aboutsummaryrefslogtreecommitdiff
path: root/arch/sh/include/asm/ptrace.h
blob: a4a38dff997adc4e01b50188d5ef5df796f0644f (plain)
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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
#ifndef __ASM_SH_PTRACE_H
#define __ASM_SH_PTRACE_H

/*
 * Copyright (C) 1999, 2000  Niibe Yutaka
 */

#define PTRACE_GETREGS		12	/* General registers */
#define PTRACE_SETREGS		13

#define PTRACE_GETFPREGS	14	/* FPU registers */
#define PTRACE_SETFPREGS	15

#define PTRACE_GETFDPIC		31	/* get the ELF fdpic loadmap address */

#define PTRACE_GETFDPIC_EXEC	0	/* [addr] request the executable loadmap */
#define PTRACE_GETFDPIC_INTERP	1	/* [addr] request the interpreter loadmap */

#define	PTRACE_GETDSPREGS	55	/* DSP registers */
#define	PTRACE_SETDSPREGS	56

#define PT_TEXT_END_ADDR	240
#define PT_TEXT_ADDR		244	/* &(struct user)->start_code */
#define PT_DATA_ADDR		248	/* &(struct user)->start_data */
#define PT_TEXT_LEN		252

#if defined(__SH5__) || defined(CONFIG_CPU_SH5)
#include <asm/ptrace_64.h>
#else
#include <asm/ptrace_32.h>
#endif

#ifdef __KERNEL__

#include <linux/stringify.h>
#include <linux/stddef.h>
#include <linux/thread_info.h>
#include <asm/addrspace.h>
#include <asm/page.h>

#define user_mode(regs)			(((regs)->sr & 0x40000000)==0)
#define kernel_stack_pointer(_regs)	((unsigned long)(_regs)->regs[15])

#define GET_FP(regs)	((regs)->regs[14])
#define GET_USP(regs)	((regs)->regs[15])

#define arch_has_single_step()	(1)

/*
 * kprobe-based event tracer support
 */
struct pt_regs_offset {
	const char *name;
	int offset;
};

#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
#define REGS_OFFSET_NAME(num)	\
	{.name = __stringify(r##num), .offset = offsetof(struct pt_regs, regs[num])}
#define TREGS_OFFSET_NAME(num)	\
	{.name = __stringify(tr##num), .offset = offsetof(struct pt_regs, tregs[num])}
#define REG_OFFSET_END {.name = NULL, .offset = 0}

/* Query offset/name of register from its name/offset */
extern int regs_query_register_offset(const char *name);
extern const char *regs_query_register_name(unsigned int offset);

extern const struct pt_regs_offset regoffset_table[];

/**
 * regs_get_register() - get register value from its offset
 * @regs:	pt_regs from which register value is gotten.
 * @offset:	offset number of the register.
 *
 * regs_get_register returns the value of a register. The @offset is the
 * offset of the register in struct pt_regs address which specified by @regs.
 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
 */
static inline unsigned long regs_get_register(struct pt_regs *regs,
					      unsigned int offset)
{
	if (unlikely(offset > MAX_REG_OFFSET))
		return 0;
	return *(unsigned long *)((unsigned long)regs + offset);
}

/**
 * regs_within_kernel_stack() - check the address in the stack
 * @regs:	pt_regs which contains kernel stack pointer.
 * @addr:	address which is checked.
 *
 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
 * If @addr is within the kernel stack, it returns true. If not, returns false.
 */
static inline int regs_within_kernel_stack(struct pt_regs *regs,
					   unsigned long addr)
{
	return ((addr & ~(THREAD_SIZE - 1))  ==
		(kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
}

/**
 * regs_get_kernel_stack_nth() - get Nth entry of the stack
 * @regs:	pt_regs which contains kernel stack pointer.
 * @n:		stack entry number.
 *
 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
 * this returns 0.
 */
static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
						      unsigned int n)
{
	unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
	addr += n;
	if (regs_within_kernel_stack(regs, (unsigned long)addr))
		return *addr;
	else
		return 0;
}

struct perf_event;
struct perf_sample_data;

extern void ptrace_triggered(struct perf_event *bp,
		      struct perf_sample_data *data, struct pt_regs *regs);

#define task_pt_regs(task) \
	((struct pt_regs *) (task_stack_page(task) + THREAD_SIZE) - 1)

static inline unsigned long profile_pc(struct pt_regs *regs)
{
	unsigned long pc = regs->pc;

	if (virt_addr_uncached(pc))
		return CAC_ADDR(pc);

	return pc;
}
#define profile_pc profile_pc

#include <asm-generic/ptrace.h>
#endif /* __KERNEL__ */

#endif /* __ASM_SH_PTRACE_H */