[mirror_ubuntu-eoan-kernel.git] / tools / perf / util / jitdump.c

// SPDX-License-Identifier: GPL-2.0
#include <sys/sysmacros.h>
#include <sys/types.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <inttypes.h>
#include <byteswap.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <linux/stringify.h>

#include "util.h"
#include "event.h"
#include "debug.h"
#include "evlist.h"
#include "symbol.h"
#include <elf.h>

#include "tsc.h"
#include "session.h"
#include "jit.h"
#include "jitdump.h"
#include "genelf.h"
#include "../builtin.h"

#include "sane_ctype.h"

struct jit_buf_desc {
	struct perf_data_file *output;
	struct perf_session *session;
	struct machine *machine;
	union jr_entry   *entry;
	void             *buf;
	uint64_t	 sample_type;
	size_t           bufsize;
	FILE             *in;
	bool		 needs_bswap; /* handles cross-endianess */
	bool		 use_arch_timestamp;
	void		 *debug_data;
	void		 *unwinding_data;
	uint64_t	 unwinding_size;
	uint64_t	 unwinding_mapped_size;
	uint64_t         eh_frame_hdr_size;
	size_t		 nr_debug_entries;
	uint32_t         code_load_count;
	u64		 bytes_written;
	struct rb_root   code_root;
	char		 dir[PATH_MAX];
};

struct debug_line_info {
	unsigned long vma;
	unsigned int lineno;
	/* The filename format is unspecified, absolute path, relative etc. */
	char const filename[0];
};

struct jit_tool {
	struct perf_tool tool;
	struct perf_data_file	output;
	struct perf_data_file	input;
	u64 bytes_written;
};

#define hmax(a, b) ((a) > (b) ? (a) : (b))
#define get_jit_tool(t) (container_of(tool, struct jit_tool, tool))

static int
jit_emit_elf(char *filename,
	     const char *sym,
	     uint64_t code_addr,
	     const void *code,
	     int csize,
	     void *debug,
	     int nr_debug_entries,
	     void *unwinding,
	     uint32_t unwinding_header_size,
	     uint32_t unwinding_size)
{
	int ret, fd;

	if (verbose > 0)
		fprintf(stderr, "write ELF image %s\n", filename);

	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, code_addr, sym, (const void *)code, csize, debug, nr_debug_entries,
			    unwinding, unwinding_header_size, unwinding_size);

        close(fd);

        if (ret)
                unlink(filename);

	return ret;
}

static void
jit_close(struct jit_buf_desc *jd)
{
	if (!(jd && jd->in))
		return;
	funlockfile(jd->in);
	fclose(jd->in);
	jd->in = NULL;
}

static int
jit_validate_events(struct perf_session *session)
{
	struct perf_evsel *evsel;

	/*
	 * check that all events use CLOCK_MONOTONIC
	 */
	evlist__for_each_entry(session->evlist, evsel) {
		if (evsel->attr.use_clockid == 0 || evsel->attr.clockid != CLOCK_MONOTONIC)
			return -1;
	}
	return 0;
}

static int
jit_open(struct jit_buf_desc *jd, const char *name)
{
	struct jitheader header;
	struct jr_prefix *prefix;
	ssize_t bs, bsz = 0;
	void *n, *buf = NULL;
	int ret, retval = -1;

	jd->in = fopen(name, "r");
	if (!jd->in)
		return -1;

	bsz = hmax(sizeof(header), sizeof(*prefix));

	buf = malloc(bsz);
	if (!buf)
		goto error;

	/*
	 * protect from writer modifying the file while we are reading it
	 */
	flockfile(jd->in);

	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 = true;
	}

	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_64(header.timestamp);
		header.flags      = bswap_64(header.flags);
	}

	jd->use_arch_timestamp = header.flags & JITDUMP_FLAGS_ARCH_TIMESTAMP;

	if (verbose > 2)
		pr_debug("version=%u\nhdr.size=%u\nts=0x%llx\npid=%d\nelf_mach=%d\nuse_arch_timestamp=%d\n",
			header.version,
			header.total_size,
			(unsigned long long)header.timestamp,
			header.pid,
			header.elf_mach,
			jd->use_arch_timestamp);

	if (header.version > JITHEADER_VERSION) {
		pr_err("wrong jitdump version %u, expected " __stringify(JITHEADER_VERSION),
			header.version);
		goto error;
	}

	if (header.flags & JITDUMP_FLAGS_RESERVED) {
		pr_err("jitdump file contains invalid or unsupported flags 0x%llx\n",
		       (unsigned long long)header.flags & JITDUMP_FLAGS_RESERVED);
		goto error;
	}

	if (jd->use_arch_timestamp && !jd->session->time_conv.time_mult) {
		pr_err("jitdump file uses arch timestamps but there is no timestamp conversion\n");
		goto error;
	}

	/*
	 * validate event is using the correct clockid
	 */
	if (!jd->use_arch_timestamp && jit_validate_events(jd->session)) {
		pr_err("error, jitted code must be sampled with perf record -k 1\n");
		goto error;
	}

	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;
	}
	/*
	 * keep dirname for generating files and mmap records
	 */
	strcpy(jd->dir, name);
	dirname(jd->dir);

	return 0;
error:
	funlockfile(jd->in);
	fclose(jd->in);
	return retval;
}

static 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;

