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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright 2020, IBM Corporation.
*/
#include <linux/uaccess.h>
#include <asm/disassemble.h>
#include <asm/inst.h>
#include <asm/ppc-opcode.h>
#ifdef CONFIG_PPC64
int probe_user_read_inst(struct ppc_inst *inst,
struct ppc_inst __user *nip)
{
unsigned int val, suffix;
int err;
err = copy_from_user_nofault(&val, nip, sizeof(val));
if (err)
return err;
if (get_op(val) == OP_PREFIX) {
err = copy_from_user_nofault(&suffix, (void __user *)nip + 4, 4);
*inst = ppc_inst_prefix(val, suffix);
} else {
*inst = ppc_inst(val);
}
return err;
}
int probe_kernel_read_inst(struct ppc_inst *inst,
struct ppc_inst *src)
{
unsigned int val, suffix;
int err;
err = copy_from_kernel_nofault(&val, src, sizeof(val));
if (err)
return err;
if (get_op(val) == OP_PREFIX) {
err = copy_from_kernel_nofault(&suffix, (void *)src + 4, 4);
*inst = ppc_inst_prefix(val, suffix);
} else {
*inst = ppc_inst(val);
}
return err;
}
#else /* !CONFIG_PPC64 */
int probe_user_read_inst(struct ppc_inst *inst,
struct ppc_inst __user *nip)
{
unsigned int val;
int err;
err = copy_from_user_nofault(&val, nip, sizeof(val));
if (!err)
*inst = ppc_inst(val);
return err;
}
int probe_kernel_read_inst(struct ppc_inst *inst,
struct ppc_inst *src)
{
unsigned int val;
int err;
err = copy_from_kernel_nofault(&val, src, sizeof(val));
if (!err)
*inst = ppc_inst(val);
return err;
}
#endif /* CONFIG_PPC64 */
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