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1/*
2 * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
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.
8 */
9
10#ifndef __ASM_ARC_ENTRY_H
11#define __ASM_ARC_ENTRY_H
12
13#include <asm/unistd.h> /* For NR_syscalls defination */
14#include <asm/arcregs.h>
15#include <asm/ptrace.h>
16#include <asm/processor.h> /* For VMALLOC_START */
17#include <asm/mmu.h>
18
19#ifdef CONFIG_ISA_ARCOMPACT
20#include <asm/entry-compact.h> /* ISA specific bits */
21#else
22#include <asm/entry-arcv2.h>
23#endif
24
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
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]
52.endm
53
54/*--------------------------------------------------------------
55 * Helpers to save/restore Scratch Regs:
56 * used by Interrupt/Exception Prologue/Epilogue
57 *-------------------------------------------------------------*/
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
88
89#ifdef CONFIG_ARC_CURR_IN_REG
90 ld r25, [sp, 12]
91#endif
92.endm
93
94/*--------------------------------------------------------------
95 * Helpers to save/restore callee-saved regs:
96 * used by several macros below
97 *-------------------------------------------------------------*/
98.macro SAVE_R13_TO_R24
99 PUSH r13
100 PUSH r14
101 PUSH r15
102 PUSH r16
103 PUSH r17
104 PUSH r18
105 PUSH r19
106 PUSH r20
107 PUSH r21
108 PUSH r22
109 PUSH r23
110 PUSH r24
111.endm
112
113.macro RESTORE_R24_TO_R13
114 POP r24
115 POP r23
116 POP r22
117 POP r21
118 POP r20
119 POP r19
120 POP r18
121 POP r17
122 POP r16
123 POP r15
124 POP r14
125 POP r13
126.endm
127
128/*--------------------------------------------------------------
129 * Collect User Mode callee regs as struct callee_regs - needed by
130 * fork/do_signal/unaligned-access-emulation.
131 * (By default only scratch regs are saved on entry to kernel)
132 *
133 * Special handling for r25 if used for caching Task Pointer.
134 * It would have been saved in task->thread.user_r25 already, but to keep
135 * the interface same it is copied into regular r25 placeholder in
136 * struct callee_regs.
137 *-------------------------------------------------------------*/
138.macro SAVE_CALLEE_SAVED_USER
139
140 mov r12, sp ; save SP as ref to pt_regs
141 SAVE_R13_TO_R24
142
143#ifdef CONFIG_ARC_CURR_IN_REG
144 ; Retrieve orig r25 and save it with rest of callee_regs
145 ld r12, [r12, PT_user_r25]
146 PUSH r12
147#else
148 PUSH r25
149#endif
150
151.endm
152
153/*--------------------------------------------------------------
154 * Save kernel Mode callee regs at the time of Contect Switch.
155 *
156 * Special handling for r25 if used for caching Task Pointer.