	/*
	 * file is still locked at this point
	 */
	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 record type %d, skipping\n", id);
	}
	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:
		if (jd->needs_bswap) {
			uint64_t n;
			jr->info.code_addr = bswap_64(jr->info.code_addr);
			jr->info.nr_entry  = bswap_64(jr->info.nr_entry);
			for (n = 0 ; n < jr->info.nr_entry; n++) {
				jr->info.entries[n].addr    = bswap_64(jr->info.entries[n].addr);
				jr->info.entries[n].lineno  = bswap_32(jr->info.entries[n].lineno);
				jr->info.entries[n].discrim = bswap_32(jr->info.entries[n].discrim);
			}
		}
		break;
	case JIT_CODE_UNWINDING_INFO:
		if (jd->needs_bswap) {
			jr->unwinding.unwinding_size = bswap_64(jr->unwinding.unwinding_size);
			jr->unwinding.eh_frame_hdr_size = bswap_64(jr->unwinding.eh_frame_hdr_size);
			jr->unwinding.mapped_size = bswap_64(jr->unwinding.mapped_size);
		}
		break;
	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:
		/* skip unknown record (we have read them) */
		break;
	}
	return jr;
}

static int
jit_inject_event(struct jit_buf_desc *jd, union perf_event *event)
{
	ssize_t size;

	size = perf_data_file__write(jd->output, event, event->header.size);
	if (size < 0)
		return -1;

	jd->bytes_written += size;
	return 0;
}

static uint64_t convert_timestamp(struct jit_buf_desc *jd, uint64_t timestamp)
{
	struct perf_tsc_conversion tc;

	if (!jd->use_arch_timestamp)
		return timestamp;

	tc.time_shift = jd->session->time_conv.time_shift;
	tc.time_mult  = jd->session->time_conv.time_mult;
	tc.time_zero  = jd->session->time_conv.time_zero;

	if (!tc.time_mult)
		return 0;

	return tsc_to_perf_time(timestamp, &tc);
}

static int jit_repipe_code_load(struct jit_buf_desc *jd, union jr_entry *jr)
{
	struct perf_sample sample;
	union perf_event *event;
	struct perf_tool *tool = jd->session->tool;
	uint64_t code, addr;
	uintptr_t uaddr;
	char *filename;
	struct stat st;
	size_t size;
	u16 idr_size;
	const char *sym;
	uint32_t count;
	int ret, csize, usize;
	pid_t pid, tid;
	struct {
		u32 pid, tid;
		u64 time;
	} *id;

	pid   = jr->load.pid;
	tid   = jr->load.tid;
	csize = jr->load.code_size;
	usize = jd->unwinding_mapped_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;
	idr_size = jd->machine->id_hdr_size;

	event = calloc(1, sizeof(*event) + idr_size);
	if (!event)
		return -1;

	filename = event->mmap2.filename;
	size = snprintf(filename, PATH_MAX, "%s/jitted-%d-%u.so",
			jd->dir,
			pid,
			count);

	size++; /* for \0 */

	size = PERF_ALIGN(size, sizeof(u64));
	uaddr = (uintptr_t)code;
	ret = jit_emit_elf(filename, sym, addr, (const void *)uaddr, csize, jd->debug_data, jd->nr_debug_entries,
			   jd->unwinding_data, jd->eh_frame_hdr_size, jd->unwinding_size);

	if (jd->debug_data && jd->nr_debug_entries) {
		free(jd->debug_data);
		jd->debug_data = NULL;
		jd->nr_debug_entries = 0;
	}

	if (jd->unwinding_data && jd->eh_frame_hdr_size) {
		free(jd->unwinding_data);
		jd->unwinding_data = NULL;
		jd->eh_frame_hdr_size = 0;
		jd->unwinding_mapped_size = 0;
		jd->unwinding_size = 0;
	}

	if (ret) {
		free(event);
		return -1;
	}
	if (stat(filename, &st))
		memset(&st, 0, sizeof(st));

	event->mmap2.header.type = PERF_RECORD_MMAP2;
	event->mmap2.header.misc = PERF_RECORD_MISC_USER;
	event->mmap2.header.size = (sizeof(event->mmap2) -
			(sizeof(event->mmap2.filename) - size) + idr_size);

	event->mmap2.pgoff = GEN_ELF_TEXT_OFFSET;
	event->mmap2.start = addr;
	event->mmap2.len   = usize ? ALIGN_8(csize) + usize : csize;
	event->mmap2.pid   = pid;
	event->mmap2.tid   = tid;
	event->mmap2.ino   = st.st_ino;
	event->mmap2.maj   = major(st.st_dev);
	event->mmap2.min   = minor(st.st_dev);
	event->mmap2.prot  = st.st_mode;
	event->mmap2.flags = MAP_SHARED;
	event->mmap2.ino_generation = 1;

	id = (void *)((unsigned long)event + event->mmap.header.size - idr_size);
	if (jd->sample_type & PERF_SAMPLE_TID) {
		id->pid  = pid;
		id->tid  = tid;
	}
	if (jd->sample_type & PERF_SAMPLE_TIME)
		id->time = convert_timestamp(jd, jr->load.p.timestamp);

	/*
	 * create pseudo sample to induce dso hit increment
	 * use first address as sample address
	 */
	memset(&sample, 0, sizeof(sample));
	sample.cpumode = PERF_RECORD_MISC_USER;
	sample.pid  = pid;
	sample.tid  = tid;
	sample.time = id->time;
	sample.ip   = addr;

	ret = perf_event__process_mmap2(tool, event, &sample, jd->machine);
	if (ret)
		return ret;

	ret = jit_inject_event(jd, event);
	/*
	 * mark dso as use to generate buildid in the header
	 */
	if (!ret)
		build_id__mark_dso_hit(tool, event, &sample, NULL, jd->machine);

	return ret;
}

static int jit_repipe_code_move(struct jit_buf_desc *jd, union jr_entry *jr)
{
	struct perf_sample sample;
	union perf_event *event;
	struct perf_tool *tool = jd->session->tool;
	char *filename;
	size_t size;
	struct stat st;
	int usize;
	u16 idr_size;
	int ret;
	pid_t pid, tid;
	struct {
		u32 pid, tid;
		u64 time;
	} *id;

	pid = jr->move.pid;
	tid =  jr->move.tid;
	usize = jd->unwinding_mapped_size;
	idr_size = jd->machine->id_hdr_size;

