2019-06-04 08:11:33 +00:00
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/* SPDX-License-Identifier: GPL-2.0-only */
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2013-01-18 09:42:18 +00:00
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/*
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2015-02-21 09:39:32 +00:00
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* Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
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2013-01-18 09:42:18 +00:00
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*/
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#ifndef __ASM_ARC_ENTRY_H
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#define __ASM_ARC_ENTRY_H
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#include <asm/unistd.h> /* For NR_syscalls defination */
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#include <asm/arcregs.h>
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#include <asm/ptrace.h>
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2013-02-11 14:22:57 +00:00
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#include <asm/processor.h> /* For VMALLOC_START */
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2013-07-26 22:29:40 +00:00
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#include <asm/mmu.h>
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2013-01-18 09:42:18 +00:00
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2023-08-13 01:23:59 +00:00
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#ifdef __ASSEMBLY__
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ARCv2: Support for ARCv2 ISA and HS38x cores
The notable features are:
- SMP configurations of upto 4 cores with coherency
- Optional L2 Cache and IO-Coherency
- Revised Interrupt Architecture (multiple priorites, reg banks,
auto stack switch, auto regfile save/restore)
- MMUv4 (PIPT dcache, Huge Pages)
- Instructions for
* 64bit load/store: LDD, STD
* Hardware assisted divide/remainder: DIV, REM
* Function prologue/epilogue: ENTER_S, LEAVE_S
* IRQ enable/disable: CLRI, SETI
* pop count: FFS, FLS
* SETcc, BMSKN, XBFU...
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-05-13 13:00:41 +00:00
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#ifdef CONFIG_ISA_ARCOMPACT
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2015-02-21 09:39:32 +00:00
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#include <asm/entry-compact.h> /* ISA specific bits */
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ARCv2: Support for ARCv2 ISA and HS38x cores
The notable features are:
- SMP configurations of upto 4 cores with coherency
- Optional L2 Cache and IO-Coherency
- Revised Interrupt Architecture (multiple priorites, reg banks,
auto stack switch, auto regfile save/restore)
- MMUv4 (PIPT dcache, Huge Pages)
- Instructions for
* 64bit load/store: LDD, STD
* Hardware assisted divide/remainder: DIV, REM
* Function prologue/epilogue: ENTER_S, LEAVE_S
* IRQ enable/disable: CLRI, SETI
* pop count: FFS, FLS
* SETcc, BMSKN, XBFU...
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-05-13 13:00:41 +00:00
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#else
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#include <asm/entry-arcv2.h>
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#endif
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2015-02-21 09:39:32 +00:00
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2013-01-18 09:42:18 +00:00
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/* Note on the LD/ST addr modes with addr reg wback
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*
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* LD.a same as LD.aw
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*
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* LD.a reg1, [reg2, x] => Pre Incr
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* Eff Addr for load = [reg2 + x]
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*
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* LD.ab reg1, [reg2, x] => Post Incr
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* Eff Addr for load = [reg2]
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*/
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2013-05-28 07:54:43 +00:00
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.macro PUSH reg
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st.a \reg, [sp, -4]
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.endm
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.macro PUSHAX aux
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lr r9, [\aux]
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PUSH r9
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.endm
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.macro POP reg
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ld.ab \reg, [sp, 4]
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.endm
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.macro POPAX aux
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POP r9
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sr r9, [\aux]
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.endm
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2013-01-18 09:42:18 +00:00
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/*--------------------------------------------------------------
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2013-05-28 07:54:43 +00:00
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* Helpers to save/restore Scratch Regs:
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* used by Interrupt/Exception Prologue/Epilogue
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2013-01-18 09:42:18 +00:00
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*-------------------------------------------------------------*/
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2013-05-28 07:54:43 +00:00
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.macro SAVE_R0_TO_R12
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PUSH r0
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PUSH r1
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PUSH r2
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PUSH r3
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PUSH r4
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PUSH r5
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PUSH r6
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PUSH r7
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PUSH r8
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PUSH r9
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PUSH r10
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PUSH r11
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PUSH r12
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.endm
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.macro RESTORE_R12_TO_R0
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POP r12
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POP r11
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POP r10
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POP r9
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POP r8
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POP r7
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POP r6
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POP r5
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POP r4
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POP r3
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POP r2
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POP r1
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POP r0
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ARC: pt_regs update #4: r25 saved/restored unconditionally
(This is a VERY IMP change for low level interrupt/exception handling)
-----------------------------------------------------------------------
WHAT
-----------------------------------------------------------------------
* User 25 now saved in pt_regs->user_r25 (vs. tsk->thread_info.user_r25)
* This allows Low level interrupt code to unconditionally save r25
(vs. the prev version which would only do it for U->K transition).
Ofcourse for nested interrupts, only the pt_regs->user_r25 of
bottom-most frame is useful.
