mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-12 01:08:00 +00:00
b76b2be2d0
readdir() will now always yield an inode that's consistent with stat() on ZipOS and Windows in general. More APIs have been updated to return the appropriate error code when inappropriately trying to do ops, like sockets, with a zip file descriptor. The path normalization algorithms are now fully fleshed out. Some socket APIs have been fixed so they'll raise EBADF vs. ENOTSOCK appropriately. Lastly seekdir() will now work properly on NetBSD and FreeBSD (not sure why anyone would even use it)
146 lines
4.7 KiB
ArmAsm
146 lines
4.7 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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#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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// 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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// 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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// setup backtraces
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xor %ebp,%ebp
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// make process stack (8mb) follow thread stack (256kb) alignment
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and $-(256*1024),%rsp
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#if SupportsWindows()
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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 __win32_oops,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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// libc_runtime had to weakly link, due to package.com
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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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// 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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// make process stack (8mb) conform to thread stack (256kb) alignment
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mov x1,sp
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and sp,x1,-(256*1024)
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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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// 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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// libc_runtime had to weakly link, due to package.com
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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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