Linux kernel mirror (for testing)
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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 __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/* Note on the LD/ST addr modes with addr reg wback
25 *
26 * LD.a same as LD.aw
27 *
28 * LD.a reg1, [reg2, x] => Pre Incr
29 * Eff Addr for load = [reg2 + x]
30 *
31 * LD.ab reg1, [reg2, x] => Post Incr
32 * Eff Addr for load = [reg2]
33 */
34
35.macro PUSH reg
36 st.a \reg, [sp, -4]
37.endm
38
39.macro PUSHAX aux
40 lr r9, [\aux]
41 PUSH r9
42.endm
43
44.macro POP reg
45 ld.ab \reg, [sp, 4]
46.endm
47
48.macro POPAX aux
49 POP r9
50 sr r9, [\aux]
51.endm
52
53/*--------------------------------------------------------------
54 * Helpers to save/restore Scratch Regs:
55 * used by Interrupt/Exception Prologue/Epilogue
56 *-------------------------------------------------------------*/
57.macro SAVE_R0_TO_R12
58 PUSH r0
59 PUSH r1
60 PUSH r2
61 PUSH r3
62 PUSH r4
63 PUSH r5
64 PUSH r6
65 PUSH r7
66 PUSH r8
67 PUSH r9
68 PUSH r10
69 PUSH r11
70 PUSH r12
71.endm
72
73.macro RESTORE_R12_TO_R0
74 POP r12
75 POP r11
76 POP r10
77 POP r9
78 POP r8
79 POP r7
80 POP r6
81 POP r5
82 POP r4
83 POP r3
84 POP r2
85 POP r1
86 POP r0
87
88.endm
89
90/*--------------------------------------------------------------
91 * Helpers to save/restore callee-saved regs:
92 * used by several macros below
93 *-------------------------------------------------------------*/
94.macro SAVE_R13_TO_R25
95 PUSH r13
96 PUSH r14
97 PUSH r15
98 PUSH r16
99 PUSH r17
100 PUSH r18
101 PUSH r19
102 PUSH r20
103 PUSH r21
104 PUSH r22
105 PUSH r23
106 PUSH r24
107 PUSH r25
108.endm
109
110.macro RESTORE_R25_TO_R13
111 POP r25
112 POP r24
113 POP r23
114 POP r22
115 POP r21
116 POP r20
117 POP r19
118 POP r18
119 POP r17
120 POP r16
121 POP r15
122 POP r14
123 POP r13
124.endm
125
126/*
127 * save user mode callee regs as struct callee_regs
128 * - needed by fork/do_signal/unaligned-access-emulation.
129 */
130.macro SAVE_CALLEE_SAVED_USER
131 SAVE_R13_TO_R25
132.endm
133
134/*
135 * restore user mode callee regs as struct callee_regs
136 * - could have been changed by ptrace tracer or unaligned-access fixup
137 */
138.macro RESTORE_CALLEE_SAVED_USER
139 RESTORE_R25_TO_R13
140.endm
141
142/*
143 * save/restore kernel mode callee regs at the time of context switch
144 */
145.macro SAVE_CALLEE_SAVED_KERNEL
146 SAVE_R13_TO_R25
147.endm
148
149.macro RESTORE_CALLEE_SAVED_KERNEL
150 RESTORE_R25_TO_R13
151.endm
152
153/*--------------------------------------------------------------
154 * Super FAST Restore callee saved regs by simply re-adjusting SP
155 *-------------------------------------------------------------*/
156.macro DISCARD_CALLEE_SAVED_USER
157 add sp, sp, SZ_CALLEE_REGS
158.endm
159
160/*-------------------------------------------------------------
161 * given a tsk struct, get to the base of it's kernel mode stack
162 * tsk->thread_info is really a PAGE, whose bottom hoists stack
163 * which grows upwards towards thread_info
164 *------------------------------------------------------------*/
165
166.macro GET_TSK_STACK_BASE tsk, out
167
168 /* Get task->thread_info (this is essentially start of a PAGE) */
169 ld \out, [\tsk, TASK_THREAD_INFO]
170
171 /* Go to end of page where stack begins (grows upwards) */
172 add2 \out, \out, (THREAD_SIZE)/4
173
174.endm
175
176/*
177 * @reg [OUT] thread_info->flags of "current"
178 */
179.macro GET_CURR_THR_INFO_FLAGS reg
180 GET_CURR_THR_INFO_FROM_SP \reg
181 ld \reg, [\reg, THREAD_INFO_FLAGS]
182.endm
183
184#ifdef CONFIG_SMP
185
186/*
187 * Retrieve the current running task on this CPU
188 * - loads it from backing _current_task[] (and can't use the
189 * caching reg for current task
190 */
191.macro GET_CURR_TASK_ON_CPU reg
192 GET_CPU_ID \reg
193 ld.as \reg, [@_current_task, \reg]
194.endm
195
196/*-------------------------------------------------
197 * Save a new task as the "current" task on this CPU
198 * 1. Determine curr CPU id.
