[PATCH v3 2/4] perf inject: add jitdump mmap injection support

[Stephane Eranian]

This patch adds a -j jitdump option to perf inject.

This options injects MMAP records into the perf.data
file to cover the jitted code mmaps. It also emits
ELF images for each function in the jidump file.
Those images are created where the jitdump file is.
The MMAP records point to that location as well.

Typical flow:
$ java -agentpath:libpjvmti.so java_class
$ perf inject -j ~/.debug/jit/java-jit-20140514.XXAb0e5C/jit-7640.dump \
              -i perf.data \
              -o perf.data.jitted

$ perf report -i perf.data.jitted

Note that jitdump.h support is not limited to Java, it works with
any jitted environment modified to emit the jitdump file format,
include those where code can be jitted multiple times and moved
around.

The jitdump.h format is adapted from the Oprofile project.

Signed-off-by: Stephane Eranian <eranian@xxxxxxxxxx>
---
 tools/perf/Documentation/perf-inject.txt |  11 +
 tools/perf/Makefile.perf                 |   6 +-
 tools/perf/builtin-inject.c              | 205 ++++++++++++++
 tools/perf/util/genelf.c                 | 463 +++++++++++++++++++++++++++++++
 tools/perf/util/genelf.h                 |   6 +
 tools/perf/util/jit.h                    |  27 ++
 tools/perf/util/jitdump.c                | 233 ++++++++++++++++
 tools/perf/util/jitdump.h                |  92 ++++++
 8 files changed, 1042 insertions(+), 1 deletion(-)
 create mode 100644 tools/perf/util/genelf.c
 create mode 100644 tools/perf/util/genelf.h
 create mode 100644 tools/perf/util/jit.h
 create mode 100644 tools/perf/util/jitdump.c
 create mode 100644 tools/perf/util/jitdump.h

diff --git a/tools/perf/Documentation/perf-inject.txt b/tools/perf/Documentation/perf-inject.txt
index dc7442c..237f195 100644
--- a/tools/perf/Documentation/perf-inject.txt
+++ b/tools/perf/Documentation/perf-inject.txt
@@ -40,6 +40,17 @@ OPTIONS
 	Merge sched_stat and sched_switch for getting events where and how long
 	tasks slept. sched_switch contains a callchain where a task slept and
 	sched_stat contains a timeslice how long a task slept.
+-j::
+--jit::
+	Merge a jitdump file into the perf.data file by adding mmap records to
+	cover jitted code and emit ELF images for each jitted function. The ELF
+	images are saved in the same directory as the jidump. Use -E to suppress
+	ELF images generation.
+-E::
+--jit-disable-elf::
+	When used with -, it prevents creating the ELF images for each jitted
+	function. Only the jitted code mmap records are injected into the perf.data
+	file. Option as no effect when -j is not used.
 
 --kallsyms=<file>::
 	kallsyms pathname
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 53a44be..d405632 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -324,6 +324,7 @@ LIB_H += util/perf_regs.h
 LIB_H += util/unwind.h
 LIB_H += util/vdso.h
 LIB_H += util/tsc.h
+LIB_H += util/jitdump.h
 LIB_H += ui/helpline.h
 LIB_H += ui/progress.h
 LIB_H += ui/util.h
@@ -412,6 +413,8 @@ LIB_OBJS += $(OUTPUT)util/tsc.o
 LIB_OBJS += $(OUTPUT)util/cloexec.o
 LIB_OBJS += $(OUTPUT)util/thread-stack.o
 LIB_OBJS += $(OUTPUT)util/demangle-java.o
+LIB_OBJS += $(OUTPUT)util/jitdump.o
+LIB_OBJS += $(OUTPUT)util/genelf.o
 
 LIB_OBJS += $(OUTPUT)ui/setup.o
 LIB_OBJS += $(OUTPUT)ui/helpline.o
@@ -498,7 +501,8 @@ BUILTIN_OBJS += $(OUTPUT)builtin-inject.o
 BUILTIN_OBJS += $(OUTPUT)tests/builtin-test.o
 BUILTIN_OBJS += $(OUTPUT)builtin-mem.o
 
-PERFLIBS = $(LIB_FILE) $(LIBAPIKFS) $(LIBTRACEEVENT)
+PERFLIBS = $(LIB_FILE) $(LIBAPIKFS) $(LIBTRACEEVENT) -lcrypto
+
 
 # We choose to avoid "if .. else if .. else .. endif endif"
 # because maintaining the nesting to match is a pain.  If
diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
index a13641e..436203c 100644
--- a/tools/perf/builtin-inject.c
+++ b/tools/perf/builtin-inject.c
@@ -16,6 +16,8 @@
 #include "util/debug.h"
 #include "util/build-id.h"
 #include "util/data.h"
+#include "util/jit.h"
+#include "util/genelf.h"
 
 #include "util/parse-options.h"
 
