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1da177e4 LT |
1 | /* |
2 | * Program to hack in a PT_NOTE program header entry in an ELF file. | |
3 | * This is needed for OF on RS/6000s to load an image correctly. | |
4 | * Note that OF needs a program header entry for the note, not an | |
5 | * ELF section. | |
6 | * | |
7 | * Copyright 2000 Paul Mackerras. | |
8 | * | |
284b52c4 CLG |
9 | * Adapted for 64 bit little endian images by Andrew Tauferner. |
10 | * | |
1da177e4 LT |
11 | * This program is free software; you can redistribute it and/or |
12 | * modify it under the terms of the GNU General Public License | |
13 | * as published by the Free Software Foundation; either version | |
14 | * 2 of the License, or (at your option) any later version. | |
15 | * | |
5663a123 | 16 | * Usage: addnote zImage |
1da177e4 LT |
17 | */ |
18 | #include <stdio.h> | |
19 | #include <stdlib.h> | |
20 | #include <fcntl.h> | |
21 | #include <unistd.h> | |
22 | #include <string.h> | |
23 | ||
66faf984 | 24 | /* CHRP note section */ |
4e74fd7d | 25 | static const char arch[] = "PowerPC"; |
1da177e4 LT |
26 | |
27 | #define N_DESCR 6 | |
28 | unsigned int descr[N_DESCR] = { | |
29 | 0xffffffff, /* real-mode = true */ | |
9b09c6d9 | 30 | 0x02000000, /* real-base, i.e. where we expect OF to be */ |
1da177e4 LT |
31 | 0xffffffff, /* real-size */ |
32 | 0xffffffff, /* virt-base */ | |
33 | 0xffffffff, /* virt-size */ | |
34 | 0x4000, /* load-base */ | |
35 | }; | |
36 | ||
66faf984 | 37 | /* RPA note section */ |
4e74fd7d | 38 | static const char rpaname[] = "IBM,RPA-Client-Config"; |
66faf984 PM |
39 | |
40 | /* | |
41 | * Note: setting ignore_my_client_config *should* mean that OF ignores | |
42 | * all the other fields, but there is a firmware bug which means that | |
43 | * it looks at the splpar field at least. So these values need to be | |
44 | * reasonable. | |
45 | */ | |
46 | #define N_RPA_DESCR 8 | |
47 | unsigned int rpanote[N_RPA_DESCR] = { | |
5663a123 PM |
48 | 0, /* lparaffinity */ |
49 | 64, /* min_rmo_size */ | |
66faf984 | 50 | 0, /* min_rmo_percent */ |
5663a123 | 51 | 40, /* max_pft_size */ |
66faf984 PM |
52 | 1, /* splpar */ |
53 | -1, /* min_load */ | |
5663a123 PM |
54 | 0, /* new_mem_def */ |
55 | 1, /* ignore_my_client_config */ | |
66faf984 PM |
56 | }; |
57 | ||
58 | #define ROUNDUP(len) (((len) + 3) & ~3) | |
59 | ||
284b52c4 CLG |
60 | unsigned char buf[1024]; |
61 | #define ELFDATA2LSB 1 | |
62 | #define ELFDATA2MSB 2 | |
63 | static int e_data = ELFDATA2MSB; | |
64 | #define ELFCLASS32 1 | |
65 | #define ELFCLASS64 2 | |
66 | static int e_class = ELFCLASS32; | |
1da177e4 | 67 | |
5663a123 | 68 | #define GET_16BE(off) ((buf[off] << 8) + (buf[(off)+1])) |
284b52c4 CLG |
69 | #define GET_32BE(off) ((GET_16BE(off) << 16U) + GET_16BE((off)+2U)) |
70 | #define GET_64BE(off) ((((unsigned long long)GET_32BE(off)) << 32ULL) + \ | |
71 | ((unsigned long long)GET_32BE((off)+4ULL))) | |
72 | #define PUT_16BE(off, v)(buf[off] = ((v) >> 8) & 0xff, \ | |
73 | buf[(off) + 1] = (v) & 0xff) | |
74 | #define PUT_32BE(off, v)(PUT_16BE((off), (v) >> 16L), PUT_16BE((off) + 2, (v))) | |
75 | #define PUT_64BE(off, v)((PUT_32BE((off), (v) >> 32L), \ | |
76 | PUT_32BE((off) + 4, (v)))) | |
77 | ||
78 | #define GET_16LE(off) ((buf[off]) + (buf[(off)+1] << 8)) | |
