LXR linux/arch/s390/include/asm/stacktrace.h

   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 */
 115