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"
11#include "map.h"
12#include "probe-event.h"
13
14#ifdef HAVE_LIBELF_SUPPORT
15bool 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}
21
22#if defined(_CALL_ELF) && _CALL_ELF == 2
23void arch__elf_sym_adjust(GElf_Sym *sym)
24{
25	sym->st_value += PPC64_LOCAL_ENTRY_OFFSET(sym->st_other);
26}
27#endif
28#endif
29
30#if !defined(_CALL_ELF) || _CALL_ELF != 2
31int arch__choose_best_symbol(struct symbol *syma,
32			     struct symbol *symb __maybe_unused)
33{
34	char *sym = syma->name;
35
36	/* Skip over any initial dot */
37	if (*sym == '.')
38		sym++;
39
40	/* Avoid "SyS" kernel syscall aliases */
41	if (strlen(sym) >= 3 && !strncmp(sym, "SyS", 3))
42		return SYMBOL_B;
43	if (strlen(sym) >= 10 && !strncmp(sym, "compat_SyS", 10))
44		return SYMBOL_B;
45
46	return SYMBOL_A;
47}
48
49/* Allow matching against dot variants */
50int arch__compare_symbol_names(const char *namea, const char *nameb)
51{
52	/* Skip over initial dot */
53	if (*namea == '.')
54		namea++;
55	if (*nameb == '.')
56		nameb++;
57
58	return strcmp(namea, nameb);
59}
60#endif
61
62#if defined(_CALL_ELF) && _CALL_ELF == 2
63bool arch__prefers_symtab(void)
64{
65	return true;
66}
67
68#define PPC64LE_LEP_OFFSET	8
69
70void arch__fix_tev_from_maps(struct perf_probe_event *pev,
71			     struct probe_trace_event *tev, struct map *map)
72{
73	/*
74	 * ppc64 ABIv2 local entry point is currently always 2 instructions
75	 * (8 bytes) after the global entry point.
76	 */
77	if (!pev->uprobes && map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS) {
78		tev->point.address += PPC64LE_LEP_OFFSET;
79		tev->point.offset += PPC64LE_LEP_OFFSET;
80	}
81}
82#endif
83