1 /* $NetBSD: m68k4k_exec.c,v 1.25 2019/11/20 19:37:53 pgoyette 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 1.25 2019/11/20 19:37:53 pgoyette 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/module.h> 55 #include <sys/vnode.h> 56 #include <sys/exec.h> 57 #include <sys/exec_aout.h> 58 #include <sys/resourcevar.h> 59 60 #include <compat/m68k4k/m68k4k_exec.h> 61 62 MODULE(MODULE_CLASS_EXEC, exec_m68k4k, NULL); 63 64 static struct execsw exec_m68k4k_execsw = { 65 .es_hdrsz = sizeof(struct exec), 66 .es_makecmds = exec_m68k4k_makecmds, 67 .u = { 68 .elf_probe_func = NULL, 69 }, 70 .es_emul = &emul_netbsd, 71 .es_prio = EXECSW_PRIO_ANY, 72 .es_arglen = 0, 73 .es_copyargs = copyargs, 74 .es_setregs = NULL, 75 .es_coredump = coredump_netbsd, 76 .es_setup_stack = exec_setup_stack, 77 }; 78 79 static int 80 exec_m68k4k_modcmd(modcmd_t cmd, void *arg) 81 { 82 83 switch (cmd) { 84 case MODULE_CMD_INIT: 85 return exec_add(&exec_m68k4k_execsw, 1); 86 87 case MODULE_CMD_FINI: 88 return exec_remove(&exec_m68k4k_execsw, 1); 89 90 default: 91 return ENOTTY; 92 } 93 } 94 95 int exec_m68k4k_prep_zmagic(struct lwp *, struct exec_package *); 96 int exec_m68k4k_prep_nmagic(struct lwp *, struct exec_package *); 97 int exec_m68k4k_prep_omagic(struct lwp *, struct exec_package *); 98 99 /* 100 * exec_m68k4k_makecmds(): Check if it's an a.out-format executable 101 * with an m68k4k magic number. 102 * 103 * Given a proc pointer and an exec package pointer, see if the referent 104 * of the epp is in a.out format. Just check 'standard' magic numbers for 105 * this architecture. 106 * 107 * This function, in the former case, or the hook, in the latter, is 108 * responsible for creating a set of vmcmds which can be used to build 109 * the process's vm space and inserting them into the exec package. 110 */ 111 112 int 113 exec_m68k4k_makecmds(struct lwp *l, struct exec_package *epp) 114 { 115 u_long midmag, magic; 116 u_short mid; 117 int error; 118 struct exec *execp = epp->ep_hdr; 119 120 /* See note above... */ 121 if (M68K4K_LDPGSZ != PAGE_SIZE) 122 return ENOEXEC; 123 124 if (epp->ep_hdrvalid < sizeof(struct exec)) 125 return ENOEXEC; 126 127 midmag = ntohl(execp->a_midmag); 128 mid = (midmag >> 16) & 0x3ff; 129 magic = midmag & 0xffff; 130 131 midmag = mid << 16 | magic; 132 133 switch (midmag) { 134 case (MID_M68K4K << 16) | ZMAGIC: 135 error = exec_m68k4k_prep_zmagic(l, epp); 136 break; 137 case (MID_M68K4K << 16) | NMAGIC: 138 error = exec_m68k4k_prep_nmagic(l, epp); 139 break; 140 case (MID_M68K4K << 16) | OMAGIC: 141 error = exec_m68k4k_prep_omagic(l, epp); 142 break; 143 default: 144 error = ENOEXEC; 145 } 146 147 if (error) 148 kill_vmcmds(&epp->ep_vmcmds); 149 150 return error; 151 } 152 153 /* 154 * exec_m68k4k_prep_zmagic(): Prepare an m68k4k ZMAGIC binary's exec package 155 * 156 * First, set of the various offsets/lengths in the exec package. 157 * 158 * Then, mark the text image busy (so it can be demand paged) or error 159 * out if this is not possible. Finally, set up vmcmds for the 160 * text, data, bss, and stack segments. 161 */ 162 163 int 164 exec_m68k4k_prep_zmagic(struct lwp *l, struct exec_package *epp) 165 { 166 struct exec *execp = epp->ep_hdr; 167 int error; 168 169 epp->ep_taddr = M68K4K_USRTEXT; 170 epp->ep_tsize = execp->a_text; 171 epp->ep_daddr = epp->ep_taddr + execp->a_text; 172 epp->ep_dsize = execp->a_data + execp->a_bss; 173 epp->ep_entry = execp->a_entry; 174 175 error = vn_marktext(epp->ep_vp); 176 if (error) 177 return (error); 178 179 /* set up command for text segment */ 180 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text, 181 epp->ep_taddr, epp->ep_vp, 0, VM_PROT_READ|VM_PROT_EXECUTE); 182 183 /* set up command for data segment */ 184 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data, 185 epp->ep_daddr, epp->ep_vp, execp->a_text, 186 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 187 188 /* set up command for bss segment */ 189 if (execp->a_bss) 190 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 191 epp->ep_daddr + execp->a_data, NULLVP, 0, 192 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 193 194 return (*epp->ep_esch->es_setup_stack)(l, epp); 195 } 196 197 /* 198 * exec_m68k4k_prep_nmagic(): Prepare a m68k4k NMAGIC binary's exec package 199 */ 200 201 int 202 exec_m68k4k_prep_nmagic(struct lwp *l, struct exec_package *epp) 203 { 204 struct exec *execp = epp->ep_hdr; 205 long bsize, baddr; 206 207 epp->ep_taddr = M68K4K_USRTEXT; 208 epp->ep_tsize = execp->a_text; 209 epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, 210 M68K4K_LDPGSZ); 211 epp->ep_dsize = execp->a_data + execp->a_bss; 212 epp->ep_entry = execp->a_entry; 213 214 /* set up command for text segment */ 215 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 216 epp->ep_taddr, epp->ep_vp, sizeof(struct exec), 217 VM_PROT_READ|VM_PROT_EXECUTE); 218 219 /* set up command for data segment */ 220 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 221 epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec), 222 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 223 224 /* set up command for bss segment */ 225 baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE); 226 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 227 if (bsize > 0) 228 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 229 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 230 231 return (*epp->ep_esch->es_setup_stack)(l, epp); 232 } 233 234 /* 235 * exec_m68k4k_prep_omagic(): Prepare a m68k4k OMAGIC binary's exec package 236 */ 237 238 int 239 exec_m68k4k_prep_omagic(struct lwp *l, struct exec_package *epp) 240 { 241 struct exec *execp = epp->ep_hdr; 242 long dsize, bsize, baddr; 243 244 epp->ep_taddr = M68K4K_USRTEXT; 245 epp->ep_tsize = execp->a_text; 246 epp->ep_daddr = epp->ep_taddr + execp->a_text; 247 epp->ep_dsize = execp->a_data + execp->a_bss; 248 epp->ep_entry = execp->a_entry; 249 250 /* set up command for text and data segments */ 251 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 252 execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp, 253 sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 254 255 /* set up command for bss segment */ 256 baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE); 257 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 258 if (bsize > 0) 259 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 260 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 261 262 /* 263 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize); 264 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are 265 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize' 266 * respectively to page boundaries. 267 * Compensate `ep_dsize' for the amount of data covered by the last 268 * text page. 269 */ 270 dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, 271 PAGE_SIZE); 272 epp->ep_dsize = (dsize > 0) ? dsize : 0; 273 return (*epp->ep_esch->es_setup_stack)(l, epp); 274 } 275
Indexes created Sat Sep 20 22:09:52 GMT 2025