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b9398a84 RK |
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 | ||
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; | |
91a27b2a | 43 | struct filename *filename; |
b9398a84 RK |
44 | int retval; |
45 | ||
46 | filename = getname(ufilename); | |
47 | retval = PTR_ERR(filename); | |
48 | if (IS_ERR(filename)) | |
49 | return retval; | |
50 | ||
91a27b2a | 51 | retval = do_execve(filename->name, argv, envp, pregs); |
b9398a84 RK |
52 | putname(filename); |
53 | ||
54 | return retval; | |
55 | } | |
56 | ||
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 | */ | |
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 | } |