cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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sys_sh.c (2341B)

      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
     32asmlinkage 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
     41asmlinkage 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.  */
     58asmlinkage 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	mmap_read_lock(current->mm);
     73	vma = find_vma (current->mm, addr);
     74	if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end) {
     75		mmap_read_unlock(current->mm);
     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	mmap_read_unlock(current->mm);
     95	return 0;
     96}