mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-11-22 11:14:18 +01:00
1a62e9bc00
The header exports the following: - Definition of struct tcb. - Helpers to get/set the tcb for the current thread. - TLS_TCB_SIZE (size of TCB) - TLS_TCB_ALIGN (alignment of TCB) - TLS_VARIANT_I or TLS_VARIANT_II - TLS_DTV_OFFSET (bias of pointers in dtv[]) - TLS_TP_OFFSET (bias of "thread pointer" relative to TCB) Note that TLS_TP_OFFSET does not account for if the unbiased thread pointer points to the start of the TCB (arm and x86) or the end of the TCB (MIPS, PowerPC, and RISC-V). Note also that for amd64, the struct tcb does not include the unused tcb_spare field included in the current structure in libthr. libthr does not use this field, and the existing calls in libc and rtld that allocate a TCB for amd64 assume it is the size of 3 Elf_Addr's (and thus do not allocate room for tcb_spare). A <sys/_tls_variant_i.h> header is used by architectures using Variant I TLS which uses a common struct tcb. Reviewed by: kib (older version of x86/tls.h), jrtc27 Sponsored by: The University of Cambridge, Google Inc. Differential Revision: https://reviews.freebsd.org/D33351
67 lines
2.2 KiB
C
67 lines
2.2 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
*
|
|
* Copyright 2004 by Peter Grehan. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef _MACHINE_TLS_H_
|
|
#define _MACHINE_TLS_H_
|
|
|
|
#include <sys/_tls_variant_i.h>
|
|
|
|
#define TLS_DTV_OFFSET 0x8000
|
|
#define TLS_TCB_ALIGN TLS_TCB_SIZE
|
|
#define TLS_TP_OFFSET 0x7000
|
|
|
|
static __inline void
|
|
_tcb_set(struct tcb *tcb)
|
|
{
|
|
#ifdef __powerpc64__
|
|
__asm __volatile("mr 13,%0" ::
|
|
"r" ((uint8_t *)tcb + TLS_TP_OFFSET + TLS_TCB_SIZE));
|
|
#else
|
|
__asm __volatile("mr 2,%0" ::
|
|
"r" ((uint8_t *)tcb + TLS_TP_OFFSET + TLS_TCB_SIZE));
|
|
#endif
|
|
}
|
|
|
|
static __inline struct tcb *
|
|
_tcb_get(void)
|
|
{
|
|
struct tcb *tcb;
|
|
|
|
#ifdef __powerpc64__
|
|
__asm __volatile("addi %0,13,%1" : "=r" (tcb) :
|
|
"i" (-(TLS_TP_OFFSET + TLS_TCB_SIZE)));
|
|
#else
|
|
__asm __volatile("addi %0,2,%1" : "=r" (tcb) :
|
|
"i" (-(TLS_TP_OFFSET + TLS_TCB_SIZE)));
|
|
#endif
|
|
return (tcb);
|
|
}
|
|
|
|
#endif /* !_MACHINE_TLS_H_ */
|