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7992d60d CM |
1 | /* |
2 | * AArch64-specific system calls implementation | |
3 | * | |
4 | * Copyright (C) 2012 ARM Ltd. | |
5 | * Author: Catalin Marinas <catalin.marinas@arm.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <linux/compiler.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/fs.h> | |
23 | #include <linux/mm.h> | |
24 | #include <linux/export.h> | |
25 | #include <linux/sched.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/syscalls.h> | |
28 | ||
29 | /* | |
30 | * Clone a task - this clones the calling program thread. | |
31 | */ | |
32 | asmlinkage long sys_clone(unsigned long clone_flags, unsigned long newsp, | |
33 | int __user *parent_tidptr, unsigned long tls_val, | |
34 | int __user *child_tidptr, struct pt_regs *regs) | |
35 | { | |
36 | if (!newsp) | |
37 | newsp = regs->sp; | |
38 | /* 16-byte aligned stack mandatory on AArch64 */ | |
39 | if (newsp & 15) | |
40 | return -EINVAL; | |
41 | return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr); | |
42 | } | |
43 | ||
44 | /* | |
45 | * sys_execve() executes a new program. | |
46 | */ | |
47 | asmlinkage long sys_execve(const char __user *filenamei, | |
48 | const char __user *const __user *argv, | |
49 | const char __user *const __user *envp, | |
50 | struct pt_regs *regs) | |
51 | { | |
52 | long error; | |
91a27b2a | 53 | struct filename *filename; |
7992d60d CM |
54 | |
55 | filename = getname(filenamei); | |
56 | error = PTR_ERR(filename); | |
57 | if (IS_ERR(filename)) | |
58 | goto out; | |
91a27b2a | 59 | error = do_execve(filename->name, argv, envp, regs); |
7992d60d CM |
60 | putname(filename); |
61 | out: | |
62 | return error; | |
63 | } | |
64 | ||
65 | int kernel_execve(const char *filename, | |
66 | const char *const argv[], | |
67 | const char *const envp[]) | |
68 | { | |
69 | struct pt_regs regs; | |
70 | int ret; | |
71 | ||
72 | memset(®s, 0, sizeof(struct pt_regs)); | |
73 | ret = do_execve(filename, | |
74 | (const char __user *const __user *)argv, | |
75 | (const char __user *const __user *)envp, ®s); | |
76 | if (ret < 0) | |
77 | goto out; | |
78 | ||
79 | /* | |
80 | * Save argc to the register structure for userspace. | |
81 | */ | |
82 | regs.regs[0] = ret; | |
83 | ||
84 | /* | |
85 | * We were successful. We won't be returning to our caller, but | |
86 | * instead to user space by manipulating the kernel stack. | |
87 | */ | |
88 | asm( "add x0, %0, %1\n\t" | |
89 | "mov x1, %2\n\t" | |
90 | "mov x2, %3\n\t" | |
91 | "bl memmove\n\t" /* copy regs to top of stack */ | |
92 | "mov x27, #0\n\t" /* not a syscall */ | |
93 | "mov x28, %0\n\t" /* thread structure */ | |
94 | "mov sp, x0\n\t" /* reposition stack pointer */ | |
95 | "b ret_to_user" | |
96 | : | |
97 | : "r" (current_thread_info()), | |
98 | "Ir" (THREAD_START_SP - sizeof(regs)), | |
99 | "r" (®s), | |
100 | "Ir" (sizeof(regs)) | |
101 | : "x0", "x1", "x2", "x27", "x28", "x30", "memory"); | |
102 | ||
103 | out: | |
104 | return ret; | |
105 | } | |
106 | EXPORT_SYMBOL(kernel_execve); | |
107 | ||
108 | asmlinkage long sys_mmap(unsigned long addr, unsigned long len, | |
109 | unsigned long prot, unsigned long flags, | |
110 | unsigned long fd, off_t off) | |
111 | { | |
112 | if (offset_in_page(off) != 0) | |
113 | return -EINVAL; | |
114 | ||
115 | return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); | |
116 | } | |
117 | ||
118 | /* | |
119 | * Wrappers to pass the pt_regs argument. | |
120 | */ | |
121 | #define sys_execve sys_execve_wrapper | |
122 | #define sys_clone sys_clone_wrapper | |
123 | #define sys_rt_sigreturn sys_rt_sigreturn_wrapper | |
124 | #define sys_sigaltstack sys_sigaltstack_wrapper | |
125 | ||
126 | #include <asm/syscalls.h> | |
127 | ||
128 | #undef __SYSCALL | |
129 | #define __SYSCALL(nr, sym) [nr] = sym, | |
130 | ||
131 | /* | |
132 | * The sys_call_table array must be 4K aligned to be accessible from | |
133 | * kernel/entry.S. | |
134 | */ | |
135 | void *sys_call_table[__NR_syscalls] __aligned(4096) = { | |
136 | [0 ... __NR_syscalls - 1] = sys_ni_syscall, | |
137 | #include <asm/unistd.h> | |
138 | }; |