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d16005f8 PC |
1 | /* |
2 | * Copyright (C) 2014-2020 Paul Cercueil <paul@crapouillou.net> | |
3 | * | |
4 | * This library is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU Lesser General Public | |
6 | * License as published by the Free Software Foundation; either | |
7 | * version 2.1 of the License, or (at your option) any later version. | |
8 | * | |
9 | * This library is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * Lesser General Public License for more details. | |
13 | */ | |
14 | ||
15 | #include "config.h" | |
16 | ||
17 | #if ENABLE_DISASSEMBLER | |
18 | #include <dis-asm.h> | |
19 | #endif | |
20 | #include <stdbool.h> | |
21 | #include <stdlib.h> | |
22 | #include <string.h> | |
23 | ||
24 | #include "debug.h" | |
25 | #include "disassembler.h" | |
26 | #include "lightrec-private.h" | |
27 | #include "memmanager.h" | |
28 | ||
29 | static bool is_unconditional_jump(const struct opcode *op) | |
30 | { | |
31 | switch (op->i.op) { | |
32 | case OP_SPECIAL: | |
33 | return op->r.op == OP_SPECIAL_JR || op->r.op == OP_SPECIAL_JALR; | |
34 | case OP_J: | |
35 | case OP_JAL: | |
36 | return true; | |
37 | case OP_BEQ: | |
38 | case OP_BLEZ: | |
39 | return op->i.rs == op->i.rt; | |
40 | case OP_REGIMM: | |
41 | return (op->r.rt == OP_REGIMM_BGEZ || | |
42 | op->r.rt == OP_REGIMM_BGEZAL) && op->i.rs == 0; | |
43 | default: | |
44 | return false; | |
45 | } | |
46 | } | |
47 | ||
48 | static bool is_syscall(const struct opcode *op) | |
49 | { | |
50 | return (op->i.op == OP_SPECIAL && (op->r.op == OP_SPECIAL_SYSCALL || | |
51 | op->r.op == OP_SPECIAL_BREAK)) || | |
52 | (op->i.op == OP_CP0 && (op->r.rs == OP_CP0_MTC0 || | |
53 | op->r.rs == OP_CP0_CTC0) && | |
54 | (op->r.rd == 12 || op->r.rd == 13)); | |
55 | } | |
56 | ||
57 | void lightrec_free_opcode_list(struct lightrec_state *state, struct opcode *list) | |
58 | { | |
59 | struct opcode *next; | |
60 | ||
61 | while (list) { | |
62 | next = list->next; | |
63 | lightrec_free(state, MEM_FOR_IR, sizeof(*list), list); | |
64 | list = next; | |
65 | } | |
66 | } | |
67 | ||
68 | struct opcode * lightrec_disassemble(struct lightrec_state *state, | |
69 | const u32 *src, unsigned int *len) | |
70 | { | |
71 | struct opcode *head = NULL; | |
72 | bool stop_next = false; | |
73 | struct opcode *curr, *last; | |
74 | unsigned int i; | |
75 | ||
76 | for (i = 0, last = NULL; ; i++, last = curr) { | |
77 | curr = lightrec_calloc(state, MEM_FOR_IR, sizeof(*curr)); | |
78 | if (!curr) { | |
79 | pr_err("Unable to allocate memory\n"); | |
80 | lightrec_free_opcode_list(state, head); | |
81 | return NULL; | |
82 | } | |
83 | ||
84 | if (!last) | |
85 | head = curr; | |
86 | else | |
87 | last->next = curr; | |
88 | ||
89 | /* TODO: Take care of endianness */ | |
90 | curr->opcode = LE32TOH(*src++); | |
91 | curr->offset = i; | |
92 | ||
93 | /* NOTE: The block disassembly ends after the opcode that | |
94 | * follows an unconditional jump (delay slot) */ | |
95 | if (stop_next || is_syscall(curr)) | |
96 | break; | |
97 | else if (is_unconditional_jump(curr)) | |
98 | stop_next = true; | |
99 | } | |
100 | ||
101 | if (len) | |
102 | *len = (i + 1) * sizeof(u32); | |
103 | ||
104 | return head; | |
105 | } | |
106 | ||
107 | unsigned int lightrec_cycles_of_opcode(union code code) | |
108 | { | |
109 | switch (code.i.op) { | |
110 | case OP_META_REG_UNLOAD: | |
111 | case OP_META_SYNC: | |
112 | return 0; | |
113 | default: | |
114 | return 2; | |
115 | } | |
116 | } | |
117 | ||
118 | #if ENABLE_DISASSEMBLER | |
119 | void lightrec_print_disassembly(const struct block *block, | |
120 | const u32 *code, unsigned int length) | |
121 | { | |
122 | struct disassemble_info info; | |
123 | unsigned int i; | |
124 | ||
125 | memset(&info, 0, sizeof(info)); | |
126 | init_disassemble_info(&info, stdout, (fprintf_ftype) fprintf); | |
127 | ||
128 | info.buffer = (bfd_byte *) code; | |
129 | info.buffer_vma = (bfd_vma)(uintptr_t) code; | |
130 | info.buffer_length = length; | |
131 | info.flavour = bfd_target_unknown_flavour; | |
132 | info.arch = bfd_arch_mips; | |
133 | info.mach = bfd_mach_mips3000; | |
134 | disassemble_init_for_target(&info); | |
135 | ||
136 | for (i = 0; i < length; i += 4) { | |
137 | void print_insn_little_mips(bfd_vma, struct disassemble_info *); | |
138 | putc('\t', stdout); | |
139 | print_insn_little_mips((bfd_vma)(uintptr_t) code++, &info); | |
140 | putc('\n', stdout); | |
141 | } | |
142 | } | |
143 | #endif |