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gerrit.openfyde.cn / github.com / raspberrypi / raspberrypi-kernel / 20c8ccb1975b8d5639789d1025ad6ada38bd6f48 / . / arch / arc / include / asm / entry.h
blob: 302b0db8ea2bd9afc0d55116e24eb1dcee92eea4 [file] [log] [blame]
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]1/*
Vineet Gupta6d1a20b2015-02-21 15:09:32 +0530[diff] [blame]2 * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]8 */
9
10#ifndef __ASM_ARC_ENTRY_H
11#define __ASM_ARC_ENTRY_H
12
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]13#include <asm/unistd.h> /* For NR_syscalls defination */
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]14#include <asm/arcregs.h>
15#include <asm/ptrace.h>
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]16#include <asm/processor.h> /* For VMALLOC_START */
Vineet Gupta4ffd9e22013-07-26 15:29:40 -0700[diff] [blame]17#include <asm/mmu.h>
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]18
Vineet Gupta1f6ccff2013-05-13 18:30:41 +0530[diff] [blame]19#ifdef CONFIG_ISA_ARCOMPACT
Vineet Gupta6d1a20b2015-02-21 15:09:32 +0530[diff] [blame]20#include <asm/entry-compact.h> /* ISA specific bits */
Vineet Gupta1f6ccff2013-05-13 18:30:41 +0530[diff] [blame]21#else
22#include <asm/entry-arcv2.h>
23#endif
Vineet Gupta6d1a20b2015-02-21 15:09:32 +0530[diff] [blame]24
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]25/* Note on the LD/ST addr modes with addr reg wback
26 *
27 * LD.a same as LD.aw
28 *
29 * LD.a reg1, [reg2, x] => Pre Incr
30 * Eff Addr for load = [reg2 + x]
31 *
32 * LD.ab reg1, [reg2, x] => Post Incr
33 * Eff Addr for load = [reg2]
34 */
35
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]36.macro PUSH reg
37 st.a \reg, [sp, -4]
38.endm
39
40.macro PUSHAX aux
41 lr r9, [\aux]
42 PUSH r9
43.endm
44
45.macro POP reg
46 ld.ab \reg, [sp, 4]
47.endm
48
49.macro POPAX aux
50 POP r9
51 sr r9, [\aux]
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]52.endm
53
54/*--------------------------------------------------------------
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]55 * Helpers to save/restore Scratch Regs:
56 * used by Interrupt/Exception Prologue/Epilogue
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]57 *-------------------------------------------------------------*/
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]58.macro SAVE_R0_TO_R12
59 PUSH r0
60 PUSH r1
61 PUSH r2
62 PUSH r3
63 PUSH r4
64 PUSH r5
65 PUSH r6
66 PUSH r7
67 PUSH r8
68 PUSH r9
69 PUSH r10
70 PUSH r11
71 PUSH r12
72.endm
73
74.macro RESTORE_R12_TO_R0
75 POP r12
76 POP r11
77 POP r10
78 POP r9
79 POP r8
80 POP r7
81 POP r6
82 POP r5
83 POP r4
84 POP r3
85 POP r2
86 POP r1
87 POP r0
Vineet Gupta359105b2013-05-28 13:50:41 +0530[diff] [blame]88
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]89.endm
90
91/*--------------------------------------------------------------
92 * Helpers to save/restore callee-saved regs:
93 * used by several macros below
94 *-------------------------------------------------------------*/
95.macro SAVE_R13_TO_R24
96 PUSH r13
97 PUSH r14
98 PUSH r15
99 PUSH r16
100 PUSH r17
101 PUSH r18
102 PUSH r19
103 PUSH r20
104 PUSH r21
105 PUSH r22
106 PUSH r23
107 PUSH r24
108.endm
109
110.macro RESTORE_R24_TO_R13
111 POP r24
112 POP r23
113 POP r22
114 POP r21
115 POP r20
116 POP r19
117 POP r18
118 POP r17
119 POP r16
120 POP r15
121 POP r14
122 POP r13
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]123.endm
124
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]125/*--------------------------------------------------------------
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]126 * Collect User Mode callee regs as struct callee_regs - needed by
127 * fork/do_signal/unaligned-access-emulation.
