1 # read: analogously to write, support reading from in-memory streams in 2 # addition to file descriptors. 3 # 4 # We can pass it either a file descriptor or an address to a stream. If a 5 # file descriptor is passed in, we _read from it using the right syscall. If a 6 # stream is passed in (a fake file descriptor), we read from it instead. This 7 # lets us initialize input for tests. 8 # 9 # A little counter-intuitively, the output of 'read' ends up in.. a stream. So 10 # tests end up doing a redundant copy. Why? Well, consider the alternatives: 11 # 12 # a) Reading into a string, and returning a pointer to the end of the read 13 # region, or a count of bytes written. Now this count or end pointer must be 14 # managed separately by the caller, which can be error-prone. 15 # 16 # b) Having 'read' return a buffer that it allocates. But there's no way to 17 # know in advance how large to make the buffer. If you read less than the 18 # size of the buffer you again end up needing to manage initialized vs 19 # uninitialized memory. 20 # 21 # c) Creating more helpful variants like 'read-byte' or 'read-until' which 22 # also can take a file descriptor or stream, just like 'write'. But such 23 # primitives don't exist in the Linux kernel, so we'd be implementing them 24 # somehow, either with more internal buffering or by making multiple 25 # syscalls. 26 # 27 # Reading into a stream avoids these problems. The buffer is externally 28 # provided and the caller has control over where it's allocated, its lifetime, 29 # and so on. The buffer's read and write pointers are internal to it so it's 30 # easier to keep in a consistent state. And it can now be passed directly to 31 # helpers like 'read-byte' or 'read-until' that only need to support streams, 32 # never file descriptors. 33 # 34 # Like with 'write', we assume our data segment will never begin at an address 35 # shorter than 0x08000000, so any smaller arguments are assumed to be real 36 # file descriptors. 37 # 38 # As a reminder, a stream looks like this: 39 # write: int # index at which to write to next 40 # read: int # index at which to read next 41 # data: (array byte) # prefixed by size as usual 42 43 == code 44 # instruction effective address register displacement immediate 45 # . op subop mod rm32 base index scale r32 46 # . 1-3 bytes 3 bits 2 bits 3 bits 3 bits 3 bits 2 bits 2 bits 0/1/2/4 bytes 0/1/2/4 bytes 47 48 read: # f: fd or (addr stream byte), s: (addr stream byte) -> num-bytes-read/eax: int 49 # . prologue 50 55/push-ebp 51 89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp 52 # if (f < 0x08000000) return _read(f, s) # f can't be a user-mode address, so treat it as a kernel file descriptor 53 81 7/subop/compare 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 0x08000000/imm32 # compare *(ebp+8) 54 73/jump-if-addr>= $read:fake/disp8 55 # . . push args 56 ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12) 57 ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8) 58 # . . call 59 e8/call _read/disp32 60 # . . discard args 61 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp 62 # return 63 eb/jump $read:end/disp8 64 $read:fake: 65 # otherwise, treat 'f' as a stream to scan from 66 # . save registers 67 56/push-esi 68 57/push-edi 69 # esi = f 70 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 6/r32/esi 8/disp8 . # copy *(ebp+8) to esi 71 # edi = s 72 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 7/r32/edi 0xc/disp8 . # copy *(ebp+12) to esi 73 # eax = _buffer-4(out = &s->data[s->write], outend = &s->data[s->size], 74 # in = &f->data[f->read], inend = &f->data[f->write]) 75 # . . push &f->data[f->write] 76 8b/copy 0/mod/indirect 6/rm32/esi . . . 0/r32/eax . . # copy *esi to eax 77 8d/copy-address 1/mod/*+disp8 4/rm32/sib 6/base/esi 0/index/eax . 0/r32/eax 0xc/disp8 . # copy esi+eax+12 to eax 78 50/push-eax 79 # . . push &f->data[f->read] 80 8b/copy 1/mod/*+disp8 6/rm32/esi . . . 0/r32/eax 4/disp8 . # copy *(esi+4) to eax 81 8d/copy-address 1/mod/*+disp8 4/rm32/sib 6/base/esi 0/index/eax . 0/r32/eax 0xc/disp8 . # copy esi+eax+12 to eax 82 50/push-eax 83 # . . push &s->data[s->size] 84 8b/copy 1/mod/*+disp8 7/rm32/edi . . . 0/r32/eax 8/disp8 . # copy *(edi+8) to eax 85 8d/copy-address 1/mod/*+disp8 4/rm32/sib 7/base/edi 0/index/eax . 0/r32/eax 0xc/disp8 . # copy edi+eax+12 to eax 86 50/push-eax 87 # . . push &s->data[s->write] 88 8b/copy 0/mod/indirect 7/rm32/edi . . . 0/r32/eax . . # copy *edi to eax 89 8d/copy-address 1/mod/*+disp8 4/rm32/sib 7/base/edi 0/index/eax . 