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79725df5 G |
1 | /* |
2 | * linux/arch/unicore32/kernel/sys.c | |
3 | * | |
4 | * Code specific to PKUnity SoC and UniCore ISA | |
5 | * | |
6 | * Copyright (C) 2001-2010 GUAN Xue-tao | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | #include <linux/module.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/mm.h> | |
17 | #include <linux/sem.h> | |
18 | #include <linux/msg.h> | |
19 | #include <linux/shm.h> | |
20 | #include <linux/stat.h> | |
21 | #include <linux/syscalls.h> | |
22 | #include <linux/mman.h> | |
23 | #include <linux/fs.h> | |
24 | #include <linux/file.h> | |
25 | #include <linux/ipc.h> | |
26 | #include <linux/uaccess.h> | |
27 | ||
28 | #include <asm/syscalls.h> | |
29 | #include <asm/cacheflush.h> | |
30 | ||
31 | /* Clone a task - this clones the calling program thread. | |
32 | * This is called indirectly via a small wrapper | |
33 | */ | |
34 | asmlinkage long __sys_clone(unsigned long clone_flags, unsigned long newsp, | |
35 | void __user *parent_tid, void __user *child_tid, | |
36 | struct pt_regs *regs) | |
37 | { | |
38 | if (!newsp) | |
39 | newsp = regs->UCreg_sp; | |
40 | ||
41 | return do_fork(clone_flags, newsp, regs, 0, | |
42 | parent_tid, child_tid); | |
43 | } | |
44 | ||
45 | /* sys_execve() executes a new program. | |
46 | * This is called indirectly via a small wrapper | |
47 | */ | |
48 | asmlinkage long __sys_execve(const char __user *filename, | |
49 | const char __user *const __user *argv, | |
50 | const char __user *const __user *envp, | |
51 | struct pt_regs *regs) | |
52 | { | |
53 | int error; | |
91a27b2a | 54 | struct filename *fn; |
79725df5 G |
55 | |
56 | fn = getname(filename); | |
57 | error = PTR_ERR(fn); | |
58 | if (IS_ERR(fn)) | |
59 | goto out; | |
91a27b2a | 60 | error = do_execve(fn->name, argv, envp, regs); |
79725df5 G |
61 | putname(fn); |
62 | out: | |
63 | return error; | |
64 | } | |
65 | ||
66 | int kernel_execve(const char *filename, | |
67 | const char *const argv[], | |
68 | const char *const envp[]) | |
69 | { | |
70 | struct pt_regs regs; | |
71 | int ret; | |
72 | ||
73 | memset(®s, 0, sizeof(struct pt_regs)); | |
74 | ret = do_execve(filename, | |
75 | (const char __user *const __user *)argv, | |
76 | (const char __user *const __user *)envp, ®s); | |
77 | if (ret < 0) | |
78 | goto out; | |
79 | ||
80 | /* | |
81 | * Save argc to the register structure for userspace. | |
82 | */ | |
83 | regs.UCreg_00 = ret; | |
84 | ||
85 | /* | |
86 | * We were successful. We won't be returning to our caller, but | |
87 | * instead to user space by manipulating the kernel stack. | |
88 | */ | |
89 | asm("add r0, %0, %1\n\t" | |
90 | "mov r1, %2\n\t" | |
91 | "mov r2, %3\n\t" | |
92 | "mov r22, #0\n\t" /* not a syscall */ | |
93 | "mov r23, %0\n\t" /* thread structure */ | |
94 | "b.l memmove\n\t" /* copy regs to top of stack */ | |
95 | "mov sp, r0\n\t" /* reposition stack pointer */ | |
96 | "b ret_to_user" | |
97 | : | |
98 | : "r" (current_thread_info()), | |
99 | "Ir" (THREAD_START_SP - sizeof(regs)), | |
100 | "r" (®s), | |
101 | "Ir" (sizeof(regs)) | |
102 | : "r0", "r1", "r2", "r3", "ip", "lr", "memory"); | |
103 | ||
104 | out: | |
105 | return ret; | |
106 | } | |
79725df5 G |
107 | |
108 | /* Note: used by the compat code even in 64-bit Linux. */ | |
109 | SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len, | |
110 | unsigned long, prot, unsigned long, flags, | |
111 | unsigned long, fd, unsigned long, off_4k) | |
112 | { | |
113 | return sys_mmap_pgoff(addr, len, prot, flags, fd, | |
114 | off_4k); | |
115 | } | |
116 | ||
117 | /* Provide the actual syscall number to call mapping. */ | |
118 | #undef __SYSCALL | |
119 | #define __SYSCALL(nr, call) [nr] = (call), | |
120 | ||
121 | /* Note that we don't include <linux/unistd.h> but <asm/unistd.h> */ | |
122 | void *sys_call_table[__NR_syscalls] = { | |
123 | [0 ... __NR_syscalls-1] = sys_ni_syscall, | |
124 | #include <asm/unistd.h> | |
125 | }; |