f046f3df66
arch__post_process_probe_trace_events() calls get_target_map() to prepare symbol table. get_target_map() is defined inside util/probe-event.c. probe-event.c will only get included in perf binary if CONFIG_LIBELF is set. Hence arch__post_process_probe_trace_events() needs to be defined inside #ifdef HAVE_LIBELF_SUPPORT to solve compilation error. Reported-and-Tested-by: Anton Blanchard <anton@samba.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Balbir Singh <bsingharora@gmail.com> Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Cc: Namhyung Kim <namhyung@kernel.org> Link: http://lkml.kernel.org/r/57ABFF88.8030905@linux.vnet.ibm.com [ Thunderbird MUA mangled it, fix that ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
125 lines
3.0 KiB
C
125 lines
3.0 KiB
C
/*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License, version 2, as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* Copyright (C) 2015 Naveen N. Rao, IBM Corporation
|
|
*/
|
|
|
|
#include "debug.h"
|
|
#include "symbol.h"
|
|
#include "map.h"
|
|
#include "probe-event.h"
|
|
|
|
#ifdef HAVE_LIBELF_SUPPORT
|
|
bool elf__needs_adjust_symbols(GElf_Ehdr ehdr)
|
|
{
|
|
return ehdr.e_type == ET_EXEC ||
|
|
ehdr.e_type == ET_REL ||
|
|
ehdr.e_type == ET_DYN;
|
|
}
|
|
|
|
#endif
|
|
|
|
#if !defined(_CALL_ELF) || _CALL_ELF != 2
|
|
int arch__choose_best_symbol(struct symbol *syma,
|
|
struct symbol *symb __maybe_unused)
|
|
{
|
|
char *sym = syma->name;
|
|
|
|
/* Skip over any initial dot */
|
|
if (*sym == '.')
|
|
sym++;
|
|
|
|
/* Avoid "SyS" kernel syscall aliases */
|
|
if (strlen(sym) >= 3 && !strncmp(sym, "SyS", 3))
|
|
return SYMBOL_B;
|
|
if (strlen(sym) >= 10 && !strncmp(sym, "compat_SyS", 10))
|
|
return SYMBOL_B;
|
|
|
|
return SYMBOL_A;
|
|
}
|
|
|
|
/* Allow matching against dot variants */
|
|
int arch__compare_symbol_names(const char *namea, const char *nameb)
|
|
{
|
|
/* Skip over initial dot */
|
|
if (*namea == '.')
|
|
namea++;
|
|
if (*nameb == '.')
|
|
nameb++;
|
|
|
|
return strcmp(namea, nameb);
|
|
}
|
|
#endif
|
|
|
|
#if defined(_CALL_ELF) && _CALL_ELF == 2
|
|
|
|
#ifdef HAVE_LIBELF_SUPPORT
|
|
void arch__sym_update(struct symbol *s, GElf_Sym *sym)
|
|
{
|
|
s->arch_sym = sym->st_other;
|
|
}
|
|
#endif
|
|
|
|
#define PPC64LE_LEP_OFFSET 8
|
|
|
|
void arch__fix_tev_from_maps(struct perf_probe_event *pev,
|
|
struct probe_trace_event *tev, struct map *map,
|
|
struct symbol *sym)
|
|
{
|
|
int lep_offset;
|
|
|
|
/*
|
|
* When probing at a function entry point, we normally always want the
|
|
* LEP since that catches calls to the function through both the GEP and
|
|
* the LEP. Hence, we would like to probe at an offset of 8 bytes if
|
|
* the user only specified the function entry.
|
|
*
|
|
* However, if the user specifies an offset, we fall back to using the
|
|
* GEP since all userspace applications (objdump/readelf) show function
|
|
* disassembly with offsets from the GEP.
|
|
*
|
|
* In addition, we shouldn't specify an offset for kretprobes.
|
|
*/
|
|
if (pev->point.offset || pev->point.retprobe || !map || !sym)
|
|
return;
|
|
|
|
lep_offset = PPC64_LOCAL_ENTRY_OFFSET(sym->arch_sym);
|
|
|
|
if (map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS)
|
|
tev->point.offset += PPC64LE_LEP_OFFSET;
|
|
else if (lep_offset) {
|
|
if (pev->uprobes)
|
|
tev->point.address += lep_offset;
|
|
else
|
|
tev->point.offset += lep_offset;
|
|
}
|
|
}
|
|
|
|
#ifdef HAVE_LIBELF_SUPPORT
|
|
void arch__post_process_probe_trace_events(struct perf_probe_event *pev,
|
|
int ntevs)
|
|
{
|
|
struct probe_trace_event *tev;
|
|
struct map *map;
|
|
struct symbol *sym = NULL;
|
|
struct rb_node *tmp;
|
|
int i = 0;
|
|
|
|
map = get_target_map(pev->target, pev->uprobes);
|
|
if (!map || map__load(map, NULL) < 0)
|
|
return;
|
|
|
|
for (i = 0; i < ntevs; i++) {
|
|
tev = &pev->tevs[i];
|
|
map__for_each_symbol(map, sym, tmp) {
|
|
if (map->unmap_ip(map, sym->start) == tev->point.address)
|
|
arch__fix_tev_from_maps(pev, tev, map, sym);
|
|
}
|
|
}
|
|
}
|
|
#endif /* HAVE_LIBELF_SUPPORT */
|
|
|
|
#endif
|