e21f96a811
machine/regnum.h ends up being included by sys/procfs.h and sys/ptrace.h via machine/reg.h. Many of the regnum definitions are too short and too generic to be exposing to any userland application including one of these two headers. Moreover, these actively cause build failures in googletest (template <typename T1 ...> expanding to template <typename 9 ...>). Hide the definitions behind _KERNEL or _WANT_MIPS_REGNUM, and patch all of the userland consumers to define as needed. Discussed with: imp, jhb Reviewed by: imp, jhb MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D21330
124 lines
3.8 KiB
C
124 lines
3.8 KiB
C
/* $NetBSD: makecontext.c,v 1.5 2009/12/14 01:07:42 matt Exp $ */
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/*-
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* SPDX-License-Identifier: BSD-2-Clause-NetBSD
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: makecontext.c,v 1.5 2009/12/14 01:07:42 matt Exp $");
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#endif
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#include <sys/param.h>
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#include <machine/abi.h>
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#define _WANT_MIPS_REGNUM
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#include <machine/regnum.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <ucontext.h>
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__weak_reference(__makecontext, makecontext);
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void _ctx_done(ucontext_t *);
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void _ctx_start(void);
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void
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__makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
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{
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mcontext_t *mc;
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register_t *sp;
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int i;
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va_list ap;
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/*
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* XXX/juli
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* We need an mc_len or mc_flags like other architectures
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* so that we can mark a context as invalid. Store it in
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* mc->mc_regs[ZERO] perhaps?
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*/
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if (argc < 0 || ucp == NULL ||
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ucp->uc_stack.ss_sp == NULL ||
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ucp->uc_stack.ss_size < MINSIGSTKSZ)
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return;
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mc = &ucp->uc_mcontext;
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sp = (register_t *)
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((uintptr_t)ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size);
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#if defined(__mips_o32) || defined(__mips_o64)
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sp -= (argc >= 4 ? argc : 4); /* Make room for >=4 arguments. */
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#elif defined(__mips_n32) || defined(__mips_n64)
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sp -= (argc > 8 ? argc - 8 : 0); /* Make room for > 8 arguments. */
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#endif
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sp = (register_t *)((uintptr_t)sp & ~(STACK_ALIGN - 1));
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mc->mc_regs[SP] = (intptr_t)sp;
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mc->mc_regs[S0] = (intptr_t)ucp;
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mc->mc_regs[T9] = (intptr_t)func;
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mc->mc_pc = (intptr_t)_ctx_start;
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/* Construct argument list. */
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va_start(ap, argc);
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#if defined(__mips_o32) || defined(__mips_o64)
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/* Up to the first four arguments are passed in $a0-3. */
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for (i = 0; i < argc && i < 4; i++)
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/* LINTED register_t is safe */
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mc->mc_regs[A0 + i] = va_arg(ap, register_t);
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/* Skip over the $a0-3 gap. */
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sp += 4;
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#endif
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#if defined(__mips_n32) || defined(__mips_n64)
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/* Up to the first 8 arguments are passed in $a0-7. */
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for (i = 0; i < argc && i < 8; i++)
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/* LINTED register_t is safe */
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mc->mc_regs[A0 + i] = va_arg(ap, register_t);
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#endif
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/* Pass remaining arguments on the stack. */
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for (; i < argc; i++)
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/* LINTED register_t is safe */
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*sp++ = va_arg(ap, register_t);
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va_end(ap);
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}
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void
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_ctx_done(ucontext_t *ucp)
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{
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if (ucp->uc_link == NULL)
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exit(0);
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else {
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setcontext((const ucontext_t *)ucp->uc_link);
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abort();
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}
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}
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