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
12#ifndef __ASSEMBLY__
13
14/* THE pt_regs: Defines how regs are saved during entry into kernel */
15
16#ifdef CONFIG_ISA_ARCOMPACT
17struct pt_regs {
18
19	/* Real registers */
20	unsigned long bta;	/* bta_l1, bta_l2, erbta */
21
22	unsigned long lp_start, lp_end, lp_count;
23
24	unsigned long status32;	/* status32_l1, status32_l2, erstatus */
25	unsigned long ret;	/* ilink1, ilink2 or eret */
26	unsigned long blink;
27	unsigned long fp;
28	unsigned long r26;	/* gp */
29
30	unsigned long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0;
31
32	unsigned long sp;	/* User/Kernel depending on where we came from */
33	unsigned long orig_r0;
34
35	/*
36	 * To distinguish bet excp, syscall, irq
37	 * For traps and exceptions, Exception Cause Register.
38	 * 	ECR: <00> <VV> <CC> <PP>
39	 * 	Last word used by Linux for extra state mgmt (syscall-restart)
40	 * For interrupts, use artificial ECR values to note current prio-level
41	 */
42	union {
43		struct {
44#ifdef CONFIG_CPU_BIG_ENDIAN
45			unsigned long state:8, ecr_vec:8,
46				      ecr_cause:8, ecr_param:8;
47#else
48			unsigned long ecr_param:8, ecr_cause:8,
49				      ecr_vec:8, state:8;
50#endif
51		};
52		unsigned long event;
53	};
54
55	unsigned long user_r25;
56};
57#else
58
59struct pt_regs {
60
61	unsigned long orig_r0;
62
63	union {
64		struct {
65#ifdef CONFIG_CPU_BIG_ENDIAN
66			unsigned long state:8, ecr_vec:8,
67				      ecr_cause:8, ecr_param:8;
68#else
69			unsigned long ecr_param:8, ecr_cause:8,
70				      ecr_vec:8, state:8;
71#endif
72		};
73		unsigned long event;
74	};
75
76	unsigned long bta;	/* bta_l1, bta_l2, erbta */
77
78	unsigned long user_r25;
79
80	unsigned long r26;	/* gp */
81	unsigned long fp;
82	unsigned long sp;	/* user/kernel sp depending on where we came from  */
83
84	unsigned long r12, r30;
85
86#ifdef CONFIG_ARC_HAS_ACCL_REGS
87	unsigned long r58, r59;	/* ACCL/ACCH used by FPU / DSP MPY */
88#endif
89#ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS
90	unsigned long DSP_CTRL;
91#endif
92
93	/*------- Below list auto saved by h/w -----------*/
94	unsigned long r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11;
95
96	unsigned long blink;
97	unsigned long lp_end, lp_start, lp_count;
98
99	unsigned long ei, ldi, jli;
100
101	unsigned long ret;
102	unsigned long status32;
103};
104
105#endif
106
107/* Callee saved registers - need to be saved only when you are scheduled out */
108
109struct callee_regs {
110	unsigned long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13;
111};
112
113#define instruction_pointer(regs)	((regs)->ret)
114#define profile_pc(regs)		instruction_pointer(regs)
115
116/* return 1 if user mode or 0 if kernel mode */
117#define user_mode(regs) (regs->status32 & STATUS_U_MASK)
118
119#define user_stack_pointer(regs)\
120({  unsigned int sp;		\
121	if (user_mode(regs))	\
122		sp = (regs)->sp;\
123	else			\
124		sp = -1;	\
125	sp;			\
126})
127
128/* return 1 if PC in delay slot */
129#define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK)
130
131#define in_syscall(regs)    ((regs->ecr_vec == ECR_V_TRAP) && !regs->ecr_param)
132#define in_brkpt_trap(regs) ((regs->ecr_vec == ECR_V_TRAP) && regs->ecr_param)
133
134#define STATE_SCALL_RESTARTED	0x01
135
136#define syscall_wont_restart(reg) (reg->state |= STATE_SCALL_RESTARTED)
137#define syscall_restartable(reg) !(reg->state &  STATE_SCALL_RESTARTED)
138
139#define current_pt_regs()					\
140({								\
141	/* open-coded current_thread_info() */			\
142	register unsigned long sp asm ("sp");			\
143	unsigned long pg_start = (sp & ~(THREAD_SIZE - 1));	\
144	(struct pt_regs *)(pg_start + THREAD_SIZE) - 1;	\
145})
146
147static inline long regs_return_value(struct pt_regs *regs)
148{
149	return (long)regs->r0;
150}
151
152#endif /* !__ASSEMBLY__ */
153
154#endif /* __ASM_PTRACE_H */
155