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Linux/arch/powerpc/kernel/syscalls.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  *  Implementation of various system calls for Linux/PowerPC
  4  *
  5  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
  6  *
  7  * Derived from "arch/i386/kernel/sys_i386.c"
  8  * Adapted from the i386 version by Gary Thomas
  9  * Modified by Cort Dougan (cort@cs.nmt.edu)
 10  * and Paul Mackerras (paulus@cs.anu.edu.au).
 11  *
 12  * This file contains various random system calls that
 13  * have a non-standard calling sequence on the Linux/PPC
 14  * platform.
 15  */
 16 
 17 #include <linux/errno.h>
 18 #include <linux/sched.h>
 19 #include <linux/syscalls.h>
 20 #include <linux/mm.h>
 21 #include <linux/fs.h>
 22 #include <linux/smp.h>
 23 #include <linux/sem.h>
 24 #include <linux/msg.h>
 25 #include <linux/shm.h>
 26 #include <linux/stat.h>
 27 #include <linux/mman.h>
 28 #include <linux/sys.h>
 29 #include <linux/ipc.h>
 30 #include <linux/utsname.h>
 31 #include <linux/file.h>
 32 #include <linux/personality.h>
 33 
 34 #include <linux/uaccess.h>
 35 #include <asm/syscalls.h>
 36 #include <asm/time.h>
 37 #include <asm/unistd.h>
 38 #include <asm/asm-prototypes.h>
 39 
 40 static inline long do_mmap2(unsigned long addr, size_t len,
 41                         unsigned long prot, unsigned long flags,
 42                         unsigned long fd, unsigned long off, int shift)
 43 {
 44         long ret = -EINVAL;
 45 
 46         if (!arch_validate_prot(prot, addr))
 47                 goto out;
 48 
 49         if (shift) {
 50                 if (off & ((1 << shift) - 1))
 51                         goto out;
 52                 off >>= shift;
 53         }
 54 
 55         ret = ksys_mmap_pgoff(addr, len, prot, flags, fd, off);
 56 out:
 57         return ret;
 58 }
 59 
 60 SYSCALL_DEFINE6(mmap2, unsigned long, addr, size_t, len,
 61                 unsigned long, prot, unsigned long, flags,
 62                 unsigned long, fd, unsigned long, pgoff)
 63 {
 64         return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
 65 }
 66 
 67 SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len,
 68                 unsigned long, prot, unsigned long, flags,
 69                 unsigned long, fd, off_t, offset)
 70 {
 71         return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
 72 }
 73 
 74 #ifdef CONFIG_PPC32
 75 /*
 76  * Due to some executables calling the wrong select we sometimes
 77  * get wrong args.  This determines how the args are being passed
 78  * (a single ptr to them all args passed) then calls
 79  * sys_select() with the appropriate args. -- Cort
 80  */
 81 int
 82 ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct __kernel_old_timeval __user *tvp)
 83 {
 84         if ( (unsigned long)n >= 4096 )
 85         {
 86                 unsigned long __user *buffer = (unsigned long __user *)n;
 87                 if (!access_ok(buffer, 5*sizeof(unsigned long))
 88                     || __get_user(n, buffer)
 89                     || __get_user(inp, ((fd_set __user * __user *)(buffer+1)))
 90                     || __get_user(outp, ((fd_set  __user * __user *)(buffer+2)))
 91                     || __get_user(exp, ((fd_set  __user * __user *)(buffer+3)))
 92                     || __get_user(tvp, ((struct __kernel_old_timeval  __user * __user *)(buffer+4))))
 93                         return -EFAULT;
 94         }
 95         return sys_select(n, inp, outp, exp, tvp);
 96 }
 97 #endif
 98 
 99 #ifdef CONFIG_PPC64
100 long ppc64_personality(unsigned long personality)
101 {
102         long ret;
103 
104         if (personality(current->personality) == PER_LINUX32
105             && personality(personality) == PER_LINUX)
106                 personality = (personality & ~PER_MASK) | PER_LINUX32;
107         ret = sys_personality(personality);
108         if (personality(ret) == PER_LINUX32)
109                 ret = (ret & ~PER_MASK) | PER_LINUX;
110         return ret;
111 }
112 #endif
113 
114 long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,
115                       u32 len_high, u32 len_low)
116 {
117         return ksys_fadvise64_64(fd, (u64)offset_high << 32 | offset_low,
118                                  (u64)len_high << 32 | len_low, advice);
119 }
120 
121 SYSCALL_DEFINE0(switch_endian)
122 {
123         struct thread_info *ti;
124 
125         current->thread.regs->msr ^= MSR_LE;
126 
127         /*
128          * Set TIF_RESTOREALL so that r3 isn't clobbered on return to
129          * userspace. That also has the effect of restoring the non-volatile
130          * GPRs, so we saved them on the way in here.
131          */
132         ti = current_thread_info();
133         ti->flags |= _TIF_RESTOREALL;
134 
135         return 0;
136 }
137 

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