one-elf | ELF reader in Java
kandi X-RAY | one-elf Summary
kandi X-RAY | one-elf Summary
ELF reader in Java.
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- Returns an iterator over all symbols in this set
- Read a string at the given index
- Gets the symbol with the given name
- Returns link
- Returns a string representation of this symbol
- Get the integer type
- Gets the symbol
- Returns a string representation of the address
- Get the type of the directory
- Get the number of elements
- Returns a string representation of this object
- Returns the column name
- Read directory types
- Instantiates a new directory
- Returns a string representation of this virtual address
- The name of the field
- Get the relocations
- Region relocation
- Reads a list of sections
- Reads a section
- Returns the byte order for the buffer
- Reads a name from the buffer
- Returns a string representation of this attribute
- Return an array of all the symbols
- Iterates over the set of relocations
- Returns a section with the given name
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QUESTION
I'm trying to learn assembly through compiling Rust. I have found a way to compile Rust code to binary machine code and be able to objdump
it to view the assembly. However if I write the following:
ANSWER
Answered 2022-Mar-11 at 12:38There is one compiler pass before the generation of LLVM-IR, which is the generation of MIR, the Rust intermediate representation. If you emit this for the given code with a command such as this one:
QUESTION
I was debugging linux boot and tried to understand how these percpu
variables work in arm64. For test, I added a function called read_pkcontext1
which returns the percpu variable printk_context
. (This value is used for printk) And I found something I can't understand.
(this is from linux 5.4.21)
ANSWER
Answered 2022-Feb-11 at 12:21this_cpu_read(printk_context)
expands to:
⇒ __pcpu_size_call_return(this_cpu_read_, printk_context)
⇒
QUESTION
I am doing baremetal development on ARM and emulating Raspi 3 on QEMU. Below is my minimal assembly code :
...ANSWER
Answered 2022-Jan-06 at 10:11The QEMU -kernel option treats the file it loads differently depending on whether it is an ELF file or not.
If it is an ELF file, it is loaded according to what the ELF file says it should be loaded as, and started by executing from the ELF entry point. If it is not an ELF file, it is assumed to be a Linux kernel, and started in the way that the Linux kernel's booting protocol requires.
In particular, for a multi-core board, if -kernel gets an ELF file it starts all the cores at once at the entry point. If it gets a non-ELF file then it will do whatever that hardware is supposed to do for loading a Linux kernel. For raspi3b this means emulating the firmware behaviour of "secondary cores sit in a loop waiting for the primary core to release them by writing to a 'mailbox' address. This is the behaviour you're seeing in gdb -- the 0x300 address that cores 1-3 are at is in the "spin in a loop waiting" code.
In general, unless your guest code is a Linux kernel or is expecting to be booted in the same way as a Linux kernel, don't use the -kernel option to load it. -kernel is specifically "try to do what Linux kernels want", and it also tends to have a lot of legacy "this seemed like a useful thing to somebody" behaviour that differs from board to board or between different guest CPU architectures. The "generic loader" is a good way to load ELF files if you want complete manual control for "bare metal" work.
For more info on the various QEMU options for loading guest code, see this answer.
QUESTION
I am learning baremetal development on ARM, for which I chose to simulate Raspi3 on QEMU. Hence, its a virtual ARM Cortex A-53 imlementing ARMv8 architecture. I have compiled the following simple baremetal code :
...ANSWER
Answered 2022-Jan-05 at 05:15You probably have an issue with the versions of gdb
or qemu
you are using, since I was not able to reproduce your problem with a version 10.1 of aarch64-elf-gdb and a version 6.2.0 of qemu-system-aarch64 compiled from scratch on an Ubuntu 20.04.3 LTS
system:
wfe.s
:
QUESTION
Often a question leads me into another question.
While trying to debug an inline assembly code, I met with another basic problem.
To make long story short, I want to run arm64 baremetal hello world program on qemu.
ANSWER
Answered 2021-Dec-10 at 11:05When you build a program for "bare metal" that means that you need to configure your toolchain to produce a binary that works on the specific piece of bare metal that you try to run it on. For instance, the binary must:
- put its code somewhere in the machine's memory map where there is either ROM or RAM
- put its data where there is RAM
- make sure that on startup the stack pointer is correctly initialized to point into RAM
- if it wants to print output, include routines which access a suitable device on that machine. This is likely a serial port, and serial ports are often entirely different devices, located at different addresses, on different machines
If any of these things are wrong or don't match the actual machine you run on, the result is typically exactly what you see -- the program crashes without output.
More specifically, rdimon.specs tells the compiler to build in C library functions which do some of this via the "semihosting" debugger ABI (which has support for "print string" and some other things). Your QEMU command line doesn't enable implementation of semihosting (you can turn it on with the -semihosting option), so that won't work at all. But there are probably other problems you're also hitting.
QUESTION
Im compiling a program I made using make
and I get this error
ANSWER
Answered 2021-Nov-28 at 08:16In my case, c++ was the g++ compiler instead of the clang compiler, if you are having a similar issue try updating g++ or clang++(on older macs you may need to have to use brew to install those) or going in your /usr/bin directory(for mac and linux, I never used windows cant help you) and replacing the files(though only do that if you absolutely know what your doing!).
QUESTION
I'm trying to build u-boot for our simple test board. (arm64)
After setting in include/configs/ab21m.h (our board),
ANSWER
Answered 2021-Nov-17 at 12:49So, your first problem is a literal one. You have SZ_32K
as the value for CONFIG_SPL_BSS_MAX_SIZE
but since you're likely lacking #include
in include/configs/ab21m.h you're not getting that constant evaluated.
As for what this is all doing, and why you should likely use something more like 2MB as seen on other platforms and place it in SDRAM rather than much smaller on-chip memory, if you look at arch/arm/cpu/armv8/u-boot-spl.lds you can see we're defining where the BSS should reside and that's likely larger than 32KB (and you'll get an overflow error when linking, if so).
QUESTION
To understand how SPL (secondary boot loader), I tried (in u-boot v2021.10)
...ANSWER
Answered 2021-Nov-15 at 14:15Kconfig in general can be difficult to follow (and a few things in how we use it in U-Boot need to be cleaned up as it makes things harder still to follow). It's often best to look at the Kconfig files directly, to better understand things. In this case as you've noted, SPL_OS_BOOT
depends on SPL
and if we look in common/spl/Kconfig we see:
QUESTION
I'm looking into creating my own OS for a hobby/learning purpose.
I have created a simple rust program but cannot get it to start with QEMU. My rust code is shown below.
...ANSWER
Answered 2021-Sep-07 at 10:34QEMU has probably decided that your ELF file isn't the right format and fallen back to "assume this is a raw binary". If you want to debug what's going wrong you could run QEMU under gdb and look at the code path taken starting with the riscv_load_kernel() function.
More generally, though, '-kernel' behaviour in QEMU is architecture-dependent, but mostly is designed for "boot a Linux kernel". So if you're definitely building your custom OS to match the image format and boot protocol that Linux uses, then it's the right option. If you're just building a random ELF file and want to have QEMU start from its entry point, though, you might find the generic loader a better fit.
QUESTION
I am working on bare metal programming for a Raspberry Pi 3. I have been able to blink a light using a tutorial and I am now trying to do the same in Rust.
My project contains the following files:
main.rs
ANSWER
Answered 2021-Jul-29 at 15:52It turns out that the issue was in my arch.json
file, which I was using to specify the architecture and tooling for the compiler. Changing the linker and llvm target to arm-none-eabihf
fixed this issue:
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