothing. */
843 cc = bittst (r0, EVT_IVG15_P);
846 /* if not return to user mode, get out */
860 /* Lower the interrupt level to 15. */
863 p1.l = _schedule_and_signal_from_int;
864 p1.h = _schedule_and_signal_from_int;
868 r0.l = lo(SAFE_USER_INSTRUCTION);
869 r0.h = hi(SAFE_USER_INSTRUCTION);
874 raise 15; /* raise evt15 to do signal or reschedule */
878 ENDPROC(_return_from_int)
880 ENTRY(_lower_to_irq14)
882 r0.l = lo(SAFE_USER_INSTRUCTION);
883 r0.h = hi(SAFE_USER_INSTRUCTION);
890 ENTRY(_evt14_softirq)
891 #ifdef CONFIG_DEBUG_HWERR
901 _schedule_and_signal_from_int:
902 /* To end up here, vector 15 was changed - so we have to change it
907 p1.l = _evt_system_call;
908 p1.h = _evt_system_call;
912 /* Set orig_p0 to -1 to indicate this isn't the end of a syscall. */
914 [sp + PT_ORIG_P0] = r0;
917 [sp + PT_RESERVED] = p1;
920 GET_PDA(p0, r0); /* Fetch current PDA (can't migrate to other CPU here) */
921 r0 = [p0 + PDA_IRQFLAGS];
923 p0.l = _bfin_irq_flags;
924 p0.h = _bfin_irq_flags;
931 call _finish_atomic_sections;
933 jump.s .Lresume_userspace;
935 _schedule_and_signal:
937 /* To end up here, vector 15 was changed - so we have to change it
942 p1.l = _evt_system_call;
943 p1.h = _evt_system_call;
948 [sp + PT_RESERVED] = P0;
949 call .Lresume_userspace;
953 ENDPROC(_lower_to_irq14)
955 /* We handle this 100% in exception space - to reduce overhead
956 * Only potiential problem is if the software buffer gets swapped out of the
957 * CPLB table - then double fault. - so we don't let this happen in other places
959 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
960 ENTRY(_ex_trace_buff_full)
966 P5.L = _trace_buff_offset;
967 P5.H = _trace_buff_offset;
968 P3 = [P5]; /* trace_buff_offset */
972 R7 <<= 1; /* double, since we need to read twice */
974 R7 <<= 2; /* need to shift over again,
975 * to get the number of bytes */
978 R6 = ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN)*1024) - 1;
985 P2.L = _trace_buff_offset;
986 P2.H = _trace_buff_offset;
989 P2.L = _software_trace_buff;
990 P2.H = _software_trace_buff;
992 LSETUP (.Lstart, .Lend) LC0;
994 R7 = [P5]; /* read TBUF */
1008 jump _bfin_return_from_exception;
1009 ENDPROC(_ex_trace_buff_full)
1011 #if CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN == 4
1015 #endif /* CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN */
1016 ENTRY(_trace_buff_offset)
1019 ENTRY(_software_trace_buff)
1020 .rept ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN)*256);
1023 #endif /* CONFIG_DEBUG_BFIN_HWTRACE_EXPAND */
1025 #if CONFIG_EARLY_PRINTK
1029 trace_buffer_stop(p0,r0);
1031 #if ANOMALY_05000283 || ANOMALY_05000315
1040 /* Turn caches off, to ensure we don't get double exceptions */
1042 P4.L = LO(IMEM_CONTROL);
1043 P4.H = HI(IMEM_CONTROL);
1045 R5 = [P4]; /* Control Register*/
1046 BITCLR(R5,ENICPLB_P);
1048 SSYNC; /* SSYNC required before writing to IMEM_CONTROL. */
1053 P4.L = LO(DMEM_CONTROL);
1054 P4.H = HI(DMEM_CONTROL);
1056 BITCLR(R5,ENDCPLB_P);
1057 SSYNC; /* SSYNC required before writing to DMEM_CONTROL. */
1063 r0 = sp; /* stack frame pt_regs pointer argument ==> r0 */
1069 ENDPROC(_early_trap)
1071 #endif /* CONFIG_EARLY_PRINTK */
1074 * Put these in the kernel data section - that should always be covered by
