Cross-compilation for STM32F407xx : Actuated Robots
Embedded tutorial covering cross-compilation process for an embedded application running on stm32f407 microcontroller with GNU ARM Embedded Toolchain| Actuated Robots
Alignment refers to the practice of placing data or code at memory addresses that are multiples of a specific value, typically a power of 2. This is typically done to meet the requirements of the prog| MaskRay
LLVM 19 will be released. As usual, I maintain lld/ELF and have added some notes to https://github.com/llvm/llvm-project/blob/release/19.x/lld/docs/ReleaseNotes.rst. I've meticulously reviewed nearly| MaskRay
This article describes ELF interposition, the linker option -Bsymbolic, and its friends. In the end, it will discuss an ambitious plan which I dubbed "the Last Alliance of ELF and Men". Motivated by a| MaskRay
Updated in 2024-01. Branch target Many architectures encode a branch/jump/call instruction with PC-relative addressing, i.e. the distance to the target is encoded in the instruction. In an executable| MaskRay
Updated in 2025-05. Symbol address In an executable or shared object (called a component in ELF), a text section may need the absolute virtual address of a symbol (e.g. a function or a variable). The| MaskRay
LLVM 20 will be released. As usual, I maintain lld/ELF and have added some notes to https://github.com/llvm/llvm-project/blob/release/20.x/lld/docs/ReleaseNotes.rst. I've meticulously reviewed nearly all the patches that are not authored by me. I'll delve into some of the key changes.| MaskRay
Static vs dynamic linking usually has to do with our tolerance for the size of our final executable. A static executable contains all code necessary to run the executable, so the operating system loads the executable into memory, and it’s off to the races. However, if we keep duplicating code over and over again, such as printf, then it starts to use up more and more space. So, a dynamic executable means that we only store stubs in the executable. Whenever we want to access printf, it goes ...| Stephen Marz
An error in the make file with an easy fix. Continue Reading → The post OCI Demo Linking Error appeared first on All-round Database Topics.| All-round Database Topics
Updated in 2024-02. (In celebration of my 2800th llvm-project commit) Happy Halloween! This article describes relative relocations and how the RELR format can greatly decrease file sizes. An ELF linke| MaskRay
This article introduces CREL (previously known as RELLEB), a new relocation format offering incredible size reduction (LLVM implementation in my fork). ELF's design emphasizes natural size and alignme| MaskRay
This article describes ABI and toolchain considerations about systems without a Memory Management Unit (MMU). We will focus on FDPIC and the in-development FDPIC ABI for RISC-V, with updates as I delv| MaskRay
LLVM 18 will be released. As usual, I maintain lld/ELF and have added some notes to https://github.com/llvm/llvm-project/blob/release/18.x/lld/docs/ReleaseNotes.rst. I've meticulously reviewed nearly| MaskRay
This article describes some notes about z/Architecture with a focus on the ELF ABI and ELF linkers. An lld/ELF patch sparked my motivation to study the architecture and write this post. z/Architecture| MaskRay
My journey with the LLVM project began with a deep dive into the world of lld and binary utilities. Countless hours were spent unraveling the intricacies of object file formats and shaping LLVM's rele| MaskRay
Embedded tutorial covering cross-compilation process for an embedded application running on stm32f407 microcontroller with GNU ARM Embedded Toolchain| Actuated Robots
This article describes SHF_ALLOC|SHF_COMPRESSED sections in ELF and lld's linker option --compress-sections to compress arbitrary sections.| MaskRay
Updated in 2023-11. For a user who only uses one C++ standard library, such as libc++, there are typically three compatibility goals, each with increasing compatibility requirements: Can the program,| MaskRay
I do not use Apple products myself, but I sometimes delve into Mach-O due to my interest in object file formats. Additionally, my LLVM/Clang changes sometimes require some understanding of Mach-O. Occ| MaskRay
When linking an oversized executable, it is possible to encounter errors such as relocation truncated to fit: R_X86_64_PC32 against `.text' (GNU ld) or relocation R_X86_64_PC32 out of range (ld.lld).| MaskRay
UNDER CONSTRUCTION This article describes target-specific details about AArch32 in ELF linkers. I described AArch64 in a previous article. AArch32 is the 32-bit execution state for the Arm architectur| MaskRay
This article describes an interesting overflow bug in the ELF hash function. The System V Application Binary Interface (generic ABI) specifies the ELF object file format. When producing an executable| MaskRay
This article describes target-specific details about AArch64 in ELF linkers. AArch64 is the 64-bit execution state for the Arm architecture. The AArch64 execution state runs the A64 instruction set. T| MaskRay
This article describes target-specific details about Power ISA in ELF linkers. Initially there was IBM POWER. The 1991 Apple–IBM–Motorola alliance created PowerPC. In 2006, the architecture was rebran| MaskRay
