tools/perf/arch/powerpc/util/sym-handling.c

   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
  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 }
  21
  22 #if defined(_CALL_ELF) && _CALL_ELF == 2
  23 void 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
  31 int 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 */
  50 int 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
  63 bool arch__prefers_symtab(void)
  64 {
  65         return true;
  66 }
  67
  68 #define PPC64LE_LEP_OFFSET      8
  69
  70 void 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