1075 * a CPLB. This is needed to ensure we don't get double fault conditions
1078 #ifdef CONFIG_SYSCALL_TAB_L1
1085 /* entry for each EXCAUSE[5:0]
1086 * This table must be in sync with the table in ./kernel/traps.c
1087 * EXCPT instruction can provide 4 bits of EXCAUSE, allowing 16 to be user defined
1089 .long _ex_syscall /* 0x00 - User Defined - Linux Syscall */
1090 .long _ex_soft_bp /* 0x01 - User Defined - Software breakpoint */
1092 .long _ex_trap_c /* 0x02 - User Defined - KGDB initial connection
1093 and break signal trap */
1095 .long _ex_replaceable /* 0x02 - User Defined */
1097 .long _ex_trap_c /* 0x03 - User Defined - userspace stack overflow */
1098 .long _ex_trap_c /* 0x04 - User Defined - dump trace buffer */
1099 .long _ex_replaceable /* 0x05 - User Defined */
1100 .long _ex_replaceable /* 0x06 - User Defined */
1101 .long _ex_replaceable /* 0x07 - User Defined */
1102 .long _ex_replaceable /* 0x08 - User Defined */
1103 .long _ex_replaceable /* 0x09 - User Defined */
1104 .long _ex_replaceable /* 0x0A - User Defined */
1105 .long _ex_replaceable /* 0x0B - User Defined */
1106 .long _ex_replaceable /* 0x0C - User Defined */
1107 .long _ex_replaceable /* 0x0D - User Defined */
1108 .long _ex_replaceable /* 0x0E - User Defined */
1109 .long _ex_replaceable /* 0x0F - User Defined */
1110 .long _ex_single_step /* 0x10 - HW Single step */
1111 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
1112 .long _ex_trace_buff_full /* 0x11 - Trace Buffer Full */
1114 .long _ex_trap_c /* 0x11 - Trace Buffer Full */
1116 .long _ex_trap_c /* 0x12 - Reserved */
1117 .long _ex_trap_c /* 0x13 - Reserved */
1118 .long _ex_trap_c /* 0x14 - Reserved */
1119 .long _ex_trap_c /* 0x15 - Reserved */
1120 .long _ex_trap_c /* 0x16 - Reserved */
1121 .long _ex_trap_c /* 0x17 - Reserved */
1122 .long _ex_trap_c /* 0x18 - Reserved */
1123 .long _ex_trap_c /* 0x19 - Reserved */
1124 .long _ex_trap_c /* 0x1A - Reserved */
1125 .long _ex_trap_c /* 0x1B - Reserved */
1126 .long _ex_trap_c /* 0x1C - Reserved */
1127 .long _ex_trap_c /* 0x1D - Reserved */
1128 .long _ex_trap_c /* 0x1E - Reserved */
1129 .long _ex_trap_c /* 0x1F - Reserved */
1130 .long _ex_trap_c /* 0x20 - Reserved */
1131 .long _ex_trap_c /* 0x21 - Undefined Instruction */
1132 .long _ex_trap_c /* 0x22 - Illegal Instruction Combination */
1133 .long _ex_dviol /* 0x23 - Data CPLB Protection Violation */
1134 .long _ex_trap_c /* 0x24 - Data access misaligned */
1135 .long _ex_trap_c /* 0x25 - Unrecoverable Event */
1136 .long _ex_dmiss /* 0x26 - Data CPLB Miss */
1137 .long _ex_dmult /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero */
1138 .long _ex_trap_c /* 0x28 - Emulation Watchpoint */
1139 .long _ex_trap_c /* 0x29 - Instruction fetch access error (535 only) */
1140 .long _ex_trap_c /* 0x2A - Instruction fetch misaligned */
1141 .long _ex_trap_c /* 0x2B - Instruction CPLB protection Violation */
1142 .long _ex_icplb_miss /* 0x2C - Instruction CPLB miss */
1143 .long _ex_trap_c /* 0x2D - Instruction CPLB Multiple Hits */
1144 .long _ex_trap_c /* 0x2E - Illegal use of Supervisor Resource */
1145 .long _ex_trap_c /* 0x2E - Illegal use of Supervisor Resource */
1146 .long _ex_trap_c /* 0x2F - Reserved */
1147 .long _ex_trap_c /* 0x30 - Reserved */
