1*0Sstevel@tonic-gate/* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate/* 23*0Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24*0Sstevel@tonic-gate * Use is subject to license terms. 25*0Sstevel@tonic-gate */ 26*0Sstevel@tonic-gate 27*0Sstevel@tonic-gate#pragma ident "%Z%%M% %I% %E% SMI" 28*0Sstevel@tonic-gate 29*0Sstevel@tonic-gate .file "%M%" 30*0Sstevel@tonic-gate 31*0Sstevel@tonic-gate#include <sys/asm_linkage.h> 32*0Sstevel@tonic-gate 33*0Sstevel@tonic-gate ANSI_PRAGMA_WEAK(getcontext,function) 34*0Sstevel@tonic-gate ANSI_PRAGMA_WEAK(swapcontext,function) 35*0Sstevel@tonic-gate 36*0Sstevel@tonic-gate#include "SYS.h" 37*0Sstevel@tonic-gate#include <assym.h> 38*0Sstevel@tonic-gate 39*0Sstevel@tonic-gate/* 40*0Sstevel@tonic-gate * getcontext() and swapcontext() are written in assembler since it has to 41*0Sstevel@tonic-gate * capture the correct machine state of the caller, including 42*0Sstevel@tonic-gate * the registers: %edi, %esi and %ebx. 43*0Sstevel@tonic-gate * 44*0Sstevel@tonic-gate * As swapcontext() is actually equivalent to getcontext() + setcontext(), 45*0Sstevel@tonic-gate * swapcontext() shares the most code with getcontext(). 46*0Sstevel@tonic-gate */ 47*0Sstevel@tonic-gate 48*0Sstevel@tonic-gate 49*0Sstevel@tonic-gate#define GETCONTEXT_IMPL \ 50*0Sstevel@tonic-gate movl 4(%esp), %eax; /* %eax <-- first arg: ucp */ \ 51*0Sstevel@tonic-gate pushl %eax; /* push ucp for system call */ \ 52*0Sstevel@tonic-gate call __getcontext_syscall; /* call getcontext: syscall */ \ 53*0Sstevel@tonic-gate addl $4, %esp; /* pop arg */ \ 54*0Sstevel@tonic-gate andl %eax, %eax; /* if (err_ret_from_syscall) */ \ 55*0Sstevel@tonic-gate je 1f; \ 56*0Sstevel@tonic-gate ret; /* then return */ \ 57*0Sstevel@tonic-gate1: \ 58*0Sstevel@tonic-gate movl 4(%esp), %eax; /* recompute first arg */ \ 59*0Sstevel@tonic-gate /* \ 60*0Sstevel@tonic-gate * fix up %esp and %eip \ 61*0Sstevel@tonic-gate */ \ 62*0Sstevel@tonic-gate leal UC_MCONTEXT_GREGS (%eax), %edx; \ 63*0Sstevel@tonic-gate /* %edx <-- &ucp->uc_mcontext.gregs */ \ 64*0Sstevel@tonic-gate movl 0(%esp), %eax; /* read return PC from stack */ \ 65*0Sstevel@tonic-gate movl %eax, EIP_OFF (%edx); \ 66*0Sstevel@tonic-gate /* store ret PC in EIP of env var */ \ 67*0Sstevel@tonic-gate leal 4(%esp), %eax; /* get caller's sp at time of call */ \ 68*0Sstevel@tonic-gate movl %eax, UESP_OFF (%edx); \ 69*0Sstevel@tonic-gate /* store the sp into UESP of env var */ \ 70*0Sstevel@tonic-gate xorl %eax, %eax; /* return 0 */ \ 71*0Sstevel@tonic-gate movl %eax, EAX_OFF (%edx); \ 72*0Sstevel@tonic-gate /* getcontext returns 0 after a setcontext */ 73*0Sstevel@tonic-gate 74*0Sstevel@tonic-gate/* 75*0Sstevel@tonic-gate * getcontext(ucontext_t *ucp) 76*0Sstevel@tonic-gate */ 77*0Sstevel@tonic-gate ANSI_PRAGMA_WEAK2(_private_getcontext,getcontext,function) 78*0Sstevel@tonic-gate 79*0Sstevel@tonic-gate ENTRY(getcontext) 80*0Sstevel@tonic-gate GETCONTEXT_IMPL 81*0Sstevel@tonic-gate ret 82*0Sstevel@tonic-gate SET_SIZE(getcontext) 83*0Sstevel@tonic-gate 84*0Sstevel@tonic-gate 85*0Sstevel@tonic-gate/* 86*0Sstevel@tonic-gate * swapcontext(ucontext_t *oucp, const ucontext_t *ucp) 87*0Sstevel@tonic-gate */ 88*0Sstevel@tonic-gate ENTRY(swapcontext) 89*0Sstevel@tonic-gate GETCONTEXT_IMPL 90*0Sstevel@tonic-gate / call setcontext 91*0Sstevel@tonic-gate movl 8(%esp), %eax /* %eax <-- second arg: ucp */ 92*0Sstevel@tonic-gate pushl %eax /* push ucp for setcontext */ 93*0Sstevel@tonic-gate call _private_setcontext /* call setcontext */ 94*0Sstevel@tonic-gate addl $4, %esp /* pop arg: just in case */ 95*0Sstevel@tonic-gate ret 96*0Sstevel@tonic-gate SET_SIZE(swapcontext) 97