1 /* $NetBSD: m68k4k_exec.c,v 1.8 2001/11/13 02:09:02 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1993, 1994 Christopher G. Demetriou 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Christopher G. Demetriou. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Exec glue to provide compatibility with older NetBSD m68k4k exectuables. 35 * 36 * Taken directly from kern/exec_aout.c and frobbed to map text and 37 * data as m68k4k executables expect. 38 * 39 * This module only works on machines with NBPG == 4096. It's not clear 40 * that making it work on other machines is worth the trouble. 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: m68k4k_exec.c,v 1.8 2001/11/13 02:09:02 lukem Exp $"); 45 46 #if !defined(__m68k__) 47 #error YOU GOTTA BE KIDDING! 48 #endif 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/proc.h> 53 #include <sys/malloc.h> 54 #include <sys/vnode.h> 55 #include <sys/exec.h> 56 #include <sys/resourcevar.h> 57 58 #include <compat/m68k4k/m68k4k_exec.h> 59 60 int exec_m68k4k_prep_zmagic __P((struct proc *, struct exec_package *)); 61 int exec_m68k4k_prep_nmagic __P((struct proc *, struct exec_package *)); 62 int exec_m68k4k_prep_omagic __P((struct proc *, struct exec_package *)); 63 64 /* 65 * exec_m68k4k_makecmds(): Check if it's an a.out-format executable 66 * with an m68k4k magic number. 67 * 68 * Given a proc pointer and an exec package pointer, see if the referent 69 * of the epp is in a.out format. Just check 'standard' magic numbers for 70 * 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_m68k4k_makecmds(p, epp) 79 struct proc *p; 80 struct exec_package *epp; 81 { 82 u_long midmag, magic; 83 u_short mid; 84 int error; 85 struct exec *execp = epp->ep_hdr; 86 87 /* See note above... */ 88 if (M68K4K_LDPGSZ != NBPG) 89 return ENOEXEC; 90 91 if (epp->ep_hdrvalid < sizeof(struct exec)) 92 return ENOEXEC; 93 94 midmag = ntohl(execp->a_midmag); 95 mid = (midmag >> 16) & 0x3ff; 96 magic = midmag & 0xffff; 97 98 midmag = mid << 16 | magic; 99 100 switch (midmag) { 101 case (MID_M68K4K << 16) | ZMAGIC: 102 error = exec_m68k4k_prep_zmagic(p, epp); 103 break; 104 case (MID_M68K4K << 16) | NMAGIC: 105 error = exec_m68k4k_prep_nmagic(p, epp); 106 break; 107 case (MID_M68K4K << 16) | OMAGIC: 108 error = exec_m68k4k_prep_omagic(p, epp); 109 break; 110 default: 111 error = ENOEXEC; 112 } 113 114 if (error) 115 kill_vmcmds(&epp->ep_vmcmds); 116 117 return error; 118 } 119 120 /* 121 * exec_m68k4k_prep_zmagic(): Prepare an m68k4k ZMAGIC binary's exec package 122 * 123 * First, set of the various offsets/lengths in the exec package. 124 * 125 * Then, mark the text image busy (so it can be demand paged) or error 126 * out if this is not possible. Finally, set up vmcmds for the 127 * text, data, bss, and stack segments. 128 */ 129 130 int 131 exec_m68k4k_prep_zmagic(p, epp) 132 struct proc *p; 133 struct exec_package *epp; 134 { 135 struct exec *execp = epp->ep_hdr; 136 137 epp->ep_taddr = M68K4K_USRTEXT; 138 epp->ep_tsize = execp->a_text; 139 epp->ep_daddr = epp->ep_taddr + execp->a_text; 140 epp->ep_dsize = execp->a_data + execp->a_bss; 141 epp->ep_entry = execp->a_entry; 142 143 /* 144 * check if vnode is in open for writing, because we want to 145 * demand-page out of it. if it is, don't do it, for various 146 * reasons 147 */ 148 if ((execp->a_text != 0 || execp->a_data != 0) && 149 epp->ep_vp->v_writecount != 0) { 150 #ifdef DIAGNOSTIC 151 if (epp->ep_vp->v_flag & VTEXT) 152 panic("exec: a VTEXT vnode has writecount != 0\n"); 153 #endif 154 return ETXTBSY; 155 } 156 epp->ep_vp->v_flag |= VTEXT; 157 158 /* set up command for text segment */ 159 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text, 160 epp->ep_taddr, epp->ep_vp, 0, VM_PROT_READ|VM_PROT_EXECUTE); 161 162 /* set up command for data segment */ 163 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data, 164 epp->ep_daddr, epp->ep_vp, execp->a_text, 165 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 166 167 /* set up command for bss segment */ 168 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 169 epp->ep_daddr + execp->a_data, NULLVP, 0, 170 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 171 172 return exec_aout_setup_stack(p, epp); 173 } 174 175 /* 176 * exec_m68k4k_prep_nmagic(): Prepare a m68k4k NMAGIC binary's exec package 177 */ 178 179 int 180 exec_m68k4k_prep_nmagic(p, epp) 181 struct proc *p; 182 struct exec_package *epp; 183 { 184 struct exec *execp = epp->ep_hdr; 185 long bsize, baddr; 186 187 epp->ep_taddr = M68K4K_USRTEXT; 188 epp->ep_tsize = execp->a_text; 189 epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, 190 M68K4K_LDPGSZ); 191 epp->ep_dsize = execp->a_data + execp->a_bss; 192 epp->ep_entry = execp->a_entry; 193 194 /* set up command for text segment */ 195 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 196 epp->ep_taddr, epp->ep_vp, sizeof(struct exec), 197 VM_PROT_READ|VM_PROT_EXECUTE); 198 199 /* set up command for data segment */ 200 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 201 epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec), 202 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 203 204 /* set up command for bss segment */ 205 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 206 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 207 if (bsize > 0) 208 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 209 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 210 211 return exec_aout_setup_stack(p, epp); 212 } 213 214 /* 215 * exec_m68k4k_prep_omagic(): Prepare a m68k4k OMAGIC binary's exec package 216 */ 217 218 int 219 exec_m68k4k_prep_omagic(p, epp) 220 struct proc *p; 221 struct exec_package *epp; 222 { 223 struct exec *execp = epp->ep_hdr; 224 long dsize, bsize, baddr; 225 226 epp->ep_taddr = M68K4K_USRTEXT; 227 epp->ep_tsize = execp->a_text; 228 epp->ep_daddr = epp->ep_taddr + execp->a_text; 229 epp->ep_dsize = execp->a_data + execp->a_bss; 230 epp->ep_entry = execp->a_entry; 231 232 /* set up command for text and data segments */ 233 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 234 execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp, 235 sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 236 237 /* set up command for bss segment */ 238 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 239 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 240 if (bsize > 0) 241 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 242 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 243 244 /* 245 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize); 246 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are 247 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize' 248 * respectively to page boundaries. 249 * Compensate `ep_dsize' for the amount of data covered by the last 250 * text page. 251 */ 252 dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, NBPG); 253 epp->ep_dsize = (dsize > 0) ? dsize : 0; 254 return exec_aout_setup_stack(p, epp); 255 } 256