1/*
2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * Amit Bhor, Sameer Dhavale: Codito Technologies 2004
9 */
10#ifndef __ASM_ARC_PTRACE_H
11#define __ASM_ARC_PTRACE_H
12
13#include <uapi/asm/ptrace.h>
14
15#ifndef __ASSEMBLY__
16
17/* THE pt_regs: Defines how regs are saved during entry into kernel */
18
19struct pt_regs {
20
21	/* Real registers */
22	long bta;	/* bta_l1, bta_l2, erbta */
23
24	long lp_start, lp_end, lp_count;
25
26	long status32;	/* status32_l1, status32_l2, erstatus */
27	long ret;	/* ilink1, ilink2 or eret */
28	long blink;
29	long fp;
30	long r26;	/* gp */
31
32	long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0;
33
34	long sp;	/* user/kernel sp depending on where we came from  */
35	long orig_r0;
36
37	/*
38	 * To distinguish bet excp, syscall, irq
39	 * For traps and exceptions, Exception Cause Register.
40	 * 	ECR: <00> <VV> <CC> <PP>
41	 * 	Last word used by Linux for extra state mgmt (syscall-restart)
42	 * For interrupts, use artificial ECR values to note current prio-level
43	 */
44	union {
45		struct {
46#ifdef CONFIG_CPU_BIG_ENDIAN
47			unsigned long state:8, ecr_vec:8,
48				      ecr_cause:8, ecr_param:8;
49#else
50			unsigned long ecr_param:8, ecr_cause:8,
51				      ecr_vec:8, state:8;
52#endif
53		};
54		unsigned long event;
55	};
56
57	long user_r25;
58};
59
60/* Callee saved registers - need to be saved only when you are scheduled out */
61
62struct callee_regs {
63	long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13;
64};
65
66#define instruction_pointer(regs)	(unsigned long)((regs)->ret)
67#define profile_pc(regs)		instruction_pointer(regs)
68
69/* return 1 if user mode or 0 if kernel mode */
70#define user_mode(regs) (regs->status32 & STATUS_U_MASK)
71
72#define user_stack_pointer(regs)\
73({  unsigned int sp;		\
74	if (user_mode(regs))	\
75		sp = (regs)->sp;\
76	else			\
77		sp = -1;	\
78	sp;			\
79})
80
81/* return 1 if PC in delay slot */
82#define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK)
83
84#define in_syscall(regs)    ((regs->ecr_vec == ECR_V_TRAP) && !regs->ecr_param)
85#define in_brkpt_trap(regs) ((regs->ecr_vec == ECR_V_TRAP) && regs->ecr_param)
86
87#define STATE_SCALL_RESTARTED	0x01
88
89#define syscall_wont_restart(reg) (reg->state |= STATE_SCALL_RESTARTED)
90#define syscall_restartable(reg) !(reg->state &  STATE_SCALL_RESTARTED)
91
92#define current_pt_regs()					\
93({								\
94	/* open-coded current_thread_info() */			\
95	register unsigned long sp asm ("sp");			\
96	unsigned long pg_start = (sp & ~(THREAD_SIZE - 1));	\
97	(struct pt_regs *)(pg_start + THREAD_SIZE) - 1;	\
98})
99
100static inline long regs_return_value(struct pt_regs *regs)
101{
102	return regs->r0;
103}
104
105#endif /* !__ASSEMBLY__ */
106
107#endif /* __ASM_PTRACE_H */
108