Commit-ID: b037d156f07e10d56a23d07f51e5cf65d0ffd0fa
Gitweb: http://git.kernel.org/tip/b037d156f07e10d56a23d07f51e5cf65d0ffd0fa
Author: Steven Rostedt <srostedt@xxxxxxxxxx>
AuthorDate: Mon, 10 Oct 2011 17:24:24 -0400
Committer: Steven Rostedt <rostedt@xxxxxxxxxxx>
CommitDate: Fri, 27 Jan 2012 16:50:59 -0500
jump labels: Add infrastructure to update jump labels at compile time
Add the infrastructure to allow architectures to modify the jump label
locations at compile time. This is mainly for x86, where the jmps may
be either 2 bytes or 5 bytes. Instead of wasting 5 bytes for all jump labels,
this code will let x86 put in a jmp instead of a 5 byte nop. Then the
assembler will make either a 2 byte or 5 byte jmp depending on where
the target is.
At compile time, this code will replace the jmps with either a 2 byte
or 5 byte nop depending on the size of the jmp that was added.
Cc: Jason Baron <jbaron@xxxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
Makefile | 7 +
arch/Kconfig | 6 +
scripts/Makefile | 1 +
scripts/Makefile.build | 15 ++-
scripts/update_jump_label.c | 341 +++++++++++++++++++++++++++++++++++++++++++
scripts/update_jump_label.h | 208 ++++++++++++++++++++++++++
6 files changed, 576 insertions(+), 2 deletions(-)
diff --git a/Makefile b/Makefile
index adddd11..2b3fdf3 100644
--- a/Makefile
+++ b/Makefile
@@ -611,6 +611,13 @@ ifdef CONFIG_DYNAMIC_FTRACE
endif
endif
+ifdef CONFIG_JUMP_LABEL
+ ifdef CONFIG_HAVE_BUILD_TIME_JUMP_LABEL
+ BUILD_UPDATE_JUMP_LABEL := y
+ export BUILD_UPDATE_JUMP_LABEL
+ endif
+endif
+
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
diff --git a/arch/Kconfig b/arch/Kconfig
index 4b0669c..8fa6934 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -169,6 +169,12 @@ config HAVE_PERF_EVENTS_NMI
subsystem. Also has support for calculating CPU cycle events
to determine how many clock cycles in a given period.
+config HAVE_BUILD_TIME_JUMP_LABEL
+ bool
+ help
+ If an arch uses scripts/update_jump_label to patch in jump nops
+ at build time, then it must enable this option.
+
config HAVE_ARCH_JUMP_LABEL
bool
diff --git a/scripts/Makefile b/scripts/Makefile
index df7678f..738b65c 100644
--- a/scripts/Makefile
+++ b/scripts/Makefile
@@ -13,6 +13,7 @@ hostprogs-$(CONFIG_LOGO) += pnmtologo
hostprogs-$(CONFIG_VT) += conmakehash
hostprogs-$(CONFIG_IKCONFIG) += bin2c
hostprogs-$(BUILD_C_RECORDMCOUNT) += recordmcount
+hostprogs-$(BUILD_UPDATE_JUMP_LABEL) += update_jump_label
always := $(hostprogs-y) $(hostprogs-m)
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index d2b366c..8a84b80 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -258,6 +258,15 @@ cmd_modversions = \
fi;
endif
+ifdef BUILD_UPDATE_JUMP_LABEL
+update_jump_label_source := $(srctree)/scripts/update_jump_label.c \
+ $(srctree)/scripts/update_jump_label.h
+cmd_update_jump_label = \
+ if [ $(@) != "scripts/mod/empty.o" ]; then \
+ $(objtree)/scripts/update_jump_label "$(@)"; \
+ fi;
+endif
+
ifdef CONFIG_FTRACE_MCOUNT_RECORD
ifdef BUILD_C_RECORDMCOUNT
ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
@@ -294,6 +303,7 @@ define rule_cc_o_c
$(cmd_modversions) \
$(call echo-cmd,record_mcount) \
$(cmd_record_mcount) \
+ $(cmd_update_jump_label) \
scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \
$(dot-target).tmp; \
rm -f $(depfile); \
@@ -301,13 +311,14 @@ define rule_cc_o_c
endef
# Built-in and composite module parts
-$(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
+$(obj)/%.o: $(src)/%.c $(recordmcount_source) $(update_jump_label_source) FORCE
$(call cmd,force_checksrc)
$(call if_changed_rule,cc_o_c)
# Single-part modules are special since we need to mark them in $(MODVERDIR)
-$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
+$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) \
+ $(update_jump_label_source) FORCE
$(call cmd,force_checksrc)
$(call if_changed_rule,cc_o_c)
@{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
diff --git a/scripts/update_jump_label.c b/scripts/update_jump_label.c
new file mode 100644
index 0000000..36d4b43
--- /dev/null
+++ b/scripts/update_jump_label.c
@@ -0,0 +1,341 @@
+/*
+ * update_jump_label.c: replace jmps with nops at compile time.
