1
2#ifndef _ASM_S390_STACKTRACE_H
3#define _ASM_S390_STACKTRACE_H
4
5#include <linux/uaccess.h>
6#include <linux/ptrace.h>
7#include <asm/switch_to.h>
8
9enum stack_type {
10 STACK_TYPE_UNKNOWN,
11 STACK_TYPE_TASK,
12 STACK_TYPE_IRQ,
13 STACK_TYPE_NODAT,
14 STACK_TYPE_RESTART,
15};
16
17struct stack_info {
18 enum stack_type type;
19 unsigned long begin, end;
20};
21
22const char *stack_type_name(enum stack_type type);
23int get_stack_info(unsigned long sp, struct task_struct *task,
24 struct stack_info *info, unsigned long *visit_mask);
25
26static inline bool on_stack(struct stack_info *info,
27 unsigned long addr, size_t len)
28{
29 if (info->type == STACK_TYPE_UNKNOWN)
30 return false;
31 if (addr + len < addr)
32 return false;
33 return addr >= info->begin && addr + len <= info->end;
34}
35
36static __always_inline unsigned long get_stack_pointer(struct task_struct *task,
37 struct pt_regs *regs)
38{
39 if (regs)
40 return (unsigned long) kernel_stack_pointer(regs);
41 if (task == current)
42 return current_stack_pointer();
43 return (unsigned long) task->thread.ksp;
44}
45
46
47
48
49#ifndef __PACK_STACK
50struct stack_frame {
51 unsigned long back_chain;
52 unsigned long empty1[5];
53 unsigned long gprs[10];
54 unsigned int empty2[8];
55};
56#else
57struct stack_frame {
58 unsigned long empty1[5];
59 unsigned int empty2[8];
60 unsigned long gprs[10];
61 unsigned long back_chain;
62};
63#endif
64
65
66
67
68
69
70
71
72#define current_frame_address() \
73 ((unsigned long)__builtin_frame_address(0) - \
74 offsetof(struct stack_frame, back_chain))
75
76#define CALL_ARGS_0() \
77 register unsigned long r2 asm("2")
78#define CALL_ARGS_1(arg1) \
79 register unsigned long r2 asm("2") = (unsigned long)(arg1)
80#define CALL_ARGS_2(arg1, arg2) \
81 CALL_ARGS_1(arg1); \
82 register unsigned long r3 asm("3") = (unsigned long)(arg2)
83#define CALL_ARGS_3(arg1, arg2, arg3) \
84 CALL_ARGS_2(arg1, arg2); \
85 register unsigned long r4 asm("4") = (unsigned long)(arg3)
86#define CALL_ARGS_4(arg1, arg2, arg3, arg4) \
87 CALL_ARGS_3(arg1, arg2, arg3); \
88 register unsigned long r4 asm("5") = (unsigned long)(arg4)
89#define CALL_ARGS_5(arg1, arg2, arg3, arg4, arg5) \
90 CALL_ARGS_4(arg1, arg2, arg3, arg4); \
91 register unsigned long r4 asm("6") = (unsigned long)(arg5)
92
93#define CALL_FMT_0 "=&d" (r2) :
94#define CALL_FMT_1 "+&d" (r2) :
95#define CALL_FMT_2 CALL_FMT_1 "d" (r3),
96#define CALL_FMT_3 CALL_FMT_2 "d" (r4),
97#define CALL_FMT_4 CALL_FMT_3 "d" (r5),
98#define CALL_FMT_5 CALL_FMT_4 "d" (r6),
99
100#define CALL_CLOBBER_5 "0", "1", "14", "cc", "memory"
101#define CALL_CLOBBER_4 CALL_CLOBBER_5
102#define CALL_CLOBBER_3 CALL_CLOBBER_4, "5"
103#define CALL_CLOBBER_2 CALL_CLOBBER_3, "4"
104#define CALL_CLOBBER_1 CALL_CLOBBER_2, "3"
105#define CALL_CLOBBER_0 CALL_CLOBBER_1
106
107#define CALL_ON_STACK(fn, stack, nr, args...) \
108({ \
109 unsigned long frame = current_frame_address(); \
110 CALL_ARGS_##nr(args); \
111 unsigned long prev; \
112 \
113 asm volatile( \
114 " la %[_prev],0(15)\n" \
115 " lg 15,%[_stack]\n" \
116 " stg %[_frame],%[_bc](15)\n" \
117 " brasl 14,%[_fn]\n" \
118 " la 15,0(%[_prev])\n" \
119 : [_prev] "=&a" (prev), CALL_FMT_##nr \
120 [_stack] "R" (stack), \
121 [_bc] "i" (offsetof(struct stack_frame, back_chain)), \
122 [_frame] "d" (frame), \
123 [_fn] "X" (fn) : CALL_CLOBBER_##nr); \
124 r2; \
125})
126
127#define CALL_ON_STACK_NORETURN(fn, stack) \
128({ \
129 asm volatile( \
130 " la 15,0(%[_stack])\n" \
131 " xc %[_bc](8,15),%[_bc](15)\n" \
132 " brasl 14,%[_fn]\n" \
133 ::[_bc] "i" (offsetof(struct stack_frame, back_chain)), \
134 [_stack] "a" (stack), [_fn] "X" (fn)); \
135 BUG(); \
136})
137
138#endif
139
