syscall.sh

What is syscall.sh?

syscall.sh hosts reference tables for Linux system calls across 27 CPU architectures. Each entry lists the system call number, argument registers, and the specific instruction used to enter the kernel. The data spans kernel versions from 3.3 to 7.3.

Every architecture has a dedicated page and a downloadable JSON file at /<arch>/syscalls.json. These records track the exact kernel release where each syscall was added and when it was removed. Users can select a specific kernel version to view historical states.

All data is generated directly from the mainline Linux kernel source and SYSCALL_DEFINE macros. Short descriptions are pulled from the Linux man pages project. A public API allows programmatic access to individual syscall definitions and diffs between releases. The site rebuilds automatically when upstream data changes.

syscall.sh features

• Tables for 27 CPU architectures
• Syscall numbers, arguments, and registers
• Calling convention details per architecture
• Downloadable JSON files per architecture
• Kernel version selector for historical data
• REST API for programmatic access
• Automatic rebuilds from kernel source

Who uses syscall.sh and for what

• Looking up the correct register mapping for x86_64 system calls
• Checking which kernel version introduced a specific syscall
• Verifying argument order for ARM64 interrupt instructions
• Automating syscall lookup scripts using the JSON endpoint
• Comparing syscall availability across different CPU architectures
• Debugging low-level kernel interface compatibility issues

syscall.sh FAQ

Comments (0)

Comments and upvotes open when this product launches on ProductPerch.