Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/sh/kernel/sys_sh.c |
| 3 | * |
| 4 | * This file contains various random system calls that |
| 5 | * have a non-standard calling sequence on the Linux/SuperH |
| 6 | * platform. |
| 7 | * |
| 8 | * Taken from i386 version. |
| 9 | */ |
| 10 | |
| 11 | #include <linux/errno.h> |
| 12 | #include <linux/sched.h> |
| 13 | #include <linux/mm.h> |
| 14 | #include <linux/smp.h> |
| 15 | #include <linux/smp_lock.h> |
| 16 | #include <linux/sem.h> |
| 17 | #include <linux/msg.h> |
| 18 | #include <linux/shm.h> |
| 19 | #include <linux/stat.h> |
| 20 | #include <linux/syscalls.h> |
| 21 | #include <linux/mman.h> |
| 22 | #include <linux/file.h> |
| 23 | #include <linux/utsname.h> |
| 24 | |
| 25 | #include <asm/uaccess.h> |
| 26 | #include <asm/ipc.h> |
| 27 | |
| 28 | /* |
| 29 | * sys_pipe() is the normal C calling standard for creating |
| 30 | * a pipe. It's not the way Unix traditionally does this, though. |
| 31 | */ |
| 32 | asmlinkage int sys_pipe(unsigned long r4, unsigned long r5, |
| 33 | unsigned long r6, unsigned long r7, |
| 34 | struct pt_regs regs) |
| 35 | { |
| 36 | int fd[2]; |
| 37 | int error; |
| 38 | |
| 39 | error = do_pipe(fd); |
| 40 | if (!error) { |
| 41 | regs.regs[1] = fd[1]; |
| 42 | return fd[0]; |
| 43 | } |
| 44 | return error; |
| 45 | } |
| 46 | |
| 47 | #if defined(HAVE_ARCH_UNMAPPED_AREA) |
| 48 | /* |
| 49 | * To avoid cache alias, we map the shard page with same color. |
| 50 | */ |
| 51 | #define COLOUR_ALIGN(addr) (((addr)+SHMLBA-1)&~(SHMLBA-1)) |
| 52 | |
| 53 | unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, |
| 54 | unsigned long len, unsigned long pgoff, unsigned long flags) |
| 55 | { |
| 56 | struct mm_struct *mm = current->mm; |
| 57 | struct vm_area_struct *vma; |
| 58 | unsigned long start_addr; |
| 59 | |
| 60 | if (flags & MAP_FIXED) { |
| 61 | /* We do not accept a shared mapping if it would violate |
| 62 | * cache aliasing constraints. |
| 63 | */ |
| 64 | if ((flags & MAP_SHARED) && (addr & (SHMLBA - 1))) |
| 65 | return -EINVAL; |
| 66 | return addr; |
| 67 | } |
| 68 | |
| 69 | if (len > TASK_SIZE) |
| 70 | return -ENOMEM; |
| 71 | |
| 72 | if (addr) { |
| 73 | if (flags & MAP_PRIVATE) |
| 74 | addr = PAGE_ALIGN(addr); |
| 75 | else |
| 76 | addr = COLOUR_ALIGN(addr); |
| 77 | vma = find_vma(mm, addr); |
| 78 | if (TASK_SIZE - len >= addr && |
| 79 | (!vma || addr + len <= vma->vm_start)) |
| 80 | return addr; |
| 81 | } |
| 82 | if (flags & MAP_PRIVATE) |
| 83 | addr = PAGE_ALIGN(mm->free_area_cache); |
| 84 | else |
| 85 | addr = COLOUR_ALIGN(mm->free_area_cache); |
| 86 | start_addr = addr; |
| 87 | |
| 88 | full_search: |
| 89 | for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { |
| 90 | /* At this point: (!vma || addr < vma->vm_end). */ |
| 91 | if (TASK_SIZE - len < addr) { |
| 92 | /* |
| 93 | * Start a new search - just in case we missed |
| 94 | * some holes. |
| 95 | */ |
| 96 | if (start_addr != TASK_UNMAPPED_BASE) { |
