mirror of
https://github.com/jart/cosmopolitan.git
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dc0ea6640e
This change makes further effort towards improving our poll() implementation on the New Technology. The stdin worker didn't work out so well for Python so it's not being used for now. System call tracing with the --strace flag should now be less noisy now on Windows unless you modify the strace.internal.h defines to turn on some optional ones that are most useful for debugging the system call wrappers.
98 lines
3.5 KiB
ArmAsm
98 lines
3.5 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.internal.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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// detect free besiyata dishmaya
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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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// get startup timestamp as early as possible
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// its used by --strace flag and kprintf() %T
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0: rdtsc
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ezlea kStartTsc,bx
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mov %eax,(%rbx)
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mov %edx,4(%rbx)
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// translates arguments from old stack abi
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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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mov %rsp,__oldstack(%rip)
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and $-16,%rsp
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xor %ebp,%ebp
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// bofram 9f
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// make win32 imps noop
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.weak ape_idata_iat
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.weak ape_idata_iatend
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ezlea missingno,ax
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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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// scan through environment varis
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// find start of auxiliary values
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xor %eax,%eax
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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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// xnu doesn't have auxiliary values
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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 %rsp,%rcx # auxv
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#endif
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// enter cosmopolitan runtime
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1: mov %ebx,%edi
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call cosmo
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9: .unreachable
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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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