@@ -30,6 +32,12 @@ struct perf_inject {
 	struct perf_data_file	output;
 	u64			bytes_written;
 	struct list_head	samples;
+
+	const char		*jit_filename;
+	FILE		 	*jit_file;
+	struct jit_buf_desc	jit_desc;
+	char			jit_dir[PATH_MAX];
+	bool		 	jit_disable_elf;
 };
 
 struct event_entry {
@@ -334,7 +342,170 @@ static int perf_evsel__check_stype(struct perf_evsel *evsel,
 			name, sample_msg);
 		return -EINVAL;
 	}
+	return 0;
+}
+
+static int jit_emit_elf(char *filename,
+			const char *sym,
+			unsigned long code,
+			int csize)
+{
+	int ret, fd;
+	unsigned long addr = (unsigned long)code;
+
+	fd = open(filename, O_CREAT|O_TRUNC|O_WRONLY, 0644);
+	if (fd == -1) {
+		pr_warning("cannot create jit ELF %s: %s\n", filename, strerror(errno));
+		return -1;
+	}
+
+        ret = jit_write_elf(fd, addr, sym, (const void *)code, csize);
+
+        close(fd);
+
+        if (ret)
+                unlink(filename);
+
+	return ret;
+}
+
+static int jit_repipe_code_load(struct perf_inject *inject, union jr_entry *jr)
+{
+	struct perf_sample sample;
+	union perf_event *event;
+	unsigned long code, addr;
+	size_t size;
+	const char *sym;
+	uint32_t count;
+	int ret, csize;
+	pid_t pid;
+	struct {
+		u32 pid, tid;
+		u64 time;
+	} *id;
+
+	pid   = jr->load.pid;
+	csize = jr->load.code_size;
+	addr  = jr->load.code_addr;
+	sym   = (void *)((unsigned long)jr + sizeof(jr->load));
+	code  = (unsigned long)jr + jr->load.p.total_size - csize;
+	count = jr->load.code_index;
+
+	/*
+	 * +16 to account for sample_id_all (hack)
+	 */
+	event = malloc(sizeof(*event) + 16);
+	if (!event)
+		return -1;
+
+	memset(event, 0, sizeof(*event));
+
+	size = snprintf(event->mmap.filename, PATH_MAX, "%s/jitted-%d-%u",
+		 inject->jit_dir,
+		 pid,
+		 count) + 1;
+	size = PERF_ALIGN(size, sizeof(u64));
+	if (!inject->jit_disable_elf) {
+		ret = jit_emit_elf(event->mmap.filename, sym, code, csize);
+		if (ret) {
+			free(event);
+			return -1;
+		}
+	}
+
+	event->mmap.header.type = PERF_RECORD_MMAP;
+	event->mmap.header.misc = PERF_RECORD_MISC_USER;
+	//event->mmap.header.size = sizeof(event->mmap) + 16;
+	event->mmap.header.size = (sizeof(event->mmap) -
+			(sizeof(event->mmap.filename) - size) + 16); //machine->id_hdr_size);
+	event->mmap.pgoff = 0;
+	event->mmap.start = addr;
+	event->mmap.len   = csize;
+	event->mmap.pid   = pid;
+	event->mmap.tid   = jr->load.tid;
+
+	id = (void *)((unsigned long)event + event->mmap.header.size - 16);
+	id->pid  = pid;
+	id->tid  = jr->load.tid;
+	id->time = jr->load.p.timestamp;
+
+	memset(&sample, 0, sizeof(sample));
+	sample.time = id->time;
+
+	return perf_event__repipe_synth(&inject->tool, event);
+}
+
+static int jit_repipe_code_move(struct perf_inject *inject, union jr_entry *jr)
+{
+	struct perf_sample sample;
+	union perf_event *event;
+	pid_t pid;
+	struct {
+		u32 pid, tid;
+		u64 time;
+	} *id;
+
+	pid      = jr->move.pid;
+
+	/*
+	 * +16 to account for sample_id_all (hack)
+	 */
+	event = malloc(sizeof(*event) + 16);
+	if (!event)
+		return -1;
+
+	memset(event, 0, sizeof(*event));
+
+	snprintf(event->mmap.filename, PATH_MAX, "%s/jitted-%d-%"PRIu64,
+	         inject->jit_dir,
+	         pid,
+		 jr->move.code_index);
+
+	event->mmap.header.type = PERF_RECORD_MMAP;
+	event->mmap.header.misc = PERF_RECORD_MISC_USER;
+	event->mmap.header.size = sizeof(event->mmap) + 16;
+	event->mmap.pgoff = 0;
+	event->mmap.start = jr->move.new_code_addr;
+	event->mmap.len   = jr->move.code_size;
+	event->mmap.pid   = pid;
+	event->mmap.tid   = jr->move.tid;
+
+	id = (void *)((unsigned long)event + sizeof(event->mmap));
+	id->pid  = pid;
+	id->tid  = jr->move.tid;
+	id->time = jr->move.p.timestamp;
+
+	memset(&sample, 0, sizeof(sample));
+	sample.time = id->time;
+
+	return perf_event__repipe_synth(&inject->tool, event);
+}
+
+static int perf_jit_inject(struct perf_inject *inject)
+{
+	union jr_entry *jr;
+
+	strncpy(inject->jit_dir, inject->jit_filename, PATH_MAX);
+	dirname(inject->jit_dir);
+
+	if (!strcmp(inject->jit_filename, inject->jit_dir)) {
+		inject->jit_dir[0] = '.';
+		inject->jit_dir[1] = '\0';
+	}
 
