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A high-level comparison of in-kernel and kernel-to-userspace APIs and ABIs The Linux kernel and GNU C Library define the Linux API. After compilation, the binaries offer an ABI. Keeping this ABI stable over a long time is important for ISVs. In computer software, an application binary interface (ABI) is an interface between two binary program ...
The Linux API is composed out of the system call interface of the Linux kernel, the GNU C Library (by GNU), libcgroup, [1] libdrm, libalsa and libevdev [2] (by freedesktop.org). Linux API vs. POSIX API. The Linux API includes the kernel–user space API, which allows code in user space to access system resources and services of the Linux kernel ...
Full machine code compatibility would here imply exactly the same layout of interrupt service routines, I/O-ports, hardware registers, counter/timers, external interfaces and so on. For a more complex embedded system using more abstraction layers (sometimes on the border to a general computer, such as a mobile phone), this may be different.
An API opens a software system to interactions from the outside. It allows two software systems to communicate across a boundary — an interface — using mutually agreed-upon signals. [3] In other words, an API connects software entities together. Unlike a user interface, an API is typically not visible to users. It is an "under the hood ...
Calling conventions, type representations, and name mangling are all part of what is known as an application binary interface (ABI). There are subtle differences in how various compilers implement these conventions, so it is often difficult to interface code which is compiled by different compilers.
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The ABI allows programs to take advantage of the benefits of x86-64 instruction set (larger number of CPU registers, better floating-point performance, faster position-independent code, shared libraries, function parameters passed via registers, faster syscall instruction) while using 32-bit pointers and thus avoiding the overhead of 64-bit ...