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Manual Pages  — LLVM-OBJDUMP

NAME

llvm-objdump - LLVM's object file dumper

CONTENTS

SYNOPSIS

llvm-objdump [commands] [options] [filenames...]

DESCRIPTION

The llvm-objdump utility prints the contents of object files and final linked images named on the command line. If no file name is specified, llvm-objdump will attempt to read from a.outamp;. If - is used as a file name, llvm-objdump will process a file on its standard input stream.

COMMANDS

At least one of the following commands are required, and some commands can be combined with other commands:
-a, --archive-headers
  Display the information contained within an archiveaqs headers.
-d, --disassemble
  Disassemble all executable sections found in the input files. On some architectures (AArch64, PPC64, x86), all known instructions are disassembled by default. On the others,  --mcpu or  --mattr is needed to enable some instruction sets. Disabled instructions are displayed as <unknown>amp;.
-D, --disassemble-all
  Disassemble all sections found in the input files.
--disassemble-symbols=<symbol1[,symbol2,...]>
  Disassemble only the specified symbols. Takes demangled symbol names when  --demangle is specified, otherwise takes mangled symbol names. Implies  --disassembleamp;.
--dwarf=<value>
  Dump the specified DWARF debug sections. The supported values are:

frames - .debug_frame

-f, --file-headers
  Display the contents of the overall file header.
--fault-map-section
  Display the content of the fault map section.
-h, --headers, --section-headers
  Display summaries of the headers for each section.
--help Display usage information and exit. Does not stack with other commands.
-p, --private-headers
  Display format-specific file headers.
-r, --reloc
  Display the relocation entries in the file.
-R, --dynamic-reloc
  Display the dynamic relocation entries in the file.
--raw-clang-ast
  Dump the raw binary contents of the clang AST section.
-s, --full-contents
  Display the contents of each section.
-t, --syms Display the symbol table.
-T, --dynamic-syms
  Display the contents of the dynamic symbol table.
-u, --unwind-info
  Display the unwind info of the input(s).

This operation is only currently supported for COFF and Mach-O object files.

-v, --version
  Display the version of the llvm-objdump executable. Does not stack with other commands.
-x, --all-headers
  Display all available header information. Equivalent to specifying  --archive-headers,  --file-headers,  --private-headers,  --reloc,  --section-headers, and  --symsamp;.

OPTIONS

llvm-objdump supports the following options:
--adjust-vma=<offset>
  Increase the displayed address in disassembly or section header printing by the specified offset.
--arch-name=<string>
  Specify the target architecture when disassembling. Use  --version for a list of available targets.
--build-id=<string>
  Look up the object using the given build ID, specified as a hexadecimal string. The found object is handled as if it were an input filename.
-C, --demangle
  Demangle symbol names in the output.
--debug-file-directory <path>
  Provide a path to a directory with a amp;.build-id subdirectory to search for debug information for stripped binaries. Multiple instances of this argument are searched in the order given.
--debuginfod, --no-debuginfod
  Whether or not to try debuginfod lookups for debug binaries. Unless specified, debuginfod is only enabled if libcurl was compiled in (LLVM_ENABLE_CURL) and at least one server URL was provided by the environment variable DEBUGINFOD_URLSamp;.
--debug-vars=<format>
  Print the locations (in registers or memory) of source-level variables alongside disassembly. format may be unicode or ascii, defaulting to unicode if omitted.
--debug-vars-indent=<width>
  Distance to indent the source-level variable display, relative to the start of the disassembly. Defaults to 52 characters.
-j, --section=<section1[,section2,...]>
  Perform commands on the specified sections only. For Mach-O use segment,section to specify the section name.
-l, --line-numbers
  When disassembling, display source line numbers. Implies  --disassembleamp;.
-M, --disassembler-options=<opt1[,opt2,...]>
  Pass target-specific disassembler options. Available options:
&#187; reg-names-std: ARM only (default). Print in ARM aqs instruction set documentation, with r13/r14/r15 replaced by sp/lr/pc.
&#187; reg-names-raw: ARM only. Use r followed by the register number.
&#187; no-aliases: AArch64 and RISC-V only. Print raw instruction mnemonic instead of pseudo instruction mnemonic.
&#187; numeric: RISC-V only. Print raw register names instead of ABI mnemonic. (e.g. print x1 instead of ra)
&#187; att: x86 only (default). Print in the AT&T syntax.
&#187; intel: x86 only. Print in the intel syntax.
--mcpu=<cpu-name>
  Target a specific CPU type for disassembly. Specify --mcpu=help to display available CPUs.
--mattr=<a1,+a2,-a3,...>
  Enable/disable target-specific attributes. Specify --mattr=help to display the available attributes.
--no-leading-addr, --no-addresses
  When disassembling, do not print leading addresses for instructions or inline relocations.
--no-print-imm-hex
  Do not use hex format for immediate values in disassembly output.
--no-show-raw-insn
  When disassembling, do not print the raw bytes of each instruction.
--offloading
  Display the content of the LLVM offloading section.
--prefix=<prefix>
  When disassembling with the  --source option, prepend prefix to absolute paths.
--prefix-strip=<level>
  When disassembling with the  --source option, strip out level initial directories from absolute paths. This option has no effect without  --prefixamp;.
--print-imm-hex
  Use hex format when printing immediate values in disassembly output (default).
-S, --source
  When disassembling, display source interleaved with the disassembly. Implies  --disassembleamp;.
--show-all-symbols
  Show all symbols during disassembly, even if multiple symbols are defined at the same location.
--show-lma
  Display the LMA column when dumping ELF section headers. Defaults to off unless any section has different VMA and LMAs.
--start-address=<address>
  When disassembling, only disassemble from the specified address.

