exec_subr.c revision 1.14
1 /* $NetBSD: exec_subr.c,v 1.14 1998/07/28 18:11:39 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1993, 1994, 1996 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 #include "opt_uvm.h" 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/proc.h> 38 #include <sys/malloc.h> 39 #include <sys/vnode.h> 40 #include <sys/filedesc.h> 41 #include <sys/exec.h> 42 #include <sys/mman.h> 43 44 #include <vm/vm.h> 45 46 #if defined(UVM) 47 #include <uvm/uvm.h> 48 #endif 49 50 /* 51 * XXX cgd 960926: this module should collect simple statistics 52 * (calls, extends, kills). 53 */ 54 55 #ifdef DEBUG 56 /* 57 * new_vmcmd(): 58 * create a new vmcmd structure and fill in its fields based 59 * on function call arguments. make sure objects ref'd by 60 * the vmcmd are 'held'. 61 * 62 * If not debugging, this is a macro, so it's expanded inline. 63 */ 64 65 void 66 new_vmcmd(evsp, proc, len, addr, vp, offset, prot) 67 struct exec_vmcmd_set *evsp; 68 int (*proc) __P((struct proc * p, struct exec_vmcmd *)); 69 u_long len; 70 u_long addr; 71 struct vnode *vp; 72 u_long offset; 73 u_int prot; 74 { 75 struct exec_vmcmd *vcp; 76 77 if (evsp->evs_used >= evsp->evs_cnt) 78 vmcmdset_extend(evsp); 79 vcp = &evsp->evs_cmds[evsp->evs_used++]; 80 vcp->ev_proc = proc; 81 vcp->ev_len = len; 82 vcp->ev_addr = addr; 83 if ((vcp->ev_vp = vp) != NULL) 84 vref(vp); 85 vcp->ev_offset = offset; 86 vcp->ev_prot = prot; 87 } 88 #endif /* DEBUG */ 89 90 void 91 vmcmdset_extend(evsp) 92 struct exec_vmcmd_set *evsp; 93 { 94 struct exec_vmcmd *nvcp; 95 u_int ocnt; 96 97 #ifdef DIAGNOSTIC 98 if (evsp->evs_used < evsp->evs_cnt) 99 panic("vmcmdset_extend: not necessary"); 100 #endif 101 102 /* figure out number of entries in new set */ 103 ocnt = evsp->evs_cnt; 104 evsp->evs_cnt += ocnt ? ocnt : EXEC_DEFAULT_VMCMD_SETSIZE; 105 106 /* allocate it */ 107 MALLOC(nvcp, struct exec_vmcmd *, 108 (evsp->evs_cnt * sizeof(struct exec_vmcmd)), M_EXEC, M_WAITOK); 109 110 /* free the old struct, if there was one, and record the new one */ 111 if (ocnt) { 112 bcopy(evsp->evs_cmds, nvcp, (ocnt * sizeof(struct exec_vmcmd))); 113 FREE(evsp->evs_cmds, M_EXEC); 114 } 115 evsp->evs_cmds = nvcp; 116 } 117 118 void 119 kill_vmcmds(evsp) 120 struct exec_vmcmd_set *evsp; 121 { 122 struct exec_vmcmd *vcp; 123 int i; 124 125 if (evsp->evs_cnt == 0) 126 return; 127 128 for (i = 0; i < evsp->evs_used; i++) { 129 vcp = &evsp->evs_cmds[i]; 130 if (vcp->ev_vp != NULLVP) 131 vrele(vcp->ev_vp); 132 } 133 evsp->evs_used = evsp->evs_cnt = 0; 134 FREE(evsp->evs_cmds, M_EXEC); 135 } 136 137 /* 138 * vmcmd_map_pagedvn(): 139 * handle vmcmd which specifies that a vnode should be mmap'd. 140 * appropriate for handling demand-paged text and data segments. 141 */ 142 143 int 144 vmcmd_map_pagedvn(p, cmd) 145 struct proc *p; 146 struct exec_vmcmd *cmd; 147 { 148 /* 149 * note that if you're going to map part of an process as being 150 * paged from a vnode, that vnode had damn well better be marked as 151 * VTEXT. that's handled in the routine which sets up the vmcmd to 152 * call this routine. 