+ * Copyright 2010 Steven Rostedt <srostedt@xxxxxxxxxx>, Red Hat Inc.
+ * Parsing of the elf file was influenced by recordmcount.c
+ * originally written by and copyright to John F. Reiser <jreiser@xxxxxxxxxxxx>.
+ */
+
+/*
+ * Note, this code is originally designed for x86, but may be used by
+ * other archs to do the nop updates at compile time instead of at boot time.
+ * X86 uses this as an optimization, as jmps can be either 2 bytes or 5 bytes.
+ * Inserting a 2 byte where possible helps with both CPU performance and
+ * icache strain.
+ */
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <getopt.h>
+#include <elf.h>
+#include <fcntl.h>
+#include <setjmp.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <unistd.h>
+
+static int fd_map; /* File descriptor for file being modified. */
+static struct stat sb; /* Remember .st_size, etc. */
+static int mmap_failed; /* Boolean flag. */
+
+static void die(const char *err, const char *fmt, ...)
+{
+ va_list ap;
+
+ if (err)
+ perror(err);
+
+ if (fmt) {
+ va_start(ap, fmt);
+ fprintf(stderr, "Fatal error: ");
+ vfprintf(stderr, fmt, ap);
+ fprintf(stderr, "\n");
+ va_end(ap);
+ }
+
+ exit(1);
+}
+
+static void usage(char **argv)
+{
+ char *arg = argv[0];
+ char *p = arg + strlen(arg);
+
+ while (p >= arg && *p != '/')
+ p--;
+ p++;
+
+ printf("usage: %s file\n"
+ "\n", p);
+ exit(-1);
+}
+
+/* w8rev, w8nat, ...: Handle endianness. */
+
+static uint64_t w8rev(uint64_t const x)
+{
+ return ((0xff & (x >> (0 * 8))) << (7 * 8))
+ | ((0xff & (x >> (1 * 8))) << (6 * 8))
+ | ((0xff & (x >> (2 * 8))) << (5 * 8))
+ | ((0xff & (x >> (3 * 8))) << (4 * 8))
+ | ((0xff & (x >> (4 * 8))) << (3 * 8))
+ | ((0xff & (x >> (5 * 8))) << (2 * 8))
+ | ((0xff & (x >> (6 * 8))) << (1 * 8))
+ | ((0xff & (x >> (7 * 8))) << (0 * 8));
+}
+
+static uint32_t w4rev(uint32_t const x)
+{
+ return ((0xff & (x >> (0 * 8))) << (3 * 8))
+ | ((0xff & (x >> (1 * 8))) << (2 * 8))
+ | ((0xff & (x >> (2 * 8))) << (1 * 8))
+ | ((0xff & (x >> (3 * 8))) << (0 * 8));
+}
+
+static uint32_t w2rev(uint16_t const x)
+{
+ return ((0xff & (x >> (0 * 8))) << (1 * 8))
+ | ((0xff & (x >> (1 * 8))) << (0 * 8));
+}
+
+static uint64_t w8nat(uint64_t const x)
+{
+ return x;
+}
+
+static uint32_t w4nat(uint32_t const x)
+{
+ return x;
+}
+
+static uint32_t w2nat(uint16_t const x)
+{
+ return x;
+}
+
+static uint64_t (*w8)(uint64_t);
+static uint32_t (*w)(uint32_t);
+static uint32_t (*w2)(uint16_t);
+
+/* ulseek, uread, ...: Check return value for errors. */
+
+static off_t
+ulseek(int const fd, off_t const offset, int const whence)
+{
+ off_t const w = lseek(fd, offset, whence);
+ if (w == (off_t)-1)
+ die("lseek", NULL);
+
+ return w;
+}
+
+static size_t
+uread(int const fd, void *const buf, size_t const count)
+{
+ size_t const n = read(fd, buf, count);
+ if (n != count)
+ die("read", NULL);
+
