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
13enum stack_type {
14	STACK_TYPE_UNKNOWN,
15	STACK_TYPE_IRQ,
16	STACK_TYPE_TASK,
17};
18
19struct stack_info {
20	enum stack_type type;
21	unsigned long begin, end, next_sp;
22};
23
24struct stack_frame {
25	unsigned long	fp;
26	unsigned long	ra;
27};
28
29bool in_irq_stack(unsigned long stack, struct stack_info *info);
30bool in_task_stack(unsigned long stack, struct task_struct *task, struct stack_info *info);
31int 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
43static __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 */
95