Quelle recordmcount.h Sprache: C

/* SPDX-License-Identifier: GPL-2.0-only */
/*
* recordmcount.h
*
* This code was taken out of recordmcount.c written by
* Copyright 2009 John F. Reiser <jreiser@BitWagon.com>.  All rights reserved.
*
* The original code had the same algorithms for both 32bit
* and 64bit ELF files, but the code was duplicated to support
* the difference in structures that were used. This
* file creates a macro of everything that is different between
* the 64 and 32 bit code, such that by including this header
* twice we can create both sets of functions by including this
* header once with RECORD_MCOUNT_64 undefined, and again with
* it defined.
*
* This conversion to macros was done by:
* Copyright 2010 Steven Rostedt <srostedt@redhat.com>, Red Hat Inc.
*/
#undef append_func
#undef is_fake_mcount
#undef fn_is_fake_mcount
#undef MIPS_is_fake_mcount
#undef mcount_adjust
#undef sift_rel_mcount
#undef nop_mcount
#undef find_secsym_ndx
#undef __has_rel_mcount
#undef has_rel_mcount
#undef tot_relsize
#undef get_mcountsym
#undef find_symtab
#undef get_shnum
#undef set_shnum
#undef get_shstrndx
#undef get_symindex
#undef get_sym_str_and_relp
#undef do_func
#undef Elf_Addr
#undef Elf_Ehdr
#undef Elf_Shdr
#undef Elf_Rel
#undef Elf_Rela
#undef Elf_Sym
#undef ELF_R_SYM
#undef Elf_r_sym
#undef ELF_R_INFO
#undef Elf_r_info
#undef ELF_ST_BIND
#undef ELF_ST_TYPE
#undef fn_ELF_R_SYM
#undef fn_ELF_R_INFO
#undef uint_t
#undef _w
#undef _align
#undef _size

#ifdef RECORD_MCOUNT_64
# define append_func  append64
# define sift_rel_mcount sift64_rel_mcount
# define nop_mcount  nop_mcount_64
# define find_secsym_ndx find64_secsym_ndx
# define __has_rel_mcount __has64_rel_mcount
# define has_rel_mcount  has64_rel_mcount
# define tot_relsize  tot64_relsize
# define find_symtab  find_symtab64
# define get_shnum  get_shnum64
# define set_shnum  set_shnum64
# define get_shstrndx  get_shstrndx64
# define get_symindex  get_symindex64
# define get_sym_str_and_relp get_sym_str_and_relp_64
# define do_func  do64
# define get_mcountsym  get_mcountsym_64
# define is_fake_mcount  is_fake_mcount64
# define fn_is_fake_mcount fn_is_fake_mcount64
# define MIPS_is_fake_mcount MIPS64_is_fake_mcount
# define mcount_adjust  mcount_adjust_64
# define Elf_Addr  Elf64_Addr
# define Elf_Ehdr  Elf64_Ehdr
# define Elf_Shdr  Elf64_Shdr
# define Elf_Rel  Elf64_Rel
# define Elf_Rela  Elf64_Rela
# define Elf_Sym  Elf64_Sym
# define ELF_R_SYM  ELF64_R_SYM
# define Elf_r_sym  Elf64_r_sym
# define ELF_R_INFO  ELF64_R_INFO
# define Elf_r_info  Elf64_r_info
# define ELF_ST_BIND  ELF64_ST_BIND
# define ELF_ST_TYPE  ELF64_ST_TYPE
# define fn_ELF_R_SYM  fn_ELF64_R_SYM
# define fn_ELF_R_INFO  fn_ELF64_R_INFO
# define uint_t   uint64_t
# define _w   w8
# define _align   7u
# define _size   8
#else
# define append_func  append32
# define sift_rel_mcount sift32_rel_mcount
# define nop_mcount  nop_mcount_32
# define find_secsym_ndx find32_secsym_ndx
# define __has_rel_mcount __has32_rel_mcount
# define has_rel_mcount  has32_rel_mcount
# define tot_relsize  tot32_relsize
# define find_symtab  find_symtab32
# define get_shnum  get_shnum32
# define set_shnum  set_shnum32
# define get_shstrndx  get_shstrndx32
# define get_symindex  get_symindex32
# define get_sym_str_and_relp get_sym_str_and_relp_32
# define do_func  do32
# define get_mcountsym  get_mcountsym_32
# define is_fake_mcount  is_fake_mcount32
# define fn_is_fake_mcount fn_is_fake_mcount32
# define MIPS_is_fake_mcount MIPS32_is_fake_mcount
# define mcount_adjust  mcount_adjust_32
# define Elf_Addr  Elf32_Addr
# define Elf_Ehdr  Elf32_Ehdr
# define Elf_Shdr  Elf32_Shdr
# define Elf_Rel  Elf32_Rel
# define Elf_Rela  Elf32_Rela
# define Elf_Sym  Elf32_Sym
# define ELF_R_SYM  ELF32_R_SYM
# define Elf_r_sym  Elf32_r_sym
# define ELF_R_INFO  ELF32_R_INFO
# define Elf_r_info  Elf32_r_info
# define ELF_ST_BIND  ELF32_ST_BIND
# define ELF_ST_TYPE  ELF32_ST_TYPE
# define fn_ELF_R_SYM  fn_ELF32_R_SYM
# define fn_ELF_R_INFO  fn_ELF32_R_INFO
# define uint_t   uint32_t
# define _w   w
# define _align   3u
# define _size   4
#endif

