Gitiles
Code Review Sign In
gerrit.openfyde.cn / github.com / raspberrypi / raspberrypi-kernel / d2912cb15bdda8ba4a5dd73396ad62641af2f520 / . / arch / arc / include / asm / entry.h
blob: fcdd59d77f42cd61b5236144f6b1bfefad29367d [file] [log] [blame]
Thomas Gleixnerd2912cb2019-06-04 10:11:33 +0200[diff] [blame^]1/* SPDX-License-Identifier: GPL-2.0-only */
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]2/*
Vineet Gupta6d1a20b2015-02-21 15:09:32 +0530[diff] [blame]3 * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]4 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]5 */
6
7#ifndef __ASM_ARC_ENTRY_H
8#define __ASM_ARC_ENTRY_H
9
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]10#include <asm/unistd.h> /* For NR_syscalls defination */
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]11#include <asm/arcregs.h>
12#include <asm/ptrace.h>
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]13#include <asm/processor.h> /* For VMALLOC_START */
Vineet Gupta4ffd9e22013-07-26 15:29:40 -0700[diff] [blame]14#include <asm/mmu.h>
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]15
Vineet Gupta1f6ccff2013-05-13 18:30:41 +0530[diff] [blame]16#ifdef CONFIG_ISA_ARCOMPACT
Vineet Gupta6d1a20b2015-02-21 15:09:32 +0530[diff] [blame]17#include <asm/entry-compact.h> /* ISA specific bits */
Vineet Gupta1f6ccff2013-05-13 18:30:41 +0530[diff] [blame]18#else
19#include <asm/entry-arcv2.h>
20#endif
Vineet Gupta6d1a20b2015-02-21 15:09:32 +0530[diff] [blame]21
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]22/* Note on the LD/ST addr modes with addr reg wback
23 *
24 * LD.a same as LD.aw
25 *
26 * LD.a reg1, [reg2, x] => Pre Incr
27 * Eff Addr for load = [reg2 + x]
28 *
29 * LD.ab reg1, [reg2, x] => Post Incr
30 * Eff Addr for load = [reg2]
31 */
32
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]33.macro PUSH reg
34 st.a \reg, [sp, -4]
35.endm
36
37.macro PUSHAX aux
38 lr r9, [\aux]
39 PUSH r9
40.endm
41
42.macro POP reg
43 ld.ab \reg, [sp, 4]
44.endm
45
46.macro POPAX aux
47 POP r9
48 sr r9, [\aux]
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]49.endm
50
51/*--------------------------------------------------------------
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]52 * Helpers to save/restore Scratch Regs:
53 * used by Interrupt/Exception Prologue/Epilogue
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]54 *-------------------------------------------------------------*/
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]55.macro SAVE_R0_TO_R12
56 PUSH r0
57 PUSH r1
58 PUSH r2
59 PUSH r3
60 PUSH r4
61 PUSH r5
62 PUSH r6
63 PUSH r7
64 PUSH r8
65 PUSH r9
66 PUSH r10
67 PUSH r11
68 PUSH r12
69.endm
70
71.macro RESTORE_R12_TO_R0
72 POP r12
73 POP r11
74 POP r10
75 POP r9
76 POP r8
77 POP r7
78 POP r6
79 POP r5
80 POP r4
81 POP r3
82 POP r2
83 POP r1
84 POP r0
Vineet Gupta359105b2013-05-28 13:50:41 +0530[diff] [blame]85
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]86.endm
87
88/*--------------------------------------------------------------
89 * Helpers to save/restore callee-saved regs:
90 * used by several macros below
91 *-------------------------------------------------------------*/
92.macro SAVE_R13_TO_R24
93 PUSH r13
94 PUSH r14
95 PUSH r15
96 PUSH r16
97 PUSH r17
98 PUSH r18
99 PUSH r19
100 PUSH r20
101 PUSH r21
102 PUSH r22
103 PUSH r23
104 PUSH r24
105.endm
106
107.macro RESTORE_R24_TO_R13
108 POP r24
109 POP r23
110 POP r22
111 POP r21
112 POP r20
113 POP r19
114 POP r18
115 POP r17
116 POP r16
117 POP r15
118 POP r14
119 POP r13
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]120.endm
121
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]122/*--------------------------------------------------------------
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]123 * Collect User Mode callee regs as struct callee_regs - needed by
124 * fork/do_signal/unaligned-access-emulation.
