[tip:perf/core] perf annotate: Start supporting cross arch annotation

From: tip-bot for Arnaldo Carvalho de Melo
Date: Wed Nov 23 2016 - 23:15:30 EST

Commit-ID: 786c1b51844d858041166057c0c79e93c2015013
Gitweb: http://git.kernel.org/tip/786c1b51844d858041166057c0c79e93c2015013
Author: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate: Wed, 16 Nov 2016 15:39:50 -0300
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Thu, 17 Nov 2016 17:12:50 -0300

perf annotate: Start supporting cross arch annotation

Introduce a 'struct arch', where arch specific stuff will live, starting
with objdump's choice of comment delimitation character, that is '#' in
x86 while a ';' in arm.

This has some bits and pieces from a patch submitted by Ravi.

Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Chris Riyder <chris.ryder@xxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Kim Phillips <kim.phillips@xxxxxxx>
Cc: Markus Trippelsdorf <markus@xxxxxxxxxxxxxxx>
Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Naveen N. Rao <naveen.n.rao@xxxxxxxxxxxxxxxxxx>
Cc: Pawel Moll <pawel.moll@xxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Ravi Bangoria <ravi.bangoria@xxxxxxxxxxxxxxxxxx>
Cc: Taeung Song <treeze.taeung@xxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-f337tzjjcl8vtapgvjxmhrbx@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/builtin-top.c | 2 +-
tools/perf/ui/browsers/annotate.c | 2 +-
tools/perf/ui/gtk/annotate.c | 2 +-
tools/perf/util/annotate.c | 114 ++++++++++++++++++++++++++++++++------
tools/perf/util/annotate.h | 6 +-
5 files changed, 103 insertions(+), 23 deletions(-)

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index fe3af95..3df4178 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -130,7 +130,7 @@ static int perf_top__parse_source(struct perf_top *top, struct hist_entry *he)
return err;
}

- err = symbol__disassemble(sym, map, 0);
+ err = symbol__disassemble(sym, map, NULL, 0);
if (err == 0) {
out_assign:
top->sym_filter_entry = he;
diff --git a/tools/perf/ui/browsers/annotate.c b/tools/perf/ui/browsers/annotate.c
index 4c18271..e6e9f7d 100644
--- a/tools/perf/ui/browsers/annotate.c
+++ b/tools/perf/ui/browsers/annotate.c
@@ -1050,7 +1050,7 @@ int symbol__tui_annotate(struct symbol *sym, struct map *map,
(nr_pcnt - 1);
}

- err = symbol__disassemble(sym, map, sizeof_bdl);
+ err = symbol__disassemble(sym, map, perf_evsel__env_arch(evsel), sizeof_bdl);
if (err) {
char msg[BUFSIZ];
symbol__strerror_disassemble(sym, map, err, msg, sizeof(msg));
diff --git a/tools/perf/ui/gtk/annotate.c b/tools/perf/ui/gtk/annotate.c
index 42d3199..8c9308a 100644
--- a/tools/perf/ui/gtk/annotate.c
+++ b/tools/perf/ui/gtk/annotate.c
@@ -167,7 +167,7 @@ static int symbol__gtk_annotate(struct symbol *sym, struct map *map,
if (map->dso->annotate_warned)
return -1;

- err = symbol__disassemble(sym, map, 0);
+ err = symbol__disassemble(sym, map, perf_evsel__env_arch(evsel), 0);
if (err) {
char msg[BUFSIZ];
symbol__strerror_disassemble(sym, map, err, msg, sizeof(msg));
diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index aeb5a44..1ba41a2 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -18,9 +18,11 @@
#include "annotate.h"
#include "evsel.h"
#include "block-range.h"
+#include "arch/common.h"
#include <regex.h>
#include <pthread.h>
#include <linux/bitops.h>
+#include <sys/utsname.h>

const char *disassembler_style;
const char *objdump_path;
@@ -29,6 +31,28 @@ static regex_t file_lineno;
static struct ins *ins__find(const char *name);
static int disasm_line__parse(char *line, char **namep, char **rawp);

