15 Aug
2023
15 Aug
'23
2:35 p.m.
On Tue, 2023-08-15 at 11:01 +0800, Leon Hwang wrote: [...]
a) Initial value of RAX is in emit_prologue(). if (!ebpf_from_cbpf) { if (tail_call_reachable && !is_subprog) /* When it's the entry of the whole * tailcall context, zeroing the RAX * means init tail_call_cnt. */ EMIT2(0x31, 0xC0); /* xor eax, eax */ else // Keep the same asm layout. EMIT2(0x66, 0x90); /* nop2 */ } I'd like to add this comment to emit_prologue().
Got it, thank you.
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