+	while ((jr = jit_get_next_entry(&inject->jit_desc))) {
+		switch(jr->prefix.id) {
+		case JIT_CODE_LOAD:
+			jit_repipe_code_load(inject, jr);
+			break;
+		case JIT_CODE_MOVE:
+			pr_warning("CODE_MOVE\n");
+			jit_repipe_code_move(inject, jr);
+			break;
+		default:
+			continue;
+		}
+	}
 	return 0;
 }
 
@@ -381,6 +552,9 @@ static int __cmd_inject(struct perf_inject *inject)
 
 	ret = perf_session__process_events(session, &inject->tool);
 
+	if (ret == 0 && inject->jit_filename)
+		ret = perf_jit_inject(inject);
+
 	if (!file_out->is_pipe) {
 		if (inject->build_ids)
 			perf_header__set_feat(&session->header,
@@ -418,6 +592,8 @@ int cmd_inject(int argc, const char **argv, const char *prefix __maybe_unused)
 			.path = "-",
 			.mode = PERF_DATA_MODE_WRITE,
 		},
+		.jit_disable_elf = false,
+
 	};
 	struct perf_data_file file = {
 		.mode = PERF_DATA_MODE_READ,
@@ -434,6 +610,10 @@ int cmd_inject(int argc, const char **argv, const char *prefix __maybe_unused)
 		OPT_BOOLEAN('s', "sched-stat", &inject.sched_stat,
 			    "Merge sched-stat and sched-switch for getting events "
 			    "where and how long tasks slept"),
+		OPT_STRING('j', "jit", &inject.jit_filename, "merge jitdump file",
+			   "input file name"),
+		OPT_BOOLEAN('E', "jit-disable-elf", &inject.jit_disable_elf,
+			    "Do not emit ELF images from jitdump file"),
 		OPT_INCR('v', "verbose", &verbose,
 			 "be more verbose (show build ids, etc)"),
 		OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name, "file",
@@ -463,6 +643,28 @@ int cmd_inject(int argc, const char **argv, const char *prefix __maybe_unused)
 	if (inject.session == NULL)
 		return -1;
 
+	if (inject.build_ids) {
+		/*
+		 * to make sure the mmap records are ordered correctly
+		 * and so that the correct especially due to jitted code
+		 * mmaps. We cannot generate the buildid hit list and
+		 * inject the jit mmaps at the same time for now.
+		 */
+		inject.tool.ordered_events = true;
+		inject.tool.ordering_requires_timestamps = true;
+	}
+
+	if (inject.jit_filename) {
+		inject.tool.ordered_events = true;
+		inject.tool.ordering_requires_timestamps = true;
+		ret = jit_open_dump(inject.jit_filename, &inject.jit_desc);
+		if (ret) {
+			fprintf(stderr, "cannot open jitdump file %s\n", inject.jit_filename);
+			return -1;
+		}
+	}
+
+
 	if (symbol__init(&inject.session->header.env) < 0)
 		return -1;
 
@@ -470,5 +672,8 @@ int cmd_inject(int argc, const char **argv, const char *prefix __maybe_unused)
 
 	perf_session__delete(inject.session);
 
