1 /* $NetBSD: m68k4k_exec.c,v 1.19 2007/12/08 18:36:13 dsl 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 PAGE_SIZE == 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 1.19 2007/12/08 18:36:13 dsl 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(struct lwp *, struct exec_package *); 61 int exec_m68k4k_prep_nmagic(struct lwp *, struct exec_package *); 62 int exec_m68k4k_prep_omagic(struct lwp *, 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(struct lwp *l, struct exec_package *epp) 79 { 80 u_long midmag, magic; 81 u_short mid; 82 int error; 83 struct exec *execp = epp->ep_hdr; 84 85 /* See note above... */ 86 if (M68K4K_LDPGSZ != PAGE_SIZE) 87 return ENOEXEC; 88 89 if (epp->ep_hdrvalid < sizeof(struct exec)) 90 return ENOEXEC; 91 92 midmag = ntohl(execp->a_midmag); 93 mid = (midmag >> 16) & 0x3ff; 94 magic = midmag & 0xffff; 95 96 midmag = mid << 16 | magic; 97 98 switch (midmag) { 99 case (MID_M68K4K << 16) | ZMAGIC: 100 error = exec_m68k4k_prep_zmagic(l, epp); 101 break; 102 case (MID_M68K4K << 16) | NMAGIC: 103 error = exec_m68k4k_prep_nmagic(l, epp); 104 break; 105 case (MID_M68K4K << 16) | OMAGIC: 106 error = exec_m68k4k_prep_omagic(l, epp); 107 break; 108 default: 109 error = ENOEXEC; 110 } 111 112 if (error) 113 kill_vmcmds(&epp->ep_vmcmds); 114 115 return error; 116 } 117 118 /* 119 * exec_m68k4k_prep_zmagic(): Prepare an m68k4k ZMAGIC binary's exec package 120 * 121 * First, set of the various offsets/lengths in the exec package. 122 * 123 * Then, mark the text image busy (so it can be demand paged) or error 124 * out if this is not possible. Finally, set up vmcmds for the 125 * text, data, bss, and stack segments. 126 */ 127 128 int 129 exec_m68k4k_prep_zmagic(struct lwp *l, struct exec_package *epp) 130 { 131 struct exec *execp = epp->ep_hdr; 132 int error; 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 error = vn_marktext(epp->ep_vp); 141 if (error) 142 return (error); 143 144 /* set up command for text segment */ 145 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text, 146 epp->ep_taddr, epp->ep_vp, 0, VM_PROT_READ|VM_PROT_EXECUTE); 147 148 /* set up command for data segment */ 149 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data, 150 epp->ep_daddr, epp->ep_vp, execp->a_text, 151 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 152 153 /* set up command for bss segment */ 154 if (execp->a_bss) 155 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 156 epp->ep_daddr + execp->a_data, NULLVP, 0, 157 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 158 159 return (*epp->ep_esch->es_setup_stack)(l, epp); 160 } 161 162 /* 163 * exec_m68k4k_prep_nmagic(): Prepare a m68k4k NMAGIC binary's exec package 164 */ 165 166 int 167 exec_m68k4k_prep_nmagic(struct lwp *l, struct exec_package *epp) 168 { 169 struct exec *execp = epp->ep_hdr; 170 long bsize, baddr; 171 172 epp->ep_taddr = M68K4K_USRTEXT; 173 epp->ep_tsize = execp->a_text; 174 epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, 175 M68K4K_LDPGSZ); 176 epp->ep_dsize = execp->a_data + execp->a_bss; 177 epp->ep_entry = execp->a_entry; 178 179 /* set up command for text segment */ 180 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 181 epp->ep_taddr, epp->ep_vp, sizeof(struct exec), 182 VM_PROT_READ|VM_PROT_EXECUTE); 183 184 /* set up command for data segment */ 185 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 186 epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec), 187 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 188 189 /* set up command for bss segment */ 190 baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE); 191 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 192 if (bsize > 0) 193 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 194 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 195 196 return (*epp->ep_esch->es_setup_stack)(l, epp); 197 } 198 199 /* 200 * exec_m68k4k_prep_omagic(): Prepare a m68k4k OMAGIC binary's exec package 201 */ 202 203 int 204 exec_m68k4k_prep_omagic(struct lwp *l, struct exec_package *epp) 205 { 206 struct exec *execp = epp->ep_hdr; 207 long dsize, bsize, baddr; 208 209 epp->ep_taddr = M68K4K_USRTEXT; 210 epp->ep_tsize = execp->a_text; 211 epp->ep_daddr = epp->ep_taddr + execp->a_text; 212 epp->ep_dsize = execp->a_data + execp->a_bss; 213 epp->ep_entry = execp->a_entry; 214 215 /* set up command for text and data segments */ 216 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 217 execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp, 218 sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 219 220 /* set up command for bss segment */ 221 baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE); 222 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 223 if (bsize > 0) 224 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 225 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 226 227 /* 228 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize); 229 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are 230 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize' 231 * respectively to page boundaries. 232 * Compensate `ep_dsize' for the amount of data covered by the last 233 * text page. 234 */ 235 dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, 236 PAGE_SIZE); 237 epp->ep_dsize = (dsize > 0) ? dsize : 0; 238 return (*epp->ep_esch->es_setup_stack)(l, epp); 239 } 240