0/r32/eax 0xc/disp8 . # copy edi+eax+12 to eax 90 50/push-eax 91 # . . call 92 e8/call _buffer-4/disp32 93 # . . discard args 94 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0x10/imm32 # add to esp 95 # s->write += eax 96 01/add 0/mod/indirect 7/rm32/edi . . . 0/r32/eax . . # add eax to *edi 97 # f->read += eax 98 01/add 1/mod/*+disp8 6/rm32/esi . . . 0/r32/eax 4/disp8 . # add eax to *(esi+4) 99 # . restore registers 100 5f/pop-to-edi 101 5e/pop-to-esi 102 $read:end: 103 # . epilogue 104 89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . .pre { line-height: 125%; } td.linenos .normal { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; } span.linenos { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; } td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; } span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; } .highlight .hll { background-color: #ffffcc } .highlight .c { color: #888888 } /* Comment */ .highlight .err { color: #a61717; background-color: #e3d2d2 } /* Error */ .highlight .k { color: #008800; font-weight: bold } /* Keyword */ .highlight .ch { color: #888888 } /* Comment.Hashbang */ .highlight .cm { color: #888888 } /* Comment.Multiline */ .highlight .cp { color: #cc0000; font-weight: bold } /* Comment.Preproc */ .highlight .cpf { color: #888888 } /* Comment.PreprocFile */ .highlight .c1 { color: #888888 } /* Comment.Single */ .highlight .cs { color: #cc0000; font-weight: bold; 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font-weight: bold } /* Literal.Number.Bin */ .highlight .mf { color: #0000DD; font-weight: bold } /* Literal.Number.Float */ .highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */ .highlight .mi { color: #0000DD; font-weight: bold } /* Literal.Number.Integer */ .highlight .mo { color: #0000DD; font-weight: bold } /* Literal.Number.Oct */ .highlight .sa { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Affix */ .highlight .sb { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Backtick */ .highlight .sc { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Char */ .highlight .dl { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Delimiter */ .highlight .sd { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Doc */ .highlight .s2 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Double */ .highlight .se { color: #0044dd; background-color: #fff0f0 } /* Literal.String.Escape */ .highlight .sh { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Heredoc */ .highlight .si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */ .highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */ .highlight .sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */ .highlight .s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */ .highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */ .highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */ .highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */ .highlight .vc { color: #336699 } /* Name.Variable.Class */ .highlight .vg { color: #dd7700 } /* Name.Variable.Global */ .highlight .vi { color: #3333bb } /* Name.Variable.Instance */ .highlight .vm { color: #336699 } /* Name.Variable.Magic */ .highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */class="Normal"> . . 4/r32/esp . . # copy esp to ebp 149 # . save registers 150 51/push-ecx 151 52/push-edx 152 53/push-ebx 153 56/push-esi 154 57/push-edi 155 # eax/num_bytes_buffered = 0 156 b8/copy-to-eax 0/imm32 157 # edi = out 158 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 7/r32/edi 8/disp8 . # copy *(ebp+8) to edi 159 # edx = outend 160 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 2/r32/edx 0xc/disp8 . # copy *(ebp+12) to edx 161 # esi = in 162 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 6/r32/esi 0x10/disp8 . # copy *(ebp+16) to esi 163 # ecx = inend 164 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 1/r32/ecx 0x14/disp8 . # copy *(ebp+20) to ecx 165 $_buffer-4:loop: 166 # if (in >= inend) break 167 39/compare 3/mod/direct 6/rm32/esi . . . 1/r32/ecx . . # compare esi with ecx 168 73/jump-if-addr>= $_buffer-4:end/disp8 169 # if (out >= outend) break # for now silently ignore filled up buffer 170 39/compare 3/mod/direct 7/rm32/edi . . . 2/r32/edx . . # compare edi with edx 171 73/jump-if-addr>= $_buffer-4:end/disp8 172 # *out = *in 173 8a/copy-byte 0/mod/indirect 6/rm32/esi . . . 3/r32/BL . . # copy byte at *esi to BL 174 88/copy-byte 0/mod/indirect 7/rm32/edi . . . 