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/ipc.h>
  23
  24 #include <asm/uaccess.h>
  25 #include <asm/unistd.h>
  26
  27 /* #define DEBUG_UNIMP_SYSCALL */
  28
  29 /* XXX Make this per-binary type, this way we can detect the type of
  30  * XXX a binary.  Every Sparc executable calls this very early on.
  31  */
  32 asmlinkage unsigned long sys_getpagesize(void)
  33 {
  34         return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
  35 }
  36
  37 #define COLOUR_ALIGN(addr)      (((addr)+SHMLBA-1)&~(SHMLBA-1))
  38
  39 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
  40 {
  41         struct vm_area_struct * vmm;
  42
  43         if (flags & MAP_FIXED) {
  44                 /* We do not accept a shared mapping if it would violate
  45                  * cache aliasing constraints.
  46                  */
  47                 if ((flags & MAP_SHARED) &&
  48                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
  49                         return -EINVAL;
  50                 return addr;
  51         }
  52
  53         /* See asm-sparc/uaccess.h */
  54         if (len > TASK_SIZE - PAGE_SIZE)
  55                 return -ENOMEM;
  56         if (ARCH_SUN4C && len > 0x20000000)
  57                 return -ENOMEM;
  58         if (!addr)
  59                 addr = TASK_UNMAPPED_BASE;
  60
  61         if (flags & MAP_SHARED)
  62                 addr = COLOUR_ALIGN(addr);
  63         else
  64                 addr = PAGE_ALIGN(addr);
  65
  66         for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
  67                 /* At this point:  (!vmm || addr < vmm->vm_end). */
  68                 if (ARCH_SUN4C && addr < 0xe0000000 && 0x20000000 - len < addr) {
  69                         addr = PAGE_OFFSET;
  70                         vmm = find_vma(current->mm, PAGE_OFFSET);
  71                 }
  72                 if (TASK_SIZE - PAGE_SIZE - len < addr)
  73                         return -ENOMEM;
  74                 if (!vmm || addr + len <= vmm->vm_start)
  75                         return addr;
  76                 addr = vmm->vm_end;
  77                 if (flags & MAP_SHARED)
  78                         addr = COLOUR_ALIGN(addr);
  79         }
  80 }
  81
  82 /*
  83  * sys_pipe() is the normal C calling standard for creating
  84  * a pipe. It's not the way unix traditionally does this, though.
  85  */
  86 asmlinkage int sparc_pipe(struct pt_regs *regs)
  87 {
  88         int fd[2];
  89         int error;
  90
  91         error = do_pipe_flags(fd, 0);
  92         if (error)
  93                 goto out;
  94         regs->u_regs[UREG_I1] = fd[1];
  95         error = fd[0];
  96 out:
  97         return error;
  98 }
  99
 100 int sparc_mmap_check(unsigned long addr, unsigned long len)
 101 {
 102         if (ARCH_SUN4C &&
 103             (len > 0x20000000 ||
 104              (addr < 0xe0000000 && addr + len > 0x20000000)))
 105                 return -EINVAL;
 106
 107         /* See asm-sparc/uaccess.h */
 108         if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
 109                 return -EINVAL;
 110
 111         return 0;
 112 }
 113
 114 /* Linux version of mmap */
 115
 116 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
 117         unsigned long prot, unsigned long flags, unsigned long fd,
 118         unsigned long pgoff)
 119 {
 120         /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
 121            we have. */
 122         return sys_mmap_pgoff(addr, len, prot, flags, fd,
 123                               pgoff >> (PAGE_SHIFT - 12));
 124 }
 125
 126 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 127         unsigned long prot, unsigned long flags, unsigned long fd,
 128         unsigned long off)
 129 {
 130         /* no alignment check? */
 131         return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 132 }
 133
 134 long sparc_remap_file_pages(unsigned long start, unsigned long size,
 135                            unsigned long prot, unsigned long pgoff,
 136                            unsigned long flags)
 137 {
 138         /* This works on an existing mmap so we don't need to validate
 139          * the range as that was done at the original mmap call.
