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/signal.h>
  11 #include <linux/sched/mm.h>
  12 #include <linux/sched/debug.h>
  13 #include <linux/mm.h>
  14 #include <linux/fs.h>
  15 #include <linux/file.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/utsname.h>
  23 #include <linux/smp.h>
  24 #include <linux/ipc.h>
  25
  26 #include <linux/uaccess.h>
  27 #include <asm/unistd.h>
  28
  29 #include "systbls.h"
  30
  31 /* #define DEBUG_UNIMP_SYSCALL */
  32
  33 /* XXX Make this per-binary type, this way we can detect the type of
  34  * XXX a binary.  Every Sparc executable calls this very early on.
  35  */
  36 asmlinkage unsigned long sys_getpagesize(void)
  37 {
  38         return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
  39 }
  40
  41 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
  42 {
  43         struct vm_unmapped_area_info info;
  44
  45         if (flags & MAP_FIXED) {
  46                 /* We do not accept a shared mapping if it would violate
  47                  * cache aliasing constraints.
  48                  */
  49                 if ((flags & MAP_SHARED) &&
  50                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
  51                         return -EINVAL;
  52                 return addr;
  53         }
  54
  55         /* See asm-sparc/uaccess.h */
  56         if (len > TASK_SIZE - PAGE_SIZE)
  57                 return -ENOMEM;
  58         if (!addr)
  59                 addr = TASK_UNMAPPED_BASE;
  60
  61         info.flags = 0;
  62         info.length = len;
  63         info.low_limit = addr;
  64         info.high_limit = TASK_SIZE;
  65         info.align_mask = (flags & MAP_SHARED) ?
  66                 (PAGE_MASK & (SHMLBA - 1)) : 0;
  67         info.align_offset = pgoff << PAGE_SHIFT;
  68         return vm_unmapped_area(&info);
  69 }
  70
  71 /*
  72  * sys_pipe() is the normal C calling standard for creating
  73  * a pipe. It's not the way unix traditionally does this, though.
  74  */
  75 asmlinkage long sparc_pipe(struct pt_regs *regs)
  76 {
  77         int fd[2];
  78         int error;
  79
  80         error = do_pipe_flags(fd, 0);
  81         if (error)
  82                 goto out;
  83         regs->u_regs[UREG_I1] = fd[1];
  84         error = fd[0];
  85 out:
  86         return error;
  87 }
  88
  89 int sparc_mmap_check(unsigned long addr, unsigned long len)
  90 {
  91         /* See asm-sparc/uaccess.h */
  92         if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
  93                 return -EINVAL;
  94
  95         return 0;
  96 }
  97
  98 /* Linux version of mmap */
  99
 100 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
 101         unsigned long prot, unsigned long flags, unsigned long fd,
 102         unsigned long pgoff)
 103 {
 104         /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
 105            we have. */
 106         return sys_mmap_pgoff(addr, len, prot, flags, fd,
 107                               pgoff >> (PAGE_SHIFT - 12));
 108 }
 109
 110 asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
 111         unsigned long prot, unsigned long flags, unsigned long fd,
 112         unsigned long off)
 113 {
 114         /* no alignment check? */
 115         return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 116 }
 117
 118 long sparc_remap_file_pages(unsigned long start, unsigned long size,
 119                            unsigned long prot, unsigned long pgoff,
 120                            unsigned long flags)
 121 {
 122         /* This works on an existing mmap so we don't need to validate
 123          * the range as that was done at the original mmap call.
 124          */
 125         return sys_remap_file_pages(start, size, prot,
 126                                     (pgoff >> (PAGE_SHIFT - 12)), flags);
 127 }
 128
 129 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 130 asmlinkage unsigned long
 131 c_sys_nis_syscall (struct pt_regs *regs)
 132 {
 133         static int count = 0;
 134
 135         if (count++ > 5)
 136                 return -ENOSYS;
 137         printk ("%s[%d]: Unimplemented SPARC system call %d\n",
 138                 current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
 139 #ifdef DEBUG_UNIMP_SYSCALL
 140         show_regs (regs);
 141 #endif
 142         return -ENOSYS;
 143 }
 144
 145 /* #define DEBUG_SPARC_BREAKPOINT */
 146
 147 asmlinkage void
 148 sparc_breakpoint (struct pt_regs *regs)
 149 {
 150         siginfo_t info;
 151
 152 #ifdef DEBUG_SPARC_BREAKPOINT
 153         printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
 154 #endif
 155         info.si_signo = SIGTRAP;
 156         info.si_errno = 0;
 157         info.si_code = TRAP_BRKPT;
 158         info.si_addr = (void __user *)regs->pc;
 159         info.si_trapno = 0;
 160         force_sig_info(SIGTRAP, &info, current);
 161
 162 #ifdef DEBUG_SPARC_BREAKPOINT
 163         printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
 164 #endif
 165 }
 166
 167 SYSCALL_DEFINE3(sparc_sigaction, int, sig,
 168                 struct old_sigaction __user *,act,
 169                 struct old_sigaction __user *,oact)
 170 {
 171         WARN_ON_ONCE(sig >= 0);
 172         return sys_sigaction(-sig, act, oact);
 173 }
 174
 175 SYSCALL_DEFINE5(rt_sigaction, int, sig,
 176                  const struct sigaction __user *, act,
 177                  struct sigaction __user *, oact,
 178                  void __user *, restorer,
 179                  size_t, sigsetsize)
 180 {
 181         struct k_sigaction new_ka, old_ka;
 182         int ret;
 183
 184         /* XXX: Don't preclude handling different sized sigset_t's.  */
 185         if (sigsetsize != sizeof(sigset_t))
 186                 return -EINVAL;
 187
 188         if (act) {
 189                 new_ka.ka_restorer = restorer;
 190                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 191                         return -EFAULT;
 192         }
 193
 194         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 195
 196         if (!ret && oact) {
 197                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 198                         return -EFAULT;
 199         }
 200
 201         return ret;
 202 }
 203
 204 asmlinkage long sys_getdomainname(char __user *name, int len)
 205 {
 206         int nlen, err;
 207
 208         if (len < 0)
 209                 return -EINVAL;
 210
 211         down_read(&uts_sem);
 212
 213         nlen = strlen(utsname()->domainname) + 1;
 214         err = -EINVAL;
 215         if (nlen > len)
 216                 goto out;
 217
 218         err = -EFAULT;
 219         if (!copy_to_user(name, utsname()->domainname, nlen))
 220                 err = 0;
 221
 222 out:
 223         up_read(&uts_sem);
 224         return err;
 225 }