79 | #define GET_32LE(off) (GET_16LE(off) + (GET_16LE((off)+2U) << 16U)) | |
80 | #define GET_64LE(off) ((unsigned long long)GET_32LE(off) + \ | |
81 | (((unsigned long long)GET_32LE((off)+4ULL)) << 32ULL)) | |
82 | #define PUT_16LE(off, v) (buf[off] = (v) & 0xff, \ | |
83 | buf[(off) + 1] = ((v) >> 8) & 0xff) | |
84 | #define PUT_32LE(off, v) (PUT_16LE((off), (v)), PUT_16LE((off) + 2, (v) >> 16L)) | |
85 | #define PUT_64LE(off, v) (PUT_32LE((off), (v)), PUT_32LE((off) + 4, (v) >> 32L)) | |
86 | ||
87 | #define GET_16(off) (e_data == ELFDATA2MSB ? GET_16BE(off) : GET_16LE(off)) | |
88 | #define GET_32(off) (e_data == ELFDATA2MSB ? GET_32BE(off) : GET_32LE(off)) | |
89 | #define GET_64(off) (e_data == ELFDATA2MSB ? GET_64BE(off) : GET_64LE(off)) | |
90 | #define PUT_16(off, v) (e_data == ELFDATA2MSB ? PUT_16BE(off, v) : \ | |
91 | PUT_16LE(off, v)) | |
92 | #define PUT_32(off, v) (e_data == ELFDATA2MSB ? PUT_32BE(off, v) : \ | |
93 | PUT_32LE(off, v)) | |
94 | #define PUT_64(off, v) (e_data == ELFDATA2MSB ? PUT_64BE(off, v) : \ | |
95 | PUT_64LE(off, v)) | |
1da177e4 LT |
96 | |
97 | /* Structure of an ELF file */ | |
98 | #define E_IDENT 0 /* ELF header */ | |
284b52c4 CLG |
99 | #define E_PHOFF (e_class == ELFCLASS32 ? 28 : 32) |
100 | #define E_PHENTSIZE (e_class == ELFCLASS32 ? 42 : 54) | |
101 | #define E_PHNUM (e_class == ELFCLASS32 ? 44 : 56) | |
102 | #define E_HSIZE (e_class == ELFCLASS32 ? 52 : 64) | |
1da177e4 LT |
103 | |
104 | #define EI_MAGIC 0 /* offsets in E_IDENT area */ | |
105 | #define EI_CLASS 4 | |
106 | #define EI_DATA 5 | |
107 | ||
108 | #define PH_TYPE 0 /* ELF program header */ | |
284b52c4 CLG |
109 | #define PH_OFFSET (e_class == ELFCLASS32 ? 4 : 8) |
110 | #define PH_FILESZ (e_class == ELFCLASS32 ? 16 : 32) | |
111 | #define PH_HSIZE (e_class == ELFCLASS32 ? 32 : 56) | |
1da177e4 LT |
112 | |
113 | #define PT_NOTE 4 /* Program header type = note */ | |
114 | ||
1da177e4 LT |
115 | |
116 | unsigned char elf_magic[4] = { 0x7f, 'E', 'L', 'F' }; | |
117 | ||
118 | int | |
119 | main(int ac, char **av) | |
120 | { | |
5663a123 | 121 | int fd, n, i; |
284b52c4 CLG |
122 | unsigned long ph, ps, np; |
123 | long nnote, nnote2, ns; | |
5663a123 PM |
124 | |
125 | if (ac != 2) { | |
126 | fprintf(stderr, "Usage: %s elf-file\n", av[0]); | |
1da177e4 LT |
127 | exit(1); |
128 | } | |
5663a123 | 129 | fd = open(av[1], O_RDWR); |
1da177e4 | 130 | if (fd < 0) { |
5663a123 | 131 | perror(av[1]); |
1da177e4 LT |
132 | exit(1); |
133 | } | |
134 | ||
66faf984 PM |
135 | nnote = 12 + ROUNDUP(strlen(arch) + 1) + sizeof(descr); |
136 | nnote2 = 12 + ROUNDUP(strlen(rpaname) + 1) + sizeof(rpanote); | |
1da177e4 LT |
137 | |
138 | n = read(fd, buf, sizeof(buf)); | |
139 | if (n < 0) { | |
140 | perror("read"); | |
141 | exit(1); | |
142 | } | |
143 | ||
284b52c4 CLG |
144 | if (memcmp(&buf[E_IDENT+EI_MAGIC], elf_magic, 4) != 0) |
145 | goto notelf; | |
146 | e_class = buf[E_IDENT+EI_CLASS]; | |
147 | if (e_class != ELFCLASS32 && e_class != ELFCLASS64) | |
148 | goto notelf; | |
149 | e_data = buf[E_IDENT+EI_DATA]; | |
150 | if (e_data != ELFDATA2MSB && e_data != ELFDATA2LSB) | |
151 | goto notelf; | |
152 | if (n < E_HSIZE) | |
1da177e4 LT |
153 | goto notelf; |
154 | ||
284b52c4 CLG |
155 | ph = (e_class == ELFCLASS32 ? GET_32(E_PHOFF) : GET_64(E_PHOFF)); |
