Mercurial > hg > xemacs-beta

comparison dynodump/ppc/_relocate.c @ 0:376386a54a3c r19-14

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Import from CVS: tag r19-14
author cvs
date Mon, 13 Aug 2007 08:45:50 +0200
parents
children 131b0175ea99
comparison
equal deleted inserted replaced
-1:000000000000 0:376386a54a3c
1 /*
2 * Copyright (c) 1995 by Sun Microsystems, Inc.
3 * All rights reserved.
4 *
5 * This source code is a product of Sun Microsystems, Inc. and is provided
6 * for unrestricted use provided that this legend is included on all tape
7 * media and as a part of the software program in whole or part. Users
8 * may copy or modify this source code without charge, but are not authorized
9 * to license or distribute it to anyone else except as part of a product or
10 * program developed by the user.
11 *
12 * THIS PROGRAM CONTAINS SOURCE CODE COPYRIGHTED BY SUN MICROSYSTEMS, INC.
13 * SUN MICROSYSTEMS, INC., MAKES NO REPRESENTATIONS ABOUT THE SUITABLITY
14 * OF SUCH SOURCE CODE FOR ANY PURPOSE. IT IS PROVIDED "AS IS" WITHOUT
15 * EXPRESS OR IMPLIED WARRANTY OF ANY KIND. SUN MICROSYSTEMS, INC. DISCLAIMS
16 * ALL WARRANTIES WITH REGARD TO SUCH SOURCE CODE, INCLUDING ALL IMPLIED
17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN
18 * NO EVENT SHALL SUN MICROSYSTEMS, INC. BE LIABLE FOR ANY SPECIAL, INDIRECT,
19 * INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
20 * FROM USE OF SUCH SOURCE CODE, REGARDLESS OF THE THEORY OF LIABILITY.
21 *
22 * This source code is provided with no support and without any obligation on
23 * the part of Sun Microsystems, Inc. to assist in its use, correction,
24 * modification or enhancement.
25 *
26 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
27 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY THIS
28 * SOURCE CODE OR ANY PART THEREOF.
29 *
30 * Sun Microsystems, Inc.
31 * 2550 Garcia Avenue
32 * Mountain View, California 94043
33 */
34
35 #pragma ident "@(#) $Id: _relocate.c,v 1.1.1.1 1996/12/18 03:37:22 steve Exp $ - SMI"
36
37 /* LINTLIBRARY */
38
39 #include <string.h>
40 #include <sys/elf_ppc.h>
41 #include "_dynodump.h"
42
43
44 /*
45 * NOTE: These macros will work reliably only on 32-bit 2's
46 * complement machines. The type of P in all cases should
47 * by unsigned char *
48 */
49 #if defined(_BIG_ENDIAN)
50
51 #define GET4(P) ((long)(((unsigned long)(P)[0] << 24) | \
52 ((unsigned long)(P)[1] << 16) | \
53 ((unsigned long)(P)[2] << 8) | \
54 (unsigned long)(P)[3]))
55 #define PUT4(V, P) { \
56 (P)[0] = (unsigned char)((V) >> 24); \
57 (P)[1] = (unsigned char)((V) >> 16); \
58 (P)[2] = (unsigned char)((V) >> 8); \
59 (P)[3] = (unsigned char)(V); \
60 }
61 #define GEThalf(P) ((long) (((unsigned long) (P)[0] << 8) | \
62 ((unsigned long) (P)[1])))
63 #define GETword(P) GET4(P)
64 #define PUThalf(V, P) { \
65 (P)[0] = ((V) >> 8); \
