mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-03-03 15:38:22 +00:00
e75ffde09e
You can now build Cosmopolitan with Clang:
make -j8 MODE=llvm
o/llvm/examples/hello.com
The assembler and linker code is now friendly to LLVM too.
So it's not needed to configure Clang to use binutils under
the hood. If you love LLVM then you can now use pure LLVM.
81 lines
3.2 KiB
ArmAsm
81 lines
3.2 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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.align 16
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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:
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#if SupportsFreebsd()
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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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#endif
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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 ape_idata_iat
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.weak ape_idata_iatend
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ezlea missingno,ax # make win32 imps noop
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ezlea ape_idata_iat,di
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ezlea ape_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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#if SupportsXnu()
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testb IsXnu()
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jz 1f # polyfill xnu auxv
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push $0 # auxv[1][1]=0
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push $0 # auxv[1][0]=0
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mov (%rcx),%rax # executable_path=BIN
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lea 16(%rax),%rax # BIN
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push %rax # auxv[0][0]=BIN
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push $31 # auxv[0][0]=AT_EXECFN
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mov %rsp,%rcx # auxv
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#endif
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1: 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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#if SupportsXnu()
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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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#endif
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