Loading...
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
4 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
5 */
6
7#ifndef __ASM_ARC_ENTRY_H
8#define __ASM_ARC_ENTRY_H
9
10#include <asm/unistd.h> /* For NR_syscalls defination */
11#include <asm/arcregs.h>
12#include <asm/ptrace.h>
13#include <asm/processor.h> /* For VMALLOC_START */
14#include <asm/mmu.h>
15
16#ifdef CONFIG_ISA_ARCOMPACT
17#include <asm/entry-compact.h> /* ISA specific bits */
18#else
19#include <asm/entry-arcv2.h>
20#endif
21
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
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]
49.endm
50
51/*--------------------------------------------------------------
52 * Helpers to save/restore Scratch Regs:
53 * used by Interrupt/Exception Prologue/Epilogue
54 *-------------------------------------------------------------*/
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
85
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
120.endm
121
122/*--------------------------------------------------------------
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.
131 *-------------------------------------------------------------*/
132.macro SAVE_CALLEE_SAVED_USER
133
134 mov r12, sp ; save SP as ref to pt_regs
135 SAVE_R13_TO_R24
136
137#ifdef CONFIG_ARC_CURR_IN_REG
138 ; Retrieve orig r25 and save it with rest of callee_regs
139 ld r12, [r12, PT_user_r25]
140 PUSH r12
141#else
142 PUSH r25
143#endif
144
145.endm
146
147/*--------------------------------------------------------------
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
153 *-------------------------------------------------------------*/
154.macro SAVE_CALLEE_SAVED_KERNEL
155
156 SAVE_R13_TO_R24
157
158#ifdef CONFIG_ARC_CURR_IN_REG
159 sub sp, sp, 4
160#else
161 PUSH r25
162#endif
163.endm
164
165/*--------------------------------------------------------------
166 * Opposite of SAVE_CALLEE_SAVED_KERNEL
167 *-------------------------------------------------------------*/
168.macro RESTORE_CALLEE_SAVED_KERNEL
169
170#ifdef CONFIG_ARC_CURR_IN_REG
171 add sp, sp, 4 /* skip usual r25 placeholder */
172#else
173 POP r25
174#endif
175 RESTORE_R24_TO_R13
176.endm
177
178/*--------------------------------------------------------------
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
183 *-------------------------------------------------------------*/
184.macro RESTORE_CALLEE_SAVED_USER
185
186#ifdef CONFIG_ARC_CURR_IN_REG
187 POP r12
188#else
189 POP r25
190#endif
191 RESTORE_R24_TO_R13
192
193 ; SP is back to start of pt_regs
194#ifdef CONFIG_ARC_CURR_IN_REG
195 st r12, [sp, PT_user_r25]
196#endif
197.endm
198
199/*--------------------------------------------------------------
200 * Super FAST Restore callee saved regs by simply re-adjusting SP
201 *-------------------------------------------------------------*/
202.macro DISCARD_CALLEE_SAVED_USER
203 add sp, sp, SZ_CALLEE_REGS
204.endm
205
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) */
218 add2 \out, \out, (THREAD_SIZE)/4
219
220.endm
221
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
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
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]
271#ifdef CONFIG_ARC_CURR_IN_REG
272 mov r25, \tsk
273#endif
274.endm
275
276#endif /* SMP / UNI */
277
278/* ------------------------------------------------------------------
279 * Get the ptr to some field of Current Task at @off in task struct
280 * -Uses r25 for Current task ptr if that is enabled
281 */
282
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
291.macro GET_CURR_TASK_FIELD_PTR off, reg
292 GET_CURR_TASK_ON_CPU \reg
293 add \reg, \reg, \off
294.endm
295
296#endif /* CONFIG_ARC_CURR_IN_REG */
297
298#endif /* __ASM_ARC_ENTRY_H */
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
4 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
5 */
6
7#ifndef __ASM_ARC_ENTRY_H
8#define __ASM_ARC_ENTRY_H
9
10#include <asm/unistd.h> /* For NR_syscalls definition */
11#include <asm/arcregs.h>
12#include <asm/ptrace.h>
13#include <asm/processor.h> /* For VMALLOC_START */
14#include <asm/mmu.h>
15
16#ifdef __ASSEMBLY__
17
18#ifdef CONFIG_ISA_ARCOMPACT
19#include <asm/entry-compact.h> /* ISA specific bits */
20#else
21#include <asm/entry-arcv2.h>
22#endif
23
24/*
25 * save user mode callee regs as struct callee_regs
26 * - needed by fork/do_signal/unaligned-access-emulation.