+ return n;
+}
+
+static size_t
+uwrite(int const fd, void const *const buf, size_t const count)
+{
+ size_t const n = write(fd, buf, count);
+ if (n != count)
+ die("write", NULL);
+
+ return n;
+}
+
+static void *
+umalloc(size_t size)
+{
+ void *const addr = malloc(size);
+ if (addr == 0)
+ die("malloc", "malloc failed: %zu bytes\n", size);
+
+ return addr;
+}
+
+/*
+ * Get the whole file as a programming convenience in order to avoid
+ * malloc+lseek+read+free of many pieces. If successful, then mmap
+ * avoids copying unused pieces; else just read the whole file.
+ * Open for both read and write; new info will be appended to the file.
+ * Use MAP_PRIVATE so that a few changes to the in-memory ElfXX_Ehdr
+ * do not propagate to the file until an explicit overwrite at the last.
+ * This preserves most aspects of consistency (all except .st_size)
+ * for simultaneous readers of the file while we are appending to it.
+ * However, multiple writers still are bad. We choose not to use
+ * locking because it is expensive and the use case of kernel build
+ * makes multiple writers unlikely.
+ */
+static void *mmap_file(char const *fname)
+{
+ void *addr;
+
+ fd_map = open(fname, O_RDWR);
+ if (fd_map < 0 || fstat(fd_map, &sb) < 0)
+ die(fname, "failed to open file");
+
+ if (!S_ISREG(sb.st_mode))
+ die(NULL, "not a regular file: %s\n", fname);
+
+ addr = mmap(0, sb.st_size, PROT_READ|PROT_WRITE, MAP_PRIVATE,
+ fd_map, 0);
+
+ mmap_failed = 0;
+ if (addr == MAP_FAILED) {
+ mmap_failed = 1;
+ addr = umalloc(sb.st_size);
+ uread(fd_map, addr, sb.st_size);
+ }
+ return addr;
+}
+
+static void munmap_file(void *addr)
+{
+ if (!mmap_failed)
+ munmap(addr, sb.st_size);
+ else
+ free(addr);
+ close(fd_map);
+}
+
+/* P6_NOP5_ATOMIC */
+static unsigned char ideal_nop5_x86_64[5] = { 0x0f, 0x1f, 0x44, 0x00, 0x00 };
+
+/* GENERIC_NOP5_ATOMIC */
+static unsigned char ideal_nop5_x86_32[5] = { 0x3e, 0x8d, 0x74, 0x26, 0x00 };
+
+/* P6_NOP2 */
+static unsigned char ideal_nop2_x86[2] = { 0x66, 0x90 };
+
+static unsigned char *ideal_nop;
+
+static int (*make_nop)(void *map, size_t const offset);
+
+static int make_nop_x86(void *map, size_t const offset)
+{
+ unsigned char *op;
+ unsigned char *nop;
+ int size;
+
+ /* Determine which type of jmp this is 2 byte or 5. */
+ op = map + offset;
+ switch (*op) {
+ case 0xeb: /* 2 byte */
+ size = 2;
+ nop = ideal_nop2_x86;
+ break;
+ case 0xe9: /* 5 byte */
+ size = 5;
+ nop = ideal_nop;
+ break;
+ default:
+ die(NULL, "Bad jump label section (bad op %x)\n", *op);
+ __builtin_unreachable();
+ }
+
+ /* convert to nop */
+ ulseek(fd_map, offset, SEEK_SET);
+ uwrite(fd_map, nop, size);
+ return 0;
+}
+
+/* 32 bit and 64 bit are very similar */
+#include "update_jump_label.h"
+#define UPDATE_JUMP_LABEL_64
+#include "update_jump_label.h"
+
+static int do_file(const char *fname)
+{