156 | ps = GET_16(E_PHENTSIZE); | |
157 | np = GET_16(E_PHNUM); | |
1da177e4 LT |
158 | if (ph < E_HSIZE || ps < PH_HSIZE || np < 1) |
159 | goto notelf; | |
66faf984 | 160 | if (ph + (np + 2) * ps + nnote + nnote2 > n) |
1da177e4 LT |
161 | goto nospace; |
162 | ||
163 | for (i = 0; i < np; ++i) { | |
284b52c4 | 164 | if (GET_32(ph + PH_TYPE) == PT_NOTE) { |
1da177e4 | 165 | fprintf(stderr, "%s already has a note entry\n", |
5663a123 | 166 | av[1]); |
1da177e4 LT |
167 | exit(0); |
168 | } | |
169 | ph += ps; | |
170 | } | |
171 | ||
172 | /* XXX check that the area we want to use is all zeroes */ | |
66faf984 | 173 | for (i = 0; i < 2 * ps + nnote + nnote2; ++i) |
1da177e4 LT |
174 | if (buf[ph + i] != 0) |
175 | goto nospace; | |
176 | ||
177 | /* fill in the program header entry */ | |
66faf984 | 178 | ns = ph + 2 * ps; |
284b52c4 CLG |
179 | PUT_32(ph + PH_TYPE, PT_NOTE); |
180 | if (e_class == ELFCLASS32) | |
181 | PUT_32(ph + PH_OFFSET, ns); | |
182 | else | |
183 | PUT_64(ph + PH_OFFSET, ns); | |
184 | ||
185 | if (e_class == ELFCLASS32) | |
186 | PUT_32(ph + PH_FILESZ, nnote); | |
187 | else | |
188 | PUT_64(ph + PH_FILESZ, nnote); | |
1da177e4 LT |
189 | |
190 | /* fill in the note area we point to */ | |
191 | /* XXX we should probably make this a proper section */ | |
284b52c4 CLG |
192 | PUT_32(ns, strlen(arch) + 1); |
193 | PUT_32(ns + 4, N_DESCR * 4); | |
194 | PUT_32(ns + 8, 0x1275); | |
decd300b | 195 | strcpy((char *) &buf[ns + 12], arch); |
1da177e4 | 196 | ns += 12 + strlen(arch) + 1; |
66faf984 | 197 | for (i = 0; i < N_DESCR; ++i, ns += 4) |
5663a123 | 198 | PUT_32BE(ns, descr[i]); |
66faf984 PM |
199 | |
200 | /* fill in the second program header entry and the RPA note area */ | |
201 | ph += ps; | |
284b52c4 CLG |
202 | PUT_32(ph + PH_TYPE, PT_NOTE); |
203 | if (e_class == ELFCLASS32) | |
204 | PUT_32(ph + PH_OFFSET, ns); | |
205 | else | |
206 | PUT_64(ph + PH_OFFSET, ns); | |
207 | ||
208 | if (e_class == ELFCLASS32) | |
209 | PUT_32(ph + PH_FILESZ, nnote); | |
210 | else | |
211 | PUT_64(ph + PH_FILESZ, nnote2); | |
66faf984 PM |
212 | |
213 | /* fill in the note area we point to */ | |
284b52c4 CLG |
214 | PUT_32(ns, strlen(rpaname) + 1); |
215 | PUT_32(ns + 4, sizeof(rpanote)); | |
216 | PUT_32(ns + 8, 0x12759999); | |
5663a123 PM |
217 | strcpy((char *) &buf[ns + 12], rpaname); |
218 | ns += 12 + ROUNDUP(strlen(rpaname) + 1); | |
219 | for (i = 0; i < N_RPA_DESCR; ++i, ns += 4) | |
220 | PUT_32BE(ns, rpanote[i]); | |
1da177e4 LT |
221 | |
222 | /* Update the number of program headers */ | |
284b52c4 | 223 | PUT_16(E_PHNUM, np + 2); |
1da177e4 LT |
224 | |
225 | /* write back */ | |
226 | lseek(fd, (long) 0, SEEK_SET); | |
227 | i = write(fd, buf, n); | |
228 | if (i < 0) { | |
229 | perror("write"); | |
230 | exit(1); | |
231 | } | |
232 | if (i < n) { | |
5663a123 | 233 | fprintf(stderr, "%s: write truncated\n", av[1]); |
1da177e4 LT |
234 | exit(1); |
235 | } | |
236 | ||
237 | exit(0); | |
238 | ||
239 | notelf: | |
5663a123 | 240 | fprintf(stderr, "%s does not appear to be an ELF file\n", av[1]); |
1da177e4 LT |
241 | exit(1); |
242 | ||
243 | nospace: | |
244 | fprintf(stderr, "sorry, I can't find space in %s to put the note\n", | |
5663a123 | 245 | av[1]); |
1da177e4 LT |
246 | exit(1); |
247 | } |