	/*
	 * +16 to account for sample_id_all (hack)
	 */
	event = calloc(1, sizeof(*event) + 16);
	if (!event)
		return -1;

	filename = event->mmap2.filename;
	size = snprintf(filename, PATH_MAX, "%s/jitted-%d-%"PRIu64,
	         jd->dir,
	         pid,
		 jr->move.code_index);

	size++; /* for \0 */

	if (stat(filename, &st))
		memset(&st, 0, sizeof(st));

	size = PERF_ALIGN(size, sizeof(u64));

	event->mmap2.header.type = PERF_RECORD_MMAP2;
	event->mmap2.header.misc = PERF_RECORD_MISC_USER;
	event->mmap2.header.size = (sizeof(event->mmap2) -
			(sizeof(event->mmap2.filename) - size) + idr_size);
	event->mmap2.pgoff = GEN_ELF_TEXT_OFFSET;
	event->mmap2.start = jr->move.new_code_addr;
	event->mmap2.len   = usize ? ALIGN_8(jr->move.code_size) + usize
				   : jr->move.code_size;
	event->mmap2.pid   = pid;
	event->mmap2.tid   = tid;
	event->mmap2.ino   = st.st_ino;
	event->mmap2.maj   = major(st.st_dev);
	event->mmap2.min   = minor(st.st_dev);
	event->mmap2.prot  = st.st_mode;
	event->mmap2.flags = MAP_SHARED;
	event->mmap2.ino_generation = 1;

	id = (void *)((unsigned long)event + event->mmap.header.size - idr_size);
	if (jd->sample_type & PERF_SAMPLE_TID) {
		id->pid  = pid;
		id->tid  = tid;
	}
	if (jd->sample_type & PERF_SAMPLE_TIME)
		id->time = convert_timestamp(jd, jr->load.p.timestamp);

	/*
	 * create pseudo sample to induce dso hit increment
	 * use first address as sample address
	 */
	memset(&sample, 0, sizeof(sample));
	sample.cpumode = PERF_RECORD_MISC_USER;
	sample.pid  = pid;
	sample.tid  = tid;
	sample.time = id->time;
	sample.ip   = jr->move.new_code_addr;

	ret = perf_event__process_mmap2(tool, event, &sample, jd->machine);
	if (ret)
		return ret;

	ret = jit_inject_event(jd, event);
	if (!ret)
		build_id__mark_dso_hit(tool, event, &sample, NULL, jd->machine);

	return ret;
}

static int jit_repipe_debug_info(struct jit_buf_desc *jd, union jr_entry *jr)
{
	void *data;
	size_t sz;

	if (!(jd && jr))
		return -1;

	sz  = jr->prefix.total_size - sizeof(jr->info);
	data = malloc(sz);
	if (!data)
		return -1;

	memcpy(data, &jr->info.entries, sz);

	jd->debug_data       = data;

	/*
	 * we must use nr_entry instead of size here because
	 * we cannot distinguish actual entry from padding otherwise
	 */
	jd->nr_debug_entries = jr->info.nr_entry;

	return 0;
}

static int
jit_repipe_unwinding_info(struct jit_buf_desc *jd, union jr_entry *jr)
{
	void *unwinding_data;
	uint32_t unwinding_data_size;

	if (!(jd && jr))
		return -1;

	unwinding_data_size  = jr->prefix.total_size - sizeof(jr->unwinding);
	unwinding_data = malloc(unwinding_data_size);
	if (!unwinding_data)
		return -1;

	memcpy(unwinding_data, &jr->unwinding.unwinding_data,
	       unwinding_data_size);

	jd->eh_frame_hdr_size = jr->unwinding.eh_frame_hdr_size;
	jd->unwinding_size = jr->unwinding.unwinding_size;
	jd->unwinding_mapped_size = jr->unwinding.mapped_size;
	jd->unwinding_data = unwinding_data;

	return 0;
}

static int
jit_process_dump(struct jit_buf_desc *jd)
{
	union jr_entry *jr;
	int ret = 0;

	while ((jr = jit_get_next_entry(jd))) {
		switch(jr->prefix.id) {
		case JIT_CODE_LOAD:
			ret = jit_repipe_code_load(jd, jr);
			break;
		case JIT_CODE_MOVE:
			ret = jit_repipe_code_move(jd, jr);
			break;
		case JIT_CODE_DEBUG_INFO:
			ret = jit_repipe_debug_info(jd, jr);
			break;
		case JIT_CODE_UNWINDING_INFO:
			ret = jit_repipe_unwinding_info(jd, jr);
			break;
		default:
			ret = 0;
			continue;
		}
	}
	return ret;
}

static int
jit_inject(struct jit_buf_desc *jd, char *path)
{
	int ret;

	if (verbose > 0)
		fprintf(stderr, "injecting: %s\n", path);

	ret = jit_open(jd, path);
	if (ret)
		return -1;

	ret = jit_process_dump(jd);

	jit_close(jd);

	if (verbose > 0)
		fprintf(stderr, "injected: %s (%d)\n", path, ret);

	return 0;
}

/*
 * File must be with pattern .../jit-XXXX.dump
 * where XXXX is the PID of the process which did the mmap()
 * as captured in the RECORD_MMAP record
 */
static int
jit_detect(char *mmap_name, pid_t pid)
 {
	char *p;
	char *end = NULL;
	pid_t pid2;

	if (verbose > 2)
		fprintf(stderr, "jit marker trying : %s\n", mmap_name);
	/*
	 * get file name
	 */
	p = strrchr(mmap_name, '/');
	if (!p)
		return -1;

	/*
	 * match prefix
	 */
	if (strncmp(p, "/jit-", 5))
		return -1;

	/*
	 * skip prefix
	 */
	p += 5;

	/*
	 * must be followed by a pid
	 */
	if (!isdigit(*p))
		return -1;

	pid2 = (int)strtol(p, &end, 10);
	if (!end)
		return -1;

	/*
	 * pid does not match mmap pid
	 * pid==0 in system-wide mode (synthesized)
	 */
	if (pid && pid2 != pid)
		return -1;
	/*
	 * validate suffix
	 */
	if (strcmp(end, ".dump"))
		return -1;

	if (verbose > 0)
		fprintf(stderr, "jit marker found: %s\n", mmap_name);

	return 0;
}

int
jit_process(struct perf_session *session,
	    struct perf_data_file *output,
	    struct machine *machine,
	    char *filename,
	    pid_t pid,
	    u64 *nbytes)
{
	struct perf_evsel *first;
	struct jit_buf_desc jd;
	int ret;