1148 .long _ex_trap_c /* 0x31 - Reserved */
1149 .long _ex_trap_c /* 0x32 - Reserved */
1150 .long _ex_trap_c /* 0x33 - Reserved */
1151 .long _ex_trap_c /* 0x34 - Reserved */
1152 .long _ex_trap_c /* 0x35 - Reserved */
1153 .long _ex_trap_c /* 0x36 - Reserved */
1154 .long _ex_trap_c /* 0x37 - Reserved */
1155 .long _ex_trap_c /* 0x38 - Reserved */
1156 .long _ex_trap_c /* 0x39 - Reserved */
1157 .long _ex_trap_c /* 0x3A - Reserved */
1158 .long _ex_trap_c /* 0x3B - Reserved */
1159 .long _ex_trap_c /* 0x3C - Reserved */
1160 .long _ex_trap_c /* 0x3D - Reserved */
1161 .long _ex_trap_c /* 0x3E - Reserved */
1162 .long _ex_trap_c /* 0x3F - Reserved */
1165 ENTRY(_sys_call_table)
1166 .long _sys_restart_syscall /* 0 */
1171 .long _sys_open /* 5 */
1173 .long _sys_ni_syscall /* old waitpid */
1176 .long _sys_unlink /* 10 */
1181 .long _sys_chmod /* 15 */
1182 .long _sys_chown /* chown16 */
1183 .long _sys_ni_syscall /* old break syscall holder */
1184 .long _sys_ni_syscall /* old stat */
1186 .long _sys_getpid /* 20 */
1188 .long _sys_ni_syscall /* old umount */
1191 .long _sys_stime /* 25 */
1194 .long _sys_ni_syscall /* old fstat */
1196 .long _sys_ni_syscall /* old utime */ /* 30 */
1197 .long _sys_ni_syscall /* old stty syscall holder */
1198 .long _sys_ni_syscall /* old gtty syscall holder */
1201 .long _sys_ni_syscall /* 35 */ /* old ftime syscall holder */
1206 .long _sys_rmdir /* 40 */
1210 .long _sys_ni_syscall /* old prof syscall holder */
1211 .long _sys_brk /* 45 */
1214 .long _sys_ni_syscall /* old sys_signal */
1215 .long _sys_geteuid /* geteuid16 */
1216 .long _sys_getegid /* getegid16 */ /* 50 */
1218 .long _sys_umount /* recycled never used phys() */
1219 .long _sys_ni_syscall /* old lock syscall holder */
1221 .long _sys_fcntl /* 55 */
1222 .long _sys_ni_syscall /* old mpx syscall holder */
1224 .long _sys_ni_syscall /* old ulimit syscall holder */
1225 .long _sys_ni_syscall /* old old uname */
1226 .long _sys_umask /* 60 */
1231 .long _sys_getpgrp /* 65 */
1233 .long _sys_ni_syscall /* old sys_sigaction */
1236 .long _sys_setreuid /* setreuid16 */ /* 70 */
1237 .long _sys_setregid /* setregid16 */
1238 .long _sys_ni_syscall /* old sys_sigsuspend */
1239 .long _sys_ni_syscall /* old sys_sigpending */
1240 .long _sys_sethostname
1241 .long _sys_setrlimit /* 75 */
1242 .long _sys_ni_syscall /* old getrlimit */
1243 .long _sys_getrusage
1244 .long _sys_gettimeofday
1245 .long _sys_settimeofday
1246 .long _sys_getgroups /* getgroups16 */ /* 80 */
1247 .long _sys_setgroups /* setgroups16 */
1248 .long _sys_ni_syscall /* old_select */
1250 .long _sys_ni_syscall /* old lstat */
1251 .long _sys_readlink /* 85 */
1253 .long _sys_ni_syscall /* sys_swapon */
1255 .long _sys_ni_syscall /* old_readdir */
1256 .long _sys_ni_syscall /* sys_mmap */ /* 90 */
1259 .long _sys_ftruncate
1261 .long _sys_fchown /* fchown16 */ /* 95 */
1262 .long _sys_getpriority
1263 .long _sys_setpriority
1264 .long _sys_ni_syscall /* old profil syscall holder */
1266 .long _sys_fstatfs /* 100 */
1267 .long _sys_ni_syscall
1268 .long _sys_ni_syscall /* old sys_socketcall */
1270 .long _sys_setitimer
1271 .long _sys_getitimer /* 105 */
1275 .long _sys_ni_syscall /* old uname */
1276 .long _sys_ni_syscall /* iopl for i386 */ /* 110 */
