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- ## Copyright (C) 2016 Jeremiah Orians
- ## This file is part of M2-Planet.
- ##
- ## M2-Planet is free software: you can redistribute it and/or modify
- ## it under the terms of the GNU General Public License as published by
- ## the Free Software Foundation, either version 3 of the License, or
- ## (at your option) any later version.
- ##
- ## M2-Planet is distributed in the hope that it will be useful,
- ## but WITHOUT ANY WARRANTY; without even the implied warranty of
- ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- ## GNU General Public License for more details.
- ##
- ## You should have received a copy of the GNU General Public License
- ## along with M2-Planet. If not, see <http://www.gnu.org/licenses/>.
- :_start
- mov_rbp,rsp ; Protect rsp
- ;; Prepare argv
- lea_rax,[rbp+DWORD] %8 ; ARGV_address = RBP + 8
- push_rax ; Put argv on the stack
- ;; Prepare envp
- mov_rax,rbp ; Address we need to load from
- mov_rax,[rax] ; Get ARGC
- add_rax, %2 ; OFFSET = ARGC + 2
- sal_rax, !3 ; OFFSET = OFFSET * WORDSIZE
- add_rax,rbp ; ENVP_address = RSP + OFFSET
- push_rax ; Put envp on the stack
- ;; Stack offset
- add_rbp, %8 ; Fix rbp
- ;; Perform the main loop
- call %FUNCTION_main
- push_rax ; Put return value on the stack
- push_rax ; So that _exit gets it
- :FUNCTION_exit
- :FUNCTION__exit
- pop_rbx
- pop_rdi
- mov_rax, %0x3C
- syscall
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