+	if (inject.jit_filename)
+		jit_close_dump(&inject.jit_desc);
+
 	return ret;
 }
diff --git a/tools/perf/util/genelf.c b/tools/perf/util/genelf.c
new file mode 100644
index 0000000..a6f9e43
--- /dev/null
+++ b/tools/perf/util/genelf.c
@@ -0,0 +1,463 @@
+/*
+ * genelf.c
+ * Copyright (C) 2014, Google, Inc
+ *
+ * Contributed by:
+ * 	Stephane Eranian <eranian@xxxxxxxxx>
+ *
+ * Released under the GPL v2. (and only v2, not any later version)
+ */
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <getopt.h>
+#include <stddef.h>
+#include <libelf.h>
+#include <string.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <err.h>
+
+#include "perf.h"
+#include "genelf.h"
+
+#define JVMTI
+#define BUILD_ID_MD5
+#undef BUILD_ID_SHA	/* does not seem to work well when linked with Java */
+#undef  BUILD_ID_URANDOM	/* different uuid for each run */
+
+#ifdef BUILD_ID_SHA
+#include <openssl/sha.h>
+#endif
+
+#ifdef BUILD_ID_MD5
+#include <openssl/md5.h>
+#endif
+
+#if   defined(__arm__)
+#define GEN_ELF_ARCH	EM_ARM
+#define GEN_ELF_ENDIAN	ELFDATA2LSB
+#define GEN_ELF_CLASS	ELFCLASS32
+#elif defined(__x86_64__)
+#define GEN_ELF_ARCH	EM_X86_64
+#define GEN_ELF_ENDIAN	ELFDATA2LSB
+#define GEN_ELF_CLASS	ELFCLASS64
+#elif defined(__i386__)
+#define GEN_ELF_ARCH	EM_386
+#define GEN_ELF_ENDIAN	ELFDATA2LSB
+#define GEN_ELF_CLASS	ELFCLASS32
+#elif defined(__ppcle__)
+#define GEN_ELF_ARCH	EM_PPC
+#define GEN_ELF_ENDIAN	ELFDATA2LSB
+#define GEN_ELF_CLASS	ELFCLASS64
+#elif defined(__powerpc__)
+#define GEN_ELF_ARCH	EM_PPC64
+#define GEN_ELF_ENDIAN	ELFDATA2MSB
+#define GEN_ELF_CLASS	ELFCLASS64
+#elif defined(__powerpcle__)
+#define GEN_ELF_ARCH	EM_PPC64
+#define GEN_ELF_ENDIAN	ELFDATA2LSB
+#define GEN_ELF_CLASS	ELFCLASS64
+#else
+#error "unsupported architecture"
+#endif
+
+#if GEN_ELF_CLASS == ELFCLASS64
+#define elf_newehdr	elf64_newehdr
+#define elf_getshdr	elf64_getshdr
+#define Elf_Ehdr	Elf64_Ehdr
+#define Elf_Shdr	Elf64_Shdr
+#define Elf_Sym		Elf64_Sym
+#define ELF_ST_TYPE(a)	ELF64_ST_TYPE(a)
+#define ELF_ST_BIND(a)	ELF64_ST_BIND(a)
+#define ELF_ST_VIS(a)	ELF64_ST_VISIBILITY(a)
+#else
+#define elf_newehdr	elf32_newehdr
+#define elf_getshdr	elf32_getshdr
+#define Elf_Ehdr	Elf32_Ehdr
+#define Elf_Shdr	Elf32_Shdr
+#define Elf_Sym		Elf32_Sym
+#define ELF_ST_TYPE(a)	ELF32_ST_TYPE(a)
+#define ELF_ST_BIND(a)	ELF32_ST_BIND(a)
+#define ELF_ST_VIS(a)	ELF32_ST_VISIBILITY(a)
+#endif
+
+typedef struct {
+  unsigned int namesz;  /* Size of entry's owner string */
+  unsigned int descsz;  /* Size of the note descriptor */
+  unsigned int type;    /* Interpretation of the descriptor */
+  char         name[0]; /* Start of the name+desc data */
+} Elf_Note;
+
+struct options {
+	char *output;
+	int fd;
+};
+
+static char shd_string_table[] = {
+	0,
+	'.', 't', 'e', 'x', 't', 0,			/*  1 */
+	'.', 's', 'h', 's', 't', 'r', 't', 'a', 'b', 0, /*  7 */
+	'.', 's', 'y', 'm', 't', 'a', 'b', 0,		/* 17 */
+	'.', 's', 't', 'r', 't', 'a', 'b', 0,		/* 25 */
+	'.', 'n', 'o', 't', 'e', '.', 'g', 'n', 'u', '.', 'b', 'u', 'i', 'l', 'd', '-', 'i', 'd', 0, /* 33 */
+};
+
+
+static struct buildid_note {
+	Elf_Note desc;		/* descsz: size of build-id, must be multiple of 4 */
+	char	 name[4];	/* GNU\0 */
+	char	 build_id[20];
+} bnote;
+
+static Elf_Sym symtab[]={
+	/* symbol 0 MUST be the undefined symbol */
+	{ .st_name  = 0, /* index in sym_string table */
+	  .st_info  = ELF_ST_TYPE(STT_NOTYPE),
+	  .st_shndx = 0, /* for now */
+	  .st_value = 0x0,
+	  .st_other = ELF_ST_VIS(STV_DEFAULT),
+	  .st_size  = 0,
+	},
+	{ .st_name  = 1, /* index in sym_string table */
+	  .st_info  = ELF_ST_BIND(STB_LOCAL) | ELF_ST_TYPE(STT_FUNC),
+	  .st_shndx = 1,
+	  .st_value = 0, /* for now */
+	  .st_other = ELF_ST_VIS(STV_DEFAULT),
+	  .st_size  = 0, /* for now */
+	}
+};
+
+#ifdef BUILD_ID_URANDOM
+static void
+gen_build_id(struct buildid_note *note, unsigned long load_addr, const void *code, size_t csize)
