release/src-rt-6.x.4708/linux/linux-2.6.36/arch/sparc/kernel/sys_sparc_32.c

   1 /* linux/arch/sparc/kernel/sys_sparc.c
   2  *
   3  * This file contains various random system calls that
   4  * have a non-standard calling sequence on the Linux/sparc
   5  * platform.
   6  */
   7
   8 #include <linux/errno.h>
   9 #include <linux/types.h>
  10 #include <linux/sched.h>
  11 #include <linux/mm.h>
  12 #include <linux/fs.h>
  13 #include <linux/file.h>
  14 #include <linux/sem.h>
  15 #include <linux/msg.h>
  16 #include <linux/shm.h>
  17 #include <linux/stat.h>
  18 #include <linux/syscalls.h>
  19 #include <linux/mman.h>
  20 #include <linux/utsname.h>
  21 #include <linux/smp.h>
  22 #include <linux/smp_lock.h>
  23 #include <linux/ipc.h>
  24
  25 #include <asm/uaccess.h>
  26 #include <asm/unistd.h>
  27
  28 /* #define DEBUG_UNIMP_SYSCALL */
  29
  30 asmlinkage unsigned long sys_getpagesize(void)
  31 {
  32         return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
  33 }
  34
  35 #define COLOUR_ALIGN(addr)      (((addr)+SHMLBA-1)&~(SHMLBA-1))
  36
  37 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
  38 {
  39         struct vm_area_struct * vmm;
  40
  41         if (flags & MAP_FIXED) {
  42                 /* We do not accept a shared mapping if it would violate
  43                  * cache aliasing constraints.
  44                  */
  45                 if ((flags & MAP_SHARED) &&
  46                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
  47                         return -EINVAL;
  48                 return addr;
  49         }
  50
  51         /* See asm-sparc/uaccess.h */
  52         if (len > TASK_SIZE - PAGE_SIZE)
  53                 return -ENOMEM;
  54         if (ARCH_SUN4C && len > 0x20000000)
  55                 return -ENOMEM;
  56         if (!addr)
  57                 addr = TASK_UNMAPPED_BASE;
  58
  59         if (flags & MAP_SHARED)
  60                 addr = COLOUR_ALIGN(addr);
  61         else
  62                 addr = PAGE_ALIGN(addr);
  63
  64         for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
  65                 /* At this point:  (!vmm || addr < vmm->vm_end). */
  66                 if (ARCH_SUN4C && addr < 0xe0000000 && 0x20000000 - len < addr) {
  67                         addr = PAGE_OFFSET;
  68                         vmm = find_vma(current->mm, PAGE_OFFSET);
  69                 }
  70                 if (TASK_SIZE - PAGE_SIZE - len < addr)
  71                         return -ENOMEM;
  72                 if (!vmm || addr + len <= vmm->vm_start)
  73                         return addr;
  74                 addr = vmm->vm_end;
  75                 if (flags & MAP_SHARED)
  76                         addr = COLOUR_ALIGN(addr);
  77         }
  78 }
  79
  80 /*
  81  * sys_pipe() is the normal C calling standard for creating
  82  * a pipe. It's not the way unix traditionally does this, though.
  83  */
  84 asmlinkage int sparc_pipe(struct pt_regs *regs)
  85 {
  86         int fd[2];
  87         int error;
  88
  89         error = do_pipe_flags(fd, 0);
  90         if (error)
  91                 goto out;
  92         regs->u_regs[UREG_I1] = fd[1];
  93         error = fd[0];
  94 out:
  95         return error;
  96 }
  97
  98 int sparc_mmap_check(unsigned long addr, unsigned long len)
  99 {
 100         if (ARCH_SUN4C &&
 101             (len > 0x20000000 ||
 102              (addr < 0xe0000000 && addr + len > 0x20000000)))
 103                 return -EINVAL;
 104
 105         /* See asm-sparc/uaccess.h */
 106         if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
 107                 return -EINVAL;
 108
 109         return 0;
 110 }
 111
 112 /* Linux version of mmap */
 113
 114 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
 115         unsigned long prot, unsigned long flags, unsigned long fd,
 116         unsigned long pgoff)
 117 {
 118         /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
 119            we have. */
 120         return sys_mmap_pgoff(addr, len, prot, flags, fd,
 121                               pgoff >> (PAGE_SHIFT - 12));
 122 }
 123
 124 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 125         unsigned long prot, unsigned long flags, unsigned long fd,
 126         unsigned long off)
 127 {
 128         /* no alignment check? */
 129         return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 130 }
 131
 132 long sparc_remap_file_pages(unsigned long start, unsigned long size,
 133                            unsigned long prot, unsigned long pgoff,
 134                            unsigned long flags)
 135 {
 136         /* This works on an existing mmap so we don't need to validate
 137          * the range as that was done at the original mmap call.