+struct arch {
+ const char *name;
+ struct {
+ char comment_char;
+ } objdump;
+};
+
+static struct arch architectures[] = {
+ {
+ .name = "arm",
+ .objdump = {
+ .comment_char = ';',
+ },
+ },
+ {
+ .name = "x86",
+ .objdump = {
+ .comment_char = '#',
+ },
+ },
+};
+
static void ins__delete(struct ins_operands *ops)
{
if (ops == NULL)
@@ -54,7 +78,7 @@ int ins__scnprintf(struct ins *ins, char *bf, size_t size,
return ins__raw_scnprintf(ins, bf, size, ops);
}

-static int call__parse(struct ins_operands *ops, struct map *map)
+static int call__parse(struct arch *arch __maybe_unused, struct ins_operands *ops, struct map *map)
{
char *endptr, *tok, *name;

@@ -118,7 +142,7 @@ bool ins__is_call(const struct ins *ins)
return ins->ops == &call_ops;
}

-static int jump__parse(struct ins_operands *ops, struct map *map __maybe_unused)
+static int jump__parse(struct arch *arch __maybe_unused, struct ins_operands *ops, struct map *map __maybe_unused)
{
const char *s = strchr(ops->raw, '+');

@@ -173,7 +197,7 @@ static int comment__symbol(char *raw, char *comment, u64 *addrp, char **namep)
return 0;
}

-static int lock__parse(struct ins_operands *ops, struct map *map)
+static int lock__parse(struct arch *arch, struct ins_operands *ops, struct map *map)
{
char *name;

@@ -194,7 +218,7 @@ static int lock__parse(struct ins_operands *ops, struct map *map)
return 0;

if (ops->locked.ins->ops->parse &&
- ops->locked.ins->ops->parse(ops->locked.ops, map) < 0)
+ ops->locked.ins->ops->parse(arch, ops->locked.ops, map) < 0)
goto out_free_ops;

return 0;
@@ -237,7 +261,7 @@ static struct ins_ops lock_ops = {
.scnprintf = lock__scnprintf,
};

-static int mov__parse(struct ins_operands *ops, struct map *map __maybe_unused)
+static int mov__parse(struct arch *arch, struct ins_operands *ops, struct map *map __maybe_unused)
{
char *s = strchr(ops->raw, ','), *target, *comment, prev;

@@ -252,11 +276,7 @@ static int mov__parse(struct ins_operands *ops, struct map *map __maybe_unused)
return -1;

target = ++s;
-#ifdef __arm__
- comment = strchr(s, ';');
-#else
- comment = strchr(s, '#');
-#endif
+ comment = strchr(s, arch->objdump.comment_char);

if (comment != NULL)
s = comment - 1;
@@ -304,7 +324,7 @@ static struct ins_ops mov_ops = {
.scnprintf = mov__scnprintf,
};

-static int dec__parse(struct ins_operands *ops, struct map *map __maybe_unused)
+static int dec__parse(struct arch *arch __maybe_unused, struct ins_operands *ops, struct map *map __maybe_unused)
{
char *target, *comment, *s, prev;

@@ -492,6 +512,41 @@ static struct ins *ins__find(const char *name)
return bsearch(name, instructions, nmemb, sizeof(struct ins), ins__key_cmp);
}

+static int arch__key_cmp(const void *name, const void *archp)
+{
+ const struct arch *arch = archp;
+
+ return strcmp(name, arch->name);
+}
+
+static int arch__cmp(const void *a, const void *b)
+{
+ const struct arch *aa = a;
+ const struct arch *ab = b;
+
+ return strcmp(aa->name, ab->name);
+}
+
+static void arch__sort(void)
+{
+ const int nmemb = ARRAY_SIZE(architectures);
+
+ qsort(architectures, nmemb, sizeof(struct arch), arch__cmp);
+}
+
+static struct arch *arch__find(const char *name)
+{
+ const int nmemb = ARRAY_SIZE(architectures);
+ static bool sorted;
+
+ if (!sorted) {
+ arch__sort();
+ sorted = true;
+ }
+
+ return bsearch(name, architectures, nmemb, sizeof(struct arch), arch__key_cmp);
+}
+
int symbol__alloc_hist(struct symbol *sym)
{
struct annotation *notes = symbol__annotation(sym);
@@ -709,7 +764,7 @@ int hist_entry__inc_addr_samples(struct hist_entry *he, int evidx, u64 ip)
return symbol__inc_addr_samples(he->ms.sym, he->ms.map, evidx, ip);
}

