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155b378a39
The organization of the source files is now much more rational. Old experiments that didn't work out are now deleted. Naming of things like files is now more intuitive.
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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