binutils/objdump.1

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 138 .\"
 139 .IX Title "OBJDUMP.1 1"
 140 .TH OBJDUMP.1 1 "binutils-2.11.90" "2001-05-30" "GNU"
 141 .UC
 142 .SH "NAME"
 143 objdump \- display information from object files.
 144 .SH "SYNOPSIS"
 145 .IX Header "SYNOPSIS"
 146 objdump [ \-a | \-\-archive-headers ]
 147         [ \-b \fIbfdname\fR | \-\-target=\fIbfdname\fR ]
 148         [ \-C | \-\-demangle[=\fIstyle\fR] ]
 149         [ \-d | \-\-disassemble ]
 150         [ \-D | \-\-disassemble-all ]
 151         [ \-z | \-\-disassemble-zeroes ]
 152         [ \-EB | \-EL | \-\-endian={big | little } ]
 153         [ \-f | \-\-file-headers ]
 154         [ \-\-file-start-context ]
 155         [ \-g | \-\-debugging ]
 156         [ \-h | \-\-section-headers | \-\-headers ]
 157         [ \-i | \-\-info ]
 158         [ \-j \fIsection\fR | \-\-section=\fIsection\fR ]
 159         [ \-l | \-\-line-numbers ]
 160         [ \-S | \-\-source ]
 161         [ \-m \fImachine\fR | \-\-architecture=\fImachine\fR ]
 162         [ \-M \fIoptions\fR | \-\-disassembler-options=\fIoptions\fR]
 163         [ \-p | \-\-private-headers ]
 164         [ \-r | \-\-reloc ]
 165         [ \-R | \-\-dynamic-reloc ]
 166         [ \-s | \-\-full-contents ]
 167         [ \-G | \-\-stabs ]
 168         [ \-t | \-\-syms ]
 169         [ \-T | \-\-dynamic-syms ]
 170         [ \-x | \-\-all-headers ]
 171         [ \-w | \-\-wide ]
 172         [ \-\-start-address=\fIaddress\fR ]
 173         [ \-\-stop-address=\fIaddress\fR ]
 174         [ \-\-prefix-addresses]
 175         [ \-\-[no-]show-raw-insn ]
 176         [ \-\-adjust-vma=\fIoffset\fR ]
 177         [ \-V | \-\-version ]
 178         [ \-H | \-\-help ]
 179         \fIobjfile\fR...
 180 .SH "DESCRIPTION"
 181 .IX Header "DESCRIPTION"
 182 \&\f(CW\*(C`objdump\*(C'\fR displays information about one or more object files.
 183 The options control what particular information to display.  This
 184 information is mostly useful to programmers who are working on the
 185 compilation tools, as opposed to programmers who just want their
 186 program to compile and work.
 187 .PP
 188 \&\fIobjfile\fR... are the object files to be examined.  When you
 189 specify archives, \f(CW\*(C`objdump\*(C'\fR shows information on each of the member
 190 object files.
 191 .SH "OPTIONS"
 192 .IX Header "OPTIONS"
 193 The long and short forms of options, shown here as alternatives, are
 194 equivalent.  At least one option from the list
 195 \&\fB\-a,\-d,\-D,\-f,\-g,\-G,\-h,\-H,\-p,\-r,\-R,\-S,\-t,\-T,\-V,\-x\fR must be given.
 196 .Ip "\f(CW\*(C`\-a\*(C'\fR" 4
 197 .IX Item "-a"
 198 .Ip "\f(CW\*(C`\-\-archive\-header\*(C'\fR" 4
 199 .IX Item "--archive-header"
 200 If any of the \fIobjfile\fR files are archives, display the archive
 201 header information (in a format similar to \fBls \-l\fR).  Besides the
 202 information you could list with \fBar tv\fR, \fBobjdump \-a\fR shows
 203 the object file format of each archive member.
 204 .Ip "\f(CW\*(C`\-\-adjust\-vma=\f(CIoffset\f(CW\*(C'\fR" 4
 205 .IX Item "--adjust-vma=offset"
 206 When dumping information, first add \fIoffset\fR to all the section
 207 addresses.  This is useful if the section addresses do not correspond to
 208 the symbol table, which can happen when putting sections at particular
 209 addresses when using a format which can not represent section addresses,
 210 such as a.out.
 211 .Ip "\f(CW\*(C`\-b \f(CIbfdname\f(CW\*(C'\fR" 4
 212 .IX Item "-b bfdname"
 213 .Ip "\f(CW\*(C`\-\-target=\f(CIbfdname\f(CW\*(C'\fR" 4
 214 .IX Item "--target=bfdname"
 215 Specify that the object-code format for the object files is
 216 \&\fIbfdname\fR.  This option may not be necessary; \fIobjdump\fR can
 217 automatically recognize many formats.
 218 .Sp
 219 For example,
 220 .Sp
 221 .Vb 1
 222 \&        objdump -b oasys -m vax -h fu.o
 223 .Ve
 224 displays summary information from the section headers (\fB\-h\fR) of
 225 \&\fIfu.o\fR, which is explicitly identified (\fB\-m\fR) as a \s-1VAX\s0 object
 226 file in the format produced by Oasys compilers.  You can list the
 227 formats available with the \fB\-i\fR option.
 228 .Ip "\f(CW\*(C`\-C\*(C'\fR" 4
 229 .IX Item "-C"
 230 .Ip "\f(CW\*(C`\-\-demangle[=\f(CIstyle\f(CW]\*(C'\fR" 4
 231 .IX Item "--demangle[=style]"
 232 Decode (\fIdemangle\fR) low-level symbol names into user-level names.
 233 Besides removing any initial underscore prepended by the system, this
 234 makes \*(C+ function names readable.  Different compilers have different
 235 mangling styles. The optional demangling style argument can be used to
 236 choose an appropriate demangling style for your compiler.
 237 .Ip "\f(CW\*(C`\-G\*(C'\fR" 4
 238 .IX Item "-G"
 239 .Ip "\f(CW\*(C`\-\-debugging\*(C'\fR" 4
 240 .IX Item "--debugging"
 241 Display debugging information.  This attempts to parse debugging
 242 information stored in the file and print it out using a C like syntax.
 243 Only certain types of debugging information have been implemented.
 244 .Ip "\f(CW\*(C`\-d\*(C'\fR" 4
 245 .IX Item "-d"
 246 .Ip "\f(CW\*(C`\-\-disassemble\*(C'\fR" 4
 247 .IX Item "--disassemble"
 248 Display the assembler mnemonics for the machine instructions from
 249 \&\fIobjfile\fR.  This option only disassembles those sections which are
 250 expected to contain instructions.
 251 .Ip "\f(CW\*(C`\-D\*(C'\fR" 4
 252 .IX Item "-D"
 253 .Ip "\f(CW\*(C`\-\-disassemble\-all\*(C'\fR" 4
 254 .IX Item "--disassemble-all"
 255 Like \fB\-d\fR, but disassemble the contents of all sections, not just
 256 those expected to contain instructions.
 257 .Ip "\f(CW\*(C`\-\-prefix\-addresses\*(C'\fR" 4
 258 .IX Item "--prefix-addresses"
 259 When disassembling, print the complete address on each line.  This is
 260 the older disassembly format.
 261 .Ip "\f(CW\*(C`\-\-disassemble\-zeroes\*(C'\fR" 4
 262 .IX Item "--disassemble-zeroes"
 263 Normally the disassembly output will skip blocks of zeroes.  This
 264 option directs the disassembler to disassemble those blocks, just like
 265 any other data.
 266 .Ip "\f(CW\*(C`\-EB\*(C'\fR" 4
 267 .IX Item "-EB"
 268 .Ip "\f(CW\*(C`\-EL\*(C'\fR" 4
 269 .IX Item "-EL"
 270 .Ip "\f(CW\*(C`\-\-endian={big|little}\*(C'\fR" 4
 271 .IX Item "--endian={big|little}"
 272 Specify the endianness of the object files.  This only affects
 273 disassembly.  This can be useful when disassembling a file format which
 274 does not describe endianness information, such as S-records.
