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 ia32_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 #define IA32_USRSTACK (4L*1024*1024*1024 - PAGE_SIZE) 48 #define IA32_PS_STRINGS (IA32_USRSTACK - sizeof(struct ia32_ps_strings)) 49 50 static __inline caddr_t stackgap_init(void); 51 static __inline void *stackgap_alloc(caddr_t *, size_t); 52 53 static __inline caddr_t 54 stackgap_init() 55 { 56 #define szsigcode (*(curproc->p_sysent->sv_szsigcode)) 57 return (caddr_t)(((caddr_t)IA32_PS_STRINGS) - szsigcode - SPARE_USRSPACE); 58 #undef szsigcode 59 } 60 61 static __inline void * 62 stackgap_alloc(sgp, sz) 63 caddr_t *sgp; 64 size_t sz; 65 { 66 void *p; 67 68 p = (void *) *sgp; 69 *sgp += ALIGN(sz); 70 return p; 71 } 72 73 74 extern const char ia32_emul_path[]; 75 int ia32_emul_find(struct thread *, caddr_t *, const char *, char *, 76 char **, int); 77 78 #define CHECKALT(p, sgp, path, i) \ 79 do { \ 80 int _error; \ 81 \ 82 _error = ia32_emul_find(p, sgp, ia32_emul_path, path, \ 83 &path, i); \ 84 if (_error == EFAULT) \ 85 return (_error); \ 86 } while (0) 87 88 #define CHECKALTEXIST(p, sgp, path) CHECKALT((p), (sgp), (path), 0) 89 #define CHECKALTCREAT(p, sgp, path) CHECKALT((p), (sgp), (path), 1) 90