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 <linux/uaccess.h>
  25 #include <asm/unistd.h>
  26
  27 #include "systbls.h"
  28
  29 /* #define DEBUG_UNIMP_SYSCALL */
  30
  31 /* XXX Make this per-binary type, this way we can detect the type of
  32  * XXX a binary.  Every Sparc executable calls this very early on.
  33  */
  34 asmlinkage unsigned long sys_getpagesize(void)
  35 {
  36         return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
  37 }
  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_unmapped_area_info info;
  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 (!addr)
  57                 addr = TASK_UNMAPPED_BASE;
  58
  59         info.flags = 0;
  60         info.length = len;
  61         info.low_limit = addr;
  62         info.high_limit = TASK_SIZE;
  63         info.align_mask = (flags & MAP_SHARED) ?
  64                 (PAGE_MASK & (SHMLBA - 1)) : 0;
  65         info.align_offset = pgoff << PAGE_SHIFT;
  66         return vm_unmapped_area(&info);
  67 }
  68
  69 /*
  70  * sys_pipe() is the normal C calling standard for creating
  71  * a pipe. It's not the way unix traditionally does this, though.
  72  */
  73 asmlinkage long sparc_pipe(struct pt_regs *regs)
  74 {
  75         int fd[2];
  76         int error;
  77
  78         error = do_pipe_flags(fd, 0);
  79         if (error)
  80                 goto out;
  81         regs->u_regs[UREG_I1] = fd[1];
  82         error = fd[0];
  83 out:
  84         return error;
  85 }
  86
  87 int sparc_mmap_check(unsigned long addr, unsigned long len)
  88 {
  89         /* See asm-sparc/uaccess.h */
  90         if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
  91                 return -EINVAL;
  92
  93         return 0;
  94 }
  95
  96 /* Linux version of mmap */
  97
  98 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
  99         unsigned long prot, unsigned long flags, unsigned long fd,
 100         unsigned long pgoff)
 101 {
 102         /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
 103            we have. */
 104         return sys_mmap_pgoff(addr, len, prot, flags, fd,
 105                               pgoff >> (PAGE_SHIFT - 12));
 106 }
 107
 108 asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
 109         unsigned long prot, unsigned long flags, unsigned long fd,
 110         unsigned long off)
 111 {
 112         /* no alignment check? */
 113         return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 114 }
 115
 116 long sparc_remap_file_pages(unsigned long start, unsigned long size,
 117                            unsigned long prot, unsigned long pgoff,
 118                            unsigned long flags)
 119 {
 120         /* This works on an existing mmap so we don't need to validate
 121          * the range as that was done at the original mmap call.
 122          */
 123         return sys_remap_file_pages(start, size, prot,
 124                                     (pgoff >> (PAGE_SHIFT - 12)), flags);
 125 }
 126
 127 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 128 asmlinkage unsigned long
 129 c_sys_nis_syscall (struct pt_regs *regs)
 130 {
 131         static int count = 0;
 132
 133         if (count++ > 5)
 134                 return -ENOSYS;
 135         printk ("%s[%d]: Unimplemented SPARC system call %d\n",
 136                 current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
 137 #ifdef DEBUG_UNIMP_SYSCALL
 138         show_regs (regs);
 139 #endif
 140         return -ENOSYS;
 141 }
 142
 143 /* #define DEBUG_SPARC_BREAKPOINT */
 144
 145 asmlinkage void
 146 sparc_breakpoint (struct pt_regs *regs)
 147 {
 148         siginfo_t info;
 149
 150 #ifdef DEBUG_SPARC_BREAKPOINT
 151         printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
 152 #endif
 153         info.si_signo = SIGTRAP;
 154         info.si_errno = 0;
 155         info.si_code = TRAP_BRKPT;
 156         info.si_addr = (void __user *)regs->pc;
 157         info.si_trapno = 0;
 158         force_sig_info(SIGTRAP, &info, current);
 159
 160 #ifdef DEBUG_SPARC_BREAKPOINT
 161         printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
 162 #endif
 163 }
 164
 165 SYSCALL_DEFINE3(sparc_sigaction, int, sig,
 166                 struct old_sigaction __user *,act,
 167                 struct old_sigaction __user *,oact)
 168 {
 169         WARN_ON_ONCE(sig >= 0);
 170         return sys_sigaction(-sig, act, oact);
 171 }
 172
 173 SYSCALL_DEFINE5(rt_sigaction, int, sig,
 174                  const struct sigaction __user *, act,
 175                  struct sigaction __user *, oact,
 176                  void __user *, restorer,
 177                  size_t, sigsetsize)
 178 {
 179         struct k_sigaction new_ka, old_ka;
 180         int ret;
 181
 182         /* XXX: Don't preclude handling different sized sigset_t's.  */
 183         if (sigsetsize != sizeof(sigset_t))
 184                 return -EINVAL;
 185
 186         if (act) {
 187                 new_ka.ka_restorer = restorer;
 188                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 189                         return -EFAULT;
 190         }
 191
 192         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 193
 194         if (!ret && oact) {
 195                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 196                         return -EFAULT;
 197         }
 198
 199         return ret;
 200 }
 201
 202 asmlinkage long sys_getdomainname(char __user *name, int len)
 203 {
 204         int nlen, err;
 205
 206         if (len < 0)
 207                 return -EINVAL;
 208
 209         down_read(&uts_sem);
 210
 211         nlen = strlen(utsname()->domainname) + 1;
 212         err = -EINVAL;
 213         if (nlen > len)
 214                 goto out;
 215
 216         err = -EFAULT;
 217         if (!copy_to_user(name, utsname()->domainname, nlen))
 218                 err = 0;
 219
 220 out:
 221         up_read(&uts_sem);
 222         return err;
 223 }