1 /*
2  * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
3  * Copyright (C) 2007-2009 PetaLogix
4  * Copyright (C) 2007 John Williams <john.williams@petalogix.com>
5  *
6  * Copyright (C) 2006 Atmark Techno, Inc.
7  *	Yasushi SHOJI <yashi@atmark-techno.com>
8  *	Tetsuya OHKAWA <tetsuya@atmark-techno.com>
9  *
10  * This file is subject to the terms and conditions of the GNU General Public
11  * License. See the file "COPYING" in the main directory of this archive
12  * for more details.
13  */
14 
15 #include <linux/errno.h>
16 #include <linux/mm.h>
17 #include <linux/smp.h>
18 #include <linux/syscalls.h>
19 #include <linux/sem.h>
20 #include <linux/msg.h>
21 #include <linux/shm.h>
22 #include <linux/stat.h>
23 #include <linux/mman.h>
24 #include <linux/sys.h>
25 #include <linux/ipc.h>
26 #include <linux/file.h>
27 #include <linux/module.h>
28 #include <linux/err.h>
29 #include <linux/fs.h>
30 #include <linux/semaphore.h>
31 #include <linux/uaccess.h>
32 #include <linux/unistd.h>
33 #include <linux/slab.h>
34 
35 #include <asm/syscalls.h>
36 
37 asmlinkage long microblaze_vfork(struct pt_regs *regs)
38 {
39 	return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->r1,
40 						regs, 0, NULL, NULL);
41 }
42 
43 asmlinkage long microblaze_clone(int flags, unsigned long stack,
44 							struct pt_regs *regs)
45 {
46 	if (!stack)
47 		stack = regs->r1;
48 	return do_fork(flags, stack, regs, 0, NULL, NULL);
49 }
50 
51 asmlinkage long microblaze_execve(const char __user *filenamei,
52 				  const char __user *const __user *argv,
53 				  const char __user *const __user *envp,
54 				  struct pt_regs *regs)
55 {
56 	int error;
57 	char *filename;
58 
59 	filename = getname(filenamei);
60 	error = PTR_ERR(filename);
61 	if (IS_ERR(filename))
62 		goto out;
63 	error = do_execve(filename, argv, envp, regs);
64 	putname(filename);
65 out:
66 	return error;
67 }
68 
69 asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
70 			unsigned long prot, unsigned long flags,
71 			unsigned long fd, off_t pgoff)
72 {
73 	if (pgoff & ~PAGE_MASK)
74 		return -EINVAL;
75 
76 	return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> PAGE_SHIFT);
77 }
78 
79 /*
80  * Do a system call from kernel instead of calling sys_execve so we
81  * end up with proper pt_regs.
82  */
83 int kernel_execve(const char *filename,
84 		  const char *const argv[],
85 		  const char *const envp[])
86 {
87 	register const char *__a __asm__("r5") = filename;
88 	register const void *__b __asm__("r6") = argv;
89 	register const void *__c __asm__("r7") = envp;
90 	register unsigned long __syscall __asm__("r12") = __NR_execve;
91 	register unsigned long __ret __asm__("r3");
92 	__asm__ __volatile__ ("brki r14, 0x8"
93 			: "=r" (__ret), "=r" (__syscall)
94 			: "1" (__syscall), "r" (__a), "r" (__b), "r" (__c)
95 			: "r4", "r8", "r9",
96 			"r10", "r11", "r14", "cc", "memory");
97 	return __ret;
98 }
99