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/* Assembly macros for RISC-V.
Copyright (C) 2011-2018
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<http://www.gnu.org/licenses/>. */
#ifndef _LINUX_RISCV_SYSDEP_H
#define _LINUX_RISCV_SYSDEP_H 1
#include <common/sysdep.h>
#include <sys/syscall.h>
#ifdef __ASSEMBLER__
# include <sys/asm.h>
# define ENTRY(name) LEAF(name)
# define L(label) .L ## label
/* Performs a system call, handling errors by setting errno. Linux indicates
errors by setting a0 to a value between -1 and -4095. */
# undef PSEUDO
# define PSEUDO(name, syscall_name, args) \
.text; \
.align 2; \
ENTRY (name); \
li a7, SYS_ify (syscall_name); \
scall; \
li a7, -4096; \
bgtu a0, a7, .Lsyscall_error ## name;
# undef PSEUDO_END
# define PSEUDO_END(sym) \
SYSCALL_ERROR_HANDLER (sym) \
ret; \
END (sym)
# if !IS_IN_libc
# if defined (__PIC__)
# define SYSCALL_ERROR_HANDLER(name) \
.Lsyscall_error ## name: \
la.tls.ie t1, errno; \
add t1, t1, tp; \
neg a0, a0; \
sw a0, 0(t1); \
li a0, -1;
# else
# define SYSCALL_ERROR_HANDLER(name) \
.Lsyscall_error ## name: \
lui t1, %tprel_hi(errno); \
add t1, t1, tp, %tprel_add(errno); \
neg a0, a0; \
sw a0, %tprel_lo(errno)(t1); \
li a0, -1;
# endif
# else
# define SYSCALL_ERROR_HANDLER(name) \
.Lsyscall_error ## name: \
j __syscall_error;
# endif
/* Performs a system call, not setting errno. */
# undef PSEUDO_NEORRNO
# define PSEUDO_NOERRNO(name, syscall_name, args) \
.align 2; \
ENTRY (name); \
li a7, SYS_ify (syscall_name); \
scall;
# undef PSEUDO_END_NOERRNO
# define PSEUDO_END_NOERRNO(name) \
END (name)
# undef ret_NOERRNO
# define ret_NOERRNO ret
/* Perfroms a system call, returning the error code. */
# undef PSEUDO_ERRVAL
# define PSEUDO_ERRVAL(name, syscall_name, args) \
PSEUDO_NOERRNO (name, syscall_name, args) \
neg a0, a0;
# undef PSEUDO_END_ERRVAL
# define PSEUDO_END_ERRVAL(name) \
END (name)
# undef ret_ERRVAL
# define ret_ERRVAL ret
#endif /* __ASSEMBLER__ */
/* In order to get __set_errno() definition in INLINE_SYSCALL. */
#ifndef __ASSEMBLER__
# include <errno.h>
#endif
#undef SYS_ify
#define SYS_ify(syscall_name) __NR_##syscall_name
#ifndef __ASSEMBLER__
/* List of system calls which are supported as vsyscalls. */
# define HAVE_CLOCK_GETRES_VSYSCALL 1
# define HAVE_CLOCK_GETTIME_VSYSCALL 1
# define HAVE_GETTIMEOFDAY_VSYSCALL 1
# define HAVE_GETCPU_VSYSCALL 1
extern long int __syscall_error (long int neg_errno);
#endif /* ! __ASSEMBLER__ */
#endif /* linux/riscv/sysdep.h */
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