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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
4 *
5 * Amit Bhor, Sameer Dhavale: Codito Technologies 2004
6 */
7#ifndef __ASM_ARC_PTRACE_H
8#define __ASM_ARC_PTRACE_H
9
10#include <uapi/asm/ptrace.h>
11#include <linux/compiler.h>
12
13#ifndef __ASSEMBLY__
14
15typedef union {
16 struct {
17#ifdef CONFIG_CPU_BIG_ENDIAN
18 unsigned long state:8, vec:8, cause:8, param:8;
19#else
20 unsigned long param:8, cause:8, vec:8, state:8;
21#endif
22 };
23 unsigned long full;
24} ecr_reg;
25
26/* THE pt_regs: Defines how regs are saved during entry into kernel */
27
28#ifdef CONFIG_ISA_ARCOMPACT
29struct pt_regs {
30
31 /* Real registers */
32 unsigned long bta; /* bta_l1, bta_l2, erbta */
33
34 unsigned long lp_start, lp_end, lp_count;
35
36 unsigned long status32; /* status32_l1, status32_l2, erstatus */
37 unsigned long ret; /* ilink1, ilink2 or eret */
38 unsigned long blink;
39 unsigned long fp;
40 unsigned long r26; /* gp */
41
42 unsigned long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0;
43
44 unsigned long sp; /* User/Kernel depending on where we came from */
45 unsigned long orig_r0;
46
47 /*
48 * To distinguish bet excp, syscall, irq
49 * For traps and exceptions, Exception Cause Register.
50 * ECR: <00> <VV> <CC> <PP>
51 * Last word used by Linux for extra state mgmt (syscall-restart)
52 * For interrupts, use artificial ECR values to note current prio-level
53 */
54 ecr_reg ecr;
55};
56
57struct callee_regs {
58 unsigned long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13;
59};
60
61#define MAX_REG_OFFSET offsetof(struct pt_regs, ecr)
62
63#else
64
65struct pt_regs {
66
67 unsigned long orig_r0;
68
69 ecr_reg ecr; /* Exception Cause Reg */
70
71 unsigned long bta; /* erbta */
72
73 unsigned long fp;
74 unsigned long r30;
75 unsigned long r12;
76 unsigned long r26; /* gp */
77
78#ifdef CONFIG_ARC_HAS_ACCL_REGS
79 unsigned long r58, r59; /* ACCL/ACCH used by FPU / DSP MPY */
80#endif
81#ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS
82 unsigned long DSP_CTRL;
83#endif
84
85 unsigned long sp; /* user/kernel sp depending on entry */
86
87 /*------- Below list auto saved by h/w -----------*/
88 unsigned long r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11;
89
90 unsigned long blink;
91 unsigned long lp_end, lp_start, lp_count;
92
93 unsigned long ei, ldi, jli;
94
95 unsigned long ret;
96 unsigned long status32;
97};
98
99struct callee_regs {
100 unsigned long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13;
101};
102
103#define MAX_REG_OFFSET offsetof(struct pt_regs, status32)
104
105#endif
106
107#define instruction_pointer(regs) ((regs)->ret)
108#define profile_pc(regs) instruction_pointer(regs)
109
110/* return 1 if user mode or 0 if kernel mode */
111#define user_mode(regs) (regs->status32 & STATUS_U_MASK)
112
113#define user_stack_pointer(regs)\
114({ unsigned int sp; \
115 if (user_mode(regs)) \
116 sp = (regs)->sp;\
117 else \
118 sp = -1; \
119 sp; \
120})
121
122/* return 1 if PC in delay slot */
123#define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK)
124
125#define in_syscall(regs) ((regs->ecr.vec == ECR_V_TRAP) && !regs->ecr.param)
126#define in_brkpt_trap(regs) ((regs->ecr.vec == ECR_V_TRAP) && regs->ecr.param)
127
128#define STATE_SCALL_RESTARTED 0x01
129
130#define syscall_wont_restart(regs) (regs->ecr.state |= STATE_SCALL_RESTARTED)
131#define syscall_restartable(regs) !(regs->ecr.state & STATE_SCALL_RESTARTED)
132
133#define current_pt_regs() \
134({ \
135 /* open-coded current_thread_info() */ \
136 register unsigned long sp asm ("sp"); \
137 unsigned long pg_start = (sp & ~(THREAD_SIZE - 1)); \
138 (struct pt_regs *)(pg_start + THREAD_SIZE) - 1; \
139})
140
141static inline long regs_return_value(struct pt_regs *regs)
142{
143 return (long)regs->r0;
144}
145
146static inline void instruction_pointer_set(struct pt_regs *regs,
147 unsigned long val)
148{
149 instruction_pointer(regs) = val;
150}
151
152static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
153{
154 return regs->sp;
155}
156
157extern int regs_query_register_offset(const char *name);
158extern const char *regs_query_register_name(unsigned int offset);
159extern bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr);
160extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
161 unsigned int n);
162
163static inline unsigned long regs_get_register(struct pt_regs *regs,
164 unsigned int offset)
165{
166 if (unlikely(offset > MAX_REG_OFFSET))
167 return 0;
168
169 return *(unsigned long *)((unsigned long)regs + offset);
170}
171
172extern int syscall_trace_entry(struct pt_regs *);
173extern void syscall_trace_exit(struct pt_regs *);
174
175#endif /* !__ASSEMBLY__ */
176
177#endif /* __ASM_PTRACE_H */
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
4 *
5 * Amit Bhor, Sameer Dhavale: Codito Technologies 2004
6 */
7#ifndef __ASM_ARC_PTRACE_H
8#define __ASM_ARC_PTRACE_H
9
10#include <uapi/asm/ptrace.h>
11#include <linux/compiler.h>
12
13#ifndef __ASSEMBLY__
14
15/* THE pt_regs: Defines how regs are saved during entry into kernel */
16
17#ifdef CONFIG_ISA_ARCOMPACT
18struct pt_regs {
19
20 /* Real registers */
21 unsigned long bta; /* bta_l1, bta_l2, erbta */
22
23 unsigned long lp_start, lp_end, lp_count;
24
25 unsigned long status32; /* status32_l1, status32_l2, erstatus */
26 unsigned long ret; /* ilink1, ilink2 or eret */
27 unsigned long blink;
28 unsigned long fp;
29 unsigned long r26; /* gp */
30
31 unsigned long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0;
32
33 unsigned long sp; /* User/Kernel depending on where we came from */
34 unsigned long orig_r0;
35
36 /*
37 * To distinguish bet excp, syscall, irq
38 * For traps and exceptions, Exception Cause Register.
