m68k4k_exec.c revision 1.5
1 /* $NetBSD: m68k4k_exec.c,v 1.5 2000/06/28 15:39:29 mrg 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 #if !defined(__m68k__) 44 #error YOU GOTTA BE KIDDING! 45 #endif 46 47 #include "opt_compat_aout.h" 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/proc.h> 52 #include <sys/malloc.h> 53 #include <sys/vnode.h> 54 #include <sys/exec.h> 55 #include <sys/resourcevar.h> 56 57 #include <compat/m68k4k/m68k4k_exec.h> 58 59 #if defined(COMPAT_AOUT) 60 extern struct emul emul_netbsd_aout; 61 #endif 62 63 int exec_m68k4k_prep_zmagic __P((struct proc *, struct exec_package *)); 64 int exec_m68k4k_prep_nmagic __P((struct proc *, struct exec_package *)); 65 int exec_m68k4k_prep_omagic __P((struct proc *, struct exec_package *)); 66 67 /* 68 * exec_m68k4k_makecmds(): Check if it's an a.out-format executable 69 * with an m68k4k magic number. 70 * 71 * Given a proc pointer and an exec package pointer, see if the referent 72 * of the epp is in a.out format. Just check 'standard' magic numbers for 73 * this architecture. 74 * 75 * This function, in the former case, or the hook, in the latter, is 76 * responsible for creating a set of vmcmds which can be used to build 77 * the process's vm space and inserting them into the exec package. 78 */ 79 80 int 81 exec_m68k4k_makecmds(p, epp) 82 struct proc *p; 83 struct exec_package *epp; 84 { 85 u_long midmag, magic; 86 u_short mid; 87 int error; 88 struct exec *execp = epp->ep_hdr; 89 90 /* See note above... */ 91 if (M68K4K_LDPGSZ != NBPG) 92 return ENOEXEC; 93 94 if (epp->ep_hdrvalid < sizeof(struct exec)) 95 return ENOEXEC; 96 97 midmag = ntohl(execp->a_midmag); 98 mid = (midmag >> 16) & 0x3ff; 99 magic = midmag & 0xffff; 100 101 midmag = mid << 16 | magic; 102 103 switch (midmag) { 104 case (MID_M68K4K << 16) | ZMAGIC: 105 error = exec_m68k4k_prep_zmagic(p, epp); 106 break; 107 case (MID_M68K4K << 16) | NMAGIC: 108 error = exec_m68k4k_prep_nmagic(p, epp); 109 break; 110 case (MID_M68K4K << 16) | OMAGIC: 111 error = exec_m68k4k_prep_omagic(p, epp); 112 break; 113 default: 114 error = ENOEXEC; 115 } 116 117 if (error) 118 kill_vmcmds(&epp->ep_vmcmds); 119 #if defined(COMPAT_AOUT) 120 else 121 epp->ep_emul = &emul_netbsd_aout; 122 #endif 123 124 return error; 125 } 126 127 /* 128 * exec_m68k4k_prep_zmagic(): Prepare an m68k4k ZMAGIC binary's exec package 129 * 130 * First, set of the various offsets/lengths in the exec package. 131 * 132 * Then, mark the text image busy (so it can be demand paged) or error 133 * out if this is not possible. Finally, set up vmcmds for the 134 * text, data, bss, and stack segments. 135 */ 136 137 int 138 exec_m68k4k_prep_zmagic(p, epp) 139 struct proc *p; 140 struct exec_package *epp; 141 { 142 struct exec *execp = epp->ep_hdr; 143 144 epp->ep_taddr = M68K4K_USRTEXT; 145 epp->ep_tsize = execp->a_text; 146 epp->ep_daddr = epp->ep_taddr + execp->a_text; 147 epp->ep_dsize = execp->a_data + execp->a_bss; 148 epp->ep_entry = execp->a_entry; 149 150 /* 151 * check if vnode is in open for writing, because we want to 152 * demand-page out of it. if it is, don't do it, for various 153 * reasons 154 */ 155 if ((execp->a_text != 0 || execp->a_data != 0) && 156 epp->ep_vp->v_writecount != 0) { 157 #ifdef DIAGNOSTIC 158 if (epp->ep_vp->v_flag & VTEXT) 159 panic("exec: a VTEXT vnode has writecount != 0\n"); 160 #endif 161 return ETXTBSY; 162 } 163 vn_marktext(epp->ep_vp); 164 165 /* set up command for text segment */ 166 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text, 167 epp->ep_taddr, epp->ep_vp, 0, VM_PROT_READ|VM_PROT_EXECUTE); 168 169 /* set up command for data segment */ 170 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data, 171 epp->ep_daddr, epp->ep_vp, execp->a_text, 172 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 173 174 /* set up command for bss segment */ 175 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 176 epp->ep_daddr + execp->a_data, NULLVP, 0, 177 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 178 179 return exec_aout_setup_stack(p, epp); 180 } 181 182 /* 183 * exec_m68k4k_prep_nmagic(): Prepare a m68k4k NMAGIC binary's exec package 184 */ 185 186 int 187 exec_m68k4k_prep_nmagic(p, epp) 188 struct proc *p; 189 struct exec_package *epp; 190 { 191 struct exec *execp = epp->ep_hdr; 192 long bsize, baddr; 193 194 epp->ep_taddr = M68K4K_USRTEXT; 195 epp->ep_tsize = execp->a_text; 196 epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, 197 M68K4K_LDPGSZ); 198 epp->ep_dsize = execp->a_data + execp->a_bss; 199 epp->ep_entry = execp->a_entry; 200 201 /* set up command for text segment */ 202 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 203 epp->ep_taddr, epp->ep_vp, sizeof(struct exec), 204 VM_PROT_READ|VM_PROT_EXECUTE); 205 206 /* set up command for data segment */ 207 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 208 epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec), 209 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 210 211 /* set up command for bss segment */ 212 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 213 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 214 if (bsize > 0) 215 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 216 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 217 218 return exec_aout_setup_stack(p, epp); 219 } 220 221 /* 222 * exec_m68k4k_prep_omagic(): Prepare a m68k4k OMAGIC binary's exec package 223 */ 224 225 int 226 exec_m68k4k_prep_omagic(p, epp) 227 struct proc *p; 228 struct exec_package *epp; 229 { 230 struct exec *execp = epp->ep_hdr; 231 long dsize, bsize, baddr; 232 233 epp->ep_taddr = M68K4K_USRTEXT; 234 epp->ep_tsize = execp->a_text; 235 epp->ep_daddr = epp->ep_taddr + execp->a_text; 236 epp->ep_dsize = execp->a_data + execp->a_bss; 237 epp->ep_entry = execp->a_entry; 238 239 /* set up command for text and data segments */ 240 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 241 execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp, 242 sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 243 244 /* set up command for bss segment */ 245 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 246 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 247 if (bsize > 0) 248 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 249 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 250 251 /* 252 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize); 253 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are 254 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize' 255 * respectively to page boundaries. 256 * Compensate `ep_dsize' for the amount of data covered by the last 257 * text page. 258 */ 259 dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, NBPG); 260 epp->ep_dsize = (dsize > 0) ? dsize : 0; 261 return exec_aout_setup_stack(p, epp); 262 } 263
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