* simplifies the interrupt prologue/epilogue
* Needed for ARCv2 ISA code and done here to keep design similar with
ARCompact event handling
-----------------------------------------------------------------------
WHY
-------------------------------------------------------------------------
With CONFIG_ARC_CURR_IN_REG, r25 is used to cache "current" task pointer
in kernel mode. So when entering kernel mode from User Mode
- user r25 is specially safe-kept (it being a callee reg is NOT part of
pt_regs which are saved by default on each interrupt/trap/exception)
- r25 loaded with current task pointer.
Further, if interrupt was taken in kernel mode, this is skipped since we
know that r25 already has valid "current" pointer.
With 2 level of interrupts in ARCompact ISA, detecting this is difficult
but still possible, since we could be in kernel mode but r25 not already saved
(in fact the stack itself might not have been switched).
A. User mode
B. L1 IRQ taken
C. L2 IRQ taken (while on 1st line of L1 ISR)
So in #C, although in kernel mode, r25 not saved (infact SP not
switched at all)
Given that ARcompact has manual stack switching, we could use a bit of
trickey - The low level code would make sure that SP is only set to kernel
mode value at the very end (after saving r25). So a non kernel mode SP,
even if in kernel mode, meant r25 was NOT saved.
The same paradigm won't work in ARCv2 ISA since SP is auto-switched so
it's setting can't be delayed/constrained.
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-05-28 08:20:41 +00:00
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2013-01-18 09:42:18 +00:00
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.endm
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/*--------------------------------------------------------------
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2013-05-28 07:54:43 +00:00
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* Helpers to save/restore callee-saved regs:
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* used by several macros below
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2013-01-18 09:42:18 +00:00
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*-------------------------------------------------------------*/
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2020-05-13 05:18:08 +00:00
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.macro SAVE_R13_TO_R25
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2013-05-28 07:54:43 +00:00
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PUSH r13
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PUSH r14
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PUSH r15
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PUSH r16
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PUSH r17
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PUSH r18
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PUSH r19
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PUSH r20
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PUSH r21
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PUSH r22
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PUSH r23
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PUSH r24
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2020-05-13 05:18:08 +00:00
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PUSH r25
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2013-05-28 07:54:43 +00:00
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.endm
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2020-05-13 05:18:08 +00:00
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.macro RESTORE_R25_TO_R13
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POP r25
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2013-05-28 07:54:43 +00:00
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POP r24
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POP r23
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POP r22
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POP r21
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POP r20
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POP r19
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POP r18
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POP r17
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POP r16
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POP r15
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POP r14
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POP r13
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2013-01-18 09:42:18 +00:00
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.endm
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2020-05-13 05:18:08 +00:00
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/*
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* save user mode callee regs as struct callee_regs
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* - needed by fork/do_signal/unaligned-access-emulation.
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*/
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2013-01-18 09:42:18 +00:00
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.macro SAVE_CALLEE_SAVED_USER
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2020-05-13 05:18:08 +00:00
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SAVE_R13_TO_R25
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.endm
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2013-05-28 07:54:43 +00:00
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2020-05-13 05:18:08 +00:00
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/*
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* restore user mode callee regs as struct callee_regs
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* - could have been changed by ptrace tracer or unaligned-access fixup
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*/
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.macro RESTORE_CALLEE_SAVED_USER
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RESTORE_R25_TO_R13
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2013-01-18 09:42:18 +00:00
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.endm
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2020-05-13 05:18:08 +00:00
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/*
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* save/restore kernel mode callee regs at the time of context switch
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*/
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2013-01-18 09:42:18 +00:00
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.macro SAVE_CALLEE_SAVED_KERNEL
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2020-05-13 05:18:08 +00:00
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SAVE_R13_TO_R25
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2013-01-18 09:42:18 +00:00
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.endm
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.macro RESTORE_CALLEE_SAVED_KERNEL
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2020-05-13 05:18:08 +00:00
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RESTORE_R25_TO_R13
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2013-01-18 09:42:19 +00:00
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.endm
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2013-01-18 09:42:18 +00:00
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/*--------------------------------------------------------------
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* Super FAST Restore callee saved regs by simply re-adjusting SP
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*-------------------------------------------------------------*/
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.macro DISCARD_CALLEE_SAVED_USER
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2013-05-27 16:13:41 +00:00
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add sp, sp, SZ_CALLEE_REGS
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2013-01-18 09:42:18 +00:00
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.endm
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/*-------------------------------------------------------------
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* given a tsk struct, get to the base of it's kernel mode stack
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* tsk->thread_info is really a PAGE, whose bottom hoists stack
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* which grows upwards towards thread_info
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*------------------------------------------------------------*/
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.macro GET_TSK_STACK_BASE tsk, out
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/* Get task->thread_info (this is essentially start of a PAGE) */
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ld \out, [\tsk, TASK_THREAD_INFO]
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/* Go to end of page where stack begins (grows upwards) */
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2013-05-28 04:04:45 +00:00
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add2 \out, \out, (THREAD_SIZE)/4
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2013-01-18 09:42:18 +00:00
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.endm
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/*
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* @reg [OUT] thread_info->flags of "current"
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*/
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.macro GET_CURR_THR_INFO_FLAGS reg
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GET_CURR_THR_INFO_FROM_SP \reg
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ld \reg, [\reg, THREAD_INFO_FLAGS]
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.endm
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2013-01-18 09:42:23 +00:00
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#ifdef CONFIG_SMP
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2020-05-13 05:18:08 +00:00
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/*
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2013-01-18 09:42:23 +00:00
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* Retrieve the current running task on this CPU
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2020-05-13 05:18:08 +00:00
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* - loads it from backing _current_task[] (and can't use the
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* caching reg for current task
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2013-01-18 09:42:23 +00:00
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*/
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.macro GET_CURR_TASK_ON_CPU reg
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GET_CPU_ID \reg
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ld.as \reg, [@_current_task, \reg]
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.endm
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/*-------------------------------------------------
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* Save a new task as the "current" task on this CPU
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* 1. Determine curr CPU id.
