| 1 | /* |
| 2 | * Common Trace Format |
| 3 | * |
| 4 | * Integers read/write functions. |
| 5 | * |
| 6 | * Copyright 2010-2011 EfficiOS Inc. and Linux Foundation |
| 7 | * |
| 8 | * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 9 | * |
| 10 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 11 | * of this software and associated documentation files (the "Software"), to deal |
| 12 | * in the Software without restriction, including without limitation the rights |
| 13 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 14 | * copies of the Software, and to permit persons to whom the Software is |
| 15 | * furnished to do so, subject to the following conditions: |
| 16 | * |
| 17 | * The above copyright notice and this permission notice shall be included in |
| 18 | * all copies or substantial portions of the Software. |
| 19 | */ |
| 20 | |
| 21 | #include <babeltrace/ctf/types.h> |
| 22 | #include <babeltrace/bitfield.h> |
| 23 | #include <stdint.h> |
| 24 | #include <glib.h> |
| 25 | #include <babeltrace/endian.h> |
| 26 | |
| 27 | /* |
| 28 | * The aligned read/write functions are expected to be faster than the |
| 29 | * bitfield variants. They will be enabled eventually as an |
| 30 | * optimisation. |
| 31 | */ |
| 32 | |
| 33 | static |
| 34 | int _aligned_integer_read(struct stream_pos *ppos, |
| 35 | struct definition *definition) |
| 36 | { |
| 37 | struct definition_integer *integer_definition = |
| 38 | container_of(definition, struct definition_integer, p); |
| 39 | const struct declaration_integer *integer_declaration = |
| 40 | integer_definition->declaration; |
| 41 | struct ctf_stream_pos *pos = ctf_pos(ppos); |
| 42 | int rbo = (integer_declaration->byte_order != BYTE_ORDER); /* reverse byte order */ |
| 43 | |
| 44 | ctf_align_pos(pos, integer_declaration->p.alignment); |
| 45 | |
| 46 | if (!ctf_pos_access_ok(pos, integer_declaration->len)) |
| 47 | return -EFAULT; |
| 48 | |
| 49 | assert(!(pos->offset % CHAR_BIT)); |
| 50 | if (!integer_declaration->signedness) { |
| 51 | switch (integer_declaration->len) { |
| 52 | case 8: |
| 53 | { |
| 54 | uint8_t v; |
| 55 | |
| 56 | v = *(const uint8_t *) ctf_get_pos_addr(pos); |
| 57 | integer_definition->value._unsigned = v; |
| 58 | break; |
| 59 | } |
| 60 | case 16: |
| 61 | { |
| 62 | uint16_t v; |
| 63 | |
| 64 | v = *(const uint16_t *) ctf_get_pos_addr(pos); |
| 65 | integer_definition->value._unsigned = |
| 66 | rbo ? GUINT16_SWAP_LE_BE(v) : v; |
| 67 | break; |
| 68 | } |
| 69 | case 32: |
| 70 | { |
| 71 | uint32_t v; |
| 72 | |
| 73 | v = *(const uint32_t *) ctf_get_pos_addr(pos); |
| 74 | integer_definition->value._unsigned = |
| 75 | rbo ? GUINT32_SWAP_LE_BE(v) : v; |
| 76 | break; |
| 77 | } |
| 78 | case 64: |
| 79 | { |
| 80 | uint64_t v; |
| 81 | |
| 82 | v = *(const uint64_t *) ctf_get_pos_addr(pos); |
| 83 | integer_definition->value._unsigned = |
| 84 | rbo ? GUINT64_SWAP_LE_BE(v) : v; |
| 85 | break; |
| 86 | } |
| 87 | default: |
| 88 | assert(0); |
| 89 | } |
| 90 | } else { |
| 91 | switch (integer_declaration->len) { |
| 92 | case 8: |
| 93 | { |
| 94 | int8_t v; |
| 95 | |
| 96 | v = *(const int8_t *) ctf_get_pos_addr(pos); |
| 97 | integer_definition->value._signed = v; |
| 98 | break; |
| 99 | } |
| 100 | case 16: |
| 101 | { |
| 102 | int16_t v; |
| 103 | |
