1 /* $NetBSD: netbsd32_exec_aout.c,v 1.2 2000/12/18 14:50:04 mrg Exp $ */ 2 /* from: NetBSD: exec_aout.c,v 1.15 1996/09/26 23:34:46 cgd Exp */ 3 4 /* 5 * Copyright (c) 1998 Matthew R. Green. 6 * Copyright (c) 1993, 1994 Christopher G. Demetriou 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by Christopher G. Demetriou. 20 * 4. The name of the author may not be used to endorse or promote products 21 * derived from this software without specific prior written permission 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/proc.h> 38 #include <sys/malloc.h> 39 #include <sys/vnode.h> 40 #include <sys/exec.h> 41 #include <sys/resourcevar.h> 42 #include <sys/signal.h> 43 #include <sys/signalvar.h> 44 45 #include <compat/netbsd32/netbsd32.h> 46 #ifndef EXEC_AOUT 47 #define EXEC_AOUT 48 #endif 49 #include <compat/netbsd32/netbsd32_exec.h> 50 51 #include <machine/frame.h> 52 #include <machine/netbsd32_machdep.h> 53 54 int netbsd32_copyinargs __P((struct exec_package *, struct ps_strings *, 55 void *, size_t, const void *, const void *)); 56 57 static int netbsd32_exec_aout_prep_zmagic __P((struct proc *, 58 struct exec_package *)); 59 static int netbsd32_exec_aout_prep_nmagic __P((struct proc *, 60 struct exec_package *)); 61 static int netbsd32_exec_aout_prep_omagic __P((struct proc *, 62 struct exec_package *)); 63 int netbsd32_exec_aout_setup_stack __P((struct proc *p, 64 struct exec_package *epp)); 65 66 /* 67 * exec_netbsd32_makecmds(): Check if it's an netbsd32 a.out format 68 * executable. 69 * 70 * Given a proc pointer and an exec package pointer, see if the referent 71 * of the epp is in netbsd32 a.out format. Check 'standard' magic 72 * numbers for this architecture. 73 * 74 * This function, in the former case, or the hook, in the latter, is 75 * responsible for creating a set of vmcmds which can be used to build 76 * the process's vm space and inserting them into the exec package. 77 */ 78 79 int 80 exec_netbsd32_makecmds(p, epp) 81 struct proc *p; 82 struct exec_package *epp; 83 { 84 netbsd32_u_long midmag, magic; 85 u_short mid; 86 int error; 87 struct netbsd32_exec *execp = epp->ep_hdr; 88 89 if (epp->ep_hdrvalid < sizeof(struct netbsd32_exec)) 90 return ENOEXEC; 91 92 midmag = (netbsd32_u_long)ntohl(execp->a_midmag); 93 mid = (midmag >> 16) & 0x3ff; 94 magic = midmag & 0xffff; 95 96 midmag = mid << 16 | magic; 97 98 switch (midmag) { 99 case (MID_SPARC << 16) | ZMAGIC: 100 error = netbsd32_exec_aout_prep_zmagic(p, epp); 101 break; 102 case (MID_SPARC << 16) | NMAGIC: 103 error = netbsd32_exec_aout_prep_nmagic(p, epp); 104 break; 105 case (MID_SPARC << 16) | OMAGIC: 106 error = netbsd32_exec_aout_prep_omagic(p, epp); 107 break; 108 default: 109 /* Invalid magic */ 110 error = ENOEXEC; 111 break; 112 } 113 114 if (error == 0) { 115 /* set up our emulation information */ 116 epp->ep_flags |= EXEC_32; 117 } else 118 kill_vmcmds(&epp->ep_vmcmds); 119 120 return error; 121 } 122 123 /* 124 * netbsd32_exec_aout_prep_zmagic(): Prepare a 'native' ZMAGIC binary's 125 * exec package 126 * 127 * First, set of the various offsets/lengths in the exec package. 128 * 129 * Then, mark the text image busy (so it can be demand paged) or error 130 * out if this is not possible. Finally, set up vmcmds for the 131 * text, data, bss, and stack segments. 132 */ 133 134 int 135 netbsd32_exec_aout_prep_zmagic(p, epp) 136 struct proc *p; 137 struct exec_package *epp; 138 { 139 struct netbsd32_exec *execp = epp->ep_hdr; 140 141 epp->ep_taddr = USRTEXT; 142 epp->ep_tsize = execp->a_text; 143 epp->ep_daddr = epp->ep_taddr + execp->a_text; 144 epp->ep_dsize = execp->a_data + execp->a_bss; 145 epp->ep_entry = execp->a_entry; 146 147 /* 148 * check if vnode is in open for writing, because we want to 149 * demand-page out of it. if it is, don't do it, for various 150 * reasons 151 */ 152 if ((execp->a_text != 0 || execp->a_data != 0) && 153 epp->ep_vp->v_writecount != 0) { 154 #ifdef DIAGNOSTIC 155 if (epp->ep_vp->v_flag & VTEXT) 156 panic("exec: a VTEXT vnode has writecount != 0\n"); 157 #endif 158 return ETXTBSY; 159 } 160 vn_marktext(epp->ep_vp); 161 162 /* set up command for text segment */ 163 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text, 164 epp->ep_taddr, epp->ep_vp, 0, VM_PROT_READ|VM_PROT_EXECUTE); 165 166 /* set up command for data segment */ 167 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data, 168 epp->ep_daddr, epp->ep_vp, execp->a_text, 169 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 170 171 /* set up command for bss segment */ 172 