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 <asm/unwind_hints.h>
 12#include <linux/stringify.h>
 13
 14enum stack_type {
 15	STACK_TYPE_UNKNOWN,
 16	STACK_TYPE_IRQ,
 17	STACK_TYPE_TASK,
 18};
 19
 20struct stack_info {
 21	enum stack_type type;
 22	unsigned long begin, end, next_sp;
 23};
 24
 25struct stack_frame {
 26	unsigned long	fp;
 27	unsigned long	ra;
 28};
 29
 30bool in_irq_stack(unsigned long stack, struct stack_info *info);
 31bool in_task_stack(unsigned long stack, struct task_struct *task, struct stack_info *info);
 32int get_stack_info(unsigned long stack, struct task_struct *task, struct stack_info *info);
 33
 34static __always_inline bool on_thread_stack(void)
 35{
 36	return !(((unsigned long)(current->stack) ^ current_stack_pointer) & ~(THREAD_SIZE - 1));
 37}
 38
 39#define STR_LONG_L    __stringify(LONG_L)
 40#define STR_LONG_S    __stringify(LONG_S)
 41#define STR_LONGSIZE  __stringify(LONGSIZE)
 42
 43#define STORE_ONE_REG(r) \
 44    STR_LONG_S   " $r" __stringify(r)", %1, "STR_LONGSIZE"*"__stringify(r)"\n\t"
 45
 46#define CSRRD_ONE_REG(reg) \
 47    __stringify(csrrd) " %0, "__stringify(reg)"\n\t"
 48
 49static __always_inline void prepare_frametrace(struct pt_regs *regs)
 50{
 51	__asm__ __volatile__(
 52		UNWIND_HINT_SAVE
 53		/* Save $ra */
 54		STORE_ONE_REG(1)
 55		/* Use $ra to save PC */
 56		"pcaddi	$ra, 0\n\t"
 57		STR_LONG_S " $ra, %0\n\t"
 58		/* Restore $ra */
 59		STR_LONG_L " $ra, %1, "STR_LONGSIZE"\n\t"
 60		STORE_ONE_REG(2)
 61		STORE_ONE_REG(3)
 62		STORE_ONE_REG(4)
 63		STORE_ONE_REG(5)
 64		STORE_ONE_REG(6)
 65		STORE_ONE_REG(7)
 66		STORE_ONE_REG(8)
 67		STORE_ONE_REG(9)
 68		STORE_ONE_REG(10)
 69		STORE_ONE_REG(11)
 70		STORE_ONE_REG(12)
 71		STORE_ONE_REG(13)
 72		STORE_ONE_REG(14)
 73		STORE_ONE_REG(15)
 74		STORE_ONE_REG(16)
 75		STORE_ONE_REG(17)
 76		STORE_ONE_REG(18)
 77		STORE_ONE_REG(19)
 78		STORE_ONE_REG(20)
 79		STORE_ONE_REG(21)
 80		STORE_ONE_REG(22)
 81		STORE_ONE_REG(23)
 82		STORE_ONE_REG(24)
 83		STORE_ONE_REG(25)
 84		STORE_ONE_REG(26)
 85		STORE_ONE_REG(27)
 86		STORE_ONE_REG(28)
 87		STORE_ONE_REG(29)
 88		STORE_ONE_REG(30)
 89		STORE_ONE_REG(31)
 90		UNWIND_HINT_RESTORE
 91		: "=m" (regs->csr_era)
 92		: "r" (regs->regs)
 93		: "memory");
 94	__asm__ __volatile__(CSRRD_ONE_REG(LOONGARCH_CSR_BADV) : "=r" (regs->csr_badvaddr));
 95	__asm__ __volatile__(CSRRD_ONE_REG(LOONGARCH_CSR_CRMD) : "=r" (regs->csr_crmd));
 96	__asm__ __volatile__(CSRRD_ONE_REG(LOONGARCH_CSR_PRMD) : "=r" (regs->csr_prmd));
 97	__asm__ __volatile__(CSRRD_ONE_REG(LOONGARCH_CSR_EUEN) : "=r" (regs->csr_euen));
 98	__asm__ __volatile__(CSRRD_ONE_REG(LOONGARCH_CSR_ECFG) : "=r" (regs->csr_ecfg));
 99	__asm__ __volatile__(CSRRD_ONE_REG(LOONGARCH_CSR_ESTAT) : "=r" (regs->csr_estat));
100}
101
102#endif /* _ASM_STACKTRACE_H */