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/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi
Copyright 2020 Justine Alexandra Roberts Tunney
This program 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; version 2 of the License. │
This program 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 this program; if not, write to the Free Software │
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include "libc/dce.h"
#include "libc/macros.h"
#include "libc/notice.inc"
#include "libc/runtime/internal.h"
.section .start,"ax",@progbits
.source __FILE__
nop
/ System Five userspace program entrypoint.
/
/ @param rsp is [n,argv₀..argvₙ₋₁,0,envp₀..,0,auxv₀..,0,..]
/ @note FreeBSD is special (see freebsd/lib/csu/amd64/...)
/ @noreturn
_start: test %rdi,%rdi
cmovnz %rdi,%rsp
jz 0f
movb $FREEBSD,hostos(%rip)
0: mov (%rsp),%ebx # argc
lea 8(%rsp),%rsi # argv
lea 24(%rsp,%rbx,8),%rdx # envp
.frame0
/ bofram 9f
.weak idata.iat
.weak idata.iatend
ezlea missingno,ax # make win32 imps noop
ezlea idata.iat,di
ezlea idata.iatend,cx
sub %rdi,%rcx
shr $3,%ecx
rep stosq
xor %eax,%eax # find end of environ
or $-1,%ecx
mov %rdx,%rdi
repnz scasq
mov %rdi,%rcx # auxv
mov %ebx,%edi
call _executive
9: ud2
.endfn _start,weak,hidden
/ Macintosh userspace program entrypoint.
/
/ @param rsp is [n,argv₀..argvₙ₋₁,0,envp₀..,0,auxv₀..,0,..]
/ @note FreeBSD is special (see freebsd/lib/csu/amd64/...)
/ @noreturn
_start_xnu:
movb $XNU,hostos(%rip)
jmp 0b
.endfn _start_xnu,weak,hidden