 275 .Ip "\f(CW\*(C`\-f\*(C'\fR" 4
 276 .IX Item "-f"
 277 .Ip "\f(CW\*(C`\-\-file\-header\*(C'\fR" 4
 278 .IX Item "--file-header"
 279 Display summary information from the overall header of
 280 each of the \fIobjfile\fR files.
 281 .Ip "\f(CW\*(C`\-\-file\-start\-context\*(C'\fR" 4
 282 .IX Item "--file-start-context"
 283 Specify that when displaying interlisted source code/disassembly
 284 (assumes '\-S') from a file that has not yet been displayed, extend the
 285 context to the start of the file.
 286 .Ip "\f(CW\*(C`\-h\*(C'\fR" 4
 287 .IX Item "-h"
 288 .Ip "\f(CW\*(C`\-\-section\-header\*(C'\fR" 4
 289 .IX Item "--section-header"
 290 .Ip "\f(CW\*(C`\-\-header\*(C'\fR" 4
 291 .IX Item "--header"
 292 Display summary information from the section headers of the
 293 object file.
 294 .Sp
 295 File segments may be relocated to nonstandard addresses, for example by
 296 using the \fB\-Ttext\fR, \fB\-Tdata\fR, or \fB\-Tbss\fR options to
 297 \&\f(CW\*(C`ld\*(C'\fR.  However, some object file formats, such as a.out, do not
 298 store the starting address of the file segments.  In those situations,
 299 although \f(CW\*(C`ld\*(C'\fR relocates the sections correctly, using \fBobjdump
 300 \&\-h\fR to list the file section headers cannot show the correct addresses.
 301 Instead, it shows the usual addresses, which are implicit for the
 302 target.
 303 .Ip "\f(CW\*(C`\-\-help\*(C'\fR" 4
 304 .IX Item "--help"
 305 Print a summary of the options to \f(CW\*(C`objdump\*(C'\fR and exit.
 306 .Ip "\f(CW\*(C`\-i\*(C'\fR" 4
 307 .IX Item "-i"
 308 .Ip "\f(CW\*(C`\-\-info\*(C'\fR" 4
 309 .IX Item "--info"
 310 Display a list showing all architectures and object formats available
 311 for specification with \fB\-b\fR or \fB\-m\fR.
 312 .Ip "\f(CW\*(C`\-j \f(CIname\f(CW\*(C'\fR" 4
 313 .IX Item "-j name"
 314 .Ip "\f(CW\*(C`\-\-section=\f(CIname\f(CW\*(C'\fR" 4
 315 .IX Item "--section=name"
 316 Display information only for section \fIname\fR.
 317 .Ip "\f(CW\*(C`\-l\*(C'\fR" 4
 318 .IX Item "-l"
 319 .Ip "\f(CW\*(C`\-\-line\-numbers\*(C'\fR" 4
 320 .IX Item "--line-numbers"
 321 Label the display (using debugging information) with the filename and
 322 source line numbers corresponding to the object code or relocs shown.
 323 Only useful with \fB\-d\fR, \fB\-D\fR, or \fB\-r\fR.
 324 .Ip "\f(CW\*(C`\-m \f(CImachine\f(CW\*(C'\fR" 4
 325 .IX Item "-m machine"
 326 .Ip "\f(CW\*(C`\-\-architecture=\f(CImachine\f(CW\*(C'\fR" 4
 327 .IX Item "--architecture=machine"
 328 Specify the architecture to use when disassembling object files.  This
 329 can be useful when disassembling object files which do not describe
 330 architecture information, such as S-records.  You can list the available
 331 architectures with the \fB\-i\fR option.
 332 .Ip "\f(CW\*(C`\-M \f(CIoptions\f(CW\*(C'\fR" 4
 333 .IX Item "-M options"
 334 .Ip "\f(CW\*(C`\-\-disassembler\-options=\f(CIoptions\f(CW\*(C'\fR" 4
 335 .IX Item "--disassembler-options=options"
 336 Pass target specific information to the disassembler.  Only supported on
 337 some targets.
