mirror of
https://github.com/jart/cosmopolitan.git
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edd9297eba
Your Actually Portable Executables now contains a simple virtual memory that works similarly to the Linux Kernel in the sense that it maps your physical memory to negative addresses. This is needed to support mmap() and malloc(). This functionality has zero code size impact. For example the MODE=tiny LIFE.COM executable is still only 12KB in size. The APE bootloader code has also been simplified to improve readibility and further elevate the elegance by which we're able to support so many platforms thereby enhancing verifiability so that we may engender trust in this bootloading process.
80 lines
3.2 KiB
ArmAsm
80 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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// 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 16(%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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