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/GCC 11

6.60.12 BPF Built-in Functions

The following built-in functions are available for eBPF targets.

Built-in Function: unsigned long long __builtin_bpf_load_byte (unsigned long long offset)

Load a byte from the struct sk_buff packet data pointed by the register %r6 and return it.

Built-in Function: unsigned long long __builtin_bpf_load_half (unsigned long long offset)

Load 16-bits from the struct sk_buff packet data pointed by the register %r6 and return it.

Built-in Function: unsigned long long __builtin_bpf_load_word (unsigned long long offset)

Load 32-bits from the struct sk_buff packet data pointed by the register %r6 and return it.

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https://gcc.gnu.org/onlinedocs/gcc-11.1.0/gcc/BPF-Built_002din-Functions.html