 138          */
 139         return sys_remap_file_pages(start, size, prot,
 140                                     (pgoff >> (PAGE_SHIFT - 12)), flags);
 141 }
 142
 143 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 144 asmlinkage unsigned long
 145 c_sys_nis_syscall (struct pt_regs *regs)
 146 {
 147         static int count = 0;
 148
 149         if (count++ > 5)
 150                 return -ENOSYS;
 151         printk ("%s[%d]: Unimplemented SPARC system call %d\n",
 152                 current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
 153 #ifdef DEBUG_UNIMP_SYSCALL
 154         show_regs (regs);
 155 #endif
 156         return -ENOSYS;
 157 }
 158
 159 /* #define DEBUG_SPARC_BREAKPOINT */
 160
 161 asmlinkage void
 162 sparc_breakpoint (struct pt_regs *regs)
 163 {
 164         siginfo_t info;
 165
 166 #ifdef DEBUG_SPARC_BREAKPOINT
 167         printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
 168 #endif
 169         info.si_signo = SIGTRAP;
 170         info.si_errno = 0;
 171         info.si_code = TRAP_BRKPT;
 172         info.si_addr = (void __user *)regs->pc;
 173         info.si_trapno = 0;
 174         force_sig_info(SIGTRAP, &info, current);
 175
 176 #ifdef DEBUG_SPARC_BREAKPOINT
 177         printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
 178 #endif
 179 }
 180
 181 asmlinkage int
 182 sparc_sigaction (int sig, const struct old_sigaction __user *act,
 183                  struct old_sigaction __user *oact)
 184 {
 185         struct k_sigaction new_ka, old_ka;
 186         int ret;
 187
 188         WARN_ON_ONCE(sig >= 0);
 189         sig = -sig;
 190
 191         if (act) {
 192                 unsigned long mask;
 193
 194                 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
 195                     __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
 196                     __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
 197                         return -EFAULT;
 198                 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 199                 __get_user(mask, &act->sa_mask);
 200                 siginitset(&new_ka.sa.sa_mask, mask);
 201                 new_ka.ka_restorer = NULL;
 202         }
 203
 204         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 205
 206         if (!ret && oact) {
 207                 /* In the clone() case we could copy half consistent
 208                  * state to the user, however this could sleep and
 209                  * deadlock us if we held the signal lock on SMP.  So for
 210                  * now I take the easy way out and do no locking.
 211                  */
 212                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
 213                     __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
 214                     __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
 215                         return -EFAULT;
 216                 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 217                 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
 218         }
 219
 220         return ret;
 221 }
 222
 223 asmlinkage long
 224 sys_rt_sigaction(int sig,
 225                  const struct sigaction __user *act,
 226                  struct sigaction __user *oact,
 227                  void __user *restorer,
 228                  size_t sigsetsize)
 229 {
 230         struct k_sigaction new_ka, old_ka;
 231         int ret;
 232
 233         if (sigsetsize != sizeof(sigset_t))
 234                 return -EINVAL;
 235
 236         if (act) {
 237                 new_ka.ka_restorer = restorer;
 238                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 239                         return -EFAULT;
 240         }
 241
 242         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 243
 244         if (!ret && oact) {
 245                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 246                         return -EFAULT;
 247         }
 248
 249         return ret;
 250 }
 251
 252 asmlinkage int sys_getdomainname(char __user *name, int len)
 253 {
 254         int nlen, err;
 255
 256         if (len < 0)
 257                 return -EINVAL;
 258
 259         down_read(&uts_sem);
 260
 261         nlen = strlen(utsname()->domainname) + 1;
 262         err = -EINVAL;
 263         if (nlen > len)
 264                 goto out;
 265
 266         err = -EFAULT;
 267         if (!copy_to_user(name, utsname()->domainname, nlen))
 268                 err = 0;
 269
 270 out:
 271         up_read(&uts_sem);
 272         return err;
 273 }
 274
 275 /*
 276  * Do a system call from kernel instead of calling sys_execve so we
 277  * end up with proper pt_regs.
 278  */
 279 int kernel_execve(const char *filename,
 280                   const char *const argv[],
 281                   const char *const envp[])
 282 {
 283         long __res;
 284         register long __g1 __asm__ ("g1") = __NR_execve;
 285         register long __o0 __asm__ ("o0") = (long)(filename);
 286         register long __o1 __asm__ ("o1") = (long)(argv);
 287         register long __o2 __asm__ ("o2") = (long)(envp);
 288         asm volatile ("t 0x10\n\t"
 289                       "bcc 1f\n\t"
 290                       "mov %%o0, %0\n\t"
 291                       "sub %%g0, %%o0, %0\n\t"
 292                       "1:\n\t"
 293                       : "=r" (__res), "=&r" (__o0)
 294                       : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
 295                       : "cc");
 296         return __res;
 297 }