mirror of
https://github.com/jart/cosmopolitan.git
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105 lines
3.6 KiB
ArmAsm
105 lines
3.6 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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// @note NetBSD will only zero the call-clobbered registers
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// @note ape.S and ape-loader both set RCX to XNU on Darwin
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// @noreturn
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_start:
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#if SupportsXnu()
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// Hack for detecting M1 Rosetta environment.
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// https://github.com/jart/cosmopolitan/issues/429#issuecomment-1166704377
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cmp $-1,%ebx
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jne 0f
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cmp $+1,%edx
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jne 0f
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mov $_HOSTXNU,%cl
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xor %edi,%edi
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0:
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#endif
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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 $_HOSTFREEBSD,%cl
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0:
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#endif
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// set operating system when already detected
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mov %cl,__hostos(%rip)
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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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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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