Merge tag 'for-6.2-rc7-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave...
[platform/kernel/linux-starfive.git] / scripts / sorttable.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * sorttable.c: Sort the kernel's table
4  *
5  * Added ORC unwind tables sort support and other updates:
6  * Copyright (C) 1999-2019 Alibaba Group Holding Limited. by:
7  * Shile Zhang <shile.zhang@linux.alibaba.com>
8  *
9  * Copyright 2011 - 2012 Cavium, Inc.
10  *
11  * Based on code taken from recortmcount.c which is:
12  *
13  * Copyright 2009 John F. Reiser <jreiser@BitWagon.com>.  All rights reserved.
14  *
15  * Restructured to fit Linux format, as well as other updates:
16  * Copyright 2010 Steven Rostedt <srostedt@redhat.com>, Red Hat Inc.
17  */
18
19 /*
20  * Strategy: alter the vmlinux file in-place.
21  */
22
23 #include <sys/types.h>
24 #include <sys/mman.h>
25 #include <sys/stat.h>
26 #include <getopt.h>
27 #include <elf.h>
28 #include <fcntl.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <string.h>
32 #include <unistd.h>
33 #include <errno.h>
34 #include <pthread.h>
35
36 #include <tools/be_byteshift.h>
37 #include <tools/le_byteshift.h>
38
39 #ifndef EM_ARCOMPACT
40 #define EM_ARCOMPACT    93
41 #endif
42
43 #ifndef EM_XTENSA
44 #define EM_XTENSA       94
45 #endif
46
47 #ifndef EM_AARCH64
48 #define EM_AARCH64      183
49 #endif
50
51 #ifndef EM_MICROBLAZE
52 #define EM_MICROBLAZE   189
53 #endif
54
55 #ifndef EM_ARCV2
56 #define EM_ARCV2        195
57 #endif
58
59 #ifndef EM_RISCV
60 #define EM_RISCV        243
61 #endif
62
63 #ifndef EM_LOONGARCH
64 #define EM_LOONGARCH    258
65 #endif
66
67 static uint32_t (*r)(const uint32_t *);
68 static uint16_t (*r2)(const uint16_t *);
69 static uint64_t (*r8)(const uint64_t *);
70 static void (*w)(uint32_t, uint32_t *);
71 static void (*w2)(uint16_t, uint16_t *);
72 static void (*w8)(uint64_t, uint64_t *);
73 typedef void (*table_sort_t)(char *, int);
74
75 /*
76  * Get the whole file as a programming convenience in order to avoid
77  * malloc+lseek+read+free of many pieces.  If successful, then mmap
78  * avoids copying unused pieces; else just read the whole file.
79  * Open for both read and write.
80  */
81 static void *mmap_file(char const *fname, size_t *size)
82 {
83         int fd;
84         struct stat sb;
85         void *addr = NULL;
86
87         fd = open(fname, O_RDWR);
88         if (fd < 0) {
89                 perror(fname);
90                 return NULL;
91         }
92         if (fstat(fd, &sb) < 0) {
93                 perror(fname);
94                 goto out;
95         }
96         if (!S_ISREG(sb.st_mode)) {
97                 fprintf(stderr, "not a regular file: %s\n", fname);
98                 goto out;
99         }
100
101         addr = mmap(0, sb.st_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
102         if (addr == MAP_FAILED) {
103                 fprintf(stderr, "Could not mmap file: %s\n", fname);
104                 goto out;
105         }
106
107         *size = sb.st_size;
108
109 out:
110         close(fd);
111         return addr;
112 }
113
114 static uint32_t rbe(const uint32_t *x)
115 {
116         return get_unaligned_be32(x);
117 }
118
119 static uint16_t r2be(const uint16_t *x)
120 {
121         return get_unaligned_be16(x);
122 }
123
124 static uint64_t r8be(const uint64_t *x)
125 {
126         return get_unaligned_be64(x);
127 }
128
129 static uint32_t rle(const uint32_t *x)
130 {
131         return get_unaligned_le32(x);
132 }
133
134 static uint16_t r2le(const uint16_t *x)
135 {
136         return get_unaligned_le16(x);
137 }
138
139 static uint64_t r8le(const uint64_t *x)
140 {
141         return get_unaligned_le64(x);
142 }
143
144 static void wbe(uint32_t val, uint32_t *x)
145 {
146         put_unaligned_be32(val, x);
147 }
148
149 static void w2be(uint16_t val, uint16_t *x)
150 {
151         put_unaligned_be16(val, x);
152 }
153
154 static void w8be(uint64_t val, uint64_t *x)
155 {
156         put_unaligned_be64(val, x);
157 }
158
159 static void wle(uint32_t val, uint32_t *x)
160 {
161         put_unaligned_le32(val, x);
162 }
163
164 static void w2le(uint16_t val, uint16_t *x)
165 {
166         put_unaligned_le16(val, x);
167 }
168
169 static void w8le(uint64_t val, uint64_t *x)
170 {
171         put_unaligned_le64(val, x);
172 }
173
174 /*
175  * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of
176  * the way to -256..-1, to avoid conflicting with real section
177  * indices.