/* Functions and pointers that do_file() may override for specific e_machine. */
static int fn_is_fake_mcount(Elf_Rel const *rp)
{
return 0;
}
static int (*is_fake_mcount)(Elf_Rel const *rp) = fn_is_fake_mcount;

static uint_t fn_ELF_R_SYM(Elf_Rel const *rp)
{
return ELF_R_SYM(_w(rp->r_info));
}
static uint_t (*Elf_r_sym)(Elf_Rel const *rp) = fn_ELF_R_SYM;

static void fn_ELF_R_INFO(Elf_Rel *const rp, unsigned sym, unsigned type)
{
rp->r_info = _w(ELF_R_INFO(sym, type));
}
static void (*Elf_r_info)(Elf_Rel *const rp, unsigned sym, unsigned type) = fn_ELF_R_INFO;

static int mcount_adjust = 0;

/*
* MIPS mcount long call has 2 _mcount symbols, only the position of the 1st
* _mcount symbol is needed for dynamic function tracer, with it, to disable
* tracing(ftrace_make_nop), the instruction in the position is replaced with
* the "b label" instruction, to enable tracing(ftrace_make_call), replace the
* instruction back. So, here, we set the 2nd one as fake and filter it.
*
* c: 3c030000 lui v1,0x0 <--> b label
* c: R_MIPS_HI16 _mcount
* c: R_MIPS_NONE *ABS*
* c: R_MIPS_NONE *ABS*
* 10: 64630000 daddiu v1,v1,0
* 10: R_MIPS_LO16 _mcount
* 10: R_MIPS_NONE *ABS*
* 10: R_MIPS_NONE *ABS*
* 14: 03e0082d move at,ra
* 18: 0060f809 jalr v1
* label:
*/
#define MIPS_FAKEMCOUNT_OFFSET 4

static int MIPS_is_fake_mcount(Elf_Rel const *rp)
{
static Elf_Addr old_r_offset = ~(Elf_Addr)0;
Elf_Addr current_r_offset = _w(rp->r_offset);
int is_fake;

is_fake = (old_r_offset != ~(Elf_Addr)0) &&
  (current_r_offset - old_r_offset == MIPS_FAKEMCOUNT_OFFSET);
old_r_offset = current_r_offset;

return is_fake;
}

static unsigned int get_symindex(Elf_Sym const *sym, Elf32_Word const *symtab,
     Elf32_Word const *symtab_shndx)
{
unsigned long offset;
unsigned short shndx = w2(sym->st_shndx);
int index;

if (shndx > SHN_UNDEF && shndx < SHN_LORESERVE)
  return shndx;

if (shndx == SHN_XINDEX) {
  offset = (unsigned long)sym - (unsigned long)symtab;
  index = offset / sizeof(*sym);

  return w(symtab_shndx[index]);
}

return 0;
}

static unsigned int get_shnum(Elf_Ehdr const *ehdr, Elf_Shdr const *shdr0)
{
if (shdr0 && !ehdr->e_shnum)
  return w(shdr0->sh_size);

return w2(ehdr->e_shnum);
}

static void set_shnum(Elf_Ehdr *ehdr, Elf_Shdr *shdr0, unsigned int new_shnum)
{
if (new_shnum >= SHN_LORESERVE) {
  ehdr->e_shnum = 0;
  shdr0->sh_size = w(new_shnum);
} else
  ehdr->e_shnum = w2(new_shnum);
}

static int get_shstrndx(Elf_Ehdr const *ehdr, Elf_Shdr const *shdr0)
{
if (ehdr->e_shstrndx != SHN_XINDEX)
  return w2(ehdr->e_shstrndx);

return w(shdr0->sh_link);
}

static void find_symtab(Elf_Ehdr *const ehdr, Elf_Shdr const *shdr0,
   unsigned const nhdr, Elf32_Word **symtab,
   Elf32_Word **symtab_shndx)
{
Elf_Shdr const *relhdr;
unsigned k;

