Annotation of sys/compat/common/compat_exec.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: compat_exec.c,v 1.7 2001/11/15 06:22:29 art Exp $ */
! 2: /* $NetBSD: compat_exec.c,v 1.1 1996/05/18 15:52:21 christos Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1993, 1994 Christopher G. Demetriou
! 6: * All rights reserved.
! 7: *
! 8: * Redistribution and use in source and binary forms, with or without
! 9: * modification, are permitted provided that the following conditions
! 10: * are met:
! 11: * 1. Redistributions of source code must retain the above copyright
! 12: * notice, this list of conditions and the following disclaimer.
! 13: * 2. Redistributions in binary form must reproduce the above copyright
! 14: * notice, this list of conditions and the following disclaimer in the
! 15: * documentation and/or other materials provided with the distribution.
! 16: * 3. All advertising materials mentioning features or use of this software
! 17: * must display the following acknowledgement:
! 18: * This product includes software developed by Christopher G. Demetriou.
! 19: * 4. The name of the author may not be used to endorse or promote products
! 20: * derived from this software without specific prior written permission
! 21: *
! 22: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
! 23: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 24: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 25: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
! 26: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
! 27: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
! 28: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
! 29: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 30: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
! 31: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 32: */
! 33:
! 34: #include <sys/param.h>
! 35: #include <sys/systm.h>
! 36: #include <sys/proc.h>
! 37: #include <sys/malloc.h>
! 38: #include <sys/vnode.h>
! 39: #include <sys/exec.h>
! 40: #include <sys/resourcevar.h>
! 41: #include <uvm/uvm_extern.h>
! 42:
! 43: /*
! 44: * exec_aout_prep_oldzmagic():
! 45: * Prepare the vmcmds to build a vmspace for an old ZMAGIC
! 46: * binary. [386BSD/BSDI/4.4BSD/NetBSD0.8]
! 47: *
! 48: * Cloned from exec_aout_prep_zmagic() in kern/exec_aout.c; a more verbose
! 49: * description of operation is there.
! 50: * There were copies of this in the mac68k, hp300, and i386 ports.
! 51: */
! 52: int
! 53: exec_aout_prep_oldzmagic(p, epp)
! 54: struct proc *p;
! 55: struct exec_package *epp;
! 56: {
! 57: struct exec *execp = epp->ep_hdr;
! 58:
! 59: epp->ep_taddr = 0;
! 60: epp->ep_tsize = execp->a_text;
! 61: epp->ep_daddr = epp->ep_taddr + execp->a_text;
! 62: epp->ep_dsize = execp->a_data + execp->a_bss;
! 63: epp->ep_entry = execp->a_entry;
! 64:
! 65: /*
! 66: * check if vnode is in open for writing, because we want to
! 67: * demand-page out of it. if it is, don't do it, for various
! 68: * reasons
! 69: */
! 70: if ((execp->a_text != 0 || execp->a_data != 0) &&
! 71: epp->ep_vp->v_writecount != 0) {
! 72: #ifdef DIAGNOSTIC
! 73: if (epp->ep_vp->v_flag & VTEXT)
! 74: panic("exec: a VTEXT vnode has writecount != 0");
! 75: #endif
! 76: return ETXTBSY;
! 77: }
! 78: vn_marktext(epp->ep_vp);
! 79:
! 80: /* set up command for text segment */
! 81: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text,
! 82: epp->ep_taddr, epp->ep_vp, PAGE_SIZE,
! 83: VM_PROT_READ|VM_PROT_EXECUTE);
! 84:
! 85: /* set up command for data segment */
! 86: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data,
! 87: epp->ep_daddr, epp->ep_vp,
! 88: execp->a_text + PAGE_SIZE,
! 89: VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
! 90:
! 91: /* set up command for bss segment */
! 92: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
! 93: epp->ep_daddr + execp->a_data, NULLVP, 0,
! 94: VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
! 95:
! 96: return exec_setup_stack(p, epp);
! 97: }
! 98:
! 99:
! 100: /*
! 101: * exec_aout_prep_oldnmagic():
! 102: * Prepare the vmcmds to build a vmspace for an old NMAGIC
! 103: * binary. [BSDI]
! 104: *
! 105: * Cloned from exec_aout_prep_nmagic() in kern/exec_aout.c; with text starting
! 106: * at 0.
! 107: * XXX: There must be a better way to share this code.
! 108: */
! 109: int
! 110: exec_aout_prep_oldnmagic(p, epp)
! 111: struct proc *p;
! 112: struct exec_package *epp;
! 113: {
! 114: struct exec *execp = epp->ep_hdr;
! 115: long bsize, baddr;
! 116:
! 117: epp->ep_taddr = 0;
! 118: epp->ep_tsize = execp->a_text;
! 119: epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, __LDPGSZ);
! 120: epp->ep_dsize = execp->a_data + execp->a_bss;
! 121: epp->ep_entry = execp->a_entry;
! 122:
! 123: /* set up command for text segment */
! 124: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
! 125: epp->ep_taddr, epp->ep_vp, sizeof(struct exec),
! 126: VM_PROT_READ|VM_PROT_EXECUTE);
! 127:
! 128: /* set up command for data segment */
! 129: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
! 130: epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec),
! 131: VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
! 132:
! 133: /* set up command for bss segment */
! 134: baddr = round_page(epp->ep_daddr + execp->a_data);
! 135: bsize = epp->ep_daddr + epp->ep_dsize - baddr;
! 136: if (bsize > 0)
! 137: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
! 138: NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
! 139:
! 140: return exec_setup_stack(p, epp);
! 141: }
! 142:
! 143:
! 144: /*
! 145: * exec_aout_prep_oldomagic():
! 146: * Prepare the vmcmds to build a vmspace for an old OMAGIC
! 147: * binary. [BSDI]
! 148: *
! 149: * Cloned from exec_aout_prep_omagic() in kern/exec_aout.c; with text starting
! 150: * at 0.
! 151: * XXX: There must be a better way to share this code.
! 152: */
! 153: int
! 154: exec_aout_prep_oldomagic(p, epp)
! 155: struct proc *p;
! 156: struct exec_package *epp;
! 157: {
! 158: struct exec *execp = epp->ep_hdr;
! 159: long dsize, bsize, baddr;
! 160:
! 161: epp->ep_taddr = 0;
! 162: epp->ep_tsize = execp->a_text;
! 163: epp->ep_daddr = epp->ep_taddr + execp->a_text;
! 164: epp->ep_dsize = execp->a_data + execp->a_bss;
! 165: epp->ep_entry = execp->a_entry;
! 166:
! 167: /* set up command for text and data segments */
! 168: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
! 169: execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp,
! 170: sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
! 171:
! 172: /* set up command for bss segment */
! 173: baddr = round_page(epp->ep_daddr + execp->a_data);
! 174: bsize = epp->ep_daddr + epp->ep_dsize - baddr;
! 175: if (bsize > 0)
! 176: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
! 177: NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
! 178:
! 179: /*
! 180: * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize);
! 181: * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are
! 182: * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize'
! 183: * respectively to page boundaries.
! 184: * Compensate `ep_dsize' for the amount of data covered by the last
! 185: * text page.
! 186: */
! 187: dsize = epp->ep_dsize + execp->a_text - round_page(execp->a_text);
! 188: epp->ep_dsize = (dsize > 0) ? dsize : 0;
! 189: return exec_setup_stack(p, epp);
! 190: }
CVSweb
![[BACK]](/icons/back.gif){kind=icon}
Return to compat_exec.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / sys / compat / common