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

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_STACKTRACE_H
   3#define _ASM_STACKTRACE_H
   4
   5#include <asm/ptrace.h>
   6#include <asm/asm.h>
   7#include <linux/stringify.h>
   8
   9#ifdef CONFIG_KALLSYMS
  10extern int raw_show_trace;
  11extern unsigned long unwind_stack(struct task_struct *task, unsigned long *sp,
  12                                  unsigned long pc, unsigned long *ra);
  13extern unsigned long unwind_stack_by_address(unsigned long stack_page,
  14                                             unsigned long *sp,
  15                                             unsigned long pc,
  16                                             unsigned long *ra);
  17#else
  18#define raw_show_trace 1
  19static inline unsigned long unwind_stack(struct task_struct *task,
  20        unsigned long *sp, unsigned long pc, unsigned long *ra)
  21{
  22        return 0;
  23}
  24#endif
  25
  26#define STR_PTR_LA    __stringify(PTR_LA)
  27#define STR_LONG_S    __stringify(LONG_S)
  28#define STR_LONG_L    __stringify(LONG_L)
  29#define STR_LONGSIZE  __stringify(LONGSIZE)
  30
  31#define STORE_ONE_REG(r) \
  32    STR_LONG_S   " $" __stringify(r)",("STR_LONGSIZE"*"__stringify(r)")(%1)\n\t"
  33
  34static __always_inline void prepare_frametrace(struct pt_regs *regs)
  35{
  36#ifndef CONFIG_KALLSYMS
  37        /*
  38         * Remove any garbage that may be in regs (specially func
  39         * addresses) to avoid show_raw_backtrace() to report them
  40         */
  41        memset(regs, 0, sizeof(*regs));
  42#endif
  43        __asm__ __volatile__(
  44                ".set push\n\t"
  45                ".set noat\n\t"
  46                /* Store $1 so we can use it */
  47                STR_LONG_S " $1,"STR_LONGSIZE"(%1)\n\t"
  48                /* Store the PC */
  49                "1: " STR_PTR_LA " $1, 1b\n\t"
  50                STR_LONG_S " $1,%0\n\t"
  51                STORE_ONE_REG(2)
  52                STORE_ONE_REG(3)
  53                STORE_ONE_REG(4)
  54                STORE_ONE_REG(5)
  55                STORE_ONE_REG(6)
  56                STORE_ONE_REG(7)
  57                STORE_ONE_REG(8)
  58                STORE_ONE_REG(9)
  59                STORE_ONE_REG(10)
  60                STORE_ONE_REG(11)
  61                STORE_ONE_REG(12)
  62                STORE_ONE_REG(13)
  63                STORE_ONE_REG(14)
  64                STORE_ONE_REG(15)
  65                STORE_ONE_REG(16)
  66                STORE_ONE_REG(17)
  67                STORE_ONE_REG(18)
  68                STORE_ONE_REG(19)
  69                STORE_ONE_REG(20)
  70                STORE_ONE_REG(21)
  71                STORE_ONE_REG(22)
  72                STORE_ONE_REG(23)
  73                STORE_ONE_REG(24)
  74                STORE_ONE_REG(25)
  75                STORE_ONE_REG(26)
  76                STORE_ONE_REG(27)
  77                STORE_ONE_REG(28)
  78                STORE_ONE_REG(29)
  79                STORE_ONE_REG(30)
  80                STORE_ONE_REG(31)
  81                /* Restore $1 */
  82                STR_LONG_L " $1,"STR_LONGSIZE"(%1)\n\t"
  83                ".set pop\n\t"
  84                : "=m" (regs->cp0_epc)
  85                : "r" (regs->regs)
  86                : "memory");
  87}
  88
  89#endif /* _ASM_STACKTRACE_H */
  90