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/*
* Copyright (C) 2016 Andes Technology, Inc.
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*/
#ifndef _BITS_SYSCALLS_H
#define _BITS_SYSCALLS_H
#ifndef _SYSCALL_H
# error "Never use <bits/syscalls.h> directly; include <sys/syscall.h> instead."
#endif
#ifndef __ASSEMBLER__
#include <errno.h>
#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 X(x) #x
#define Y(x) X(x)
#define __issue_syscall(syscall_name) \
" syscall " Y(syscall_name) "; \n"
#define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \
(__extension__ \
({ \
register long __result __asm__("$r0"); \
register long _sys_num __asm__("$r8"); \
\
LOAD_ARGS_##nr (name, args) \
_sys_num = (name); \
\
__asm__ volatile ( \
__issue_syscall (name) \
: "=r" (__result) \
: "r"(_sys_num) ASM_ARGS_##nr \
: "$lp", "memory"); \
__result; \
}) \
)
/* Macros for setting up inline __asm__ input regs */
#define ASM_ARGS_0
#define ASM_ARGS_1 ASM_ARGS_0, "r" (__result)
#define ASM_ARGS_2 ASM_ARGS_1, "r" (_arg2)
#define ASM_ARGS_3 ASM_ARGS_2, "r" (_arg3)
#define ASM_ARGS_4 ASM_ARGS_3, "r" (_arg4)
#define ASM_ARGS_5 ASM_ARGS_4, "r" (_arg5)
#define ASM_ARGS_6 ASM_ARGS_5, "r" (_arg6)
#define ASM_ARGS_7 ASM_ARGS_6, "r" (_arg7)
/* Macros for converting sys-call wrapper args into sys call args */
#define LOAD_ARGS_0(name, arg) \
_sys_num = (long) (name); \
#define LOAD_ARGS_1(name, arg1) \
__result = (long) (arg1); \
LOAD_ARGS_0 (name, arg1)
/*
* Note that the use of _tmpX might look superflous, however it is needed
* to ensure that register variables are not clobbered if arg happens to be
* a function call itself. e.g. sched_setaffinity() calling getpid() for arg2
*
* Also this specific order of recursive calling is important to segregate
* the tmp args evaluation (function call case described above) and assigment
* of register variables
*/
#define LOAD_ARGS_2(name, arg1, arg2) \
long _tmp2 = (long) (arg2); \
LOAD_ARGS_1 (name, arg1) \
register long _arg2 __asm__ ("$r1") = _tmp2;
#define LOAD_ARGS_3(name, arg1, arg2, arg3) \
long _tmp3 = (long) (arg3); \
LOAD_ARGS_2 (name, arg1, arg2) \
register long _arg3 __asm__ ("$r2") = _tmp3;
#define LOAD_ARGS_4(name, arg1, arg2, arg3, arg4) \
long _tmp4 = (long) (arg4); \
LOAD_ARGS_3 (name, arg1, arg2, arg3) \
register long _arg4 __asm__ ("$r3") = _tmp4;
#define LOAD_ARGS_5(name, arg1, arg2, arg3, arg4, arg5) \
long _tmp5 = (long) (arg5); \
LOAD_ARGS_4 (name, arg1, arg2, arg3, arg4) \
register long _arg5 __asm__ ("$r4") = _tmp5;
#define LOAD_ARGS_6(name, arg1, arg2, arg3, arg4, arg5, arg6) \
long _tmp6 = (long) (arg6); \
LOAD_ARGS_5 (name, arg1, arg2, arg3, arg4, arg5) \
register long _arg6 __asm__ ("$r5") = _tmp6;
#define LOAD_ARGS_7(name, arg1, arg2, arg3, arg4, arg5, arg6, arg7)\
long _tmp7 = (long) (arg7); \
LOAD_ARGS_6 (name, arg1, arg2, arg3, arg4, arg5, arg6) \
register long _arg7 __asm__ ("$r6") = _tmp7;
#endif /* ! __ASSEMBLER__ */
#endif /* _BITS_SYSCALLS_H */
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