Sohu Tech Products
Jun 3, 2020 · Fundamentals
Understanding Linux System Call Mechanisms: Software Interrupts, Fast Syscall Instructions, and vDSO
Linux system calls provide the interface between user programs and the kernel, and this article explains the three implementation methods—software interrupts, fast syscall instructions (SYSENTER/SYSCALL), and the virtual dynamic shared object (vDSO)—detailing their operation, performance impact, and relevant assembly code examples.
Kernelassemblylinux
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