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 STACK_TYPE_MCCK,
16};
17
18struct stack_info {
19 enum stack_type type;
20 unsigned long begin, end;
21};
22
23const char *stack_type_name(enum stack_type type);
24int get_stack_info(unsigned long sp, struct task_struct *task,
25 struct stack_info *info, unsigned long *visit_mask);
26
27static inline bool on_stack(struct stack_info *info,
28 unsigned long addr, size_t len)
29{
30 if (info->type == STACK_TYPE_UNKNOWN)
31 return false;
32 if (addr + len < addr)
33 return false;
34 return addr >= info->begin && addr + len <= info->end;
35}
36
37static __always_inline unsigned long get_stack_pointer(struct task_struct *task,
38 struct pt_regs *regs)
39{
40 if (regs)
41 return (unsigned long) kernel_stack_pointer(regs);
42 if (task == current)
43 return current_stack_pointer();
44 return (unsigned long) task->thread.ksp;
45}
46
47
48
49
50#ifndef __PACK_STACK
51struct stack_frame {
52 unsigned long back_chain;
53 unsigned long empty1[5];
54 unsigned long gprs[10];
55 unsigned int empty2[8];
56};
57#else
58struct stack_frame {
59 unsigned long empty1[5];
60 unsigned int empty2[8];
61 unsigned long gprs[10];
62 unsigned long back_chain;
63};
64#endif
65
66
67
68
69
70
71
72
73#define current_frame_address() \
74 ((unsigned long)__builtin_frame_address(0) - \
75 offsetof(struct stack_frame, back_chain))
76
77#define CALL_ARGS_0() \
78 register unsigned long r2 asm("2")
79#define CALL_ARGS_1(arg1) \
80 register unsigned long r2 asm("2") = (unsigned long)(arg1)
81#define CALL_ARGS_2(arg1, arg2) \
82 CALL_ARGS_1(arg1); \
83 register unsigned long r3 asm("3") = (unsigned long)(arg2)
84#define CALL_ARGS_3(arg1, arg2, arg3) \
85 CALL_ARGS_2(arg1, arg2); \
86 register unsigned long r4 asm("4") = (unsigned long)(arg3)
87#define CALL_ARGS_4(arg1, arg2, arg3, arg4) \
88 CALL_ARGS_3(arg1, arg2, arg3); \
89 register unsigned long r4 asm("5") = (unsigned long)(arg4)
90#define CALL_ARGS_5(arg1, arg2, arg3, arg4, arg5) \
91 CALL_ARGS_4(arg1, arg2, arg3, arg4); \
92 register unsigned long r4 asm("6") = (unsigned long)(arg5)
93
94
95
96
97
98#define CALL_FMT_0 "=&d" (r2)
99#define CALL_FMT_1 "+&d" (r2)
100#define CALL_FMT_2 CALL_FMT_1, "+&d" (r3)
101#define CALL_FMT_3 CALL_FMT_2, "+&d" (r4)
102#define CALL_FMT_4 CALL_FMT_3, "+&d" (r5)
103#define CALL_FMT_5 CALL_FMT_4, "+&d" (r6)
104
105#define CALL_CLOBBER_5 "0", "1", "14", "cc", "memory"
106#define CALL_CLOBBER_4 CALL_CLOBBER_5
107#define CALL_CLOBBER_3 CALL_CLOBBER_4, "5"
108#define CALL_CLOBBER_2 CALL_CLOBBER_3, "4"
109#define CALL_CLOBBER_1 CALL_CLOBBER_2, "3"
110#define CALL_CLOBBER_0 CALL_CLOBBER_1
111
112#define CALL_ON_STACK(fn, stack, nr, args...) \
113({ \
114 unsigned long frame = current_frame_address(); \
115 CALL_ARGS_##nr(args); \
116 unsigned long prev; \
117 \
118 asm volatile( \
119 " la %[_prev],0(15)\n" \
120 " lg 15,%[_stack]\n" \
121 " stg %[_frame],%[_bc](15)\n" \
122 " brasl 14,%[_fn]\n" \
123 " la 15,0(%[_prev])\n" \
124 : [_prev] "=&a" (prev), CALL_FMT_##nr \
125 : [_stack] "R" (stack), \
126 [_bc] "i" (offsetof(struct stack_frame, back_chain)), \
127 [_frame] "d" (frame), \
128 [_fn] "X" (fn) : CALL_CLOBBER_##nr); \
129 r2; \
130})
131
132#define CALL_ON_STACK_NORETURN(fn, stack) \
133({ \
134 asm volatile( \
135 " la 15,0(%[_stack])\n" \
136 " xc %[_bc](8,15),%[_bc](15)\n" \
137 " brasl 14,%[_fn]\n" \
138 ::[_bc] "i" (offsetof(struct stack_frame, back_chain)), \
139 [_stack] "a" (stack), [_fn] "X" (fn)); \
140 BUG(); \
141})
142
143#endif
144
