Mr.X

/* 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;
}

Name	Type	Size	Permission
atomic	Folder		0755
basic	Folder		0755
clang-tools	Folder		0755
coccinelle	Folder		0755
dtc	Folder		0755
dummy-tools	Folder		0755
gcc-plugins	Folder		0755
gdb	Folder		0755
genksyms	Folder		0755
include	Folder		0755
kconfig	Folder		0755
ksymoops	Folder		0755
mod	Folder		0755
package	Folder		0755
selinux	Folder		0755
Kbuild.include	File	10.24 KB	0644
Kconfig.include	File	2.56 KB	0644
Lindent	File	506 B	0755
Makefile	File	1.74 KB	0644
Makefile.asm-generic	File	1.82 KB	0644
Makefile.btf	File	1.07 KB	0644
Makefile.build	File	17.1 KB	0644
Makefile.clean	File	2.02 KB	0644
Makefile.compiler	File	2.79 KB	0644
Makefile.dtbinst	File	998 B	0644
Makefile.extrawarn	File	3.25 KB	0644
Makefile.gcc-plugins	File	2.57 KB	0644
Makefile.headersinst	File	2.88 KB	0644
Makefile.host	File	4.63 KB	0644
Makefile.kasan	File	2.45 KB	0644
Makefile.kcov	File	333 B	0644
Makefile.kcsan	File	1004 B	0644
Makefile.kmsan	File	208 B	0644
Makefile.lib	File	21.16 KB	0644
Makefile.modfinal	File	2.74 KB	0644
Makefile.modinst	File	2.39 KB	0644
Makefile.modpost	File	4.16 KB	0644
Makefile.package	File	6.61 KB	0644
Makefile.randstruct	File	410 B	0644
Makefile.ubsan	File	837 B	0644
Makefile.userprogs	File	1.57 KB	0644
Makefile.vmlinux	File	890 B	0644
Makefile.vmlinux_o	File	2.54 KB	0644
adjust_autoksyms.sh	File	2.11 KB	0755
as-version.sh	File	2.05 KB	0755
asn1_compiler	File	30.13 KB	0755
asn1_compiler.c	File	35.32 KB	0644
bin2c.c	File	743 B	0644
bloat-o-meter	File	3.36 KB	0755
bootgraph.pl	File	5.64 KB	0755
bpf_doc.py	File	31.73 KB	0755
cc-can-link.sh	File	170 B	0755
cc-version.sh	File	1.35 KB	0755
check-sysctl-docs	File	4.37 KB	0755
check_extable.sh	File	4.93 KB	0755
checkdeclares.pl	File	1.1 KB	0644
checkincludes.pl	File	1.94 KB	0755
checkkconfigsymbols.py	File	15.88 KB	0755
checkpatch.pl	File	224.16 KB	0755
checkstack.pl	File	5.9 KB	0755
checksyscalls.sh	File	7.34 KB	0755
checkversion.pl	File	2.15 KB	0755
cleanfile	File	3.46 KB	0755
cleanpatch	File	5.06 KB	0755
coccicheck	File	7.89 KB	0755
config	File	4.67 KB	0755
const_structs.checkpatch	File	1009 B	0644
decode_stacktrace.sh	File	6.56 KB	0755
decodecode	File	2.89 KB	0755
depmod.sh	File	1.41 KB	0755
dev-needs.sh	File	6.08 KB	0755
diffconfig	File	4.12 KB	0755
documentation-file-ref-check	File	5.6 KB	0755
export_report.pl	File	4.49 KB	0755
extract-cert	File	14.12 KB	0755
extract-cert.c	File	3.63 KB	0644
extract-ikconfig	File	1.7 KB	0755
extract-module-sig.pl	File	3.65 KB	0755
extract-sys-certs.pl	File	3.74 KB	0755
extract-vmlinux	File	1.66 KB	0755
extract_xc3028.pl	File	44.61 KB	0755
faddr2line	File	6.16 KB	0755
file-size.sh	File	90 B	0755
find-unused-docs.sh	File	1.28 KB	0755
gcc-ld	File	715 B	0755
gcc-x86_32-has-stack-protector.sh	File	412 B	0755
gcc-x86_64-has-stack-protector.sh	File	202 B	0755
gen_autoksyms.sh	File	1.4 KB	0755
gen_ksymdeps.sh	File	403 B	0755
gen_packed_field_checks.c	File	1.19 KB	0644
generate_initcall_order.pl	File	5.94 KB	0755
generate_rust_target.rs	File	5.26 KB	0644
get_abi.pl	File	15.09 KB	0755
get_dvb_firmware	File	24.54 KB	0755
get_feat.pl	File	14.34 KB	0755
get_maintainer.pl	File	67.13 KB	0755
gfp-translate	File	1.71 KB	0755
headerdep.pl	File	3.5 KB	0755
headers_check.pl	File	3.73 KB	0755
headers_install.sh	File	3.17 KB	0755
insert-sys-cert.c	File	8.87 KB	0644
install.sh	File	990 B	0755
jobserver-exec	File	2.16 KB	0755
kallsyms	File	18.23 KB	0755
kallsyms.c	File	20.38 KB	0644
kernel-doc	File	66.32 KB	0755
ld-version.sh	File	1.67 KB	0755
leaking_addresses.pl	File	12.8 KB	0755
link-vmlinux.sh	File	8.88 KB	0755
makelst	File	812 B	0755
markup_oops.pl	File	7.92 KB	0755
min-tool-version.sh	File	473 B	0755
mkcompile_h	File	2.59 KB	0755
mksysmap	File	1.33 KB	0755
mkuboot.sh	File	418 B	0755
module.lds	File	432 B	0644
module.lds.S	File	1.49 KB	0644
modules-check.sh	File	431 B	0755
nsdeps	File	1.63 KB	0644
objdiff	File	2.83 KB	0755
objdump-func	File	715 B	0755
pahole-version.sh	File	273 B	0755
parse-maintainers.pl	File	4.54 KB	0755
patch-kernel	File	9.95 KB	0755
profile2linkerlist.pl	File	410 B	0755
prune-kernel	File	712 B	0755
recordmcount.c	File	16.69 KB	0644
recordmcount.h	File	19.37 KB	0644
recordmcount.pl	File	17.61 KB	0755
remove-stale-files	File	1.35 KB	0755
setlocalversion	File	3.59 KB	0755
show_delta	File	3.01 KB	0755
sign-file	File	22.16 KB	0755
sign-file.c	File	9.93 KB	0644
sorttable	File	22.12 KB	0755
sorttable.c	File	7.62 KB	0644
sorttable.h	File	12.85 KB	0644
spdxcheck-test.sh	File	323 B	0644
spelling.txt	File	31.92 KB	0644
sphinx-pre-install	File	24.29 KB	0755
split-man.pl	File	600 B	0755
stackdelta	File	1.84 KB	0755
stackusage	File	798 B	0755
subarch.include	File	641 B	0644
syscallhdr.sh	File	1.89 KB	0755
syscallnr.sh	File	1.45 KB	0644
syscalltbl.sh	File	1.46 KB	0755
tags.sh	File	9.66 KB	0755
test_fortify.sh	File	2.23 KB	0644
tools-support-relr.sh	File	550 B	0755
unifdef	File	34.12 KB	0755
unifdef.c	File	34.8 KB	0644
ver_linux	File	2.59 KB	0755
xen-hypercalls.sh	File	386 B	0644
xz_wrap.sh	File	567 B	0755

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