1 /* $NetBSD: netbsd32_exec_aout.c,v 1.8 2001/11/13 02:09:05 lukem Exp $ */ 2 /* from: NetBSD: exec_aout.c,v 1.15 1996/09/26 23:34:46 cgd Exp */ 3 4 /* 5 * Copyright (c) 1998, 2001 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/cdefs.h> 36 __KERNEL_RCSID(0, "$NetBSD: netbsd32_exec_aout.c,v 1.8 2001/11/13 02:09:05 lukem Exp $"); 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/proc.h> 41 #include <sys/malloc.h> 42 #include <sys/vnode.h> 43 #include <sys/exec.h> 44 #include <sys/resourcevar.h> 45 #include <sys/signal.h> 46 #include <sys/signalvar.h> 47 48 #include <compat/netbsd32/netbsd32.h> 49 #ifndef EXEC_AOUT 50 #define EXEC_AOUT 51 #endif 52 #include <compat/netbsd32/netbsd32_exec.h> 53 54 #include <machine/frame.h> 55 #include <machine/netbsd32_machdep.h> 56 57 int netbsd32_copyinargs __P((struct exec_package *, struct ps_strings *, 58 void *, size_t, const void *, const void *)); 59 60 int netbsd32_exec_aout_setup_stack __P((struct proc *p, 61 struct exec_package *epp)); 62 63 /* 64 * exec_netbsd32_makecmds(): Check if it's an netbsd32 a.out format 65 * executable. 66 * 67 * Given a proc pointer and an exec package pointer, see if the referent 68 * of the epp is in netbsd32 a.out format. Check 'standard' magic 69 * numbers for this architecture. 70 * 71 * This function, in the former case, or the hook, in the latter, is 72 * responsible for creating a set of vmcmds which can be used to build 73 * the process's vm space and inserting them into the exec package. 74 */ 75 76 int 77 exec_netbsd32_makecmds(p, epp) 78 struct proc *p; 79 struct exec_package *epp; 80 { 81 netbsd32_u_long midmag, magic; 82 u_short mid; 83 int error; 84 struct netbsd32_exec *execp = epp->ep_hdr; 85 86 if (epp->ep_hdrvalid < sizeof(struct netbsd32_exec)) 87 return ENOEXEC; 88 89 midmag = (netbsd32_u_long)ntohl(execp->a_midmag); 90 mid = (midmag >> 16) & 0x3ff; 91 magic = midmag & 0xffff; 92 93 midmag = mid << 16 | magic; 94 95 switch (midmag) { 96 case (MID_SPARC << 16) | ZMAGIC: 97 error = netbsd32_exec_aout_prep_zmagic(p, epp); 98 break; 99 case (MID_SPARC << 16) | NMAGIC: 100 error = netbsd32_exec_aout_prep_nmagic(p, epp); 101 break; 102 case (MID_SPARC << 16) | OMAGIC: 103 error = netbsd32_exec_aout_prep_omagic(p, epp); 104 break; 105 default: 106 /* Invalid magic */ 107 error = ENOEXEC; 108 break; 109 } 110 111 if (error == 0) { 112 /* set up our emulation information */ 113 epp->ep_flags |= EXEC_32; 114 } else 115 kill_vmcmds(&epp->ep_vmcmds); 116 117 return error; 118 } 119 120 /* 121 * netbsd32_exec_aout_prep_zmagic(): Prepare a 'native' ZMAGIC binary's 122 * exec package 123 * 124 * First, set of the various offsets/lengths in the exec package. 125 * 126 * Then, mark the text image busy (so it can be demand paged) or error 127 * out if this is not possible. Finally, set up vmcmds for the 128 * text, data, bss, and stack segments. 129 */ 130 131 int 132 netbsd32_exec_aout_prep_zmagic(p, epp) 133 struct proc *p; 134 struct exec_package *epp; 135 { 136 struct netbsd32_exec *execp = epp->ep_hdr; 137 138 epp->ep_taddr = USRTEXT; 139 epp->ep_tsize = execp->a_text; 140 epp->ep_daddr = epp->ep_taddr + execp->a_text; 141 epp->ep_dsize = execp->a_data + execp->a_bss; 142 epp->ep_entry = execp->a_entry; 143 epp->ep_vm_minaddr = VM_MIN_ADDRESS; 144 epp->ep_vm_maxaddr = VM_MAXUSER_ADDRESS32; 145 146 /* 147 * check if vnode is in open for writing, because we want to 148 * demand-page out of it. if it is, don't do it, for various 149 * reasons 150 */ 151 if ((execp->a_text != 0 || execp->a_data != 0) && 152 epp->ep_vp->v_writecount != 0) { 153 #ifdef DIAGNOSTIC 154 if (epp->ep_vp->v_flag & VTEXT) 155 panic("exec: a VTEXT vnode has writecount != 0\n"); 156 #endif 157 return ETXTBSY; 158 } 159 epp->ep_vp->v_flag |= VTEXT; 160 161 /* set up command for text segment */ 162 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text, 163 epp->ep_taddr, epp->ep_vp, 0, VM_PROT_READ|VM_PROT_EXECUTE); 164 165 /* set up command for data segment */ 166 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data, 167 epp->ep_daddr, epp->ep_vp, execp->a_text, 168 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 169 170 /* set up command for bss segment */ 171 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 172 epp->ep_daddr + execp->a_data, NULLVP, 0, 173 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 174 175 return netbsd32_exec_aout_setup_stack(p, epp); 176 } 177 178 /* 179 * netbsd32_exec_aout_prep_nmagic(): Prepare a 'native' NMAGIC