	/*
	 * first, detect marker mmap (i.e., the jitdump mmap)
	 */
	if (jit_detect(filename, pid))
		return 0;

	memset(&jd, 0, sizeof(jd));

	jd.session = session;
	jd.output  = output;
	jd.machine = machine;

	/*
	 * track sample_type to compute id_all layout
	 * perf sets the same sample type to all events as of now
	 */
	first = perf_evlist__first(session->evlist);
	jd.sample_type = first->attr.sample_type;

	*nbytes = 0;

	ret = jit_inject(&jd, filename);
	if (!ret) {
		*nbytes = jd.bytes_written;
		ret = 1;
	}

	return ret;
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
49a7f010	2	#include <sys/sysmacros.h>
9b07e27f	3	#include <sys/types.h>
a43783ae	4	#include <errno.h>
9b07e27f SE	5	#include <stdio.h>
	6	#include <stdlib.h>
	7	#include <string.h>
	8	#include <fcntl.h>
	9	#include <unistd.h>
	10	#include <inttypes.h>
	11	#include <byteswap.h>
	12	#include <sys/stat.h>
	13	#include <sys/mman.h>
aa8cc2f6	14	#include <linux/stringify.h>
9b07e27f SE	15
	16	#include "util.h"
	17	#include "event.h"
	18	#include "debug.h"
	19	#include "evlist.h"
	20	#include "symbol.h"
9b07e27f SE	21	#include <elf.h>
9b07e27f SE	22
2a28e230	23	#include "tsc.h"
9b07e27f SE	24	#include "session.h"
	25	#include "jit.h"
	26	#include "jitdump.h"
	27	#include "genelf.h"
	28	#include "../builtin.h"
	29
3d689ed6 ACM	30	#include "sane_ctype.h"
3d689ed6 ACM	31
9b07e27f SE	32	struct jit_buf_desc {
	33	struct perf_data_file *output;
	34	struct perf_session *session;
	35	struct machine *machine;
	36	union jr_entry *entry;
	37	void *buf;
	38	uint64_t sample_type;
	39	size_t bufsize;
	40	FILE *in;
	41	bool needs_bswap; /* handles cross-endianess */
2a28e230	42	bool use_arch_timestamp;
9b07e27f	43	void *debug_data;
0284fecd SS	44	void *unwinding_data;
	45	uint64_t unwinding_size;
	46	uint64_t unwinding_mapped_size;
	47	uint64_t eh_frame_hdr_size;
9b07e27f SE	48	size_t nr_debug_entries;
	49	uint32_t code_load_count;
	50	u64 bytes_written;
	51	struct rb_root code_root;
	52	char dir[PATH_MAX];
	53	};
	54
	55	struct debug_line_info {
	56	unsigned long vma;
	57	unsigned int lineno;
	58	/* The filename format is unspecified, absolute path, relative etc. */
	59	char const filename[0];
	60	};
	61
	62	struct jit_tool {
	63	struct perf_tool tool;
	64	struct perf_data_file output;
	65	struct perf_data_file input;
	66	u64 bytes_written;
	67	};
	68
	69	#define hmax(a, b) ((a) > (b) ? (a) : (b))
	70	#define get_jit_tool(t) (container_of(tool, struct jit_tool, tool))
	71
	72	static int
	73	jit_emit_elf(char *filename,
	74	const char *sym,
	75	uint64_t code_addr,
	76	const void *code,
598b7c69 SE	77	int csize,
598b7c69 SE	78	void *debug,
086f9f3d SS	79	int nr_debug_entries,
	80	void *unwinding,
	81	uint32_t unwinding_header_size,
	82	uint32_t unwinding_size)
9b07e27f SE	83	{
	84	int ret, fd;
	85
	86	if (verbose > 0)
	87	fprintf(stderr, "write ELF image %s\n", filename);
	88
	89	fd = open(filename, O_CREAT\|O_TRUNC\|O_WRONLY, 0644);
	90	if (fd == -1) {
	91	pr_warning("cannot create jit ELF %s: %s\n", filename, strerror(errno));
	92	return -1;
	93	}
	94
086f9f3d SS	95	ret = jit_write_elf(fd, code_addr, sym, (const void *)code, csize, debug, nr_debug_entries,
086f9f3d SS	96	unwinding, unwinding_header_size, unwinding_size);
9b07e27f SE	97
	98	close(fd);
	99
	100	if (ret)
	101	unlink(filename);
	102
	103	return ret;
	104	}
	105
	106	static void
	107	jit_close(struct jit_buf_desc *jd)
	108	{
	109	if (!(jd && jd->in))
	110	return;
	111	funlockfile(jd->in);
	112	fclose(jd->in);
	113	jd->in = NULL;
	114	}
	115
4a018cc4 AH	116	static int
	117	jit_validate_events(struct perf_session *session)
	118	{
	119	struct perf_evsel *evsel;
	120
	121	/*
	122	* check that all events use CLOCK_MONOTONIC
	123	*/
e5cadb93	124	evlist__for_each_entry(session->evlist, evsel) {
4a018cc4 AH	125	if (evsel->attr.use_clockid == 0 \|\| evsel->attr.clockid != CLOCK_MONOTONIC)
	126	return -1;
	127	}
	128	return 0;
	129	}
	130
9b07e27f SE	131	static int
	132	jit_open(struct jit_buf_desc jd, const char name)
	133	{
	134	struct jitheader header;
	135	struct jr_prefix *prefix;
	136	ssize_t bs, bsz = 0;
	137	void n, buf = NULL;
	138	int ret, retval = -1;
	139
	140	jd->in = fopen(name, "r");
	141	if (!jd->in)
	142	return -1;
	143
	144	bsz = hmax(sizeof(header), sizeof(*prefix));
	145
	146	buf = malloc(bsz);
	147	if (!buf)
	148	goto error;
	149
	150	/*