1278 .long _sys_ni_syscall /* obsolete idle() syscall */
1279 .long _sys_ni_syscall /* vm86old for i386 */
1281 .long _sys_ni_syscall /* 115 */ /* sys_swapoff */
1283 .long _sys_ni_syscall /* old sys_ipc */
1285 .long _sys_ni_syscall /* old sys_sigreturn */
1286 .long _sys_clone /* 120 */
1287 .long _sys_setdomainname
1289 .long _sys_ni_syscall /* old sys_modify_ldt */
1291 .long _sys_ni_syscall /* 125 */ /* sys_mprotect */
1292 .long _sys_ni_syscall /* old sys_sigprocmask */
1293 .long _sys_ni_syscall /* old "creat_module" */
1294 .long _sys_init_module
1295 .long _sys_delete_module
1296 .long _sys_ni_syscall /* 130: old "get_kernel_syms" */
1301 .long _sys_ni_syscall /* 135 */ /* sys_sysfs */
1302 .long _sys_personality
1303 .long _sys_ni_syscall /* for afs_syscall */
1304 .long _sys_setfsuid /* setfsuid16 */
1305 .long _sys_setfsgid /* setfsgid16 */
1306 .long _sys_llseek /* 140 */
1308 .long _sys_ni_syscall /* sys_select */
1310 .long _sys_ni_syscall /* sys_msync */
1311 .long _sys_readv /* 145 */
1314 .long _sys_fdatasync
1316 .long _sys_ni_syscall /* 150 */ /* sys_mlock */
1317 .long _sys_ni_syscall /* sys_munlock */
1318 .long _sys_ni_syscall /* sys_mlockall */
1319 .long _sys_ni_syscall /* sys_munlockall */
1320 .long _sys_sched_setparam
1321 .long _sys_sched_getparam /* 155 */
1322 .long _sys_sched_setscheduler
1323 .long _sys_sched_getscheduler
1324 .long _sys_sched_yield
1325 .long _sys_sched_get_priority_max
1326 .long _sys_sched_get_priority_min /* 160 */
1327 .long _sys_sched_rr_get_interval
1328 .long _sys_nanosleep
1330 .long _sys_setresuid /* setresuid16 */
1331 .long _sys_getresuid /* getresuid16 */ /* 165 */
1332 .long _sys_ni_syscall /* for vm86 */
1333 .long _sys_ni_syscall /* old "query_module" */
1334 .long _sys_ni_syscall /* sys_poll */
1335 .long _sys_nfsservctl
1336 .long _sys_setresgid /* setresgid16 */ /* 170 */
1337 .long _sys_getresgid /* getresgid16 */
1339 .long _sys_rt_sigreturn
1340 .long _sys_rt_sigaction
1341 .long _sys_rt_sigprocmask /* 175 */
1342 .long _sys_rt_sigpending
1343 .long _sys_rt_sigtimedwait
1344 .long _sys_rt_sigqueueinfo
1345 .long _sys_rt_sigsuspend
1346 .long _sys_pread64 /* 180 */
1348 .long _sys_lchown /* lchown16 */
1351 .long _sys_capset /* 185 */
1352 .long _sys_sigaltstack
1354 .long _sys_ni_syscall /* streams1 */
1355 .long _sys_ni_syscall /* streams2 */
1356 .long _sys_vfork /* 190 */
1357 .long _sys_getrlimit
1359 .long _sys_truncate64
1360 .long _sys_ftruncate64
1361 .long _sys_stat64 /* 195 */
1366 .long _sys_getgid /* 200 */
1371 .long _sys_getgroups /* 205 */
1372 .long _sys_setgroups
1374 .long _sys_setresuid
1375 .long _sys_getresuid
1376 .long _sys_setresgid /* 210 */
1377 .long _sys_getresgid
1381 .long _sys_setfsuid /* 215 */
1383 .long _sys_pivot_root
1384 .long _sys_ni_syscall /* sys_mincore */
1385 .long _sys_ni_syscall /* sys_madvise */
1386 .long _sys_getdents64 /* 220 */
1388 .long _sys_ni_syscall /* reserved for TUX */
1389 .long _sys_ni_syscall
1391 .long _sys_readahead /* 225 */
1393 .long _sys_lsetxattr
1394 .long _sys_fsetxattr
1396 .long _sys_lgetxattr /* 230 */
1397 .long _sys_fgetxattr
1398 .long _sys_listxattr
1399 .long _sys_llistxattr
1400 .long _sys_flistxattr
1401 .long _sys_removexattr /* 235 */
1402 .long _sys_lremovexattr