3/r32/BL . . # copy byte at BL to *edi 175 # ++num_bytes_buffered 176 40/increment-eax 177 # ++in 178 46/increment-esi 179 # ++out 180 47/increment-edi 181 eb/jump $_buffer-4:loop/disp8 182 $_buffer-4:end: 183 # . restore registers 184 5f/pop-to-edi 185 5e/pop-to-esi 186 5b/pop-to-ebx 187 5a/pop-to-edx 188 59/pop-to-ecx 189 # . epilogue 190 89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp 191 5d/pop-to-ebp 192 c3/return 193 194 # idea: a clear-if-empty method on streams that clears only if f->read == f->write 195 # Unclear how I'd use it, though. Callers seem to need the check anyway. 196 # Maybe a better helper would be 'empty-stream?' 197 198 _read: # fd: int, s: (addr stream byte) -> num-bytes-read/eax: int 199 # . prologue 200 55/push-ebp 201 89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp 202 # . save registers 203 51/push-ecx 204 52/push-edx 205 53/push-ebx 206 56/push-esi 207 # esi = s 208 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 6/r32/esi 0xc/disp8 . # copy *(ebp+12) to esi 209 # eax = s->write 210 8b/copy 0/mod/indirect 6/rm32/esi . . . 0/r32/eax . . # copy *esi to eax 211 # edx = s->size 212 8b/copy 1/mod/*+disp8 6/rm32/esi . . . 2/r32/edx 8/disp8 . # copy *(esi+8) to edx 213 # syscall(read, fd, &s->data[s->write], s->size - s->write) 214 # . . fd: ebx 215 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 3/r32/ebx 8/disp8 . # copy *(ebp+8) to ebx 216 # . . data: ecx = &s->data[s->write] 217 8d/copy-address 1/mod/*+disp8 4/rm32/sib 6/base/esi 0/index/eax . 1/r32/ecx 0xc/disp8 . # copy esi+eax+12 to ecx 218 # . . size: edx = s->size - s->write 219 29/subtract 3/mod/direct 2/rm32/edx . . . 0/r32/eax . . # subtract eax from edx 220 # . . syscall 221 e8/call syscall_read/disp32 222 # add the result eax to s->write 223 01/add 0/mod/indirect 6/rm32/esi . . . 0/r32/eax . . # add eax to *esi 224 $_read:end: 225 # . restore registers 226 5e/pop-to-esi 227 5b/pop-to-ebx 228 5a/pop-to-edx 229 59/pop-to-ecx 230 # . epilogue 231 89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp 232 5d/pop-to-ebp 233 c3/return 234 235 # Two options: 236 # 1 (what we have above): 237 # ecx = s 238 # eax = s->write 239 # edx = s->size 240 # # syscall 241 # ecx = lea ecx+eax+12 242 # edx = sub edx eax 243 # 244 # 2: 245 # ecx = s 246 # edx = s->size 247 # ecx = &s->data 248 # # syscall 249 # ecx = add ecx, s->write 250 # edx = sub edx, s->write 251 # 252 # Not much to choose between the two? Option 2 performs a duplicate load to 253 # use one less register, but doesn't increase the amount of spilling (ecx 254 # and edx must be used, and eax must be clobbered anyway). 255 256 # - tests 257 258 test-read-single: 259 # - write a single character into _test-stream, then read from it 260 # clear-stream(_test-stream) 261 # . . push args 262 68/push _test-stream/imm32 263 # . . call 264 e8/call clear-stream/disp32 265 # . . discard args 266 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp 267 # clear-stream(_test-tmp-stream) 268 # . . push args 269 68/push _test-tmp-stream/imm32 270 # . . call 271 e8/call clear-stream/disp32 272 # . . discard args 273 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp 274 # write(_test-stream, "Ab") 275 # . . push args 276 68/push "Ab"/imm32 277 68/push _test-stream/imm32 278 # . . call 279 e8/call write/disp32 280 # . . discard args 281 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp 282 # eax = read(_test-stream, _test-tmp-stream) 283 # . . push args 284 68/push _test-tmp-stream/imm32 285 68/push _test-stream/imm32 286 # . . call 287 e8/call read/disp32 288 # . . discard args 289 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp 290 # check-ints-equal(eax, 2, msg) 291 # . . push args 292 68/push "F - test-read-single: return value"/imm32 293 68/push 2/imm32 294 50/push-eax 295 # . . call 296 e8/call check-ints-equal/disp32 297 # . . discard args 298 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp 299 # check-stream-equal(_test-tmp-stream, "Ab", msg) 300 # . . push args 301 68/push "F - test-read-single"/imm32 302 68/push "Ab"/imm32 303 68/push _test-tmp-stream/imm32 304 # . . call 305 e8/call check-stream-equal/disp32 306 # . . discard args 307 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp 308 # end 309 c3/return 310 311 test-read-is-stateful: 312 # - make two consecutive reads, check that their results are appended 313 # clear-stream(_test-stream) 314 # . . push args 315 68/push _test-stream/imm32 316 # . . call 317 e8/call clear-stream/disp32 318 # . . discard args 319 