binary's 180 * exec package 181 */ 182 183 int 184 netbsd32_exec_aout_prep_nmagic(p, epp) 185 struct proc *p; 186 struct exec_package *epp; 187 { 188 struct netbsd32_exec *execp = epp->ep_hdr; 189 long bsize, baddr; 190 191 epp->ep_taddr = USRTEXT; 192 epp->ep_tsize = execp->a_text; 193 epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, __LDPGSZ); 194 epp->ep_dsize = execp->a_data + execp->a_bss; 195 epp->ep_entry = execp->a_entry; 196 epp->ep_vm_minaddr = VM_MIN_ADDRESS; 197 epp->ep_vm_maxaddr = VM_MAXUSER_ADDRESS32; 198 199 /* set up command for text segment */ 200 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 201 epp->ep_taddr, epp->ep_vp, sizeof(struct netbsd32_exec), 202 VM_PROT_READ|VM_PROT_EXECUTE); 203 204 /* set up command for data segment */ 205 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 206 epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct netbsd32_exec), 207 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 208 209 /* set up command for bss segment */ 210 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 211 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 212 if (bsize > 0) 213 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 214 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 215 216 return netbsd32_exec_aout_setup_stack(p, epp); 217 } 218 219 /* 220 * netbsd32_exec_aout_prep_omagic(): Prepare a 'native' OMAGIC binary's 221 * exec package 222 */ 223 224 int 225 netbsd32_exec_aout_prep_omagic(p, epp) 226 struct proc *p; 227 struct exec_package *epp; 228 { 229 struct netbsd32_exec *execp = epp->ep_hdr; 230 long dsize, bsize, baddr; 231 232 epp->ep_taddr = USRTEXT; 233 epp->ep_tsize = execp->a_text; 234 epp->ep_daddr = epp->ep_taddr + execp->a_text; 235 epp->ep_dsize = execp->a_data + execp->a_bss; 236 epp->ep_entry = execp->a_entry; 237 epp->ep_vm_minaddr = VM_MIN_ADDRESS; 238 epp->ep_vm_maxaddr = VM_MAXUSER_ADDRESS32; 239 240 /* set up command for text and data segments */ 241 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 242 execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp, 243 sizeof(struct netbsd32_exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 244 245 /* set up command for bss segment */ 246 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 247 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 248 if (bsize > 0) 249 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 250 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 251 252 /* 253 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize); 254 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are 255 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize' 256 * respectively to page boundaries. 257 * Compensate `ep_dsize' for the amount of data covered by the last 258 * text page. 259 */ 260 dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, NBPG); 261 epp->ep_dsize = (dsize > 0) ? dsize : 0; 262 return netbsd32_exec_aout_setup_stack(p, epp); 263 } 264 265 /* 266 * netbsd32_exec_aout_setup_stack(): Set up the stack segment for an a.out 267 * executable. 268 * 269 * Note that the ep_ssize parameter must be set to be the current stack 270 * limit; this is adjusted in the body of execve() to yield the 271 * appropriate stack segment usage once the argument length is 272 * calculated. 273 * 274 * This function returns an int for uniformity with other (future) formats' 275 * stack setup functions. They might have errors to return. 276 */ 277 int 278 netbsd32_exec_aout_setup_stack(struct proc *p, struct exec_package *epp) 279 { 280 281 epp->ep_maxsaddr = USRSTACK32 - MAXSSIZ; 282 epp->ep_minsaddr = USRSTACK32; 283 epp->ep_ssize = p->p_rlimit[RLIMIT_STACK].rlim_cur; 284 285 /* 286 * set up commands for stack. note that this takes *two*, one to 287 * map the part of the stack which we can access, and one to map 288 * the part which we can't. 289 * 290 * arguably, it could be made into one, but that would require the 291 * addition of another mapping proc, which is unnecessary 292 * 293 * note that in memory, things assumed to be: 0 ... ep_maxsaddr 294 * <stack> ep_minsaddr 295 */ 296 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, 297 ((epp->ep_minsaddr - epp->ep_ssize) - epp->ep_maxsaddr), 298 epp->ep_maxsaddr, NULLVP, 0, VM_PROT_NONE); 299 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, epp->ep_ssize, 300 (epp->ep_minsaddr - epp->ep_ssize), NULLVP, 0, 301 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 302 303 return 0; 304 } 305