netbsd32_exec_aout.c revision 1.1
1 /* $NetBSD: netbsd32_exec_aout.c,v 1.1 2000/12/01 21:51:09 jdolecek 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 64 /* 65 * exec_netbsd32_makecmds(): Check if it's an netbsd32 a.out format 66 * executable. 67 * 68 * Given a proc pointer and an exec package pointer, see if the referent 69 * of the epp is in netbsd32 a.out format. Check 'standard' magic 70 * numbers for this architecture. 71 * 72 * This function, in the former case, or the hook, in the latter, is 73 * responsible for creating a set of vmcmds which can be used to build 74 * the process's vm space and inserting them into the exec package. 75 */ 76 77 int 78 exec_netbsd32_makecmds(p, epp) 79 struct proc *p; 80 struct exec_package *epp; 81 { 82 netbsd32_u_long midmag, magic; 83 u_short mid; 84 int error; 85 struct netbsd32_exec *execp = epp->ep_hdr; 86 87 if (epp->ep_hdrvalid < sizeof(struct netbsd32_exec)) 88 return ENOEXEC; 89 90 midmag = (netbsd32_u_long)ntohl(execp->a_midmag); 91 mid = (midmag >> 16) & 0x3ff; 92 magic = midmag & 0xffff; 93 94 midmag = mid << 16 | magic; 95 96 switch (midmag) { 97 case (MID_SPARC << 16) | ZMAGIC: 98 error = netbsd32_exec_aout_prep_zmagic(p, epp); 99 break; 100 case (MID_SPARC << 16) | NMAGIC: 101 error = netbsd32_exec_aout_prep_nmagic(p, epp); 102 break; 103 case (MID_SPARC << 16) | OMAGIC: 104 error = netbsd32_exec_aout_prep_omagic(p, epp); 105 break; 106 default: 107 /* Invalid magic */ 108 error = ENOEXEC; 109 break; 110 } 111 112 if (error == 0) { 113 /* set up our emulation information */ 114 epp->ep_flags |= EXEC_32; 115 } else 116 kill_vmcmds(&epp->ep_vmcmds); 117 118 return error; 119 } 120 121 /* 122 * netbsd32_exec_aout_prep_zmagic(): Prepare a 'native' ZMAGIC binary's 123 * exec package 124 * 125 * First, set of the various offsets/lengths in the exec package. 126 * 127 * Then, mark the text image busy (so it can be demand paged) or error 128 * out if this is not possible. Finally, set up vmcmds for the 129 * text, data, bss, and stack segments. 130 */ 131 132 int 133 netbsd32_exec_aout_prep_zmagic(p, epp) 134 struct proc *p; 135 struct exec_package *epp; 136 { 137 struct netbsd32_exec *execp = epp->ep_hdr; 138 139 epp->ep_taddr = USRTEXT; 140 epp->ep_tsize = execp->a_text; 141 epp->ep_daddr = epp->ep_taddr + execp->a_text; 142 epp->ep_dsize = execp->a_data + execp->a_bss; 143 epp->ep_entry = execp->a_entry; 144 145 /* 146 * check if vnode is in open for writing, because we want to 147 * demand-page out of it. if it is, don't do it, for various 148 * reasons 149 */ 150 if ((execp->a_text != 0 || execp->a_data != 0) && 151 epp->ep_vp->v_writecount != 0) { 152 #ifdef DIAGNOSTIC 153 if (epp->ep_vp->v_flag & VTEXT) 154 panic("exec: a VTEXT vnode has writecount != 0\n"); 155 #endif 156 return ETXTBSY; 157 } 158 vn_marktext(epp->ep_vp); 159 160 /* set up command for text segment */ 161 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text, 162 epp->ep_taddr, epp->ep_vp, 0, VM_PROT_READ|VM_PROT_EXECUTE); 163 164 /* set up command for data segment */ 165 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data, 166 epp->ep_daddr, epp->ep_vp, execp->a_text, 167 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 168 169 /* set up command for bss segment */ 170 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 171 epp->ep_daddr + execp->a_data, NULLVP, 0, 172 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 173 174 return exec_aout_setup_stack(p, epp); 175 } 176 177 /* 178 * netbsd32_exec_aout_prep_nmagic(): Prepare a 'native' NMAGIC binary's 179 * exec package 180 */ 181 182 int 183 netbsd32_exec_aout_prep_nmagic(p, epp) 184 struct proc *p; 185 struct exec_package *epp; 186 { 187 struct netbsd32_exec *execp = epp->ep_hdr; 188 long bsize, baddr; 189 190 epp->ep_taddr = USRTEXT; 191 epp->ep_tsize = execp->a_text; 192 epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, __LDPGSZ); 193 epp->ep_dsize = execp->a_data + execp->a_bss; 194 epp->ep_entry = execp->a_entry; 195 196 /* set up command for text segment */ 197 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 198 epp->ep_taddr, epp->ep_vp, sizeof(struct exec), 199 VM_PROT_READ|VM_PROT_EXECUTE); 200 201 /* set up command for data segment */ 202 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 203 epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec), 204 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 205 206 /* set up command for bss segment */ 207 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 208 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 209 if (bsize > 0) 210 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 211 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 212 213 return exec_aout_setup_stack(p, epp); 214 } 215 216 /* 217 * netbsd32_exec_aout_prep_omagic(): Prepare a 'native' OMAGIC binary's 218 * exec package 219 */ 220 221 int 222 netbsd32_exec_aout_prep_omagic(p, epp) 223 struct proc *p; 224 struct exec_package *epp; 225 { 226 struct netbsd32_exec *execp = epp->ep_hdr; 227 long dsize, bsize, baddr; 228 229 epp->ep_taddr = USRTEXT; 230 epp->ep_tsize = execp->a_text; 231 epp->ep_daddr = epp->ep_taddr + execp->a_text; 232 epp->ep_dsize = execp->a_data + execp->a_bss; 233 epp->ep_entry = execp->a_entry; 234 235 /* set up command for text and data segments */ 236 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 237 execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp, 238 sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 239 240 /* set up command for bss segment */ 241 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 242 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 243 if (bsize > 0) 244 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 245 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 246 247 /* 248 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize); 249 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are 250 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize' 251 * respectively to page boundaries. 252 * Compensate `ep_dsize' for the amount of data covered by the last 253 * text page. 254 */ 255 dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, NBPG); 256 epp->ep_dsize = (dsize > 0) ? dsize : 0; 257 return exec_aout_setup_stack(p, epp); 258 } 259
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