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 /* XXX Make this per-binary type, this way we can detect the type of
  31  * XXX a binary.  Every Sparc executable calls this very early on.
  32  */
  33 asmlinkage unsigned long sys_getpagesize(void)
  34 {
  35         return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
  36 }
  37
  38 #define COLOUR_ALIGN(addr)      (((addr)+SHMLBA-1)&~(SHMLBA-1))
  39
  40 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
  41 {
  42         struct vm_area_struct * vmm;
  43
  44         if (flags & MAP_FIXED) {
  45                 /* We do not accept a shared mapping if it would violate
  46                  * cache aliasing constraints.
  47                  */
  48                 if ((flags & MAP_SHARED) &&
  49                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
  50                         return -EINVAL;
  51                 return addr;
  52         }
  53
  54         /* See asm-sparc/uaccess.h */
  55         if (len > TASK_SIZE - PAGE_SIZE)
  56                 return -ENOMEM;
  57         if (ARCH_SUN4C && len > 0x20000000)
  58                 return -ENOMEM;
  59         if (!addr)
  60                 addr = TASK_UNMAPPED_BASE;
  61
  62         if (flags & MAP_SHARED)
  63                 addr = COLOUR_ALIGN(addr);
  64         else
  65                 addr = PAGE_ALIGN(addr);
  66
  67         for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
  68                 /* At this point:  (!vmm || addr < vmm->vm_end). */
  69                 if (ARCH_SUN4C && addr < 0xe0000000 && 0x20000000 - len < addr) {
  70                         addr = PAGE_OFFSET;
  71                         vmm = find_vma(current->mm, PAGE_OFFSET);
  72                 }
  73                 if (TASK_SIZE - PAGE_SIZE - len < addr)
  74                         return -ENOMEM;
  75                 if (!vmm || addr + len <= vmm->vm_start)
  76                         return addr;
  77                 addr = vmm->vm_end;
  78                 if (flags & MAP_SHARED)
  79                         addr = COLOUR_ALIGN(addr);
  80         }
  81 }
  82
  83 /*
  84  * sys_pipe() is the normal C calling standard for creating
  85  * a pipe. It's not the way unix traditionally does this, though.
  86  */
  87 asmlinkage int sparc_pipe(struct pt_regs *regs)
  88 {
  89         int fd[2];
  90         int error;
  91
  92         error = do_pipe_flags(fd, 0);
  93         if (error)
  94                 goto out;
  95         regs->u_regs[UREG_I1] = fd[1];
  96         error = fd[0];
  97 out:
  98         return error;
  99 }
 100
 101 int sparc_mmap_check(unsigned long addr, unsigned long len)
 102 {
 103         if (ARCH_SUN4C &&
 104             (len > 0x20000000 ||
 105              (addr < 0xe0000000 && addr + len > 0x20000000)))
 106                 return -EINVAL;
 107
 108         /* See asm-sparc/uaccess.h */
 109         if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
 110                 return -EINVAL;
 111
 112         return 0;
 113 }
 114
 115 /* Linux version of mmap */
 116
 117 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
 118         unsigned long prot, unsigned long flags, unsigned long fd,
 119         unsigned long pgoff)
 120 {
 121         /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
 122            we have. */
 123         return sys_mmap_pgoff(addr, len, prot, flags, fd,
 124                               pgoff >> (PAGE_SHIFT - 12));
 125 }
 126
 127 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 128         unsigned long prot, unsigned long flags, unsigned long fd,
 129         unsigned long off)
 130 {
 131         /* no alignment check? */
 132         return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 133 }
 134
 135 long sparc_remap_file_pages(unsigned long start, unsigned long size,
 136                            unsigned long prot, unsigned long pgoff,
 137                            unsigned long flags)
 138 {
 139         /* This works on an existing mmap so we don't need to validate
 140          * the range as that was done at the original mmap call.