 338 .Sp
 339 If the target is an \s-1ARM\s0 architecture then this switch can be used to
 340 select which register name set is used during disassembler.  Specifying
 341 \&\fB\-M reg-name-std\fR (the default) will select the register names as
 342 used in \s-1ARM\s0's instruction set documentation, but with register 13 called
 343 \&'sp', register 14 called 'lr' and register 15 called 'pc'.  Specifying
 344 \&\fB\-M reg-names-apcs\fR will select the name set used by the \s-1ARM\s0
 345 Procedure Call Standard, whilst specifying \fB\-M reg-names-raw\fR will
 346 just use \fBr\fR followed by the register number.
 347 .Sp
 348 There are also two variants on the \s-1APCS\s0 register naming scheme enabled
 349 by \fB\-M reg-names-atpcs\fR and \fB\-M reg-names-special-atpcs\fR which
 350 use the ARM/Thumb Procedure Call Standard naming conventions.  (Eiuther
 351 with the normal register name sor the special register names).
 352 .Sp
 353 This option can also be used for \s-1ARM\s0 architectures to force the
 354 disassembler to interpret all instructions as \s-1THUMB\s0 instructions by
 355 using the switch \fB\*(--disassembler-options=force-thumb\fR.  This can be
 356 useful when attempting to disassemble thumb code produced by other
 357 compilers.
 358 .Ip "\f(CW\*(C`\-p\*(C'\fR" 4
 359 .IX Item "-p"
 360 .Ip "\f(CW\*(C`\-\-private\-headers\*(C'\fR" 4
 361 .IX Item "--private-headers"
 362 Print information that is specific to the object file format.  The exact
 363 information printed depends upon the object file format.  For some
 364 object file formats, no additional information is printed.
 365 .Ip "\f(CW\*(C`\-r\*(C'\fR" 4
 366 .IX Item "-r"
 367 .Ip "\f(CW\*(C`\-\-reloc\*(C'\fR" 4
 368 .IX Item "--reloc"
 369 Print the relocation entries of the file.  If used with \fB\-d\fR or
 370 \&\fB\-D\fR, the relocations are printed interspersed with the
 371 disassembly.
 372 .Ip "\f(CW\*(C`\-R\*(C'\fR" 4
 373 .IX Item "-R"
 374 .Ip "\f(CW\*(C`\-\-dynamic\-reloc\*(C'\fR" 4
 375 .IX Item "--dynamic-reloc"
 376 Print the dynamic relocation entries of the file.  This is only
 377 meaningful for dynamic objects, such as certain types of shared
 378 libraries.
 379 .Ip "\f(CW\*(C`\-s\*(C'\fR" 4
 380 .IX Item "-s"
 381 .Ip "\f(CW\*(C`\-\-full\-contents\*(C'\fR" 4
 382 .IX Item "--full-contents"
 383 Display the full contents of any sections requested.
 384 .Ip "\f(CW\*(C`\-S\*(C'\fR" 4
 385 .IX Item "-S"
 386 .Ip "\f(CW\*(C`\-\-source\*(C'\fR" 4
 387 .IX Item "--source"
 388 Display source code intermixed with disassembly, if possible.  Implies
 389 \&\fB\-d\fR.
 390 .Ip "\f(CW\*(C`\-\-show\-raw\-insn\*(C'\fR" 4
 391 .IX Item "--show-raw-insn"
 392 When disassembling instructions, print the instruction in hex as well as
 393 in symbolic form.  This is the default except when
 394 \&\f(CW\*(C`\-\-prefix\-addresses\*(C'\fR is used.
