forked from Minki/linux
7b275523ab
Corrects compile errors and the following: - Remove oldset parameter from do_signal and do_notify_resume. - Modified to fit new consolidated IRQ handling code. - Reverse check order between external nmi and watchdog nmi to avoid false watchdog oops in case of a glitch on the nmi pin. - Return from an pin-generated NMI the same way as for other interrupts. - Moved blocking of ethernet rx/tx irq from ethernet interrupt handler to low-level asm interrupt handlers. Fixed in the multiple interrupt handler also. - Add space for thread local storage in thread_info struct. - Add NO_DMA to Kconfig, and include arch specific Kconfig using arch independent path. Include subsystem Kconfigs for pcmcia, usb, i2c, rtc and pci. Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com> Acked-by: Mikael Starvik <starvik@axis.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1185 lines
35 KiB
ArmAsm
1185 lines
35 KiB
ArmAsm
/* $Id: entry.S,v 1.28 2005/06/20 05:06:30 starvik Exp $
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*
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* linux/arch/cris/entry.S
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*
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* Copyright (C) 2000, 2001, 2002 Axis Communications AB
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*
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* Authors: Bjorn Wesen (bjornw@axis.com)
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*
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* $Log: entry.S,v $
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* Revision 1.28 2005/06/20 05:06:30 starvik
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* Remove unnecessary diff to kernel.org tree
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*
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* Revision 1.27 2005/03/04 08:16:16 starvik
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* Merge of Linux 2.6.11.
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*
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* Revision 1.26 2005/01/11 13:49:47 starvik
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* Added NMI handler.
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*
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* Revision 1.25 2004/12/27 11:18:32 starvik
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* Merge of Linux 2.6.10 (not functional yet).
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*
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* Revision 1.24 2004/12/22 10:41:23 starvik
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* Updates to make v10 compile with the latest SMP aware generic code (even
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* though v10 will never have SMP).
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*
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* Revision 1.23 2004/10/19 13:07:37 starvik
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* Merge of Linux 2.6.9
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*
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* Revision 1.22 2004/06/21 10:29:55 starvik
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* Merge of Linux 2.6.7
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*
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* Revision 1.21 2004/06/09 05:30:27 starvik
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* Clean up multiple interrupt handling.
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* Prevent interrupts from interrupting each other.
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* Handle all active interrupts.
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*
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* Revision 1.20 2004/06/08 08:55:32 starvik
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* Removed unused code
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*
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* Revision 1.19 2004/06/04 11:56:15 starvik
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* Implemented page table lookup for refills in assembler for improved performance.
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*
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* Revision 1.18 2004/05/11 12:28:25 starvik
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* Merge of Linux 2.6.6
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*
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* Revision 1.17 2003/09/11 07:29:49 starvik
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* Merge of Linux 2.6.0-test5
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*
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* Revision 1.16 2003/07/04 08:27:41 starvik
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* Merge of Linux 2.5.74
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*
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* Revision 1.15 2003/04/09 07:32:55 starvik
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* resume should return task_struct, not thread_info
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*
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* Revision 1.14 2003/04/09 05:20:44 starvik
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* Merge of Linux 2.5.67
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*
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* Revision 1.13 2002/12/11 15:42:02 starvik
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* Extracted v10 (ETRAX 100LX) specific stuff from arch/cris/kernel/*.c
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*
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* Revision 1.12 2002/12/10 09:00:10 starvik
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* Merge of Linux 2.5.51
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*
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* Revision 1.11 2002/12/05 07:53:10 starvik
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* Corrected constants used with btstq
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*
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* Revision 1.10 2002/11/27 08:45:10 starvik
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* pid is in task_struct, not thread_info
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*
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* Revision 1.9 2002/11/26 09:52:05 starvik
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* Added preemptive kernel scheduling (if CONFIG_PREEMPT)
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*
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* Revision 1.8 2002/11/20 11:56:11 starvik
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* Merge of Linux 2.5.48
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*
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* Revision 1.7 2002/11/18 13:02:42 starvik
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* Added fourth parameter to do_notify_resume
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* Minor cleanup
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*
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* Revision 1.6 2002/11/11 10:37:50 starvik
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* Use new asm-offset defines
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* Modified for new location of current->work etc
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* Removed SYMBOL_NAME from syscalls
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* Added some new syscalls
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*
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* Revision 1.5 2002/11/05 06:45:11 starvik
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* Merge of Linux 2.5.45
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*
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* Revision 1.4 2002/02/05 15:41:31 bjornw
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* Rewritten to conform better to current 2.5 code (similar to arch/i386)
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*
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* Revision 1.3 2002/01/21 15:22:20 bjornw
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* NICE_DOGGY fix from 2.4 arch/cris
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*
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* Revision 1.37 2001/12/07 17:03:55 bjornw
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* Call a c-hook called watchdog_bite_hook instead of show_registers directly
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*
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* Revision 1.36 2001/11/22 13:36:36 bjornw
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* * In ret_from_intr, check regs->dccr for usermode reentrance instead of
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* DCCR explicitly (because the latter might not reflect current reality)
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* * In mmu_bus_fault, set $r9 _after_ calling the C-code instead of before
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* since $r9 is call-clobbered and is potentially needed afterwards
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*
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* Revision 1.35 2001/10/30 17:10:15 bjornw
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* Add some syscalls
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*
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* Revision 1.34 2001/10/01 14:45:03 bjornw
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* Removed underscores and added register prefixes
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*
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* Revision 1.33 2001/08/21 13:48:01 jonashg
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* Added fix by HP to avoid oops when doing a hard_reset_now.
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*
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* Revision 1.32 2001/08/14 04:32:02 hp
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* In _resume, add comment why R9 is saved; don't sound like it's call-saved.
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*
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* Revision 1.31 2001/07/25 16:07:42 bjornw
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* softirq_active/mask -> softirq_pending only
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*
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* Revision 1.30 2001/07/05 01:03:32 hp
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* - include asm/errno.h to get ENOSYS.
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* - Use ENOSYS, not local constant LENOSYS; tweak comments.
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* - Explain why .include, not #include is used.
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* - Make oops-register-dump if watchdog bits and it's not expected.
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* - Don't jsr, use jump _hard_reset_now, and skip spurious nop.
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* - Use correct section attribute for section .rodata.
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* - Adjust sys_ni_syscall fill number.