 141          */
 142         return sys_remap_file_pages(start, size, prot,
 143                                     (pgoff >> (PAGE_SHIFT - 12)), flags);
 144 }
 145
 146 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 147 asmlinkage unsigned long
 148 c_sys_nis_syscall (struct pt_regs *regs)
 149 {
 150         static int count = 0;
 151
 152         if (count++ > 5)
 153                 return -ENOSYS;
 154         printk ("%s[%d]: Unimplemented SPARC system call %d\n",
 155                 current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
 156 #ifdef DEBUG_UNIMP_SYSCALL
 157         show_regs (regs);
 158 #endif
 159         return -ENOSYS;
 160 }
 161
 162 /* #define DEBUG_SPARC_BREAKPOINT */
 163
 164 asmlinkage void
 165 sparc_breakpoint (struct pt_regs *regs)
 166 {
 167         siginfo_t info;
 168
 169 #ifdef DEBUG_SPARC_BREAKPOINT
 170         printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
 171 #endif
 172         info.si_signo = SIGTRAP;
 173         info.si_errno = 0;
 174         info.si_code = TRAP_BRKPT;
 175         info.si_addr = (void __user *)regs->pc;
 176         info.si_trapno = 0;
 177         force_sig_info(SIGTRAP, &info, current);
 178
 179 #ifdef DEBUG_SPARC_BREAKPOINT
 180         printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
 181 #endif
 182 }
 183
 184 asmlinkage int
 185 sparc_sigaction (int sig, const struct old_sigaction __user *act,
 186                  struct old_sigaction __user *oact)
 187 {
 188         struct k_sigaction new_ka, old_ka;
 189         int ret;
 190
 191         WARN_ON_ONCE(sig >= 0);
 192         sig = -sig;
 193
 194         if (act) {
 195                 unsigned long mask;
 196
 197                 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
 198                     __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
 199                     __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
 200                         return -EFAULT;
 201                 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 202                 __get_user(mask, &act->sa_mask);
 203                 siginitset(&new_ka.sa.sa_mask, mask);
 204                 new_ka.ka_restorer = NULL;
 205         }
 206
 207         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 208
 209         if (!ret && oact) {
 210                 /* In the clone() case we could copy half consistent
 211                  * state to the user, however this could sleep and
 212                  * deadlock us if we held the signal lock on SMP.  So for
 213                  * now I take the easy way out and do no locking.
 214                  */
 215                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
 216                     __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
 217                     __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
 218                         return -EFAULT;
 219                 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 220                 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
 221         }
 222
 223         return ret;
 224 }
 225
 226 asmlinkage long
 227 sys_rt_sigaction(int sig,
 228                  const struct sigaction __user *act,
 229                  struct sigaction __user *oact,
 230                  void __user *restorer,
 231                  size_t sigsetsize)
 232 {
 233         struct k_sigaction new_ka, old_ka;
 234         int ret;
 235
 236         /* XXX: Don't preclude handling different sized sigset_t's.  */
 237         if (sigsetsize != sizeof(sigset_t))
 238                 return -EINVAL;
 239
 240         if (act) {
 241                 new_ka.ka_restorer = restorer;
 242                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 243                         return -EFAULT;
 244         }
 245
 246         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 247
 248         if (!ret && oact) {
 249                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 250                         return -EFAULT;
 251         }
 252
 253         return ret;
 254 }
 255
 256 asmlinkage int sys_getdomainname(char __user *name, int len)
 257 {
 258         int nlen, err;
 259
 260         if (len < 0)
 261                 return -EINVAL;
 262
 263         down_read(&uts_sem);
 264
 265         nlen = strlen(utsname()->domainname) + 1;
 266         err = -EINVAL;
 267         if (nlen > len)
 268                 goto out;
 269
 270         err = -EFAULT;
 271         if (!copy_to_user(name, utsname()->domainname, nlen))
 272                 err = 0;
 273
 274 out:
 275         up_read(&uts_sem);
 276         return err;
 277 }
 278
 279 /*
 280  * Do a system call from kernel instead of calling sys_execve so we
 281  * end up with proper pt_regs.
 282  */
 283 int kernel_execve(const char *filename,
 284                   const char *const argv[],
 285                   const char *const envp[])
 286 {
 287         long __res;
 288         register long __g1 __asm__ ("g1") = __NR_execve;
 289         register long __o0 __asm__ ("o0") = (long)(filename);
 290         register long __o1 __asm__ ("o1") = (long)(argv);
 291         register long __o2 __asm__ ("o2") = (long)(envp);
 292         asm volatile ("t 0x10\n\t"
 293                       "bcc 1f\n\t"
 294                       "mov %%o0, %0\n\t"
 295                       "sub %%g0, %%o0, %0\n\t"
 296                       "1:\n\t"
 297                       : "=r" (__res), "=&r" (__o0)
 298                       : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
 299                       : "cc");
 300         return __res;
 301 }