mirror of
https://github.com/jart/cosmopolitan.git
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67 lines
2.9 KiB
ArmAsm
67 lines
2.9 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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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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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 cosmo
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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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_xnu: movb $XNU,__hostos(%rip)
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jmp 0b
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.endfn _xnu,weak,hidden
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