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp 320 # clear-stream(_test-tmp-stream) 321 # . . push args 322 68/push _test-tmp-stream/imm32 323 # . . call 324 e8/call clear-stream/disp32 325 # . . discard args 326 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp 327 # write(_test-stream, "C") 328 # . . push args 329 68/push "C"/imm32 330 68/push _test-stream/imm32 331 # . . call 332 e8/call write/disp32 333 # . . discard args 334 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp 335 # read(_test-stream, _test-tmp-stream) 336 # . . push args 337 68/push _test-tmp-stream/imm32 338 68/push _test-stream/imm32 339 # . . call 340 e8/call read/disp32 341 # . . discard args 342 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp 343 # write(_test-stream, "D") 344 # . . push args 345 68/push "D"/imm32 346 68/push _test-stream/imm32 347 # . . call 348 e8/call write/disp32 349 # . . discard args 350 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp 351 # read(_test-stream, _test-tmp-stream) 352 # . . push args 353 68/push _test-tmp-stream/imm32 354 68/push _test-stream/imm32 355 # . . call 356 e8/call read/disp32 357 # . . discard args 358 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp 359 # check-stream-equal(_test-tmp-stream, "CD", msg) 360 # . . push args 361 68/push "F - test-read-is-stateful"/imm32 362 68/push "CD"/imm32 363 68/push _test-tmp-stream/imm32 364 # . . call 365 e8/call check-stream-equal/disp32 366 # . . discard args 367 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp 368 # end 369 c3/return 370 371 test-read-returns-0-on-end-of-file: 372 # - read after hitting end-of-file, check that result is 0 373 # setup 374 # . clear-stream(_test-stream) 375 # . . push args 376 68/push _test-stream/imm32 377 # . . call 378 e8/call clear-stream/disp32 379 # . . discard args 380 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp 381 # . clear-stream(_test-tmp-stream) 382 # . . push args 383 68/push _test-tmp-stream/imm32 384 # . . call 385 e8/call clear-stream/disp32 386 # . . discard args 387 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp 388 # . write(_test-stream, "Ab") 389 # . . push args 390 68/push "Ab"/imm32 391 68/push _test-stream/imm32 392 # . . call 393 e8/call write/disp32 394 # . . discard args 395 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp 396 # first read gets to end-of-file 397 # . read(_test-stream, _test-tmp-stream) 398 # . . push args 399 68/push _test-tmp-stream/imm32 400 68/push _test-stream/imm32 401 # . . call 402 e8/call read/disp32 403 # . . discard args 404 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp 405 # second read 406 # . read(_test-stream, _test-tmp-stream) 407 # . . push args 408 68/push _test-tmp-stream/imm32 409 68/push _test-stream/imm32 410 # . . call 411 e8/call read/disp32 412 # . . discard args 413 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp 414 # check-ints-equal(eax, 0, msg) 415 # . . push args 416 68/push "F - test-read-returns-0-on-end-of-file"/imm32 417 68/push 0/imm32 418 50/push-eax 419 # . . call 420 e8/call check-ints-equal/disp32 421 # . . discard args 422 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp 423 # end 424 c3/return 425 426 == data 427 428 _test-tmp-stream: # (stream byte) 429 # current write index 430 0/imm32 431 # current read index 432 0/imm32 433 # size 434 8/imm32 435 # data 436 00 00 00 00 00 00 00 00 # 8 bytes 437 438 # . . vim:nowrap:textwidth=0Console (X) #0 09/12/06 console commands (X) #1 09/12/06 quick find (X) #2 09/12/06 open with (X) #4 09/12/06 history for console (X) #13 09/12/27 display docstring of a command General (X) #5 09/12/06 move code from fm into objects (X) #6 09/12/06 move main to __init__ (X) #7 09/12/06 cooler titlebar (X) #8 09/12/17 Add operations to modify files/directories (X) #9 09/12/24 add a widget for managing running operations (X) #10 09/12/24 sorting (X) #11 09/12/27 filter (X) #12 09/12/27 jump through the list in a specific order (X) #14 09/12/29 make filelists inherit from pagers (X) #15 09/12/29 better way of running processes!!~ (X) #16 10/01/01 list of bookmarks (X) #21 10/01/01 write help! ( ) #22 10/01/03 add getopt options to change flags/mode Bugs (X) #17 10/01/01 why do bookmarks disappear sometimes? (X) #18 10/01/01 fix notify widget (by adding a LogView?) (X) #19 10/01/01 resizing after pressing g ( ) #23 10/01/04 stop dir loading with ^C -> wont load anymore Ideas ( ) #20 10/01/01 use inotify to monitor filesystem changes ( ) #24 10/01/06 progress bar