125 * (By default only scratch regs are saved on entry to kernel)
126 *
127 * Special handling for r25 if used for caching Task Pointer.
128 * It would have been saved in task->thread.user_r25 already, but to keep
129 * the interface same it is copied into regular r25 placeholder in
130 * struct callee_regs.
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]131 *-------------------------------------------------------------*/
132.macro SAVE_CALLEE_SAVED_USER
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]133
Vineet Gupta0d7b8852014-10-07 14:12:13 +0530[diff] [blame]134 mov r12, sp ; save SP as ref to pt_regs
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]135 SAVE_R13_TO_R24
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]136
137#ifdef CONFIG_ARC_CURR_IN_REG
Vineet Gupta0d7b8852014-10-07 14:12:13 +0530[diff] [blame]138 ; Retrieve orig r25 and save it with rest of callee_regs
Liav Rehana86147e32016-08-16 10:55:35 +0300[diff] [blame]139 ld r12, [r12, PT_user_r25]
Vineet Gupta0d7b8852014-10-07 14:12:13 +0530[diff] [blame]140 PUSH r12
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]141#else
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]142 PUSH r25
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]143#endif
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]144
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]145.endm
146
147/*--------------------------------------------------------------
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]148 * Save kernel Mode callee regs at the time of Contect Switch.
149 *
150 * Special handling for r25 if used for caching Task Pointer.
151 * Kernel simply skips saving it since it will be loaded with
152 * incoming task pointer anyways
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]153 *-------------------------------------------------------------*/
154.macro SAVE_CALLEE_SAVED_KERNEL
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]155
156 SAVE_R13_TO_R24
157
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]158#ifdef CONFIG_ARC_CURR_IN_REG
Vineet Gupta16f9afe2013-05-27 21:43:41 +0530[diff] [blame]159 sub sp, sp, 4
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]160#else
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]161 PUSH r25
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]162#endif
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]163.endm
164
165/*--------------------------------------------------------------
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]166 * Opposite of SAVE_CALLEE_SAVED_KERNEL
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]167 *-------------------------------------------------------------*/
168.macro RESTORE_CALLEE_SAVED_KERNEL
169
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]170#ifdef CONFIG_ARC_CURR_IN_REG
Vineet Gupta16f9afe2013-05-27 21:43:41 +0530[diff] [blame]171 add sp, sp, 4 /* skip usual r25 placeholder */
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]172#else
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]173 POP r25
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]174#endif
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]175 RESTORE_R24_TO_R13
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]176.endm
177
178/*--------------------------------------------------------------
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]179 * Opposite of SAVE_CALLEE_SAVED_USER
180 *
181 * ptrace tracer or unaligned-access fixup might have changed a user mode
182 * callee reg which is saved back to usual r25 storage location
Vineet Guptac3581032013-01-18 15:12:19 +0530[diff] [blame]183 *-------------------------------------------------------------*/
184.macro RESTORE_CALLEE_SAVED_USER
185
Vineet Guptac3581032013-01-18 15:12:19 +0530[diff] [blame]186#ifdef CONFIG_ARC_CURR_IN_REG
Vineet Gupta0d7b8852014-10-07 14:12:13 +0530[diff] [blame]187 POP r12
Vineet Guptac3581032013-01-18 15:12:19 +0530[diff] [blame]188#else
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]189 POP r25
Vineet Guptac3581032013-01-18 15:12:19 +0530[diff] [blame]190#endif
Vineet Gupta3ebedbb2013-05-28 13:24:43 +0530[diff] [blame]191 RESTORE_R24_TO_R13