39 * ECR: <00> <VV> <CC> <PP>
40 * Last word used by Linux for extra state mgmt (syscall-restart)
41 * For interrupts, use artificial ECR values to note current prio-level
42 */
43 union {
44 struct {
45#ifdef CONFIG_CPU_BIG_ENDIAN
46 unsigned long state:8, ecr_vec:8,
47 ecr_cause:8, ecr_param:8;
48#else
49 unsigned long ecr_param:8, ecr_cause:8,
50 ecr_vec:8, state:8;
51#endif
52 };
53 unsigned long event;
54 };
55
56 unsigned long user_r25;
57};
58
59#define MAX_REG_OFFSET offsetof(struct pt_regs, user_r25)
60
61#else
62
63struct pt_regs {
64
65 unsigned long orig_r0;
66
67 union {
68 struct {
69#ifdef CONFIG_CPU_BIG_ENDIAN
70 unsigned long state:8, ecr_vec:8,
71 ecr_cause:8, ecr_param:8;
72#else
73 unsigned long ecr_param:8, ecr_cause:8,
74 ecr_vec:8, state:8;
75#endif
76 };
77 unsigned long event;
78 };
79
80 unsigned long bta; /* bta_l1, bta_l2, erbta */
81
82 unsigned long user_r25;
83
84 unsigned long r26; /* gp */
85 unsigned long fp;
86 unsigned long sp; /* user/kernel sp depending on where we came from */
87
88 unsigned long r12, r30;
89
90#ifdef CONFIG_ARC_HAS_ACCL_REGS
91 unsigned long r58, r59; /* ACCL/ACCH used by FPU / DSP MPY */
92#endif
93#ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS
94 unsigned long DSP_CTRL;
95#endif
96
97 /*------- Below list auto saved by h/w -----------*/
98 unsigned long r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11;
99
100 unsigned long blink;
101 unsigned long lp_end, lp_start, lp_count;
102
103 unsigned long ei, ldi, jli;
104
105 unsigned long ret;
106 unsigned long status32;
107};
108
109#define MAX_REG_OFFSET offsetof(struct pt_regs, status32)
110
111#endif
112
113/* Callee saved registers - need to be saved only when you are scheduled out */
114
115struct callee_regs {
116 unsigned long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13;
117};
118
119#define instruction_pointer(regs) ((regs)->ret)
120#define profile_pc(regs) instruction_pointer(regs)
121
122/* return 1 if user mode or 0 if kernel mode */
123#define user_mode(regs) (regs->status32 & STATUS_U_MASK)
124
125#define user_stack_pointer(regs)\
126({ unsigned int sp; \
127 if (user_mode(regs)) \
128 sp = (regs)->sp;\
129 else \
130 sp = -1; \
131 sp; \
132})
133
134/* return 1 if PC in delay slot */
135#define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK)
136
137#define in_syscall(regs) ((regs->ecr_vec == ECR_V_TRAP) && !regs->ecr_param)
138#define in_brkpt_trap(regs) ((regs->ecr_vec == ECR_V_TRAP) && regs->ecr_param)
139
140#define STATE_SCALL_RESTARTED 0x01
141
142#define syscall_wont_restart(reg) (reg->state |= STATE_SCALL_RESTARTED)
143#define syscall_restartable(reg) !(reg->state & STATE_SCALL_RESTARTED)
144
145#define current_pt_regs() \
146({ \
147 /* open-coded current_thread_info() */ \
148 register unsigned long sp asm ("sp"); \
149 unsigned long pg_start = (sp & ~(THREAD_SIZE - 1)); \
150 (struct pt_regs *)(pg_start + THREAD_SIZE) - 1; \
151})
152
153static inline long regs_return_value(struct pt_regs *regs)
154{
155 return (long)regs->r0;
156}
157
158static inline void instruction_pointer_set(struct pt_regs *regs,
159 unsigned long val)
160{
161 instruction_pointer(regs) = val;
162}
163
164static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
165{
166 return regs->sp;
167}
168
169extern int regs_query_register_offset(const char *name);
170extern const char *regs_query_register_name(unsigned int offset);
171extern bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr);
172extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
173 unsigned int n);
174
175static inline unsigned long regs_get_register(struct pt_regs *regs,
176 unsigned int offset)
177{
178 if (unlikely(offset > MAX_REG_OFFSET))
179 return 0;
180
181 return *(unsigned long *)((unsigned long)regs + offset);
182}
183
184#endif /* !__ASSEMBLY__ */
185
186#endif /* __ASM_PTRACE_H */