Annotation of sys/compat/common/compat_exec.c, Revision 1.1.1.1
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: }
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