	151	* protect from writer modifying the file while we are reading it
	152	*/
	153	flockfile(jd->in);
	154
	155	ret = fread(buf, sizeof(header), 1, jd->in);
	156	if (ret != 1)
	157	goto error;
	158
	159	memcpy(&header, buf, sizeof(header));
	160
	161	if (header.magic != JITHEADER_MAGIC) {
	162	if (header.magic != JITHEADER_MAGIC_SW)
	163	goto error;
	164	jd->needs_bswap = true;
	165	}
	166
	167	if (jd->needs_bswap) {
	168	header.version = bswap_32(header.version);
	169	header.total_size = bswap_32(header.total_size);
	170	header.pid = bswap_32(header.pid);
	171	header.elf_mach = bswap_32(header.elf_mach);
	172	header.timestamp = bswap_64(header.timestamp);
	173	header.flags = bswap_64(header.flags);
	174	}
	175
2a28e230 AH	176	jd->use_arch_timestamp = header.flags & JITDUMP_FLAGS_ARCH_TIMESTAMP;
2a28e230 AH	177
9b07e27f	178	if (verbose > 2)
2a28e230	179	pr_debug("version=%u\nhdr.size=%u\nts=0x%llx\npid=%d\nelf_mach=%d\nuse_arch_timestamp=%d\n",
9b07e27f SE	180	header.version,
	181	header.total_size,
	182	(unsigned long long)header.timestamp,
	183	header.pid,
2a28e230 AH	184	header.elf_mach,
2a28e230 AH	185	jd->use_arch_timestamp);
9b07e27f	186
6760d77b	187	if (header.version > JITHEADER_VERSION) {
aa8cc2f6	188	pr_err("wrong jitdump version %u, expected " __stringify(JITHEADER_VERSION),
6760d77b SS	189	header.version);
	190	goto error;
	191	}
	192
9b07e27f SE	193	if (header.flags & JITDUMP_FLAGS_RESERVED) {
	194	pr_err("jitdump file contains invalid or unsupported flags 0x%llx\n",
	195	(unsigned long long)header.flags & JITDUMP_FLAGS_RESERVED);
	196	goto error;
	197	}
	198
2a28e230 AH	199	if (jd->use_arch_timestamp && !jd->session->time_conv.time_mult) {
	200	pr_err("jitdump file uses arch timestamps but there is no timestamp conversion\n");
	201	goto error;
	202	}
	203
4a018cc4 AH	204	/*
	205	* validate event is using the correct clockid
	206	*/
2a28e230	207	if (!jd->use_arch_timestamp && jit_validate_events(jd->session)) {
4a018cc4 AH	208	pr_err("error, jitted code must be sampled with perf record -k 1\n");
	209	goto error;
	210	}
	211
9b07e27f SE	212	bs = header.total_size - sizeof(header);
	213
	214	if (bs > bsz) {
	215	n = realloc(buf, bs);
	216	if (!n)
	217	goto error;
	218	bsz = bs;
	219	buf = n;
	220	/* read extra we do not know about */
	221	ret = fread(buf, bs - bsz, 1, jd->in);
	222	if (ret != 1)
	223	goto error;
	224	}
	225	/*
	226	* keep dirname for generating files and mmap records
	227	*/
	228	strcpy(jd->dir, name);
	229	dirname(jd->dir);
	230
	231	return 0;
	232	error:
	233	funlockfile(jd->in);
	234	fclose(jd->in);
	235	return retval;
	236	}
	237
	238	static union jr_entry *
	239	jit_get_next_entry(struct jit_buf_desc *jd)
	240	{
	241	struct jr_prefix *prefix;
	242	union jr_entry *jr;
	243	void *addr;
	244	size_t bs, size;
	245	int id, ret;
	246
	247	if (!(jd && jd->in))
	248	return NULL;
	249
	250	if (jd->buf == NULL) {
	251	size_t sz = getpagesize();
	252	if (sz < sizeof(*prefix))
	253	sz = sizeof(*prefix);
	254
	255	jd->buf = malloc(sz);
	256	if (jd->buf == NULL)
	257	return NULL;
	258
	259	jd->bufsize = sz;
	260	}
	261
	262	prefix = jd->buf;
	263
	264	/*
	265	* file is still locked at this point
	266	*/
	267	ret = fread(prefix, sizeof(*prefix), 1, jd->in);
	268	if (ret != 1)
	269	return NULL;
	270
	271	if (jd->needs_bswap) {
	272	prefix->id = bswap_32(prefix->id);
	273	prefix->total_size = bswap_32(prefix->total_size);
	274	prefix->timestamp = bswap_64(prefix->timestamp);
	275	}
276	id = prefix->id;
277	size = prefix->total_size;
278
279	bs = (size_t)size;
280	if (bs < sizeof(*prefix))
281	return NULL;
282
283	if (id >= JIT_CODE_MAX) {
7354ec7a	284	pr_warning("next_entry: unknown record type %d, skipping\n", id);
9b07e27f SE	285	}
	286	if (bs > jd->bufsize) {
	287	void *n;
	288	n = realloc(jd->buf, bs);
	289	if (!n)
	290	return NULL;
	291	jd->buf = n;
	292	jd->bufsize = bs;
	293	}
	294
	295	addr = ((void )jd->buf) + sizeof(prefix);
	296
	297	ret = fread(addr, bs - sizeof(*prefix), 1, jd->in);
	298	if (ret != 1)
	299	return NULL;
	300
	301	jr = (union jr_entry *)jd->buf;
	302
	303	switch(id) {
	304	case JIT_CODE_DEBUG_INFO:
	305	if (jd->needs_bswap) {
	306	uint64_t n;
	307	jr->info.code_addr = bswap_64(jr->info.code_addr);
	308	jr->info.nr_entry = bswap_64(jr->info.nr_entry);
	309	for (n = 0 ; n < jr->info.nr_entry; n++) {
	310	jr->info.entries[n].addr = bswap_64(jr->info.entries[n].addr);
