1 /*
2 * Hexagon system calls
3 *
4 * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 and
8 * only version 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA.
19 */
20
21 #include <linux/file.h>
22 #include <linux/fs.h>
23 #include <linux/linkage.h>
24 #include <linux/mm.h>
25 #include <linux/module.h>
26 #include <linux/sched.h>
27 #include <linux/slab.h>
28 #include <linux/syscalls.h>
29 #include <linux/unistd.h>
30 #include <asm/mman.h>
31 #include <asm/registers.h>
32
33 /*
34 * System calls with architecture-specific wrappers.
35 * See signal.c for signal-related system call wrappers.
36 */
37
sys_execve(char __user * ufilename,const char __user * const __user * argv,const char __user * const __user * envp)38 asmlinkage int sys_execve(char __user *ufilename,
39 const char __user *const __user *argv,
40 const char __user *const __user *envp)
41 {
42 struct pt_regs *pregs = current_thread_info()->regs;
43 char *filename;
44 int retval;
45
46 filename = getname(ufilename);
47 retval = PTR_ERR(filename);
48 if (IS_ERR(filename))
49 return retval;
50
51 retval = do_execve(filename, argv, envp, pregs);
52 putname(filename);
53
54 return retval;
55 }
56
sys_clone(unsigned long clone_flags,unsigned long newsp,unsigned long parent_tidp,unsigned long child_tidp)57 asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
58 unsigned long parent_tidp, unsigned long child_tidp)
59 {
60 struct pt_regs *pregs = current_thread_info()->regs;
61
62 if (!newsp)
63 newsp = pregs->SP;
64 return do_fork(clone_flags, newsp, pregs, 0, (int __user *)parent_tidp,
65 (int __user *)child_tidp);
66 }
67
68 /*
69 * Do a system call from the kernel, so as to have a proper pt_regs
70 * and recycle the sys_execvpe infrustructure.
71 */
kernel_execve(const char * filename,const char * const argv[],const char * const envp[])72 int kernel_execve(const char *filename,
73 const char *const argv[], const char *const envp[])
74 {
75 register unsigned long __a0 asm("r0") = (unsigned long) filename;
76 register unsigned long __a1 asm("r1") = (unsigned long) argv;
77 register unsigned long __a2 asm("r2") = (unsigned long) envp;
78 int retval;
79
80 __asm__ volatile(
81 " R6 = #%4;\n"
82 " trap0(#1);\n"
83 " %0 = R0;\n"
84 : "=r" (retval)
85 : "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve)
86 );
87
88 return retval;
89 }
90 EXPORT_SYMBOL(kernel_execve);
91