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https://github.com/jart/cosmopolitan.git
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50 lines
2.5 KiB
ArmAsm
50 lines
2.5 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 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/sysv/consts/nr.h"
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#include "libc/macros.h"
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.privileged
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cosmo_futex_thunk:
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#ifdef __x86_64__
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push %rbp
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mov %rsp,%rbp
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mov %rcx,%r10
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mov __NR_futex,%eax
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clc
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syscall
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jnc 1f
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neg %eax
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1: pop %rbp
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#elif defined(__aarch64__)
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ldr x7,=__hostos
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ldr w7,[x7]
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tst x7,1 // IsLinux()
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mov x7,98 // futex (Linux)
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mov x8,454 // _umtx_op (FreeBSD)
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csel x8,x7,x8,ne // choose syscall magnum
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mov x7,0 // clear carry (for Linux)
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adds x7,x7,0 // clear carry
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svc #0 // call kernel
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bcc 1f // jump if not carry
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neg x0,x0 // linux style errno
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#else
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#error "unsupported architecture"
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#endif /* __x86_64__ */
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1: ret
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.endfn cosmo_futex_thunk,globl,hidden
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