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Source at commit 2604e7f9a98c27be50a0c3ff7503b6a5ea8f6cfe created 12 years 7 months ago. By Maarten ter Huurne, cpufreq_stats: Support runtime changes to frequency table | |
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1 | /* |
2 | * recordmcount.h |
3 | * |
4 | * This code was taken out of recordmcount.c written by |
5 | * Copyright 2009 John F. Reiser <jreiser@BitWagon.com>. All rights reserved. |
6 | * |
7 | * The original code had the same algorithms for both 32bit |
8 | * and 64bit ELF files, but the code was duplicated to support |
9 | * the difference in structures that were used. This |
10 | * file creates a macro of everything that is different between |
11 | * the 64 and 32 bit code, such that by including this header |
12 | * twice we can create both sets of functions by including this |
13 | * header once with RECORD_MCOUNT_64 undefined, and again with |
14 | * it defined. |
15 | * |
16 | * This conversion to macros was done by: |
17 | * Copyright 2010 Steven Rostedt <srostedt@redhat.com>, Red Hat Inc. |
18 | * |
19 | * Licensed under the GNU General Public License, version 2 (GPLv2). |
20 | */ |
21 | #undef append_func |
22 | #undef is_fake_mcount |
23 | #undef fn_is_fake_mcount |
24 | #undef MIPS_is_fake_mcount |
25 | #undef mcount_adjust |
26 | #undef sift_rel_mcount |
27 | #undef nop_mcount |
28 | #undef find_secsym_ndx |
29 | #undef __has_rel_mcount |
30 | #undef has_rel_mcount |
31 | #undef tot_relsize |
32 | #undef get_mcountsym |
33 | #undef get_sym_str_and_relp |
34 | #undef do_func |
35 | #undef Elf_Addr |
36 | #undef Elf_Ehdr |
37 | #undef Elf_Shdr |
38 | #undef Elf_Rel |
39 | #undef Elf_Rela |
40 | #undef Elf_Sym |
41 | #undef ELF_R_SYM |
42 | #undef Elf_r_sym |
43 | #undef ELF_R_INFO |
44 | #undef Elf_r_info |
45 | #undef ELF_ST_BIND |
46 | #undef ELF_ST_TYPE |
47 | #undef fn_ELF_R_SYM |
48 | #undef fn_ELF_R_INFO |
49 | #undef uint_t |
50 | #undef _w |
51 | #undef _align |
52 | #undef _size |
53 | |
54 | #ifdef RECORD_MCOUNT_64 |
55 | # define append_func append64 |
56 | # define sift_rel_mcount sift64_rel_mcount |
57 | # define nop_mcount nop_mcount_64 |
58 | # define find_secsym_ndx find64_secsym_ndx |
59 | # define __has_rel_mcount __has64_rel_mcount |
60 | # define has_rel_mcount has64_rel_mcount |
61 | # define tot_relsize tot64_relsize |
62 | # define get_sym_str_and_relp get_sym_str_and_relp_64 |
63 | # define do_func do64 |
64 | # define get_mcountsym get_mcountsym_64 |
65 | # define is_fake_mcount is_fake_mcount64 |
66 | # define fn_is_fake_mcount fn_is_fake_mcount64 |
67 | # define MIPS_is_fake_mcount MIPS64_is_fake_mcount |
68 | # define mcount_adjust mcount_adjust_64 |
69 | # define Elf_Addr Elf64_Addr |
70 | # define Elf_Ehdr Elf64_Ehdr |
71 | # define Elf_Shdr Elf64_Shdr |
72 | # define Elf_Rel Elf64_Rel |
73 | # define Elf_Rela Elf64_Rela |
74 | # define Elf_Sym Elf64_Sym |
