mirror of
https://github.com/jart/cosmopolitan.git
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a6baba1b07
The WIN32 CreateProcess() function does not require an .exe or .com suffix in order to spawn an executable. Now that we have Cosmo bash we're no longer so dependent on the cmd.exe prompt.
164 lines
4.9 KiB
ArmAsm
164 lines
4.9 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│ vi: set noet ft=asm ts=8 sw=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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.section .start,"ax",@progbits
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#if SupportsXnu() && defined(__x86_64__)
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// XNU AMD64 Entrypoint
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//
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// @note Rosetta barely implements MAC_LC_UNIXTHREAD
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// @note Rosetta sets many registers to weird values
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_apple: mov $_HOSTXNU,%cl
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jmp 1f
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.endfn _apple,weak,hidden
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#endif
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#if SupportsWindows() && defined(__x86_64__) && !IsTiny()
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// implements all win32 apis on non-windows hosts
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// it is just enough code to get a good backtrace
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__oops_win32:
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ud2
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nop
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.endfn __oops_win32
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#endif
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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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#ifdef __x86_64__
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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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1: mov %cl,__hostos(%rip)
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mov %rdx,__program_executable_name(%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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mov %rdx,__envp(%rip)
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// setup stack
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xor %ebp,%ebp
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and $ape_stack_round,%rsp
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#if SupportsWindows() && !IsTiny()
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// make win32 imps crash
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.weak ape_idata_iat
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.weak ape_idata_iatend
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ezlea __oops_win32,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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#endif
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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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// strongly link main() function (discarded by linker)
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.section .yoink
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call main
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.previous
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////////////////////////////////////////////////////////////////////////////////
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#elif defined(__aarch64__)
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#if SupportsFreebsd()
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// save first arg
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mov x4,x0
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#endif
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// save original stack pointer
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// this is the first argument to cosmo() below
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mov x0,sp
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// setup the stack
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mov x28,#0
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mov x29,#0
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mov x30,#0
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ldr x1,=ape_stack_round
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and x1,x0,x1
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mov sp,x1
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// second arg shall be struct Syslib passed by ape-m1.c
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// used to talk to apple's authoritarian libraries
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// should be set to zero on other platforms
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mov x1,x15
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// third arg is program path passed by loader
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// fourth arg is detected os passed by loader
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// switch to c code
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bl cosmo
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.unreachable
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// strongly link main() function (discarded by linker)
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.section .yoink
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bl main
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.previous
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////////////////////////////////////////////////////////////////////////////////
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#else
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#error "architecture unsupported"
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#endif /* __x86_64__ */
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.endfn _start,weak,hidden
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