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.
6 * Copyright (C) 2015 Naveen N. Rao, IBM Corporation
12 #include "probe-event.h"
14 #ifdef HAVE_LIBELF_SUPPORT
15 bool elf__needs_adjust_symbols(GElf_Ehdr ehdr)
17 return ehdr.e_type == ET_EXEC ||
18 ehdr.e_type == ET_REL ||
19 ehdr.e_type == ET_DYN;
24 #if !defined(_CALL_ELF) || _CALL_ELF != 2
25 int arch__choose_best_symbol(struct symbol *syma,
26 struct symbol *symb __maybe_unused)
28 char *sym = syma->name;
30 /* Skip over any initial dot */
34 /* Avoid "SyS" kernel syscall aliases */
35 if (strlen(sym) >= 3 && !strncmp(sym, "SyS", 3))
37 if (strlen(sym) >= 10 && !strncmp(sym, "compat_SyS", 10))
43 /* Allow matching against dot variants */
44 int arch__compare_symbol_names(const char *namea, const char *nameb)
46 /* Skip over initial dot */
52 return strcmp(namea, nameb);
56 #if defined(_CALL_ELF) && _CALL_ELF == 2
57 bool arch__prefers_symtab(void)
62 #ifdef HAVE_LIBELF_SUPPORT
63 void arch__sym_update(struct symbol *s, GElf_Sym *sym)
65 s->arch_sym = sym->st_other;
69 #define PPC64LE_LEP_OFFSET 8
71 void arch__fix_tev_from_maps(struct perf_probe_event *pev,
72 struct probe_trace_event *tev, struct map *map,
78 * When probing at a function entry point, we normally always want the
79 * LEP since that catches calls to the function through both the GEP and
80 * the LEP. Hence, we would like to probe at an offset of 8 bytes if
81 * the user only specified the function entry.
83 * However, if the user specifies an offset, we fall back to using the
84 * GEP since all userspace applications (objdump/readelf) show function
85 * disassembly with offsets from the GEP.
87 * In addition, we shouldn't specify an offset for kretprobes.
89 if (pev->point.offset || pev->point.retprobe || !map || !sym)
92 lep_offset = PPC64_LOCAL_ENTRY_OFFSET(sym->arch_sym);
94 if (map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS)
95 tev->point.offset += PPC64LE_LEP_OFFSET;
96 else if (lep_offset) {
98 tev->point.address += lep_offset;
100 tev->point.offset += lep_offset;