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 83