178  */
179 #define SPECIAL(i) ((i) - (SHN_HIRESERVE + 1))
180
181 static inline int is_shndx_special(unsigned int i)
182 {
183         return i != SHN_XINDEX && i >= SHN_LORESERVE && i <= SHN_HIRESERVE;
184 }
185
186 /* Accessor for sym->st_shndx, hides ugliness of "64k sections" */
187 static inline unsigned int get_secindex(unsigned int shndx,
188                                         unsigned int sym_offs,
189                                         const Elf32_Word *symtab_shndx_start)
190 {
191         if (is_shndx_special(shndx))
192                 return SPECIAL(shndx);
193         if (shndx != SHN_XINDEX)
194                 return shndx;
195         return r(&symtab_shndx_start[sym_offs]);
196 }
197
198 /* 32 bit and 64 bit are very similar */
199 #include "sorttable.h"
200 #define SORTTABLE_64
201 #include "sorttable.h"
202
203 static int compare_relative_table(const void *a, const void *b)
204 {
205         int32_t av = (int32_t)r(a);
206         int32_t bv = (int32_t)r(b);
207
208         if (av < bv)
209                 return -1;
210         if (av > bv)
211                 return 1;
212         return 0;
213 }
214
215 static void sort_relative_table(char *extab_image, int image_size)
216 {
217         int i = 0;
218
219         /*
220          * Do the same thing the runtime sort does, first normalize to
221          * being relative to the start of the section.
222          */
223         while (i < image_size) {
224                 uint32_t *loc = (uint32_t *)(extab_image + i);
225                 w(r(loc) + i, loc);
226                 i += 4;
227         }
228
229         qsort(extab_image, image_size / 8, 8, compare_relative_table);
230
231         /* Now denormalize. */
232         i = 0;
233         while (i < image_size) {
234                 uint32_t *loc = (uint32_t *)(extab_image + i);
235                 w(r(loc) - i, loc);
236                 i += 4;
237         }
238 }
239
240 static void sort_relative_table_with_data(char *extab_image, int image_size)
241 {
242         int i = 0;
243
244         while (i < image_size) {
245                 uint32_t *loc = (uint32_t *)(extab_image + i);
246
247                 w(r(loc) + i, loc);
248                 w(r(loc + 1) + i + 4, loc + 1);
249                 /* Don't touch the fixup type or data */
250
251                 i += sizeof(uint32_t) * 3;
252         }
253
254         qsort(extab_image, image_size / 12, 12, compare_relative_table);
255
256         i = 0;
257         while (i < image_size) {
258                 uint32_t *loc = (uint32_t *)(extab_image + i);
259
260                 w(r(loc) - i, loc);
261                 w(r(loc + 1) - (i + 4), loc + 1);
262                 /* Don't touch the fixup type or data */
263
264                 i += sizeof(uint32_t) * 3;
265         }
266 }
267
268 static int do_file(char const *const fname, void *addr)
269 {
270         int rc = -1;
271         Elf32_Ehdr *ehdr = addr;
272         table_sort_t custom_sort = NULL;
273
274         switch (ehdr->e_ident[EI_DATA]) {
275         case ELFDATA2LSB:
276                 r       = rle;
277                 r2      = r2le;
278                 r8      = r8le;
279                 w       = wle;
280                 w2      = w2le;
281                 w8      = w8le;
282                 break;
283         case ELFDATA2MSB:
284                 r       = rbe;
285                 r2      = r2be;
286                 r8      = r8be;
287                 w       = wbe;
288                 w2      = w2be;
289                 w8      = w8be;