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*
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* Revision 1.29 2001/06/25 14:07:00 hp
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* Fix review comment.
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* * head.S: Use IO_STATE, IO_FIELD and IO_MASK constructs instead of
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* magic numbers. Add comment that -traditional must not be used.
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* * entry.S (SYMBOL_NAME): Change redefinition to use ## concatenation.
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* Correct and update comment.
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* * Makefile (.S.o): Don't use -traditional. Add comment why the
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* toplevel rule can't be used (now that there's a reason).
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*
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* Revision 1.28 2001/06/21 02:00:40 hp
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* * entry.S: Include asm/unistd.h.
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* (_sys_call_table): Use section .rodata, not .data.
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* (_kernel_thread): Move from...
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* * process.c: ... here.
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* * entryoffsets.c (VAL): Break out from...
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* (OF): Use VAL.
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* (LCLONE_VM): New asmified value from CLONE_VM.
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*
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* Revision 1.27 2001/05/29 11:25:27 markusl
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* In case of "spurious_interrupt", do hard_reset instead of hanging system in a loop...
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*
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* Revision 1.26 2001/05/15 15:46:03 bjornw
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* Include config.h now that we use some CONFIG_ options
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*
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* Revision 1.25 2001/05/15 05:38:47 hp
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* Tweaked code in _ret_from_sys_call
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*
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* Revision 1.24 2001/05/15 05:27:49 hp
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* Save r9 in r1 over function call rather than on stack.
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*
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* Revision 1.23 2001/05/15 05:10:00 hp
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* Generate entry.S structure offsets from C
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*
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* Revision 1.22 2001/04/17 13:58:39 orjanf
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* * Renamed CONFIG_KGDB to CONFIG_ETRAX_KGDB.
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*
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* Revision 1.21 2001/04/17 11:33:29 orjanf
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* Updated according to review:
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* * Included asm/sv_addr_ag.h to get macro for internal register.
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* * Corrected comment regarding system call argument passing.
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* * Removed comment about instruction being in a delay slot.
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* * Added comment about SYMBOL_NAME macro.
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*
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* Revision 1.20 2001/04/12 08:51:07 hp
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* - Add entry for sys_fcntl64. In fact copy last piece from i386 including ...
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* - .rept to fill table to safe state with sys_ni_syscall.
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*
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* Revision 1.19 2001/04/04 09:43:32 orjanf
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* * Moved do_sigtrap from traps.c to entry.S.
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* * LTASK_PID need not be global anymore.
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*
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* Revision 1.18 2001/03/26 09:25:02 markusl
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* Updated after review, should now handle USB interrupts correctly.
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*
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* Revision 1.17 2001/03/21 16:12:55 bjornw
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* * Always make room for the cpu status record in the frame, in order to
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* use the same framelength and layout for both mmu busfaults and normal
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* irqs. No need to check for the explicit CRIS_FRAME_FIXUP type anymore.
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* * Fixed bug with using addq for popping the stack in the epilogue - it
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* destroyed the flag register. Use instructions that don't affect the
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* flag register instead.
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* * Removed write to R_PORT_PA_DATA during spurious_interrupt
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*
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* Revision 1.16 2001/03/20 19:43:02 bjornw
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* * Get rid of esp0 setting
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* * Give a 7th argument to a systemcall - the stackframe
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*
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* Revision 1.15 2001/03/05 13:14:30 bjornw
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* Spelling fix
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*
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* Revision 1.14 2001/02/23 08:36:36 perf
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* New ABI; syscallnr=r9, arg5=mof, arg6=srp.
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* Corrected tracesys call check.
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*
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* Revision 1.13 2001/02/15 08:40:55 perf
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* H-P by way of perf;
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* - (_system_call): Don't read system call function address into r1.
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* - (RBFExit): There is no such thing as a null pop. Adjust sp by addq.
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* - (_system_call): Don't use r10 and don't save and restore it.
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* - (THREAD_ESP0): New constant.
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* - (_system_call): Inline set_esp0.
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*
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* Revision 1.12 2001/01/31 17:56:25 orjanf
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* Added definition of LTASK_PID and made it global.
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*
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* Revision 1.11 2001/01/10 21:13:29 bjornw
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* SYMBOL_NAME is defined incorrectly for the compiler options we currently use
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*
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* Revision 1.10 2000/12/18 23:47:56 bjornw
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* * Added syscall trace support (ptrace), completely untested of course
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* * Removed redundant check for NULL entries in syscall_table
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*
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* Revision 1.9 2000/11/21 16:40:51 bjornw
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* * New frame type used when an SBFS frame needs to be popped without
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* actually restarting the instruction
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* * Enable interrupts in signal_return (they did so in x86, I hope it's a good
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* idea)
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*
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* Revision 1.8 2000/11/17 16:53:35 bjornw
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* Added detection of frame-type in Rexit, so that mmu_bus_fault can
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* use ret_from_intr in the return-path to check for signals (like SEGV)
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* and other foul things that might have occurred during the fault.
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*
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* Revision 1.7 2000/10/06 15:04:28 bjornw
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* Include mof in register savings
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*
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* Revision 1.6 2000/09/12 16:02:44 bjornw
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* Linux-2.4.0-test7 derived updates
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*
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* Revision 1.5 2000/08/17 15:35:15 bjornw
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* 2.4.0-test6 changed local_irq_count and friends API
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*
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* Revision 1.4 2000/08/02 13:59:30 bjornw
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* Removed olduname and uname from the syscall list
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*
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* Revision 1.3 2000/07/31 13:32:58 bjornw
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* * Export ret_from_intr
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* * _resume updated (prev/last tjohejsan)
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* * timer_interrupt obsolete
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* * SIGSEGV detection in mmu_bus_fault temporarily disabled
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*
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*
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*/
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/*
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* entry.S contains the system-call and fault low-level handling routines.
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*
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* NOTE: This code handles signal-recognition, which happens every time
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* after a timer-interrupt and after each system call.
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*
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* Stack layout in 'ret_from_system_call':
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* ptrace needs to have all regs on the stack.
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* if the order here is changed, it needs to be
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* updated in fork.c:copy_process, signal.c:do_signal,
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* ptrace.c and ptrace.h
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*
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*/
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#include <linux/linkage.h>
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#include <linux/sys.h>
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#include <asm/unistd.h>
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#include <asm/arch/sv_addr_ag.h>
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#include <asm/errno.h>
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#include <asm/thread_info.h>
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#include <asm/asm-offsets.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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;; functions exported from this file
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.globl system_call
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.globl ret_from_intr
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.globl ret_from_fork
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.globl resume
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.globl multiple_interrupt
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.globl hwbreakpoint
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.globl IRQ1_interrupt
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.globl spurious_interrupt
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.globl hw_bp_trigs
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.globl mmu_bus_fault
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.globl do_sigtrap
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.globl gdb_handle_breakpoint
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.globl sys_call_table
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;; below are various parts of system_call which are not in the fast-path
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#ifdef CONFIG_PREEMPT
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; Check if preemptive kernel scheduling should be done
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_resume_kernel:
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di
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; Load current task struct
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movs.w -8192, $r0 ; THREAD_SIZE = 8192
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and.d $sp, $r0
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move.d [$r0+TI_preempt_count], $r10 ; Preemption disabled?
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bne _Rexit
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nop
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_need_resched:
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move.d [$r0+TI_flags], $r10
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btstq TIF_NEED_RESCHED, $r10 ; Check if need_resched is set
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bpl _Rexit
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nop
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; Ok, lets's do some preemptive kernel scheduling
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jsr preempt_schedule_irq
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; Load new task struct
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movs.w -8192, $r0 ; THREAD_SIZE = 8192
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and.d $sp, $r0
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; One more time (with new task)
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ba _need_resched
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nop
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#else
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#define _resume_kernel _Rexit
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#endif
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; Called at exit from fork. schedule_tail must be called to drop
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; spinlock if CONFIG_PREEMPT
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ret_from_fork:
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jsr schedule_tail
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ba ret_from_sys_call
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nop
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ret_from_intr:
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;; check for resched if preemptive kernel or if we're going back to user-mode
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;; this test matches the user_regs(regs) macro
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;; we cannot simply test $dccr, because that does not necessarily
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;; reflect what mode we'll return into.
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move.d [$sp + PT_dccr], $r0; regs->dccr
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btstq 8, $r0 ; U-flag
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bpl _resume_kernel
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; Note that di below is in delay slot
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_resume_userspace:
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di ; so need_resched and sigpending don't change
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movs.w -8192, $r0 ; THREAD_SIZE == 8192
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and.d $sp, $r0
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move.d [$r0+TI_flags], $r10 ; current->work
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and.d _TIF_WORK_MASK, $r10 ; is there any work to be done on return
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bne _work_pending
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nop
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ba _Rexit
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nop
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;; The system_call is called by a BREAK instruction, which works like
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;; an interrupt call but it stores the return PC in BRP instead of IRP.
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;; Since we dont really want to have two epilogues (one for system calls
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;; and one for interrupts) we push the contents of BRP instead of IRP in the
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;; system call prologue, to make it look like an ordinary interrupt on the
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;; stackframe.
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;;
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;; Since we can't have system calls inside interrupts, it should not matter
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;; that we don't stack IRP.
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;;
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;; In r9 we have the wanted syscall number. Arguments come in r10,r11,r12,r13,mof,srp
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;;
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;; This function looks on the _surface_ like spaghetti programming, but it's
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;; really designed so that the fast-path does not force cache-loading of non-used
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;; instructions. Only the non-common cases cause the outlined code to run..
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system_call:
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;; stack-frame similar to the irq heads, which is reversed in ret_from_sys_call
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move $brp,[$sp=$sp-16]; instruction pointer and room for a fake SBFS frame
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push $srp
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push $dccr
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push $mof
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subq 14*4, $sp ; make room for r0-r13
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movem $r13, [$sp] ; push r0-r13
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push $r10 ; push orig_r10
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clear.d [$sp=$sp-4] ; frametype == 0, normal stackframe
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movs.w -ENOSYS, $r0
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move.d $r0, [$sp+PT_r10] ; put the default return value in r10 in the frame
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;; check if this process is syscall-traced
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movs.w -8192, $r0 ; THREAD_SIZE == 8192
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and.d $sp, $r0
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move.d [$r0+TI_flags], $r0
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btstq TIF_SYSCALL_TRACE, $r0
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bmi _syscall_trace_entry
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nop
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_syscall_traced:
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;; check for sanity in the requested syscall number
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cmpu.w NR_syscalls, $r9
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bcc ret_from_sys_call
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lslq 2, $r9 ; multiply by 4, in the delay slot
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;; as a bonus 7th parameter, we give the location on the stack
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;; of the register structure itself. some syscalls need this.
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push $sp
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;; the parameter carrying registers r10, r11, r12 and 13 are intact.
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;; the fifth and sixth parameters (if any) was in mof and srp
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;; respectively, and we need to put them on the stack.
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push $srp
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push $mof
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jsr [$r9+sys_call_table] ; actually do the system call
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addq 3*4, $sp ; pop the mof, srp and regs parameters
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move.d $r10, [$sp+PT_r10] ; save the return value
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moveq 1, $r9 ; "parameter" to ret_from_sys_call to show it was a sys call
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;; fall through into ret_from_sys_call to return
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ret_from_sys_call:
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;; r9 is a parameter - if >=1 we came from a syscall, if 0, from an irq
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;; get the current task-struct pointer (see top for defs)
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movs.w -8192, $r0 ; THREAD_SIZE == 8192
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and.d $sp, $r0
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di ; make sure need_resched and sigpending don't change
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move.d [$r0+TI_flags],$r1
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and.d _TIF_ALLWORK_MASK, $r1
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bne _syscall_exit_work
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nop
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|
|
_Rexit:
|
|
;; this epilogue MUST match the prologues in multiple_interrupt, irq.h and ptregs.h
|
|
pop $r10 ; frametype
|
|
bne _RBFexit ; was not CRIS_FRAME_NORMAL, handle otherwise
|
|
addq 4, $sp ; skip orig_r10, in delayslot
|
|
movem [$sp+], $r13 ; registers r0-r13
|
|
pop $mof ; multiply overflow register
|
|
pop $dccr ; condition codes
|
|
pop $srp ; subroutine return pointer
|
|
;; now we have a 4-word SBFS frame which we do not want to restore
|
|
;; using RBF since it was not stacked with SBFS. instead we would like to
|
|
;; just get the PC value to restart it with, and skip the rest of
|
|
;; the frame.
|
|
;; Also notice that it's important to use instructions here that
|
|
;; keep the interrupts disabled (since we've already popped DCCR)
|
|
move [$sp=$sp+16], $p8; pop the SBFS frame from the sp
|
|
jmpu [$sp-16] ; return through the irp field in the sbfs frame
|
|
|
|
_RBFexit:
|
|
movem [$sp+], $r13 ; registers r0-r13, in delay slot
|
|
pop $mof ; multiply overflow register
|
|
pop $dccr ; condition codes
|
|
pop $srp ; subroutine return pointer
|
|
rbf [$sp+] ; return by popping the CPU status
|
|
|
|
;; We get here after doing a syscall if extra work might need to be done
|
|
;; perform syscall exit tracing if needed
|
|
|
|
_syscall_exit_work:
|
|
;; $r0 contains current at this point and irq's are disabled
|
|
|
|
move.d [$r0+TI_flags], $r1
|
|
btstq TIF_SYSCALL_TRACE, $r1
|
|
bpl _work_pending
|
|
nop
|
|
|
|
ei
|
|
|
|
move.d $r9, $r1 ; preserve r9
|
|
jsr do_syscall_trace
|
|
move.d $r1, $r9
|
|
|
|
ba _resume_userspace
|
|
nop
|
|
|
|
_work_pending:
|
|
move.d [$r0+TI_flags], $r1
|
|
btstq TIF_NEED_RESCHED, $r1
|
|
bpl _work_notifysig ; was neither trace nor sched, must be signal/notify
|
|
nop
|
|
|
|
_work_resched:
|
|
move.d $r9, $r1 ; preserve r9
|
|
jsr schedule
|
|
move.d $r1, $r9
|
|
di
|
|
|
|
move.d [$r0+TI_flags], $r1
|
|
and.d _TIF_WORK_MASK, $r1; ignore the syscall trace counter
|
|
beq _Rexit
|
|
nop
|
|
btstq TIF_NEED_RESCHED, $r1
|
|
bmi _work_resched ; current->work.need_resched
|
|
nop
|
|
|
|
_work_notifysig:
|
|
;; deal with pending signals and notify-resume requests
|
|
|
|
move.d $r9, $r10 ; do_notify_resume syscall/irq param
|
|
move.d $sp, $r11 ; the regs param
|
|
move.d $r1, $r12 ; the thread_info_flags parameter
|
|
jsr do_notify_resume
|
|
|
|
ba _Rexit
|
|
nop
|
|
|
|
;; We get here as a sidetrack when we've entered a syscall with the
|
|
;; trace-bit set. We need to call do_syscall_trace and then continue
|
|
;; with the call.
|
|
|
|
_syscall_trace_entry:
|
|
;; PT_r10 in the frame contains -ENOSYS as required, at this point
|
|
|
|
jsr do_syscall_trace
|
|
|
|
;; now re-enter the syscall code to do the syscall itself
|
|
;; we need to restore $r9 here to contain the wanted syscall, and
|
|
;; the other parameter-bearing registers
|
|
|
|
move.d [$sp+PT_r9], $r9
|
|
move.d [$sp+PT_orig_r10], $r10 ; PT_r10 is already filled with -ENOSYS.
|
|
move.d [$sp+PT_r11], $r11
|
|
move.d [$sp+PT_r12], $r12
|
|
move.d [$sp+PT_r13], $r13
|
|
move [$sp+PT_mof], $mof
|
|
move [$sp+PT_srp], $srp
|
|
|
|
ba _syscall_traced
|
|
nop
|
|
|
|
;; resume performs the actual task-switching, by switching stack pointers
|
|
;; input arguments: r10 = prev, r11 = next, r12 = thread offset in task struct
|
|
;; returns old current in r10
|
|
;;
|
|
;; TODO: see the i386 version. The switch_to which calls resume in our version
|
|
;; could really be an inline asm of this.
|
|
|
|
resume:
|
|
push $srp ; we keep the old/new PC on the stack
|
|
add.d $r12, $r10 ; r10 = current tasks tss
|
|
move $dccr, [$r10+THREAD_dccr]; save irq enable state
|
|
di
|
|
|
|
move $usp, [$r10+ THREAD_usp] ; save user-mode stackpointer
|
|
|
|
;; See copy_thread for the reason why register R9 is saved.
|
|
subq 10*4, $sp
|
|
movem $r9, [$sp] ; save non-scratch registers and R9.
|
|
|
|
move.d $sp, [$r10+THREAD_ksp] ; save the kernel stack pointer for the old task
|
|
move.d $sp, $r10 ; return last running task in r10
|
|
and.d -8192, $r10 ; get thread_info from stackpointer
|
|
move.d [$r10+TI_task], $r10 ; get task
|
|
add.d $r12, $r11 ; find the new tasks tss
|
|
move.d [$r11+THREAD_ksp], $sp ; switch into the new stackframe by restoring kernel sp
|
|
|
|
movem [$sp+], $r9 ; restore non-scratch registers and R9.
|
|
|
|
move [$r11+THREAD_usp], $usp ; restore user-mode stackpointer
|
|
|
|
move [$r11+THREAD_dccr], $dccr ; restore irq enable status
|
|
jump [$sp+] ; restore PC
|
|
|
|
;; This is the MMU bus fault handler.
|
|
;; It needs to stack the CPU status and overall is different
|
|
;; from the other interrupt handlers.
|
|
|
|
mmu_bus_fault:
|
|
;; For refills we try to do a quick page table lookup. If it is
|
|
;; a real fault we let the mm subsystem handle it.
|
|
|
|
;; the first longword in the sbfs frame was the interrupted PC
|
|
;; which fits nicely with the "IRP" slot in pt_regs normally used to
|
|
;; contain the return address. used by Oops to print kernel errors.
|
|
sbfs [$sp=$sp-16] ; push the internal CPU status
|
|
push $dccr
|
|
di
|
|
subq 2*4, $sp
|
|
movem $r1, [$sp]
|
|
move.d [R_MMU_CAUSE], $r1
|
|
;; ETRAX 100LX TR89 bugfix: if the second half of an unaligned
|
|
;; write causes a MMU-fault, it will not be restarted correctly.
|
|
;; This could happen if a write crosses a page-boundary and the
|
|
;; second page is not yet COW'ed or even loaded. The workaround
|
|
;; is to clear the unaligned bit in the CPU status record, so
|
|
;; that the CPU will rerun both the first and second halves of
|
|
;; the instruction. This will not have any sideeffects unless
|
|
;; the first half goes to any device or memory that can't be
|
|
;; written twice, and which is mapped through the MMU.
|
|
;;
|
|
;; We only need to do this for writes.
|
|
btstq 8, $r1 ; Write access?
|
|
bpl 1f
|
|
nop
|
|
move.d [$sp+16], $r0 ; Clear unaligned bit in csrinstr
|
|
and.d ~(1<<5), $r0
|
|
move.d $r0, [$sp+16]
|
|
1: btstq 12, $r1 ; Refill?
|
|
bpl 2f
|
|
lsrq 24, $r1 ; Get PGD index (bit 24-31)
|
|
move.d [per_cpu__current_pgd], $r0 ; PGD for the current process
|
|
move.d [$r0+$r1.d], $r0 ; Get PMD
|
|
beq 2f
|
|
nop
|
|
and.w PAGE_MASK, $r0 ; Remove PMD flags
|
|
move.d [R_MMU_CAUSE], $r1
|
|
lsrq PAGE_SHIFT, $r1
|
|
and.d 0x7ff, $r1 ; Get PTE index into PGD (bit 13-23)
|
|
move.d [$r0+$r1.d], $r1 ; Get PTE
|
|
beq 2f
|
|
nop
|
|
;; Store in TLB
|
|
move.d $r1, [R_TLB_LO]
|
|
;; Return
|
|
movem [$sp+], $r1
|
|
pop $dccr
|
|
rbf [$sp+] ; return by popping the CPU status
|
|
|
|
2: ; PMD or PTE missing, let the mm subsystem fix it up.
|
|
movem [$sp+], $r1
|
|
pop $dccr
|
|
|
|
; Ok, not that easy, pass it on to the mm subsystem
|
|
; The MMU status record is now on the stack
|
|
push $srp ; make a stackframe similar to pt_regs
|
|
push $dccr
|
|
push $mof
|
|
di
|
|
subq 14*4, $sp
|
|
movem $r13, [$sp]
|
|
push $r10 ; dummy orig_r10
|
|
moveq 1, $r10
|
|
push $r10 ; frametype == 1, BUSFAULT frame type
|
|
|
|
move.d $sp, $r10 ; pt_regs argument to handle_mmu_bus_fault
|
|
|
|
jsr handle_mmu_bus_fault ; in arch/cris/arch-v10/mm/fault.c
|
|
|
|
;; now we need to return through the normal path, we cannot just
|
|
;; do the RBFexit since we might have killed off the running
|
|
;; process due to a SEGV, scheduled due to a page blocking or
|
|
;; whatever.
|
|
|
|
moveq 0, $r9 ; busfault is equivalent to an irq
|
|
|
|
ba ret_from_intr
|
|
nop
|
|
|
|
;; special handlers for breakpoint and NMI
|
|
hwbreakpoint:
|
|
push $dccr
|
|
di
|
|
push $r10
|
|
push $r11
|
|
move.d [hw_bp_trig_ptr],$r10
|
|
move $brp,$r11
|
|
move.d $r11,[$r10+]
|
|
move.d $r10,[hw_bp_trig_ptr]
|
|
1: pop $r11
|
|
pop $r10
|
|
pop $dccr
|
|
retb
|
|
nop
|
|
|
|
IRQ1_interrupt:
|
|
;; this prologue MUST match the one in irq.h and the struct in ptregs.h!!!
|
|
move $brp,[$sp=$sp-16]; instruction pointer and room for a fake SBFS frame
|
|
push $srp
|
|
push $dccr
|
|
push $mof
|
|
di
|
|
subq 14*4, $sp
|
|
movem $r13, [$sp]
|
|
push $r10 ; push orig_r10
|
|
clear.d [$sp=$sp-4] ; frametype == 0, normal frame
|
|
|
|
;; If there is a glitch on the NMI pin shorter than ~100ns
|
|
;; (i.e. non-active by the time we get here) then the nmi_pin bit
|
|
;; in R_IRQ_MASK0_RD will already be cleared. The watchdog_nmi bit
|
|
;; is cleared by us however (when feeding the watchdog), which is why
|
|
;; we use that bit to determine what brought us here.
|
|
|
|
move.d [R_IRQ_MASK0_RD], $r1 ; External NMI or watchdog?
|
|
and.d (1<<30), $r1
|
|
bne wdog
|
|
move.d $sp, $r10
|
|
jsr handle_nmi
|
|
setf m ; Enable NMI again
|
|
ba _Rexit ; Return the standard way
|
|
nop
|
|
wdog:
|
|
#if defined(CONFIG_ETRAX_WATCHDOG) && !defined(CONFIG_SVINTO_SIM)
|
|
;; Check if we're waiting for reset to happen, as signalled by
|
|
;; hard_reset_now setting cause_of_death to a magic value. If so, just
|
|
;; get stuck until reset happens.
|
|
.comm cause_of_death, 4 ;; Don't declare this anywhere.
|
|
move.d [cause_of_death], $r10
|
|
cmp.d 0xbedead, $r10
|
|
_killed_by_death:
|
|
beq _killed_by_death
|
|
nop
|
|
|
|
;; We'll see this in ksymoops dumps.
|
|
Watchdog_bite:
|
|
|
|
#ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY
|
|
;; We just restart the watchdog here to be sure we dont get
|
|
;; hit while printing the watchdogmsg below
|
|
;; This restart is compatible with the rest of the C-code, so
|
|
;; the C-code can keep restarting the watchdog after this point.
|
|
;; The non-NICE_DOGGY code below though, disables the possibility
|
|
;; to restart since it changes the watchdog key, to avoid any
|
|
;; buggy loops etc. keeping the watchdog alive after this.
|
|
jsr reset_watchdog
|
|
#else
|
|
|
|
;; We need to extend the 3.3ms after the NMI at watchdog bite, so we have
|
|
;; time for an oops-dump over a 115k2 serial wire. Another 100ms should do.
|
|
|
|
;; Change the watchdog key to an arbitrary 3-bit value and restart the
|
|
;; watchdog.
|
|
#define WD_INIT 2
|
|
moveq IO_FIELD (R_WATCHDOG, key, WD_INIT), $r10
|
|
move.d R_WATCHDOG, $r11
|
|
|
|
move.d $r10, [$r11]
|
|
moveq IO_FIELD (R_WATCHDOG, key, \
|
|
IO_EXTRACT (R_WATCHDOG, key, \
|
|
IO_MASK (R_WATCHDOG, key)) \
|
|
^ WD_INIT) \
|
|
| IO_STATE (R_WATCHDOG, enable, start), $r10
|
|
move.d $r10, [$r11]
|
|
|
|
#endif
|
|
|
|
;; Note that we don't do "setf m" here (or after two necessary NOPs),
|
|
;; since *not* doing that saves us from re-entrancy checks. We don't want
|
|
;; to get here again due to possible subsequent NMIs; we want the watchdog
|
|
;; to reset us.
|
|
|
|
move.d _watchdogmsg,$r10
|
|
jsr printk
|
|
|
|
move.d $sp, $r10
|
|
jsr watchdog_bite_hook
|
|
|
|
;; This nop is here so we see the "Watchdog_bite" label in ksymoops dumps
|
|
;; rather than "spurious_interrupt".
|
|
nop
|
|
;; At this point we drop down into spurious_interrupt, which will do a
|
|
;; hard reset.
|
|
|
|
.section .rodata,"a"
|
|
_watchdogmsg:
|
|
.ascii "Oops: bitten by watchdog\n\0"
|
|
.previous
|
|
|
|
#endif /* CONFIG_ETRAX_WATCHDOG and not CONFIG_SVINTO_SIM */
|
|
|
|
spurious_interrupt:
|
|
di
|
|
jump hard_reset_now
|
|
|
|
;; this handles the case when multiple interrupts arrive at the same time
|
|
;; we jump to the first set interrupt bit in a priority fashion
|
|
;; the hardware will call the unserved interrupts after the handler finishes
|
|
|
|
multiple_interrupt:
|
|
;; this prologue MUST match the one in irq.h and the struct in ptregs.h!!!
|
|
move $irp,[$sp=$sp-16]; instruction pointer and room for a fake SBFS frame
|
|
push $srp
|
|
push $dccr
|
|
push $mof
|
|
di
|
|
subq 14*4, $sp
|
|
movem $r13, [$sp]
|
|
push $r10 ; push orig_r10
|
|
clear.d [$sp=$sp-4] ; frametype == 0, normal frame
|
|
|
|
move.d $sp, $r10
|
|
jsr do_multiple_IRQ
|
|
|
|
jump ret_from_intr
|
|
|
|
do_sigtrap:
|
|
;;
|
|
;; SIGTRAP the process that executed the break instruction.
|
|
;; Make a frame that Rexit in entry.S expects.
|
|
;;
|
|
move $brp, [$sp=$sp-16] ; Push BRP while faking a cpu status record.
|
|
push $srp ; Push subroutine return pointer.
|
|
push $dccr ; Push condition codes.
|
|
push $mof ; Push multiply overflow reg.
|
|
di ; Need to disable irq's at this point.
|
|
subq 14*4, $sp ; Make room for r0-r13.
|
|
movem $r13, [$sp] ; Push the r0-r13 registers.
|
|
push $r10 ; Push orig_r10.
|
|
clear.d [$sp=$sp-4] ; Frametype - this is a normal stackframe.
|
|
|
|
movs.w -8192,$r9 ; THREAD_SIZE == 8192
|
|
and.d $sp, $r9
|
|
move.d [$r9+TI_task], $r10
|
|
move.d [$r10+TASK_pid], $r10 ; current->pid as arg1.
|
|
moveq 5, $r11 ; SIGTRAP as arg2.
|
|
jsr sys_kill
|
|
jump ret_from_intr ; Use the return routine for interrupts.
|
|
|
|
gdb_handle_breakpoint:
|
|
push $dccr
|
|
push $r0
|
|
#ifdef CONFIG_ETRAX_KGDB
|
|
move $dccr, $r0 ; U-flag not affected by previous insns.
|
|
btstq 8, $r0 ; Test the U-flag.
|
|
bmi _ugdb_handle_breakpoint ; Go to user mode debugging.
|
|
nop ; Empty delay slot (cannot pop r0 here).
|
|
pop $r0 ; Restore r0.
|
|
ba kgdb_handle_breakpoint ; Go to kernel debugging.
|
|
pop $dccr ; Restore dccr in delay slot.
|
|
#endif
|
|
|
|
_ugdb_handle_breakpoint:
|
|
move $brp, $r0 ; Use r0 temporarily for calculation.
|
|
subq 2, $r0 ; Set to address of previous instruction.
|
|
move $r0, $brp
|
|
pop $r0 ; Restore r0.
|
|
ba do_sigtrap ; SIGTRAP the offending process.
|
|
pop $dccr ; Restore dccr in delay slot.
|
|
|
|
.global kernel_execve
|
|
kernel_execve:
|
|
move.d __NR_execve, $r9
|
|
break 13
|
|
ret
|
|
nop
|
|
|
|
.data
|
|
|
|
hw_bp_trigs:
|
|
.space 64*4
|
|
hw_bp_trig_ptr:
|
|
.dword hw_bp_trigs
|
|
|
|
.section .rodata,"a"
|
|
sys_call_table:
|
|
.long sys_restart_syscall /* 0 - old "setup()" system call, used for restarting */
|
|
.long sys_exit
|
|
.long sys_fork
|
|
.long sys_read
|
|
.long sys_write
|
|
.long sys_open /* 5 */
|
|
.long sys_close
|
|
.long sys_waitpid
|
|
.long sys_creat
|
|
.long sys_link
|
|
.long sys_unlink /* 10 */
|
|
.long sys_execve
|
|
.long sys_chdir
|
|
.long sys_time
|
|
.long sys_mknod
|
|
.long sys_chmod /* 15 */
|
|
.long sys_lchown16
|
|
.long sys_ni_syscall /* old break syscall holder */
|
|
.long sys_stat
|
|
.long sys_lseek
|
|
.long sys_getpid /* 20 */
|
|
.long sys_mount
|
|
.long sys_oldumount
|
|
.long sys_setuid16
|
|
.long sys_getuid16
|
|
.long sys_stime /* 25 */
|
|
.long sys_ptrace
|
|
.long sys_alarm
|
|
.long sys_fstat
|
|
.long sys_pause
|
|
.long sys_utime /* 30 */
|
|
.long sys_ni_syscall /* old stty syscall holder */
|
|
.long sys_ni_syscall /* old gtty syscall holder */
|
|
.long sys_access
|
|
.long sys_nice
|
|
.long sys_ni_syscall /* 35 old ftime syscall holder */
|
|
.long sys_sync
|
|
.long sys_kill
|
|
.long sys_rename
|
|
.long sys_mkdir
|
|
.long sys_rmdir /* 40 */
|
|
.long sys_dup
|
|
.long sys_pipe
|
|
.long sys_times
|
|
.long sys_ni_syscall /* old prof syscall holder */
|
|
.long sys_brk /* 45 */
|
|
.long sys_setgid16
|
|
.long sys_getgid16
|
|
.long sys_signal
|
|
.long sys_geteuid16
|
|
.long sys_getegid16 /* 50 */
|
|
.long sys_acct
|
|
.long sys_umount /* recycled never used phys( */
|
|
.long sys_ni_syscall /* old lock syscall holder */
|
|
.long sys_ioctl
|
|
.long sys_fcntl /* 55 */
|
|
.long sys_ni_syscall /* old mpx syscall holder */
|
|
.long sys_setpgid
|
|
.long sys_ni_syscall /* old ulimit syscall holder */
|
|
.long sys_ni_syscall /* old sys_olduname holder */
|
|
.long sys_umask /* 60 */
|
|
.long sys_chroot
|
|
.long sys_ustat
|
|
.long sys_dup2
|
|
.long sys_getppid
|
|
.long sys_getpgrp /* 65 */
|
|
.long sys_setsid
|
|
.long sys_sigaction
|
|
.long sys_sgetmask
|
|
.long sys_ssetmask
|
|
.long sys_setreuid16 /* 70 */
|
|
.long sys_setregid16
|
|
.long sys_sigsuspend
|
|
.long sys_sigpending
|
|
.long sys_sethostname
|
|
.long sys_setrlimit /* 75 */
|
|
.long sys_old_getrlimit
|
|
.long sys_getrusage
|
|
.long sys_gettimeofday
|
|
.long sys_settimeofday
|
|
.long sys_getgroups16 /* 80 */
|
|
.long sys_setgroups16
|
|
.long sys_select /* was old_select in Linux/E100 */
|
|
.long sys_symlink
|
|
.long sys_lstat
|
|
.long sys_readlink /* 85 */
|
|
.long sys_uselib
|
|
.long sys_swapon
|
|
.long sys_reboot
|
|
.long old_readdir
|
|
.long old_mmap /* 90 */
|
|
.long sys_munmap
|
|
.long sys_truncate
|
|
.long sys_ftruncate
|
|
.long sys_fchmod
|
|
.long sys_fchown16 /* 95 */
|
|
.long sys_getpriority
|
|
.long sys_setpriority
|
|
.long sys_ni_syscall /* old profil syscall holder */
|
|
.long sys_statfs
|
|
.long sys_fstatfs /* 100 */
|
|
.long sys_ni_syscall /* sys_ioperm in i386 */
|
|
.long sys_socketcall
|
|
.long sys_syslog
|
|
.long sys_setitimer
|
|
.long sys_getitimer /* 105 */
|
|
.long sys_newstat
|
|
.long sys_newlstat
|
|
.long sys_newfstat
|
|
.long sys_ni_syscall /* old sys_uname holder */
|
|
.long sys_ni_syscall /* sys_iopl in i386 */
|
|
.long sys_vhangup
|
|
.long sys_ni_syscall /* old "idle" system call */
|
|
.long sys_ni_syscall /* vm86old in i386 */
|
|
.long sys_wait4
|
|
.long sys_swapoff /* 115 */
|
|
.long sys_sysinfo
|
|
.long sys_ipc
|
|
.long sys_fsync
|
|
.long sys_sigreturn
|
|
.long sys_clone /* 120 */
|
|
.long sys_setdomainname
|
|
.long sys_newuname
|
|
.long sys_ni_syscall /* sys_modify_ldt */
|
|
.long sys_adjtimex
|
|
.long sys_mprotect /* 125 */
|
|
.long sys_sigprocmask
|
|
.long sys_ni_syscall /* old "create_module" */
|
|
.long sys_init_module
|
|
.long sys_delete_module
|
|
.long sys_ni_syscall /* 130: old "get_kernel_syms" */
|
|
.long sys_quotactl
|
|
.long sys_getpgid
|
|
.long sys_fchdir
|
|
.long sys_bdflush
|
|
.long sys_sysfs /* 135 */
|
|
.long sys_personality
|
|
.long sys_ni_syscall /* for afs_syscall */
|
|
.long sys_setfsuid16
|
|
.long sys_setfsgid16
|
|
.long sys_llseek /* 140 */
|
|
.long sys_getdents
|
|
.long sys_select
|
|
.long sys_flock
|
|
.long sys_msync
|
|
.long sys_readv /* 145 */
|
|
.long sys_writev
|
|
.long sys_getsid
|
|
.long sys_fdatasync
|
|
.long sys_sysctl
|
|
.long sys_mlock /* 150 */
|
|
.long sys_munlock
|
|
.long sys_mlockall
|
|
.long sys_munlockall
|
|
.long sys_sched_setparam
|
|
.long sys_sched_getparam /* 155 */
|
|
.long sys_sched_setscheduler
|
|
.long sys_sched_getscheduler
|
|
.long sys_sched_yield
|
|
.long sys_sched_get_priority_max
|
|
.long sys_sched_get_priority_min /* 160 */
|
|
.long sys_sched_rr_get_interval
|
|
.long sys_nanosleep
|
|
.long sys_mremap
|
|
.long sys_setresuid16
|
|
.long sys_getresuid16 /* 165 */
|
|
.long sys_ni_syscall /* sys_vm86 */
|
|
.long sys_ni_syscall /* Old sys_query_module */
|
|
.long sys_poll
|
|
.long sys_nfsservctl
|
|
.long sys_setresgid16 /* 170 */
|
|
.long sys_getresgid16
|
|
.long sys_prctl
|
|
.long sys_rt_sigreturn
|
|
.long sys_rt_sigaction
|
|
.long sys_rt_sigprocmask /* 175 */
|
|
.long sys_rt_sigpending
|
|
.long sys_rt_sigtimedwait
|
|
.long sys_rt_sigqueueinfo
|
|
.long sys_rt_sigsuspend
|
|
.long sys_pread64 /* 180 */
|
|
.long sys_pwrite64
|
|
.long sys_chown16
|
|
.long sys_getcwd
|
|
.long sys_capget
|
|
.long sys_capset /* 185 */
|
|
.long sys_sigaltstack
|
|
.long sys_sendfile
|
|
.long sys_ni_syscall /* streams1 */
|
|
.long sys_ni_syscall /* streams2 */
|
|
.long sys_vfork /* 190 */
|
|
.long sys_getrlimit
|
|
.long sys_mmap2
|
|
.long sys_truncate64
|
|
.long sys_ftruncate64
|
|
.long sys_stat64 /* 195 */
|
|
.long sys_lstat64
|
|
.long sys_fstat64
|
|
.long sys_lchown
|
|
.long sys_getuid
|
|
.long sys_getgid /* 200 */
|
|
.long sys_geteuid
|
|
.long sys_getegid
|
|
.long sys_setreuid
|
|
.long sys_setregid
|
|
.long sys_getgroups /* 205 */
|
|
.long sys_setgroups
|
|
.long sys_fchown
|
|
.long sys_setresuid
|
|
.long sys_getresuid
|
|
.long sys_setresgid /* 210 */
|
|
.long sys_getresgid
|
|
.long sys_chown
|
|
.long sys_setuid
|
|
.long sys_setgid
|
|
.long sys_setfsuid /* 215 */
|
|
.long sys_setfsgid
|
|
.long sys_pivot_root
|
|
.long sys_mincore
|
|
.long sys_madvise
|
|
.long sys_getdents64 /* 220 */
|
|
.long sys_fcntl64
|
|
.long sys_ni_syscall /* reserved for TUX */
|
|
.long sys_ni_syscall
|
|
.long sys_gettid
|
|
.long sys_readahead /* 225 */
|
|
.long sys_setxattr
|
|
.long sys_lsetxattr
|
|
.long sys_fsetxattr
|
|
.long sys_getxattr
|
|
.long sys_lgetxattr /* 230 */
|
|
.long sys_fgetxattr
|
|
.long sys_listxattr
|
|
.long sys_llistxattr
|
|
.long sys_flistxattr
|
|
.long sys_removexattr /* 235 */
|
|
.long sys_lremovexattr
|
|
.long sys_fremovexattr
|
|
.long sys_tkill
|
|
.long sys_sendfile64
|
|
.long sys_futex /* 240 */
|
|
.long sys_sched_setaffinity
|
|
.long sys_sched_getaffinity
|
|
.long sys_ni_syscall /* sys_set_thread_area */
|
|
.long sys_ni_syscall /* sys_get_thread_area */
|
|
.long sys_io_setup /* 245 */
|
|
.long sys_io_destroy
|
|
.long sys_io_getevents
|
|
.long sys_io_submit
|
|
.long sys_io_cancel
|
|
.long sys_fadvise64 /* 250 */
|
|
.long sys_ni_syscall
|
|
.long sys_exit_group
|
|
.long sys_lookup_dcookie
|
|
.long sys_epoll_create
|
|
.long sys_epoll_ctl /* 255 */
|
|
.long sys_epoll_wait
|
|
.long sys_remap_file_pages
|
|
.long sys_set_tid_address
|
|
.long sys_timer_create
|
|
.long sys_timer_settime /* 260 */
|
|
.long sys_timer_gettime
|
|
.long sys_timer_getoverrun
|
|
.long sys_timer_delete
|
|
.long sys_clock_settime
|
|
.long sys_clock_gettime /* 265 */
|
|
.long sys_clock_getres
|
|
.long sys_clock_nanosleep
|
|
.long sys_statfs64
|
|
.long sys_fstatfs64
|
|
.long sys_tgkill /* 270 */
|
|
.long sys_utimes
|
|
.long sys_fadvise64_64
|
|
.long sys_ni_syscall /* sys_vserver */
|
|
.long sys_ni_syscall /* sys_mbind */
|
|
.long sys_ni_syscall /* 275 sys_get_mempolicy */
|
|
.long sys_ni_syscall /* sys_set_mempolicy */
|
|
.long sys_mq_open
|
|
.long sys_mq_unlink
|
|
.long sys_mq_timedsend
|
|
.long sys_mq_timedreceive /* 280 */
|
|
.long sys_mq_notify
|
|
.long sys_mq_getsetattr
|
|
.long sys_ni_syscall /* reserved for kexec */
|
|
.long sys_waitid
|
|
.long sys_ni_syscall /* 285 */ /* available */
|
|
.long sys_add_key
|
|
.long sys_request_key
|
|
.long sys_keyctl
|
|
.long sys_ioprio_set
|
|
.long sys_ioprio_get /* 290 */
|
|
.long sys_inotify_init
|
|
.long sys_inotify_add_watch
|
|
.long sys_inotify_rm_watch
|
|
.long sys_migrate_pages
|
|
.long sys_openat /* 295 */
|
|
.long sys_mkdirat
|
|
.long sys_mknodat
|
|
.long sys_fchownat
|
|
.long sys_futimesat
|
|
.long sys_fstatat64 /* 300 */
|
|
.long sys_unlinkat
|
|
.long sys_renameat
|
|
.long sys_linkat
|
|
.long sys_symlinkat
|
|
.long sys_readlinkat /* 305 */
|
|
.long sys_fchmodat
|
|
.long sys_faccessat
|
|
.long sys_pselect6
|
|
.long sys_ppoll
|
|
.long sys_unshare /* 310 */
|
|
.long sys_set_robust_list
|
|
.long sys_get_robust_list
|
|
.long sys_splice
|
|
.long sys_sync_file_range
|
|
.long sys_tee /* 315 */
|
|
.long sys_vmsplice
|
|
.long sys_move_pages
|
|
.long sys_getcpu
|
|
.long sys_epoll_pwait
|
|
.long sys_utimensat /* 320 */
|
|
.long sys_signalfd
|
|
.long sys_timerfd
|
|
.long sys_eventfd
|
|
.long sys_fallocate
|
|
|
|
/*
|
|
* NOTE!! This doesn't have to be exact - we just have
|
|
* to make sure we have _enough_ of the "sys_ni_syscall"
|
|
* entries. Don't panic if you notice that this hasn't
|
|
* been shrunk every time we add a new system call.
|
|
*/
|
|
|
|
.rept NR_syscalls-(.-sys_call_table)/4
|
|
.long sys_ni_syscall
|
|
.endr
|
|
|