| 97 | start_addr = addr = TASK_UNMAPPED_BASE; |
| 98 | goto full_search; |
| 99 | } |
| 100 | return -ENOMEM; |
| 101 | } |
| 102 | if (!vma || addr + len <= vma->vm_start) { |
| 103 | /* |
| 104 | * Remember the place where we stopped the search: |
| 105 | */ |
| 106 | mm->free_area_cache = addr + len; |
| 107 | return addr; |
| 108 | } |
| 109 | addr = vma->vm_end; |
| 110 | if (!(flags & MAP_PRIVATE)) |
| 111 | addr = COLOUR_ALIGN(addr); |
| 112 | } |
| 113 | } |
| 114 | #endif |
| 115 | |
| 116 | static inline long |
| 117 | do_mmap2(unsigned long addr, unsigned long len, unsigned long prot, |
| 118 | unsigned long flags, int fd, unsigned long pgoff) |
| 119 | { |
| 120 | int error = -EBADF; |
| 121 | struct file *file = NULL; |
| 122 | |
| 123 | flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); |
| 124 | if (!(flags & MAP_ANONYMOUS)) { |
| 125 | file = fget(fd); |
| 126 | if (!file) |
| 127 | goto out; |
| 128 | } |
| 129 | |
| 130 | down_write(¤t->mm->mmap_sem); |
| 131 | error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); |
| 132 | up_write(¤t->mm->mmap_sem); |
| 133 | |
| 134 | if (file) |
| 135 | fput(file); |
| 136 | out: |
| 137 | return error; |
| 138 | } |
| 139 | |
| 140 | asmlinkage int old_mmap(unsigned long addr, unsigned long len, |
| 141 | unsigned long prot, unsigned long flags, |
| 142 | int fd, unsigned long off) |
| 143 | { |
| 144 | if (off & ~PAGE_MASK) |
| 145 | return -EINVAL; |
| 146 | return do_mmap2(addr, len, prot, flags, fd, off>>PAGE_SHIFT); |
| 147 | } |
| 148 | |
| 149 | asmlinkage long sys_mmap2(unsigned long addr, unsigned long len, |
| 150 | unsigned long prot, unsigned long flags, |
| 151 | unsigned long fd, unsigned long pgoff) |
| 152 | { |
| 153 | return do_mmap2(addr, len, prot, flags, fd, pgoff); |
| 154 | } |
| 155 | |
| 156 | /* |
| 157 | * sys_ipc() is the de-multiplexer for the SysV IPC calls.. |
| 158 | * |
| 159 | * This is really horribly ugly. |
| 160 | */ |
| 161 | asmlinkage int sys_ipc(uint call, int first, int second, |
| 162 | int third, void __user *ptr, long fifth) |
| 163 | { |
| 164 | int version, ret; |
| 165 | |
| 166 | version = call >> 16; /* hack for backward compatibility */ |
| 167 | call &= 0xffff; |
| 168 | |
| 169 | if (call <= SEMCTL) |
| 170 | switch (call) { |
| 171 | case SEMOP: |
| 172 | return sys_semtimedop(first, (struct sembuf __user *)ptr, |
| 173 | second, NULL); |
| 174 | case SEMTIMEDOP: |
| 175 | return sys_semtimedop(first, (struct sembuf __user *)ptr, |
| 176 | second, |
| 177 | (const struct timespec __user *)fifth); |
| 178 | case SEMGET: |
| 179 | return sys_semget (first, second, third); |
| 180 | case SEMCTL: { |
| 181 | union semun fourth; |
| 182 | if (!ptr) |
| 183 | return -EINVAL; |
| 184 | if (get_user(fourth.__pad, (void * __user *) ptr)) |
| 185 | return -EFAULT; |
| 186 | return sys_semctl (first, second, third, fourth); |
| 187 | } |
| 188 | default: |
| 189 | return -EINVAL; |
| 190 | } |
| 191 | |
| 192 | if (call <= MSGCTL) |
| 193 | switch (call) { |