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* 2. Use it to index into _current_task[ ]
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*
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* Coded differently than GET_CURR_TASK_ON_CPU (which uses LD.AS)
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* because ST r0, [r1, offset] can ONLY have s9 @offset
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* while LD can take s9 (4 byte insn) or LIMM (8 byte insn)
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*/
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.macro SET_CURR_TASK_ON_CPU tsk, tmp
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GET_CPU_ID \tmp
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add2 \tmp, @_current_task, \tmp
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st \tsk, [\tmp]
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#ifdef CONFIG_ARC_CURR_IN_REG
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2020-05-13 05:18:08 +00:00
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mov gp, \tsk
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2013-01-18 09:42:23 +00:00
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#endif
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.endm
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#else /* Uniprocessor implementation of macros */
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2013-01-18 09:42:18 +00:00
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.macro GET_CURR_TASK_ON_CPU reg
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ld \reg, [@_current_task]
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.endm
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.macro SET_CURR_TASK_ON_CPU tsk, tmp
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st \tsk, [@_current_task]
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2013-02-11 14:22:57 +00:00
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#ifdef CONFIG_ARC_CURR_IN_REG
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2020-05-13 05:18:08 +00:00
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mov gp, \tsk
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2013-02-11 14:22:57 +00:00
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#endif
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2013-01-18 09:42:18 +00:00
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.endm
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2013-01-18 09:42:23 +00:00
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#endif /* SMP / UNI */
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2020-05-13 05:18:08 +00:00
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/*
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2013-01-18 09:42:18 +00:00
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* Get the ptr to some field of Current Task at @off in task struct
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2020-05-13 05:18:08 +00:00
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* - Uses current task cached in reg if enabled
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2013-01-18 09:42:18 +00:00
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*/
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2013-02-11 14:22:57 +00:00
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#ifdef CONFIG_ARC_CURR_IN_REG
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.macro GET_CURR_TASK_FIELD_PTR off, reg
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2020-05-13 05:18:08 +00:00
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add \reg, gp, \off
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2013-02-11 14:22:57 +00:00
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.endm
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#else
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2013-01-18 09:42:18 +00:00
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.macro GET_CURR_TASK_FIELD_PTR off, reg
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GET_CURR_TASK_ON_CPU \reg
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add \reg, \reg, \off
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.endm
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2013-02-11 14:22:57 +00:00
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#endif /* CONFIG_ARC_CURR_IN_REG */
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2023-08-13 01:23:59 +00:00
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#else /* !__ASSEMBLY__ */
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extern void do_signal(struct pt_regs *);
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extern void do_notify_resume(struct pt_regs *);
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extern int do_privilege_fault(unsigned long, struct pt_regs *);
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extern int do_extension_fault(unsigned long, struct pt_regs *);
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extern int insterror_is_error(unsigned long, struct pt_regs *);
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extern int do_memory_error(unsigned long, struct pt_regs *);
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extern int trap_is_brkpt(unsigned long, struct pt_regs *);
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extern int do_misaligned_error(unsigned long, struct pt_regs *);
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extern int do_trap5_error(unsigned long, struct pt_regs *);
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extern int do_misaligned_access(unsigned long, struct pt_regs *, struct callee_regs *);
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extern void do_machine_check_fault(unsigned long, struct pt_regs *);
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extern void do_non_swi_trap(unsigned long, struct pt_regs *);
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extern void do_insterror_or_kprobe(unsigned long, struct pt_regs *);
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extern void do_page_fault(unsigned long, struct pt_regs *);
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#endif
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2013-01-18 09:42:18 +00:00
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#endif /* __ASM_ARC_ENTRY_H */
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