1403 .long _sys_fremovexattr
1405 .long _sys_sendfile64
1406 .long _sys_futex /* 240 */
1407 .long _sys_sched_setaffinity
1408 .long _sys_sched_getaffinity
1409 .long _sys_ni_syscall /* sys_set_thread_area */
1410 .long _sys_ni_syscall /* sys_get_thread_area */
1411 .long _sys_io_setup /* 245 */
1412 .long _sys_io_destroy
1413 .long _sys_io_getevents
1414 .long _sys_io_submit
1415 .long _sys_io_cancel
1416 .long _sys_ni_syscall /* 250 */ /* sys_alloc_hugepages */
1417 .long _sys_ni_syscall /* sys_freec_hugepages */
1418 .long _sys_exit_group
1419 .long _sys_lookup_dcookie
1420 .long _sys_bfin_spinlock
1421 .long _sys_epoll_create /* 255 */
1422 .long _sys_epoll_ctl
1423 .long _sys_epoll_wait
1424 .long _sys_ni_syscall /* remap_file_pages */
1425 .long _sys_set_tid_address
1426 .long _sys_timer_create /* 260 */
1427 .long _sys_timer_settime
1428 .long _sys_timer_gettime
1429 .long _sys_timer_getoverrun
1430 .long _sys_timer_delete
1431 .long _sys_clock_settime /* 265 */
1432 .long _sys_clock_gettime
1433 .long _sys_clock_getres
1434 .long _sys_clock_nanosleep
1436 .long _sys_fstatfs64 /* 270 */
1439 .long _sys_fadvise64_64
1440 .long _sys_ni_syscall /* vserver */
1441 .long _sys_ni_syscall /* 275, mbind */
1442 .long _sys_ni_syscall /* get_mempolicy */
1443 .long _sys_ni_syscall /* set_mempolicy */
1445 .long _sys_mq_unlink
1446 .long _sys_mq_timedsend /* 280 */
1447 .long _sys_mq_timedreceive
1448 .long _sys_mq_notify
1449 .long _sys_mq_getsetattr
1450 .long _sys_ni_syscall /* kexec_load */
1451 .long _sys_waitid /* 285 */
1453 .long _sys_request_key
1455 .long _sys_ioprio_set
1456 .long _sys_ioprio_get /* 290 */
1457 .long _sys_inotify_init
1458 .long _sys_inotify_add_watch
1459 .long _sys_inotify_rm_watch
1460 .long _sys_ni_syscall /* migrate_pages */
1461 .long _sys_openat /* 295 */
1465 .long _sys_futimesat
1466 .long _sys_fstatat64 /* 300 */
1470 .long _sys_symlinkat
1471 .long _sys_readlinkat /* 305 */
1473 .long _sys_faccessat
1476 .long _sys_unshare /* 310 */
1477 .long _sys_sram_alloc
1478 .long _sys_sram_free
1479 .long _sys_dma_memcpy
1481 .long _sys_bind /* 315 */
1483 .long _sys_getpeername
1484 .long _sys_getsockname
1485 .long _sys_getsockopt
1486 .long _sys_listen /* 320 */
1491 .long _sys_sendmsg /* 325 */
1493 .long _sys_setsockopt
1496 .long _sys_socketpair /* 330 */
1501 .long _sys_msgget /* 335 */
1506 .long _sys_shmdt /* 340 */
1509 .long _sys_sync_file_range
1511 .long _sys_vmsplice /* 345 */
1512 .long _sys_epoll_pwait
1513 .long _sys_utimensat
1515 .long _sys_timerfd_create
1516 .long _sys_eventfd /* 350 */
1519 .long _sys_fadvise64
1520 .long _sys_set_robust_list
1521 .long _sys_get_robust_list /* 355 */
1522 .long _sys_fallocate
1523 .long _sys_semtimedop
1524 .long _sys_timerfd_settime
1525 .long _sys_timerfd_gettime
1526 .long _sys_signalfd4 /* 360 */
1528 .long _sys_epoll_create1
1531 .long _sys_inotify_init1 /* 365 */
1533 .rept NR_syscalls-(.-_sys_call_table)/4
1534 .long _sys_ni_syscall
1536 END(_sys_call_table)
1538 #ifdef CONFIG_EXCEPTION_L1_SCRATCH
1539 /* .section .l1.bss.scratch */
1540 .set _exception_stack_top, L1_SCRATCH_START + L1_SCRATCH_LENGTH
1542 #ifdef CONFIG_SYSCALL_TAB_L1
1547 ENTRY(_exception_stack)
1548 .rept 1024 * NR_CPUS
1551 _exception_stack_top: