llvm-objdump - LLVM’s object file dumper

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.out. 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 archive’s 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>.

-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 --disassemble.

--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 --syms.

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 .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_URLS.

--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 --disassemble.

-M, --disassembler-options=<opt1[,opt2,...]>

Pass target-specific disassembler options. Available options:

  • reg-names-std: ARM only (default). Print in ARM ‘s instruction set documentation, with r13/r14/r15 replaced by sp/lr/pc.

  • reg-names-raw: ARM only. Use r followed by the register number.

  • no-aliases: AArch64 and RISC-V only. Print raw instruction mnemonic instead of pseudo instruction mnemonic.

  • numeric: RISC-V only. Print raw register names instead of ABI mnemonic. (e.g. print x1 instead of ra)

  • att: x86 only (default). Print in the AT&T syntax.

  • 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 --prefix.

--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 --disassemble.

--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 address.

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

--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 address.

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

--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 att.

-z, --disassemble-zeroes

Do not skip blocks of zeroes when disassembling.

@<FILE>

Read command-line options and commands from response file <FILE>.

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 symbol’s 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 library’s 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.

Display the linker optimization hints.

-m, --macho

Use Mach-O specific object file parser. Commands and other options may behave differently when used with --macho.

--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.