aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arc/include/asm/ptrace.h
blob: 6179de7e07c21ca4875017adc1107c0e7b0b46c4 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
/*
 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Amit Bhor, Sameer Dhavale: Codito Technologies 2004
 */
#ifndef __ASM_ARC_PTRACE_H
#define __ASM_ARC_PTRACE_H

#include <uapi/asm/ptrace.h>

#ifndef __ASSEMBLY__

/* THE pt_regs: Defines how regs are saved during entry into kernel */

struct pt_regs {
	/*
	 * 1 word gutter after reg-file has been saved
	 * Technically not needed, Since SP always points to a "full" location
	 * (vs. "empty"). But pt_regs is shared with tools....
	 */
	long res;

	/* Real registers */
	long bta;	/* bta_l1, bta_l2, erbta */
	long lp_start;
	long lp_end;
	long lp_count;
	long status32;	/* status32_l1, status32_l2, erstatus */
	long ret;	/* ilink1, ilink2 or eret */
	long blink;
	long fp;
	long r26;	/* gp */
	long r12;
	long r11;
	long r10;
	long r9;
	long r8;
	long r7;
	long r6;
	long r5;
	long r4;
	long r3;
	long r2;
	long r1;
	long r0;
	long sp;	/* user/kernel sp depending on where we came from  */
	long orig_r0;

	/*to distinguish bet excp, syscall, irq */
	union {
#ifdef CONFIG_CPU_BIG_ENDIAN
		/* so that assembly code is same for LE/BE */
		unsigned long orig_r8:16, event:16;
#else
		unsigned long event:16, orig_r8:16;
#endif
		long orig_r8_word;
	};
};

/* Callee saved registers - need to be saved only when you are scheduled out */

struct callee_regs {
	long res;	/* Again this is not needed */
	long r25;
	long r24;
	long r23;
	long r22;
	long r21;
	long r20;
	long r19;
	long r18;
	long r17;
	long r16;
	long r15;
	long r14;
	long r13;
};

#define instruction_pointer(regs)	((regs)->ret)
#define profile_pc(regs)		instruction_pointer(regs)

/* return 1 if user mode or 0 if kernel mode */
#define user_mode(regs) (regs->status32 & STATUS_U_MASK)

#define user_stack_pointer(regs)\
({  unsigned int sp;		\
	if (user_mode(regs))	\
		sp = (regs)->sp;\
	else			\
		sp = -1;	\
	sp;			\
})

/* return 1 if PC in delay slot */
#define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK)

#define in_syscall(regs)    (regs->event & orig_r8_IS_SCALL)
#define in_brkpt_trap(regs) (regs->event & orig_r8_IS_BRKPT)

#define syscall_wont_restart(regs) (regs->event |= orig_r8_IS_SCALL_RESTARTED)
#define syscall_restartable(regs) !(regs->event &  orig_r8_IS_SCALL_RESTARTED)

#define current_pt_regs()					\
({								\
	/* open-coded current_thread_info() */			\
	register unsigned long sp asm ("sp");			\
	unsigned long pg_start = (sp & ~(THREAD_SIZE - 1));	\
	(struct pt_regs *)(pg_start + THREAD_SIZE - 4) - 1;	\
})

static inline long regs_return_value(struct pt_regs *regs)
{
	return regs->r0;
}

#endif /* !__ASSEMBLY__ */

#define orig_r8_IS_SCALL		0x0001
#define orig_r8_IS_SCALL_RESTARTED	0x0002
#define orig_r8_IS_BRKPT		0x0004
#define orig_r8_IS_EXCPN		0x0008
#define orig_r8_IS_IRQ1			0x0010
#define orig_r8_IS_IRQ2			0x0020

#endif /* __ASM_PTRACE_H */