forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
143 lines
3.2 KiB
143 lines
3.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* |
|
* Copyright (C) 2015 Naveen N. Rao, IBM Corporation |
|
*/ |
|
|
|
#include "dso.h" |
|
#include "symbol.h" |
|
#include "map.h" |
|
#include "probe-event.h" |
|
#include "probe-file.h" |
|
|
|
int arch__choose_best_symbol(struct symbol *syma, |
|
struct symbol *symb __maybe_unused) |
|
{ |
|
char *sym = syma->name; |
|
|
|
#if !defined(_CALL_ELF) || _CALL_ELF != 2 |
|
/* Skip over any initial dot */ |
|
if (*sym == '.') |
|
sym++; |
|
#endif |
|
|
|
/* 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; |
|
} |
|
|
|
#if !defined(_CALL_ELF) || _CALL_ELF != 2 |
|
/* 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); |
|
} |
|
|
|
int arch__compare_symbol_names_n(const char *namea, const char *nameb, |
|
unsigned int n) |
|
{ |
|
/* Skip over initial dot */ |
|
if (*namea == '.') |
|
namea++; |
|
if (*nameb == '.') |
|
nameb++; |
|
|
|
return strncmp(namea, nameb, n); |
|
} |
|
|
|
const char *arch__normalize_symbol_name(const char *name) |
|
{ |
|
/* Skip over initial dot */ |
|
if (name && *name == '.') |
|
name++; |
|
return name; |
|
} |
|
#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. |
|
*/ |
|
if (pev->point.offset || !map || !sym) |
|
return; |
|
|
|
/* For kretprobes, add an offset only if the kernel supports it */ |
|
if (!pev->uprobes && pev->point.retprobe) { |
|
#ifdef HAVE_LIBELF_SUPPORT |
|
if (!kretprobe_offset_is_supported()) |
|
#endif |
|
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->nsi, pev->uprobes); |
|
if (!map || map__load(map) < 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); |
|
break; |
|
} |
|
} |
|
} |
|
} |
|
#endif /* HAVE_LIBELF_SUPPORT */ |
|
|
|
#endif
|
|
|