blob: 8b8bbd3eaa52cc8df71d66ab1063427232319692 [file] [log] [blame]
* Based on arch/arm/kernel/sys_arm.c
* Copyright (C) People who wrote linux/arch/i386/kernel/sys_i386.c
* Copyright (C) 1995, 1996 Russell King.
* Copyright (C) 2012 ARM Ltd.
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <>.
#include <linux/compat.h>
#include <linux/personality.h>
#include <linux/sched.h>
#include <linux/sched/signal.h>
#include <linux/slab.h>
#include <linux/syscalls.h>
#include <linux/uaccess.h>
#include <asm/cacheflush.h>
#include <asm/unistd.h>
static long
__do_compat_cache_op(unsigned long start, unsigned long end)
long ret;
do {
unsigned long chunk = min(PAGE_SIZE, end - start);
if (fatal_signal_pending(current))
return 0;
ret = __flush_cache_user_range(start, start + chunk);
if (ret)
return ret;
start += chunk;
} while (start < end);
return 0;
static inline long
do_compat_cache_op(unsigned long start, unsigned long end, int flags)
if (end < start || flags)
return -EINVAL;
if (!access_ok(VERIFY_READ, start, end - start))
return -EFAULT;
return __do_compat_cache_op(start, end);
* Handle all unrecognised system calls.
long compat_arm_syscall(struct pt_regs *regs)
unsigned int no = regs->regs[7];
switch (no) {
* Flush a region from virtual address 'r0' to virtual address 'r1'
* _exclusive_. There is no alignment requirement on either address;
* user space does not need to know the hardware cache layout.
* r2 contains flags. It should ALWAYS be passed as ZERO until it
* is defined to be something else. For now we ignore it, but may
* the fires of hell burn in your belly if you break this rule. ;)
* (at a later date, we may want to allow this call to not flush
* various aspects of the cache. Passing '0' will guarantee that
* everything necessary gets flushed to maintain consistency in
* the specified region).
case __ARM_NR_compat_cacheflush:
return do_compat_cache_op(regs->regs[0], regs->regs[1], regs->regs[2]);
case __ARM_NR_compat_set_tls:
current->thread.tp_value = regs->regs[0];
* Protect against register corruption from context switch.
* See comment in tls_thread_flush.
write_sysreg(regs->regs[0], tpidrro_el0);
return 0;
return -ENOSYS;