66 (P)[1] = ((V)); \
67 }
68 #define PUTword(V, P) PUT4(V, P)
69
70 #elif defined(_LITTLE_ENDIAN)
71
72 #define GET4(P) ((long)(((unsigned long)(P)[0]) | \
73 ((unsigned long)(P)[1] << 8) | \
74 ((unsigned long)(P)[2] << 16) | \
75 ((unsigned long)(P)[3]) << 24))
76 #define PUT4(V, P) { \
77 (P)[0] = (unsigned char)(V); \
78 (P)[1] = (unsigned char)((V) >> 8); \
79 (P)[2] = (unsigned char)((V) >> 16); \
80 (P)[3] = (unsigned char)((V) >> 24); \
81 }
82 #define GEThalf(P) ((long) (((unsigned long) (P)[0]) | \
83 ((unsigned long) (P)[1] << 8)))
84 #define GETword(P) GET4(P)
85 #define PUThalf(V, P) { \
86 (P)[0] = (V); \
87 (P)[1] = ((V) >> 8); \
88 }
89 #define PUTword(V, P) PUT4(V, P)
90
91 #endif /* defined(_LITTLE_ENDIAN) */
92
93 /*
94 * NAME VALUE FIELD CALCULATION
95 *
96 * R_PPC_NONE 0 none none
97 * R_PPC_ADDR32 1 word32 S + A
98 * R_PPC_ADDR24 2 low24 (S + A) >> 2
99 * R_PPC_ADDR16 3 half16 S + A
100 * R_PPC_ADDR16_LO 4 half16 #lo(S + A)
101 * R_PPC_ADDR16_HI 5 half16 #hi(S + A)
102 * R_PPC_ADDR16_HA 6 half16 #ha(S + A)
103 * R_PPC_ADDR14 7 low14 (S + A) >> 2
104 * R_PPC_ADDR14_BRTAKEN 8 low14 (S + A) >> 2
105 * R_PPC_ADDR14_BRNTAKEN 9 low14 (S + A) >> 2
106 * R_PPC_REL24 10 low24 (S + A - P) >> 2
107 * R_PPC_REL14 11 low14 (S + A - P) >> 2
108 * R_PPC_REL14_BRTAKEN 12 low14 (S + A - P) >> 2
109 * R_PPC_REL14_BRNTAKEN 13 low14 (S + A - P) >> 2
110 * R_PPC_GOT16 14 half16 G + A
111 * R_PPC_GOT16_LO 15 half16 #lo(G + A)
112 * R_PPC_GOT16_HI 16 half16 #hi(G + A)
113 * R_PPC_GOT16_HA 17 half16 #ha(G + A)
114 * R_PPC_PLT24 18 low24 (L + A - P) >> 2
115 * R_PPC_COPY 19 none none
116 * R_PPC_GLOB_DAT 20 word32 S + A
117 * R_PPC_JMP_SLOT 21 none see below
118 * R_PPC_RELATIVE 22 word32 B + A
119 * R_PPC_LOCAL24PC 23 low24 see below
120 * R_PPC_UADDR32 24 word32 S + A
121 * R_PPC_UADDR16 25 half16 S + A
122 *
123 * This is Figure 4-3: Relocation Types from the Draft Copy of
124 * the ABI, Printed on 7/25/94.
125 *
126 * The field column specifies how much of the data
127 * at the reference address is to be used. The data are assumed to be
128 * right-justified with the least significant bit at the right.
129 * In the case of plt24 addresses, the reference address is
130 * assumed to be that of a 6-word PLT entry. The address is the right-
131 * most 24 bits of the third word.
132 */
133 static void
134 move_reloc(unsigned char *iaddr, unsigned char *oaddr, unsigned char type)
135 {
136 switch(type) {
137 case R_PPC_NONE:
138 break;
139
140 case R_PPC_ADDR32:
141 case R_PPC_UADDR32:
142 PUTword(GETword(iaddr), oaddr);
143 break;
144
145 case R_PPC_ADDR24:
146 case R_PPC_REL24:
147 case R_PPC_PLT24:
148 case R_PPC_LOCAL24PC:
149 /* XXX - big assumption here that the original contents were masked
150 * properly. If this assumption proves correct, then these 24bit
151 * cases can be folded into the above 32bit cases.
