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 */
__sys_clone(unsigned long clone_flags,unsigned long newsp,void __user * parent_tid,void __user * child_tid,struct pt_regs * regs)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 */
__sys_execve(const char __user * filename,const char __user * const __user * argv,const char __user * const __user * envp,struct pt_regs * regs)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;
54 char *fn;
55
56 fn = getname(filename);
57 error = PTR_ERR(fn);
58 if (IS_ERR(fn))
59 goto out;
60 error = do_execve(fn, argv, envp, regs);
61 putname(fn);
62 out:
63 return error;
64 }
65
kernel_execve(const char * filename,const char * const argv[],const char * const envp[])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 }
107 EXPORT_SYMBOL(kernel_execve);
108
109 /* Note: used by the compat code even in 64-bit Linux. */
SYSCALL_DEFINE6(mmap2,unsigned long,addr,unsigned long,len,unsigned long,prot,unsigned long,flags,unsigned long,fd,unsigned long,off_4k)110 SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
111 unsigned long, prot, unsigned long, flags,
112 unsigned long, fd, unsigned long, off_4k)
113 {
114 return sys_mmap_pgoff(addr, len, prot, flags, fd,
115 off_4k);
116 }
117
118 /* Provide the actual syscall number to call mapping. */
119 #undef __SYSCALL
120 #define __SYSCALL(nr, call) [nr] = (call),
121
122 /* Note that we don't include <linux/unistd.h> but <asm/unistd.h> */
123 void *sys_call_table[__NR_syscalls] = {
124 [0 ... __NR_syscalls-1] = sys_ni_syscall,
125 #include <asm/unistd.h>
126 };
127