1/*
2 * Copyright (C) 1999, 2000  Niibe Yutaka
3 */
4#ifndef __ASM_SH_PTRACE_H
5#define __ASM_SH_PTRACE_H
6
7
8#include <linux/stringify.h>
9#include <linux/stddef.h>
10#include <linux/thread_info.h>
11#include <asm/addrspace.h>
12#include <asm/page.h>
13#include <uapi/asm/ptrace.h>
14
15#define user_mode(regs)			(((regs)->sr & 0x40000000)==0)
16#define kernel_stack_pointer(_regs)	((unsigned long)(_regs)->regs[15])
17
18#define GET_FP(regs)	((regs)->regs[14])
19#define GET_USP(regs)	((regs)->regs[15])
20
21#define arch_has_single_step()	(1)
22
23/*
24 * kprobe-based event tracer support
25 */
26struct pt_regs_offset {
27	const char *name;
28	int offset;
29};
30
31#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
32#define REGS_OFFSET_NAME(num)	\
33	{.name = __stringify(r##num), .offset = offsetof(struct pt_regs, regs[num])}
34#define TREGS_OFFSET_NAME(num)	\
35	{.name = __stringify(tr##num), .offset = offsetof(struct pt_regs, tregs[num])}
36#define REG_OFFSET_END {.name = NULL, .offset = 0}
37
38/* Query offset/name of register from its name/offset */
39extern int regs_query_register_offset(const char *name);
40extern const char *regs_query_register_name(unsigned int offset);
41
42extern const struct pt_regs_offset regoffset_table[];
43
44/**
45 * regs_get_register() - get register value from its offset
46 * @regs:	pt_regs from which register value is gotten.
47 * @offset:	offset number of the register.
48 *
49 * regs_get_register returns the value of a register. The @offset is the
50 * offset of the register in struct pt_regs address which specified by @regs.
51 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
52 */
53static inline unsigned long regs_get_register(struct pt_regs *regs,
54					      unsigned int offset)
55{
56	if (unlikely(offset > MAX_REG_OFFSET))
57		return 0;
58	return *(unsigned long *)((unsigned long)regs + offset);
59}
60
61/**
62 * regs_within_kernel_stack() - check the address in the stack
63 * @regs:	pt_regs which contains kernel stack pointer.
64 * @addr:	address which is checked.
65 *
66 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
67 * If @addr is within the kernel stack, it returns true. If not, returns false.
68 */
69static inline int regs_within_kernel_stack(struct pt_regs *regs,
70					   unsigned long addr)
71{
72	return ((addr & ~(THREAD_SIZE - 1))  ==
73		(kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
74}
75
76/**
77 * regs_get_kernel_stack_nth() - get Nth entry of the stack
78 * @regs:	pt_regs which contains kernel stack pointer.
79 * @n:		stack entry number.
80 *
81 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
82 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
83 * this returns 0.
84 */
85static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
86						      unsigned int n)
87{
88	unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
89	addr += n;
90	if (regs_within_kernel_stack(regs, (unsigned long)addr))
91		return *addr;
92	else
93		return 0;
94}
95
96struct perf_event;
97struct perf_sample_data;
98
99extern void ptrace_triggered(struct perf_event *bp,
100		      struct perf_sample_data *data, struct pt_regs *regs);
101
102#define task_pt_regs(task) \
103	((struct pt_regs *) (task_stack_page(task) + THREAD_SIZE) - 1)
104
105static inline unsigned long profile_pc(struct pt_regs *regs)
106{
107	unsigned long pc = regs->pc;
108
109	if (virt_addr_uncached(pc))
110		return CAC_ADDR(pc);
111
112	return pc;
113}
114#define profile_pc profile_pc
115
116#include <asm-generic/ptrace.h>
117#endif /* __ASM_SH_PTRACE_H */
118