diff options
Diffstat (limited to 'arch/powerpc/include/asm/inst.h')
| -rw-r--r-- | arch/powerpc/include/asm/inst.h | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/inst.h b/arch/powerpc/include/asm/inst.h new file mode 100644 index 000000000..684d3f453 --- /dev/null +++ b/arch/powerpc/include/asm/inst.h @@ -0,0 +1,170 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef _ASM_POWERPC_INST_H +#define _ASM_POWERPC_INST_H + +#include <asm/ppc-opcode.h> +#include <asm/reg.h> +#include <asm/disassemble.h> +#include <asm/uaccess.h> + +#define ___get_user_instr(gu_op, dest, ptr) \ +({ \ + long __gui_ret; \ + u32 __user *__gui_ptr = (u32 __user *)ptr; \ + ppc_inst_t __gui_inst; \ + unsigned int __prefix, __suffix; \ + \ + __chk_user_ptr(ptr); \ + __gui_ret = gu_op(__prefix, __gui_ptr); \ + if (__gui_ret == 0) { \ + if (IS_ENABLED(CONFIG_PPC64) && (__prefix >> 26) == OP_PREFIX) { \ + __gui_ret = gu_op(__suffix, __gui_ptr + 1); \ + __gui_inst = ppc_inst_prefix(__prefix, __suffix); \ + } else { \ + __gui_inst = ppc_inst(__prefix); \ + } \ + if (__gui_ret == 0) \ + (dest) = __gui_inst; \ + } \ + __gui_ret; \ +}) + +#define get_user_instr(x, ptr) ___get_user_instr(get_user, x, ptr) + +#define __get_user_instr(x, ptr) ___get_user_instr(__get_user, x, ptr) + +/* + * Instruction data type for POWER + */ + +#if defined(CONFIG_PPC64) || defined(__CHECKER__) +static inline u32 ppc_inst_val(ppc_inst_t x) +{ + return x.val; +} + +#define ppc_inst(x) ((ppc_inst_t){ .val = (x) }) + +#else +static inline u32 ppc_inst_val(ppc_inst_t x) +{ + return x; +} +#define ppc_inst(x) (x) +#endif + +static inline int ppc_inst_primary_opcode(ppc_inst_t x) +{ + return ppc_inst_val(x) >> 26; +} + +#ifdef CONFIG_PPC64 +#define ppc_inst_prefix(x, y) ((ppc_inst_t){ .val = (x), .suffix = (y) }) + +static inline u32 ppc_inst_suffix(ppc_inst_t x) +{ + return x.suffix; +} + +#else +#define ppc_inst_prefix(x, y) ((void)y, ppc_inst(x)) + +static inline u32 ppc_inst_suffix(ppc_inst_t x) +{ + return 0; +} + +#endif /* CONFIG_PPC64 */ + +static inline ppc_inst_t ppc_inst_read(const u32 *ptr) +{ + if (IS_ENABLED(CONFIG_PPC64) && (*ptr >> 26) == OP_PREFIX) + return ppc_inst_prefix(*ptr, *(ptr + 1)); + else + return ppc_inst(*ptr); +} + +static inline bool ppc_inst_prefixed(ppc_inst_t x) +{ + return IS_ENABLED(CONFIG_PPC64) && ppc_inst_primary_opcode(x) == OP_PREFIX; +} + +static inline ppc_inst_t ppc_inst_swab(ppc_inst_t x) +{ + return ppc_inst_prefix(swab32(ppc_inst_val(x)), swab32(ppc_inst_suffix(x))); +} + +static inline bool ppc_inst_equal(ppc_inst_t x, ppc_inst_t y) +{ + if (ppc_inst_val(x) != ppc_inst_val(y)) + return false; + if (!ppc_inst_prefixed(x)) + return true; + return ppc_inst_suffix(x) == ppc_inst_suffix(y); +} + +static inline int ppc_inst_len(ppc_inst_t x) +{ + return ppc_inst_prefixed(x) ? 8 : 4; +} + +/* + * Return the address of the next instruction, if the instruction @value was + * located at @location. + */ +static inline u32 *ppc_inst_next(u32 *location, u32 *value) +{ + ppc_inst_t tmp; + + tmp = ppc_inst_read(value); + + return (void *)location + ppc_inst_len(tmp); +} + +static inline unsigned long ppc_inst_as_ulong(ppc_inst_t x) +{ + if (IS_ENABLED(CONFIG_PPC32)) + return ppc_inst_val(x); + else if (IS_ENABLED(CONFIG_CPU_LITTLE_ENDIAN)) + return (u64)ppc_inst_suffix(x) << 32 | ppc_inst_val(x); + else + return (u64)ppc_inst_val(x) << 32 | ppc_inst_suffix(x); +} + +static inline void ppc_inst_write(u32 *ptr, ppc_inst_t x) +{ + if (!ppc_inst_prefixed(x)) + *ptr = ppc_inst_val(x); + else + *(u64 *)ptr = ppc_inst_as_ulong(x); +} + +static inline int __copy_inst_from_kernel_nofault(ppc_inst_t *inst, u32 *src) +{ + unsigned int val, suffix; + +/* See https://github.com/ClangBuiltLinux/linux/issues/1521 */ +#if defined(CONFIG_CC_IS_CLANG) && CONFIG_CLANG_VERSION < 140000 + val = suffix = 0; +#endif + __get_kernel_nofault(&val, src, u32, Efault); + if (IS_ENABLED(CONFIG_PPC64) && get_op(val) == OP_PREFIX) { + __get_kernel_nofault(&suffix, src + 1, u32, Efault); + *inst = ppc_inst_prefix(val, suffix); + } else { + *inst = ppc_inst(val); + } + return 0; +Efault: + return -EFAULT; +} + +static inline int copy_inst_from_kernel_nofault(ppc_inst_t *inst, u32 *src) +{ + if (unlikely(!is_kernel_addr((unsigned long)src))) + return -ERANGE; + + return __copy_inst_from_kernel_nofault(inst, src); +} + +#endif /* _ASM_POWERPC_INST_H */ |