27 */
28.macro SAVE_CALLEE_SAVED_USER
29 SAVE_ABI_CALLEE_REGS
30.endm
31
32/*
33 * restore user mode callee regs as struct callee_regs
34 * - could have been changed by ptrace tracer or unaligned-access fixup
35 */
36.macro RESTORE_CALLEE_SAVED_USER
37 RESTORE_ABI_CALLEE_REGS
38.endm
39
40/*
41 * save/restore kernel mode callee regs at the time of context switch
42 */
43.macro SAVE_CALLEE_SAVED_KERNEL
44 SAVE_ABI_CALLEE_REGS
45.endm
46
47.macro RESTORE_CALLEE_SAVED_KERNEL
48 RESTORE_ABI_CALLEE_REGS
49.endm
50
51/*--------------------------------------------------------------
52 * Super FAST Restore callee saved regs by simply re-adjusting SP
53 *-------------------------------------------------------------*/
54.macro DISCARD_CALLEE_SAVED_USER
55 add sp, sp, SZ_CALLEE_REGS
56.endm
57
58/*-------------------------------------------------------------
59 * given a tsk struct, get to the base of its kernel mode stack
60 * tsk->thread_info is really a PAGE, whose bottom hoists stack
61 * which grows upwards towards thread_info
62 *------------------------------------------------------------*/
63
64.macro GET_TSK_STACK_BASE tsk, out
65
66 /* Get task->thread_info (this is essentially start of a PAGE) */
67 ld \out, [\tsk, TASK_THREAD_INFO]
68
69 /* Go to end of page where stack begins (grows upwards) */
70 add2 \out, \out, (THREAD_SIZE)/4
71
72.endm
73
74/*
75 * @reg [OUT] thread_info->flags of "current"
76 */
77.macro GET_CURR_THR_INFO_FLAGS reg
78 GET_CURR_THR_INFO_FROM_SP \reg
79 ld \reg, [\reg, THREAD_INFO_FLAGS]
80.endm
81
82#ifdef CONFIG_SMP
83
84/*
85 * Retrieve the current running task on this CPU
86 * - loads it from backing _current_task[] (and can't use the
87 * caching reg for current task
88 */
89.macro GET_CURR_TASK_ON_CPU reg
90 GET_CPU_ID \reg
91 ld.as \reg, [@_current_task, \reg]
92.endm
93
94/*-------------------------------------------------
95 * Save a new task as the "current" task on this CPU
96 * 1. Determine curr CPU id.
97 * 2. Use it to index into _current_task[ ]
98 *
99 * Coded differently than GET_CURR_TASK_ON_CPU (which uses LD.AS)
100 * because ST r0, [r1, offset] can ONLY have s9 @offset
101 * while LD can take s9 (4 byte insn) or LIMM (8 byte insn)
102 */
103
104.macro SET_CURR_TASK_ON_CPU tsk, tmp
105 GET_CPU_ID \tmp
106 add2 \tmp, @_current_task, \tmp
107 st \tsk, [\tmp]
108#ifdef CONFIG_ARC_CURR_IN_REG
109 mov gp, \tsk
110#endif
111
112.endm
113
114
115#else /* Uniprocessor implementation of macros */
116
117.macro GET_CURR_TASK_ON_CPU reg
118 ld \reg, [@_current_task]
119.endm
120
121.macro SET_CURR_TASK_ON_CPU tsk, tmp
122 st \tsk, [@_current_task]
123#ifdef CONFIG_ARC_CURR_IN_REG
124 mov gp, \tsk
125#endif
126.endm
127
128#endif /* SMP / UNI */
129
130/*
131 * Get the ptr to some field of Current Task at @off in task struct
132 * - Uses current task cached in reg if enabled
133 */
134#ifdef CONFIG_ARC_CURR_IN_REG
135
136.macro GET_CURR_TASK_FIELD_PTR off, reg
137 add \reg, gp, \off
138.endm
139
140#else
141
142.macro GET_CURR_TASK_FIELD_PTR off, reg
143 GET_CURR_TASK_ON_CPU \reg
144 add \reg, \reg, \off
145.endm
146
147#endif /* CONFIG_ARC_CURR_IN_REG */
148
149#else /* !__ASSEMBLY__ */
150
151extern void do_signal(struct pt_regs *);
152extern void do_notify_resume(struct pt_regs *);
153extern int do_privilege_fault(unsigned long, struct pt_regs *);
154extern int do_extension_fault(unsigned long, struct pt_regs *);
155extern int insterror_is_error(unsigned long, struct pt_regs *);
156extern int do_memory_error(unsigned long, struct pt_regs *);
157extern int trap_is_brkpt(unsigned long, struct pt_regs *);
158extern int do_misaligned_error(unsigned long, struct pt_regs *);
159extern int do_trap5_error(unsigned long, struct pt_regs *);
160extern int do_misaligned_access(unsigned long, struct pt_regs *, struct callee_regs *);
161extern void do_machine_check_fault(unsigned long, struct pt_regs *);
162extern void do_non_swi_trap(unsigned long, struct pt_regs *);
163extern void do_insterror_or_kprobe(unsigned long, struct pt_regs *);
164extern void do_page_fault(unsigned long, struct pt_regs *);
165
166#endif
167
168#endif /* __ASM_ARC_ENTRY_H */