75 | # define ELF_R_SYM ELF64_R_SYM |
76 | # define Elf_r_sym Elf64_r_sym |
77 | # define ELF_R_INFO ELF64_R_INFO |
78 | # define Elf_r_info Elf64_r_info |
79 | # define ELF_ST_BIND ELF64_ST_BIND |
80 | # define ELF_ST_TYPE ELF64_ST_TYPE |
81 | # define fn_ELF_R_SYM fn_ELF64_R_SYM |
82 | # define fn_ELF_R_INFO fn_ELF64_R_INFO |
83 | # define uint_t uint64_t |
84 | # define _w w8 |
85 | # define _align 7u |
86 | # define _size 8 |
87 | #else |
88 | # define append_func append32 |
89 | # define sift_rel_mcount sift32_rel_mcount |
90 | # define nop_mcount nop_mcount_32 |
91 | # define find_secsym_ndx find32_secsym_ndx |
92 | # define __has_rel_mcount __has32_rel_mcount |
93 | # define has_rel_mcount has32_rel_mcount |
94 | # define tot_relsize tot32_relsize |
95 | # define get_sym_str_and_relp get_sym_str_and_relp_32 |
96 | # define do_func do32 |
97 | # define get_mcountsym get_mcountsym_32 |
98 | # define is_fake_mcount is_fake_mcount32 |
99 | # define fn_is_fake_mcount fn_is_fake_mcount32 |
100 | # define MIPS_is_fake_mcount MIPS32_is_fake_mcount |
101 | # define mcount_adjust mcount_adjust_32 |
102 | # define Elf_Addr Elf32_Addr |
103 | # define Elf_Ehdr Elf32_Ehdr |
104 | # define Elf_Shdr Elf32_Shdr |
105 | # define Elf_Rel Elf32_Rel |
106 | # define Elf_Rela Elf32_Rela |
107 | # define Elf_Sym Elf32_Sym |
108 | # define ELF_R_SYM ELF32_R_SYM |
109 | # define Elf_r_sym Elf32_r_sym |
110 | # define ELF_R_INFO ELF32_R_INFO |
111 | # define Elf_r_info Elf32_r_info |
112 | # define ELF_ST_BIND ELF32_ST_BIND |
113 | # define ELF_ST_TYPE ELF32_ST_TYPE |
114 | # define fn_ELF_R_SYM fn_ELF32_R_SYM |
115 | # define fn_ELF_R_INFO fn_ELF32_R_INFO |
116 | # define uint_t uint32_t |
117 | # define _w w |
118 | # define _align 3u |
119 | # define _size 4 |
120 | #endif |
121 | |
122 | /* Functions and pointers that do_file() may override for specific e_machine. */ |
123 | static int fn_is_fake_mcount(Elf_Rel const *rp) |
124 | { |
125 | return 0; |
126 | } |
127 | static int (*is_fake_mcount)(Elf_Rel const *rp) = fn_is_fake_mcount; |
128 | |
129 | static uint_t fn_ELF_R_SYM(Elf_Rel const *rp) |
130 | { |
131 | return ELF_R_SYM(_w(rp->r_info)); |
132 | } |
133 | static uint_t (*Elf_r_sym)(Elf_Rel const *rp) = fn_ELF_R_SYM; |
134 | |
135 | static void fn_ELF_R_INFO(Elf_Rel *const rp, unsigned sym, unsigned type) |
136 | { |
137 | rp->r_info = _w(ELF_R_INFO(sym, type)); |
138 | } |
139 | static void (*Elf_r_info)(Elf_Rel *const rp, unsigned sym, unsigned type) = fn_ELF_R_INFO; |
140 | |
141 | static int mcount_adjust = 0; |
142 | |
143 | /* |
144 | * MIPS mcount long call has 2 _mcount symbols, only the position of the 1st |
145 | * _mcount symbol is needed for dynamic function tracer, with it, to disable |
146 | * tracing(ftrace_make_nop), the instruction in the position is replaced with |
147 | * the "b label" instruction, to enable tracing(ftrace_make_call), replace the |
148 | * instruction back. So, here, we set the 2nd one as fake and filter it. |
