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) 2018 Linaro Limited.
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
16#ifndef ZEPHYR_INCLUDE_ARCH_X86_IA32_SYSCALL_H_
17#define ZEPHYR_INCLUDE_ARCH_X86_IA32_SYSCALL_H_
18
19#define USER_CODE_SEG 0x2b /* at dpl=3 */
20#define USER_DATA_SEG 0x33 /* at dpl=3 */
21
22#ifdef CONFIG_USERSPACE
23#ifndef _ASMLANGUAGE
24
25#include <zephyr/types.h>
26#include <stdbool.h>
28
29#ifdef __cplusplus
30extern "C" {
31#endif
32
33/* Syscall invocation macros. x86-specific machine constraints used to ensure
34 * args land in the proper registers, see implementation of
35 * z_x86_syscall_entry_stub in userspace.S
36 */
37
38__pinned_func
40 uintptr_t arg3, uintptr_t arg4,
41 uintptr_t arg5, uintptr_t arg6,
42 uintptr_t call_id)
43{
44 uint32_t ret;
45
46 __asm__ volatile("push %%ebp\n\t"
47 "mov %[arg6], %%ebp\n\t"
48 "int $0x80\n\t"
49 "pop %%ebp\n\t"
50 : "=a" (ret)
51 : "S" (call_id), "a" (arg1), "d" (arg2),
52 "c" (arg3), "b" (arg4), "D" (arg5),
53 [arg6] "m" (arg6)
54 : "memory");
55 return ret;
56}
57
58__pinned_func
60 uintptr_t arg3, uintptr_t arg4,
61 uintptr_t arg5,
62 uintptr_t call_id)
63{
64 uint32_t ret;
65
66 __asm__ volatile("int $0x80"
67 : "=a" (ret)
68 : "S" (call_id), "a" (arg1), "d" (arg2),
69 "c" (arg3), "b" (arg4), "D" (arg5)
70 : "memory");
71 return ret;
72}
73
74__pinned_func
76 uintptr_t arg3, uintptr_t arg4,
77 uintptr_t call_id)
78{
79 uint32_t ret;
80
81 __asm__ volatile("int $0x80"
82 : "=a" (ret)
83 : "S" (call_id), "a" (arg1), "d" (arg2), "c" (arg3),
84 "b" (arg4)
85 : "memory");
86 return ret;
87}
88
89__pinned_func
91 uintptr_t arg3,
92 uintptr_t call_id)
93{
94 uint32_t ret;
95
96 __asm__ volatile("int $0x80"
97 : "=a" (ret)
98 : "S" (call_id), "a" (arg1), "d" (arg2), "c" (arg3)
99 : "memory");
100 return ret;
101}
102
103__pinned_func
105 uintptr_t call_id)
106{
107 uint32_t ret;
108
109 __asm__ volatile("int $0x80"
110 : "=a" (ret)
111 : "S" (call_id), "a" (arg1), "d" (arg2)
112 : "memory"
113 );
114 return ret;
115}
116
117__pinned_func
119 uintptr_t call_id)
120{
121 uint32_t ret;
122
123 __asm__ volatile("int $0x80"
124 : "=a" (ret)
125 : "S" (call_id), "a" (arg1)
126 : "memory"
127 );
128 return ret;
129}
130
131__pinned_func
133{
134 uint32_t ret;
135
136 __asm__ volatile("int $0x80"
137 : "=a" (ret)
138 : "S" (call_id)
139 : "memory"
140 );
141 return ret;
142}
143
144__pinned_func
145static inline bool arch_is_user_context(void)
146{
147 int cs;
148
149 /* On x86, read the CS register (which cannot be manually set) */
150 __asm__ volatile ("mov %%cs, %[cs_val]" : [cs_val] "=r" (cs));
151
152 return cs == USER_CODE_SEG;
153}
154
155
156#ifdef __cplusplus
157}
158#endif
159
160#endif /* _ASMLANGUAGE */
161#endif /* CONFIG_USERSPACE */
162#endif /* ZEPHYR_INCLUDE_ARCH_X86_IA32_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
#define USER_CODE_SEG
Definition: syscall.h:19
Definitions of various linker Sections.
__UINT32_TYPE__ uint32_t
Definition: stdint.h:90
__UINTPTR_TYPE__ uintptr_t
Definition: stdint.h:105