17c478bd9Sstevel@tonic-gate /* 27c478bd9Sstevel@tonic-gate * CDDL HEADER START 37c478bd9Sstevel@tonic-gate * 47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 57c478bd9Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 67c478bd9Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 77c478bd9Sstevel@tonic-gate * with the License. 87c478bd9Sstevel@tonic-gate * 97c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 107c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 117c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 127c478bd9Sstevel@tonic-gate * and limitations under the License. 137c478bd9Sstevel@tonic-gate * 147c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 157c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 167c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 177c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 187c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 197c478bd9Sstevel@tonic-gate * 207c478bd9Sstevel@tonic-gate * CDDL HEADER END 217c478bd9Sstevel@tonic-gate */ 227c478bd9Sstevel@tonic-gate /* 237c478bd9Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 247c478bd9Sstevel@tonic-gate * Use is subject to license terms. 257c478bd9Sstevel@tonic-gate */ 267c478bd9Sstevel@tonic-gate 27*61679b0bSGordon Ross #pragma ident "%Z%%M% %I% %E% SMI" 28*61679b0bSGordon Ross 297c478bd9Sstevel@tonic-gate /* 307c478bd9Sstevel@tonic-gate * Context-saving routine used for pipelines. Designed for use only 317c478bd9Sstevel@tonic-gate * with kmdb_setcontext, and with the assumption that func() will never 327c478bd9Sstevel@tonic-gate * return. 337c478bd9Sstevel@tonic-gate */ 347c478bd9Sstevel@tonic-gate 357c478bd9Sstevel@tonic-gate #include <strings.h> 367c478bd9Sstevel@tonic-gate #include <ucontext.h> 377c478bd9Sstevel@tonic-gate #include <sys/types.h> 387c478bd9Sstevel@tonic-gate #include <sys/stack.h> 397c478bd9Sstevel@tonic-gate 407c478bd9Sstevel@tonic-gate #include <kmdb/kmdb_context_impl.h> 417c478bd9Sstevel@tonic-gate #include <mdb/mdb_kreg.h> 427c478bd9Sstevel@tonic-gate 437c478bd9Sstevel@tonic-gate void 447c478bd9Sstevel@tonic-gate kmdb_makecontext(ucontext_t *ucp, void (*func)(void *), void *arg, caddr_t stk, 457c478bd9Sstevel@tonic-gate size_t stksize) 467c478bd9Sstevel@tonic-gate { 477c478bd9Sstevel@tonic-gate /* 487c478bd9Sstevel@tonic-gate * Top-of-stack must be rounded down to STACK_ALIGN and 497c478bd9Sstevel@tonic-gate * there must be a minimum frame for the register window. 507c478bd9Sstevel@tonic-gate */ 517c478bd9Sstevel@tonic-gate uintptr_t stack = (((uintptr_t)stk + stksize - 1) & 527c478bd9Sstevel@tonic-gate ~(STACK_ALIGN - 1)) - SA(MINFRAME); 537c478bd9Sstevel@tonic-gate 547c478bd9Sstevel@tonic-gate /* clear the top stack frame */ 557c478bd9Sstevel@tonic-gate bzero((void *)stack, SA(MINFRAME)); 567c478bd9Sstevel@tonic-gate 577c478bd9Sstevel@tonic-gate /* fill in registers of interest */ 587c478bd9Sstevel@tonic-gate ucp->uc_mcontext.gregs[REG_PC] = (greg_t)func; 597c478bd9Sstevel@tonic-gate ucp->uc_mcontext.gregs[REG_nPC] = (greg_t)func + 4; 607c478bd9Sstevel@tonic-gate ucp->uc_mcontext.gregs[REG_O0] = (greg_t)arg; 617c478bd9Sstevel@tonic-gate ucp->uc_mcontext.gregs[REG_SP] = (greg_t)(stack - STACK_BIAS); 627c478bd9Sstevel@tonic-gate ucp->uc_mcontext.gregs[REG_O7] = NULL; 637c478bd9Sstevel@tonic-gate ucp->uc_mcontext.gregs[REG_G7] = NULL; 647c478bd9Sstevel@tonic-gate } 65