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d2332098 NR |
1 | /* |
2 | * This program is free software; you can redistribute it and/or modify | |
3 | * it under the terms of the GNU General Public License, version 2, as | |
4 | * published by the Free Software Foundation. | |
5 | * | |
6 | * Copyright (C) 2015 Naveen N. Rao, IBM Corporation | |
7 | */ | |
8 | ||
9 | #include "debug.h" | |
10 | #include "symbol.h" | |
031b84c4 | 11 | #include "map.h" |
d5c2e2c1 | 12 | #include "probe-event.h" |
d2332098 NR |
13 | |
14 | #ifdef HAVE_LIBELF_SUPPORT | |
15 | bool elf__needs_adjust_symbols(GElf_Ehdr ehdr) | |
16 | { | |
17 | return ehdr.e_type == ET_EXEC || | |
18 | ehdr.e_type == ET_REL || | |
19 | ehdr.e_type == ET_DYN; | |
20 | } | |
c50fc0a4 | 21 | |
d2332098 | 22 | #endif |
fb6d5942 NR |
23 | |
24 | #if !defined(_CALL_ELF) || _CALL_ELF != 2 | |
25 | int arch__choose_best_symbol(struct symbol *syma, | |
26 | struct symbol *symb __maybe_unused) | |
27 | { | |
28 | char *sym = syma->name; | |
29 | ||
30 | /* Skip over any initial dot */ | |
31 | if (*sym == '.') | |
32 | sym++; | |
33 | ||
34 | /* Avoid "SyS" kernel syscall aliases */ | |
35 | if (strlen(sym) >= 3 && !strncmp(sym, "SyS", 3)) | |
36 | return SYMBOL_B; | |
37 | if (strlen(sym) >= 10 && !strncmp(sym, "compat_SyS", 10)) | |
38 | return SYMBOL_B; | |
39 | ||
40 | return SYMBOL_A; | |
41 | } | |
031b84c4 NR |
42 | |
43 | /* Allow matching against dot variants */ | |
44 | int arch__compare_symbol_names(const char *namea, const char *nameb) | |
45 | { | |
46 | /* Skip over initial dot */ | |
47 | if (*namea == '.') | |
48 | namea++; | |
49 | if (*nameb == '.') | |
50 | nameb++; | |
51 | ||
52 | return strcmp(namea, nameb); | |
53 | } | |
fb6d5942 | 54 | #endif |
d5c2e2c1 NR |
55 | |
56 | #if defined(_CALL_ELF) && _CALL_ELF == 2 | |
7b6ff0bd | 57 | |
0b3c2264 NR |
58 | #ifdef HAVE_LIBELF_SUPPORT |
59 | void arch__sym_update(struct symbol *s, GElf_Sym *sym) | |
60 | { | |
61 | s->arch_sym = sym->st_other; | |
62 | } | |
63 | #endif | |
64 | ||
7b6ff0bd NR |
65 | #define PPC64LE_LEP_OFFSET 8 |
66 | ||
67 | void arch__fix_tev_from_maps(struct perf_probe_event *pev, | |
0b3c2264 NR |
68 | struct probe_trace_event *tev, struct map *map, |
69 | struct symbol *sym) | |
7b6ff0bd | 70 | { |
0b3c2264 NR |
71 | int lep_offset; |
72 | ||
7b6ff0bd | 73 | /* |
239aeba7 NR |
74 | * When probing at a function entry point, we normally always want the |
75 | * LEP since that catches calls to the function through both the GEP and | |
76 | * the LEP. Hence, we would like to probe at an offset of 8 bytes if | |
77 | * the user only specified the function entry. | |
78 | * | |
79 | * However, if the user specifies an offset, we fall back to using the | |
80 | * GEP since all userspace applications (objdump/readelf) show function | |
81 | * disassembly with offsets from the GEP. | |
82 | * | |
83 | * In addition, we shouldn't specify an offset for kretprobes. | |
7b6ff0bd | 84 | */ |
0b3c2264 | 85 | if (pev->point.offset || pev->point.retprobe || !map || !sym) |
239aeba7 NR |
86 | return; |
87 | ||
0b3c2264 NR |
88 | lep_offset = PPC64_LOCAL_ENTRY_OFFSET(sym->arch_sym); |
89 | ||
239aeba7 | 90 | if (map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS) |
7b6ff0bd | 91 | tev->point.offset += PPC64LE_LEP_OFFSET; |
0b3c2264 NR |
92 | else if (lep_offset) { |
93 | if (pev->uprobes) | |
94 | tev->point.address += lep_offset; | |
95 | else | |
96 | tev->point.offset += lep_offset; | |
97 | } | |
7b6ff0bd | 98 | } |
99e608b5 RB |
99 | |
100 | void arch__post_process_probe_trace_events(struct perf_probe_event *pev, | |
101 | int ntevs) | |
102 | { | |
103 | struct probe_trace_event *tev; | |
104 | struct map *map; | |
105 | struct symbol *sym = NULL; | |
106 | struct rb_node *tmp; | |
107 | int i = 0; | |
108 | ||
109 | map = get_target_map(pev->target, pev->uprobes); | |
110 | if (!map || map__load(map, NULL) < 0) | |
111 | return; | |
112 | ||
113 | for (i = 0; i < ntevs; i++) { | |
114 | tev = &pev->tevs[i]; | |
115 | map__for_each_symbol(map, sym, tmp) { | |
116 | if (map->unmap_ip(map, sym->start) == tev->point.address) | |
117 | arch__fix_tev_from_maps(pev, tev, map, sym); | |
118 | } | |
119 | } | |
120 | } | |
121 | ||
d5c2e2c1 | 122 | #endif |