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7b6ff0bdbf
On powerpc ABIv2, if no debug-info is found and we use kallsyms, we need to fixup the function entry to point to the local entry point. Use offset of 8 since current toolchains always generate 2 instructions (8 bytes). Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Reviewed-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Cc: linuxppc-dev@lists.ozlabs.org Link: http://lkml.kernel.org/r/92253021e77a104b23b615c8c23bf9501dfe60bf.1430217967.git.naveen.n.rao@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
83 lines
1.8 KiB
C
83 lines
1.8 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* Copyright (C) 2015 Naveen N. Rao, IBM Corporation
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*/
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#include "debug.h"
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#include "symbol.h"
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#include "map.h"
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#include "probe-event.h"
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#ifdef HAVE_LIBELF_SUPPORT
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bool elf__needs_adjust_symbols(GElf_Ehdr ehdr)
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{
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return ehdr.e_type == ET_EXEC ||
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ehdr.e_type == ET_REL ||
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ehdr.e_type == ET_DYN;
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}
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#if defined(_CALL_ELF) && _CALL_ELF == 2
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void arch__elf_sym_adjust(GElf_Sym *sym)
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{
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sym->st_value += PPC64_LOCAL_ENTRY_OFFSET(sym->st_other);
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}
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#endif
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#endif
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#if !defined(_CALL_ELF) || _CALL_ELF != 2
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int arch__choose_best_symbol(struct symbol *syma,
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struct symbol *symb __maybe_unused)
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{
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char *sym = syma->name;
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/* Skip over any initial dot */
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if (*sym == '.')
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sym++;
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/* Avoid "SyS" kernel syscall aliases */
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if (strlen(sym) >= 3 && !strncmp(sym, "SyS", 3))
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return SYMBOL_B;
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if (strlen(sym) >= 10 && !strncmp(sym, "compat_SyS", 10))
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return SYMBOL_B;
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return SYMBOL_A;
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}
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/* Allow matching against dot variants */
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int arch__compare_symbol_names(const char *namea, const char *nameb)
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{
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/* Skip over initial dot */
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if (*namea == '.')
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namea++;
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if (*nameb == '.')
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nameb++;
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return strcmp(namea, nameb);
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}
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#endif
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#if defined(_CALL_ELF) && _CALL_ELF == 2
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bool arch__prefers_symtab(void)
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{
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return true;
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}
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#define PPC64LE_LEP_OFFSET 8
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void arch__fix_tev_from_maps(struct perf_probe_event *pev,
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struct probe_trace_event *tev, struct map *map)
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{
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/*
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* ppc64 ABIv2 local entry point is currently always 2 instructions
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* (8 bytes) after the global entry point.
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*/
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if (!pev->uprobes && map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS) {
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tev->point.address += PPC64LE_LEP_OFFSET;
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tev->point.offset += PPC64LE_LEP_OFFSET;
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}
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}
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#endif
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