+{
+	int fd;
+
+	fd = open("/dev/urandom", O_RDONLY);
+	if (fd == -1)
+		err(1, "cannot access /dev/urandom for builid");
+	read(fd, note->build_id, sizeof(note->build_id));
+	close(fd);
+}
+#endif
+
+#ifdef BUILD_ID_SHA
+static void
+gen_build_id(struct buildid_note *note,
+	     unsigned long load_addr __maybe_unused,
+	     const void *code,
+	     size_t csize)
+{
+        if (sizeof(note->build_id) < SHA_DIGEST_LENGTH)
+                errx(1, "build_id too small for SHA1");
+
+	SHA1(code, csize, (unsigned char *)note->build_id);
+}
+#endif
+
+#ifdef BUILD_ID_MD5
+static void
+gen_build_id(struct buildid_note *note, unsigned long load_addr, const void *code, size_t csize)
+{
+        MD5_CTX context;
+
+        if (sizeof(note->build_id) < 16)
+                errx(1, "build_id too small for MD5");
+
+        MD5_Init(&context);
+        MD5_Update(&context, &load_addr, sizeof(load_addr));
+        MD5_Update(&context, code, csize);
+        MD5_Final((unsigned char *)note->build_id, &context);
+}
+#endif
+
+/*
+ * fd: file descriptor open for writing for the output file
+ * load_addr: code load address (could be zero, just used for buildid)
+ * sym: function name (for native code - used as the symbol)
+ * code: the native code
+ * csize: the code size in bytes
+ */
+int
+jit_write_elf(int fd, unsigned long load_addr, const char *sym, const void *code, int csize)
+{
+	Elf *e;
+	Elf_Data *d;
+	Elf_Scn *scn;
+	Elf_Ehdr *ehdr;
+	Elf_Shdr *shdr;
+	char *strsym = NULL;
+	int symlen;
+	int retval = -1;
+
+	if (elf_version(EV_CURRENT) == EV_NONE) {
+		warnx("ELF initialization failed");
+		return -1;
+	}
+
+	e = elf_begin(fd, ELF_C_WRITE, NULL);
+	if (!e) {
+		warnx("elf_begin failed");
+		goto error;
+	}
+
+	/*
+	 * setup ELF header
+	 */
+	ehdr = elf_newehdr(e);
+	if (!ehdr) {
+		warnx("cannot get ehdr");
+		goto error;
+	}
+
+	ehdr->e_ident[EI_DATA] = GEN_ELF_ENDIAN;
+	ehdr->e_ident[EI_CLASS] = GEN_ELF_CLASS;
+	ehdr->e_machine = GEN_ELF_ARCH;
+	ehdr->e_type = ET_DYN;
+	ehdr->e_entry = 0x0;
+	ehdr->e_version = EV_CURRENT;
+	ehdr->e_shstrndx= 2; /* shdr index for section name */
+
+	/*
+	 * setup text section
+	 */
+	scn = elf_newscn(e);
+	if (!scn) {
+		warnx("cannot create section");
+		goto error;
+	}
+
+	d = elf_newdata(scn);
+	if (!d) {
+		warnx("cannot get new data");
+		goto error;
+	}
+
+	d->d_align = 16;
+	d->d_off = 0LL;
+	d->d_buf = (void *)code;
+	d->d_type = ELF_T_BYTE;
+	d->d_size = csize;
+	d->d_version = EV_CURRENT;
+
+	shdr = elf_getshdr(scn);
+	if (!shdr) {
+		warnx("cannot get section header");
+		goto error;
+	}
+
+	shdr->sh_name = 1;
+	shdr->sh_type = SHT_PROGBITS;
+	shdr->sh_addr = 0; /* must be zero or == sh_offset -> dynamic object */
+	shdr->sh_flags = SHF_EXECINSTR | SHF_ALLOC;
+	shdr->sh_entsize = 0;
+
+	/*
+	 * setup section headers string table
+	 */
+	scn = elf_newscn(e);
+	if (!scn) {
+		warnx("cannot create section");
+		goto error;
+	}
+
+	d = elf_newdata(scn);
+	if (!d) {
+		warnx("cannot get new data");
+		goto error;
+	}
+
+	d->d_align = 1;
+	d->d_off = 0LL;
+	d->d_buf = shd_string_table;
+	d->d_type = ELF_T_BYTE;
+	d->d_size = sizeof(shd_string_table);
+	d->d_version = EV_CURRENT;
+
+	shdr = elf_getshdr(scn);
+	if (!shdr) {
+		warnx("cannot get section header");
+		goto error;
+	}
+
+	shdr->sh_name = 7; /* offset of '.shstrtab' in shd_string_table */
+	shdr->sh_type = SHT_STRTAB;
+	shdr->sh_flags = 0;
+	shdr->sh_entsize = 0;
+
+	/*
+	 * setup symtab section
+	 */
+	symtab[1].st_size  = csize;
+
+	scn = elf_newscn(e);
+	if (!scn) {
+		warnx("cannot create section");
+		goto error;
+	}
+
+	d = elf_newdata(scn);
+	if (!d) {
+		warnx("cannot get new data");
+		goto error;
+	}
+
+	d->d_align = 8;
+	d->d_off = 0LL;
+	d->d_buf = symtab;
+	d->d_type = ELF_T_SYM;
+	d->d_size = sizeof(symtab);
+	d->d_version = EV_CURRENT;
+
+	shdr = elf_getshdr(scn);
