Annotation of sys/compat/m68k4k/m68k4k_exec.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: m68k4k_exec.c,v 1.6 2002/03/14 01:26:50 millert Exp $ */
2: /* $NetBSD: m68k4k_exec.c,v 1.1 1996/09/10 22:01:20 thorpej 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: /*
35: * Exec glue to provide compatibility with older {Net,Open}BSD m68k4k
36: * exectuables.
37: *
38: * Taken directly from kern/exec_aout.c and frobbed to map text and
39: * data as m68k4k executables expect.
40: *
41: * This module only works on machines with PAGE_SIZE == 4096. It's not clear
42: * that making it work on other machines is worth the trouble.
43: */
44:
45: #if !defined(__m68k__)
46: #error YOU GOTTA BE KIDDING!
47: #endif
48:
49: #include <sys/param.h>
50: #include <sys/systm.h>
51: #include <sys/proc.h>
52: #include <sys/malloc.h>
53: #include <sys/vnode.h>
54: #include <sys/exec.h>
55: #include <sys/resourcevar.h>
56:
57: #include <uvm/uvm_extern.h>
58:
59: #include <compat/m68k4k/m68k4k_exec.h>
60:
61: int exec_m68k4k_prep_zmagic(struct proc *, struct exec_package *);
62: int exec_m68k4k_prep_nmagic(struct proc *, struct exec_package *);
63: int exec_m68k4k_prep_omagic(struct proc *, struct exec_package *);
64:
65: /*
66: * exec_m68k4k_makecmds(): Check if it's an a.out-format executable
67: * with an m68k4k magic number.
68: *
69: * Given a proc pointer and an exec package pointer, see if the referent
70: * of the epp is in a.out format. Just check 'standard' magic numbers for
71: * this architecture.
72: *
73: * This function, in the former case, or the hook, in the latter, is
74: * responsible for creating a set of vmcmds which can be used to build
75: * the process's vm space and inserting them into the exec package.
76: */
77:
78: int
79: exec_m68k4k_makecmds(p, epp)
80: struct proc *p;
81: struct exec_package *epp;
82: {
83: u_long midmag, magic;
84: u_short mid;
85: int error;
86: struct exec *execp = epp->ep_hdr;
87:
88: /* See note above... */
89: if (M68K4K_LDPGSZ != PAGE_SIZE)
90: return ENOEXEC;
91:
92: if (epp->ep_hdrvalid < sizeof(struct exec))
93: return ENOEXEC;
94:
95: midmag = ntohl(execp->a_midmag);
96: mid = (midmag >> 16) & 0x3ff;
97: magic = midmag & 0xffff;
98:
99: midmag = mid << 16 | magic;
100:
101: switch (midmag) {
102: case (MID_M68K4K << 16) | ZMAGIC:
103: error = exec_m68k4k_prep_zmagic(p, epp);
104: break;
105: case (MID_M68K4K << 16) | NMAGIC:
106: error = exec_m68k4k_prep_nmagic(p, epp);
107: break;
108: case (MID_M68K4K << 16) | OMAGIC:
109: error = exec_m68k4k_prep_omagic(p, epp);
110: break;
111: default:
112: error = ENOEXEC;
113: }
114:
115: if (error)
116: kill_vmcmds(&epp->ep_vmcmds);
117:
118: return error;
119: }
120:
121: /*
122: * exec_m68k4k_prep_zmagic(): Prepare an m68k4k ZMAGIC binary's exec package
123: *
124: * First, set of the various offsets/lengths in the exec package.
125: *
126: * Then, mark the text image busy (so it can be demand paged) or error
127: * out if this is not possible. Finally, set up vmcmds for the
128: * text, data, bss, and stack segments.