 140          */
 141         return sys_remap_file_pages(start, size, prot,
 142                                     (pgoff >> (PAGE_SHIFT - 12)), flags);
 143 }
 144
 145 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 146 asmlinkage unsigned long
 147 c_sys_nis_syscall (struct pt_regs *regs)
 148 {
 149         static int count = 0;
 150
 151         if (count++ > 5)
 152                 return -ENOSYS;
 153         printk ("%s[%d]: Unimplemented SPARC system call %d\n",
 154                 current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
 155 #ifdef DEBUG_UNIMP_SYSCALL
 156         show_regs (regs);
 157 #endif
 158         return -ENOSYS;
 159 }
 160
 161 /* #define DEBUG_SPARC_BREAKPOINT */
 162
 163 asmlinkage void
 164 sparc_breakpoint (struct pt_regs *regs)
 165 {
 166         siginfo_t info;
 167
 168 #ifdef DEBUG_SPARC_BREAKPOINT
 169         printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
 170 #endif
 171         info.si_signo = SIGTRAP;
 172         info.si_errno = 0;
 173         info.si_code = TRAP_BRKPT;
 174         info.si_addr = (void __user *)regs->pc;
 175         info.si_trapno = 0;
 176         force_sig_info(SIGTRAP, &info, current);
 177
 178 #ifdef DEBUG_SPARC_BREAKPOINT
 179         printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
 180 #endif
 181 }
 182
 183 asmlinkage int
 184 sparc_sigaction (int sig, const struct old_sigaction __user *act,
 185                  struct old_sigaction __user *oact)
 186 {
 187         struct k_sigaction new_ka, old_ka;
 188         int ret;
 189
 190         WARN_ON_ONCE(sig >= 0);
 191         sig = -sig;
 192
 193         if (act) {
 194                 unsigned long mask;
 195
 196                 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
 197                     __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
 198                     __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
 199                         return -EFAULT;
 200                 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 201                 __get_user(mask, &act->sa_mask);
 202                 siginitset(&new_ka.sa.sa_mask, mask);
 203                 new_ka.ka_restorer = NULL;
 204         }
 205
 206         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 207
 208         if (!ret && oact) {
 209                 /* In the clone() case we could copy half consistent
 210                  * state to the user, however this could sleep and
 211                  * deadlock us if we held the signal lock on SMP.  So for
 212                  * now I take the easy way out and do no locking.
 213                  */
 214                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
 215                     __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
 216                     __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
 217                         return -EFAULT;
 218                 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 219                 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
 220         }
 221
 222         return ret;
 223 }
 224
 225 asmlinkage long
 226 sys_rt_sigaction(int sig,
 227                  const struct sigaction __user *act,
 228                  struct sigaction __user *oact,
 229                  void __user *restorer,
 230                  size_t sigsetsize)
 231 {
 232         struct k_sigaction new_ka, old_ka;
 233         int ret;
 234
 235         /* XXX: Don't preclude handling different sized sigset_t's.  */
 236         if (sigsetsize != sizeof(sigset_t))
 237                 return -EINVAL;
 238
 239         if (act) {
 240                 new_ka.ka_restorer = restorer;
 241                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 242                         return -EFAULT;
 243         }
 244
 245         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 246
 247         if (!ret && oact) {
 248                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 249                         return -EFAULT;
 250         }
 251
 252         return ret;
 253 }
 254
 255 asmlinkage int sys_getdomainname(char __user *name, int len)
 256 {
 257         int nlen, err;
 258
 259         if (len < 0)
 260                 return -EINVAL;
 261
 262         down_read(&uts_sem);
 263
 264         nlen = strlen(utsname()->domainname) + 1;
 265         err = -EINVAL;
 266         if (nlen > len)
 267                 goto out;
 268
 269         err = -EFAULT;
 270         if (!copy_to_user(name, utsname()->domainname, nlen))
 271                 err = 0;
 272
 273 out:
 274         up_read(&uts_sem);
 275         return err;
 276 }
 277
 278 /*
 279  * Do a system call from kernel instead of calling sys_execve so we
 280  * end up with proper pt_regs.
 281  */
 282 int kernel_execve(const char *filename,
 283                   const char *const argv[],
 284                   const char *const envp[])
 285 {
 286         long __res;
 287         register long __g1 __asm__ ("g1") = __NR_execve;
 288         register long __o0 __asm__ ("o0") = (long)(filename);
 289         register long __o1 __asm__ ("o1") = (long)(argv);
 290         register long __o2 __asm__ ("o2") = (long)(envp);
 291         asm volatile ("t 0x10\n\t"
 292                       "bcc 1f\n\t"
 293                       "mov %%o0, %0\n\t"
 294                       "sub %%g0, %%o0, %0\n\t"
 295                       "1:\n\t"
 296                       : "=r" (__res), "=&r" (__o0)
 297                       : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
 298                       : "cc");
 299         return __res;
 300 }