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 */
178