1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
|
#ifndef _BITS_SYSCALLS_H
#define _BITS_SYSCALLS_H
#ifndef _SYSCALL_H
# error "Never use <bits/syscalls.h> directly; include <sys/syscall.h> instead."
#endif
/*
Some of the sneaky macros in the code were taken from
glibc-2.3.2/sysdeps/unix/sysv/linux/arm/sysdep.h
*/
#ifdef __ASSEMBLER__
/* Call a given syscall, with arguments loaded. For EABI, we must
save and restore r7 for the syscall number. Unlike the DO_CALL
macro in glibc, this macro does not load syscall arguments. */
#undef DO_CALL
#if defined(__ARM_EABI__)
#define DO_CALL(syscall_name) \
mov ip, r7; \
ldr r7, =SYS_ify (syscall_name); \
swi 0x0; \
mov r7, ip;
#else
#define DO_CALL(syscall_name) \
swi SYS_ify (syscall_name);
#endif
#else
#include <errno.h>
#define INLINE_SYSCALL_NCS(name, nr, args...) \
(__extension__ \
({ \
unsigned int _inline_sys_result = INTERNAL_SYSCALL_NCS (name, , nr, args);\
if (unlikely (INTERNAL_SYSCALL_ERROR_P (_inline_sys_result, ))) \
{ \
__set_errno (INTERNAL_SYSCALL_ERRNO (_inline_sys_result, )); \
_inline_sys_result = (unsigned int) -1; \
} \
(int) _inline_sys_result; \
}) \
)
#if !defined(__thumb__)
#if defined(__ARM_EABI__)
#define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \
(__extension__ \
({unsigned int __internal_sys_result; \
{ \
register int __a1 __asm__ ("r0"), _nr __asm__ ("r7"); \
LOAD_ARGS_##nr (args) \
_nr = (name); \
__asm__ __volatile__ ("swi 0x0 @ syscall " #name \
: "=r" (__a1) \
: "r" (_nr) ASM_ARGS_##nr \
: "memory"); \
__internal_sys_result = __a1; \
} \
(int) __internal_sys_result; }) \
)
#else /* defined(__ARM_EABI__) */
#define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \
(__extension__ \
({ unsigned int __internal_sys_result; \
{ \
register int __a1 __asm__ ("a1"); \
LOAD_ARGS_##nr (args) \
__asm__ __volatile__ ("swi %1 @ syscall " #name \
: "=r" (__a1) \
: "i" (name) ASM_ARGS_##nr \
: "memory"); \
__internal_sys_result = __a1; \
} \
(int) __internal_sys_result; }) \
)
#endif
#else /* !defined(__thumb__) */
/* We can't use push/pop inside the asm because that breaks
unwinding (ie. thread cancellation).
*/
#define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \
(__extension__ \
({ unsigned int __internal_sys_result; \
{ \
int _sys_buf[2]; \
register int __a1 __asm__ ("a1"); \
register int *_v3 __asm__ ("v3") = _sys_buf; \
*_v3 = (int) (name); \
LOAD_ARGS_##nr (args) \
__asm__ __volatile__ ("str r7, [v3, #4]\n" \
"\tldr r7, [v3]\n" \
"\tswi 0 @ syscall " #name "\n" \
"\tldr r7, [v3, #4]" \
: "=r" (__a1) \
: "r" (_v3) ASM_ARGS_##nr \
: "memory"); \
__internal_sys_result = __a1; \
} \
(int) __internal_sys_result; }) \
)
#endif /*!defined(__thumb__)*/
#define INTERNAL_SYSCALL_ERROR_P(val, err) \
((unsigned int) (val) >= 0xfffff001u)
#define LOAD_ARGS_0()
#define ASM_ARGS_0
#define LOAD_ARGS_1(a1) \
int __a1tmp = (int) (a1); \
LOAD_ARGS_0 () \
__a1 = __a1tmp;
#define ASM_ARGS_1 ASM_ARGS_0, "r" (__a1)
#define LOAD_ARGS_2(a1, a2) \
int __a2tmp = (int) (a2); \
LOAD_ARGS_1 (a1) \
register int __a2 __asm__ ("a2") = __a2tmp;
#define ASM_ARGS_2 ASM_ARGS_1, "r" (__a2)
#define LOAD_ARGS_3(a1, a2, a3) \
int __a3tmp = (int) (a3); \
LOAD_ARGS_2 (a1, a2) \
register int __a3 __asm__ ("a3") = __a3tmp;
#define ASM_ARGS_3 ASM_ARGS_2, "r" (__a3)
#define LOAD_ARGS_4(a1, a2, a3, a4) \
int __a4tmp = (int) (a4); \
LOAD_ARGS_3 (a1, a2, a3) \
register int __a4 __asm__ ("a4") = __a4tmp;
#define ASM_ARGS_4 ASM_ARGS_3, "r" (__a4)
#define LOAD_ARGS_5(a1, a2, a3, a4, a5) \
int _v1tmp = (int) (a5); \
LOAD_ARGS_4 (a1, a2, a3, a4) \
register int _v1 __asm__ ("v1") = _v1tmp;
#define ASM_ARGS_5 ASM_ARGS_4, "r" (_v1)
#define LOAD_ARGS_6(a1, a2, a3, a4, a5, a6) \
int _v2tmp = (int) (a6); \
LOAD_ARGS_5 (a1, a2, a3, a4, a5) \
register int _v2 __asm__ ("v2") = _v2tmp;
#define ASM_ARGS_6 ASM_ARGS_5, "r" (_v2)
#define LOAD_ARGS_7(a1, a2, a3, a4, a5, a6, a7) \
int _v3tmp = (int) (a7); \
LOAD_ARGS_6 (a1, a2, a3, a4, a5, a6) \
register int _v3 __asm__ ("v3") = _v3tmp;
#define ASM_ARGS_7 ASM_ARGS_6, "r" (_v3)
#endif /* __ASSEMBLER__ */
#endif /* _BITS_SYSCALLS_H */
|