+	if (!shdr) {
+		warnx("cannot get section header");
+		goto error;
+	}
+
+	shdr->sh_name = 17; /* offset of '.symtab' in shd_string_table */
+	shdr->sh_type = SHT_SYMTAB;
+	shdr->sh_flags = 0;
+	shdr->sh_entsize = sizeof(Elf_Sym);
+	shdr->sh_link = 4; /* index of .strtab section */
+
+	/*
+	 * setup symbols string table
+	 * 2 = 1 for 0 in 1st entry, 1 for the 0 at end of symbol for 2nd entry
+	 */
+	symlen = 2 + strlen(sym);
+	strsym = calloc(1, symlen);
+	if (!strsym) {
+		warnx("cannot allocate strsym");
+		goto error;
+	}
+	strcpy(strsym + 1, sym);
+
+	scn = elf_newscn(e);
+	if (!scn) {
+		warnx("cannot create section");
+		goto error;
+	}
+
+	d = elf_newdata(scn);
+	if (!d) {
+		warnx("cannot get new data");
+		goto error;
+	}
+
+	d->d_align = 1;
+	d->d_off = 0LL;
+	d->d_buf = strsym;
+	d->d_type = ELF_T_BYTE;
+	d->d_size = symlen;
+	d->d_version = EV_CURRENT;
+
+	shdr = elf_getshdr(scn);
+	if (!shdr) {
+		warnx("cannot get section header");
+		goto error;
+	}
+
+	shdr->sh_name = 25; /* offset in shd_string_table */
+	shdr->sh_type = SHT_STRTAB;
+	shdr->sh_flags = 0;
+	shdr->sh_entsize = 0;
+
+	/*
+	 * setup build-id section
+	 */
+	scn = elf_newscn(e);
+	if (!scn) {
+		warnx("cannot create section");
+		goto error;
+	}
+
+	d = elf_newdata(scn);
+	if (!d) {
+		warnx("cannot get new data");
+		goto error;
+	}
+	
+	/*
+	 * build-id generation
+	 */
+	gen_build_id(&bnote, load_addr, code, csize);
+	bnote.desc.namesz = sizeof(bnote.name); /* must include 0 termination */
+	bnote.desc.descsz = sizeof(bnote.build_id);
+	bnote.desc.type   = NT_GNU_BUILD_ID;
+	strcpy(bnote.name, "GNU");
+
+	d->d_align = 4;
+	d->d_off = 0LL;
+	d->d_buf = &bnote;
+	d->d_type = ELF_T_BYTE;
+	d->d_size = sizeof(bnote);
+	d->d_version = EV_CURRENT;
+
+	shdr = elf_getshdr(scn);
+	if (!shdr) {
+		warnx("cannot get section header");
+		goto error;
+	}
+
+	shdr->sh_name = 33; /* offset in shd_string_table */
+	shdr->sh_type = SHT_NOTE;
+	shdr->sh_addr = 0x0;
+	shdr->sh_flags = SHF_ALLOC;
+	shdr->sh_size = sizeof(bnote);
+	shdr->sh_entsize = 0;
+
+	if (elf_update(e, ELF_C_WRITE) < 0) {
+		warnx("elf_update 4 failed");
+		goto error;
+	}
+	(void)elf_end(e);
+
+	retval = 0;
+error:
+	free(strsym);
+
+	return retval;
+}
+
+#ifndef JVMTI
+
+static unsigned char x86_code[] = {
+    0xBB, 0x2A, 0x00, 0x00, 0x00, /* movl $42, %ebx */
+    0xB8, 0x01, 0x00, 0x00, 0x00, /* movl $1, %eax */
+    0xCD, 0x80            /* int $0x80 */
+};
+
+static struct options options;
+
+int main(int argc, char **argv)
+{
+	int c, fd, ret;
+
+	while ((c = getopt(argc, argv, "o:h")) != -1) {
+		switch (c) {
+		case 'o':
+			options.output = optarg;
+			break;
+		case 'h':
+			printf("Usage: genelf -o output_file [-h]\n");
+			return 0;
+		default:
+			errx(1, "unknown option");
+		}
+	}
+
+	fd = open(options.output, O_CREAT|O_TRUNC|O_RDWR, 0666);
+	if (fd == -1)
+		err(1, "cannot create file %s", options.output);
+
+	ret = jit_write_elf(fd, "main", x86_code, sizeof(x86_code));
+	close(fd);
+
+	if (ret != 0)
+		unlink(options.output);
+
+	return ret;
+}
+#endif
diff --git a/tools/perf/util/genelf.h b/tools/perf/util/genelf.h
new file mode 100644
index 0000000..11307a2
--- /dev/null
+++ b/tools/perf/util/genelf.h
@@ -0,0 +1,6 @@
+#ifndef __GENELF_H__
+#define __GENELF_H__
+
+extern int jit_write_elf(int fd, unsigned long code_addr, const char *sym, const void *code, int csize);
+
+#endif
diff --git a/tools/perf/util/jit.h b/tools/perf/util/jit.h
new file mode 100644
index 0000000..e7a54cb
--- /dev/null
+++ b/tools/perf/util/jit.h
@@ -0,0 +1,27 @@
+#ifndef __JIT_H__
+#define __JIT_H__
+#include <sys/time.h>
+#include <stdint.h>
+
+#include "jitdump.h"
+
+struct jit_buf_desc {
+	union jr_entry  *entry;
+	void            *buf;
+	size_t          bufsize;
+	FILE            *in;
+	int             needs_bswap; /* handles cross-endianess */
+	uint32_t        code_load_count;
