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/* 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 */
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