149 | * |
150 | * c: 3c030000 lui v1,0x0 <--> b label |
151 | * c: R_MIPS_HI16 _mcount |
152 | * c: R_MIPS_NONE *ABS* |
153 | * c: R_MIPS_NONE *ABS* |
154 | * 10: 64630000 daddiu v1,v1,0 |
155 | * 10: R_MIPS_LO16 _mcount |
156 | * 10: R_MIPS_NONE *ABS* |
157 | * 10: R_MIPS_NONE *ABS* |
158 | * 14: 03e0082d move at,ra |
159 | * 18: 0060f809 jalr v1 |
160 | * label: |
161 | */ |
162 | #define MIPS_FAKEMCOUNT_OFFSET 4 |
163 | |
164 | static int MIPS_is_fake_mcount(Elf_Rel const *rp) |
165 | { |
166 | static Elf_Addr old_r_offset; |
167 | Elf_Addr current_r_offset = _w(rp->r_offset); |
168 | int is_fake; |
169 | |
170 | is_fake = old_r_offset && |
171 | (current_r_offset - old_r_offset == MIPS_FAKEMCOUNT_OFFSET); |
172 | old_r_offset = current_r_offset; |
173 | |
174 | return is_fake; |
175 | } |
176 | |
177 | /* Append the new shstrtab, Elf_Shdr[], __mcount_loc and its relocations. */ |
178 | static void append_func(Elf_Ehdr *const ehdr, |
179 | Elf_Shdr *const shstr, |
180 | uint_t const *const mloc0, |
181 | uint_t const *const mlocp, |
182 | Elf_Rel const *const mrel0, |
183 | Elf_Rel const *const mrelp, |
184 | unsigned int const rel_entsize, |
185 | unsigned int const symsec_sh_link) |
186 | { |
187 | /* Begin constructing output file */ |
188 | Elf_Shdr mcsec; |
189 | char const *mc_name = (sizeof(Elf_Rela) == rel_entsize) |
190 | ? ".rela__mcount_loc" |
191 | : ".rel__mcount_loc"; |
192 | unsigned const old_shnum = w2(ehdr->e_shnum); |
193 | uint_t const old_shoff = _w(ehdr->e_shoff); |
194 | uint_t const old_shstr_sh_size = _w(shstr->sh_size); |
195 | uint_t const old_shstr_sh_offset = _w(shstr->sh_offset); |
196 | uint_t t = 1 + strlen(mc_name) + _w(shstr->sh_size); |
197 | uint_t new_e_shoff; |
198 | |
199 | shstr->sh_size = _w(t); |
200 | shstr->sh_offset = _w(sb.st_size); |
201 | t += sb.st_size; |
202 | t += (_align & -t); /* word-byte align */ |
203 | new_e_shoff = t; |
204 | |
205 | /* body for new shstrtab */ |
206 | ulseek(fd_map, sb.st_size, SEEK_SET); |
207 | uwrite(fd_map, old_shstr_sh_offset + (void *)ehdr, old_shstr_sh_size); |
208 | uwrite(fd_map, mc_name, 1 + strlen(mc_name)); |
209 | |
210 | /* old(modified) Elf_Shdr table, word-byte aligned */ |
211 | ulseek(fd_map, t, SEEK_SET); |
212 | t += sizeof(Elf_Shdr) * old_shnum; |
213 | uwrite(fd_map, old_shoff + (void *)ehdr, |
214 | sizeof(Elf_Shdr) * old_shnum); |
215 | |
216 | /* new sections __mcount_loc and .rel__mcount_loc */ |
217 | t += 2*sizeof(mcsec); |
218 | mcsec.sh_name = w((sizeof(Elf_Rela) == rel_entsize) + strlen(".rel") |
219 | + old_shstr_sh_size); |
220 | mcsec.sh_type = w(SHT_PROGBITS); |
221 | mcsec.sh_flags = _w(SHF_ALLOC); |
222 | mcsec.sh_addr = 0; |
223 | mcsec.sh_offset = _w(t); |
224 | mcsec.sh_size = _w((void *)mlocp - (void *)mloc0); |
225 | mcsec.sh_link = 0; |
226 | mcsec.sh_info = 0; |
227 | mcsec.sh_addralign = _w(_size); |
228 | mcsec.sh_entsize = _w(_size); |
