Zephyr Project API 3.7.0
A Scalable Open Source RTOS
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syscall.h
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1/*
2 * Copyright (c) 2020 BayLibre, SAS
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
16#ifndef ZEPHYR_INCLUDE_ARCH_RISCV_SYSCALL_H_
17#define ZEPHYR_INCLUDE_ARCH_RISCV_SYSCALL_H_
18
19/*
20 * Privileged mode system calls
21 */
22#define RV_ECALL_RUNTIME_EXCEPT 0
23#define RV_ECALL_IRQ_OFFLOAD 1
24#define RV_ECALL_SCHEDULE 2
25
26#ifndef _ASMLANGUAGE
27
28#include <zephyr/types.h>
29#include <stdbool.h>
30
31#ifdef __cplusplus
32extern "C" {
33#endif
34
35/*
36 * Syscall invocation macros. riscv-specific machine constraints used to ensure
37 * args land in the proper registers.
38 */
40 uintptr_t arg3, uintptr_t arg4,
41 uintptr_t arg5, uintptr_t arg6,
42 uintptr_t call_id)
43{
44 register unsigned long a0 __asm__ ("a0") = arg1;
45 register unsigned long a1 __asm__ ("a1") = arg2;
46 register unsigned long a2 __asm__ ("a2") = arg3;
47 register unsigned long a3 __asm__ ("a3") = arg4;
48 register unsigned long a4 __asm__ ("a4") = arg5;
49 register unsigned long a5 __asm__ ("a5") = arg6;
50 register unsigned long t0 __asm__ ("t0") = call_id;
51
52 __asm__ volatile ("ecall"
53 : "+r" (a0)
54 : "r" (a1), "r" (a2), "r" (a3), "r" (a4), "r" (a5),
55 "r" (t0)
56 : "memory");
57 return a0;
58}
59
61 uintptr_t arg3, uintptr_t arg4,
62 uintptr_t arg5,
63 uintptr_t call_id)
64{
65 register unsigned long a0 __asm__ ("a0") = arg1;
66 register unsigned long a1 __asm__ ("a1") = arg2;
67 register unsigned long a2 __asm__ ("a2") = arg3;
68 register unsigned long a3 __asm__ ("a3") = arg4;
69 register unsigned long a4 __asm__ ("a4") = arg5;
70 register unsigned long t0 __asm__ ("t0") = call_id;
71
72 __asm__ volatile ("ecall"
73 : "+r" (a0)
74 : "r" (a1), "r" (a2), "r" (a3), "r" (a4), "r" (t0)
75 : "memory");
76 return a0;
77}
78
80 uintptr_t arg3, uintptr_t arg4,
81 uintptr_t call_id)
82{
83 register unsigned long a0 __asm__ ("a0") = arg1;
84 register unsigned long a1 __asm__ ("a1") = arg2;
85 register unsigned long a2 __asm__ ("a2") = arg3;
86 register unsigned long a3 __asm__ ("a3") = arg4;
87 register unsigned long t0 __asm__ ("t0") = call_id;
88
89 __asm__ volatile ("ecall"
90 : "+r" (a0)
91 : "r" (a1), "r" (a2), "r" (a3), "r" (t0)
92 : "memory");
93 return a0;
94}
95
97 uintptr_t arg3,
98 uintptr_t call_id)
99{
100 register unsigned long a0 __asm__ ("a0") = arg1;
101 register unsigned long a1 __asm__ ("a1") = arg2;
102 register unsigned long a2 __asm__ ("a2") = arg3;
103 register unsigned long t0 __asm__ ("t0") = call_id;
104
105 __asm__ volatile ("ecall"
106 : "+r" (a0)
107 : "r" (a1), "r" (a2), "r" (t0)
108 : "memory");
109 return a0;
110}
111
113 uintptr_t call_id)
114{
115 register unsigned long a0 __asm__ ("a0") = arg1;
116 register unsigned long a1 __asm__ ("a1") = arg2;
117 register unsigned long t0 __asm__ ("t0") = call_id;
118
119 __asm__ volatile ("ecall"
120 : "+r" (a0)
121 : "r" (a1), "r" (t0)
122 : "memory");
123 return a0;
124}
125
127{
128 register unsigned long a0 __asm__ ("a0") = arg1;
129 register unsigned long t0 __asm__ ("t0") = call_id;
130
131 __asm__ volatile ("ecall"
132 : "+r" (a0)
133 : "r" (t0)
134 : "memory");
135 return a0;
136}
137
139{
140 register unsigned long a0 __asm__ ("a0");
141 register unsigned long t0 __asm__ ("t0") = call_id;
142
143 __asm__ volatile ("ecall"
144 : "=r" (a0)
145 : "r" (t0)
146 : "memory");
147 return a0;
148}
149
150#ifdef CONFIG_USERSPACE
151register unsigned long riscv_tp_reg __asm__ ("tp");
152
153static inline bool arch_is_user_context(void)
154{
155 /* don't try accessing TLS variables if tp is not initialized */
156 if (riscv_tp_reg == 0) {
157 return false;
158 }
159
160 /* Defined in arch/riscv/core/thread.c */
161 extern __thread uint8_t is_user_mode;
162
163 return is_user_mode != 0;
164}
165#endif
166
167#ifdef __cplusplus
168}
169#endif
170
171#endif /* _ASMLANGUAGE */
172#endif /* ZEPHYR_INCLUDE_ARCH_RISCV_SYSCALL_H_ */
static uintptr_t arch_syscall_invoke4(uintptr_t arg1, uintptr_t arg2, uintptr_t arg3, uintptr_t arg4, uintptr_t call_id)
Definition syscall.h:89
static uintptr_t arch_syscall_invoke2(uintptr_t arg1, uintptr_t arg2, uintptr_t call_id)
Definition syscall.h:131
static uintptr_t arch_syscall_invoke1(uintptr_t arg1, uintptr_t call_id)
Definition syscall.h:149
static uintptr_t arch_syscall_invoke0(uintptr_t call_id)
Definition syscall.h:165
static bool arch_is_user_context(void)
Definition syscall.h:181
static uintptr_t arch_syscall_invoke5(uintptr_t arg1, uintptr_t arg2, uintptr_t arg3, uintptr_t arg4, uintptr_t arg5, uintptr_t call_id)
Definition syscall.h:65
static uintptr_t arch_syscall_invoke3(uintptr_t arg1, uintptr_t arg2, uintptr_t arg3, uintptr_t call_id)
Definition syscall.h:111
static uintptr_t arch_syscall_invoke6(uintptr_t arg1, uintptr_t arg2, uintptr_t arg3, uintptr_t arg4, uintptr_t arg5, uintptr_t arg6, uintptr_t call_id)
Definition syscall.h:40
__UINT8_TYPE__ uint8_t
Definition stdint.h:88
__UINTPTR_TYPE__ uintptr_t
Definition stdint.h:105