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https://github.com/jart/cosmopolitan.git
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6f7d0cb1c3
This makes breaking changes to add underscores to many non-standard function names provided by the c library. MODE=tiny is now tinier and we now use smaller locks that are better for tiny apps in this mode. Some headers have been renamed to be in the same folder as the build package, so it'll be easier to know which build dependency is needed. Certain old misguided interfaces have been removed. Intel intrinsics headers are now listed in libc/isystem (but not in the amalgamation) to help further improve open source compatibility. Header complexity has also been reduced. Lastly, more shell scripts are now available.
56 lines
2.6 KiB
ArmAsm
56 lines
2.6 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 2022 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/macros.internal.h"
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.privileged
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// Invokes clone() system call on GNU/Systemd.
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//
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// @param rdi is flags
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// @param rsi is top of stack
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// @param rdx is ptid
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// @param rcx is ctid
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// @param r8 is tls
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// @param r9 is func(void*,int)→int
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// @param 8(rsp) is arg
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// @return tid of child on success, or -1 w/ errno
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sys_clone_linux:
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push %rbp
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mov %rsp,%rbp
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push %rbx
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mov %rcx,%r10
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mov 16(%rbp),%rbx
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mov $56,%eax # __NR_clone
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syscall
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test %rax,%rax
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jz 2f
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cmp $-4095,%rax
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jae 1f
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0: pop %rbx
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pop %rbp
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ret
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1: call systemfive_error
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jmp 0b
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2: xor %ebp,%ebp # child thread
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mov %rbx,%rdi # arg
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mov (%r10),%esi # tid
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call *%r9 # func(arg,tid)
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xchg %eax,%edi # func(arg,tid) → exitcode
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mov $60,%eax # __NR_exit(exitcode)
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syscall
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.endfn sys_clone_linux,globl,hidden
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