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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2004 Paul Mackerras <paulus@au.ibm.com>, IBM | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | */ | |
9 | ||
10 | struct pt_regs; | |
11 | ||
12 | /* | |
13 | * We don't allow single-stepping an mtmsrd that would clear | |
14 | * MSR_RI, since that would make the exception unrecoverable. | |
15 | * Since we need to single-step to proceed from a breakpoint, | |
16 | * we don't allow putting a breakpoint on an mtmsrd instruction. | |
17 | * Similarly we don't allow breakpoints on rfid instructions. | |
18 | * These macros tell us if an instruction is a mtmsrd or rfid. | |
c032524f PM |
19 | * Note that IS_MTMSRD returns true for both an mtmsr (32-bit) |
20 | * and an mtmsrd (64-bit). | |
1da177e4 | 21 | */ |
c032524f | 22 | #define IS_MTMSRD(instr) (((instr) & 0xfc0007be) == 0x7c000124) |
1da177e4 | 23 | #define IS_RFID(instr) (((instr) & 0xfc0007fe) == 0x4c000024) |
82090035 | 24 | #define IS_RFI(instr) (((instr) & 0xfc0007fe) == 0x4c000064) |
1da177e4 | 25 | |
be96f633 PM |
26 | enum instruction_type { |
27 | COMPUTE, /* arith/logical/CR op, etc. */ | |
d120cdbc | 28 | LOAD, /* load and store types need to be contiguous */ |
be96f633 PM |
29 | LOAD_MULTI, |
30 | LOAD_FP, | |
31 | LOAD_VMX, | |
32 | LOAD_VSX, | |
33 | STORE, | |
34 | STORE_MULTI, | |
35 | STORE_FP, | |
36 | STORE_VMX, | |
37 | STORE_VSX, | |
38 | LARX, | |
39 | STCX, | |
40 | BRANCH, | |
41 | MFSPR, | |
42 | MTSPR, | |
43 | CACHEOP, | |
44 | BARRIER, | |
45 | SYSCALL, | |
46 | MFMSR, | |
47 | MTMSR, | |
48 | RFI, | |
49 | INTERRUPT, | |
50 | UNKNOWN | |
51 | }; | |
52 | ||
53 | #define INSTR_TYPE_MASK 0x1f | |
54 | ||
d120cdbc PM |
55 | #define OP_IS_LOAD_STORE(type) (LOAD <= (type) && (type) <= STCX) |
56 | ||
3cdfcbfd PM |
57 | /* Compute flags, ORed in with type */ |
58 | #define SETREG 0x20 | |
59 | #define SETCC 0x40 | |
60 | #define SETXER 0x80 | |
61 | ||
62 | /* Branch flags, ORed in with type */ | |
63 | #define SETLK 0x20 | |
64 | #define BRTAKEN 0x40 | |
65 | #define DECCTR 0x80 | |
66 | ||
be96f633 PM |
67 | /* Load/store flags, ORed in with type */ |
68 | #define SIGNEXT 0x20 | |
69 | #define UPDATE 0x40 /* matches bit in opcode 31 instructions */ | |
70 | #define BYTEREV 0x80 | |
71 | ||
3cdfcbfd PM |
72 | /* Barrier type field, ORed in with type */ |
73 | #define BARRIER_MASK 0xe0 | |
74 | #define BARRIER_SYNC 0x00 | |
75 | #define BARRIER_ISYNC 0x20 | |
76 | #define BARRIER_EIEIO 0x40 | |
77 | #define BARRIER_LWSYNC 0x60 | |
78 | #define BARRIER_PTESYNC 0x80 | |
79 | ||
be96f633 PM |
80 | /* Cacheop values, ORed in with type */ |
81 | #define CACHEOP_MASK 0x700 | |
82 | #define DCBST 0 | |
83 | #define DCBF 0x100 | |
84 | #define DCBTST 0x200 | |
85 | #define DCBT 0x300 | |
cf87c3f6 | 86 | #define ICBI 0x400 |
b2543f7b | 87 | #define DCBZ 0x500 |
be96f633 | 88 | |
350779a2 PM |
89 | /* VSX flags values */ |
90 | #define VSX_FPCONV 1 /* do floating point SP/DP conversion */ | |
91 | #define VSX_SPLAT 2 /* store loaded value into all elements */ | |
