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
  10 extern int raw_show_trace;
  11 extern unsigned long unwind_stack(struct task_struct *task, unsigned long *sp,
  12                                   unsigned long pc, unsigned long *ra);
  13 extern 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
  19 static 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
  34 static __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 */