	311	jr->info.entries[n].lineno = bswap_32(jr->info.entries[n].lineno);
	312	jr->info.entries[n].discrim = bswap_32(jr->info.entries[n].discrim);
	313	}
	314	}
	315	break;
0284fecd SS	316	case JIT_CODE_UNWINDING_INFO:
	317	if (jd->needs_bswap) {
	318	jr->unwinding.unwinding_size = bswap_64(jr->unwinding.unwinding_size);
	319	jr->unwinding.eh_frame_hdr_size = bswap_64(jr->unwinding.eh_frame_hdr_size);
	320	jr->unwinding.mapped_size = bswap_64(jr->unwinding.mapped_size);
	321	}
	322	break;
9b07e27f SE	323	case JIT_CODE_CLOSE:
	324	break;
	325	case JIT_CODE_LOAD:
	326	if (jd->needs_bswap) {
	327	jr->load.pid = bswap_32(jr->load.pid);
	328	jr->load.tid = bswap_32(jr->load.tid);
	329	jr->load.vma = bswap_64(jr->load.vma);
	330	jr->load.code_addr = bswap_64(jr->load.code_addr);
	331	jr->load.code_size = bswap_64(jr->load.code_size);
	332	jr->load.code_index= bswap_64(jr->load.code_index);
	333	}
	334	jd->code_load_count++;
	335	break;
	336	case JIT_CODE_MOVE:
	337	if (jd->needs_bswap) {
	338	jr->move.pid = bswap_32(jr->move.pid);
	339	jr->move.tid = bswap_32(jr->move.tid);
	340	jr->move.vma = bswap_64(jr->move.vma);
	341	jr->move.old_code_addr = bswap_64(jr->move.old_code_addr);
	342	jr->move.new_code_addr = bswap_64(jr->move.new_code_addr);
	343	jr->move.code_size = bswap_64(jr->move.code_size);
	344	jr->move.code_index = bswap_64(jr->move.code_index);
	345	}
	346	break;
	347	case JIT_CODE_MAX:
	348	default:
7354ec7a SS	349	/* skip unknown record (we have read them) */
7354ec7a SS	350	break;
9b07e27f SE	351	}
	352	return jr;
	353	}
	354
	355	static int
	356	jit_inject_event(struct jit_buf_desc jd, union perf_event event)
	357	{
	358	ssize_t size;
	359
	360	size = perf_data_file__write(jd->output, event, event->header.size);
	361	if (size < 0)
	362	return -1;
	363
	364	jd->bytes_written += size;
	365	return 0;
	366	}
	367
2a28e230 AH	368	static uint64_t convert_timestamp(struct jit_buf_desc *jd, uint64_t timestamp)
	369	{
	370	struct perf_tsc_conversion tc;
	371
	372	if (!jd->use_arch_timestamp)
	373	return timestamp;
	374
	375	tc.time_shift = jd->session->time_conv.time_shift;
	376	tc.time_mult = jd->session->time_conv.time_mult;
	377	tc.time_zero = jd->session->time_conv.time_zero;
	378
	379	if (!tc.time_mult)
	380	return 0;
	381
	382	return tsc_to_perf_time(timestamp, &tc);
	383	}
	384
9b07e27f SE	385	static int jit_repipe_code_load(struct jit_buf_desc jd, union jr_entry jr)
	386	{
	387	struct perf_sample sample;
	388	union perf_event *event;
	389	struct perf_tool *tool = jd->session->tool;
	390	uint64_t code, addr;
	391	uintptr_t uaddr;
	392	char *filename;
	393	struct stat st;
	394	size_t size;
	395	u16 idr_size;
	396	const char *sym;
	397	uint32_t count;
0284fecd	398	int ret, csize, usize;
9b07e27f SE	399	pid_t pid, tid;
	400	struct {
	401	u32 pid, tid;
	402	u64 time;
	403	} *id;
	404
	405	pid = jr->load.pid;
	406	tid = jr->load.tid;
	407	csize = jr->load.code_size;
0284fecd	408	usize = jd->unwinding_mapped_size;
9b07e27f SE	409	addr = jr->load.code_addr;
	410	sym = (void *)((unsigned long)jr + sizeof(jr->load));
	411	code = (unsigned long)jr + jr->load.p.total_size - csize;
	412	count = jr->load.code_index;
	413	idr_size = jd->machine->id_hdr_size;
	414
	415	event = calloc(1, sizeof(*event) + idr_size);
	416	if (!event)
	417	return -1;
	418
	419	filename = event->mmap2.filename;
	420	size = snprintf(filename, PATH_MAX, "%s/jitted-%d-%u.so",
	421	jd->dir,
	422	pid,
	423	count);
	424
	425	size++; /* for \0 */
	426
	427	size = PERF_ALIGN(size, sizeof(u64));
	428	uaddr = (uintptr_t)code;
086f9f3d SS	429	ret = jit_emit_elf(filename, sym, addr, (const void *)uaddr, csize, jd->debug_data, jd->nr_debug_entries,
086f9f3d SS	430	jd->unwinding_data, jd->eh_frame_hdr_size, jd->unwinding_size);
9b07e27f SE	431
	432	if (jd->debug_data && jd->nr_debug_entries) {
	433	free(jd->debug_data);
	434	jd->debug_data = NULL;
	435	jd->nr_debug_entries = 0;
	436	}
	437
0284fecd SS	438	if (jd->unwinding_data && jd->eh_frame_hdr_size) {
	439	free(jd->unwinding_data);
	440	jd->unwinding_data = NULL;
	441	jd->eh_frame_hdr_size = 0;
	442	jd->unwinding_mapped_size = 0;
	443	jd->unwinding_size = 0;
	444	}
	445
9b07e27f SE	446	if (ret) {
	447	free(event);
	448	return -1;
	449	}
	450	if (stat(filename, &st))
f56ebf20	451	memset(&st, 0, sizeof(st));
9b07e27f SE	452
	453	event->mmap2.header.type = PERF_RECORD_MMAP2;