+ Elf32_Ehdr *const ehdr = mmap_file(fname);
+ unsigned int reltype = 0;
+
+ w = w4nat;
+ w2 = w2nat;
+ w8 = w8nat;
+ switch (ehdr->e_ident[EI_DATA]) {
+ static unsigned int const endian = 1;
+ default:
+ die(NULL, "unrecognized ELF data encoding %d: %s\n",
+ ehdr->e_ident[EI_DATA], fname);
+ break;
+ case ELFDATA2LSB:
+ if (*(unsigned char const *)&endian != 1) {
+ /* main() is big endian, file.o is little endian. */
+ w = w4rev;
+ w2 = w2rev;
+ w8 = w8rev;
+ }
+ break;
+ case ELFDATA2MSB:
+ if (*(unsigned char const *)&endian != 0) {
+ /* main() is little endian, file.o is big endian. */
+ w = w4rev;
+ w2 = w2rev;
+ w8 = w8rev;
+ }
+ break;
+ } /* end switch */
+
+ if (memcmp(ELFMAG, ehdr->e_ident, SELFMAG) != 0 ||
+ w2(ehdr->e_type) != ET_REL ||
+ ehdr->e_ident[EI_VERSION] != EV_CURRENT)
+ die(NULL, "unrecognized ET_REL file %s\n", fname);
+
+ switch (w2(ehdr->e_machine)) {
+ default:
+ die(NULL, "unrecognized e_machine %d %s\n",
+ w2(ehdr->e_machine), fname);
+ break;
+ case EM_386:
+ reltype = R_386_32;
+ make_nop = make_nop_x86;
+ ideal_nop = ideal_nop5_x86_32;
+ break;
+ case EM_ARM: reltype = R_ARM_ABS32;
+ break;
+ case EM_IA_64: reltype = R_IA64_IMM64; break;
+ case EM_MIPS: /* reltype: e_class */ break;
+ case EM_PPC: reltype = R_PPC_ADDR32; break;
+ case EM_PPC64: reltype = R_PPC64_ADDR64; break;
+ case EM_S390: /* reltype: e_class */ break;
+ case EM_SH: reltype = R_SH_DIR32; break;
+ case EM_SPARCV9: reltype = R_SPARC_64; break;
+ case EM_X86_64:
+ make_nop = make_nop_x86;
+ ideal_nop = ideal_nop5_x86_64;
+ reltype = R_X86_64_64;
+ break;
+ } /* end switch */
+
+ switch (ehdr->e_ident[EI_CLASS]) {
+ default:
+ die(NULL, "unrecognized ELF class %d %s\n",
+ ehdr->e_ident[EI_CLASS], fname);
+ break;
+ case ELFCLASS32:
+ if (w2(ehdr->e_ehsize) != sizeof(Elf32_Ehdr)
+ || w2(ehdr->e_shentsize) != sizeof(Elf32_Shdr))
+ die(NULL, "unrecognized ET_REL file: %s\n", fname);
+
+ do_func32(ehdr, fname, reltype);
+ break;
+ case ELFCLASS64: {
+ Elf64_Ehdr *const ghdr = (Elf64_Ehdr *)ehdr;
+ if (w2(ghdr->e_ehsize) != sizeof(Elf64_Ehdr)
+ || w2(ghdr->e_shentsize) != sizeof(Elf64_Shdr))
+ die(NULL, "unrecognized ET_REL file: %s\n", fname);
+
+ do_func64(ghdr, fname, reltype);
+ break;
+ }
+ } /* end switch */
+
+ munmap_file(ehdr);
+ return 0;
+}
+
+int main(int argc, char **argv)
+{
+ if (argc != 2)
+ usage(argv);
+
+ return do_file(argv[1]);
+}
+
diff --git a/scripts/update_jump_label.h b/scripts/update_jump_label.h
new file mode 100644
index 0000000..181bd5b
--- /dev/null
+++ b/scripts/update_jump_label.h
@@ -0,0 +1,208 @@
+/*
+ * update_jump_label.h
+ *
+ * This code was based off of code from recordmcount.c written by
+ * Copyright 2009 John F. Reiser <jreiser@xxxxxxxxxxxx>. 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 UPDATE_JUMP_LABEL_64 undefined, and again with
+ * it defined.
