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