*symtab = NULL;
*symtab_shndx = NULL;

for (relhdr = shdr0, k = nhdr; k; --k, ++relhdr) {
  if (relhdr->sh_type == SHT_SYMTAB)
   *symtab = (void *)ehdr + relhdr->sh_offset;
  else if (relhdr->sh_type == SHT_SYMTAB_SHNDX)
   *symtab_shndx = (void *)ehdr + relhdr->sh_offset;

  if (*symtab && *symtab_shndx)
   break;
}
}

/* Append the new shstrtab, Elf_Shdr[], __mcount_loc and its relocations. */
static int append_func(Elf_Ehdr *const ehdr,
   Elf_Shdr *const shstr,
   uint_t const *const mloc0,
   uint_t const *const mlocp,
   Elf_Rel const *const mrel0,
   Elf_Rel const *const mrelp,
   unsigned int const rel_entsize,
   unsigned int const symsec_sh_link)
{
/* Begin constructing output file */
Elf_Shdr mcsec;
char const *mc_name = (sizeof(Elf_Rela) == rel_entsize)
  ? ".rela__mcount_loc"
  :  ".rel__mcount_loc";
uint_t const old_shoff = _w(ehdr->e_shoff);
uint_t const old_shstr_sh_size   = _w(shstr->sh_size);
uint_t const old_shstr_sh_offset = _w(shstr->sh_offset);
Elf_Shdr *const shdr0 = (Elf_Shdr *)(old_shoff + (void *)ehdr);
unsigned int const old_shnum = get_shnum(ehdr, shdr0);
unsigned int const new_shnum = 2 + old_shnum; /* {.rel,}__mcount_loc */
uint_t t = 1 + strlen(mc_name) + _w(shstr->sh_size);
uint_t new_e_shoff;

shstr->sh_size = _w(t);
shstr->sh_offset = _w(sb.st_size);
t += sb.st_size;
t += (_align & -t);  /* word-byte align */
new_e_shoff = t;

set_shnum(ehdr, shdr0, new_shnum);

/* body for new shstrtab */
if (ulseek(sb.st_size, SEEK_SET) < 0)
  return -1;
if (uwrite(old_shstr_sh_offset + (void *)ehdr, old_shstr_sh_size) < 0)
  return -1;
if (uwrite(mc_name, 1 + strlen(mc_name)) < 0)
  return -1;

/* old(modified) Elf_Shdr table, word-byte aligned */
if (ulseek(t, SEEK_SET) < 0)
  return -1;
t += sizeof(Elf_Shdr) * old_shnum;
if (uwrite(old_shoff + (void *)ehdr,
        sizeof(Elf_Shdr) * old_shnum) < 0)
  return -1;

/* new sections __mcount_loc and .rel__mcount_loc */
t += 2*sizeof(mcsec);
mcsec.sh_name = w((sizeof(Elf_Rela) == rel_entsize) + strlen(".rel")
  + old_shstr_sh_size);
mcsec.sh_type = w(SHT_PROGBITS);
mcsec.sh_flags = _w(SHF_ALLOC);
mcsec.sh_addr = 0;
mcsec.sh_offset = _w(t);
mcsec.sh_size = _w((void *)mlocp - (void *)mloc0);
mcsec.sh_link = 0;
mcsec.sh_info = 0;
mcsec.sh_addralign = _w(_size);
mcsec.sh_entsize = _w(_size);
if (uwrite(&mcsec, sizeof(mcsec)) < 0)
  return -1;

mcsec.sh_name = w(old_shstr_sh_size);
mcsec.sh_type = (sizeof(Elf_Rela) == rel_entsize)
  ? w(SHT_RELA)
  : w(SHT_REL);
mcsec.sh_flags = 0;
mcsec.sh_addr = 0;
mcsec.sh_offset = _w((void *)mlocp - (void *)mloc0 + t);
mcsec.sh_size   = _w((void *)mrelp - (void *)mrel0);
mcsec.sh_link = w(symsec_sh_link);
mcsec.sh_info = w(old_shnum);
mcsec.sh_addralign = _w(_size);
mcsec.sh_entsize = _w(rel_entsize);

