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#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
*/
#define SYS_ify(syscall_name) (__NR_##syscall_name)
#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>
#undef _syscall0
#define _syscall0(type,name) \
type name(void) \
{ \
return (type) (INLINE_SYSCALL(name, 0)); \
}
#undef _syscall1
#define _syscall1(type,name,type1,arg1) \
type name(type1 arg1) \
{ \
return (type) (INLINE_SYSCALL(name, 1, arg1)); \
}
#undef _syscall2
#define _syscall2(type,name,type1,arg1,type2,arg2) \
type name(type1 arg1,type2 arg2) \
{ \
return (type) (INLINE_SYSCALL(name, 2, arg1, arg2)); \
}
#undef _syscall3
#define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3) \
type name(type1 arg1,type2 arg2,type3 arg3) \
{ \
return (type) (INLINE_SYSCALL(name, 3, arg1, arg2, arg3)); \
}
#undef _syscall4
#define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4) \
type name (type1 arg1, type2 arg2, type3 arg3, type4 arg4) \
{ \
return (type) (INLINE_SYSCALL(name, 4, arg1, arg2, arg3, arg4)); \
}
#undef _syscall5
#define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \
type5,arg5) \
type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5) \
{ \
return (type) (INLINE_SYSCALL(name, 5, arg1, arg2, arg3, arg4, arg5)); \
}
#undef _syscall6
#define _syscall6(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \
type5,arg5,type6,arg6) \
type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5, type6 arg6) \
{ \
return (type) (INLINE_SYSCALL(name, 6, arg1, arg2, arg3, arg4, arg5, arg6)); \
}
#undef _syscall7
#define _syscall7(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \
type5,arg5,type6,arg6,type7,arg7) \
type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5, type6 arg6,type7 arg7) \
{ \
return (type) (INLINE_SYSCALL(name, 7, arg1, arg2, arg3, arg4, arg5, arg6, arg7)); \
}
#undef INLINE_SYSCALL
#define INLINE_SYSCALL(name, nr, args...) \
({ unsigned int __sys_result = INTERNAL_SYSCALL (name, , nr, args); \
if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (__sys_result, ), 0)) \
{ \
__set_errno (INTERNAL_SYSCALL_ERRNO (__sys_result, )); \
__sys_result = (unsigned int) -1; \
} \
(int) __sys_result; })
#undef INTERNAL_SYSCALL_DECL
#define INTERNAL_SYSCALL_DECL(err) do { } while (0)
#undef INTERNAL_SYSCALL
#if defined(__ARM_EABI__)
#if !defined(__thumb__)
#define INTERNAL_SYSCALL(name, err, nr, args...) \
({unsigned int _sys_result; \
{ \
register int _a1 __asm__ ("r0"), _nr __asm__ ("r7"); \
LOAD_ARGS_##nr (args) \
_nr = SYS_ify(name); \
__asm__ volatile ("swi 0x0 @ syscall " #name \
: "=r" (_a1) \
: "r" (_nr) ASM_ARGS_##nr \
: "memory"); \
_sys_result = _a1; \
} \
(int) _sys_result; })
#else /* !defined(__thumb__) */
/* So hide the use of r7 from the compiler, this would be a lot
* easier but for the fact that the syscalls can exceed 255.
* For the moment the LOAD_ARG_7 is sacrificed.
*/
#define INTERNAL_SYSCALL(name, err, nr, args...) \
({ unsigned int _sys_result; \
{ \
register int _a1 asm ("a1"); \
LOAD_ARGS_##nr (args) \
register int _v3 asm ("v3") = (int) (SYS_ify(name)); \
asm volatile ("push {r7}\n" \
"\tmov r7, v3\n" \
"\tswi 0 @ syscall " #name "\n" \
"\tpop {r7}" \
: "=r" (_a1) \
: "r" (_v3) ASM_ARGS_##nr \
: "memory"); \
_sys_result = _a1; \
} \
(int) _sys_result; })
#endif /*!defined(__thumb__)*/
#else /* !defined(__ARM_EABI__) */
#if !defined(__thumb__)
#define INTERNAL_SYSCALL(name, err, nr, args...) \
({ unsigned int _sys_result; \
{ \
register int _a1 __asm__ ("a1"); \
LOAD_ARGS_##nr (args) \
__asm__ volatile ("swi %1 @ syscall " #name \
: "=r" (_a1) \
: "i" (SYS_ify(name)) ASM_ARGS_##nr \
: "memory"); \
_sys_result = _a1; \
} \
(int) _sys_result; })
#else
#if 0
/* This doesn't work because GCC uses r7 as a frame pointer in
* some cases and doesn't notice that the _r7 value changes
* it, resulting in mysterious crashes after the SWI.
