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Computer systems

Systems programming

Program startup, memory, system calls and I/O.

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8 topics
01

ELF and Binary Formats

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  1. ELF File Format
  2. Dynamic Linking and ld.so
  3. Loading and Startup: From ELF Entry to main
02

System Call ABI

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  1. Linux x86-64 System Call ABI: Registers, SYSCALL, and RCX/R11
  2. ARM64 System Call ABI
  3. Anatomy of glibc Syscall Wrappers
03

Processes and Memory

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  1. Process Memory Layout
  2. Inside malloc: The glibc Allocator
  3. ASLR and Security Hardening
04

Signals and Exceptions

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  1. User-space Signal Handling
  2. ptrace and Debugging Interfaces
05

IO and File Systems

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  1. Buffered I/O (stdio)
  2. io_uring: Submission and Completion Model
  3. epoll and Event-Driven Programming
06

IPC and Synchronization

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  1. futex: Waiting and Waking for User-Space Locks
  2. Pipes and socketpair
  3. Shared Memory and Semaphores
07

Toolchain and Compilation

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  1. GCC and Clang Internals
  2. Linker Scripts and Relocation
  3. Make / CMake / Meson Build Systems
08

Performance and Debugging

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  1. Deep Dive into perf
  2. Valgrind and Sanitizers in Practice
  3. User-space Tracing with ftrace and bpftrace
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