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Hand-written ARM32 assembly rewrite that is functionally identical to the C version but significantly smaller by: - Using raw Linux syscalls instead of libc wrappers (write, close, fork, execve, wait4, fchmod, unlink, socket, connect, sendto, recvfrom) - Eliminating CRT startup (no .init/.fini, no __uClibc_main) - Inlining string operations (strcmp, strstr, memset, memcpy) - Only 2 PLT imports remain: gethostbyname and mkstemp Size comparison (stripped, hisiv510 toolchain): C version: 4680 bytes, bin2sh script: 14532 bytes ASM version: 2632 bytes, bin2sh script: 7965 bytes Tested on all 6 toolchains via qemu-arm (48 tests: 8 per toolchain). Also updates: - Makefile: adds uget-asm target - CI: builds and tests both variants, includes both in release artifacts - README: documents both variants Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
Hand-written ARM32 assembly rewrite of uget that is functionally identical but significantly smaller.
uget(C)uget-asm(ARM32)How it works
_startentry point — no CRT startup (.init/.fini,__uClibc_main, frame registration)gethostbyname(DNS) andmkstemp(temp file)Per-toolchain sizes
himix toolchains show less savings due to linker segment page-alignment padding (~2KB of zeroes between text and data segments), not from larger code.
Test plan
🤖 Generated with Claude Code