157 * Kernel simply skips saving it since it will be loaded with
158 * incoming task pointer anyways
159 *-------------------------------------------------------------*/
160.macro SAVE_CALLEE_SAVED_KERNEL
161
162 SAVE_R13_TO_R24
163
164#ifdef CONFIG_ARC_CURR_IN_REG
165 sub sp, sp, 4
166#else
167 PUSH r25
168#endif
169.endm
170
171/*--------------------------------------------------------------
172 * Opposite of SAVE_CALLEE_SAVED_KERNEL
173 *-------------------------------------------------------------*/
174.macro RESTORE_CALLEE_SAVED_KERNEL
175
176#ifdef CONFIG_ARC_CURR_IN_REG
177 add sp, sp, 4 /* skip usual r25 placeholder */
178#else
179 POP r25
180#endif
181 RESTORE_R24_TO_R13
182.endm
183
184/*--------------------------------------------------------------
185 * Opposite of SAVE_CALLEE_SAVED_USER
186 *
187 * ptrace tracer or unaligned-access fixup might have changed a user mode
188 * callee reg which is saved back to usual r25 storage location
189 *-------------------------------------------------------------*/
190.macro RESTORE_CALLEE_SAVED_USER
191
192#ifdef CONFIG_ARC_CURR_IN_REG
193 POP r12
194#else
195 POP r25
196#endif
197 RESTORE_R24_TO_R13
198
199 ; SP is back to start of pt_regs
200#ifdef CONFIG_ARC_CURR_IN_REG
201 st r12, [sp, PT_user_r25]
202#endif
203.endm
204
205/*--------------------------------------------------------------
206 * Super FAST Restore callee saved regs by simply re-adjusting SP
207 *-------------------------------------------------------------*/
208.macro DISCARD_CALLEE_SAVED_USER
209 add sp, sp, SZ_CALLEE_REGS
210.endm
211
212/*-------------------------------------------------------------
213 * given a tsk struct, get to the base of it's kernel mode stack
214 * tsk->thread_info is really a PAGE, whose bottom hoists stack
215 * which grows upwards towards thread_info
216 *------------------------------------------------------------*/
217
218.macro GET_TSK_STACK_BASE tsk, out
219
220 /* Get task->thread_info (this is essentially start of a PAGE) */
221 ld \out, [\tsk, TASK_THREAD_INFO]
222
223 /* Go to end of page where stack begins (grows upwards) */
224 add2 \out, \out, (THREAD_SIZE)/4
225
226.endm
227
228/*
229 * @reg [OUT] thread_info->flags of "current"
230 */
231.macro GET_CURR_THR_INFO_FLAGS reg
232 GET_CURR_THR_INFO_FROM_SP \reg
233 ld \reg, [\reg, THREAD_INFO_FLAGS]
234.endm
235
236#ifdef CONFIG_SMP
237
238/*-------------------------------------------------
239 * Retrieve the current running task on this CPU
240 * 1. Determine curr CPU id.
241 * 2. Use it to index into _current_task[ ]
242 */
243.macro GET_CURR_TASK_ON_CPU reg
244 GET_CPU_ID \reg
245 ld.as \reg, [@_current_task, \reg]
246.endm
247
248/*-------------------------------------------------
249 * Save a new task as the "current" task on this CPU
250 * 1. Determine curr CPU id.
251 * 2. Use it to index into _current_task[ ]
252 *
253 * Coded differently than GET_CURR_TASK_ON_CPU (which uses LD.AS)
254 * because ST r0, [r1, offset] can ONLY have s9 @offset
255 * while LD can take s9 (4 byte insn) or LIMM (8 byte insn)
256 */
257
258.macro SET_CURR_TASK_ON_CPU tsk, tmp
259 GET_CPU_ID \tmp
260 add2 \tmp, @_current_task, \tmp
261 st \tsk, [\tmp]
262#ifdef CONFIG_ARC_CURR_IN_REG
263 mov r25, \tsk
264#endif
265
266.endm
267
268
269#else /* Uniprocessor implementation of macros */
270
271.macro GET_CURR_TASK_ON_CPU reg
272 ld \reg, [@_current_task]
273.endm
274
275.macro SET_CURR_TASK_ON_CPU tsk, tmp
276 st \tsk, [@_current_task]
277#ifdef CONFIG_ARC_CURR_IN_REG
278 mov r25, \tsk
279#endif
280.endm
281
282#endif /* SMP / UNI */
283
284/* ------------------------------------------------------------------
285 * Get the ptr to some field of Current Task at @off in task struct
286 * -Uses r25 for Current task ptr if that is enabled
287 */
288
289#ifdef CONFIG_ARC_CURR_IN_REG
290
291.macro GET_CURR_TASK_FIELD_PTR off, reg
292 add \reg, r25, \off
293.endm
294
295#else
296
297.macro GET_CURR_TASK_FIELD_PTR off, reg
298 GET_CURR_TASK_ON_CPU \reg
299 add \reg, \reg, \off
300.endm
301
302#endif /* CONFIG_ARC_CURR_IN_REG */
303
304#endif /* __ASM_ARC_ENTRY_H */