arch/c6x/kernel/sys_c6x.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Port on Texas Instruments TMS320C6x architecture
   4  *
   5  *  Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
   6  *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
   7  */
   8 #include <linux/module.h>
   9 #include <linux/syscalls.h>
  10 #include <linux/uaccess.h>
  11
  12 #include <asm/syscalls.h>
  13
  14 #ifdef CONFIG_ACCESS_CHECK
  15 int _access_ok(unsigned long addr, unsigned long size)
  16 {
  17         if (!size)
  18                 return 1;
  19
  20         if (!addr || addr > (0xffffffffUL - (size - 1)))
  21                 goto _bad_access;
  22
  23         if (uaccess_kernel())
  24                 return 1;
  25
  26         if (memory_start <= addr && (addr + size - 1) < memory_end)
  27                 return 1;
  28
  29 _bad_access:
  30         pr_debug("Bad access attempt: pid[%d] addr[%08lx] size[0x%lx]\n",
  31                  current->pid, addr, size);
  32         return 0;
  33 }
  34 EXPORT_SYMBOL(_access_ok);
  35 #endif
  36
  37 /* sys_cache_sync -- sync caches over given range */
  38 asmlinkage int sys_cache_sync(unsigned long s, unsigned long e)
  39 {
  40         L1D_cache_block_writeback_invalidate(s, e);
  41         L1P_cache_block_invalidate(s, e);
  42
  43         return 0;
  44 }
  45
  46 /* Provide the actual syscall number to call mapping. */
  47 #undef __SYSCALL
  48 #define __SYSCALL(nr, call) [nr] = (call),
  49
  50 /*
  51  * Use trampolines
  52  */
  53 #define sys_pread64             sys_pread_c6x
  54 #define sys_pwrite64            sys_pwrite_c6x
  55 #define sys_truncate64          sys_truncate64_c6x
  56 #define sys_ftruncate64         sys_ftruncate64_c6x
  57 #define sys_fadvise64           sys_fadvise64_c6x
  58 #define sys_fadvise64_64        sys_fadvise64_64_c6x
  59 #define sys_fallocate           sys_fallocate_c6x
  60
  61 /* Use sys_mmap_pgoff directly */
  62 #define sys_mmap2 sys_mmap_pgoff
  63
  64 /*
  65  * Note that we can't include <linux/unistd.h> here since the header
  66  * guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well.
  67  */
  68 void *sys_call_table[__NR_syscalls] = {
  69         [0 ... __NR_syscalls-1] = sys_ni_syscall,
  70 #include <asm/unistd.h>
  71 };