| 104 | v = *(const int16_t *) ctf_get_pos_addr(pos); |
| 105 | integer_definition->value._signed = |
| 106 | rbo ? (int16_t) GUINT16_SWAP_LE_BE(v) : v; |
| 107 | break; |
| 108 | } |
| 109 | case 32: |
| 110 | { |
| 111 | int32_t v; |
| 112 | |
| 113 | v = *(const int32_t *) ctf_get_pos_addr(pos); |
| 114 | integer_definition->value._signed = |
| 115 | rbo ? (int32_t) GUINT32_SWAP_LE_BE(v) : v; |
| 116 | break; |
| 117 | } |
| 118 | case 64: |
| 119 | { |
| 120 | int64_t v; |
| 121 | |
| 122 | v = *(const int64_t *) ctf_get_pos_addr(pos); |
| 123 | integer_definition->value._signed = |
| 124 | rbo ? (int64_t) GUINT64_SWAP_LE_BE(v) : v; |
| 125 | break; |
| 126 | } |
| 127 | default: |
| 128 | assert(0); |
| 129 | } |
| 130 | } |
| 131 | ctf_move_pos(pos, integer_declaration->len); |
| 132 | return 0; |
| 133 | } |
| 134 | |
| 135 | static |
| 136 | int _aligned_integer_write(struct stream_pos *ppos, |
| 137 | struct definition *definition) |
| 138 | { |
| 139 | struct definition_integer *integer_definition = |
| 140 | container_of(definition, struct definition_integer, p); |
| 141 | const struct declaration_integer *integer_declaration = |
| 142 | integer_definition->declaration; |
| 143 | struct ctf_stream_pos *pos = ctf_pos(ppos); |
| 144 | int rbo = (integer_declaration->byte_order != BYTE_ORDER); /* reverse byte order */ |
| 145 | |
| 146 | ctf_align_pos(pos, integer_declaration->p.alignment); |
| 147 | |
| 148 | if (!ctf_pos_access_ok(pos, integer_declaration->len)) |
| 149 | return -EFAULT; |
| 150 | |
| 151 | assert(!(pos->offset % CHAR_BIT)); |
| 152 | if (pos->dummy) |
| 153 | goto end; |
| 154 | if (!integer_declaration->signedness) { |
| 155 | uint64_t v = integer_definition->value._unsigned; |
| 156 | |
| 157 | switch (integer_declaration->len) { |
| 158 | case 8: *(uint8_t *) ctf_get_pos_addr(pos) = (uint8_t) v; |
| 159 | break; |
| 160 | case 16: |
| 161 | *(uint16_t *) ctf_get_pos_addr(pos) = rbo ? |
| 162 | GUINT16_SWAP_LE_BE((uint16_t) v) : |
| 163 | (uint16_t) v; |
| 164 | break; |
| 165 | case 32: |
| 166 | *(uint32_t *) ctf_get_pos_addr(pos) = rbo ? |
| 167 | GUINT32_SWAP_LE_BE((uint32_t) v) : |
| 168 | (uint32_t) v; |
| 169 | break; |
| 170 | case 64: |
| 171 | *(uint64_t *) ctf_get_pos_addr(pos) = rbo ? |
| 172 | GUINT64_SWAP_LE_BE(v) : v; |
| 173 | break; |
| 174 | default: |
| 175 | assert(0); |
| 176 | } |
| 177 | } else { |
| 178 | int64_t v = integer_definition->value._signed; |
| 179 | |
| 180 | switch (integer_declaration->len) { |
| 181 | case 8: *(int8_t *) ctf_get_pos_addr(pos) = (int8_t) v; |
| 182 | break; |
| 183 | case 16: |
| 184 | *(int16_t *) ctf_get_pos_addr(pos) = rbo ? |
| 185 | (int16_t) GUINT16_SWAP_LE_BE((int16_t) v) : |
| 186 | (int16_t) v; |
| 187 | break; |
| 188 | case 32: |
| 189 | *(int32_t *) ctf_get_pos_addr(pos) = rbo ? |
| 190 | (int32_t) GUINT32_SWAP_LE_BE((int32_t) v) : |
| 191 | (int32_t) v; |
| 192 | break; |
| 193 | case 64: |
| 194 | *(int64_t *) ctf_get_pos_addr(pos) = rbo ? |
| 195 | GUINT64_SWAP_LE_BE(v) : v; |
| 196 | break; |
| 197 | default: |
| 198 | assert(0); |
| 199 | } |
| 200 | } |
| 201 | end: |
| 202 | ctf_move_pos(pos, integer_declaration->len); |
| 203 | return 0; |
| 204 | } |
| 205 | |
| 206 | int ctf_integer_read(struct stream_pos *ppos, struct definition *definition) |
| 207 | { |
| 208 | struct definition_integer *integer_definition = |
