Commit | Line | Data |
---|---|---|
ea195bb0 JM |
1 | /* EBPF opcode support. -*- c -*- |
2 | ||
3 | Copyright (C) 2019 Free Software Foundation, Inc. | |
4 | ||
5 | Contributed by Oracle, Inc. | |
6 | ||
7 | This file is part of the GNU Binutils and of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 3 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; if not, write to the Free Software | |
21 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
22 | MA 02110-1301, USA. */ | |
23 | ||
24 | /* | |
25 | Each section is delimited with start and end markers. | |
26 | ||
27 | <arch>-opc.h additions use: "-- opc.h" | |
28 | <arch>-opc.c additions use: "-- opc.c" | |
29 | <arch>-asm.c additions use: "-- asm.c" | |
30 | <arch>-dis.c additions use: "-- dis.c" | |
31 | <arch>-ibd.h additions use: "-- ibd.h". */ | |
32 | \f | |
33 | /* -- opc.h */ | |
34 | ||
35 | #undef CGEN_DIS_HASH_SIZE | |
36 | #define CGEN_DIS_HASH_SIZE 1 | |
37 | ||
38 | #undef CGEN_DIS_HASH | |
39 | #define CGEN_DIS_HASH(buffer, value) 0 | |
40 | ||
41 | /* Allows reason codes to be output when assembler errors occur. */ | |
42 | #define CGEN_VERBOSE_ASSEMBLER_ERRORS | |
43 | ||
44 | #define CGEN_VALIDATE_INSN_SUPPORTED | |
45 | extern int bpf_cgen_insn_supported (CGEN_CPU_DESC, const CGEN_INSN *); | |
46 | ||
47 | \f | |
48 | /* -- opc.c */ | |
49 | \f | |
50 | /* -- asm.c */ | |
51 | ||
52 | /* Parse a signed 64-bit immediate. */ | |
53 | ||
54 | static const char * | |
55 | parse_imm64 (CGEN_CPU_DESC cd, | |
56 | const char **strp, | |
57 | int opindex, | |
58 | int64_t *valuep) | |
59 | { | |
60 | bfd_vma value; | |
61 | enum cgen_parse_operand_result result; | |
62 | const char *errmsg; | |
63 | ||
64 | errmsg = (* cd->parse_operand_fn) | |
65 | (cd, CGEN_PARSE_OPERAND_INTEGER, strp, opindex, BFD_RELOC_NONE, | |
66 | &result, &value); | |
67 | if (!errmsg) | |
68 | *valuep = value; | |
69 | ||
70 | return errmsg; | |
71 | } | |
72 | ||
73 | /* Endianness size operands are integer immediates whose values can be | |
74 | 16, 32 or 64. */ | |
75 | ||
76 | static const char * | |
77 | parse_endsize (CGEN_CPU_DESC cd, | |
78 | const char **strp, | |
79 | int opindex, | |
80 | unsigned long *valuep) | |
81 | { | |
82 | const char *errmsg; | |
83 | ||
84 | errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, valuep); | |
85 | if (errmsg) | |
86 | return errmsg; | |
87 | ||
88 | switch (*valuep) | |
89 | { | |
90 | case 16: | |
91 | case 32: | |
92 | case 64: | |
93 | break; | |
94 | default: | |
95 | return _("expected 16, 32 or 64 in"); | |
96 | } | |
97 | ||
98 | return NULL; | |
99 | } | |
100 | ||
101 | /* Special check to ensure that the right instruction variant is used | |
102 | for the given endianness induced by the ISA selected in the CPU. | |
103 | See bpf.cpu for a discussion on how eBPF is really two instruction | |
104 | sets. */ | |
105 | ||
106 | int | |
107 | bpf_cgen_insn_supported (CGEN_CPU_DESC cd, const CGEN_INSN *insn) | |
108 | { | |
109 | CGEN_BITSET isas = CGEN_INSN_BITSET_ATTR_VALUE (insn, CGEN_INSN_ISA); | |
110 | ||
111 | return cgen_bitset_intersect_p (&isas, cd->isas); | |
112 | } | |
113 | ||
114 | \f | |
115 | /* -- dis.c */ | |
116 | ||
117 | /* We need to customize the disassembler a bit: | |
118 | - Use 8 bytes per line by default. | |
119 | */ | |
120 | ||
121 | #define CGEN_PRINT_INSN bpf_print_insn | |
122 | ||
123 | static int | |
124 | bpf_print_insn (CGEN_CPU_DESC cd, bfd_vma pc, disassemble_info *info) | |
125 | { | |
126 | bfd_byte buf[CGEN_MAX_INSN_SIZE]; | |
127 | int buflen; | |
128 | int status; | |
129 | ||
130 | info->bytes_per_chunk = 1; | |
131 | info->bytes_per_line = 8; | |
132 | ||
133 | /* Attempt to read the base part of the insn. */ | |
134 | buflen = cd->base_insn_bitsize / 8; | |
135 | status = (*info->read_memory_func) (pc, buf, buflen, info); | |
136 | ||
137 | /* Try again with the minimum part, if min < base. */ | |
138 | if (status != 0 && (cd->min_insn_bitsize < cd->base_insn_bitsize)) | |
139 | { | |
140 | buflen = cd->min_insn_bitsize / 8; | |
141 | status = (*info->read_memory_func) (pc, buf, buflen, info); | |
142 | } | |
143 | ||
144 | if (status != 0) | |
145 | { | |
146 | (*info->memory_error_func) (status, pc, info); | |
147 | return -1; | |
148 | } | |
149 | ||
150 | return print_insn (cd, pc, info, buf, buflen); | |
151 | } | |
152 | ||
153 | /* Signed immediates should be printed in hexadecimal. */ | |
154 | ||
155 | static void | |
156 | print_immediate (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED, | |
157 | void *dis_info, | |
158 | int64_t value, | |
159 | unsigned int attrs ATTRIBUTE_UNUSED, | |
160 | bfd_vma pc ATTRIBUTE_UNUSED, | |
161 | int length ATTRIBUTE_UNUSED) | |
162 | { | |
163 | disassemble_info *info = (disassemble_info *) dis_info; | |
164 | ||
165 | if (value <= 9) | |
166 | (*info->fprintf_func) (info->stream, "%" PRId64, value); | |
167 | else | |
168 | (*info->fprintf_func) (info->stream, "%#" PRIx64, value); | |
169 | ||
170 | /* This is to avoid -Wunused-function for print_normal. */ | |
171 | if (0) | |
172 | print_normal (cd, dis_info, value, attrs, pc, length); | |
173 | } | |
174 | ||
175 | /* Endianness bit sizes should be printed in decimal. */ | |
176 | ||
177 | static void | |
178 | print_endsize (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED, | |
179 | void *dis_info, | |
180 | unsigned long value, | |
181 | unsigned int attrs ATTRIBUTE_UNUSED, | |
182 | bfd_vma pc ATTRIBUTE_UNUSED, | |
183 | int length ATTRIBUTE_UNUSED) | |
184 | { | |
185 | disassemble_info *info = (disassemble_info *) dis_info; | |
186 | (*info->fprintf_func) (info->stream, "%lu", value); | |
187 | } | |
188 | ||
189 | \f | |
190 | /* -- */ | |
191 |