arch/loongarch/include/asm/stacktrace.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
   4  */
   5 #ifndef _ASM_STACKTRACE_H
   6 #define _ASM_STACKTRACE_H
   7
   8 #include <asm/asm.h>
   9 #include <asm/ptrace.h>
  10 #include <asm/loongarch.h>
  11 #include <linux/stringify.h>
  12
  13 enum stack_type {
  14         STACK_TYPE_UNKNOWN,
  15         STACK_TYPE_IRQ,
  16         STACK_TYPE_TASK,
  17 };
  18
  19 struct stack_info {
  20         enum stack_type type;
  21         unsigned long begin, end, next_sp;
  22 };
  23
  24 struct stack_frame {
  25         unsigned long   fp;
  26         unsigned long   ra;
  27 };
  28
  29 bool in_irq_stack(unsigned long stack, struct stack_info *info);
  30 bool in_task_stack(unsigned long stack, struct task_struct *task, struct stack_info *info);
  31 int get_stack_info(unsigned long stack, struct task_struct *task, struct stack_info *info);
  32
  33 #define STR_LONG_L    __stringify(LONG_L)
  34 #define STR_LONG_S    __stringify(LONG_S)
  35 #define STR_LONGSIZE  __stringify(LONGSIZE)
  36
  37 #define STORE_ONE_REG(r) \
  38     STR_LONG_S   " $r" __stringify(r)", %1, "STR_LONGSIZE"*"__stringify(r)"\n\t"
  39
  40 #define CSRRD_ONE_REG(reg) \
  41     __stringify(csrrd) " %0, "__stringify(reg)"\n\t"
  42
  43 static __always_inline void prepare_frametrace(struct pt_regs *regs)
  44 {
  45         __asm__ __volatile__(
  46                 /* Save $ra */
  47                 STORE_ONE_REG(1)
  48                 /* Use $ra to save PC */
  49                 "pcaddi $ra, 0\n\t"
  50                 STR_LONG_S " $ra, %0\n\t"
  51                 /* Restore $ra */
  52                 STR_LONG_L " $ra, %1, "STR_LONGSIZE"\n\t"
  53                 STORE_ONE_REG(2)
  54                 STORE_ONE_REG(3)
  55                 STORE_ONE_REG(4)
  56                 STORE_ONE_REG(5)
  57                 STORE_ONE_REG(6)
  58                 STORE_ONE_REG(7)
  59                 STORE_ONE_REG(8)
  60                 STORE_ONE_REG(9)
  61                 STORE_ONE_REG(10)
  62                 STORE_ONE_REG(11)
  63                 STORE_ONE_REG(12)
  64                 STORE_ONE_REG(13)
  65                 STORE_ONE_REG(14)
  66                 STORE_ONE_REG(15)
  67                 STORE_ONE_REG(16)
  68                 STORE_ONE_REG(17)
  69                 STORE_ONE_REG(18)
  70                 STORE_ONE_REG(19)
  71                 STORE_ONE_REG(20)
  72                 STORE_ONE_REG(21)
  73                 STORE_ONE_REG(22)
  74                 STORE_ONE_REG(23)
  75                 STORE_ONE_REG(24)
  76                 STORE_ONE_REG(25)
  77                 STORE_ONE_REG(26)
  78                 STORE_ONE_REG(27)
  79                 STORE_ONE_REG(28)
  80                 STORE_ONE_REG(29)
  81                 STORE_ONE_REG(30)
  82                 STORE_ONE_REG(31)
  83                 : "=m" (regs->csr_era)
  84                 : "r" (regs->regs)
  85                 : "memory");
  86         __asm__ __volatile__(CSRRD_ONE_REG(LOONGARCH_CSR_BADV) : "=r" (regs->csr_badvaddr));
  87         __asm__ __volatile__(CSRRD_ONE_REG(LOONGARCH_CSR_CRMD) : "=r" (regs->csr_crmd));
  88         __asm__ __volatile__(CSRRD_ONE_REG(LOONGARCH_CSR_PRMD) : "=r" (regs->csr_prmd));
  89         __asm__ __volatile__(CSRRD_ONE_REG(LOONGARCH_CSR_EUEN) : "=r" (regs->csr_euen));
  90         __asm__ __volatile__(CSRRD_ONE_REG(LOONGARCH_CSR_ECFG) : "=r" (regs->csr_ecfg));
  91         __asm__ __volatile__(CSRRD_ONE_REG(LOONGARCH_CSR_ESTAT) : "=r" (regs->csr_estat));
  92 }
  93
  94 #endif /* _ASM_STACKTRACE_H */