*/
#define INTERNAL_SYSCALL(name, err, nr, args...) \
({ unsigned int _sys_result; \
{ \
register int _a1 __asm__ ("a1"); \
LOAD_ARGS_##nr (args) \
register int _r7 __asm__ ("r7") = (int) (SYS_ify(name)); \
__asm__ volatile ("swi 0 @ syscall " #name \
: "=r" (_a1) \
: "r" (_r7) ASM_ARGS_##nr \
: "memory"); \
_sys_result = _a1; \
} \
(int) _sys_result; })
#else
/* So hide the use of r7 from the compiler, this would be a lot
* easier but for the fact that the syscalls can exceed 255.
* For the moment the LOAD_ARG_7 is sacrificed.
*/
#define INTERNAL_SYSCALL(name, err, nr, args...) \
({ unsigned int _sys_result; \
{ \
register int _a1 __asm__ ("a1"); \
LOAD_ARGS_##nr (args) \
register int _v3 __asm__ ("v3") = (int) (SYS_ify(name)); \
__asm__ volatile ("push {r7}\n" \
"\tmov r7, v3\n" \
"\tswi 0 @ syscall " #name "\n" \
"\tpop {r7}" \
: "=r" (_a1) \
: "r" (_v3) ASM_ARGS_##nr \
: "memory"); \
_sys_result = _a1; \
} \
(int) _sys_result; })
#endif
#endif
#endif /* !defined(__ARM_EABI__) */
#undef INTERNAL_SYSCALL_ERROR_P
#define INTERNAL_SYSCALL_ERROR_P(val, err) \
((unsigned int) (val) >= 0xfffff001u)
#undef INTERNAL_SYSCALL_ERRNO
#define INTERNAL_SYSCALL_ERRNO(val, err) (-(val))
#define LOAD_ARGS_0()
#define ASM_ARGS_0
#define LOAD_ARGS_1(a1) \
_a1 = (int) (a1); \
LOAD_ARGS_0 ()
#define ASM_ARGS_1 ASM_ARGS_0, "r" (_a1)
#define LOAD_ARGS_2(a1, a2) \
register int _a2 __asm__ ("a2") = (int) (a2); \
LOAD_ARGS_1 (a1)
#define ASM_ARGS_2 ASM_ARGS_1, "r" (_a2)
#define LOAD_ARGS_3(a1, a2, a3) \
register int _a3 __asm__ ("a3") = (int) (a3); \
LOAD_ARGS_2 (a1, a2)
#define ASM_ARGS_3 ASM_ARGS_2, "r" (_a3)
#define LOAD_ARGS_4(a1, a2, a3, a4) \
register int _a4 __asm__ ("a4") = (int) (a4); \
LOAD_ARGS_3 (a1, a2, a3)
#define ASM_ARGS_4 ASM_ARGS_3, "r" (_a4)
#define LOAD_ARGS_5(a1, a2, a3, a4, a5) \
register int _v1 __asm__ ("v1") = (int) (a5); \
LOAD_ARGS_4 (a1, a2, a3, a4)
#define ASM_ARGS_5 ASM_ARGS_4, "r" (_v1)
#define LOAD_ARGS_6(a1, a2, a3, a4, a5, a6) \
register int _v2 __asm__ ("v2") = (int) (a6); \
LOAD_ARGS_5 (a1, a2, a3, a4, a5)
#define ASM_ARGS_6 ASM_ARGS_5, "r" (_v2)
#define LOAD_ARGS_7(a1, a2, a3, a4, a5, a6, a7) \
register int _v3 __asm__ ("v3") = (int) (a7); \
LOAD_ARGS_6 (a1, a2, a3, a4, a5, a6)
#define ASM_ARGS_7 ASM_ARGS_6, "r" (_v3)
#endif /* __ASSEMBLER__ */
#endif /* _BITS_SYSCALLS_H */
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