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