199 * 2. Use it to index into _current_task[ ]
200 *
201 * Coded differently than GET_CURR_TASK_ON_CPU (which uses LD.AS)
202 * because ST r0, [r1, offset] can ONLY have s9 @offset
203 * while LD can take s9 (4 byte insn) or LIMM (8 byte insn)
204 */
205
206.macro SET_CURR_TASK_ON_CPU tsk, tmp
207 GET_CPU_ID \tmp
208 add2 \tmp, @_current_task, \tmp
209 st \tsk, [\tmp]
210#ifdef CONFIG_ARC_CURR_IN_REG
211 mov gp, \tsk
212#endif
213
214.endm
215
216
217#else /* Uniprocessor implementation of macros */
218
219.macro GET_CURR_TASK_ON_CPU reg
220 ld \reg, [@_current_task]
221.endm
222
223.macro SET_CURR_TASK_ON_CPU tsk, tmp
224 st \tsk, [@_current_task]
225#ifdef CONFIG_ARC_CURR_IN_REG
226 mov gp, \tsk
227#endif
228.endm
229
230#endif /* SMP / UNI */
231
232/*
233 * Get the ptr to some field of Current Task at @off in task struct
234 * - Uses current task cached in reg if enabled
235 */
236#ifdef CONFIG_ARC_CURR_IN_REG
237
238.macro GET_CURR_TASK_FIELD_PTR off, reg
239 add \reg, gp, \off
240.endm
241
242#else
243
244.macro GET_CURR_TASK_FIELD_PTR off, reg
245 GET_CURR_TASK_ON_CPU \reg
246 add \reg, \reg, \off
247.endm
248
249#endif /* CONFIG_ARC_CURR_IN_REG */
250
251#else /* !__ASSEMBLY__ */
252
253extern void do_signal(struct pt_regs *);
254extern void do_notify_resume(struct pt_regs *);
255extern int do_privilege_fault(unsigned long, struct pt_regs *);
256extern int do_extension_fault(unsigned long, struct pt_regs *);
257extern int insterror_is_error(unsigned long, struct pt_regs *);
258extern int do_memory_error(unsigned long, struct pt_regs *);
259extern int trap_is_brkpt(unsigned long, struct pt_regs *);
260extern int do_misaligned_error(unsigned long, struct pt_regs *);
261extern int do_trap5_error(unsigned long, struct pt_regs *);
262extern int do_misaligned_access(unsigned long, struct pt_regs *, struct callee_regs *);
263extern void do_machine_check_fault(unsigned long, struct pt_regs *);
264extern void do_non_swi_trap(unsigned long, struct pt_regs *);
265extern void do_insterror_or_kprobe(unsigned long, struct pt_regs *);
266extern void do_page_fault(unsigned long, struct pt_regs *);
267
268#endif
269
270#endif /* __ASM_ARC_ENTRY_H */