Zephyr API Documentation  3.6.99
A Scalable Open Source RTOS
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syscall.h
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1/*
2 * Copyright (c) 2022 Intel Corporation.
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
16#ifndef ZEPHYR_INCLUDE_ARCH_XTENSA_SYSCALL_H_
17#define ZEPHYR_INCLUDE_ARCH_XTENSA_SYSCALL_H_
18
19#ifdef CONFIG_USERSPACE
20#ifndef _ASMLANGUAGE
21
22#include <zephyr/types.h>
23#include <stdbool.h>
24#include <zephyr/linker/sections.h>
25#include <zephyr/sys/util_macro.h>
26
27#include <xtensa/config/core-isa.h>
28
29#ifdef __cplusplus
30extern "C" {
31#endif
32
33#ifdef CONFIG_XTENSA_SYSCALL_USE_HELPER
34uintptr_t xtensa_syscall_helper(uintptr_t arg1, uintptr_t arg2,
35 uintptr_t arg3, uintptr_t arg4,
36 uintptr_t arg5, uintptr_t arg6,
37 uintptr_t call_id);
38
39#define SYSINL ALWAYS_INLINE
40#else
41#define SYSINL inline
42#endif /* CONFIG_XTENSA_SYSCALL_USE_HELPER */
43
53static SYSINL uintptr_t arch_syscall_invoke6(uintptr_t arg1, uintptr_t arg2,
54 uintptr_t arg3, uintptr_t arg4,
55 uintptr_t arg5, uintptr_t arg6,
56 uintptr_t call_id)
57{
58#ifdef CONFIG_XTENSA_SYSCALL_USE_HELPER
59 return xtensa_syscall_helper(arg1, arg2, arg3, arg4, arg5, arg6, call_id);
60#else
61 register uintptr_t a2 __asm__("%a2") = call_id;
62 register uintptr_t a6 __asm__("%a6") = arg1;
63 register uintptr_t a3 __asm__("%a3") = arg2;
64 register uintptr_t a4 __asm__("%a4") = arg3;
65 register uintptr_t a5 __asm__("%a5") = arg4;
66 register uintptr_t a8 __asm__("%a8") = arg5;
67 register uintptr_t a9 __asm__("%a9") = arg6;
68
69 __asm__ volatile("syscall\n\t"
70 : "=r" (a2)
71 : "r" (a2), "r" (a6), "r" (a3), "r" (a4),
72 "r" (a5), "r" (a8), "r" (a9)
73 : "memory");
74
75 return a2;
76#endif /* CONFIG_XTENSA_SYSCALL_USE_HELPER */
77}
78
79static SYSINL uintptr_t arch_syscall_invoke5(uintptr_t arg1, uintptr_t arg2,
80 uintptr_t arg3, uintptr_t arg4,
81 uintptr_t arg5, uintptr_t call_id)
82{
83#ifdef CONFIG_XTENSA_SYSCALL_USE_HELPER
84 return xtensa_syscall_helper(arg1, arg2, arg3, arg4, arg5, 0, call_id);
85#else
86 register uintptr_t a2 __asm__("%a2") = call_id;
87 register uintptr_t a6 __asm__("%a6") = arg1;
88 register uintptr_t a3 __asm__("%a3") = arg2;
89 register uintptr_t a4 __asm__("%a4") = arg3;
90 register uintptr_t a5 __asm__("%a5") = arg4;
91 register uintptr_t a8 __asm__("%a8") = arg5;
92
93 __asm__ volatile("syscall\n\t"
94 : "=r" (a2)
95 : "r" (a2), "r" (a6), "r" (a3), "r" (a4),
96 "r" (a5), "r" (a8)
97 : "memory");
98
99 return a2;
100#endif /* CONFIG_XTENSA_SYSCALL_USE_HELPER */
101}
102
103static SYSINL uintptr_t arch_syscall_invoke4(uintptr_t arg1, uintptr_t arg2,
104 uintptr_t arg3, uintptr_t arg4,
105 uintptr_t call_id)
106{
107#ifdef CONFIG_XTENSA_SYSCALL_USE_HELPER
108 return xtensa_syscall_helper(arg1, arg2, arg3, arg4, 0, 0, call_id);
109#else
110 register uintptr_t a2 __asm__("%a2") = call_id;
111 register uintptr_t a6 __asm__("%a6") = arg1;
112 register uintptr_t a3 __asm__("%a3") = arg2;
113 register uintptr_t a4 __asm__("%a4") = arg3;
114 register uintptr_t a5 __asm__("%a5") = arg4;
115
116 __asm__ volatile("syscall\n\t"
117 : "=r" (a2)
118 : "r" (a2), "r" (a6), "r" (a3), "r" (a4),
119 "r" (a5)
120 : "memory");
121
122 return a2;
123#endif /* CONFIG_XTENSA_SYSCALL_USE_HELPER */
124}
125
126static SYSINL uintptr_t arch_syscall_invoke3(uintptr_t arg1, uintptr_t arg2,
127 uintptr_t arg3, uintptr_t call_id)
128{
129#ifdef CONFIG_XTENSA_SYSCALL_USE_HELPER
130 return xtensa_syscall_helper(arg1, arg2, arg3, 0, 0, 0, call_id);
131#else
132 register uintptr_t a2 __asm__("%a2") = call_id;
133 register uintptr_t a6 __asm__("%a6") = arg1;
