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https://codeberg.org/ziglang/zig.git
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Alex Rønne Petersen
66d97267c7
This excludes all headers in /usr/include/dev because that directory is bonkers huge (18M). We can add these on an as-needed basis.
51 lines
1.6 KiB
C
Vendored
51 lines
1.6 KiB
C
Vendored
/* $OpenBSD: tcb.h,v 1.4 2016/09/04 08:49:35 guenther Exp $ */
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/*
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* Copyright (c) 2011 Philip Guenther <guenther@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* 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 WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef _MACHINE_TCB_H_
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#define _MACHINE_TCB_H_
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#ifdef _KERNEL
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#include <machine/sysarch.h>
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#include <machine/pcb.h>
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#define TCB_GET(p) \
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((void *)i386_get_threadbase(p, TSEG_GS))
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#define TCB_SET(p, addr) \
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i386_set_threadbase(p, (uint32_t)(addr), TSEG_GS)
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#else /* _KERNEL */
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/* ELF TLS ABI calls for big TCB, with static TLS data at negative offsets */
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#define TLS_VARIANT 2
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/* Read a slot from the TCB */
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static inline void *
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__i386_read_tcb(int offset)
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{
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void *val;
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__asm__ ("movl %%gs:(%1),%0" : "=r" (val) : "r" (offset));
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return val;
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}
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/* Get a pointer to the TCB itself */
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#define TCB_GET() __i386_read_tcb(0)
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/* Setting the TCB pointer can only be done via syscall, so no TCB_SET() */
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#endif /* _KERNEL */
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#endif /* _MACHINE_TCB_H_ */ |