Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / arch / arm / kernel / sys_arm.c
blob62e7c61d0342754193cf4833b16b57723b081f73
1 /*
2 * linux/arch/arm/kernel/sys_arm.c
4 * Copyright (C) People who wrote linux/arch/i386/kernel/sys_i386.c
5 * Copyright (C) 1995, 1996 Russell King.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 * This file contains various random system calls that
12 * have a non-standard calling sequence on the Linux/arm
13 * platform.
15 #include <linux/module.h>
16 #include <linux/errno.h>
17 #include <linux/sched.h>
18 #include <linux/mm.h>
19 #include <linux/sem.h>
20 #include <linux/msg.h>
21 #include <linux/shm.h>
22 #include <linux/stat.h>
23 #include <linux/syscalls.h>
24 #include <linux/mman.h>
25 #include <linux/fs.h>
26 #include <linux/file.h>
27 #include <linux/ipc.h>
28 #include <linux/uaccess.h>
29 #include <linux/slab.h>
31 /* Fork a new task - this creates a new program thread.
32 * This is called indirectly via a small wrapper
34 asmlinkage int sys_fork(struct pt_regs *regs)
36 #ifdef CONFIG_MMU
37 return do_fork(SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
38 #else
39 /* can not support in nommu mode */
40 return(-EINVAL);
41 #endif
44 /* Clone a task - this clones the calling program thread.
45 * This is called indirectly via a small wrapper
47 asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
48 int __user *parent_tidptr, int tls_val,
49 int __user *child_tidptr, struct pt_regs *regs)
51 if (!newsp)
52 newsp = regs->ARM_sp;
54 return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr);
57 asmlinkage int sys_vfork(struct pt_regs *regs)
59 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
62 /* sys_execve() executes a new program.
63 * This is called indirectly via a small wrapper
65 asmlinkage int sys_execve(const char __user *filenamei,
66 const char __user *const __user *argv,
67 const char __user *const __user *envp, struct pt_regs *regs)
69 int error;
70 char * filename;
72 filename = getname(filenamei);
73 error = PTR_ERR(filename);
74 if (IS_ERR(filename))
75 goto out;
76 error = do_execve(filename, argv, envp, regs);
77 putname(filename);
78 out:
79 return error;
82 int kernel_execve(const char *filename,
83 const char *const argv[],
84 const char *const envp[])
86 struct pt_regs regs;
87 int ret;
89 memset(&regs, 0, sizeof(struct pt_regs));
90 ret = do_execve(filename,
91 (const char __user *const __user *)argv,
92 (const char __user *const __user *)envp, &regs);
93 if (ret < 0)
94 goto out;
97 * Save argc to the register structure for userspace.
99 regs.ARM_r0 = ret;
102 * We were successful. We won't be returning to our caller, but
103 * instead to user space by manipulating the kernel stack.
105 asm( "add r0, %0, %1\n\t"
106 "mov r1, %2\n\t"
107 "mov r2, %3\n\t"
108 "bl memmove\n\t" /* copy regs to top of stack */
109 "mov r8, #0\n\t" /* not a syscall */
110 "mov r9, %0\n\t" /* thread structure */
111 "mov sp, r0\n\t" /* reposition stack pointer */
112 "b ret_to_user"
114 : "r" (current_thread_info()),
115 "Ir" (THREAD_START_SP - sizeof(regs)),
116 "r" (&regs),
117 "Ir" (sizeof(regs))
118 : "r0", "r1", "r2", "r3", "ip", "lr", "memory");
120 out:
121 return ret;
123 EXPORT_SYMBOL(kernel_execve);
126 * Since loff_t is a 64 bit type we avoid a lot of ABI hassle
127 * with a different argument ordering.
129 asmlinkage long sys_arm_fadvise64_64(int fd, int advice,
130 loff_t offset, loff_t len)
132 return sys_fadvise64_64(fd, offset, len, advice);