152 */
153 PUTword(GETword(iaddr), oaddr);
154 break;
155
156 case R_PPC_ADDR16:
157 case R_PPC_UADDR16:
158 case R_PPC_GOT16:
159 PUThalf(GEThalf(iaddr), oaddr);
160 break;
161
162 case R_PPC_ADDR16_LO:
163 case R_PPC_GOT16_LO:
164 /* XXX - more assumptions which if proved correct, we can
165 * do some folding with above cases
166 */
167 PUThalf(GEThalf(iaddr), oaddr);
168 break;
169
170 case R_PPC_ADDR16_HI:
171 case R_PPC_GOT16_HI:
172 /* XXX - more assumptions which if proved correct, we can
173 * do some folding with above cases
174 */
175 PUThalf(GEThalf(iaddr), oaddr);
176 break;
177
178 case R_PPC_ADDR16_HA:
179 case R_PPC_GOT16_HA:
180 /* XXX - more assumptions which if proved correct, we can
181 * do some folding with above cases
182 */
183 PUThalf(GEThalf(iaddr), oaddr);
184 break;
185
186 case R_PPC_ADDR14:
187 case R_PPC_ADDR14_BRTAKEN:
188 case R_PPC_ADDR14_BRNTAKEN:
189 case R_PPC_REL14:
190 case R_PPC_REL14_BRTAKEN:
191 case R_PPC_REL14_BRNTAKEN:
192 /* XXX - big assumption here that the original contents were masked
193 * properly. If this assumption proves correct, then these 14bit
194 * cases can be folded into the above 32bit cases.
195 */
196 PUTword(GETword(iaddr), oaddr);
197 break;
198
199 case R_PPC_COPY:
200 break;
201
202 case R_PPC_GLOB_DAT:
203 case R_PPC_RELATIVE:
204 PUTword(GETword(iaddr), oaddr);
205 break;
206
207 case R_PPC_JMP_SLOT:
208 break;
209
210 default:
211 break;
212 }
213 }
214
215 void
216 update_reloc(Cache *ocache, Cache *_ocache, Cache *icache, Cache *_icache, Half shnum)
217 {
218 Shdr *shdr;
219 Rel *rels;
220 int reln, cnt;
221 Cache *orcache, * ircache;
222
223 /*
224 * Set up to read the output relocation table.
225 */
226 shdr = _ocache->c_shdr;
227 rels = (Rel *)_ocache->c_data->d_buf;
228 reln = shdr->sh_size / shdr->sh_entsize;
229
230 /*
231 * Determine the section that is being relocated.
232 */
233 orcache = &ocache[shdr->sh_info];
234 shdr = _icache->c_shdr;
235 ircache = &icache[shdr->sh_info];
236
237 /*
238 * Loop through the relocation table.
239 */
240 for (cnt = 0; cnt < reln; cnt++, rels++) {
241 unsigned char type = ELF_R_TYPE(rels->r_info);
242
243 /*
244 * Ignore some relocations as these can safely be carried out
245 * twice (they simply override any existing data). In fact,
246 * some relocations like __iob's copy relocation must be carried
247 * out each time the process restarts otherwise stdio blows up.
248 */
249 if ((type == R_PPC_COPY) || (type == R_PPC_JMP_SLOT) ||
250 (type == R_PPC_NONE))
251 continue;
252
253 {
254 unsigned char *iaddr, *oaddr;
255 Addr off;
256
257 /*
258 * If we are required to restore the relocation location
259 * to it's value prior to relocation, then read the
260 * locations original contents from the input image and
261 * copy it to the output image.
262 */
263 off = rels->r_offset - ircache->c_shdr->sh_addr;
264 iaddr = (unsigned char *)ircache->c_data->d_buf + off;
265 oaddr = (unsigned char *)orcache->c_data->d_buf + off;
266 move_reloc(iaddr, oaddr, type);
267 }
268 }
269 }