290                 break;
291         default:
292                 fprintf(stderr, "unrecognized ELF data encoding %d: %s\n",
293                         ehdr->e_ident[EI_DATA], fname);
294                 return -1;
295         }
296
297         if (memcmp(ELFMAG, ehdr->e_ident, SELFMAG) != 0 ||
298             (r2(&ehdr->e_type) != ET_EXEC && r2(&ehdr->e_type) != ET_DYN) ||
299             ehdr->e_ident[EI_VERSION] != EV_CURRENT) {
300                 fprintf(stderr, "unrecognized ET_EXEC/ET_DYN file %s\n", fname);
301                 return -1;
302         }
303
304         switch (r2(&ehdr->e_machine)) {
305         case EM_386:
306         case EM_AARCH64:
307         case EM_LOONGARCH:
308         case EM_RISCV:
309         case EM_S390:
310         case EM_X86_64:
311                 custom_sort = sort_relative_table_with_data;
312                 break;
313         case EM_PARISC:
314         case EM_PPC:
315         case EM_PPC64:
316                 custom_sort = sort_relative_table;
317                 break;
318         case EM_ARCOMPACT:
319         case EM_ARCV2:
320         case EM_ARM:
321         case EM_MICROBLAZE:
322         case EM_MIPS:
323         case EM_XTENSA:
324                 break;
325         default:
326                 fprintf(stderr, "unrecognized e_machine %d %s\n",
327                         r2(&ehdr->e_machine), fname);
328                 return -1;
329         }
330
331         switch (ehdr->e_ident[EI_CLASS]) {
332         case ELFCLASS32:
333                 if (r2(&ehdr->e_ehsize) != sizeof(Elf32_Ehdr) ||
334                     r2(&ehdr->e_shentsize) != sizeof(Elf32_Shdr)) {
335                         fprintf(stderr,
336                                 "unrecognized ET_EXEC/ET_DYN file: %s\n", fname);
337                         break;
338                 }
339                 rc = do_sort_32(ehdr, fname, custom_sort);
340                 break;
341         case ELFCLASS64:
342                 {
343                 Elf64_Ehdr *const ghdr = (Elf64_Ehdr *)ehdr;
344                 if (r2(&ghdr->e_ehsize) != sizeof(Elf64_Ehdr) ||
345                     r2(&ghdr->e_shentsize) != sizeof(Elf64_Shdr)) {
346                         fprintf(stderr,
347                                 "unrecognized ET_EXEC/ET_DYN file: %s\n",
348                                 fname);
349                         break;
350                 }
351                 rc = do_sort_64(ghdr, fname, custom_sort);
352                 }
353                 break;
354         default:
355                 fprintf(stderr, "unrecognized ELF class %d %s\n",
356                         ehdr->e_ident[EI_CLASS], fname);
357                 break;
358         }
359
360         return rc;
361 }
362
363 int main(int argc, char *argv[])
364 {
365         int i, n_error = 0;  /* gcc-4.3.0 false positive complaint */
366         size_t size = 0;
367         void *addr = NULL;
368
369         if (argc < 2) {
370                 fprintf(stderr, "usage: sorttable vmlinux...\n");
371                 return 0;
372         }
373
374         /* Process each file in turn, allowing deep failure. */
375         for (i = 1; i < argc; i++) {
376                 addr = mmap_file(argv[i], &size);
377                 if (!addr) {
378                         ++n_error;
379                         continue;
380                 }
381
382                 if (do_file(argv[i], addr))
383                         ++n_error;
384
385                 munmap(addr, size);
386         }
387
388         return !!n_error;
389 }