43 lines
1.5 KiB
Plaintext
43 lines
1.5 KiB
Plaintext
## Copyright (C) 2016 Jeremiah Orians
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## This file is part of M2-Planet.
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##
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## M2-Planet is free software: you can redistribute it and/or modify
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## it under the terms of the GNU General Public License as published by
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## the Free Software Foundation, either version 3 of the License, or
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## (at your option) any later version.
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##
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## M2-Planet is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU General Public License for more details.
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##
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## You should have received a copy of the GNU General Public License
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## along with M2-Planet. If not, see <http://www.gnu.org/licenses/>.
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:_start
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COPY_rsp_to_rbp ; Protect rsp
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;; Prepare argv
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LOAD_BASE_ADDRESS_rax %8 ; ARGV_address = RBP + 8
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PUSH_RAX ; Put argv on the stack
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;; Prepare envp
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COPY_rbp_to_rax ; Address we need to load from
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LOAD_INTEGER ; Get ARGC
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ADD_IMMEDIATE_to_rax %2 ; OFFSET = ARGC + 2
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SAL_rax_Immediate8 !3 ; OFFSET = OFFSET * WORDSIZE
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ADD_rbp_to_rax ; ENVP_address = RSP + OFFSET
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PUSH_RAX ; Put envp on the stack
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;; Stack offset
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ADD_IMMEDIATE_to_rbp %8 ; Fix rbp
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;; Perform the main loop
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CALL_IMMEDIATE %FUNCTION_main
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;; Exit to kernel
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COPY_rax_to_rdi ; Using the return code given by main
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LOAD_IMMEDIATE_rax %0x3C ; Syscall exit
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SYSCALL ; Exit with that code
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