arch/powerpc/include/asm/inst.h

   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
   7 /*
   8  * Instruction data type for POWER
   9  */
  10
  11 struct ppc_inst {
  12         u32 val;
  13 #ifdef CONFIG_PPC64
  14         u32 suffix;
  15 #endif
  16 } __packed;
  17
  18 static inline u32 ppc_inst_val(struct ppc_inst x)
  19 {
  20         return x.val;
  21 }
  22
  23 static inline int ppc_inst_primary_opcode(struct ppc_inst x)
  24 {
  25         return ppc_inst_val(x) >> 26;
  26 }
  27
  28 #ifdef CONFIG_PPC64
  29 #define ppc_inst(x) ((struct ppc_inst){ .val = (x), .suffix = 0xff })
  30
  31 #define ppc_inst_prefix(x, y) ((struct ppc_inst){ .val = (x), .suffix = (y) })
  32
  33 static inline u32 ppc_inst_suffix(struct ppc_inst x)
  34 {
  35         return x.suffix;
  36 }
  37
  38 static inline bool ppc_inst_prefixed(struct ppc_inst x)
  39 {
  40         return (ppc_inst_primary_opcode(x) == 1) && ppc_inst_suffix(x) != 0xff;
  41 }
  42
  43 static inline struct ppc_inst ppc_inst_swab(struct ppc_inst x)
  44 {
  45         return ppc_inst_prefix(swab32(ppc_inst_val(x)),
  46                                swab32(ppc_inst_suffix(x)));
  47 }
  48
  49 static inline struct ppc_inst ppc_inst_read(const struct ppc_inst *ptr)
  50 {
  51         u32 val, suffix;
  52
  53         val = *(u32 *)ptr;
  54         if ((val >> 26) == OP_PREFIX) {
  55                 suffix = *((u32 *)ptr + 1);
  56                 return ppc_inst_prefix(val, suffix);
  57         } else {
  58                 return ppc_inst(val);
  59         }
  60 }
  61
  62 static inline bool ppc_inst_equal(struct ppc_inst x, struct ppc_inst y)
  63 {
  64         return *(u64 *)&x == *(u64 *)&y;
  65 }
  66
  67 #else
  68
  69 #define ppc_inst(x) ((struct ppc_inst){ .val = x })
  70
  71 static inline bool ppc_inst_prefixed(struct ppc_inst x)
  72 {
  73         return false;
  74 }
  75
  76 static inline u32 ppc_inst_suffix(struct ppc_inst x)
  77 {
  78         return 0;
  79 }
  80
  81 static inline struct ppc_inst ppc_inst_swab(struct ppc_inst x)
  82 {
  83         return ppc_inst(swab32(ppc_inst_val(x)));
  84 }
  85
  86 static inline struct ppc_inst ppc_inst_read(const struct ppc_inst *ptr)
  87 {
  88         return *ptr;
  89 }
  90
  91 static inline bool ppc_inst_equal(struct ppc_inst x, struct ppc_inst y)
  92 {
  93         return ppc_inst_val(x) == ppc_inst_val(y);
  94 }
  95
  96 #endif /* CONFIG_PPC64 */
  97
  98 static inline int ppc_inst_len(struct ppc_inst x)
  99 {
 100         return ppc_inst_prefixed(x) ? 8 : 4;
 101 }
 102
 103 /*
 104  * Return the address of the next instruction, if the instruction @value was
 105  * located at @location.
 106  */
 107 static inline struct ppc_inst *ppc_inst_next(void *location, struct ppc_inst *value)
 108 {
 109         struct ppc_inst tmp;
 110
 111         tmp = ppc_inst_read(value);
 112
 113         return location + ppc_inst_len(tmp);
 114 }
 115
 116 static inline u64 ppc_inst_as_u64(struct ppc_inst x)
 117 {
 118 #ifdef CONFIG_CPU_LITTLE_ENDIAN
 119         return (u64)ppc_inst_suffix(x) << 32 | ppc_inst_val(x);
 120 #else
 121         return (u64)ppc_inst_val(x) << 32 | ppc_inst_suffix(x);
 122 #endif
 123 }
 124
 125 #define PPC_INST_STR_LEN sizeof("00000000 00000000")
 126
 127 static inline char *__ppc_inst_as_str(char str[PPC_INST_STR_LEN], struct ppc_inst x)
 128 {
 129         if (ppc_inst_prefixed(x))
 130                 sprintf(str, "%08x %08x", ppc_inst_val(x), ppc_inst_suffix(x));
 131         else
 132                 sprintf(str, "%08x", ppc_inst_val(x));
 133
 134         return str;
 135 }
 136
 137 #define ppc_inst_as_str(x)              \
 138 ({                                      \
 139         char __str[PPC_INST_STR_LEN];   \
 140         __ppc_inst_as_str(__str, x);    \
 141         __str;                          \
 142 })
 143
 144 int probe_user_read_inst(struct ppc_inst *inst,
 145                          struct ppc_inst __user *nip);
 146
 147 int probe_kernel_read_inst(struct ppc_inst *inst,
 148                            struct ppc_inst *src);
 149
 150 #endif /* _ASM_POWERPC_INST_H */