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| 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
|---|---|
| 2 | #ifndef _ASM_POWERPC_INST_H |
| 3 | #define _ASM_POWERPC_INST_H |
| 4 | |
| 5 | #include <asm/ppc-opcode.h> |
| 6 | #include <asm/reg.h> |
| 7 | #include <asm/disassemble.h> |
| 8 | #include <asm/uaccess.h> |
| 9 | |
| 10 | #define ___get_user_instr(gu_op, dest, ptr) \ |
| 11 | ({ \ |
| 12 | long __gui_ret; \ |
| 13 | u32 __user *__gui_ptr = (u32 __user *)ptr; \ |
| 14 | ppc_inst_t __gui_inst; \ |
| 15 | unsigned int __prefix, __suffix; \ |
| 16 | \ |
| 17 | __chk_user_ptr(ptr); \ |
| 18 | __gui_ret = gu_op(__prefix, __gui_ptr); \ |
| 19 | if (__gui_ret == 0) { \ |
| 20 | if (IS_ENABLED(CONFIG_PPC64) && (__prefix >> 26) == OP_PREFIX) { \ |
| 21 | __gui_ret = gu_op(__suffix, __gui_ptr + 1); \ |
| 22 | __gui_inst = ppc_inst_prefix(__prefix, __suffix); \ |
| 23 | } else { \ |
| 24 | __gui_inst = ppc_inst(__prefix); \ |
| 25 | } \ |
| 26 | if (__gui_ret == 0) \ |
| 27 | (dest) = __gui_inst; \ |
| 28 | } \ |
| 29 | __gui_ret; \ |
| 30 | }) |
| 31 | |
| 32 | #define get_user_instr(x, ptr) ___get_user_instr(get_user, x, ptr) |
| 33 | |
| 34 | #define __get_user_instr(x, ptr) ___get_user_instr(__get_user, x, ptr) |
| 35 | |
| 36 | /* |
| 37 | * Instruction data type for POWER |
| 38 | */ |
| 39 | |
| 40 | #if defined(CONFIG_PPC64) || defined(__CHECKER__) |
| 41 | static inline u32 ppc_inst_val(ppc_inst_t x) |
| 42 | { |
| 43 | return x.val; |
| 44 | } |
| 45 | |
| 46 | #define ppc_inst(x) ((ppc_inst_t){ .val = (x) }) |
| 47 | |
| 48 | #else |
| 49 | static inline u32 ppc_inst_val(ppc_inst_t x) |
| 50 | { |
| 51 | return x; |
| 52 | } |
| 53 | #define ppc_inst(x) (x) |
| 54 | #endif |
| 55 | |
| 56 | static inline int ppc_inst_primary_opcode(ppc_inst_t x) |
| 57 | { |
| 58 | return ppc_inst_val(x) >> 26; |
| 59 | } |
| 60 | |
| 61 | #ifdef CONFIG_PPC64 |
| 62 | #define ppc_inst_prefix(x, y) ((ppc_inst_t){ .val = (x), .suffix = (y) }) |
| 63 | |
| 64 | static inline u32 ppc_inst_suffix(ppc_inst_t x) |
| 65 | { |
| 66 | return x.suffix; |
| 67 | } |
| 68 | |
| 69 | #else |
| 70 | #define ppc_inst_prefix(x, y) ((void)y, ppc_inst(x)) |
| 71 | |
| 72 | static inline u32 ppc_inst_suffix(ppc_inst_t x) |
| 73 | { |
| 74 | return 0; |
| 75 | } |
| 76 | |
| 77 | #endif /* CONFIG_PPC64 */ |
| 78 | |
| 79 | static inline ppc_inst_t ppc_inst_read(const u32 *ptr) |
| 80 | { |
| 81 | if (IS_ENABLED(CONFIG_PPC64) && (*ptr >> 26) == OP_PREFIX) |
| 82 | return ppc_inst_prefix(*ptr, *(ptr + 1)); |
| 83 | else |
| 84 | return ppc_inst(*ptr); |
| 85 | } |
| 86 | |
| 87 | static inline bool ppc_inst_prefixed(ppc_inst_t x) |