128 * (By default only scratch regs are saved on entry to kernel)
129 *
130 * Special handling for r25 if used for caching Task Pointer.
131 * It would have been saved in task->thread.user_r25 already, but to keep
132 * the interface same it is copied into regular r25 placeholder in
133 * struct callee_regs.
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]134 *-------------------------------------------------------------*/
135.macro SAVE_CALLEE_SAVED_USER
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]136
Vineet Gupta0d7b8852014-10-07 14:12:13 +0530[diff] [blame]137 mov r12, sp ; save SP as ref to pt_regs
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]138 SAVE_R13_TO_R24
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]139
140#ifdef CONFIG_ARC_CURR_IN_REG
Vineet Gupta0d7b8852014-10-07 14:12:13 +0530[diff] [blame]141 ; Retrieve orig r25 and save it with rest of callee_regs
Liav Rehana86147e32016-08-16 10:55:35 +0300[diff] [blame]142 ld r12, [r12, PT_user_r25]
Vineet Gupta0d7b8852014-10-07 14:12:13 +0530[diff] [blame]143 PUSH r12
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]144#else
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]145 PUSH r25
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]146#endif
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]147
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]148.endm
149
150/*--------------------------------------------------------------
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]151 * Save kernel Mode callee regs at the time of Contect Switch.
152 *
153 * Special handling for r25 if used for caching Task Pointer.
154 * Kernel simply skips saving it since it will be loaded with
155 * incoming task pointer anyways
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]156 *-------------------------------------------------------------*/
157.macro SAVE_CALLEE_SAVED_KERNEL
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]158
159 SAVE_R13_TO_R24
160
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]161#ifdef CONFIG_ARC_CURR_IN_REG
Vineet Gupta16f9afe2013-05-27 21:43:41 +0530[diff] [blame]162 sub sp, sp, 4
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]163#else
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]164 PUSH r25
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]165#endif
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]166.endm
167
168/*--------------------------------------------------------------
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]169 * Opposite of SAVE_CALLEE_SAVED_KERNEL
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]170 *-------------------------------------------------------------*/
171.macro RESTORE_CALLEE_SAVED_KERNEL
172
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]173#ifdef CONFIG_ARC_CURR_IN_REG
Vineet Gupta16f9afe2013-05-27 21:43:41 +0530[diff] [blame]174 add sp, sp, 4 /* skip usual r25 placeholder */
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]175#else
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]176 POP r25
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]177#endif
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]178 RESTORE_R24_TO_R13
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]179.endm
180
181/*--------------------------------------------------------------
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]182 * Opposite of SAVE_CALLEE_SAVED_USER
183 *
184 * ptrace tracer or unaligned-access fixup might have changed a user mode
185 * callee reg which is saved back to usual r25 storage location
Vineet Guptac3581032013-01-18 15:12:19 +0530[diff] [blame]186 *-------------------------------------------------------------*/
187.macro RESTORE_CALLEE_SAVED_USER
188
Vineet Guptac3581032013-01-18 15:12:19 +0530[diff] [blame]189#ifdef CONFIG_ARC_CURR_IN_REG
Vineet Gupta0d7b8852014-10-07 14:12:13 +0530[diff] [blame]190 POP r12
Vineet Guptac3581032013-01-18 15:12:19 +0530[diff] [blame]191#else
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]192 POP r25
Vineet Guptac3581032013-01-18 15:12:19 +0530[diff] [blame]193#endif
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]194 RESTORE_R24_TO_R13
Vineet Gupta0d7b8852014-10-07 14:12:13 +0530[diff] [blame]195
196 ; SP is back to start of pt_regs
197#ifdef CONFIG_ARC_CURR_IN_REG
Liav Rehana86147e32016-08-16 10:55:35 +0300[diff] [blame]198 st r12, [sp, PT_user_r25]
Vineet Gupta0d7b8852014-10-07 14:12:13 +0530[diff] [blame]199#endif
Vineet Guptac3581032013-01-18 15:12:19 +0530[diff] [blame]200.endm
201
202/*--------------------------------------------------------------
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]203 * Super FAST Restore callee saved regs by simply re-adjusting SP
204 *-------------------------------------------------------------*/
205.macro DISCARD_CALLEE_SAVED_USER
Vineet Gupta16f9afe2013-05-27 21:43:41 +0530[diff] [blame]206 add sp, sp, SZ_CALLEE_REGS
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]207.endm
208
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]209/*-------------------------------------------------------------
210 * given a tsk struct, get to the base of it's kernel mode stack
211 * tsk->thread_info is really a PAGE, whose bottom hoists stack
212 * which grows upwards towards thread_info
213 *------------------------------------------------------------*/
214
215.macro GET_TSK_STACK_BASE tsk, out
216
217 /* Get task->thread_info (this is essentially start of a PAGE) */
218 ld \out, [\tsk, TASK_THREAD_INFO]
219
220 /* Go to end of page where stack begins (grows upwards) */
Vineet Gupta283237a2013-05-28 09:34:45 +0530[diff] [blame]221 add2 \out, \out, (THREAD_SIZE)/4
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]222
223.endm
224
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]225/*
226 * @reg [OUT] thread_info->flags of "current"
227 */
228.macro GET_CURR_THR_INFO_FLAGS reg
229 GET_CURR_THR_INFO_FROM_SP \reg
230 ld \reg, [\reg, THREAD_INFO_FLAGS]
231.endm
232
Vineet Gupta41195d22013-01-18 15:12:23 +0530[diff] [blame]233#ifdef CONFIG_SMP
234
235/*-------------------------------------------------
236 * Retrieve the current running task on this CPU
237 * 1. Determine curr CPU id.
238 * 2. Use it to index into _current_task[ ]
239 */
240.macro GET_CURR_TASK_ON_CPU reg
241 GET_CPU_ID \reg
242 ld.as \reg, [@_current_task, \reg]
243.endm
244
245/*-------------------------------------------------
246 * Save a new task as the "current" task on this CPU
247 * 1. Determine curr CPU id.
248 * 2. Use it to index into _current_task[ ]
249 *
250 * Coded differently than GET_CURR_TASK_ON_CPU (which uses LD.AS)
251 * because ST r0, [r1, offset] can ONLY have s9 @offset
252 * while LD can take s9 (4 byte insn) or LIMM (8 byte insn)
253 */
254
255.macro SET_CURR_TASK_ON_CPU tsk, tmp
256 GET_CPU_ID \tmp
257 add2 \tmp, @_current_task, \tmp
258 st \tsk, [\tmp]
259#ifdef CONFIG_ARC_CURR_IN_REG
260 mov r25, \tsk
261#endif
262
263.endm
264
265
266#else /* Uniprocessor implementation of macros */
267
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]268.macro GET_CURR_TASK_ON_CPU reg
269 ld \reg, [@_current_task]
270.endm
271
272.macro SET_CURR_TASK_ON_CPU tsk, tmp
273 st \tsk, [@_current_task]
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]274#ifdef CONFIG_ARC_CURR_IN_REG
275 mov r25, \tsk
276#endif
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]277.endm
278
Vineet Gupta41195d22013-01-18 15:12:23 +0530[diff] [blame]279#endif /* SMP / UNI */
280
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]281/* ------------------------------------------------------------------
282 * Get the ptr to some field of Current Task at @off in task struct
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]283 * -Uses r25 for Current task ptr if that is enabled
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]284 */
285
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]286#ifdef CONFIG_ARC_CURR_IN_REG
287
288.macro GET_CURR_TASK_FIELD_PTR off, reg
289 add \reg, r25, \off
290.endm
291
292#else
293
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]294.macro GET_CURR_TASK_FIELD_PTR off, reg
295 GET_CURR_TASK_ON_CPU \reg
296 add \reg, \reg, \off
297.endm
298
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]299#endif /* CONFIG_ARC_CURR_IN_REG */
300
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]301#endif /* __ASM_ARC_ENTRY_H */