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