| 88 | { |
| 89 | return IS_ENABLED(CONFIG_PPC64) && ppc_inst_primary_opcode(x) == OP_PREFIX; |
| 90 | } |
| 91 | |
| 92 | static inline ppc_inst_t ppc_inst_swab(ppc_inst_t x) |
| 93 | { |
| 94 | return ppc_inst_prefix(swab32(ppc_inst_val(x)), swab32(ppc_inst_suffix(x))); |
| 95 | } |
| 96 | |
| 97 | static inline bool ppc_inst_equal(ppc_inst_t x, ppc_inst_t y) |
| 98 | { |
| 99 | if (ppc_inst_val(x) != ppc_inst_val(y)) |
| 100 | return false; |
| 101 | if (!ppc_inst_prefixed(x)) |
| 102 | return true; |
| 103 | return ppc_inst_suffix(x) == ppc_inst_suffix(y); |
| 104 | } |
| 105 | |
| 106 | static inline int ppc_inst_len(ppc_inst_t x) |
| 107 | { |
| 108 | return ppc_inst_prefixed(x) ? 8 : 4; |
| 109 | } |
| 110 | |
| 111 | /* |
| 112 | * Return the address of the next instruction, if the instruction @value was |
| 113 | * located at @location. |
| 114 | */ |
| 115 | static inline u32 *ppc_inst_next(u32 *location, u32 *value) |
| 116 | { |
| 117 | ppc_inst_t tmp; |
| 118 | |
| 119 | tmp = ppc_inst_read(value); |
| 120 | |
| 121 | return (void *)location + ppc_inst_len(tmp); |
| 122 | } |
| 123 | |
| 124 | static inline unsigned long ppc_inst_as_ulong(ppc_inst_t x) |
| 125 | { |
| 126 | if (IS_ENABLED(CONFIG_PPC32)) |
| 127 | return ppc_inst_val(x); |
| 128 | else if (IS_ENABLED(CONFIG_CPU_LITTLE_ENDIAN)) |
| 129 | return (u64)ppc_inst_suffix(x) << 32 | ppc_inst_val(x); |
| 130 | else |
| 131 | return (u64)ppc_inst_val(x) << 32 | ppc_inst_suffix(x); |
| 132 | } |
| 133 | |
| 134 | static inline void ppc_inst_write(u32 *ptr, ppc_inst_t x) |
| 135 | { |
| 136 | if (!ppc_inst_prefixed(x)) |
| 137 | *ptr = ppc_inst_val(x); |
| 138 | else |
| 139 | *(u64 *)ptr = ppc_inst_as_ulong(x); |
| 140 | } |
| 141 | |
| 142 | static inline int __copy_inst_from_kernel_nofault(ppc_inst_t *inst, u32 *src) |
| 143 | { |
| 144 | unsigned int val, suffix; |
| 145 | |
| 146 | __get_kernel_nofault(&val, src, u32, Efault); |
| 147 | if (IS_ENABLED(CONFIG_PPC64) && get_op(val) == OP_PREFIX) { |
| 148 | __get_kernel_nofault(&suffix, src + 1, u32, Efault); |
| 149 | *inst = ppc_inst_prefix(val, suffix); |
| 150 | } else { |
| 151 | *inst = ppc_inst(val); |
| 152 | } |
| 153 | return 0; |
| 154 | Efault: |
| 155 | return -EFAULT; |
| 156 | } |
| 157 | |
| 158 | static inline int copy_inst_from_kernel_nofault(ppc_inst_t *inst, u32 *src) |
| 159 | { |
| 160 | if (unlikely(!is_kernel_addr((unsigned long)src))) |
| 161 | return -ERANGE; |
| 162 | |
| 163 | return __copy_inst_from_kernel_nofault(inst, src); |
| 164 | } |
| 165 | |
| 166 | #endif /* _ASM_POWERPC_INST_H */ |
| 167 |
Warning: This file is not a C or C++ file. It does not have highlighting.