diff options
Diffstat (limited to 'arch/powerpc/lib/inst.c')
| -rw-r--r-- | arch/powerpc/lib/inst.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/arch/powerpc/lib/inst.c b/arch/powerpc/lib/inst.c new file mode 100644 index 000000000000..9cc17eb62462 --- /dev/null +++ b/arch/powerpc/lib/inst.c @@ -0,0 +1,73 @@ +// 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 */ |