Line data Source code
1 1 : /*
2 : * Copyright (c) 2016 Jean-Paul Etienne <fractalclone@gmail.com>
3 : * Copyright (c) 2018 Foundries.io Ltd
4 : *
5 : * SPDX-License-Identifier: Apache-2.0
6 : */
7 :
8 : /**
9 : * @file
10 : * @brief RISCV public exception handling
11 : *
12 : * RISCV-specific kernel exception handling interface.
13 : */
14 :
15 : #ifndef ZEPHYR_INCLUDE_ARCH_RISCV_EXCEPTION_H_
16 : #define ZEPHYR_INCLUDE_ARCH_RISCV_EXCEPTION_H_
17 :
18 : #ifndef _ASMLANGUAGE
19 : #include <zephyr/types.h>
20 : #include <zephyr/toolchain.h>
21 :
22 : #ifdef CONFIG_RISCV_SOC_CONTEXT_SAVE
23 : #include <soc_context.h>
24 : #endif
25 :
26 : #ifdef CONFIG_RISCV_SOC_HAS_ISR_STACKING
27 : #include <soc_isr_stacking.h>
28 : #endif
29 :
30 : #ifdef __cplusplus
31 : extern "C" {
32 : #endif
33 :
34 : /*
35 : * The name of the structure which contains soc-specific state, if
36 : * any, as well as the soc_esf_t typedef below, are part of the RISC-V
37 : * arch API.
38 : *
39 : * The contents of the struct are provided by a SOC-specific
40 : * definition in soc_context.h.
41 : */
42 : #ifdef CONFIG_RISCV_SOC_CONTEXT_SAVE
43 : struct soc_esf {
44 : SOC_ESF_MEMBERS;
45 : };
46 : #endif
47 :
48 : #ifdef CONFIG_EXTRA_EXCEPTION_INFO
49 : /* Forward declaration */
50 : struct _callee_saved;
51 : typedef struct _callee_saved _callee_saved_t;
52 : #endif /* CONFIG_EXTRA_EXCEPTION_INFO */
53 :
54 : #if defined(CONFIG_RISCV_SOC_HAS_ISR_STACKING)
55 : SOC_ISR_STACKING_ESF_DECLARE;
56 : #else
57 : struct arch_esf {
58 : unsigned long ra; /* return address */
59 :
60 : unsigned long t0; /* Caller-saved temporary register */
61 : unsigned long t1; /* Caller-saved temporary register */
62 : unsigned long t2; /* Caller-saved temporary register */
63 : #if !defined(CONFIG_RISCV_ISA_RV32E)
64 : unsigned long t3; /* Caller-saved temporary register */
65 : unsigned long t4; /* Caller-saved temporary register */
66 : unsigned long t5; /* Caller-saved temporary register */
67 : unsigned long t6; /* Caller-saved temporary register */
68 : #endif /* !CONFIG_RISCV_ISA_RV32E */
69 :
70 : unsigned long a0; /* function argument/return value */
71 : unsigned long a1; /* function argument */
72 : unsigned long a2; /* function argument */
73 : unsigned long a3; /* function argument */
74 0 : unsigned long a4; /* function argument */
75 0 : unsigned long a5; /* function argument */
76 : #if !defined(CONFIG_RISCV_ISA_RV32E)
77 0 : unsigned long a6; /* function argument */
78 0 : unsigned long a7; /* function argument */
79 : #endif /* !CONFIG_RISCV_ISA_RV32E */
80 :
81 : #ifdef CONFIG_CLIC_SUPPORT_INTERRUPT_LEVEL
82 : unsigned long mcause; /* machine cause register */
83 : #endif /* CONFIG_CLIC_SUPPORT_INTERRUPT_LEVEL */
84 :
85 0 : unsigned long mepc; /* machine exception program counter */
86 0 : unsigned long mstatus; /* machine status register */
87 :
88 0 : unsigned long s0; /* callee-saved s0 */
89 :
90 : #ifdef CONFIG_USERSPACE
91 0 : unsigned long sp; /* preserved (user or kernel) stack pointer */
92 : #endif
93 :
94 : #ifdef CONFIG_EXTRA_EXCEPTION_INFO
95 : _callee_saved_t *csf; /* pointer to callee-saved-registers */
96 : #endif /* CONFIG_EXTRA_EXCEPTION_INFO */
97 :
98 : #ifdef CONFIG_RISCV_SOC_CONTEXT_SAVE
99 : struct soc_esf soc_context;
100 : #endif
101 : } __aligned(16);
102 : #endif /* CONFIG_RISCV_SOC_HAS_ISR_STACKING */
103 :
104 : #ifdef CONFIG_RISCV_SOC_CONTEXT_SAVE
105 : typedef struct soc_esf soc_esf_t;
106 : #endif
107 :
108 : #ifdef __cplusplus
109 : }
110 : #endif
111 :
112 : #endif /* _ASMLANGUAGE */
113 :
114 : #endif /* ZEPHYR_INCLUDE_ARCH_RISCV_EXCEPTION_H_ */
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