if (uwrite(&mcsec, sizeof(mcsec)) < 0)
  return -1;

if (uwrite(mloc0, (void *)mlocp - (void *)mloc0) < 0)
  return -1;
if (uwrite(mrel0, (void *)mrelp - (void *)mrel0) < 0)
  return -1;

ehdr->e_shoff = _w(new_e_shoff);
if (ulseek(0, SEEK_SET) < 0)
  return -1;
if (uwrite(ehdr, sizeof(*ehdr)) < 0)
  return -1;
return 0;
}

static unsigned get_mcountsym(Elf_Sym const *const sym0,
         Elf_Rel const *relp,
         char const *const str0)
{
unsigned mcountsym = 0;

Elf_Sym const *const symp =
  &sym0[Elf_r_sym(relp)];
char const *symname = &str0[w(symp->st_name)];
char const *mcount = gpfx == '_' ? "_mcount" : "mcount";
char const *fentry = "__fentry__";

if (symname[0] == '.')
  ++symname;  /* ppc64 hack */
if (strcmp(mcount, symname) == 0 ||
     (altmcount && strcmp(altmcount, symname) == 0) ||
     (strcmp(fentry, symname) == 0))
  mcountsym = Elf_r_sym(relp);

return mcountsym;
}

static void get_sym_str_and_relp(Elf_Shdr const *const relhdr,
     Elf_Ehdr const *const ehdr,
     Elf_Sym const **sym0,
     char const **str0,
     Elf_Rel const **relp)
{
Elf_Shdr *const shdr0 = (Elf_Shdr *)(_w(ehdr->e_shoff)
  + (void *)ehdr);
unsigned const symsec_sh_link = w(relhdr->sh_link);
Elf_Shdr const *const symsec = &shdr0[symsec_sh_link];
Elf_Shdr const *const strsec = &shdr0[w(symsec->sh_link)];
Elf_Rel const *const rel0 = (Elf_Rel const *)(_w(relhdr->sh_offset)
  + (void *)ehdr);

*sym0 = (Elf_Sym const *)(_w(symsec->sh_offset)
      + (void *)ehdr);

*str0 = (char const *)(_w(strsec->sh_offset)
          + (void *)ehdr);

*relp = rel0;
}

/*
* Look at the relocations in order to find the calls to mcount.
* Accumulate the section offsets that are found, and their relocation info,
* onto the end of the existing arrays.
*/
static uint_t *sift_rel_mcount(uint_t *mlocp,
          unsigned const offbase,
          Elf_Rel **const mrelpp,
          Elf_Shdr const *const relhdr,
          Elf_Ehdr const *const ehdr,
          unsigned const recsym,
          uint_t const recval,
          unsigned const reltype)
{
uint_t *const mloc0 = mlocp;
Elf_Rel *mrelp = *mrelpp;
Elf_Sym const *sym0;
char const *str0;
Elf_Rel const *relp;
unsigned rel_entsize = _w(relhdr->sh_entsize);
unsigned const nrel = _w(relhdr->sh_size) / rel_entsize;
unsigned mcountsym = 0;
unsigned t;

get_sym_str_and_relp(relhdr, ehdr, &sym0, &str0, &relp);

for (t = nrel; t; --t) {
  if (!mcountsym)
   mcountsym = get_mcountsym(sym0, relp, str0);

  if (mcountsym && mcountsym == Elf_r_sym(relp) &&
    !is_fake_mcount(relp)) {
   uint_t const addend =
    _w(_w(relp->r_offset) - recval + mcount_adjust);
   mrelp->r_offset = _w(offbase
    + ((void *)mlocp - (void *)mloc0));
   Elf_r_info(mrelp, recsym, reltype);
   if (rel_entsize == sizeof(Elf_Rela)) {
    ((Elf_Rela *)mrelp)->r_addend = addend;
    *mlocp++ = 0;
   } else
    *mlocp++ = addend;

   mrelp = (Elf_Rel *)(rel_entsize + (void *)mrelp);
  }
  relp = (Elf_Rel const *)(rel_entsize + (void *)relp);
}
*mrelpp = mrelp;
return mlocp;
}