	454	event->mmap2.header.misc = PERF_RECORD_MISC_USER;
	455	event->mmap2.header.size = (sizeof(event->mmap2) -
	456	(sizeof(event->mmap2.filename) - size) + idr_size);
	457
	458	event->mmap2.pgoff = GEN_ELF_TEXT_OFFSET;
	459	event->mmap2.start = addr;
0284fecd	460	event->mmap2.len = usize ? ALIGN_8(csize) + usize : csize;
9b07e27f SE	461	event->mmap2.pid = pid;
	462	event->mmap2.tid = tid;
	463	event->mmap2.ino = st.st_ino;
	464	event->mmap2.maj = major(st.st_dev);
	465	event->mmap2.min = minor(st.st_dev);
	466	event->mmap2.prot = st.st_mode;
	467	event->mmap2.flags = MAP_SHARED;
	468	event->mmap2.ino_generation = 1;
	469
	470	id = (void *)((unsigned long)event + event->mmap.header.size - idr_size);
	471	if (jd->sample_type & PERF_SAMPLE_TID) {
	472	id->pid = pid;
	473	id->tid = tid;
	474	}
	475	if (jd->sample_type & PERF_SAMPLE_TIME)
2a28e230	476	id->time = convert_timestamp(jd, jr->load.p.timestamp);
9b07e27f SE	477
	478	/*
	479	* create pseudo sample to induce dso hit increment
	480	* use first address as sample address
	481	*/
	482	memset(&sample, 0, sizeof(sample));
3ea223ad	483	sample.cpumode = PERF_RECORD_MISC_USER;
9b07e27f SE	484	sample.pid = pid;
	485	sample.tid = tid;
	486	sample.time = id->time;
	487	sample.ip = addr;
	488
	489	ret = perf_event__process_mmap2(tool, event, &sample, jd->machine);
	490	if (ret)
	491	return ret;
	492
	493	ret = jit_inject_event(jd, event);
	494	/*
	495	* mark dso as use to generate buildid in the header
	496	*/
	497	if (!ret)
	498	build_id__mark_dso_hit(tool, event, &sample, NULL, jd->machine);
	499
	500	return ret;
	501	}
	502
	503	static int jit_repipe_code_move(struct jit_buf_desc jd, union jr_entry jr)
	504	{
	505	struct perf_sample sample;
	506	union perf_event *event;
	507	struct perf_tool *tool = jd->session->tool;
	508	char *filename;
	509	size_t size;
	510	struct stat st;
0284fecd	511	int usize;
9b07e27f SE	512	u16 idr_size;
	513	int ret;
	514	pid_t pid, tid;
	515	struct {
	516	u32 pid, tid;
	517	u64 time;
	518	} *id;
	519
	520	pid = jr->move.pid;
	521	tid = jr->move.tid;
0284fecd	522	usize = jd->unwinding_mapped_size;
9b07e27f SE	523	idr_size = jd->machine->id_hdr_size;
	524
	525	/*
	526	* +16 to account for sample_id_all (hack)
	527	*/
	528	event = calloc(1, sizeof(*event) + 16);
	529	if (!event)
	530	return -1;
	531
	532	filename = event->mmap2.filename;
	533	size = snprintf(filename, PATH_MAX, "%s/jitted-%d-%"PRIu64,
	534	jd->dir,
	535	pid,
	536	jr->move.code_index);
	537
	538	size++; /* for \0 */
	539
	540	if (stat(filename, &st))
f56ebf20	541	memset(&st, 0, sizeof(st));
9b07e27f SE	542
	543	size = PERF_ALIGN(size, sizeof(u64));
	544
	545	event->mmap2.header.type = PERF_RECORD_MMAP2;
	546	event->mmap2.header.misc = PERF_RECORD_MISC_USER;
	547	event->mmap2.header.size = (sizeof(event->mmap2) -
	548	(sizeof(event->mmap2.filename) - size) + idr_size);
	549	event->mmap2.pgoff = GEN_ELF_TEXT_OFFSET;
	550	event->mmap2.start = jr->move.new_code_addr;
0284fecd SS	551	event->mmap2.len = usize ? ALIGN_8(jr->move.code_size) + usize
0284fecd SS	552	: jr->move.code_size;
9b07e27f SE	553	event->mmap2.pid = pid;
	554	event->mmap2.tid = tid;
	555	event->mmap2.ino = st.st_ino;
	556	event->mmap2.maj = major(st.st_dev);
	557	event->mmap2.min = minor(st.st_dev);
	558	event->mmap2.prot = st.st_mode;
	559	event->mmap2.flags = MAP_SHARED;
	560	event->mmap2.ino_generation = 1;
	561
	562	id = (void *)((unsigned long)event + event->mmap.header.size - idr_size);
	563	if (jd->sample_type & PERF_SAMPLE_TID) {
	564	id->pid = pid;
	565	id->tid = tid;
	566	}
	567	if (jd->sample_type & PERF_SAMPLE_TIME)
2a28e230	568	id->time = convert_timestamp(jd, jr->load.p.timestamp);
9b07e27f SE	569
	570	/*
	571	* create pseudo sample to induce dso hit increment
	572	* use first address as sample address
	573	*/
	574	memset(&sample, 0, sizeof(sample));
3ea223ad	575	sample.cpumode = PERF_RECORD_MISC_USER;
9b07e27f SE	576	sample.pid = pid;
	577	sample.tid = tid;
	578	sample.time = id->time;
	579	sample.ip = jr->move.new_code_addr;
	580
	581	ret = perf_event__process_mmap2(tool, event, &sample, jd->machine);
	582	if (ret)
	583	return ret;
	584
	585	ret = jit_inject_event(jd, event);
	586	if (!ret)
	587	build_id__mark_dso_hit(tool, event, &sample, NULL, jd->machine);
	588
	589	return ret;
	590	}
	591
	592	static int jit_repipe_debug_info(struct jit_buf_desc jd, union jr_entry jr)
	593	{
