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