229 | uwrite(fd_map, &mcsec, sizeof(mcsec)); |
230 | |
231 | mcsec.sh_name = w(old_shstr_sh_size); |
232 | mcsec.sh_type = (sizeof(Elf_Rela) == rel_entsize) |
233 | ? w(SHT_RELA) |
234 | : w(SHT_REL); |
235 | mcsec.sh_flags = 0; |
236 | mcsec.sh_addr = 0; |
237 | mcsec.sh_offset = _w((void *)mlocp - (void *)mloc0 + t); |
238 | mcsec.sh_size = _w((void *)mrelp - (void *)mrel0); |
239 | mcsec.sh_link = w(symsec_sh_link); |
240 | mcsec.sh_info = w(old_shnum); |
241 | mcsec.sh_addralign = _w(_size); |
242 | mcsec.sh_entsize = _w(rel_entsize); |
243 | uwrite(fd_map, &mcsec, sizeof(mcsec)); |
244 | |
245 | uwrite(fd_map, mloc0, (void *)mlocp - (void *)mloc0); |
246 | uwrite(fd_map, mrel0, (void *)mrelp - (void *)mrel0); |
247 | |
248 | ehdr->e_shoff = _w(new_e_shoff); |
249 | ehdr->e_shnum = w2(2 + w2(ehdr->e_shnum)); /* {.rel,}__mcount_loc */ |
250 | ulseek(fd_map, 0, SEEK_SET); |
251 | uwrite(fd_map, ehdr, sizeof(*ehdr)); |
252 | } |
253 | |
254 | static unsigned get_mcountsym(Elf_Sym const *const sym0, |
255 | Elf_Rel const *relp, |
256 | char const *const str0) |
257 | { |
258 | unsigned mcountsym = 0; |
259 | |
260 | Elf_Sym const *const symp = |
261 | &sym0[Elf_r_sym(relp)]; |
262 | char const *symname = &str0[w(symp->st_name)]; |
263 | char const *mcount = gpfx == '_' ? "_mcount" : "mcount"; |
264 | |
265 | if (symname[0] == '.') |
266 | ++symname; /* ppc64 hack */ |
267 | if (strcmp(mcount, symname) == 0 || |
268 | (altmcount && strcmp(altmcount, symname) == 0)) |
269 | mcountsym = Elf_r_sym(relp); |
270 | |
271 | return mcountsym; |
272 | } |
273 | |
274 | static void get_sym_str_and_relp(Elf_Shdr const *const relhdr, |
275 | Elf_Ehdr const *const ehdr, |
276 | Elf_Sym const **sym0, |
277 | char const **str0, |
278 | Elf_Rel const **relp) |
279 | { |
280 | Elf_Shdr *const shdr0 = (Elf_Shdr *)(_w(ehdr->e_shoff) |
281 | + (void *)ehdr); |
282 | unsigned const symsec_sh_link = w(relhdr->sh_link); |
283 | Elf_Shdr const *const symsec = &shdr0[symsec_sh_link]; |
284 | Elf_Shdr const *const strsec = &shdr0[w(symsec->sh_link)]; |
285 | Elf_Rel const *const rel0 = (Elf_Rel const *)(_w(relhdr->sh_offset) |
286 | + (void *)ehdr); |
287 | |
288 | *sym0 = (Elf_Sym const *)(_w(symsec->sh_offset) |
289 | + (void *)ehdr); |
290 | |
291 | *str0 = (char const *)(_w(strsec->sh_offset) |
292 | + (void *)ehdr); |
293 | |
294 | *relp = rel0; |
295 | } |
296 | |
297 | /* |
298 | * Look at the relocations in order to find the calls to mcount. |
299 | * Accumulate the section offsets that are found, and their relocation info, |
300 | * onto the end of the existing arrays. |
301 | */ |
302 | static uint_t *sift_rel_mcount(uint_t *mlocp, |
303 | unsigned const offbase, |
304 | Elf_Rel **const mrelpp, |
305 | Elf_Shdr const *const relhdr, |
306 | Elf_Ehdr const *const ehdr, |
307 | unsigned const recsym, |
308 | uint_t const recval, |
309 | unsigned const reltype) |
310 | { |
311 | uint_t *const mloc0 = mlocp; |