| 194 | case MSGSND: |
| 195 | return sys_msgsnd (first, (struct msgbuf __user *) ptr, |
| 196 | second, third); |
| 197 | case MSGRCV: |
| 198 | switch (version) { |
| 199 | case 0: { |
| 200 | struct ipc_kludge tmp; |
| 201 | if (!ptr) |
| 202 | return -EINVAL; |
| 203 | |
| 204 | if (copy_from_user(&tmp, |
| 205 | (struct ipc_kludge __user *) ptr, |
| 206 | sizeof (tmp))) |
| 207 | return -EFAULT; |
| 208 | return sys_msgrcv (first, tmp.msgp, second, |
| 209 | tmp.msgtyp, third); |
| 210 | } |
| 211 | default: |
| 212 | return sys_msgrcv (first, |
| 213 | (struct msgbuf __user *) ptr, |
| 214 | second, fifth, third); |
| 215 | } |
| 216 | case MSGGET: |
| 217 | return sys_msgget ((key_t) first, second); |
| 218 | case MSGCTL: |
| 219 | return sys_msgctl (first, second, |
| 220 | (struct msqid_ds __user *) ptr); |
| 221 | default: |
| 222 | return -EINVAL; |
| 223 | } |
| 224 | if (call <= SHMCTL) |
| 225 | switch (call) { |
| 226 | case SHMAT: |
| 227 | switch (version) { |
| 228 | default: { |
| 229 | ulong raddr; |
| 230 | ret = do_shmat (first, (char __user *) ptr, |
| 231 | second, &raddr); |
| 232 | if (ret) |
| 233 | return ret; |
| 234 | return put_user (raddr, (ulong __user *) third); |
| 235 | } |
| 236 | case 1: /* iBCS2 emulator entry point */ |
| 237 | if (!segment_eq(get_fs(), get_ds())) |
| 238 | return -EINVAL; |
| 239 | return do_shmat (first, (char __user *) ptr, |
| 240 | second, (ulong *) third); |
| 241 | } |
| 242 | case SHMDT: |
| 243 | return sys_shmdt ((char __user *)ptr); |
| 244 | case SHMGET: |
| 245 | return sys_shmget (first, second, third); |
| 246 | case SHMCTL: |
| 247 | return sys_shmctl (first, second, |
| 248 | (struct shmid_ds __user *) ptr); |
| 249 | default: |
| 250 | return -EINVAL; |
| 251 | } |
| 252 | |
| 253 | return -EINVAL; |
| 254 | } |
| 255 | |
| 256 | asmlinkage int sys_uname(struct old_utsname * name) |
| 257 | { |
| 258 | int err; |
| 259 | if (!name) |
| 260 | return -EFAULT; |
| 261 | down_read(&uts_sem); |
| 262 | err=copy_to_user(name, &system_utsname, sizeof (*name)); |
| 263 | up_read(&uts_sem); |
| 264 | return err?-EFAULT:0; |
| 265 | } |
| 266 | |
| 267 | asmlinkage ssize_t sys_pread_wrapper(unsigned int fd, char * buf, |
| 268 | size_t count, long dummy, loff_t pos) |
| 269 | { |
| 270 | return sys_pread64(fd, buf, count, pos); |
| 271 | } |
| 272 | |
| 273 | asmlinkage ssize_t sys_pwrite_wrapper(unsigned int fd, const char * buf, |
| 274 | size_t count, long dummy, loff_t pos) |
| 275 | { |
| 276 | return sys_pwrite64(fd, buf, count, pos); |
| 277 | } |
| 278 | |
| 279 | asmlinkage int sys_fadvise64_64_wrapper(int fd, u32 offset0, u32 offset1, |
| 280 | u32 len0, u32 len1, int advice) |
| 281 | { |
| 282 | #ifdef __LITTLE_ENDIAN__ |
| 283 | return sys_fadvise64_64(fd, (u64)offset1 << 32 | offset0, |
| 284 | (u64)len1 << 32 | len0, advice); |
| 285 | #else |
| 286 | return sys_fadvise64_64(fd, (u64)offset0 << 32 | offset1, |
| 287 | (u64)len0 << 32 | len1, advice); |
| 288 | #endif |
| 289 | } |