Vineet Gupta0d7b8852014-10-07 14:12:13 +0530[diff] [blame]192
193 ; SP is back to start of pt_regs
194#ifdef CONFIG_ARC_CURR_IN_REG
Liav Rehana86147e32016-08-16 10:55:35 +0300[diff] [blame]195 st r12, [sp, PT_user_r25]
Vineet Gupta0d7b8852014-10-07 14:12:13 +0530[diff] [blame]196#endif
Vineet Guptac3581032013-01-18 15:12:19 +0530[diff] [blame]197.endm
198
199/*--------------------------------------------------------------
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]200 * Super FAST Restore callee saved regs by simply re-adjusting SP
201 *-------------------------------------------------------------*/
202.macro DISCARD_CALLEE_SAVED_USER
Vineet Gupta16f9afe2013-05-27 21:43:41 +0530[diff] [blame]203 add sp, sp, SZ_CALLEE_REGS
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]204.endm
205
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]206/*-------------------------------------------------------------
207 * given a tsk struct, get to the base of it's kernel mode stack
208 * tsk->thread_info is really a PAGE, whose bottom hoists stack
209 * which grows upwards towards thread_info
210 *------------------------------------------------------------*/
211
212.macro GET_TSK_STACK_BASE tsk, out
213
214 /* Get task->thread_info (this is essentially start of a PAGE) */
215 ld \out, [\tsk, TASK_THREAD_INFO]
216
217 /* Go to end of page where stack begins (grows upwards) */
Vineet Gupta283237a2013-05-28 09:34:45 +0530[diff] [blame]218 add2 \out, \out, (THREAD_SIZE)/4
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]219
220.endm
221
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]222/*
223 * @reg [OUT] thread_info->flags of "current"
224 */
225.macro GET_CURR_THR_INFO_FLAGS reg
226 GET_CURR_THR_INFO_FROM_SP \reg
227 ld \reg, [\reg, THREAD_INFO_FLAGS]
228.endm
229
Vineet Gupta41195d22013-01-18 15:12:23 +0530[diff] [blame]230#ifdef CONFIG_SMP
231
232/*-------------------------------------------------
233 * Retrieve the current running task on this CPU
234 * 1. Determine curr CPU id.
235 * 2. Use it to index into _current_task[ ]
236 */
237.macro GET_CURR_TASK_ON_CPU reg
238 GET_CPU_ID \reg
239 ld.as \reg, [@_current_task, \reg]
240.endm
241
242/*-------------------------------------------------
243 * Save a new task as the "current" task on this CPU
244 * 1. Determine curr CPU id.
245 * 2. Use it to index into _current_task[ ]
246 *
247 * Coded differently than GET_CURR_TASK_ON_CPU (which uses LD.AS)
248 * because ST r0, [r1, offset] can ONLY have s9 @offset
249 * while LD can take s9 (4 byte insn) or LIMM (8 byte insn)
250 */
251
252.macro SET_CURR_TASK_ON_CPU tsk, tmp
253 GET_CPU_ID \tmp
254 add2 \tmp, @_current_task, \tmp
255 st \tsk, [\tmp]
256#ifdef CONFIG_ARC_CURR_IN_REG
257 mov r25, \tsk
258#endif
259
260.endm
261
262
263#else /* Uniprocessor implementation of macros */
264
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]265.macro GET_CURR_TASK_ON_CPU reg
266 ld \reg, [@_current_task]
267.endm
268
269.macro SET_CURR_TASK_ON_CPU tsk, tmp
270 st \tsk, [@_current_task]
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]271#ifdef CONFIG_ARC_CURR_IN_REG
272 mov r25, \tsk
273#endif
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]274.endm
275
Vineet Gupta41195d22013-01-18 15:12:23 +0530[diff] [blame]276#endif /* SMP / UNI */
277
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]278/* ------------------------------------------------------------------
279 * Get the ptr to some field of Current Task at @off in task struct
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]280 * -Uses r25 for Current task ptr if that is enabled
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]281 */
282
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]283#ifdef CONFIG_ARC_CURR_IN_REG
284
285.macro GET_CURR_TASK_FIELD_PTR off, reg
286 add \reg, r25, \off
287.endm
288
289#else
290
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]291.macro GET_CURR_TASK_FIELD_PTR off, reg
292 GET_CURR_TASK_ON_CPU \reg
293 add \reg, \reg, \off
294.endm
295
Vineet Gupta080c3742013-02-11 19:52:57 +0530[diff] [blame]296#endif /* CONFIG_ARC_CURR_IN_REG */
297
Vineet Gupta9d42c842013-01-18 15:12:18 +0530[diff] [blame]298#endif /* __ASM_ARC_ENTRY_H */