When printing relocations, only print the relocations patching offsets from at least addressamp;.

When printing symbols, only print symbols with a value of at least addressamp;.

--stop-address=<address>
  When disassembling, only disassemble up to, but not including the specified address.

When printing relocations, only print the relocations patching offsets up to addressamp;.

When printing symbols, only print symbols with a value up to addressamp;.

--symbolize-operands
  When disassembling, symbolize a branch target operand to print a label instead of a real address.

When printing a PC-relative global symbol reference, print it as an offset from the leading symbol.

When a bb-address-map section is present (i.e., the object file is built with -fbasic-block-sections=labels), labels are retrieved from that section instead.

Only works with PowerPC objects or X86 linked images.

Example:
  A non-symbolized branch instruction with a local target and pc-relative memory access like

cmp eax, dword ptr [rip + 4112]
jge 0x20117e <_start+0x25>

might become

<L0>:
  cmp eax, dword ptr <g>
  jge      <L0>
--triple=<string>
  Target triple to disassemble for, see --version for available targets.
-w, --wide Ignored for compatibility with GNU objdump.
--x86-asm-syntax=<style>
  Deprecated. When used with  --disassemble, choose style of code to emit from X86 backend. Supported values are:
att AT&T-style assembly
intel Intel-style assembly

The default disassembly style is attamp;.
-z, --disassemble-zeroes
  Do not skip blocks of zeroes when disassembling.
@<FILE> Read command-line options and commands from response file <FILE>amp;.

MACH-O ONLY OPTIONS AND COMMANDS

--arch=<architecture>
  Specify the architecture to disassemble. see --version for available architectures.
--archive-member-offsets
  Print the offset to each archive member for Mach-O archives (requires  --archive-headers).
--bind Display binding info
--data-in-code
  Display the data in code table.
--dis-symname=<name>
  Disassemble just the specified symbolaqs instructions.
--chained-fixups
  Print chained fixup information.
--dyld-info
  Print bind and rebase information used by dyld to resolve external references in a final linked binary.
--dylibs-used
  Display the shared libraries used for linked files.
--dsym=<string>
  Use .dSYM file for debug info.
--dylib-id
  Display the shared libraryaqs ID for dylib files.
--exports-trie
  Display exported symbols.
--function-starts [=<addrs|names|both>]
  Print the function starts table for Mach-O objects. Either addrs (default) to print only the addresses of functions, names to print only the names of the functions (when available), or both to print the names beside the addresses.
-g Print line information from debug info if available.
--full-leading-addr
  Print the full leading address when disassembling.
--indirect-symbols
  Display the indirect symbol table.
--info-plist
  Display the info plist section as strings.
--lazy-bind
  Display lazy binding info.
--link-opt-hints
  Display the linker optimization hints.
-m, --macho
  Use Mach-O specific object file parser. Commands and other options may behave differently when used with --machoamp;.
--no-leading-headers
  Do not print any leading headers.
--no-symbolic-operands
  Do not print symbolic operands when disassembling.
--non-verbose
  Display the information for Mach-O objects in non-verbose or numeric form.
--objc-meta-data
  Display the Objective-C runtime meta data.
--private-header
  Display only the first format specific file header.
--rebase
  Display rebasing information.
--rpaths
  Display runtime search paths for the binary.
--universal-headers
  Display universal headers.
--weak-bind
  Display weak binding information.

XCOFF ONLY OPTIONS AND COMMANDS

--symbol-description
  Add symbol description to disassembly output.

BUGS

To report bugs, please visit < https://github.com/llvm/llvm-project/labels/tools:llvm-objdump/>.

SEE ALSO

llvm-nm(1), llvm-otool(1), llvm-readelf(1), llvm-readobj(1)

AUTHOR

Maintained by the LLVM Team (https://llvm.org/).

COPYRIGHT

2003-2023, LLVM Project

2023-05-24 LLVM-OBJDUMP (1) 16

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