xref: /kernel/linux/linux-5.10/tools/perf/util/jitdump.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * 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 ALIGN_8(x) (((x) + 7) & (~7))

#define JITHEADER_VERSION 1

enum jitdump_flags_bits {
	JITDUMP_FLAGS_ARCH_TIMESTAMP_BIT,
	JITDUMP_FLAGS_MAX_BIT,
};

#define JITDUMP_FLAGS_ARCH_TIMESTAMP	(1ULL << JITDUMP_FLAGS_ARCH_TIMESTAMP_BIT)

#define JITDUMP_FLAGS_RESERVED (JITDUMP_FLAGS_MAX_BIT < 64 ? \
				(~((1ULL << JITDUMP_FLAGS_MAX_BIT) - 1)) : 0)

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 */
	uint64_t flags;		/* flags */
};

enum jit_record_type {
	JIT_CODE_LOAD		= 0,
        JIT_CODE_MOVE           = 1,
	JIT_CODE_DEBUG_INFO	= 2,
	JIT_CODE_CLOSE		= 3,
	JIT_CODE_UNWINDING_INFO	= 4,

	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 debug_entry {
	uint64_t addr;
	int lineno;	    /* source line number starting at 1 */
	int discrim;	    /* column discriminator, 0 is default */
	const char name[]; /* null terminated filename, \xff\0 if same as previous entry */
};

struct jr_code_debug_info {
	struct jr_prefix p;

	uint64_t code_addr;
	uint64_t nr_entry;
	struct debug_entry entries[];
};

struct jr_code_unwinding_info {
	struct jr_prefix p;

	uint64_t unwinding_size;
	uint64_t eh_frame_hdr_size;
	uint64_t mapped_size;
	const char unwinding_data[];
};

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;
        struct jr_code_unwinding_info unwinding;
};

static inline struct debug_entry *
debug_entry_next(struct debug_entry *ent)
{
	void *a = ent + 1;
	size_t l = strlen(ent->name) + 1;
	return a + l;
}

static inline char *
debug_entry_file(struct debug_entry *ent)
{
	void *a = ent + 1;
	return a;
}

#endif /* !JITDUMP_H */