m68k4k_exec.c revision 1.4
1 /* $NetBSD: m68k4k_exec.c,v 1.4 2000/04/11 04:37:49 chs 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 <vm/vm.h> 58 59 #include <compat/m68k4k/m68k4k_exec.h> 60 61 #if defined(COMPAT_AOUT) 62 extern struct emul emul_netbsd_aout; 63 #endif 64 65 int exec_m68k4k_prep_zmagic __P((struct proc *, struct exec_package *)); 66 int exec_m68k4k_prep_nmagic __P((struct proc *, struct exec_package *)); 67 int exec_m68k4k_prep_omagic __P((struct proc *, struct exec_package *)); 68 69 /* 70 * exec_m68k4k_makecmds(): Check if it's an a.out-format executable 71 * with an m68k4k magic number. 72 * 73 * Given a proc pointer and an exec package pointer, see if the referent 74 * of the epp is in a.out format. Just check 'standard' magic numbers for 75 * this architecture. 76 * 77 * This function, in the former case, or the hook, in the latter, is 78 * responsible for creating a set of vmcmds which can be used to build 79 * the process's vm space and inserting them into the exec package. 80 */ 81 82 int 83 exec_m68k4k_makecmds(p, epp) 84 struct proc *p; 85 struct exec_package *epp; 86 { 87 u_long midmag, magic; 88 u_short mid; 89 int error; 90 struct exec *execp = epp->ep_hdr; 91 92 /* See note above... */ 93 if (M68K4K_LDPGSZ != NBPG) 94 return ENOEXEC; 95 96 if (epp->ep_hdrvalid < sizeof(struct exec)) 97 return ENOEXEC; 98 99 midmag = ntohl(execp->a_midmag); 100 mid = (midmag >> 16) & 0x3ff; 101 magic = midmag & 0xffff; 102 103 midmag = mid << 16 | magic; 104 105 switch (midmag) { 106 case (MID_M68K4K << 16) | ZMAGIC: 107 error = exec_m68k4k_prep_zmagic(p, epp); 108 break; 109 case (MID_M68K4K << 16) | NMAGIC: 110 error = exec_m68k4k_prep_nmagic(p, epp); 111 break; 112 case (MID_M68K4K << 16) | OMAGIC: 113 error = exec_m68k4k_prep_omagic(p, epp); 114 break; 115 default: 116 error = ENOEXEC; 117 } 118 119 if (error) 120 kill_vmcmds(&epp->ep_vmcmds); 121 #if defined(COMPAT_AOUT) 122 else 123 epp->ep_emul = &emul_netbsd_aout; 124 #endif 125 126 return error; 127 } 128 129 /* 130 * exec_m68k4k_prep_zmagic(): Prepare an m68k4k ZMAGIC binary's exec package 131 * 132 * First, set of the various offsets/lengths in the exec package. 133 * 134 * Then, mark the text image busy (so it can be demand paged) or error 135 * out if this is not possible. Finally, set up vmcmds for the 136 * text, data, bss, and stack segments. 137 */ 138 139 int 140 exec_m68k4k_prep_zmagic(p, epp) 141 struct proc *p; 142 struct exec_package *epp; 143 { 144 struct exec *execp = epp->ep_hdr; 145 146 epp->ep_taddr = M68K4K_USRTEXT; 147 epp->ep_tsize = execp->a_text; 148 epp->ep_daddr = epp->ep_taddr + execp->a_text; 149 epp->ep_dsize = execp->a_data + execp->a_bss; 150 epp->ep_entry = execp->a_entry; 151 152 /* 153 * check if vnode is in open for writing, because we want to 154 * demand-page out of it. if it is, don't do it, for various 155 * reasons 156 */ 157 if ((execp->a_text != 0 || execp->a_data != 0) && 158 epp->ep_vp->v_writecount != 0) { 159 #ifdef DIAGNOSTIC 160 if (epp->ep_vp->v_flag & VTEXT) 161 panic("exec: a VTEXT vnode has writecount != 0\n"); 162 #endif 163 return ETXTBSY; 164 } 165 vn_marktext(epp->ep_vp); 166 167 /* set up command for text segment */ 168 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text, 169 epp->ep_taddr, epp->ep_vp, 0, VM_PROT_READ|VM_PROT_EXECUTE); 170 171 /* set up command for data segment */ 172 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data, 173 epp->ep_daddr, epp->ep_vp, execp->a_text, 174 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 175 176 /* set up command for bss segment */ 177 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 178 epp->ep_daddr + execp->a_data, NULLVP, 0, 179 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 180 181 return exec_aout_setup_stack(p, epp); 182 } 183 184 /* 185 * exec_m68k4k_prep_nmagic(): Prepare a m68k4k NMAGIC binary's exec package 186 */ 187 188 int 189 exec_m68k4k_prep_nmagic(p, epp) 190 struct proc *p; 191 struct exec_package *epp; 192 { 193 struct exec *execp = epp->ep_hdr; 194 long bsize, baddr; 195 196 epp->ep_taddr = M68K4K_USRTEXT; 197 epp->ep_tsize = execp->a_text; 198 epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, 199 M68K4K_LDPGSZ); 200 epp->ep_dsize = execp->a_data + execp->a_bss; 201 epp->ep_entry = execp->a_entry; 202 203 /* set up command for text segment */ 204 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 205 epp->ep_taddr, epp->ep_vp, sizeof(struct exec), 206 VM_PROT_READ|VM_PROT_EXECUTE); 207 208 /* set up command for data segment */ 209 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 210 epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec), 211 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 212 213 /* set up command for bss segment */ 214 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 215 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 216 if (bsize > 0) 217 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 218 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 219 220 return exec_aout_setup_stack(p, epp); 221 } 222 223 /* 224 * exec_m68k4k_prep_omagic(): Prepare a m68k4k OMAGIC binary's exec package 225 */ 226 227 int 228 exec_m68k4k_prep_omagic(p, epp) 229 struct proc *p; 230 struct exec_package *epp; 231 { 232 struct exec *execp = epp->ep_hdr; 233 long dsize, bsize, baddr; 234 235 epp->ep_taddr = M68K4K_USRTEXT; 236 epp->ep_tsize = execp->a_text; 237 epp->ep_daddr = epp->ep_taddr + execp->a_text; 238 epp->ep_dsize = execp->a_data + execp->a_bss; 239 epp->ep_entry = execp->a_entry; 240 241 /* set up command for text and data segments */ 242 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 243 execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp, 244 sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 245 246 /* set up command for bss segment */ 247 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 248 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 249 if (bsize > 0) 250 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 251 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 252 253 /* 254 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize); 255 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are 256 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize' 257 * respectively to page boundaries. 258 * Compensate `ep_dsize' for the amount of data covered by the last 259 * text page. 260 */ 261 dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, NBPG); 262 epp->ep_dsize = (dsize > 0) ? dsize : 0; 263 return exec_aout_setup_stack(p, epp); 264 } 265
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