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
18 struct 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
63 struct 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
115 struct 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
regs_return_value(struct pt_regs * regs)153 static inline long regs_return_value(struct pt_regs *regs)
154 {
155 return (long)regs->r0;
156 }
157
instruction_pointer_set(struct pt_regs * regs,unsigned long val)158 static inline void instruction_pointer_set(struct pt_regs *regs,
159 unsigned long val)
160 {
161 instruction_pointer(regs) = val;
162 }
163
kernel_stack_pointer(struct pt_regs * regs)164 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
165 {
166 return regs->sp;
167 }
168
169 extern int regs_query_register_offset(const char *name);
170 extern const char *regs_query_register_name(unsigned int offset);
171 extern bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr);
172 extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
173 unsigned int n);
174
regs_get_register(struct pt_regs * regs,unsigned int offset)175 static 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 */
187