+	struct rb_root  code_root;
+};
+ 
+extern int jit_open_dump(const char *name, struct jit_buf_desc *jd);
+extern void jit_close_dump(struct jit_buf_desc *jd);
+extern union jr_entry *jit_get_next_entry(struct jit_buf_desc *jd);
+
+/*
+ * use type = -1 to match any record type
+ */
+extern union jr_entry *jit_get_next_entry_type(struct jit_buf_desc *jd, int type);
+
+#endif /* __JIT_H__ */
diff --git a/tools/perf/util/jitdump.c b/tools/perf/util/jitdump.c
new file mode 100644
index 0000000..28a9429
--- /dev/null
+++ b/tools/perf/util/jitdump.c
@@ -0,0 +1,233 @@
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <inttypes.h>
+#include <byteswap.h>
+
+#include "util.h"
+#include "debug.h"
+#include "symbol.h"
+#include "strlist.h"
+#include <elf.h>
+
+#include "jit.h"
+
+struct debug_line_info {
+	unsigned long vma;
+	unsigned int lineno;
+	/* The filename format is unspecified, absolute path, relative etc. */
+	char const filename[0];
+};
+
+#define hmax(a, b) ((a) > (b) ? (a) : (b))
+
+void
+jit_close_dump(struct jit_buf_desc *jd)
+{
+	if (!(jd && jd->in))
+		return;
+	fclose(jd->in);
+	jd->in = NULL;
+}
+
+int
+jit_open_dump(const char *name, struct jit_buf_desc *jd)
+{
+	struct jitheader header;
+	struct jr_prefix *prefix;
+	ssize_t bs, bsz = 0;
+	void *n, *buf = NULL;
+	int ret, retval = -1;
+
+	if (!jd || jd->in)
+		return -1;
+
+	memset(jd, 0, sizeof(*jd));
+
+	jd->in = fopen(name, "r");
+	if (!jd->in)
+		return -1;
+
+	bsz = hmax(sizeof(header), sizeof(*prefix));
+
+	buf = malloc(bsz);
+	if (!buf)
+		goto error;
+
+	ret = fread(buf, sizeof(header), 1, jd->in);
+	if (ret != 1)
+		goto error;
+
+	memcpy(&header, buf, sizeof(header));
+
+	if (header.magic != JITHEADER_MAGIC) {
+		if (header.magic != JITHEADER_MAGIC_SW)
+			goto error;
+		jd->needs_bswap = 1;
+	}
+
+	if (jd->needs_bswap) {
+		header.version    = bswap_32(header.version);
+		header.total_size = bswap_32(header.total_size);
+		header.pid	  = bswap_32(header.pid);
+		header.elf_mach   = bswap_32(header.elf_mach);
+		header.timestamp  = bswap_32(header.timestamp);
+	}
+
+	pr_debug("version=%u\nsize=%u(%zu)\nts=0x%llx\npid=%d\nelf_mach=%d\n",
+		header.version,
+		header.total_size,
+		header.total_size - sizeof(header),
+		(unsigned long long)header.timestamp,
+		header.pid,
+		header.elf_mach);
+
+	bs = header.total_size - sizeof(header);
+
+	if (bs > bsz) {
+		n = realloc(buf, bs);
+		if (!n)
+			goto error;
+		bsz = bs;
+		buf = n;
+		/* read extra we do not know about */
+		ret = fread(buf, bs - bsz, 1, jd->in);
+		if (ret != 1)
+			goto error;
+	}
+	retval = 0;
+error:
+	return retval;
+}
+
+union jr_entry *
+jit_get_next_entry(struct jit_buf_desc *jd)
+{
+	struct jr_prefix *prefix;
+	union jr_entry *jr;
+	void *addr;
+	size_t bs, size;
+	int id, ret;
+
+	if (!(jd && jd->in))
+		return NULL;
+
+	if (jd->buf == NULL) {
+		size_t sz = getpagesize();
+		if (sz < sizeof(*prefix))
+			sz = sizeof(*prefix);
+
+		jd->buf = malloc(sz);
+		if (jd->buf == NULL)
+			return NULL;
+
+		jd->bufsize = sz;
+	}
+
+	prefix = jd->buf;
+
+	ret = fread(prefix, sizeof(*prefix), 1, jd->in);
+	if (ret  != 1)
+		return NULL;
+
+	if (jd->needs_bswap) {
+		prefix->id   	   = bswap_32(prefix->id);
+		prefix->total_size = bswap_32(prefix->total_size);
+		prefix->timestamp  = bswap_64(prefix->timestamp);
+	}
+	id   = prefix->id;
+	size = prefix->total_size;
+
+	bs = (size_t)size;
+	if (bs < sizeof(*prefix))
+		return NULL;
+
+	if (id >= JIT_CODE_MAX) {
+		pr_warning("next_entry: unknown prefix %d, skipping\n", id);
+		return NULL;
+	}
+	if (bs > jd->bufsize) {
+		void *n;
+		n = realloc(jd->buf, bs);
+		if (!n)
+			return NULL;
+		jd->buf = n;
+		jd->bufsize = bs;
+	}
+
+	addr = ((void *)jd->buf) + sizeof(*prefix);
+
+	ret = fread(addr, bs - sizeof(*prefix), 1, jd->in);
+	if (ret != 1)
+		return NULL;
+
+	jr = (union jr_entry *)jd->buf;
+
+	switch(id) {
+	case JIT_CODE_DEBUG_INFO:
+	case JIT_CODE_CLOSE:
+		break;
+	case JIT_CODE_LOAD:
+		if (jd->needs_bswap) {
+			jr->load.pid       = bswap_32(jr->load.pid);
+			jr->load.tid       = bswap_32(jr->load.tid);
+			jr->load.vma       = bswap_64(jr->load.vma);
+			jr->load.code_addr = bswap_64(jr->load.code_addr);
+			jr->load.code_size = bswap_64(jr->load.code_size);
+			jr->load.code_index= bswap_64(jr->load.code_index);
+		}
+		jd->code_load_count++;
+		break;
+	case JIT_CODE_MOVE:
+		if (jd->needs_bswap) {
+			jr->move.pid           = bswap_32(jr->move.pid);
+			jr->move.tid           = bswap_32(jr->move.tid);
+			jr->move.vma           = bswap_64(jr->move.vma);
+			jr->move.old_code_addr = bswap_64(jr->move.old_code_addr);
+			jr->move.new_code_addr = bswap_64(jr->move.new_code_addr);
+			jr->move.code_size     = bswap_64(jr->move.code_size);
+			jr->move.code_index    = bswap_64(jr->move.code_index);
+		}
+		break;
+	case JIT_CODE_MAX:
+	default:
+		return NULL;
+	}
+	return jr;
+}
+
+union jr_entry *
+jit_get_next_entry_type(struct jit_buf_desc *jd, int type)
+{
+	union jr_entry *jr;
+
+	while ((jr = jit_get_next_entry(jd))) {
+		if (type == -1 || (uint32_t)type == jr->prefix.id)
+			goto found;
+	}
+	return NULL;
+found:
+	switch(jr->prefix.id) {
+	case JIT_CODE_DEBUG_INFO:
+	case JIT_CODE_CLOSE:
+		break;
+	case JIT_CODE_LOAD:
+		if (jd->needs_bswap) {
+			jr->load.pid       = bswap_32(jr->load.pid);
+			jr->load.tid       = bswap_32(jr->load.tid);
+			jr->load.vma       = bswap_64(jr->load.vma);
+			jr->load.code_addr = bswap_64(jr->load.code_addr);
+			jr->load.code_size = bswap_32(jr->load.code_size);
+			jr->load.code_index= bswap_64(jr->load.code_index);
+		}
+		jd->code_load_count++;
+		break;
+	case JIT_CODE_MAX:
+	default:
+		return NULL;
+	}
+	return jr;
+}
diff --git a/tools/perf/util/jitdump.h b/tools/perf/util/jitdump.h
new file mode 100644
index 0000000..120bdcf
--- /dev/null
+++ b/tools/perf/util/jitdump.h
@@ -0,0 +1,92 @@
+/*
+ * jitdump.h: jitted code info encapsulation file format
+ *
+ * Adapted from OProfile GPLv2 support jidump.h:
+ * Copyright 2007 OProfile authors
+ * Jens Wilke
+ * Daniel Hansel
+ * Copyright IBM Corporation 2007
+ */
+#ifndef JITDUMP_H
+#define JITDUMP_H
+
+#include <sys/time.h>
+#include <time.h>
+#include <stdint.h>
+
+/* JiTD */
+#define JITHEADER_MAGIC		0x4A695444
+#define JITHEADER_MAGIC_SW	0x4454694A
+
+#define PADDING_8ALIGNED(x) ((((x) + 7) & 7) ^ 7)
+
+#define JITHEADER_VERSION 1
+
+struct jitheader {
+	uint32_t magic;		/* characters "jItD" */
+	uint32_t version;	/* header version */
+	uint32_t total_size;	/* total size of header */
+	uint32_t elf_mach;	/* elf mach target */
+	uint32_t pad1;		/* reserved */
+	uint32_t pid;		/* JIT process id */
+	uint64_t timestamp;	/* timestamp */
+};
+
+enum jit_record_type {
+	JIT_CODE_LOAD		= 0,
+        JIT_CODE_MOVE           = 1,
+	JIT_CODE_DEBUG_INFO	= 2,
+	JIT_CODE_CLOSE		= 3,
+
+	JIT_CODE_MAX,
+};
+
+/* record prefix (mandatory in each record) */
+struct jr_prefix {
+	uint32_t id;
+	uint32_t total_size;
+	uint64_t timestamp;
+};
+
+struct jr_code_load {
+	struct jr_prefix p;
+
+	uint32_t pid;
+	uint32_t tid;
+	uint64_t vma;
+	uint64_t code_addr;
+	uint64_t code_size;
+	uint64_t code_index;
+};
+
+struct jr_code_close {
+	struct jr_prefix p;
+};
+
+struct jr_code_move {
+	struct jr_prefix p;
+
+	uint32_t pid;
+	uint32_t tid;
+	uint64_t vma;
+	uint64_t old_code_addr;
+	uint64_t new_code_addr;
+	uint64_t code_size;
+	uint64_t code_index;
+};
+
+struct jr_code_debug_info {
+	struct jr_prefix p;
+
+	uint64_t code_addr;
+	uint64_t nr_entry;
+};
+
+union jr_entry {
+        struct jr_code_debug_info info;
+        struct jr_code_close close;
+        struct jr_code_load load;
+        struct jr_code_move move;
+        struct jr_prefix prefix;
+};
+#endif /* !JITDUMP_H */
-- 
1.9.1

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