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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 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 __ASSEMBLER__
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 /* !__ASSEMBLER__ */
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 */