153 */ 154 #if defined(UVM) 155 struct uvm_object *uobj; 156 int retval; 157 158 /* 159 * map the vnode in using uvm_map. 160 */ 161 162 /* checks imported from uvm_mmap, needed? */ 163 if (cmd->ev_len == 0) 164 return(0); 165 if (cmd->ev_offset & PAGE_MASK) 166 return(EINVAL); 167 if (cmd->ev_addr & PAGE_MASK) 168 return(EINVAL); 169 170 /* 171 * first, attach to the object 172 */ 173 174 uobj = uvn_attach((void *) cmd->ev_vp, VM_PROT_READ|VM_PROT_EXECUTE); 175 if (uobj == NULL) 176 return(ENOMEM); 177 178 /* 179 * do the map 180 */ 181 182 retval = uvm_map(&p->p_vmspace->vm_map, &cmd->ev_addr, cmd->ev_len, 183 uobj, cmd->ev_offset, 184 UVM_MAPFLAG(cmd->ev_prot, VM_PROT_ALL, UVM_INH_COPY, 185 UVM_ADV_NORMAL, UVM_FLAG_COPYONW|UVM_FLAG_FIXED)); 186 187 /* 188 * check for error 189 */ 190 191 if (retval == KERN_SUCCESS) 192 return(0); 193 194 /* 195 * error: detach from object 196 */ 197 198 uobj->pgops->pgo_detach(uobj); 199 return(EINVAL); 200 201 #else 202 return vm_mmap(&p->p_vmspace->vm_map, &cmd->ev_addr, cmd->ev_len, 203 cmd->ev_prot, VM_PROT_ALL, MAP_FIXED|MAP_COPY, (caddr_t)cmd->ev_vp, 204 cmd->ev_offset); 205 #endif 206 } 207 208 /* 209 * vmcmd_map_readvn(): 210 * handle vmcmd which specifies that a vnode should be read from. 211 * appropriate for non-demand-paged text/data segments, i.e. impure 212 * objects (a la OMAGIC and NMAGIC). 213 */ 214 int 215 vmcmd_map_readvn(p, cmd) 216 struct proc *p; 217 struct exec_vmcmd *cmd; 218 { 219 int error; 220 221 #if defined(UVM) 222 if (cmd->ev_len == 0) 223 return(KERN_SUCCESS); /* XXXCDC: should it happen? */ 224 225 cmd->ev_addr = trunc_page(cmd->ev_addr); /* required by uvm_map */ 226 error = uvm_map(&p->p_vmspace->vm_map, &cmd->ev_addr, 227 round_page(cmd->ev_len), NULL, UVM_UNKNOWN_OFFSET, 228 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 229 UVM_ADV_NORMAL, 230 UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)); 231 232 #else 233 error = vm_allocate(&p->p_vmspace->vm_map, &cmd->ev_addr, 234 cmd->ev_len, 0); 235 #endif 236 if (error) 237 return error; 238 239 error = vn_rdwr(UIO_READ, cmd->ev_vp, (caddr_t)cmd->ev_addr, 240 cmd->ev_len, cmd->ev_offset, UIO_USERSPACE, IO_UNIT, 241 p->p_ucred, NULL, p); 242 if (error) 243 return error; 244 245 #if defined(UVM) 246 if (cmd->ev_prot != (VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE)) { 247 /* 248 * we had to map in the area at PROT_ALL so that vn_rdwr() 249 * could write to it. however, the caller seems to want 250 * it mapped read-only, so now we are going to have to call 251 * uvm_map_protect() to fix up the protection. ICK. 252 */ 253 return(uvm_map_protect(&p->p_vmspace->vm_map, 254 trunc_page(cmd->ev_addr), 255 round_page(cmd->ev_addr + cmd->ev_len), 256 cmd->ev_prot, FALSE)); 257 } else { 258 return(KERN_SUCCESS); 259 } 260 #else 261 return vm_map_protect(&p->p_vmspace->vm_map, trunc_page(cmd->ev_addr), 262 round_page(cmd->ev_addr + cmd->ev_len), cmd->ev_prot, FALSE); 263 #endif 264 } 265 266 /* 267 * vmcmd_map_zero(): 268 * handle vmcmd which specifies a zero-filled address space region. The 269 * address range must be first allocated, then protected appropriately. 270 */ 271 272 int 273 vmcmd_map_zero(p, cmd) 274 struct proc *p; 275 struct exec_vmcmd *cmd; 276 { 277 int error; 278 279 #if defined(UVM) 280 if (cmd->ev_len == 0) 281 return(KERN_SUCCESS); /* XXXCDC: should it happen? */ 282 283 cmd->ev_addr = trunc_page(cmd->ev_addr); /* required by uvm_map */ 284 error = uvm_map(&p->p_vmspace->vm_map, &cmd->ev_addr, 285 round_page(cmd->ev_len), NULL, UVM_UNKNOWN_OFFSET, 286 UVM_MAPFLAG(cmd->ev_prot, UVM_PROT_ALL, UVM_INH_COPY, 287 UVM_ADV_NORMAL, 288 UVM_FLAG_FIXED|UVM_FLAG_COPYONW)); 289 290 #else 291 error = vm_allocate(&p->p_vmspace->vm_map, &cmd->ev_addr, 292 cmd->ev_len, 0); 293 #endif 294 if (error) 295 return error; 296 297 #if !defined(UVM) 298 if (cmd->ev_prot != VM_PROT_DEFAULT) 299 return vm_map_protect(&p->p_vmspace->vm_map, 300 trunc_page(cmd->ev_addr), 301 round_page(cmd->ev_addr + cmd->ev_len), 302 cmd->ev_prot, FALSE); 303 #endif 304 return(KERN_SUCCESS); 305 } 306
Indexes created Tue Sep 23 22:09:46 GMT 2025