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36028d5dd7
Using the ksys_p{read,write}64() wrappers allows us to get rid of
in-kernel calls to the sys_pread64() and sys_pwrite64() syscalls.
The ksys_ prefix denotes that this function is meant as a drop-in
replacement for the syscall. In particular, it uses the same calling
convention as sys_p{read,write}64().
This patch is part of a series which removes in-kernel calls to syscalls.
On this basis, the syscall entry path can be streamlined. For details, see
http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/sched/task_stack.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/sem.h>
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#include <linux/msg.h>
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#include <linux/shm.h>
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#include <linux/stat.h>
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#include <linux/syscalls.h>
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#include <linux/mman.h>
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#include <linux/file.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/ipc.h>
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#include <asm/cacheflush.h>
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#include <linux/uaccess.h>
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#include <asm/unistd.h>
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#include <asm/syscalls.h>
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/*
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* sys_pipe() is the normal C calling standard for creating
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* a pipe. It's not the way Unix traditionally does this, though.
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*/
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asmlinkage int sys_sh_pipe(void)
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{
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int fd[2];
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int error;
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error = do_pipe_flags(fd, 0);
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if (!error) {
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current_pt_regs()->regs[1] = fd[1];
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return fd[0];
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}
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return error;
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}
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asmlinkage ssize_t sys_pread_wrapper(unsigned int fd, char __user *buf,
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size_t count, long dummy, loff_t pos)
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{
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return ksys_pread64(fd, buf, count, pos);
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}
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asmlinkage ssize_t sys_pwrite_wrapper(unsigned int fd, const char __user *buf,
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size_t count, long dummy, loff_t pos)
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{
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return ksys_pwrite64(fd, buf, count, pos);
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}
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asmlinkage int sys_fadvise64_64_wrapper(int fd, u32 offset0, u32 offset1,
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u32 len0, u32 len1, int advice)
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{
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#ifdef __LITTLE_ENDIAN__
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return sys_fadvise64_64(fd, (u64)offset1 << 32 | offset0,
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(u64)len1 << 32 | len0, advice);
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#else
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return sys_fadvise64_64(fd, (u64)offset0 << 32 | offset1,
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(u64)len0 << 32 | len1, advice);
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#endif
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}
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