312 | Elf_Rel *mrelp = *mrelpp; |
313 | Elf_Sym const *sym0; |
314 | char const *str0; |
315 | Elf_Rel const *relp; |
316 | unsigned rel_entsize = _w(relhdr->sh_entsize); |
317 | unsigned const nrel = _w(relhdr->sh_size) / rel_entsize; |
318 | unsigned mcountsym = 0; |
319 | unsigned t; |
320 | |
321 | get_sym_str_and_relp(relhdr, ehdr, &sym0, &str0, &relp); |
322 | |
323 | for (t = nrel; t; --t) { |
324 | if (!mcountsym) |
325 | mcountsym = get_mcountsym(sym0, relp, str0); |
326 | |
327 | if (mcountsym == Elf_r_sym(relp) && !is_fake_mcount(relp)) { |
328 | uint_t const addend = |
329 | _w(_w(relp->r_offset) - recval + mcount_adjust); |
330 | mrelp->r_offset = _w(offbase |
331 | + ((void *)mlocp - (void *)mloc0)); |
332 | Elf_r_info(mrelp, recsym, reltype); |
333 | if (rel_entsize == sizeof(Elf_Rela)) { |
334 | ((Elf_Rela *)mrelp)->r_addend = addend; |
335 | *mlocp++ = 0; |
336 | } else |
337 | *mlocp++ = addend; |
338 | |
339 | mrelp = (Elf_Rel *)(rel_entsize + (void *)mrelp); |
340 | } |
341 | relp = (Elf_Rel const *)(rel_entsize + (void *)relp); |
342 | } |
343 | *mrelpp = mrelp; |
344 | return mlocp; |
345 | } |
346 | |
347 | /* |
348 | * Read the relocation table again, but this time its called on sections |
349 | * that are not going to be traced. The mcount calls here will be converted |
350 | * into nops. |
351 | */ |
352 | static void nop_mcount(Elf_Shdr const *const relhdr, |
353 | Elf_Ehdr const *const ehdr, |
354 | const char *const txtname) |
355 | { |
356 | Elf_Shdr *const shdr0 = (Elf_Shdr *)(_w(ehdr->e_shoff) |
357 | + (void *)ehdr); |
358 | Elf_Sym const *sym0; |
359 | char const *str0; |
360 | Elf_Rel const *relp; |
361 | Elf_Shdr const *const shdr = &shdr0[w(relhdr->sh_info)]; |
362 | unsigned rel_entsize = _w(relhdr->sh_entsize); |
363 | unsigned const nrel = _w(relhdr->sh_size) / rel_entsize; |
364 | unsigned mcountsym = 0; |
365 | unsigned t; |
366 | int once = 0; |
367 | |
368 | get_sym_str_and_relp(relhdr, ehdr, &sym0, &str0, &relp); |
369 | |
370 | for (t = nrel; t; --t) { |
371 | int ret = -1; |
372 | |
373 | if (!mcountsym) |
374 | mcountsym = get_mcountsym(sym0, relp, str0); |
375 | |
376 | if (mcountsym == Elf_r_sym(relp) && !is_fake_mcount(relp)) { |
377 | if (make_nop) |
378 | ret = make_nop((void *)ehdr, shdr->sh_offset + relp->r_offset); |
379 | if (warn_on_notrace_sect && !once) { |
380 | printf("Section %s has mcount callers being ignored\n", |
381 | txtname); |
382 | once = 1; |
383 | /* just warn? */ |
384 | if (!make_nop) |
385 | return; |
386 | } |
387 | } |
388 | |
389 | /* |
390 | * If we successfully removed the mcount, mark the relocation |
391 | * as a nop (don't do anything with it). |
392 | */ |
393 | if (!ret) { |
394 | Elf_Rel rel; |
395 | rel = *(Elf_Rel *)relp; |
396 | Elf_r_info(&rel, Elf_r_sym(relp), rel_type_nop); |
397 | ulseek(fd_map, (void *)relp - (void *)ehdr, SEEK_SET); |
398 | uwrite(fd_map, &rel, sizeof(rel)); |
399 | } |
