1*7c478bd9Sstevel@tonic-gate /* 2*7c478bd9Sstevel@tonic-gate * CDDL HEADER START 3*7c478bd9Sstevel@tonic-gate * 4*7c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*7c478bd9Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*7c478bd9Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*7c478bd9Sstevel@tonic-gate * with the License. 8*7c478bd9Sstevel@tonic-gate * 9*7c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*7c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*7c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 12*7c478bd9Sstevel@tonic-gate * and limitations under the License. 13*7c478bd9Sstevel@tonic-gate * 14*7c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*7c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*7c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*7c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*7c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*7c478bd9Sstevel@tonic-gate * 20*7c478bd9Sstevel@tonic-gate * CDDL HEADER END 21*7c478bd9Sstevel@tonic-gate */ 22*7c478bd9Sstevel@tonic-gate /* 23*7c478bd9Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24*7c478bd9Sstevel@tonic-gate * Use is subject to license terms. 25*7c478bd9Sstevel@tonic-gate */ 26*7c478bd9Sstevel@tonic-gate 27*7c478bd9Sstevel@tonic-gate /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 28*7c478bd9Sstevel@tonic-gate /* All Rights Reserved */ 29*7c478bd9Sstevel@tonic-gate 30*7c478bd9Sstevel@tonic-gate /* 31*7c478bd9Sstevel@tonic-gate * UNIX shell 32*7c478bd9Sstevel@tonic-gate */ 33*7c478bd9Sstevel@tonic-gate 34*7c478bd9Sstevel@tonic-gate /* To use stack as temporary workspace across 35*7c478bd9Sstevel@tonic-gate * possible storage allocation (eg name lookup) 36*7c478bd9Sstevel@tonic-gate * a) get ptr from `relstak' 37*7c478bd9Sstevel@tonic-gate * b) can now use `pushstak' 38*7c478bd9Sstevel@tonic-gate * c) then reset with `setstak' 39*7c478bd9Sstevel@tonic-gate * d) `absstak' gives real address if needed 40*7c478bd9Sstevel@tonic-gate */ 41*7c478bd9Sstevel@tonic-gate #define relstak() (staktop-stakbot) 42*7c478bd9Sstevel@tonic-gate #define absstak(x) (stakbot+Rcheat(x)) 43*7c478bd9Sstevel@tonic-gate #define setstak(x) (staktop=absstak(x)) 44*7c478bd9Sstevel@tonic-gate #define pushstak(c) (*staktop++=(c)) 45*7c478bd9Sstevel@tonic-gate #define zerostak() (*staktop=0) 46*7c478bd9Sstevel@tonic-gate 47*7c478bd9Sstevel@tonic-gate /* Used to address an item left on the top of 48*7c478bd9Sstevel@tonic-gate * the stack (very temporary) 49*7c478bd9Sstevel@tonic-gate */ 50*7c478bd9Sstevel@tonic-gate #define curstak() (staktop) 51*7c478bd9Sstevel@tonic-gate 52*7c478bd9Sstevel@tonic-gate /* `usestak' before `pushstak' then `fixstak' 53*7c478bd9Sstevel@tonic-gate * These routines are safe against heap 54*7c478bd9Sstevel@tonic-gate * being allocated. 55*7c478bd9Sstevel@tonic-gate */ 56*7c478bd9Sstevel@tonic-gate #define usestak() {locstak();} 57*7c478bd9Sstevel@tonic-gate 58*7c478bd9Sstevel@tonic-gate /* for local use only since it hands 59*7c478bd9Sstevel@tonic-gate * out a real address for the stack top 60*7c478bd9Sstevel@tonic-gate */ 61*7c478bd9Sstevel@tonic-gate extern unsigned char *locstak(); 62*7c478bd9Sstevel@tonic-gate 63*7c478bd9Sstevel@tonic-gate /* Will allocate the item being used and return its 64*7c478bd9Sstevel@tonic-gate * address (safe now). 65*7c478bd9Sstevel@tonic-gate */ 66*7c478bd9Sstevel@tonic-gate #define fixstak() endstak(staktop) 67*7c478bd9Sstevel@tonic-gate 68*7c478bd9Sstevel@tonic-gate /* For use after `locstak' to hand back 69*7c478bd9Sstevel@tonic-gate * new stack top and then allocate item 70*7c478bd9Sstevel@tonic-gate */ 71*7c478bd9Sstevel@tonic-gate extern unsigned char *endstak(); 72*7c478bd9Sstevel@tonic-gate 73*7c478bd9Sstevel@tonic-gate /* Copy a string onto the stack and 74*7c478bd9Sstevel@tonic-gate * allocate the space. 75*7c478bd9Sstevel@tonic-gate */ 76*7c478bd9Sstevel@tonic-gate extern unsigned char *cpystak(); 77*7c478bd9Sstevel@tonic-gate 78*7c478bd9Sstevel@tonic-gate /* Copy a string onto the stack, checking for stack overflow 79*7c478bd9Sstevel@tonic-gate * as the copy is done. Same calling sequence as "movstr". 80*7c478bd9Sstevel@tonic-gate */ 81*7c478bd9Sstevel@tonic-gate extern unsigned char *movstrstak(); 82*7c478bd9Sstevel@tonic-gate 83*7c478bd9Sstevel@tonic-gate /* Move bytes onto the stack, checking for stack overflow 84*7c478bd9Sstevel@tonic-gate * as the copy is done. Same calling sequence as the C 85*7c478bd9Sstevel@tonic-gate * library routine "memcpy". 86*7c478bd9Sstevel@tonic-gate */ 87*7c478bd9Sstevel@tonic-gate extern unsigned char *memcpystak(); 88*7c478bd9Sstevel@tonic-gate 89*7c478bd9Sstevel@tonic-gate /* Allocate given ammount of stack space */ 90*7c478bd9Sstevel@tonic-gate extern unsigned char *getstak(); 91*7c478bd9Sstevel@tonic-gate 92*7c478bd9Sstevel@tonic-gate /* Grow the data segment to include a given location */ 93*7c478bd9Sstevel@tonic-gate extern void growstak(); 94*7c478bd9Sstevel@tonic-gate 95*7c478bd9Sstevel@tonic-gate /* A chain of ptrs of stack blocks that 96*7c478bd9Sstevel@tonic-gate * have become covered by heap allocation. 97*7c478bd9Sstevel@tonic-gate * `tdystak' will return them to the heap. 98*7c478bd9Sstevel@tonic-gate */ 99*7c478bd9Sstevel@tonic-gate extern struct blk *stakbsy; 100*7c478bd9Sstevel@tonic-gate 101*7c478bd9Sstevel@tonic-gate /* Base of the entire stack */ 102*7c478bd9Sstevel@tonic-gate extern unsigned char *stakbas; 103*7c478bd9Sstevel@tonic-gate 104*7c478bd9Sstevel@tonic-gate /* Top of entire stack */ 105*7c478bd9Sstevel@tonic-gate extern unsigned char *brkend; 106*7c478bd9Sstevel@tonic-gate 107*7c478bd9Sstevel@tonic-gate /* Base of current item */ 108*7c478bd9Sstevel@tonic-gate extern unsigned char *stakbot; 109*7c478bd9Sstevel@tonic-gate 110*7c478bd9Sstevel@tonic-gate /* Top of current item */ 111*7c478bd9Sstevel@tonic-gate extern unsigned char *staktop; 112*7c478bd9Sstevel@tonic-gate 113*7c478bd9Sstevel@tonic-gate /* Used with tdystak */ 114*7c478bd9Sstevel@tonic-gate extern unsigned char *savstak(); 115