diff options
Diffstat (limited to 'arch/powerpc/mm/maccess.c')
-rw-r--r-- | arch/powerpc/mm/maccess.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/powerpc/mm/maccess.c b/arch/powerpc/mm/maccess.c index fa9a7a718fc6..a3c30a884076 100644 --- a/arch/powerpc/mm/maccess.c +++ b/arch/powerpc/mm/maccess.c @@ -3,7 +3,28 @@ #include <linux/uaccess.h> #include <linux/kernel.h> +#include <asm/disassemble.h> +#include <asm/inst.h> +#include <asm/ppc-opcode.h> + bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size) { return is_kernel_addr((unsigned long)unsafe_src); } + +int copy_inst_from_kernel_nofault(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 (IS_ENABLED(CONFIG_PPC64) && 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; +} |