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Linux/arch/sparc/kernel/sys_sparc_32.c

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  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 }
226 

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