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 */
95
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