+ *
+ * Copyright 2010 Steven Rostedt <srostedt@xxxxxxxxxx>, Red Hat Inc.
+ *
+ * Licensed under the GNU General Public License, version 2 (GPLv2).
+ */
+
+#undef EBITS
+#undef _w
+
+#ifdef UPDATE_JUMP_LABEL_64
+# define EBITS 64
+# define _w w8
+#else
+# define EBITS 32
+# define _w w
+#endif
+
+#define _FBITS(x, e) x##e
+#define FBITS(x, e) _FBITS(x, e)
+#define FUNC(x) FBITS(x, EBITS)
+
+#undef Elf_Ehdr
+#undef Elf_Shdr
+#undef Elf_Rel
+#undef Elf_Rela
+#undef Elf_Sym
+#undef ELF_R_SYM
+#undef ELF_R_TYPE
+
+#define __ATTACH(x, y, z) x##y##z
+#define ATTACH(x, y, z) __ATTACH(x, y, z)
+
+#define Elf_Ehdr ATTACH(Elf, EBITS, _Ehdr)
+#define Elf_Shdr ATTACH(Elf, EBITS, _Shdr)
+#define Elf_Rel ATTACH(Elf, EBITS, _Rel)
+#define Elf_Rela ATTACH(Elf, EBITS, _Rela)
+#define Elf_Sym ATTACH(Elf, EBITS, _Sym)
+#define uint_t ATTACH(uint, EBITS, _t)
+#define ELF_R_SYM ATTACH(ELF, EBITS, _R_SYM)
+#define ELF_R_TYPE ATTACH(ELF, EBITS, _R_TYPE)
+
+#undef get_shdr
+#define get_shdr(ehdr) ((Elf_Shdr *)(_w((ehdr)->e_shoff) + (void *)(ehdr)))
+
+#undef get_section_loc
+#define get_section_loc(ehdr, shdr)(_w((shdr)->sh_offset) + (void *)(ehdr))
+
+/* Find relocation section hdr for a given section */
+static const Elf_Shdr *
+FUNC(find_relhdr)(const Elf_Ehdr *ehdr, const Elf_Shdr *shdr)
+{
+ const Elf_Shdr *shdr0 = get_shdr(ehdr);
+ int nhdr = w2(ehdr->e_shnum);
+ const Elf_Shdr *hdr;
+ int i;
+
+ for (hdr = shdr0, i = 0; i < nhdr; hdr = &shdr0[++i]) {
+ if (w(hdr->sh_type) != SHT_REL &&
+ w(hdr->sh_type) != SHT_RELA)
+ continue;
+
+ /*
+ * The relocation section's info field holds
+ * the section index that it represents.