	594	void *data;
	595	size_t sz;
	596
	597	if (!(jd && jr))
	598	return -1;
	599
	600	sz = jr->prefix.total_size - sizeof(jr->info);
	601	data = malloc(sz);
	602	if (!data)
	603	return -1;
	604
	605	memcpy(data, &jr->info.entries, sz);
	606
	607	jd->debug_data = data;
	608
	609	/*
	610	* we must use nr_entry instead of size here because
	611	* we cannot distinguish actual entry from padding otherwise
	612	*/
	613	jd->nr_debug_entries = jr->info.nr_entry;
	614
	615	return 0;
	616	}
	617
0284fecd SS	618	static int
	619	jit_repipe_unwinding_info(struct jit_buf_desc jd, union jr_entry jr)
	620	{
	621	void *unwinding_data;
	622	uint32_t unwinding_data_size;
	623
	624	if (!(jd && jr))
	625	return -1;
	626
	627	unwinding_data_size = jr->prefix.total_size - sizeof(jr->unwinding);
	628	unwinding_data = malloc(unwinding_data_size);
	629	if (!unwinding_data)
	630	return -1;
	631
	632	memcpy(unwinding_data, &jr->unwinding.unwinding_data,
	633	unwinding_data_size);
	634
	635	jd->eh_frame_hdr_size = jr->unwinding.eh_frame_hdr_size;
	636	jd->unwinding_size = jr->unwinding.unwinding_size;
	637	jd->unwinding_mapped_size = jr->unwinding.mapped_size;
	638	jd->unwinding_data = unwinding_data;
	639
	640	return 0;
	641	}
	642
9b07e27f SE	643	static int
	644	jit_process_dump(struct jit_buf_desc *jd)
	645	{
	646	union jr_entry *jr;
ef2c3e76	647	int ret = 0;
9b07e27f SE	648
	649	while ((jr = jit_get_next_entry(jd))) {
	650	switch(jr->prefix.id) {
	651	case JIT_CODE_LOAD:
	652	ret = jit_repipe_code_load(jd, jr);
	653	break;
	654	case JIT_CODE_MOVE:
	655	ret = jit_repipe_code_move(jd, jr);
	656	break;
	657	case JIT_CODE_DEBUG_INFO:
	658	ret = jit_repipe_debug_info(jd, jr);
	659	break;
0284fecd SS	660	case JIT_CODE_UNWINDING_INFO:
	661	ret = jit_repipe_unwinding_info(jd, jr);
	662	break;
9b07e27f SE	663	default:
	664	ret = 0;
	665	continue;
	666	}
	667	}
	668	return ret;
	669	}
	670
	671	static int
	672	jit_inject(struct jit_buf_desc jd, char path)
	673	{
	674	int ret;
	675
	676	if (verbose > 0)
	677	fprintf(stderr, "injecting: %s\n", path);
	678
	679	ret = jit_open(jd, path);
	680	if (ret)
	681	return -1;
	682
	683	ret = jit_process_dump(jd);
	684
	685	jit_close(jd);
	686
	687	if (verbose > 0)
	688	fprintf(stderr, "injected: %s (%d)\n", path, ret);
	689
	690	return 0;
	691	}
	692
	693	/*
	694	* File must be with pattern .../jit-XXXX.dump
	695	* where XXXX is the PID of the process which did the mmap()
	696	* as captured in the RECORD_MMAP record
	697	*/
	698	static int
	699	jit_detect(char *mmap_name, pid_t pid)
	700	{
	701	char *p;
	702	char *end = NULL;
	703	pid_t pid2;
	704
	705	if (verbose > 2)
	706	fprintf(stderr, "jit marker trying : %s\n", mmap_name);
	707	/*
	708	* get file name
	709	*/
	710	p = strrchr(mmap_name, '/');
	711	if (!p)
	712	return -1;
	713
	714	/*
	715	* match prefix
	716	*/
	717	if (strncmp(p, "/jit-", 5))
	718	return -1;
	719
	720	/*
	721	* skip prefix
	722	*/
	723	p += 5;
	724
	725	/*
	726	* must be followed by a pid
727	*/
728	if (!isdigit(*p))
729	return -1;
730
731	pid2 = (int)strtol(p, &end, 10);
732	if (!end)
733	return -1;
734
735	/*
736	* pid does not match mmap pid
737	* pid==0 in system-wide mode (synthesized)
738	*/
739	if (pid && pid2 != pid)
740	return -1;
741	/*
742	* validate suffix
743	*/
744	if (strcmp(end, ".dump"))
745	return -1;
746
747	if (verbose > 0)
748	fprintf(stderr, "jit marker found: %s\n", mmap_name);
749
750	return 0;
751	}
752
753	int
754	jit_process(struct perf_session *session,
755	struct perf_data_file *output,
756	struct machine *machine,
757	char *filename,
758	pid_t pid,
759	u64 *nbytes)
760	{
761	struct perf_evsel *first;
762	struct jit_buf_desc jd;
763	int ret;
764
765	/*
766	* first, detect marker mmap (i.e., the jitdump mmap)
767	*/
768	if (jit_detect(filename, pid))
570735b3	769	return 0;
9b07e27f SE	770
	771	memset(&jd, 0, sizeof(jd));
	772
	773	jd.session = session;
	774	jd.output = output;
	775	jd.machine = machine;
	776
	777	/*
	778	* track sample_type to compute id_all layout
	779	* perf sets the same sample type to all events as of now
	780	*/
	781	first = perf_evlist__first(session->evlist);
	782	jd.sample_type = first->attr.sample_type;
	783
	784	*nbytes = 0;
	785
	786	ret = jit_inject(&jd, filename);
570735b3	787	if (!ret) {
9b07e27f	788	*nbytes = jd.bytes_written;
570735b3 AH	789	ret = 1;
570735b3 AH	790	}
9b07e27f SE	791
	792	return ret;
	793	}