Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/kernel/sys_arm.c |
| 3 | * |
| 4 | * Copyright (C) People who wrote linux/arch/i386/kernel/sys_i386.c |
| 5 | * Copyright (C) 1995, 1996 Russell King. |
| 6 | * |
| 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. |
| 10 | * |
| 11 | * This file contains various random system calls that |
| 12 | * have a non-standard calling sequence on the Linux/arm |
| 13 | * platform. |
| 14 | */ |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/errno.h> |
| 17 | #include <linux/sched.h> |
| 18 | #include <linux/slab.h> |
| 19 | #include <linux/mm.h> |
| 20 | #include <linux/sem.h> |
| 21 | #include <linux/msg.h> |
| 22 | #include <linux/shm.h> |
| 23 | #include <linux/stat.h> |
| 24 | #include <linux/syscalls.h> |
| 25 | #include <linux/mman.h> |
| 26 | #include <linux/fs.h> |
| 27 | #include <linux/file.h> |
Adrian Bunk | cba4fbb | 2007-10-16 23:29:24 -0700 | [diff] [blame] | 28 | #include <linux/ipc.h> |
Russell King | 33fa9b1 | 2008-09-06 11:35:55 +0100 | [diff] [blame] | 29 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | struct mmap_arg_struct { |
| 32 | unsigned long addr; |
| 33 | unsigned long len; |
| 34 | unsigned long prot; |
| 35 | unsigned long flags; |
| 36 | unsigned long fd; |
| 37 | unsigned long offset; |
| 38 | }; |
| 39 | |
| 40 | asmlinkage int old_mmap(struct mmap_arg_struct __user *arg) |
| 41 | { |
| 42 | int error = -EFAULT; |
| 43 | struct mmap_arg_struct a; |
| 44 | |
| 45 | if (copy_from_user(&a, arg, sizeof(a))) |
| 46 | goto out; |
| 47 | |
| 48 | error = -EINVAL; |
| 49 | if (a.offset & ~PAGE_MASK) |
| 50 | goto out; |
| 51 | |
Al Viro | f8b7256 | 2009-11-30 17:37:04 -0500 | [diff] [blame] | 52 | error = sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | out: |
| 54 | return error; |
| 55 | } |
| 56 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | /* |
| 58 | * Perform the select(nd, in, out, ex, tv) and mmap() system |
| 59 | * calls. |
| 60 | */ |
| 61 | |
| 62 | struct sel_arg_struct { |
| 63 | unsigned long n; |
| 64 | fd_set __user *inp, *outp, *exp; |
| 65 | struct timeval __user *tvp; |
| 66 | }; |
| 67 | |
| 68 | asmlinkage int old_select(struct sel_arg_struct __user *arg) |
| 69 | { |
| 70 | struct sel_arg_struct a; |
| 71 | |
| 72 | if (copy_from_user(&a, arg, sizeof(a))) |
| 73 | return -EFAULT; |
| 74 | /* sys_select() does the appropriate kernel locking */ |
| 75 | return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp); |
| 76 | } |
| 77 | |
Nicolas Pitre | dd35afc | 2006-01-14 16:36:12 +0000 | [diff] [blame] | 78 | #if !defined(CONFIG_AEABI) || defined(CONFIG_OABI_COMPAT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | /* |
| 80 | * sys_ipc() is the de-multiplexer for the SysV IPC calls.. |
| 81 | * |
| 82 | * This is really horribly ugly. |
| 83 | */ |
| 84 | asmlinkage int sys_ipc(uint call, int first, int second, int third, |
| 85 | void __user *ptr, long fifth) |
| 86 | { |
| 87 | int version, ret; |
| 88 | |
| 89 | version = call >> 16; /* hack for backward compatibility */ |
| 90 | call &= 0xffff; |
| 91 | |
| 92 | switch (call) { |
| 93 | case SEMOP: |
