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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
- COPY_rsp_to_rbp ; Protect rsp
- ;; Prepare argv
- LOAD_BASE_ADDRESS_rax %8 ; ARGV_address = RBP + 8
- PUSH_RAX ; Put argv on the stack
- ;; Prepare envp
- COPY_rbp_to_rax ; Address we need to load from
- LOAD_INTEGER ; Get ARGC
- ADD_IMMEDIATE_to_rax %2 ; OFFSET = ARGC + 2
- SAL_rax_Immediate8 !3 ; OFFSET = OFFSET * WORDSIZE
- ADD_rbp_to_rax ; ENVP_address = RSP + OFFSET
- PUSH_RAX ; Put envp on the stack
- ;; Stack offset
- ADD_IMMEDIATE_to_rbp %8 ; Fix rbp
- ;; Perform the main loop
- CALL_IMMEDIATE %FUNCTION_main
- ;; Exit to kernel
- COPY_rax_to_rdi ; Using the return code given by main
- LOAD_IMMEDIATE_rax %0x3C ; Syscall exit
- SYSCALL ; Exit with that code
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