m68k4k_exec.c revision 1.3.8.2
1 /* $NetBSD: m68k4k_exec.c,v 1.3.8.2 2000/11/22 16:02:49 bouyer 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 <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/proc.h> 50 #include <sys/malloc.h> 51 #include <sys/vnode.h> 52 #include <sys/exec.h> 53 #include <sys/resourcevar.h> 54 55 #include <compat/m68k4k/m68k4k_exec.h> 56 57 int exec_m68k4k_prep_zmagic __P((struct proc *, struct exec_package *)); 58 int exec_m68k4k_prep_nmagic __P((struct proc *, struct exec_package *)); 59 int exec_m68k4k_prep_omagic __P((struct proc *, struct exec_package *)); 60 61 /* 62 * exec_m68k4k_makecmds(): Check if it's an a.out-format executable 63 * with an m68k4k magic number. 64 * 65 * Given a proc pointer and an exec package pointer, see if the referent 66 * of the epp is in a.out format. Just check 'standard' magic numbers for 67 * this architecture. 68 * 69 * This function, in the former case, or the hook, in the latter, is 70 * responsible for creating a set of vmcmds which can be used to build 71 * the process's vm space and inserting them into the exec package. 72 */ 73 74 int 75 exec_m68k4k_makecmds(p, epp) 76 struct proc *p; 77 struct exec_package *epp; 78 { 79 u_long midmag, magic; 80 u_short mid; 81 int error; 82 struct exec *execp = epp->ep_hdr; 83 84 /* See note above... */ 85 if (M68K4K_LDPGSZ != NBPG) 86 return ENOEXEC; 87 88 if (epp->ep_hdrvalid < sizeof(struct exec)) 89 return ENOEXEC; 90 91 midmag = ntohl(execp->a_midmag); 92 mid = (midmag >> 16) & 0x3ff; 93 magic = midmag & 0xffff; 94 95 midmag = mid << 16 | magic; 96 97 switch (midmag) { 98 case (MID_M68K4K << 16) | ZMAGIC: 99 error = exec_m68k4k_prep_zmagic(p, epp); 100 break; 101 case (MID_M68K4K << 16) | NMAGIC: 102 error = exec_m68k4k_prep_nmagic(p, epp); 103 break; 104 case (MID_M68K4K << 16) | OMAGIC: 105 error = exec_m68k4k_prep_omagic(p, epp); 106 break; 107 default: 108 error = ENOEXEC; 109 } 110 111 if (error) 112 kill_vmcmds(&epp->ep_vmcmds); 113 114 return error; 115 } 116 117 /* 118 * exec_m68k4k_prep_zmagic(): Prepare an m68k4k ZMAGIC binary's exec package 119 * 120 * First, set of the various offsets/lengths in the exec package. 121 * 122 * Then, mark the text image busy (so it can be demand paged) or error 123 * out if this is not possible. Finally, set up vmcmds for the 124 * text, data, bss, and stack segments. 125 */ 126 127 int 128 exec_m68k4k_prep_zmagic(p, epp) 129 struct proc *p; 130 struct exec_package *epp; 131 { 132 struct exec *execp = epp->ep_hdr; 133 134 epp->ep_taddr = M68K4K_USRTEXT; 135 epp->ep_tsize = execp->a_text; 136 epp->ep_daddr = epp->ep_taddr + execp->a_text; 137 epp->ep_dsize = execp->a_data + execp->a_bss; 138 epp->ep_entry = execp->a_entry; 139 140 /* 141 * check if vnode is in open for writing, because we want to 142 * demand-page out of it. if it is, don't do it, for various 143 * reasons 144 */ 145 if ((execp->a_text != 0 || execp->a_data != 0) && 146 epp->ep_vp->v_writecount != 0) { 147 #ifdef DIAGNOSTIC 148 if (epp->ep_vp->v_flag & VTEXT) 149 panic("exec: a VTEXT vnode has writecount != 0\n"); 150 #endif 151 return ETXTBSY; 152 } 153 vn_marktext(epp->ep_vp); 154 155 /* set up command for text segment */ 156 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text, 157 epp->ep_taddr, epp->ep_vp, 0, VM_PROT_READ|VM_PROT_EXECUTE); 158 159 /* set up command for data segment */ 160 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data, 161 epp->ep_daddr, epp->ep_vp, execp->a_text, 162 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 163 164 /* set up command for bss segment */ 165 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 166 epp->ep_daddr + execp->a_data, NULLVP, 0, 167 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 168 169 return exec_aout_setup_stack(p, epp); 170 } 171 172 /* 173 * exec_m68k4k_prep_nmagic(): Prepare a m68k4k NMAGIC binary's exec package 174 */ 175 176 int 177 exec_m68k4k_prep_nmagic(p, epp) 178 struct proc *p; 179 struct exec_package *epp; 180 { 181 struct exec *execp = epp->ep_hdr; 182 long bsize, baddr; 183 184 epp->ep_taddr = M68K4K_USRTEXT; 185 epp->ep_tsize = execp->a_text; 186 epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, 187 M68K4K_LDPGSZ); 188 epp->ep_dsize = execp->a_data + execp->a_bss; 189 epp->ep_entry = execp->a_entry; 190 191 /* set up command for text segment */ 192 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 193 epp->ep_taddr, epp->ep_vp, sizeof(struct exec), 194 VM_PROT_READ|VM_PROT_EXECUTE); 195 196 /* set up command for data segment */ 197 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 198 epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec), 199 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 200 201 /* set up command for bss segment */ 202 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 203 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 204 if (bsize > 0) 205 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 206 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 207 208 return exec_aout_setup_stack(p, epp); 209 } 210 211 /* 212 * exec_m68k4k_prep_omagic(): Prepare a m68k4k OMAGIC binary's exec package 213 */ 214 215 int 216 exec_m68k4k_prep_omagic(p, epp) 217 struct proc *p; 218 struct exec_package *epp; 219 { 220 struct exec *execp = epp->ep_hdr; 221 long dsize, bsize, baddr; 222 223 epp->ep_taddr = M68K4K_USRTEXT; 224 epp->ep_tsize = execp->a_text; 225 epp->ep_daddr = epp->ep_taddr + execp->a_text; 226 epp->ep_dsize = execp->a_data + execp->a_bss; 227 epp->ep_entry = execp->a_entry; 228 229 /* set up command for text and data segments */ 230 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 231 execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp, 232 sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 233 234 /* set up command for bss segment */ 235 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 236 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 237 if (bsize > 0) 238 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 239 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 240 241 /* 242 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize); 243 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are 244 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize' 245 * respectively to page boundaries. 246 * Compensate `ep_dsize' for the amount of data covered by the last 247 * text page. 248 */ 249 dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, NBPG); 250 epp->ep_dsize = (dsize > 0) ? dsize : 0; 251 return exec_aout_setup_stack(p, epp); 252 } 253
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