| 94 | return sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL); |
| 95 | case SEMTIMEDOP: |
| 96 | return sys_semtimedop(first, (struct sembuf __user *)ptr, second, |
| 97 | (const struct timespec __user *)fifth); |
| 98 | |
| 99 | case SEMGET: |
| 100 | return sys_semget (first, second, third); |
| 101 | case SEMCTL: { |
| 102 | union semun fourth; |
| 103 | if (!ptr) |
| 104 | return -EINVAL; |
| 105 | if (get_user(fourth.__pad, (void __user * __user *) ptr)) |
| 106 | return -EFAULT; |
| 107 | return sys_semctl (first, second, third, fourth); |
| 108 | } |
| 109 | |
| 110 | case MSGSND: |
| 111 | return sys_msgsnd(first, (struct msgbuf __user *) ptr, |
| 112 | second, third); |
| 113 | case MSGRCV: |
| 114 | switch (version) { |
| 115 | case 0: { |
| 116 | struct ipc_kludge tmp; |
| 117 | if (!ptr) |
| 118 | return -EINVAL; |
| 119 | if (copy_from_user(&tmp,(struct ipc_kludge __user *)ptr, |
| 120 | sizeof (tmp))) |
| 121 | return -EFAULT; |
| 122 | return sys_msgrcv (first, tmp.msgp, second, |
| 123 | tmp.msgtyp, third); |
| 124 | } |
| 125 | default: |
| 126 | return sys_msgrcv (first, |
| 127 | (struct msgbuf __user *) ptr, |
| 128 | second, fifth, third); |
| 129 | } |
| 130 | case MSGGET: |
| 131 | return sys_msgget ((key_t) first, second); |
| 132 | case MSGCTL: |
| 133 | return sys_msgctl(first, second, (struct msqid_ds __user *)ptr); |
| 134 | |
| 135 | case SHMAT: |
| 136 | switch (version) { |
| 137 | default: { |
| 138 | ulong raddr; |
| 139 | ret = do_shmat(first, (char __user *)ptr, second, &raddr); |
| 140 | if (ret) |
| 141 | return ret; |
| 142 | return put_user(raddr, (ulong __user *)third); |
| 143 | } |
| 144 | case 1: /* Of course, we don't support iBCS2! */ |
| 145 | return -EINVAL; |
| 146 | } |
| 147 | case SHMDT: |
| 148 | return sys_shmdt ((char __user *)ptr); |
| 149 | case SHMGET: |
| 150 | return sys_shmget (first, second, third); |
| 151 | case SHMCTL: |
| 152 | return sys_shmctl (first, second, |
| 153 | (struct shmid_ds __user *) ptr); |
| 154 | default: |
| 155 | return -ENOSYS; |
| 156 | } |
| 157 | } |
Nicolas Pitre | dd35afc | 2006-01-14 16:36:12 +0000 | [diff] [blame] | 158 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | /* Fork a new task - this creates a new program thread. |
| 161 | * This is called indirectly via a small wrapper |
| 162 | */ |
| 163 | asmlinkage int sys_fork(struct pt_regs *regs) |
| 164 | { |
Hyok S. Choi | f24284a | 2006-02-24 21:37:50 +0000 | [diff] [blame] | 165 | #ifdef CONFIG_MMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | return do_fork(SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL); |
Hyok S. Choi | f24284a | 2006-02-24 21:37:50 +0000 | [diff] [blame] | 167 | #else |
| 168 | /* can not support in nommu mode */ |
| 169 | return(-EINVAL); |
| 170 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | } |
| 172 | |
| 173 | /* Clone a task - this clones the calling program thread. |
| 174 | * This is called indirectly via a small wrapper |
| 175 | */ |
| 176 | asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, |
| 177 | int __user *parent_tidptr, int tls_val, |
| 178 | int __user *child_tidptr, struct pt_regs *regs) |
| 179 | { |
| 180 | if (!newsp) |
