10Sstevel@tonic-gate/* 20Sstevel@tonic-gate * CDDL HEADER START 30Sstevel@tonic-gate * 40Sstevel@tonic-gate * The contents of this file are subject to the terms of the 56515Sraf * Common Development and Distribution License (the "License"). 66515Sraf * You may not use this file except in compliance with the License. 70Sstevel@tonic-gate * 80Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 90Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 100Sstevel@tonic-gate * See the License for the specific language governing permissions 110Sstevel@tonic-gate * and limitations under the License. 120Sstevel@tonic-gate * 130Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 140Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 150Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 160Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 170Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 180Sstevel@tonic-gate * 190Sstevel@tonic-gate * CDDL HEADER END 200Sstevel@tonic-gate */ 216515Sraf 220Sstevel@tonic-gate/* 236515Sraf * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 240Sstevel@tonic-gate * Use is subject to license terms. 250Sstevel@tonic-gate */ 260Sstevel@tonic-gate 27*7298SMark.J.Nelson@Sun.COM .file "getcontext.s" 280Sstevel@tonic-gate 290Sstevel@tonic-gate#include <sys/asm_linkage.h> 300Sstevel@tonic-gate 310Sstevel@tonic-gate ANSI_PRAGMA_WEAK(getcontext,function) 320Sstevel@tonic-gate ANSI_PRAGMA_WEAK(swapcontext,function) 330Sstevel@tonic-gate 340Sstevel@tonic-gate#include "SYS.h" 350Sstevel@tonic-gate#include <../assym.h> 360Sstevel@tonic-gate 370Sstevel@tonic-gate/* 380Sstevel@tonic-gate * getcontext() is written in assembler since it has to capture the correct 390Sstevel@tonic-gate * machine state of the calle. 400Sstevel@tonic-gate * 410Sstevel@tonic-gate * As swapcontext() is actually equivalent to getcontext() + setcontext(), 420Sstevel@tonic-gate * swapcontext() shares the most code with getcontext(). 430Sstevel@tonic-gate */ 440Sstevel@tonic-gate 450Sstevel@tonic-gate#define GETCONTEXT_IMPL(offset) \ 460Sstevel@tonic-gate pushq %rdi; /* preserve the ucontext_t pointer */ \ 476515Sraf call __getcontext; \ 480Sstevel@tonic-gate /* call getcontext: syscall */ \ 490Sstevel@tonic-gate popq %rdx; \ 500Sstevel@tonic-gate andl %eax, %eax; /* if (error_return_from_syscall) */ \ 510Sstevel@tonic-gate je 1f; \ 520Sstevel@tonic-gate addq $offset, %rsp; \ 530Sstevel@tonic-gate ret; /* then just return */ \ 540Sstevel@tonic-gate1: \ 550Sstevel@tonic-gate /* \ 560Sstevel@tonic-gate * fix up %rsp and %rip \ 570Sstevel@tonic-gate */ \ 580Sstevel@tonic-gate addq $UC_MCONTEXT_GREGS, %rdx; \ 590Sstevel@tonic-gate /* &ucp->uc_mcontext.gregs */ \ 600Sstevel@tonic-gate movq offset+0(%rsp), %rax; \ 610Sstevel@tonic-gate /* read return PC from stack */ \ 620Sstevel@tonic-gate movq %rax, RIP_OFF (%rdx); \ 630Sstevel@tonic-gate /* store ret PC in EIP of env var */ \ 640Sstevel@tonic-gate leaq offset+8(%rsp), %rax; \ 650Sstevel@tonic-gate /* get caller's sp at time of call */ \ 660Sstevel@tonic-gate movq %rax, RSP_OFF (%rdx); \ 670Sstevel@tonic-gate /* store the sp into UESP of env var */ \ 680Sstevel@tonic-gate xorq %rax, %rax; /* return 0 */ \ 690Sstevel@tonic-gate movq %rax, RAX_OFF (%rdx); \ 700Sstevel@tonic-gate /* getcontext returns 0 after setcontext */ 710Sstevel@tonic-gate 720Sstevel@tonic-gate/* 730Sstevel@tonic-gate * getcontext(ucontext_t *ucp) 740Sstevel@tonic-gate */ 750Sstevel@tonic-gate 760Sstevel@tonic-gate ENTRY(getcontext) 770Sstevel@tonic-gate GETCONTEXT_IMPL(0) 780Sstevel@tonic-gate ret 790Sstevel@tonic-gate SET_SIZE(getcontext) 800Sstevel@tonic-gate 810Sstevel@tonic-gate/* 820Sstevel@tonic-gate * swapcontext(ucontext_t *oucp, const ucontext_t *ucp) 830Sstevel@tonic-gate */ 840Sstevel@tonic-gate 850Sstevel@tonic-gate ENTRY(swapcontext) 860Sstevel@tonic-gate pushq %rsi /* preserve the 2nd argument */ 870Sstevel@tonic-gate 880Sstevel@tonic-gate GETCONTEXT_IMPL(8) 890Sstevel@tonic-gate 900Sstevel@tonic-gate /* call setcontext */ 910Sstevel@tonic-gate popq %rdi 926515Sraf call setcontext 930Sstevel@tonic-gate ret 940Sstevel@tonic-gate SET_SIZE(swapcontext) 95