refactor: avoid go:linkname to the stdlib

[aofei]

See https://go.dev/doc/go1.23#linker.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.38%. Comparing base (4b791d5) to head (2457775).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #127   +/-   ##
=======================================
  Coverage   90.38%   90.38%           
=======================================
  Files          10       10           
  Lines         104      104           
=======================================
  Hits           94       94           
  Misses         10       10           

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