+ */
+ if (shdr == &shdr0[w(hdr->sh_info)])
+ return hdr;
+ }
+ return NULL;
+}
+
+/* Find a section headr based on name and type */
+static const Elf_Shdr *
+FUNC(find_shdr)(const Elf_Ehdr *ehdr, const char *name, uint_t type)
+{
+ const Elf_Shdr *shdr0 = get_shdr(ehdr);
+ const Elf_Shdr *shstr = &shdr0[w2(ehdr->e_shstrndx)];
+ const char *shstrtab = (char *)get_section_loc(ehdr, shstr);
+ int nhdr = w2(ehdr->e_shnum);
+ const Elf_Shdr *hdr;
+ const char *hdrname;
+ int i;
+
+ for (hdr = shdr0, i = 0; i < nhdr; hdr = &shdr0[++i]) {
+ if (w(hdr->sh_type) != type)
+ continue;
+
+ /* If we are just looking for a section by type (ie. SYMTAB) */
+ if (!name)
+ return hdr;
+
+ hdrname = &shstrtab[w(hdr->sh_name)];
+ if (strcmp(hdrname, name) == 0)
+ return hdr;
+ }
+ return NULL;
+}
+
+static void
+FUNC(section_update)(const Elf_Ehdr *ehdr, const Elf_Shdr *symhdr,
+ unsigned shtype, const Elf_Rel *rel, void *data)
+{
+ const Elf_Shdr *shdr0 = get_shdr(ehdr);
+ const Elf_Shdr *targethdr;
+ const Elf_Rela *rela;
+ const Elf_Sym *syment;
+ uint_t offset = _w(rel->r_offset);
+ uint_t info = _w(rel->r_info);
+ uint_t sym = ELF_R_SYM(info);
+ uint_t type = ELF_R_TYPE(info);
+ uint_t addend;
+ uint_t targetloc;
+
+ if (shtype == SHT_RELA) {
+ rela = (const Elf_Rela *)rel;
+ addend = _w(rela->r_addend);
+ } else
+ addend = _w(*(int *)(data + offset));
+
+ syment = (const Elf_Sym *)get_section_loc(ehdr, symhdr);
+ targethdr = &shdr0[w2(syment[sym].st_shndx)];
+ targetloc = _w(targethdr->sh_offset);
+
+ /* TODO, need a separate function for all archs */
+ if (type != R_386_32)
+ die(NULL, "Arch relocation type %d not supported", type);
+
+ targetloc += addend;
+
+ *(uint_t *)(data + offset) = targetloc;
+}
+
+/* Overall supervision for Elf32 ET_REL file. */
+static void
+FUNC(do_func)(Elf_Ehdr *ehdr, char const *const fname, unsigned const reltype)
+{
+ const Elf_Shdr *jlshdr;
+ const Elf_Shdr *jlrhdr;
+ const Elf_Shdr *symhdr;
+ const Elf_Rel *rel;
+ unsigned size;
+ unsigned cnt;
+ unsigned i;
+ uint_t type;
+ void *jdata;
+ void *data;
+
+ jlshdr = FUNC(find_shdr)(ehdr, "__jump_table", SHT_PROGBITS);
+ if (!jlshdr)
+ return;
+
+ jlrhdr = FUNC(find_relhdr)(ehdr, jlshdr);
+ if (!jlrhdr)
+ return;
+
+ /*
+ * Create and fill in the __jump_table section and use it to
+ * find the offsets into the text that we want to update.
+ * We create it so that we do not depend on the order of the
+ * relocations, and use the table directly, as it is broken
+ * up into sections.
+ */
+ size = _w(jlshdr->sh_size);
+ data = umalloc(size);
+
+ jdata = (void *)get_section_loc(ehdr, jlshdr);
+ memcpy(data, jdata, size);
+
+ cnt = _w(jlrhdr->sh_size) / w(jlrhdr->sh_entsize);
+
+ rel = (const Elf_Rel *)get_section_loc(ehdr, jlrhdr);
+
+ /* Is this as Rel or Rela? */
+ type = w(jlrhdr->sh_type);
+
+ symhdr = FUNC(find_shdr)(ehdr, NULL, SHT_SYMTAB);
+
+ for (i = 0; i < cnt; i++) {
+ FUNC(section_update)(ehdr, symhdr, type, rel, data);
+ rel = (void *)rel + w(jlrhdr->sh_entsize);
+ }
+
+ /*
+ * This is specific to x86. The jump_table is stored in three
+ * long words. The first is the location of the jmp target we
+ * must update.
+ */
+ cnt = size / sizeof(uint_t);
+
+ for (i = 0; i < cnt; i += 3)
+ make_nop((void *)ehdr, *(uint_t *)(data + i * sizeof(uint_t)));
+
+ free(data);
+}
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