| 209 | container_of(definition, struct definition_integer, p); |
| 210 | const struct declaration_integer *integer_declaration = |
| 211 | integer_definition->declaration; |
| 212 | struct ctf_stream_pos *pos = ctf_pos(ppos); |
| 213 | |
| 214 | if (!(integer_declaration->p.alignment % CHAR_BIT) |
| 215 | && !(integer_declaration->len % CHAR_BIT)) { |
| 216 | return _aligned_integer_read(ppos, definition); |
| 217 | } |
| 218 | |
| 219 | ctf_align_pos(pos, integer_declaration->p.alignment); |
| 220 | |
| 221 | if (!ctf_pos_access_ok(pos, integer_declaration->len)) |
| 222 | return -EFAULT; |
| 223 | |
| 224 | if (!integer_declaration->signedness) { |
| 225 | if (integer_declaration->byte_order == LITTLE_ENDIAN) |
| 226 | bt_bitfield_read_le(pos->base, unsigned long, |
| 227 | pos->offset, integer_declaration->len, |
| 228 | &integer_definition->value._unsigned); |
| 229 | else |
| 230 | bt_bitfield_read_be(pos->base, unsigned long, |
| 231 | pos->offset, integer_declaration->len, |
| 232 | &integer_definition->value._unsigned); |
| 233 | } else { |
| 234 | if (integer_declaration->byte_order == LITTLE_ENDIAN) |
| 235 | bt_bitfield_read_le(pos->base, unsigned long, |
| 236 | pos->offset, integer_declaration->len, |
| 237 | &integer_definition->value._signed); |
| 238 | else |
| 239 | bt_bitfield_read_be(pos->base, unsigned long, |
| 240 | pos->offset, integer_declaration->len, |
| 241 | &integer_definition->value._signed); |
| 242 | } |
| 243 | ctf_move_pos(pos, integer_declaration->len); |
| 244 | return 0; |
| 245 | } |
| 246 | |
| 247 | int ctf_integer_write(struct stream_pos *ppos, struct definition *definition) |
| 248 | { |
| 249 | struct definition_integer *integer_definition = |
| 250 | container_of(definition, struct definition_integer, p); |
| 251 | const struct declaration_integer *integer_declaration = |
| 252 | integer_definition->declaration; |
| 253 | struct ctf_stream_pos *pos = ctf_pos(ppos); |
| 254 | |
| 255 | if (!(integer_declaration->p.alignment % CHAR_BIT) |
| 256 | && !(integer_declaration->len % CHAR_BIT)) { |
| 257 | return _aligned_integer_write(ppos, definition); |
| 258 | } |
| 259 | |
| 260 | ctf_align_pos(pos, integer_declaration->p.alignment); |
| 261 | |
| 262 | if (!ctf_pos_access_ok(pos, integer_declaration->len)) |
| 263 | return -EFAULT; |
| 264 | |
| 265 | if (pos->dummy) |
| 266 | goto end; |
| 267 | if (!integer_declaration->signedness) { |
| 268 | if (integer_declaration->byte_order == LITTLE_ENDIAN) |
| 269 | bt_bitfield_write_le(pos->base, unsigned long, |
| 270 | pos->offset, integer_declaration->len, |
| 271 | integer_definition->value._unsigned); |
| 272 | else |
| 273 | bt_bitfield_write_be(pos->base, unsigned long, |
| 274 | pos->offset, integer_declaration->len, |
| 275 | integer_definition->value._unsigned); |
| 276 | } else { |
| 277 | if (integer_declaration->byte_order == LITTLE_ENDIAN) |
| 278 | bt_bitfield_write_le(pos->base, unsigned long, |
| 279 | pos->offset, integer_declaration->len, |
| 280 | integer_definition->value._signed); |
| 281 | else |
| 282 | bt_bitfield_write_be(pos->base, unsigned long, |
| 283 | pos->offset, integer_declaration->len, |
| 284 | integer_definition->value._signed); |
| 285 | } |
| 286 | end: |
| 287 | ctf_move_pos(pos, integer_declaration->len); |
| 288 | return 0; |
| 289 | } |