134 register uintptr_t a3 __asm__("%a3") = arg2;
135 register uintptr_t a4 __asm__("%a4") = arg3;
136
137 __asm__ volatile("syscall\n\t"
138 : "=r" (a2)
139 : "r" (a2), "r" (a6), "r" (a3), "r" (a4)
140 : "memory");
141
142 return a2;
143#endif /* CONFIG_XTENSA_SYSCALL_USE_HELPER */
144}
145
146static SYSINL uintptr_t arch_syscall_invoke2(uintptr_t arg1, uintptr_t arg2,
147 uintptr_t call_id)
148{
149#ifdef CONFIG_XTENSA_SYSCALL_USE_HELPER
150 return xtensa_syscall_helper(arg1, arg2, 0, 0, 0, 0, call_id);
151#else
152 register uintptr_t a2 __asm__("%a2") = call_id;
153 register uintptr_t a6 __asm__("%a6") = arg1;
154 register uintptr_t a3 __asm__("%a3") = arg2;
155
156 __asm__ volatile("syscall\n\t"
157 : "=r" (a2)
158 : "r" (a2), "r" (a6), "r" (a3)
159 : "memory");
160
161 return a2;
162#endif
163}
164
165static SYSINL uintptr_t arch_syscall_invoke1(uintptr_t arg1,
166 uintptr_t call_id)
167{
168#ifdef CONFIG_XTENSA_SYSCALL_USE_HELPER
169 return xtensa_syscall_helper(arg1, 0, 0, 0, 0, 0, call_id);
170#else
171 register uintptr_t a2 __asm__("%a2") = call_id;
172 register uintptr_t a6 __asm__("%a6") = arg1;
173
174 __asm__ volatile("syscall\n\t"
175 : "=r" (a2)
176 : "r" (a2), "r" (a6)
177 : "memory");
178
179 return a2;
180#endif
181}
182
183static SYSINL uintptr_t arch_syscall_invoke0(uintptr_t call_id)
184{
185#ifdef CONFIG_XTENSA_SYSCALL_USE_HELPER
186 return xtensa_syscall_helper(0, 0, 0, 0, 0, 0, call_id);
187#else
188 register uintptr_t a2 __asm__("%a2") = call_id;
189
190 __asm__ volatile("syscall\n\t"
191 : "=r" (a2)
192 : "r" (a2)
193 : "memory");
194
195 return a2;
196#endif
197}
198
199/*
200 * There is no easy (or generic) way to figure out if a thread is runnining
201 * in un-privileged mode. Reading the currrent ring (PS.CRING) is a privileged
202 * instruction and not thread local storage is not available in xcc.
203 */
204static inline bool arch_is_user_context(void)
205{
206#if XCHAL_HAVE_THREADPTR
207 uint32_t thread;
208
209 __asm__ volatile(
210 "rur.THREADPTR %0\n\t"
211 : "=a" (thread)
212 );
213#ifdef CONFIG_THREAD_LOCAL_STORAGE
214 extern __thread uint32_t is_user_mode;
215
216 if (!thread) {
217 return false;
218 }
219
220 return is_user_mode != 0;
221#else
222 return !!thread;
223#endif
224
225#else /* XCHAL_HAVE_THREADPTR */
226 extern bool xtensa_is_user_context(void);
227
228 return xtensa_is_user_context();
229#endif /* XCHAL_HAVE_THREADPTR */
230}
231
232#undef SYSINL
233
234#ifdef __cplusplus
235}
236#endif
237
238#endif /* _ASMLANGUAGE */
239#endif /* CONFIG_USERSPACE */
240#endif /* ZEPHYR_INCLUDE_ARCH_XTENSA_SYSCALL_H_ */
arch_syscall_invoke4
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
arch_syscall_invoke2
static uintptr_t arch_syscall_invoke2(uintptr_t arg1, uintptr_t arg2, uintptr_t call_id)
Definition: syscall.h:131
arch_syscall_invoke1
static uintptr_t arch_syscall_invoke1(uintptr_t arg1, uintptr_t call_id)
Definition: syscall.h:149
arch_syscall_invoke0
static uintptr_t arch_syscall_invoke0(uintptr_t call_id)
Definition: syscall.h:165
arch_is_user_context
static bool arch_is_user_context(void)
Definition: syscall.h:181
arch_syscall_invoke5
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
arch_syscall_invoke3
static uintptr_t arch_syscall_invoke3(uintptr_t arg1, uintptr_t arg2, uintptr_t arg3, uintptr_t call_id)
Definition: syscall.h:111
arch_syscall_invoke6
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
SYSINL
#define SYSINL
Definition: syscall.h:41
sections.h
Definitions of various linker Sections.
uint32_t
__UINT32_TYPE__ uint32_t
Definition: stdint.h:90
uintptr_t
__UINTPTR_TYPE__ uintptr_t
Definition: stdint.h:105
util_macro.h
Macro utilities.