 395 .Ip "\f(CW\*(C`\-\-no\-show\-raw\-insn\*(C'\fR" 4
 396 .IX Item "--no-show-raw-insn"
 397 When disassembling instructions, do not print the instruction bytes.
 398 This is the default when \f(CW\*(C`\-\-prefix\-addresses\*(C'\fR is used.
 399 .Ip "\f(CW\*(C`\-G\*(C'\fR" 4
 400 .IX Item "-G"
 401 .Ip "\f(CW\*(C`\-\-stabs\*(C'\fR" 4
 402 .IX Item "--stabs"
 403 Display the full contents of any sections requested.  Display the
 404 contents of the .stab and .stab.index and .stab.excl sections from an
 405 \&\s-1ELF\s0 file.  This is only useful on systems (such as Solaris 2.0) in which
 406 \&\f(CW\*(C`.stab\*(C'\fR debugging symbol-table entries are carried in an \s-1ELF\s0
 407 section.  In most other file formats, debugging symbol-table entries are
 408 interleaved with linkage symbols, and are visible in the \fB\*(--syms\fR
 409 output.
 410 .Ip "\f(CW\*(C`\-\-start\-address=\f(CIaddress\f(CW\*(C'\fR" 4
 411 .IX Item "--start-address=address"
 412 Start displaying data at the specified address.  This affects the output
 413 of the \f(CW\*(C`\-d\*(C'\fR, \f(CW\*(C`\-r\*(C'\fR and \f(CW\*(C`\-s\*(C'\fR options.
 414 .Ip "\f(CW\*(C`\-\-stop\-address=\f(CIaddress\f(CW\*(C'\fR" 4
 415 .IX Item "--stop-address=address"
 416 Stop displaying data at the specified address.  This affects the output
 417 of the \f(CW\*(C`\-d\*(C'\fR, \f(CW\*(C`\-r\*(C'\fR and \f(CW\*(C`\-s\*(C'\fR options.
 418 .Ip "\f(CW\*(C`\-t\*(C'\fR" 4
 419 .IX Item "-t"
 420 .Ip "\f(CW\*(C`\-\-syms\*(C'\fR" 4
 421 .IX Item "--syms"
 422 Print the symbol table entries of the file.
 423 This is similar to the information provided by the \fBnm\fR program.
 424 .Ip "\f(CW\*(C`\-T\*(C'\fR" 4
 425 .IX Item "-T"
 426 .Ip "\f(CW\*(C`\-\-dynamic\-syms\*(C'\fR" 4
 427 .IX Item "--dynamic-syms"
 428 Print the dynamic symbol table entries of the file.  This is only
 429 meaningful for dynamic objects, such as certain types of shared
 430 libraries.  This is similar to the information provided by the \fBnm\fR
 431 program when given the \fB\-D\fR (\fB\*(--dynamic\fR) option.
 432 .Ip "\f(CW\*(C`\-\-version\*(C'\fR" 4
 433 .IX Item "--version"
 434 Print the version number of \f(CW\*(C`objdump\*(C'\fR and exit.
 435 .Ip "\f(CW\*(C`\-x\*(C'\fR" 4
 436 .IX Item "-x"
 437 .Ip "\f(CW\*(C`\-\-all\-header\*(C'\fR" 4
 438 .IX Item "--all-header"
 439 Display all available header information, including the symbol table and
 440 relocation entries.  Using \fB\-x\fR is equivalent to specifying all of
 441 \&\fB\-a \-f \-h \-r \-t\fR.
 442 .Ip "\f(CW\*(C`\-w\*(C'\fR" 4
 443 .IX Item "-w"
 444 .Ip "\f(CW\*(C`\-\-wide\*(C'\fR" 4
 445 .IX Item "--wide"
 446 Format some lines for output devices that have more than 80 columns.
 447 .SH "SEE ALSO"
 448 .IX Header "SEE ALSO"
 449 \&\fInm\fR\|(1), \fIreadelf\fR\|(1), and the Info entries for \fIbinutils\fR.
 450 .SH "COPYRIGHT"
 451 .IX Header "COPYRIGHT"
 452 Copyright (c) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001 Free Software Foundation, Inc.
 453 .PP
 454 Permission is granted to copy, distribute and/or modify this document
 455 under the terms of the \s-1GNU\s0 Free Documentation License, Version 1.1
 456 or any later version published by the Free Software Foundation;
 457 with no Invariant Sections, with no Front-Cover Texts, and with no
 458 Back-Cover Texts.  A copy of the license is included in the
 459 section entitled \*(L"\s-1GNU\s0 Free Documentation License\*(R".