400 | relp = (Elf_Rel const *)(rel_entsize + (void *)relp); |
401 | } |
402 | } |
403 | |
404 | |
405 | /* |
406 | * Find a symbol in the given section, to be used as the base for relocating |
407 | * the table of offsets of calls to mcount. A local or global symbol suffices, |
408 | * but avoid a Weak symbol because it may be overridden; the change in value |
409 | * would invalidate the relocations of the offsets of the calls to mcount. |
410 | * Often the found symbol will be the unnamed local symbol generated by |
411 | * GNU 'as' for the start of each section. For example: |
412 | * Num: Value Size Type Bind Vis Ndx Name |
413 | * 2: 00000000 0 SECTION LOCAL DEFAULT 1 |
414 | */ |
415 | static unsigned find_secsym_ndx(unsigned const txtndx, |
416 | char const *const txtname, |
417 | uint_t *const recvalp, |
418 | Elf_Shdr const *const symhdr, |
419 | Elf_Ehdr const *const ehdr) |
420 | { |
421 | Elf_Sym const *const sym0 = (Elf_Sym const *)(_w(symhdr->sh_offset) |
422 | + (void *)ehdr); |
423 | unsigned const nsym = _w(symhdr->sh_size) / _w(symhdr->sh_entsize); |
424 | Elf_Sym const *symp; |
425 | unsigned t; |
426 | |
427 | for (symp = sym0, t = nsym; t; --t, ++symp) { |
428 | unsigned int const st_bind = ELF_ST_BIND(symp->st_info); |
429 | |
430 | if (txtndx == w2(symp->st_shndx) |
431 | /* avoid STB_WEAK */ |
432 | && (STB_LOCAL == st_bind || STB_GLOBAL == st_bind)) { |
433 | /* function symbols on ARM have quirks, avoid them */ |
434 | if (w2(ehdr->e_machine) == EM_ARM |
435 | && ELF_ST_TYPE(symp->st_info) == STT_FUNC) |
436 | continue; |
437 | |
438 | *recvalp = _w(symp->st_value); |
439 | return symp - sym0; |
440 | } |
441 | } |
442 | fprintf(stderr, "Cannot find symbol for section %d: %s.\n", |
443 | txtndx, txtname); |
444 | fail_file(); |
445 | } |
446 | |
447 | |
448 | /* Evade ISO C restriction: no declaration after statement in has_rel_mcount. */ |
449 | static char const * |
450 | __has_rel_mcount(Elf_Shdr const *const relhdr, /* is SHT_REL or SHT_RELA */ |
451 | Elf_Shdr const *const shdr0, |
452 | char const *const shstrtab, |
453 | char const *const fname) |
454 | { |
455 | /* .sh_info depends on .sh_type == SHT_REL[,A] */ |
456 | Elf_Shdr const *const txthdr = &shdr0[w(relhdr->sh_info)]; |
457 | char const *const txtname = &shstrtab[w(txthdr->sh_name)]; |
458 | |
459 | if (strcmp("__mcount_loc", txtname) == 0) { |
460 | fprintf(stderr, "warning: __mcount_loc already exists: %s\n", |
461 | fname); |
462 | succeed_file(); |
463 | } |
464 | if (w(txthdr->sh_type) != SHT_PROGBITS || |
465 | !(_w(txthdr->sh_flags) & SHF_EXECINSTR)) |
466 | return NULL; |
467 | return txtname; |
468 | } |
469 | |
470 | static char const *has_rel_mcount(Elf_Shdr const *const relhdr, |
471 | Elf_Shdr const *const shdr0, |
472 | char const *const shstrtab, |
473 | char const *const fname) |
474 | { |
475 | if (w(relhdr->sh_type) != SHT_REL && w(relhdr->sh_type) != SHT_RELA) |
476 | return NULL; |
