bba80928a8
the TLS pointer, therefore wrecking the pthread environement. Some ports had _UC_TLSBASE flag or equivalent (_UC_UNIQUE on alpha) that controlled whether setcontext() would change the TLS pointer. This change let libpthread override setcontext() with its own version that unsets _UC_TLSBASE, enabling safe usage of setcontext() with -lpthread. We also have the following required changes here: - rename alpha's _UC_UNIQUE into _UC_TLSBASE - add _UC_TLSBASE definition in header file for all ports (powerpc, sh3, sparc and sparc64 lack the implementation for now) - introduce a libc stub that can be overriden for setcontext() - modify MD libcs swapcontext() implementations so that they use the setcontext() libc stub instead of doing a plain system call. While we are there: - document various MD _UC_* flags in header file - add libc and libpthread tests for swapcontext() behavior (hopefully helpful to spot MD problems introduced with this change) Future work: - Deciding whether kernel support or _UC_TLSBASE should be added for powerpc, sh3, sparc and sparc64 is left to portmasters sparc64 Approved by core@
117 lines
3.3 KiB
C
117 lines
3.3 KiB
C
/* $NetBSD: mcontext.h,v 1.8 2012/09/12 02:00:54 manu Exp $ */
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/*-
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* Copyright (c) 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Klaus Klein.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _ALPHA_MCONTEXT_H_
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#define _ALPHA_MCONTEXT_H_
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/*
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* General register state (important: 0-31 maps to `struct reg')
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*/
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#define _NGREG 34 /* 0-31, PC, PS */
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typedef unsigned long __greg_t;
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typedef __greg_t __gregset_t[_NGREG];
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/* Convenience synonyms */
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#define _REG_V0 0
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#define _REG_T0 1
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#define _REG_T1 2
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#define _REG_T2 3
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#define _REG_T3 4
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#define _REG_T4 5
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#define _REG_T5 6
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#define _REG_T6 7
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#define _REG_T7 8
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#define _REG_S0 9
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#define _REG_S1 10
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#define _REG_S2 11
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#define _REG_S3 12
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#define _REG_S4 13
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#define _REG_S5 14
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#define _REG_S6 15
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#define _REG_A0 16
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#define _REG_A1 17
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#define _REG_A2 18
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#define _REG_A3 19
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#define _REG_A4 20
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#define _REG_A5 21
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#define _REG_T8 22
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#define _REG_T9 23
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#define _REG_T10 24
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#define _REG_T11 25
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#define _REG_RA 26
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#define _REG_T12 27
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#define _REG_PV 27
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#define _REG_AT 28
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#define _REG_GP 29
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#define _REG_SP 30
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#define _REG_UNIQUE 31
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#define _REG_PC 32
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#define _REG_PS 33
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/*
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* Floating point register state (important: maps to `struct fpreg')
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*/
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typedef struct {
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union {
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unsigned long __fp_regs[32];
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double __fp_dregs[32];
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} __fp_fr;
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unsigned long __fp_fpcr;
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} __fpregset_t;
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typedef struct {
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__gregset_t __gregs;
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__fpregset_t __fpregs;
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} mcontext_t;
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/* Machine-dependent uc_flags */
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#define _UC_TLSBASE 0x20 /* valid process-unique value in _REG_UNIQUE */
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#define _UC_MACHINE_SP(uc) ((uc)->uc_mcontext.__gregs[_REG_SP])
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#define _UC_MACHINE_PC(uc) ((uc)->uc_mcontext.__gregs[_REG_PC])
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#define _UC_MACHINE_INTRV(uc) ((uc)->uc_mcontext.__gregs[_REG_V0])
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#define _UC_MACHINE_SET_PC(uc, pc) _UC_MACHINE_PC(uc) = (pc)
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static __inline void *
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__lwp_getprivate_fast(void)
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{
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register void *__tmp __asm("$0");
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__asm volatile("call_pal %1 # PAL_rdunique"
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: "=r" (__tmp)
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: "i" (0x009e /* PAL_rdunique */));
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return __tmp;
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}
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#endif /* !_ALPHA_MCONTEXT_H_ */
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