1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * jitdump.h: jitted code info encapsulation file format
4  *
5  * Adapted from OProfile GPLv2 support jidump.h:
6  * Copyright 2007 OProfile authors
7  * Jens Wilke
8  * Daniel Hansel
9  * Copyright IBM Corporation 2007
10  */
11 #ifndef JITDUMP_H
12 #define JITDUMP_H
13 
14 #include <sys/time.h>
15 #include <time.h>
16 #include <stdint.h>
17 
18 /* JiTD */
19 #define JITHEADER_MAGIC		0x4A695444
20 #define JITHEADER_MAGIC_SW	0x4454694A
21 
22 #define PADDING_8ALIGNED(x) ((((x) + 7) & 7) ^ 7)
23 #define ALIGN_8(x) (((x) + 7) & (~7))
24 
25 #define JITHEADER_VERSION 1
26 
27 enum jitdump_flags_bits {
28 	JITDUMP_FLAGS_ARCH_TIMESTAMP_BIT,
29 	JITDUMP_FLAGS_MAX_BIT,
30 };
31 
32 #define JITDUMP_FLAGS_ARCH_TIMESTAMP	(1ULL << JITDUMP_FLAGS_ARCH_TIMESTAMP_BIT)
33 
34 #define JITDUMP_FLAGS_RESERVED (JITDUMP_FLAGS_MAX_BIT < 64 ? \
35 				(~((1ULL << JITDUMP_FLAGS_MAX_BIT) - 1)) : 0)
36 
37 struct jitheader {
38 	uint32_t magic;		/* characters "jItD" */
39 	uint32_t version;	/* header version */
40 	uint32_t total_size;	/* total size of header */
41 	uint32_t elf_mach;	/* elf mach target */
42 	uint32_t pad1;		/* reserved */
43 	uint32_t pid;		/* JIT process id */
44 	uint64_t timestamp;	/* timestamp */
45 	uint64_t flags;		/* flags */
46 };
47 
48 enum jit_record_type {
49 	JIT_CODE_LOAD		= 0,
50         JIT_CODE_MOVE           = 1,
51 	JIT_CODE_DEBUG_INFO	= 2,
52 	JIT_CODE_CLOSE		= 3,
53 	JIT_CODE_UNWINDING_INFO	= 4,
54 
55 	JIT_CODE_MAX,
56 };
57 
58 /* record prefix (mandatory in each record) */
59 struct jr_prefix {
60 	uint32_t id;
61 	uint32_t total_size;
62 	uint64_t timestamp;
63 };
64 
65 struct jr_code_load {
66 	struct jr_prefix p;
67 
68 	uint32_t pid;
69 	uint32_t tid;
70 	uint64_t vma;
71 	uint64_t code_addr;
72 	uint64_t code_size;
73 	uint64_t code_index;
74 };
75 
76 struct jr_code_close {
77 	struct jr_prefix p;
78 };
79 
80 struct jr_code_move {
81 	struct jr_prefix p;
82 
83 	uint32_t pid;
84 	uint32_t tid;
85 	uint64_t vma;
86 	uint64_t old_code_addr;
87 	uint64_t new_code_addr;
88 	uint64_t code_size;
89 	uint64_t code_index;
90 };
91 
92 struct debug_entry {
93 	uint64_t addr;
94 	int lineno;	    /* source line number starting at 1 */
95 	int discrim;	    /* column discriminator, 0 is default */
96 	const char name[]; /* null terminated filename, \xff\0 if same as previous entry */
97 };
98 
99 struct jr_code_debug_info {
100 	struct jr_prefix p;
101 
102 	uint64_t code_addr;
103 	uint64_t nr_entry;
104 	struct debug_entry entries[];
105 };
106 
107 struct jr_code_unwinding_info {
108 	struct jr_prefix p;
109 
110 	uint64_t unwinding_size;
111 	uint64_t eh_frame_hdr_size;
112 	uint64_t mapped_size;
113 	const char unwinding_data[];
114 };
115 
116 union jr_entry {
117         struct jr_code_debug_info info;
118         struct jr_code_close close;
119         struct jr_code_load load;
120         struct jr_code_move move;
121         struct jr_prefix prefix;
122         struct jr_code_unwinding_info unwinding;
123 };
124 
125 static inline struct debug_entry *
debug_entry_next(struct debug_entry * ent)126 debug_entry_next(struct debug_entry *ent)
127 {
128 	void *a = ent + 1;
129 	size_t l = strlen(ent->name) + 1;
130 	return a + l;
131 }
132 
133 static inline char *
debug_entry_file(struct debug_entry * ent)134 debug_entry_file(struct debug_entry *ent)
135 {
136 	void *a = ent + 1;
137 	return a;
138 }
139 
140 #endif /* !JITDUMP_H */
141