/*
* Read the relocation table again, but this time its called on sections
* that are not going to be traced. The mcount calls here will be converted
* into nops.
*/
static int nop_mcount(Elf_Shdr const *const relhdr,
        Elf_Ehdr const *const ehdr,
        const char *const txtname)
{
Elf_Shdr *const shdr0 = (Elf_Shdr *)(_w(ehdr->e_shoff)
  + (void *)ehdr);
Elf_Sym const *sym0;
char const *str0;
Elf_Rel const *relp;
Elf_Shdr const *const shdr = &shdr0[w(relhdr->sh_info)];
unsigned rel_entsize = _w(relhdr->sh_entsize);
unsigned const nrel = _w(relhdr->sh_size) / rel_entsize;
unsigned mcountsym = 0;
unsigned t;
int once = 0;

get_sym_str_and_relp(relhdr, ehdr, &sym0, &str0, &relp);

for (t = nrel; t; --t) {
  int ret = -1;

  if (!mcountsym)
   mcountsym = get_mcountsym(sym0, relp, str0);

  if (mcountsym == Elf_r_sym(relp) && !is_fake_mcount(relp)) {
   if (make_nop)
    ret = make_nop((void *)ehdr, _w(shdr->sh_offset) + _w(relp->r_offset));
   if (warn_on_notrace_sect && !once) {
    printf("Section %s has mcount callers being ignored\n",
           txtname);
    once = 1;
    /* just warn? */
    if (!make_nop)
     return 0;
   }
  }

  /*
* If we successfully removed the mcount, mark the relocation
* as a nop (don't do anything with it).
*/
  if (!ret) {
   Elf_Rel rel;
   rel = *(Elf_Rel *)relp;
   Elf_r_info(&rel, Elf_r_sym(relp), rel_type_nop);
   if (ulseek((void *)relp - (void *)ehdr, SEEK_SET) < 0)
    return -1;
   if (uwrite(&rel, sizeof(rel)) < 0)
    return -1;
  }
  relp = (Elf_Rel const *)(rel_entsize + (void *)relp);
}
return 0;
}

/*
* Find a symbol in the given section, to be used as the base for relocating
* the table of offsets of calls to mcount.  A local or global symbol suffices,
* but avoid a Weak symbol because it may be overridden; the change in value
* would invalidate the relocations of the offsets of the calls to mcount.
* Often the found symbol will be the unnamed local symbol generated by
* GNU 'as' for the start of each section.  For example:
*    Num:    Value  Size Type    Bind   Vis      Ndx Name
*      2: 00000000     0 SECTION LOCAL  DEFAULT    1
*/
static int find_secsym_ndx(unsigned const txtndx,
    char const *const txtname,
    uint_t *const recvalp,
    unsigned int *sym_index,
    Elf_Shdr const *const symhdr,
    Elf32_Word const *symtab,
    Elf32_Word const *symtab_shndx,
    Elf_Ehdr const *const ehdr)
{
Elf_Sym const *const sym0 = (Elf_Sym const *)(_w(symhdr->sh_offset)
  + (void *)ehdr);
unsigned const nsym = _w(symhdr->sh_size) / _w(symhdr->sh_entsize);
Elf_Sym const *symp;
unsigned t;

for (symp = sym0, t = nsym; t; --t, ++symp) {
  unsigned int const st_bind = ELF_ST_BIND(symp->st_info);

  if (txtndx == get_symindex(symp, symtab, symtab_shndx)
   /* avoid STB_WEAK */
      && (STB_LOCAL == st_bind || STB_GLOBAL == st_bind)) {
   /* function symbols on ARM have quirks, avoid them */
   if (w2(ehdr->e_machine) == EM_ARM
       && ELF_ST_TYPE(symp->st_info) == STT_FUNC)
    continue;

   *recvalp = _w(symp->st_value);
   *sym_index = symp - sym0;
   return 0;
  }
}
fprintf(stderr, "Cannot find symbol for section %u: %s.\n",
  txtndx, txtname);
return -1;
}

