1 /* $OpenBSD: tcb.h,v 1.4 2017/04/20 16:07:52 visa Exp $ */ 2 3 /* 4 * Copyright (c) 2011 Philip Guenther <guenther@openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #ifndef _MACHINE_TCB_H_ 20 #define _MACHINE_TCB_H_ 21 22 #ifdef _KERNEL 23 24 static inline void 25 __mips64_set_tcb(struct proc *p, void *tcb) 26 { 27 #ifdef CPU_MIPS64R2 28 extern int cpu_has_userlocal; 29 30 if (cpu_has_userlocal) 31 cp0_set_userlocal(tcb); 32 #endif 33 34 p->p_md.md_tcb = tcb; 35 } 36 37 #define TCB_SET(p, addr) __mips64_set_tcb(p, addr) 38 #define TCB_GET(p) ((p)->p_md.md_tcb) 39 40 #else /* _KERNEL */ 41 42 /* ELF TLS ABI calls for small TCB, with static TLS data after it */ 43 #define TLS_VARIANT 1 44 45 static inline void * 46 __mips64_get_tcb(void) 47 { 48 void *tcb; 49 50 /* 51 * This invokes emulation in kernel if the system does not implement 52 * the RDHWR instruction or the UserLocal register. 53 */ 54 __asm__ volatile ( 55 " .set push\n" 56 " .set mips64r2\n" 57 " rdhwr %0, $29\n" 58 " .set pop\n" : "=r" (tcb)); 59 return tcb; 60 } 61 62 #define TCB_GET() __mips64_get_tcb() 63 64 #endif /* _KERNEL */ 65 66 #endif /* _MACHINE_TCB_H_ */ 67