477 | return __has_rel_mcount(relhdr, shdr0, shstrtab, fname); |
478 | } |
479 | |
480 | |
481 | static unsigned tot_relsize(Elf_Shdr const *const shdr0, |
482 | unsigned nhdr, |
483 | const char *const shstrtab, |
484 | const char *const fname) |
485 | { |
486 | unsigned totrelsz = 0; |
487 | Elf_Shdr const *shdrp = shdr0; |
488 | char const *txtname; |
489 | |
490 | for (; nhdr; --nhdr, ++shdrp) { |
491 | txtname = has_rel_mcount(shdrp, shdr0, shstrtab, fname); |
492 | if (txtname && is_mcounted_section_name(txtname)) |
493 | totrelsz += _w(shdrp->sh_size); |
494 | } |
495 | return totrelsz; |
496 | } |
497 | |
498 | |
499 | /* Overall supervision for Elf32 ET_REL file. */ |
500 | static void |
501 | do_func(Elf_Ehdr *const ehdr, char const *const fname, unsigned const reltype) |
502 | { |
503 | Elf_Shdr *const shdr0 = (Elf_Shdr *)(_w(ehdr->e_shoff) |
504 | + (void *)ehdr); |
505 | unsigned const nhdr = w2(ehdr->e_shnum); |
506 | Elf_Shdr *const shstr = &shdr0[w2(ehdr->e_shstrndx)]; |
507 | char const *const shstrtab = (char const *)(_w(shstr->sh_offset) |
508 | + (void *)ehdr); |
509 | |
510 | Elf_Shdr const *relhdr; |
511 | unsigned k; |
512 | |
513 | /* Upper bound on space: assume all relevant relocs are for mcount. */ |
514 | unsigned const totrelsz = tot_relsize(shdr0, nhdr, shstrtab, fname); |
515 | Elf_Rel *const mrel0 = umalloc(totrelsz); |
516 | Elf_Rel * mrelp = mrel0; |
517 | |
518 | /* 2*sizeof(address) <= sizeof(Elf_Rel) */ |
519 | uint_t *const mloc0 = umalloc(totrelsz>>1); |
520 | uint_t * mlocp = mloc0; |
521 | |
522 | unsigned rel_entsize = 0; |
523 | unsigned symsec_sh_link = 0; |
524 | |
525 | for (relhdr = shdr0, k = nhdr; k; --k, ++relhdr) { |
526 | char const *const txtname = has_rel_mcount(relhdr, shdr0, |
527 | shstrtab, fname); |
528 | if (txtname && is_mcounted_section_name(txtname)) { |
529 | uint_t recval = 0; |
530 | unsigned const recsym = find_secsym_ndx( |
531 | w(relhdr->sh_info), txtname, &recval, |
532 | &shdr0[symsec_sh_link = w(relhdr->sh_link)], |
533 | ehdr); |
534 | |
535 | rel_entsize = _w(relhdr->sh_entsize); |
536 | mlocp = sift_rel_mcount(mlocp, |
537 | (void *)mlocp - (void *)mloc0, &mrelp, |
538 | relhdr, ehdr, recsym, recval, reltype); |
539 | } else if (txtname && (warn_on_notrace_sect || make_nop)) { |
540 | /* |
541 | * This section is ignored by ftrace, but still |
542 | * has mcount calls. Convert them to nops now. |
543 | */ |
544 | nop_mcount(relhdr, ehdr, txtname); |
545 | } |
546 | } |
547 | if (mloc0 != mlocp) { |
548 | append_func(ehdr, shstr, mloc0, mlocp, mrel0, mrelp, |
549 | rel_entsize, symsec_sh_link); |
550 | } |
551 | free(mrel0); |
552 | free(mloc0); |
553 | } |
554 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
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jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
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jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9