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
14 enum stack_type {
15 STACK_TYPE_UNKNOWN,
16 STACK_TYPE_IRQ,
17 STACK_TYPE_TASK,
18 };
19
20 struct stack_info {
21 enum stack_type type;
22 unsigned long begin, end, next_sp;
23 };
24
25 struct stack_frame {
26 unsigned long fp;
27 unsigned long ra;
28 };
29
30 bool in_irq_stack(unsigned long stack, struct stack_info *info);
31 bool in_task_stack(unsigned long stack, struct task_struct *task, struct stack_info *info);
32 int get_stack_info(unsigned long stack, struct task_struct *task, struct stack_info *info);
33
on_thread_stack(void)34 static __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
prepare_frametrace(struct pt_regs * regs)49 static __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 */
103