64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
|
// SPDX-License-Identifier: GPL-2.0+
|
||
|
|
/*
|
||
|
|
* Author: Hanlu Li <lihanlu@loongson.cn>
|
||
|
|
* Huacai Chen <chenhuacai@loongson.cn>
|
||
|
|
*
|
||
|
|
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
|
||
|
|
*/
|
||
|
|
#include <linux/capability.h>
|
||
|
|
#include <linux/entry-common.h>
|
||
|
|
#include <linux/errno.h>
|
||
|
|
#include <linux/linkage.h>
|
||
|
|
#include <linux/syscalls.h>
|
||
|
|
#include <linux/unistd.h>
|
||
|
|
|
||
|
|
#include <asm/asm.h>
|
||
|
|
#include <asm/signal.h>
|
||
|
|
#include <asm/switch_to.h>
|
||
|
|
#include <asm-generic/syscalls.h>
|
||
|
|
|
||
|
|
#undef __SYSCALL
|
||
|
|
#define __SYSCALL(nr, call) [nr] = (call),
|
||
|
|
|
||
|
|
SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len, unsigned long,
|
||
|
|
prot, unsigned long, flags, unsigned long, fd, off_t, offset)
|
||
|
|
{
|
||
|
|
if (offset & ~PAGE_MASK)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
return ksys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
|
||
|
|
}
|
||
|
|
|
||
|
|
void *sys_call_table[__NR_syscalls] = {
|
||
|
|
[0 ... __NR_syscalls - 1] = sys_ni_syscall,
|
||
|
|
#include <asm/unistd.h>
|
||
|
|
};
|
||
|
|
|
||
|
|
typedef long (*sys_call_fn)(unsigned long, unsigned long,
|
||
|
|
unsigned long, unsigned long, unsigned long, unsigned long);
|
||
|
|
|
||
|
|
void noinstr do_syscall(struct pt_regs *regs)
|
||
|
|
{
|
||
|
|
unsigned long nr;
|
||
|
|
sys_call_fn syscall_fn;
|
||
|
|
|
||
|
|
nr = regs->regs[11];
|
||
|
|
/* Set for syscall restarting */
|
||
|
|
if (nr < NR_syscalls)
|
||
|
|
regs->regs[0] = nr + 1;
|
||
|
|
|
||
|
|
regs->csr_era += 4;
|
||
|
|
regs->orig_a0 = regs->regs[4];
|
||
|
|
regs->regs[4] = -ENOSYS;
|
||
|
|
|
||
|
|
nr = syscall_enter_from_user_mode(regs, nr);
|
||
|
|
|
||
|
|
if (nr < NR_syscalls) {
|
||
|
|
syscall_fn = sys_call_table[nr];
|
||
|
|
regs->regs[4] = syscall_fn(regs->orig_a0, regs->regs[5], regs->regs[6],
|
||
|
|
regs->regs[7], regs->regs[8], regs->regs[9]);
|
||
|
|
}
|
||
|
|
|
||
|
|
syscall_exit_to_user_mode(regs);
|
||
|
|
}
|