compat_exec.c revision 1.9
1 /* $NetBSD: compat_exec.c,v 1.9 2003/04/01 01:47:24 thorpej 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 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: compat_exec.c,v 1.9 2003/04/01 01:47:24 thorpej Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/proc.h> 39 #include <sys/malloc.h> 40 #include <sys/vnode.h> 41 #include <sys/exec.h> 42 #include <sys/resourcevar.h> 43 44 /* 45 * exec_aout_prep_oldzmagic(): 46 * Prepare the vmcmds to build a vmspace for an old ZMAGIC 47 * binary. [386BSD/BSDI/4.4BSD/NetBSD0.8] 48 * 49 * Cloned from exec_aout_prep_zmagic() in kern/exec_aout.c; a more verbose 50 * description of operation is there. 51 * There were copies of this in the mac68k, hp300, and i386 ports. 52 */ 53 int 54 exec_aout_prep_oldzmagic(p, epp) 55 struct proc *p; 56 struct exec_package *epp; 57 { 58 struct exec *execp = epp->ep_hdr; 59 int error; 60 61 epp->ep_taddr = 0; 62 epp->ep_tsize = execp->a_text; 63 epp->ep_daddr = epp->ep_taddr + execp->a_text; 64 epp->ep_dsize = execp->a_data + execp->a_bss; 65 epp->ep_entry = execp->a_entry; 66 67 error = vn_marktext(epp->ep_vp); 68 if (error) 69 return (error); 70 71 /* set up command for text segment */ 72 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text, 73 epp->ep_taddr, epp->ep_vp, PAGE_SIZE, /* XXX CLBYTES? */ 74 VM_PROT_READ|VM_PROT_EXECUTE); 75 76 /* set up command for data segment */ 77 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data, 78 epp->ep_daddr, epp->ep_vp, 79 execp->a_text + PAGE_SIZE, /* XXX CLBYTES? */ 80 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 81 82 /* set up command for bss segment */ 83 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 84 epp->ep_daddr + execp->a_data, NULLVP, 0, 85 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 86 87 return exec_aout_setup_stack(p, epp); 88 } 89 90 91 /* 92 * exec_aout_prep_oldnmagic(): 93 * Prepare the vmcmds to build a vmspace for an old NMAGIC 94 * binary. [BSDI] 95 * 96 * Cloned from exec_aout_prep_nmagic() in kern/exec_aout.c; with text starting 97 * at 0. 98 * XXX: There must be a better way to share this code. 99 */ 100 int 101 exec_aout_prep_oldnmagic(p, epp) 102 struct proc *p; 103 struct exec_package *epp; 104 { 105 struct exec *execp = epp->ep_hdr; 106 long bsize, baddr; 107 108 epp->ep_taddr = 0; 109 epp->ep_tsize = execp->a_text; 110 epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, AOUT_LDPGSZ); 111 epp->ep_dsize = execp->a_data + execp->a_bss; 112 epp->ep_entry = execp->a_entry; 113 114 /* set up command for text segment */ 115 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 116 epp->ep_taddr, epp->ep_vp, sizeof(struct exec), 117 VM_PROT_READ|VM_PROT_EXECUTE); 118 119 /* set up command for data segment */ 120 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 121 epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec), 122 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 123 124 /* set up command for bss segment */ 125 baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE); 126 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 127 if (bsize > 0) 128 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 129 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 130 131 return exec_aout_setup_stack(p, epp); 132 } 133 134 135 /* 136 * exec_aout_prep_oldomagic(): 137 * Prepare the vmcmds to build a vmspace for an old OMAGIC 138 * binary. [BSDI] 139 * 140 * Cloned from exec_aout_prep_omagic() in kern/exec_aout.c; with text starting 141 * at 0. 142 * XXX: There must be a better way to share this code. 143 */ 144 int 145 exec_aout_prep_oldomagic(p, epp) 146 struct proc *p; 147 struct exec_package *epp; 148 { 149 struct exec *execp = epp->ep_hdr; 150 long dsize, bsize, baddr; 151 152 epp->ep_taddr = 0; 153 epp->ep_tsize = execp->a_text; 154 epp->ep_daddr = epp->ep_taddr + execp->a_text; 155 epp->ep_dsize = execp->a_data + execp->a_bss; 156 epp->ep_entry = execp->a_entry; 157 158 /* set up command for text and data segments */ 159 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 160 execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp, 161 sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 162 163 /* set up command for bss segment */ 164 baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE); 165 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 166 if (bsize > 0) 167 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 168 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 169 170 /* 171 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize); 172 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are 173 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize' 174 * respectively to page boundaries. 175 * Compensate `ep_dsize' for the amount of data covered by the last 176 * text page. 177 */ 178 dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, 179 PAGE_SIZE); 180 epp->ep_dsize = (dsize > 0) ? dsize : 0; 181 return exec_aout_setup_stack(p, epp); 182 } 183
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