/* Evade ISO C restriction: no declaration after statement in has_rel_mcount. */
static char const * __has_rel_mcount(Elf_Shdr const *const relhdr, /* reltype */
         Elf_Shdr const *const shdr0,
         char const *const shstrtab,
         char const *const fname)
{
/* .sh_info depends on .sh_type == SHT_REL[,A] */
Elf_Shdr const *const txthdr = &shdr0[w(relhdr->sh_info)];
char const *const txtname = &shstrtab[w(txthdr->sh_name)];

if (strcmp("__mcount_loc", txtname) == 0) {
  fprintf(stderr, "warning: __mcount_loc already exists: %s\n",
   fname);
  return already_has_rel_mcount;
}
if (w(txthdr->sh_type) != SHT_PROGBITS ||
     !(_w(txthdr->sh_flags) & SHF_EXECINSTR))
  return NULL;
return txtname;
}

static char const *has_rel_mcount(Elf_Shdr const *const relhdr,
      Elf_Shdr const *const shdr0,
      char const *const shstrtab,
      char const *const fname)
{
if (w(relhdr->sh_type) != SHT_REL && w(relhdr->sh_type) != SHT_RELA)
  return NULL;
return __has_rel_mcount(relhdr, shdr0, shstrtab, fname);
}

static unsigned tot_relsize(Elf_Shdr const *const shdr0,
       unsigned nhdr,
       const char *const shstrtab,
       const char *const fname)
{
unsigned totrelsz = 0;
Elf_Shdr const *shdrp = shdr0;
char const *txtname;

for (; nhdr; --nhdr, ++shdrp) {
  txtname = has_rel_mcount(shdrp, shdr0, shstrtab, fname);
  if (txtname == already_has_rel_mcount) {
   totrelsz = 0;
   break;
  }
  if (txtname && is_mcounted_section_name(txtname))
   totrelsz += _w(shdrp->sh_size);
}
return totrelsz;
}

/* Overall supervision for Elf32 ET_REL file. */
static int do_func(Elf_Ehdr *const ehdr, char const *const fname,
     unsigned const reltype)
{
Elf_Shdr *const shdr0 = (Elf_Shdr *)(_w(ehdr->e_shoff)
  + (void *)ehdr);
unsigned const nhdr = get_shnum(ehdr, shdr0);
Elf_Shdr *const shstr = &shdr0[get_shstrndx(ehdr, shdr0)];
char const *const shstrtab = (char const *)(_w(shstr->sh_offset)
  + (void *)ehdr);

Elf_Shdr const *relhdr;
unsigned k;

Elf32_Word *symtab;
Elf32_Word *symtab_shndx;

/* Upper bound on space: assume all relevant relocs are for mcount. */
unsigned       totrelsz;

Elf_Rel *      mrel0;
Elf_Rel *      mrelp;

uint_t *      mloc0;
uint_t *      mlocp;

unsigned rel_entsize = 0;
unsigned symsec_sh_link = 0;

int result = 0;

totrelsz = tot_relsize(shdr0, nhdr, shstrtab, fname);
if (totrelsz == 0)
  return 0;
mrel0 = umalloc(totrelsz);
mrelp = mrel0;
if (!mrel0)
  return -1;

/* 2*sizeof(address) <= sizeof(Elf_Rel) */
mloc0 = umalloc(totrelsz>>1);
mlocp = mloc0;
if (!mloc0) {
  free(mrel0);
  return -1;
}

find_symtab(ehdr, shdr0, nhdr, &symtab, &symtab_shndx);

for (relhdr = shdr0, k = nhdr; k; --k, ++relhdr) {
  char const *const txtname = has_rel_mcount(relhdr, shdr0,
   shstrtab, fname);
  if (txtname == already_has_rel_mcount) {
   result = 0;
   file_updated = 0;
   goto out; /* Nothing to be done; don't append! */
  }
  if (txtname && is_mcounted_section_name(txtname)) {
   unsigned int recsym;
   uint_t recval = 0;

   symsec_sh_link = w(relhdr->sh_link);
   result = find_secsym_ndx(w(relhdr->sh_info), txtname,
      &recval, &recsym,
      &shdr0[symsec_sh_link],
      symtab, symtab_shndx,
      ehdr);
   if (result)
    goto out;

   rel_entsize = _w(relhdr->sh_entsize);
   mlocp = sift_rel_mcount(mlocp,
    (void *)mlocp - (void *)mloc0, &mrelp,
    relhdr, ehdr, recsym, recval, reltype);
  } else if (txtname && (warn_on_notrace_sect || make_nop)) {
   /*
* This section is ignored by ftrace, but still
* has mcount calls. Convert them to nops now.
*/
   if (nop_mcount(relhdr, ehdr, txtname) < 0) {
    result = -1;
    goto out;
   }
  }
}
if (!result && mloc0 != mlocp)
  result = append_func(ehdr, shstr, mloc0, mlocp, mrel0, mrelp,
         rel_entsize, symsec_sh_link);
out:
free(mrel0);
free(mloc0);
return result;
}

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