Is there a reference to the source file in the binary? I tried running strings on the binary and couldn’t find any reference to the source file listed…
- Objdump For Mac Os 10.10
- Objdump For Mac Os 10.13
- Objdump For Mac Os High Sierra
- Objdump For Mac Os Versions
I want to get the source code of a small command line tool using objdump on Mac OS X. I've used arm-linux-objdump on Linux and find it a great tool. Is there any way to install objdump on OS X? I've searched Google and found information about arm-apple-dawin9-objdump, but failed to find anything to download. user@mach tmp$ as 1.s -o 1.o user@mach tmp$ objdump -D 1.o 1.o: file format elf64-x86-64 Disassembly of section.text: 000000: 0: 90 nop objdump: error: 1.o(.bss) section size (0x8000 bytes) is larger than file size (0x338 bytes) objdump: Reading section.bss failed because: memory exhausted Disassembly of section.text2.
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Answers:
Make sure you’re ready to upgrade. Before you upgrade, we recommend that you back up your Mac. Then, if your Mac is running OS X Mavericks 10.9 or later, you can upgrade directly to macOS Catalina. Mac OS X¶ PyInstaller runs in Mac OS X 10.7 (Lion) or newer. It can build graphical windowed apps (apps that do not use a terminal window). PyInstaller builds apps that are compatible with the Mac OS X release in which you run it, and following releases. It can build 32-bit binaries in Mac OS. Note that on certain platforms (e.g. Mac OS X), the objdump binary may actually be a link to llvm's objdump, with different command-line options and behavior. For example, $ objdump -D -M intel file.bin grep main.: -A20 This performs disassembly on the.
objdump
uses the DWARF debugging information compiled into the binary, which references the source file name. If the binary isn’t compiled with debugging information, or objdump
can’t find the source file, then you don’t get source code in your output – only assembly.You don’t see the source file name when you use
strings
on the binary, because DWARF uses compression.Answers:
The dwarf information in a binary stores the mapping between instructions(the instruction pointer or IP actually) and the source file and line number. The source file is specified using the complete path so it can be found even if the binary is moved around. To see this information you can use
objdump --dwarf=decodedline <binary>
(the binary ofcourse has to be compiled with -g
).Once you say
objdump -S <binary>
it use this dwarf info to give you source code along with the disassembly.Answers:
My understanding is that for
And by processing this DWARF information
objdump
to display source code from the binary code, there is a precondition: the DWARF debugging information must be compiled into the binary. (by gcc -g sourcefile
or gcc -gdwarf-2 sourcefile
)And by processing this DWARF information
objdump
is able to get the source code as @vlcekmi3 and @vkrnt answeredThis article provides instructions on how to build B2G OS for Flame devices using a Mac OS X system as your build platform.
Note: This guide assumes that you have the popular Homebrew package manager installed. If you do not, you should either install it or an equivalent package manager and learn how it works.
Preparing the build environment
The first step is to install build prerequisites as usual. Then install binutils, so that the
objdump
command is available for debug builds:Create a disk image using the case-sensitive, journaled HFS+ file system and mount the image using the following commands.
Note: Because the image has been created as a 'sparse' image, only disk blocks that are actually used take up physical space on your physical media. This means that a 40 gigabyte image, such as the one above, will not actually take up 40 gigabytes of space. Instead, it will gradually get larger as you write more and more data to it.
Just open the Terminal and type the following: ssh [email protected] ssh username@ipaddressReplace the username with the user name you are accessing with, while the hostname.domain.ext or ipaddress replace with the hostname or IP address. If you access using root user, just enter [email protected] or [email protected] you are using the Ubuntu operating system, you can install Open SSH using the following command: sudo apt install openssh-serverFor Apple Mac users, SSH comes by default, but SSH Deamon is turned off. You need to activate it using the following command: sudo systemsetup -setremotelogin onTo stop the SSH Daemon, you need to type the following: sudo systemsetup -setremotelogin offTo check SSH status, use the following: sudo systemsetup -getremotelogin Carefully with the SSH data and actions you want to applyIt is important to keep safe all your data for accessing your server. Do not allow your data to come into the possession of people who do not have a need to access and who can by accident or intentionally endanger your work. Linux server for mac and pc.
Clone the B2G repository
Of course, before you can start your first build, you need to clone the B2G repository. It's important to note that this doesn't fetch everything. It simply pulls down the build system and setup utilities. Most of the actual code is in Mozilla's main Mercurial repository; those files will be retrieved later in the setup process.
To clone the repository, use git:
After that's done (which should only take a minute with a fast connection),
cd
into the B2G directory:Configuring B2G for flame
Objdump For Mac Os 10.10
Once you've retrieved the core B2G build system, you need to configure it for the device on which you plan to install it; in this case, that's 'flame'. Run the following command from within the B2G directory:
It's at this point that the majority of the code will be downloaded. This is around 15 GB of source code, so it will take a long time, even if you have a fast Internet connection. Even with high-performance broadband, this can take an hour or so.
Note: Seriously, this will take a very long time if you're on a slow Internet connection. Keep that in mind (as well as any per-megabyte fees you may have to pay on your connection) before doing this step.
Objdump For Mac Os 10.13
Back up important device files
Before beginning the install process, it's important to make a backup of certain key files on the device. These will be needed if you ever need to re-flash the device.
At this point, connect your Flame if it isn't already connected; the configure process will need to access it. Use the
adb devices
command to check to see if it's connected:This will list any Android or B2G compatible devices that are connected. If yours isn't listed, something's not connected properly.
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Once the device is confirmed to be connected, you can make the backup using the following commands:
To note, if you are building for the first time, you will want to be on the latest version of the flame base image; see https://developer.mozilla.org/en-US/B2G_OS/Phone_guide/Flame/Updating_your_Flame#Full_flash_to_the_latest_base_image for more details.
Working around a Mac OS X build problem
There's a problem that can happen when building on Mac OS X. This is a solution devised by the Mozilla community; it has been tested on Mac OS X 10.9.4 'Mavericks.'
Non-existent mkfs.vfat
Objdump For Mac Os High Sierra
You need to install a port of
dosfstools
so you can use the image.Then edit the formula
brew
will use to build the dosfstools
software:Now you're ready to install it:
Changing configuration to work around bugs
There are some build system bugs that prevent building on Mac OS X under certain circumstances. Those circumstances are:
Objdump For Mac Os Versions
- Bug 1039223 - Build for flame fails complaining of missing dt.img
- Bug 1027682 - [Flame][Build] Failed to build on Mac OS X 10.9, elf.h file not found
Use your favorite text editor to create a file named
.userconfig
in the B2G directory. The following content should to into the .userconfig
file:Start your first build
Now you're finally ready to build! Just kick it off the way you do for any B2G OS build: