BITS 64 default rel extern zest_cfi_dispatch_c section .text global zest_cfi_dispatch:function zest_cfi_dispatch: ; not saving rbx, rsp, rbp, r12-r15 as C code should save them. lea rsp, [rsp-128] pushf push rax push rcx push rdx push rsi push rdi push r8 push r9 push r10 push r11 mov rdi, r11 ; r11 is the cfi reg for x86-64, copy it to rdi for C-calling convention. call zest_cfi_dispatch_c wrt ..plt pop r11 pop r10 pop r9 pop r8 pop rdi pop rsi pop rdx pop rcx pop rax popf lea rsp, [rsp+128] ret