Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
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 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 * Stack layout of a C stack frame.
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#define CALL_ARGS_0() \
66 register unsigned long r2 asm("2")
67#define CALL_ARGS_1(arg1) \
68 register unsigned long r2 asm("2") = (unsigned long)(arg1)
69#define CALL_ARGS_2(arg1, arg2) \
70 CALL_ARGS_1(arg1); \
71 register unsigned long r3 asm("3") = (unsigned long)(arg2)
72#define CALL_ARGS_3(arg1, arg2, arg3) \
73 CALL_ARGS_2(arg1, arg2); \
74 register unsigned long r4 asm("4") = (unsigned long)(arg3)
75#define CALL_ARGS_4(arg1, arg2, arg3, arg4) \
76 CALL_ARGS_3(arg1, arg2, arg3); \
77 register unsigned long r4 asm("5") = (unsigned long)(arg4)
78#define CALL_ARGS_5(arg1, arg2, arg3, arg4, arg5) \
79 CALL_ARGS_4(arg1, arg2, arg3, arg4); \
80 register unsigned long r4 asm("6") = (unsigned long)(arg5)
81
82#define CALL_FMT_0 "=&d" (r2) :
83#define CALL_FMT_1 "+&d" (r2) :
84#define CALL_FMT_2 CALL_FMT_1 "d" (r3),
85#define CALL_FMT_3 CALL_FMT_2 "d" (r4),
86#define CALL_FMT_4 CALL_FMT_3 "d" (r5),
87#define CALL_FMT_5 CALL_FMT_4 "d" (r6),
88
89#define CALL_CLOBBER_5 "0", "1", "14", "cc", "memory"
90#define CALL_CLOBBER_4 CALL_CLOBBER_5
91#define CALL_CLOBBER_3 CALL_CLOBBER_4, "5"
92#define CALL_CLOBBER_2 CALL_CLOBBER_3, "4"
93#define CALL_CLOBBER_1 CALL_CLOBBER_2, "3"
94#define CALL_CLOBBER_0 CALL_CLOBBER_1
95
96#define CALL_ON_STACK(fn, stack, nr, args...) \
97({ \
98 CALL_ARGS_##nr(args); \
99 unsigned long prev; \
100 \
101 asm volatile( \
102 " la %[_prev],0(15)\n" \
103 " la 15,0(%[_stack])\n" \
104 " stg %[_prev],%[_bc](15)\n" \
105 " brasl 14,%[_fn]\n" \
106 " la 15,0(%[_prev])\n" \
107 : [_prev] "=&a" (prev), CALL_FMT_##nr \
108 [_stack] "a" (stack), \
109 [_bc] "i" (offsetof(struct stack_frame, back_chain)), \
110 [_fn] "X" (fn) : CALL_CLOBBER_##nr); \
111 r2; \
112})
113
114#endif /* _ASM_S390_STACKTRACE_H */