1 /*- 2 * Copyright (c) 1998-1999 Andrew Gallatin 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software withough specific prior written permission 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #include <vm/vm.h> 32 #include <vm/vm_param.h> 33 #include <vm/pmap.h> 34 35 36 #include <sys/exec.h> 37 #include <sys/sysent.h> 38 #include <sys/cdefs.h> 39 40 struct freebsd32_ps_strings { 41 u_int32_t ps_argvstr; /* first of 0 or more argument strings */ 42 int ps_nargvstr; /* the number of argument strings */ 43 u_int32_t ps_envstr; /* first of 0 or more environment strings */ 44 int ps_nenvstr; /* the number of environment strings */ 45 }; 46 47 #if defined(__amd64__) || defined(__ia64__) 48 #include <compat/ia32/ia32_util.h> 49 #endif 50 51 #define FREEBSD32_PS_STRINGS \ 52 (FREEBSD32_USRSTACK - sizeof(struct freebsd32_ps_strings)) 53 54 static __inline caddr_t stackgap_init(void); 55 static __inline void *stackgap_alloc(caddr_t *, size_t); 56 57 static __inline caddr_t 58 stackgap_init() 59 { 60 #define szsigcode (*(curproc->p_sysent->sv_szsigcode)) 61 return (caddr_t)(((caddr_t)FREEBSD32_PS_STRINGS) - szsigcode - 62 SPARE_USRSPACE); 63 #undef szsigcode 64 } 65 66 static __inline void * 67 stackgap_alloc(sgp, sz) 68 caddr_t *sgp; 69 size_t sz; 70 { 71 void *p; 72 73 p = (void *) *sgp; 74 *sgp += ALIGN(sz); 75 return p; 76 } 77