linux/scripts/recordmcount.h
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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. */
 123static int fn_is_fake_mcount(Elf_Rel const *rp)
 124{
 125        return 0;
 126}
 127static int (*is_fake_mcount)(Elf_Rel const *rp) = fn_is_fake_mcount;
 128
 129static uint_t fn_ELF_R_SYM(Elf_Rel const *rp)
 130{
 131        return ELF_R_SYM(_w(rp->r_info));
 132}
 133static uint_t (*Elf_r_sym)(Elf_Rel const *rp) = fn_ELF_R_SYM;
 134
 135static 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}
 139static void (*Elf_r_info)(Elf_Rel *const rp, unsigned sym, unsigned type) = fn_ELF_R_INFO;
 140
 141static 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
 164static 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. */
 178static 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
 254static 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
 274static 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 */
 302static 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 */
 352static 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 */
 415static 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. */
 449static 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
 470static 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
 481static 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. */
 500static void
 501do_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
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