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 */
26 struct 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 */
39 extern int regs_query_register_offset(const char *name);
40 extern const char *regs_query_register_name(unsigned int offset);
41
42 extern 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 */
regs_get_register(struct pt_regs * regs,unsigned int offset)53 static 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 */
regs_within_kernel_stack(struct pt_regs * regs,unsigned long addr)69 static 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 */
regs_get_kernel_stack_nth(struct pt_regs * regs,unsigned int n)85 static 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
96 struct perf_event;
97 struct perf_sample_data;
98
99 extern 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
profile_pc(struct pt_regs * regs)105 static 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