92 | #define VSX_LDLEFT 4 /* load VSX register from left */ | |
93 | #define VSX_CHECK_VEC 8 /* check MSR_VEC not MSR_VSX for reg >= 32 */ | |
94 | ||
be96f633 PM |
95 | /* Size field in type word */ |
96 | #define SIZE(n) ((n) << 8) | |
97 | #define GETSIZE(w) ((w) >> 8) | |
98 | ||
99 | #define MKOP(t, f, s) ((t) | (f) | SIZE(s)) | |
100 | ||
101 | struct instruction_op { | |
102 | int type; | |
103 | int reg; | |
104 | unsigned long val; | |
105 | /* For LOAD/STORE/LARX/STCX */ | |
106 | unsigned long ea; | |
107 | int update_reg; | |
108 | /* For MFSPR */ | |
109 | int spr; | |
3cdfcbfd PM |
110 | u32 ccval; |
111 | u32 xerval; | |
350779a2 PM |
112 | u8 element_size; /* for VSX/VMX loads/stores */ |
113 | u8 vsx_flags; | |
114 | }; | |
115 | ||
116 | union vsx_reg { | |
117 | u8 b[16]; | |
118 | u16 h[8]; | |
119 | u32 w[4]; | |
120 | unsigned long d[2]; | |
121 | float fp[4]; | |
122 | double dp[2]; | |
c22435a5 | 123 | __vector128 v; |
be96f633 PM |
124 | }; |
125 | ||
3cdfcbfd PM |
126 | /* |
127 | * Decode an instruction, and return information about it in *op | |
128 | * without changing *regs. | |
129 | * | |
130 | * Return value is 1 if the instruction can be emulated just by | |
131 | * updating *regs with the information in *op, -1 if we need the | |
132 | * GPRs but *regs doesn't contain the full register set, or 0 | |
133 | * otherwise. | |
134 | */ | |
135 | extern int analyse_instr(struct instruction_op *op, const struct pt_regs *regs, | |
be96f633 | 136 | unsigned int instr); |
3cdfcbfd PM |
137 | |
138 | /* | |
139 | * Emulate an instruction that can be executed just by updating | |
140 | * fields in *regs. | |
141 | */ | |
142 | void emulate_update_regs(struct pt_regs *reg, struct instruction_op *op); | |
143 | ||
144 | /* | |
145 | * Emulate instructions that cause a transfer of control, | |
146 | * arithmetic/logical instructions, loads and stores, | |
147 | * cache operations and barriers. | |
148 | * | |
149 | * Returns 1 if the instruction was emulated successfully, | |
150 | * 0 if it could not be emulated, or -1 for an instruction that | |
151 | * should not be emulated (rfid, mtmsrd clearing MSR_RI, etc.). | |
152 | */ | |
153 | extern int emulate_step(struct pt_regs *regs, unsigned int instr); | |
154 | ||
a53d5182 PM |
155 | /* |
156 | * Emulate a load or store instruction by reading/writing the | |
157 | * memory of the current process. FP/VMX/VSX registers are assumed | |
158 | * to hold live values if the appropriate enable bit in regs->msr is | |
159 | * set; otherwise this will use the saved values in the thread struct | |
160 | * for user-mode accesses. | |
161 | */ | |
162 | extern int emulate_loadstore(struct pt_regs *regs, struct instruction_op *op); | |
163 | ||
350779a2 | 164 | extern void emulate_vsx_load(struct instruction_op *op, union vsx_reg *reg, |
d955189a PM |
165 | const void *mem, bool cross_endian); |
166 | extern void emulate_vsx_store(struct instruction_op *op, | |
167 | const union vsx_reg *reg, void *mem, | |
168 | bool cross_endian); | |
b2543f7b | 169 | extern int emulate_dcbz(unsigned long ea, struct pt_regs *regs); |