88eb90dd38
* lib/linux/x86_64-mes-gcc/crt1.c (_start): Replace manual initialization of __stdin, __stdout, __stderr, and environ with __init_io (). * lib/linux/x86_64-mes-m2/crt1.M1 (_start): Likewise. * lib/linux/x86_64-mes-mescc/crt1.c (_start): Likewise.
58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
/* -*-comment-start: "//";comment-end:""-*-
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* GNU Mes --- Maxwell Equations of Software
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* Copyright © 2017,2018,2023 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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*
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* This file is part of GNU Mes.
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*
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* GNU Mes is free software; you can redistribute it and/or modify it
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* 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 (at
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* your option) any later version.
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*
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* GNU Mes is distributed in the hope that it will be useful, but
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* 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 GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <mes/lib-mini.h>
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int main (int argc, char *argv[], char *envp[]);
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// gcc x86_64 calling convention:
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// rdi, rsi, rdx, rcx, r8, r9, <stack0>, <stack1>
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// *INDENT-OFF*
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void
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_start ()
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{
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asm (
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"mov %rbp,%rax\n\t"
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"add $8,%rax\n\t"
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"mov (%rax),%rax\n\t"
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"add $3,%rax\n\t"
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"shl $3,%rax\n\t"
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"add %rbp,%rax\n\t"
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"mov %rax,%rdx\n\t"
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"mov %rbp,%rax\n\t"
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"add $16,%rax\n\t"
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"mov %rax,%rsi\n\t"
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"mov %rbp,%rax\n\t"
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"add $8,%rax\n\t"
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"mov (%rax),%rax\n\t"
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"mov %rax,%rdi\n\t"
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"call __init_io\n\t"
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"call main\n\t"
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"mov %rax,%rdi\n\t"
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"mov $0x3c,%rax\n\t"
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"syscall \n\t"
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"hlt \n\t"
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);
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}
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