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 173 epp->ep_daddr + execp->a_data, NULLVP, 0, 174 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 175 176 return netbsd32_exec_aout_setup_stack(p, epp); 177 } 178 179 /* 180 * netbsd32_exec_aout_prep_nmagic(): Prepare a 'native' NMAGIC binary's 181 * exec package 182 */ 183 184 int 185 netbsd32_exec_aout_prep_nmagic(p, epp) 186 struct proc *p; 187 struct exec_package *epp; 188 { 189 struct netbsd32_exec *execp = epp->ep_hdr; 190 long bsize, baddr; 191 192 epp->ep_taddr = USRTEXT; 193 epp->ep_tsize = execp->a_text; 194 epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, __LDPGSZ); 195 epp->ep_dsize = execp->a_data + execp->a_bss; 196 epp->ep_entry = execp->a_entry; 197 198 /* set up command for text segment */ 199 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 200 epp->ep_taddr, epp->ep_vp, sizeof(struct exec), 201 VM_PROT_READ|VM_PROT_EXECUTE); 202 203 /* set up command for data segment */ 204 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 205 epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec), 206 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 207 208 /* set up command for bss segment */ 209 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 210 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 211 if (bsize > 0) 212 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 213 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 214 215 return netbsd32_exec_aout_setup_stack(p, epp); 216 } 217 218 /* 219 * netbsd32_exec_aout_prep_omagic(): Prepare a 'native' OMAGIC binary's 220 * exec package 221 */ 222 223 int 224 netbsd32_exec_aout_prep_omagic(p, epp) 225 struct proc *p; 226 struct exec_package *epp; 227 { 228 struct netbsd32_exec *execp = epp->ep_hdr; 229 long dsize, bsize, baddr; 230 231 epp->ep_taddr = USRTEXT; 232 epp->ep_tsize = execp->a_text; 233 epp->ep_daddr = epp->ep_taddr + execp->a_text; 234 epp->ep_dsize = execp->a_data + execp->a_bss; 235 epp->ep_entry = execp->a_entry; 236 237 /* set up command for text and data segments */ 238 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 239 execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp, 240 sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 241 242 /* set up command for bss segment */ 243 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 244 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 245 if (bsize > 0) 246 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 247 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 248 249 /* 250 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize); 251 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are 252 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize' 253 * respectively to page boundaries. 254 * Compensate `ep_dsize' for the amount of data covered by the last 255 * text page. 256 */ 257 dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, NBPG); 258 epp->ep_dsize = (dsize > 0) ? dsize : 0; 259 return netbsd32_exec_aout_setup_stack(p, epp); 260 } 261 262 /* 263 * netbsd32_exec_aout_setup_stack(): Set up the stack segment for an a.out 264 * executable. 265 * 266 * Note that the ep_ssize parameter must be set to be the current stack 267 * limit; this is adjusted in the body of execve() to yield the 268 * appropriate stack segment usage once the argument length is 269 * calculated. 270 * 271 * This function returns an int for uniformity with other (future) formats' 272 * stack setup functions. They might have errors to return. 273 */ 274 int 275 netbsd32_exec_aout_setup_stack(struct proc *p, struct exec_package *epp) 276 { 277 278 epp->ep_maxsaddr = USRSTACK32 - MAXSSIZ; 279 epp->ep_minsaddr = USRSTACK32; 280 epp->ep_ssize = p->p_rlimit[RLIMIT_STACK].rlim_cur; 281 282 /* 283 * set up commands for stack. note that this takes *two*, one to 284 * map the part of the stack which we can access, and one to map 285 * the part which we can't. 286 * 287 * arguably, it could be made into one, but that would require the 288 * addition of another mapping proc, which is unnecessary 289 * 290 * note that in memory, things assumed to be: 0 ... ep_maxsaddr 291 * <stack> ep_minsaddr 292 */ 293 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, 294 ((epp->ep_minsaddr - epp->ep_ssize) - epp->ep_maxsaddr), 295 epp->ep_maxsaddr, NULLVP, 0, VM_PROT_NONE); 296 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, epp->ep_ssize, 297 (epp->ep_minsaddr - epp->ep_ssize), NULLVP, 0, 298 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 299 300 return 0; 301 } 302