129: */
130:
131: int
132: exec_m68k4k_prep_zmagic(p, epp)
133: struct proc *p;
134: struct exec_package *epp;
135: {
136: struct exec *execp = epp->ep_hdr;
137:
138: epp->ep_taddr = M68K4K_USRTEXT;
139: epp->ep_tsize = execp->a_text;
140: epp->ep_daddr = epp->ep_taddr + execp->a_text;
141: epp->ep_dsize = execp->a_data + execp->a_bss;
142: epp->ep_entry = execp->a_entry;
143:
144: /*
145: * check if vnode is in open for writing, because we want to
146: * demand-page out of it. if it is, don't do it, for various
147: * reasons
148: */
149: if ((execp->a_text != 0 || execp->a_data != 0) &&
150: epp->ep_vp->v_writecount != 0) {
151: #ifdef DIAGNOSTIC
152: if (epp->ep_vp->v_flag & VTEXT)
153: panic("exec: a VTEXT vnode has writecount != 0");
154: #endif
155: return ETXTBSY;
156: }
157: vn_marktext(epp->ep_vp);
158:
159: /* set up command for text segment */
160: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text,
161: epp->ep_taddr, epp->ep_vp, 0, VM_PROT_READ|VM_PROT_EXECUTE);
162:
163: /* set up command for data segment */
164: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data,
165: epp->ep_daddr, epp->ep_vp, execp->a_text,
166: VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
167:
168: /* set up command for bss segment */
169: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
170: epp->ep_daddr + execp->a_data, NULLVP, 0,
171: VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
172:
173: return exec_setup_stack(p, epp);
174: }
175:
176: /*
177: * exec_m68k4k_prep_nmagic(): Prepare a m68k4k NMAGIC binary's exec package
178: */
179:
180: int
181: exec_m68k4k_prep_nmagic(p, epp)
182: struct proc *p;
183: struct exec_package *epp;
184: {
185: struct exec *execp = epp->ep_hdr;
186: long bsize, baddr;
187:
188: epp->ep_taddr = M68K4K_USRTEXT;
189: epp->ep_tsize = execp->a_text;
190: epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text,
191: M68K4K_LDPGSZ);
192: epp->ep_dsize = execp->a_data + execp->a_bss;
193: epp->ep_entry = execp->a_entry;
194:
195: /* set up command for text segment */
196: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
197: epp->ep_taddr, epp->ep_vp, sizeof(struct exec),
198: VM_PROT_READ|VM_PROT_EXECUTE);
199:
200: /* set up command for data segment */
201: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
202: epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec),
203: VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
204:
205: /* set up command for bss segment */
206: baddr = round_page(epp->ep_daddr + execp->a_data);
207: bsize = epp->ep_daddr + epp->ep_dsize - baddr;
208: if (bsize > 0)
209: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
210: NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
211:
212: return exec_setup_stack(p, epp);
213: }
214:
215: /*
216: * exec_m68k4k_prep_omagic(): Prepare a m68k4k OMAGIC binary's exec package
217: */
218:
219: int
220: exec_m68k4k_prep_omagic(p, epp)
221: struct proc *p;
222: struct exec_package *epp;
223: {
224: struct exec *execp = epp->ep_hdr;
225: long dsize, bsize, baddr;
226:
227: epp->ep_taddr = M68K4K_USRTEXT;
228: epp->ep_tsize = execp->a_text;
229: epp->ep_daddr = epp->ep_taddr + execp->a_text;
230: epp->ep_dsize = execp->a_data + execp->a_bss;
231: epp->ep_entry = execp->a_entry;
232:
233: /* set up command for text and data segments */
234: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
235: execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp,
236: sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
237:
238: /* set up command for bss segment */
239: baddr = round_page(epp->ep_daddr + execp->a_data);
240: bsize = epp->ep_daddr + epp->ep_dsize - baddr;
241: if (bsize > 0)
242: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
243: NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
244:
245: /*
246: * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize);
247: * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are
248: * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize'
249: * respectively to page boundaries.
250: * Compensate `ep_dsize' for the amount of data covered by the last
251: * text page.
252: */
253: dsize = epp->ep_dsize + execp->a_text - round_page(execp->a_text);
254: epp->ep_dsize = (dsize > 0) ? dsize : 0;
255: return exec_setup_stack(p, epp);
256: }
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