1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/arch/sh/kernel/sys_sh.c 4 * 5 * This file contains various random system calls that 6 * have a non-standard calling sequence on the Linux/SuperH 7 * platform. 8 * 9 * Taken from i386 version. 10 */ 11 #include <linux/errno.h> 12 #include <linux/sched.h> 13 #include <linux/mm.h> 14 #include <linux/smp.h> 15 #include <linux/sem.h> 16 #include <linux/msg.h> 17 #include <linux/shm.h> 18 #include <linux/stat.h> 19 #include <linux/syscalls.h> 20 #include <linux/mman.h> 21 #include <linux/file.h> 22 #include <linux/utsname.h> 23 #include <linux/module.h> 24 #include <linux/fs.h> 25 #include <linux/ipc.h> 26 #include <asm/syscalls.h> 27 #include <linux/uaccess.h> 28 #include <asm/unistd.h> 29 #include <asm/cacheflush.h> 30 #include <asm/cachectl.h> 31 32 asmlinkage int old_mmap(unsigned long addr, unsigned long len, 33 unsigned long prot, unsigned long flags, 34 int fd, unsigned long off) 35 { 36 if (off & ~PAGE_MASK) 37 return -EINVAL; 38 return ksys_mmap_pgoff(addr, len, prot, flags, fd, off>>PAGE_SHIFT); 39 } 40 41 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len, 42 unsigned long prot, unsigned long flags, 43 unsigned long fd, unsigned long pgoff) 44 { 45 /* 46 * The shift for mmap2 is constant, regardless of PAGE_SIZE 47 * setting. 48 */ 49 if (pgoff & ((1 << (PAGE_SHIFT - 12)) - 1)) 50 return -EINVAL; 51 52 pgoff >>= PAGE_SHIFT - 12; 53 54 return ksys_mmap_pgoff(addr, len, prot, flags, fd, pgoff); 55 } 56 57 /* sys_cacheflush -- flush (part of) the processor cache. */ 58 asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len, int op) 59 { 60 struct vm_area_struct *vma; 61 62 if ((op <= 0) || (op > (CACHEFLUSH_D_PURGE|CACHEFLUSH_I))) 63 return -EINVAL; 64 65 /* 66 * Verify that the specified address region actually belongs 67 * to this process. 68 */ 69 if (addr + len < addr) 70 return -EFAULT; 71 72 down_read(¤t->mm->mmap_sem); 73 vma = find_vma (current->mm, addr); 74 if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end) { 75 up_read(¤t->mm->mmap_sem); 76 return -EFAULT; 77 } 78 79 switch (op & CACHEFLUSH_D_PURGE) { 80 case CACHEFLUSH_D_INVAL: 81 __flush_invalidate_region((void *)addr, len); 82 break; 83 case CACHEFLUSH_D_WB: 84 __flush_wback_region((void *)addr, len); 85 break; 86 case CACHEFLUSH_D_PURGE: 87 __flush_purge_region((void *)addr, len); 88 break; 89 } 90 91 if (op & CACHEFLUSH_I) 92 flush_icache_range(addr, addr+len); 93 94 up_read(¤t->mm->mmap_sem); 95 return 0; 96 } 97