xref: /openbmc/linux/arch/arm64/kernel/sys.c (revision caab277b)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * AArch64-specific system calls implementation
4  *
5  * Copyright (C) 2012 ARM Ltd.
6  * Author: Catalin Marinas <catalin.marinas@arm.com>
7  */
8 
9 #include <linux/compiler.h>
10 #include <linux/errno.h>
11 #include <linux/fs.h>
12 #include <linux/mm.h>
13 #include <linux/export.h>
14 #include <linux/sched.h>
15 #include <linux/slab.h>
16 #include <linux/syscalls.h>
17 
18 #include <asm/cpufeature.h>
19 #include <asm/syscall.h>
20 
SYSCALL_DEFINE6(mmap,unsigned long,addr,unsigned long,len,unsigned long,prot,unsigned long,flags,unsigned long,fd,unsigned long,off)21 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
22 		unsigned long, prot, unsigned long, flags,
23 		unsigned long, fd, unsigned long, off)
24 {
25 	if (offset_in_page(off) != 0)
26 		return -EINVAL;
27 
28 	return ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
29 }
30 
SYSCALL_DEFINE1(arm64_personality,unsigned int,personality)31 SYSCALL_DEFINE1(arm64_personality, unsigned int, personality)
32 {
33 	if (personality(personality) == PER_LINUX32 &&
34 		!system_supports_32bit_el0())
35 		return -EINVAL;
36 	return ksys_personality(personality);
37 }
38 
39 asmlinkage long sys_ni_syscall(void);
40 
__arm64_sys_ni_syscall(const struct pt_regs * __unused)41 asmlinkage long __arm64_sys_ni_syscall(const struct pt_regs *__unused)
42 {
43 	return sys_ni_syscall();
44 }
45 
46 /*
47  * Wrappers to pass the pt_regs argument.
48  */
49 #define __arm64_sys_personality		__arm64_sys_arm64_personality
50 
51 #undef __SYSCALL
52 #define __SYSCALL(nr, sym)	asmlinkage long __arm64_##sym(const struct pt_regs *);
53 #include <asm/unistd.h>
54 
55 #undef __SYSCALL
56 #define __SYSCALL(nr, sym)	[nr] = __arm64_##sym,
57 
58 const syscall_fn_t sys_call_table[__NR_syscalls] = {
59 	[0 ... __NR_syscalls - 1] = __arm64_sys_ni_syscall,
60 #include <asm/unistd.h>
61 };
62