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Linux/arch/sparc/kernel/sys_sparc_32.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /* linux/arch/sparc/kernel/sys_sparc.c
  3  *
  4  * This file contains various random system calls that
  5  * have a non-standard calling sequence on the Linux/sparc
  6  * platform.
  7  */
  8 
  9 #include <linux/errno.h>
 10 #include <linux/types.h>
 11 #include <linux/sched/signal.h>
 12 #include <linux/sched/mm.h>
 13 #include <linux/sched/debug.h>
 14 #include <linux/mm.h>
 15 #include <linux/fs.h>
 16 #include <linux/file.h>
 17 #include <linux/sem.h>
 18 #include <linux/msg.h>
 19 #include <linux/shm.h>
 20 #include <linux/stat.h>
 21 #include <linux/syscalls.h>
 22 #include <linux/mman.h>
 23 #include <linux/utsname.h>
 24 #include <linux/smp.h>
 25 #include <linux/ipc.h>
 26 
 27 #include <linux/uaccess.h>
 28 #include <asm/unistd.h>
 29 
 30 #include "systbls.h"
 31 
 32 /* #define DEBUG_UNIMP_SYSCALL */
 33 
 34 /* XXX Make this per-binary type, this way we can detect the type of
 35  * XXX a binary.  Every Sparc executable calls this very early on.
 36  */
 37 SYSCALL_DEFINE0(getpagesize)
 38 {
 39         return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
 40 }
 41 
 42 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 43 {
 44         struct vm_unmapped_area_info info;
 45 
 46         if (flags & MAP_FIXED) {
 47                 /* We do not accept a shared mapping if it would violate
 48                  * cache aliasing constraints.
 49                  */
 50                 if ((flags & MAP_SHARED) &&
 51                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
 52                         return -EINVAL;
 53                 return addr;
 54         }
 55 
 56         /* See asm-sparc/uaccess.h */
 57         if (len > TASK_SIZE - PAGE_SIZE)
 58                 return -ENOMEM;
 59         if (!addr)
 60                 addr = TASK_UNMAPPED_BASE;
 61 
 62         info.flags = 0;
 63         info.length = len;
 64         info.low_limit = addr;
 65         info.high_limit = TASK_SIZE;
 66         info.align_mask = (flags & MAP_SHARED) ?
 67                 (PAGE_MASK & (SHMLBA - 1)) : 0;
 68         info.align_offset = pgoff << PAGE_SHIFT;
 69         return vm_unmapped_area(&info);
 70 }
 71 
 72 /*
 73  * sys_pipe() is the normal C calling standard for creating
 74  * a pipe. It's not the way unix traditionally does this, though.
 75  */
 76 SYSCALL_DEFINE0(sparc_pipe)
 77 {
 78         int fd[2];
 79         int error;
 80 
 81         error = do_pipe_flags(fd, 0);
 82         if (error)
 83                 goto out;
 84         current_pt_regs()->u_regs[UREG_I1] = fd[1];
 85         error = fd[0];
 86 out:
 87         return error;
 88 }
 89 
 90 int sparc_mmap_check(unsigned long addr, unsigned long len)
 91 {
 92         /* See asm-sparc/uaccess.h */
 93         if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
 94                 return -EINVAL;
 95 
 96         return 0;
 97 }
 98 
 99 /* Linux version of mmap */
100 
101 SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
102         unsigned long, prot, unsigned long, flags, unsigned long, fd,
103         unsigned long, pgoff)
104 {
105         /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
106            we have. */
107         return ksys_mmap_pgoff(addr, len, prot, flags, fd,
108                                pgoff >> (PAGE_SHIFT - 12));
109 }
110 
111 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
112         unsigned long, prot, unsigned long, flags, unsigned long, fd,
113         unsigned long, off)
114 {
115         /* no alignment check? */
116         return ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
117 }
118 
119 SYSCALL_DEFINE5(sparc_remap_file_pages, unsigned long, start, unsigned long, size,
120                            unsigned long, prot, unsigned long, pgoff,
121                            unsigned long, flags)
122 {
123         /* This works on an existing mmap so we don't need to validate
124          * the range as that was done at the original mmap call.
125          */
126         return sys_remap_file_pages(start, size, prot,
127                                     (pgoff >> (PAGE_SHIFT - 12)), flags);
128 }
129 
130 SYSCALL_DEFINE0(nis_syscall)
131 {
132         static int count = 0;
133         struct pt_regs *regs = current_pt_regs();
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 
151 #ifdef DEBUG_SPARC_BREAKPOINT
152         printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
153 #endif
154         force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->pc, 0, current);
155 
156 #ifdef DEBUG_SPARC_BREAKPOINT
157         printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
158 #endif
159 }
160 
161 SYSCALL_DEFINE3(sparc_sigaction, int, sig,
162                 struct old_sigaction __user *,act,
163                 struct old_sigaction __user *,oact)
164 {
165         WARN_ON_ONCE(sig >= 0);
166         return sys_sigaction(-sig, act, oact);
167 }
168 
169 SYSCALL_DEFINE5(rt_sigaction, int, sig,
170                  const struct sigaction __user *, act,
171                  struct sigaction __user *, oact,
172                  void __user *, restorer,
173                  size_t, sigsetsize)
174 {
175         struct k_sigaction new_ka, old_ka;
176         int ret;
177 
178         /* XXX: Don't preclude handling different sized sigset_t's.  */
179         if (sigsetsize != sizeof(sigset_t))
180                 return -EINVAL;
181 
182         if (act) {
183                 new_ka.ka_restorer = restorer;
184                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
185                         return -EFAULT;
186         }
187 
188         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
189 
190         if (!ret && oact) {
191                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
192                         return -EFAULT;
193         }
194 
195         return ret;
196 }
197 
198 SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
199 {
200         int nlen, err;
201         char tmp[__NEW_UTS_LEN + 1];
202 
203         if (len < 0)
204                 return -EINVAL;
205 
206         down_read(&uts_sem);
207 
208         nlen = strlen(utsname()->domainname) + 1;
209         err = -EINVAL;
210         if (nlen > len)
211                 goto out_unlock;
212         memcpy(tmp, utsname()->domainname, nlen);
213 
214         up_read(&uts_sem);
215 
216         if (copy_to_user(name, tmp, nlen))
217                 return -EFAULT;
218         return 0;
219 
220 out_unlock:
221         up_read(&uts_sem);
222         return err;
223 }
224 

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