| 181 | newsp = regs->ARM_sp; |
| 182 | |
| 183 | return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr); |
| 184 | } |
| 185 | |
| 186 | asmlinkage int sys_vfork(struct pt_regs *regs) |
| 187 | { |
| 188 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL); |
| 189 | } |
| 190 | |
| 191 | /* sys_execve() executes a new program. |
| 192 | * This is called indirectly via a small wrapper |
| 193 | */ |
| 194 | asmlinkage int sys_execve(char __user *filenamei, char __user * __user *argv, |
| 195 | char __user * __user *envp, struct pt_regs *regs) |
| 196 | { |
| 197 | int error; |
| 198 | char * filename; |
| 199 | |
| 200 | filename = getname(filenamei); |
| 201 | error = PTR_ERR(filename); |
| 202 | if (IS_ERR(filename)) |
| 203 | goto out; |
| 204 | error = do_execve(filename, argv, envp, regs); |
| 205 | putname(filename); |
| 206 | out: |
| 207 | return error; |
| 208 | } |
| 209 | |
Arnd Bergmann | 3db03b4 | 2006-10-02 02:18:31 -0700 | [diff] [blame] | 210 | int kernel_execve(const char *filename, char *const argv[], char *const envp[]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | { |
| 212 | struct pt_regs regs; |
| 213 | int ret; |
| 214 | |
| 215 | memset(®s, 0, sizeof(struct pt_regs)); |
| 216 | ret = do_execve((char *)filename, (char __user * __user *)argv, |
| 217 | (char __user * __user *)envp, ®s); |
| 218 | if (ret < 0) |
| 219 | goto out; |
| 220 | |
| 221 | /* |
| 222 | * Save argc to the register structure for userspace. |
| 223 | */ |
| 224 | regs.ARM_r0 = ret; |
| 225 | |
| 226 | /* |
| 227 | * We were successful. We won't be returning to our caller, but |
| 228 | * instead to user space by manipulating the kernel stack. |
| 229 | */ |
| 230 | asm( "add r0, %0, %1\n\t" |
| 231 | "mov r1, %2\n\t" |
| 232 | "mov r2, %3\n\t" |
| 233 | "bl memmove\n\t" /* copy regs to top of stack */ |
| 234 | "mov r8, #0\n\t" /* not a syscall */ |
| 235 | "mov r9, %0\n\t" /* thread structure */ |
| 236 | "mov sp, r0\n\t" /* reposition stack pointer */ |
| 237 | "b ret_to_user" |
| 238 | : |
| 239 | : "r" (current_thread_info()), |
Russell King | 4f7a181 | 2005-05-05 13:11:00 +0100 | [diff] [blame] | 240 | "Ir" (THREAD_START_SP - sizeof(regs)), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | "r" (®s), |
| 242 | "Ir" (sizeof(regs)) |
Nicolas Pitre | c2f4808 | 2005-10-04 23:17:53 +0100 | [diff] [blame] | 243 | : "r0", "r1", "r2", "r3", "ip", "lr", "memory"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | |
| 245 | out: |
| 246 | return ret; |
| 247 | } |
Arnd Bergmann | 3db03b4 | 2006-10-02 02:18:31 -0700 | [diff] [blame] | 248 | EXPORT_SYMBOL(kernel_execve); |
Nicolas Pitre | 68d9102 | 2005-09-01 12:37:13 +0100 | [diff] [blame] | 249 | |
| 250 | /* |
Simon Arlott | 6cbdc8c | 2007-05-11 20:40:30 +0100 | [diff] [blame] | 251 | * Since loff_t is a 64 bit type we avoid a lot of ABI hassle |
Nicolas Pitre | 68d9102 | 2005-09-01 12:37:13 +0100 | [diff] [blame] | 252 | * with a different argument ordering. |
| 253 | */ |
| 254 | asmlinkage long sys_arm_fadvise64_64(int fd, int advice, |
| 255 | loff_t offset, loff_t len) |
| 256 | { |
| 257 | return sys_fadvise64_64(fd, offset, len, advice); |
| 258 | } |