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        char const *fentry = "__fentry__";
 265
 266        if (symname[0] == '.')
 267                ++symname;  /* ppc64 hack */
 268        if (strcmp(mcount, symname) == 0 ||
 269            (altmcount && strcmp(altmcount, symname) == 0) ||
 270            (strcmp(fentry, symname) == 0))
 271                mcountsym = Elf_r_sym(relp);
 272
 273        return mcountsym;
 274}
 275
 276static void get_sym_str_and_relp(Elf_Shdr const *const relhdr,
 277                                 Elf_Ehdr const *const ehdr,
 278                                 Elf_Sym const **sym0,
 279                                 char const **str0,
 280                                 Elf_Rel const **relp)
 281{
 282        Elf_Shdr *const shdr0 = (Elf_Shdr *)(_w(ehdr->e_shoff)
 283                + (void *)ehdr);
 284        unsigned const symsec_sh_link = w(relhdr->sh_link);
 285        Elf_Shdr const *const symsec = &shdr0[symsec_sh_link];
 286        Elf_Shdr const *const strsec = &shdr0[w(symsec->sh_link)];
 287        Elf_Rel const *const rel0 = (Elf_Rel const *)(_w(relhdr->sh_offset)
 288                + (void *)ehdr);
 289
 290        *sym0 = (Elf_Sym const *)(_w(symsec->sh_offset)
 291                                  + (void *)ehdr);
 292
 293        *str0 = (char const *)(_w(strsec->sh_offset)
 294                               + (void *)ehdr);
 295
 296        *relp = rel0;
 297}
 298
 299/*
 300 * Look at the relocations in order to find the calls to mcount.
 301 * Accumulate the section offsets that are found, and their relocation info,
 302 * onto the end of the existing arrays.
 303 */
 304static uint_t *sift_rel_mcount(uint_t *mlocp,
 305                               unsigned const offbase,
 306                               Elf_Rel **const mrelpp,
 307                               Elf_Shdr const *const relhdr,
 308                               Elf_Ehdr const *const ehdr,
 309                               unsigned const recsym,
 310                               uint_t const recval,
 311                               unsigned const reltype)
 312{
 313        uint_t *const mloc0 = mlocp;
 314        Elf_Rel *mrelp = *mrelpp;
 315        Elf_Sym const *sym0;
 316        char const *str0;
 317        Elf_Rel const *relp;
 318        unsigned rel_entsize = _w(relhdr->sh_entsize);
 319        unsigned const nrel = _w(relhdr->sh_size) / rel_entsize;
 320        unsigned mcountsym = 0;
 321        unsigned t;
 322
 323        get_sym_str_and_relp(relhdr, ehdr, &sym0, &str0, &relp);
 324
 325        for (t = nrel; t; --t) {
 326                if (!mcountsym)
 327                        mcountsym = get_mcountsym(sym0, relp, str0);
 328
 329                if (mcountsym == Elf_r_sym(relp) && !is_fake_mcount(relp)) {
 330                        uint_t const addend =
 331                                _w(_w(relp->r_offset) - recval + mcount_adjust);
 332                        mrelp->r_offset = _w(offbase
 333                                + ((void *)mlocp - (void *)mloc0));
 334                        Elf_r_info(mrelp, recsym, reltype);
 335                        if (rel_entsize == sizeof(Elf_Rela)) {
 336                                ((Elf_Rela *)mrelp)->r_addend = addend;
 337                                *mlocp++ = 0;
 338                        } else
 339                                *mlocp++ = addend;
 340
 341                        mrelp = (Elf_Rel *)(rel_entsize + (void *)mrelp);
 342                }
 343                relp = (Elf_Rel const *)(rel_entsize + (void *)relp);
 344        }
 345        *mrelpp = mrelp;
 346        return mlocp;
 347}
 348
 349/*
 350 * Read the relocation table again, but this time its called on sections
 351 * that are not going to be traced. The mcount calls here will be converted
 352 * into nops.
 353 */
 354static void nop_mcount(Elf_Shdr const *const relhdr,
 355                       Elf_Ehdr const *const ehdr,
 356                       const char *const txtname)
 357{
 358        Elf_Shdr *const shdr0 = (Elf_Shdr *)(_w(ehdr->e_shoff)
 359                + (void *)ehdr);
 360        Elf_Sym const *sym0;
 361        char const *str0;
 362        Elf_Rel const *relp;
 363        Elf_Shdr const *const shdr = &shdr0[w(relhdr->sh_info)];
 364        unsigned rel_entsize = _w(relhdr->sh_entsize);
 365        unsigned const nrel = _w(relhdr->sh_size) / rel_entsize;
 366        unsigned mcountsym = 0;
 367        unsigned t;
 368        int once = 0;
 369
 370        get_sym_str_and_relp(relhdr, ehdr, &sym0, &str0, &relp);
 371
 372        for (t = nrel; t; --t) {
 373                int ret = -1;
 374
 375                if (!mcountsym)
 376                        mcountsym = get_mcountsym(sym0, relp, str0);
 377
 378                if (mcountsym == Elf_r_sym(relp) && !is_fake_mcount(relp)) {
 379                        if (make_nop)
 380                                ret = make_nop((void *)ehdr, shdr->sh_offset + relp->r_offset);
 381                        if (warn_on_notrace_sect && !once) {
 382                                printf("Section %s has mcount callers being ignored\n",
 383                                       txtname);
 384                                once = 1;
 385                                /* just warn? */
 386                                if (!make_nop)
 387                                        return;
 388                        }
 389                }
 390
 391                /*
 392                 * If we successfully removed the mcount, mark the relocation
 393                 * as a nop (don't do anything with it).
 394                 */
 395                if (!ret) {
 396                        Elf_Rel rel;
 397                        rel = *(Elf_Rel *)relp;
 398                        Elf_r_info(&rel, Elf_r_sym(relp), rel_type_nop);
 399                        ulseek(fd_map, (void *)relp - (void *)ehdr, SEEK_SET);
 400                        uwrite(fd_map, &rel, sizeof(rel));
 401                }
 402                relp = (Elf_Rel const *)(rel_entsize + (void *)relp);
 403        }
 404}
 405
 406
 407/*
 408 * Find a symbol in the given section, to be used as the base for relocating
 409 * the table of offsets of calls to mcount.  A local or global symbol suffices,
 410 * but avoid a Weak symbol because it may be overridden; the change in value
 411 * would invalidate the relocations of the offsets of the calls to mcount.
 412 * Often the found symbol will be the unnamed local symbol generated by
 413 * GNU 'as' for the start of each section.  For example:
 414 *    Num:    Value  Size Type    Bind   Vis      Ndx Name
 415 *      2: 00000000     0 SECTION LOCAL  DEFAULT    1
 416 */
 417static unsigned find_secsym_ndx(unsigned const txtndx,
 418                                char const *const txtname,
 419                                uint_t *const recvalp,
 420                                Elf_Shdr const *const symhdr,
 421                                Elf_Ehdr const *const ehdr)
 422{
 423        Elf_Sym const *const sym0 = (Elf_Sym const *)(_w(symhdr->sh_offset)
 424                + (void *)ehdr);
 425        unsigned const nsym = _w(symhdr->sh_size) / _w(symhdr->sh_entsize);
 426        Elf_Sym const *symp;
 427        unsigned t;
 428
 429        for (symp = sym0, t = nsym; t; --t, ++symp) {
 430                unsigned int const st_bind = ELF_ST_BIND(symp->st_info);
 431
 432                if (txtndx == w2(symp->st_shndx)
 433                        /* avoid STB_WEAK */
 434                    && (STB_LOCAL == st_bind || STB_GLOBAL == st_bind)) {
 435                        /* function symbols on ARM have quirks, avoid them */
 436                        if (w2(ehdr->e_machine) == EM_ARM
 437                            && ELF_ST_TYPE(symp->st_info) == STT_FUNC)
 438                                continue;
 439
 440                        *recvalp = _w(symp->st_value);
 441                        return symp - sym0;
 442                }
 443        }
 444        fprintf(stderr, "Cannot find symbol for section %d: %s.\n",
 445                txtndx, txtname);
 446        fail_file();
 447}
 448
 449
 450/* Evade ISO C restriction: no declaration after statement in has_rel_mcount. */
 451static char const *
 452__has_rel_mcount(Elf_Shdr const *const relhdr,  /* is SHT_REL or SHT_RELA */
 453                 Elf_Shdr const *const shdr0,
 454                 char const *const shstrtab,
 455                 char const *const fname)
 456{
 457        /* .sh_info depends on .sh_type == SHT_REL[,A] */
 458        Elf_Shdr const *const txthdr = &shdr0[w(relhdr->sh_info)];
 459        char const *const txtname = &shstrtab[w(txthdr->sh_name)];
 460
 461        if (strcmp("__mcount_loc", txtname) == 0) {
 462                fprintf(stderr, "warning: __mcount_loc already exists: %s\n",
 463                        fname);
 464                succeed_file();
 465        }
 466        if (w(txthdr->sh_type) != SHT_PROGBITS ||
 467            !(_w(txthdr->sh_flags) & SHF_EXECINSTR))
 468                return NULL;
 469        return txtname;
 470}
 471
 472static char const *has_rel_mcount(Elf_Shdr const *const relhdr,
 473                                  Elf_Shdr const *const shdr0,
 474                                  char const *const shstrtab,
 475                                  char const *const fname)
 476{
 477        if (w(relhdr->sh_type) != SHT_REL && w(relhdr->sh_type) != SHT_RELA)
 478                return NULL;
 479        return __has_rel_mcount(relhdr, shdr0, shstrtab, fname);
 480}
 481
 482
 483static unsigned tot_relsize(Elf_Shdr const *const shdr0,
 484                            unsigned nhdr,
 485                            const char *const shstrtab,
 486                            const char *const fname)
 487{
 488        unsigned totrelsz = 0;
 489        Elf_Shdr const *shdrp = shdr0;
 490        char const *txtname;
 491
 492        for (; nhdr; --nhdr, ++shdrp) {
 493                txtname = has_rel_mcount(shdrp, shdr0, shstrtab, fname);
 494                if (txtname && is_mcounted_section_name(txtname))
 495                        totrelsz += _w(shdrp->sh_size);
 496        }
 497        return totrelsz;
 498}
 499
 500
 501/* Overall supervision for Elf32 ET_REL file. */
 502static void
 503do_func(Elf_Ehdr *const ehdr, char const *const fname, unsigned const reltype)
 504{
 505        Elf_Shdr *const shdr0 = (Elf_Shdr *)(_w(ehdr->e_shoff)
 506                + (void *)ehdr);
 507        unsigned const nhdr = w2(ehdr->e_shnum);
 508        Elf_Shdr *const shstr = &shdr0[w2(ehdr->e_shstrndx)];
 509        char const *const shstrtab = (char const *)(_w(shstr->sh_offset)
 510                + (void *)ehdr);
 511
 512        Elf_Shdr const *relhdr;
 513        unsigned k;
 514
 515        /* Upper bound on space: assume all relevant relocs are for mcount. */
 516        unsigned const totrelsz = tot_relsize(shdr0, nhdr, shstrtab, fname);
 517        Elf_Rel *const mrel0 = umalloc(totrelsz);
 518        Elf_Rel *      mrelp = mrel0;
 519
 520        /* 2*sizeof(address) <= sizeof(Elf_Rel) */
 521        uint_t *const mloc0 = umalloc(totrelsz>>1);
 522        uint_t *      mlocp = mloc0;
 523
 524        unsigned rel_entsize = 0;
 525        unsigned symsec_sh_link = 0;
 526
 527        for (relhdr = shdr0, k = nhdr; k; --k, ++relhdr) {
 528                char const *const txtname = has_rel_mcount(relhdr, shdr0,
 529                        shstrtab, fname);
 530                if (txtname && is_mcounted_section_name(txtname)) {
 531                        uint_t recval = 0;
 532                        unsigned const recsym = find_secsym_ndx(
 533                                w(relhdr->sh_info), txtname, &recval,
 534                                &shdr0[symsec_sh_link = w(relhdr->sh_link)],
 535                                ehdr);
 536
 537                        rel_entsize = _w(relhdr->sh_entsize);
 538                        mlocp = sift_rel_mcount(mlocp,
 539                                (void *)mlocp - (void *)mloc0, &mrelp,
 540                                relhdr, ehdr, recsym, recval, reltype);
 541                } else if (txtname && (warn_on_notrace_sect || make_nop)) {
 542                        /*
 543                         * This section is ignored by ftrace, but still
 544                         * has mcount calls. Convert them to nops now.
 545                         */
 546                        nop_mcount(relhdr, ehdr, txtname);
 547                }
 548        }
 549        if (mloc0 != mlocp) {
 550                append_func(ehdr, shstr, mloc0, mlocp, mrel0, mrelp,
 551                            rel_entsize, symsec_sh_link);
 552        }
 553        free(mrel0);
 554        free(mloc0);
 555}
 556
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