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v/vlib/os/bare/bare.S
2019-12-04 01:40:26 +03:00

40 lines
780 B
ArmAsm

.intel_syntax noprefix
.text
.globl _start, main__syscall5
_start:
xor rbp,rbp
pop rdi
mov rsi,rsp
and rsp,-16
call main
mov rdi,rax /* syscall param 1 = rax (ret value of main) */
mov rax,60 /* SYS_exit */
syscall
ret /* should never be reached, but if the OS somehow fails
to kill us, it will cause a segmentation fault */
main__syscall5:
mov rax,rdi
mov rdi,rsi
mov rsi,rdx
mov rdx,rcx
mov r10,r8
mov r8,r9
syscall
ret
main__syscall6:
mov rax,rdi
mov rdi,rsi
mov rsi,rdx
mov rdx,rcx
mov r10,r8
mov r8,r9
mov r9, [rsp+8]
syscall
ret