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_esp_to_ebp ; Protect esp
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;; Prepare argv
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LOAD_BASE_ADDRESS_eax %4 ; ARGV_address = EBP + 4
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PUSH_eax ; Put argv on the stack
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;; Prepare envp
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COPY_ebp_to_eax ; Address we need to load from
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LOAD_INTEGER ; Get ARGC
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ADD_IMMEDIATE_to_eax %2 ; OFFSET = ARGC + 2
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SAL_eax_Immediate8 !2 ; OFFSET = OFFSET * WORDSIZE
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ADD_ebp_to_eax ; ENVP_address = ESP + OFFSET
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PUSH_eax ; Put envp on the stack
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;; Stack offset
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ADD_IMMEDIATE_to_ebp %4 ; Fix ebp
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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_eax_to_ebx ; Using the return code given by main
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LOAD_IMMEDIATE_eax %1 ; Syscall exit
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INT_80 ; Exit with that code
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