-static void disasm_line__init_ins(struct disasm_line *dl, struct map *map)
+static void disasm_line__init_ins(struct disasm_line *dl, struct arch *arch, struct map *map)
{
dl->ins = ins__find(dl->name);

@@ -719,7 +774,7 @@ static void disasm_line__init_ins(struct disasm_line *dl, struct map *map)
if (!dl->ins->ops)
return;

- if (dl->ins->ops->parse && dl->ins->ops->parse(&dl->ops, map) < 0)
+ if (dl->ins->ops->parse && dl->ins->ops->parse(arch, &dl->ops, map) < 0)
dl->ins = NULL;
}

@@ -762,6 +817,7 @@ out_free_name:

static struct disasm_line *disasm_line__new(s64 offset, char *line,
size_t privsize, int line_nr,
+ struct arch *arch,
struct map *map)
{
struct disasm_line *dl = zalloc(sizeof(*dl) + privsize);
@@ -777,7 +833,7 @@ static struct disasm_line *disasm_line__new(s64 offset, char *line,
if (disasm_line__parse(dl->line, &dl->name, &dl->ops.raw) < 0)
goto out_free_line;

- disasm_line__init_ins(dl, map);
+ disasm_line__init_ins(dl, arch, map);
}
}

@@ -1087,6 +1143,7 @@ static int disasm_line__print(struct disasm_line *dl, struct symbol *sym, u64 st
* The ops.raw part will be parsed further according to type of the instruction.
*/
static int symbol__parse_objdump_line(struct symbol *sym, struct map *map,
+ struct arch *arch,
FILE *file, size_t privsize,
int *line_nr)
{
@@ -1149,7 +1206,7 @@ static int symbol__parse_objdump_line(struct symbol *sym, struct map *map,
parsed_line = tmp2 + 1;
}

- dl = disasm_line__new(offset, parsed_line, privsize, *line_nr, map);
+ dl = disasm_line__new(offset, parsed_line, privsize, *line_nr, arch, map);
free(line);
(*line_nr)++;

@@ -1280,10 +1337,23 @@ fallback:
return 0;
}

-int symbol__disassemble(struct symbol *sym, struct map *map, size_t privsize)
+static const char *annotate__norm_arch(const char *arch_name)
+{
+ struct utsname uts;
+
+ if (!arch_name) { /* Assume we are annotating locally. */
+ if (uname(&uts) < 0)
+ return NULL;
+ arch_name = uts.machine;
+ }
+ return normalize_arch((char *)arch_name);
+}
+
+int symbol__disassemble(struct symbol *sym, struct map *map, const char *arch_name, size_t privsize)
{
struct dso *dso = map->dso;
char command[PATH_MAX * 2];
+ struct arch *arch = NULL;
FILE *file;
char symfs_filename[PATH_MAX];
struct kcore_extract kce;
@@ -1297,6 +1367,14 @@ int symbol__disassemble(struct symbol *sym, struct map *map, size_t privsize)
if (err)
return err;

+ arch_name = annotate__norm_arch(arch_name);
+ if (!arch_name)
+ return -1;
+
+ arch = arch__find(arch_name);
+ if (arch == NULL)
+ return -ENOTSUP;
+
pr_debug("%s: filename=%s, sym=%s, start=%#" PRIx64 ", end=%#" PRIx64 "\n", __func__,
symfs_filename, sym->name, map->unmap_ip(map, sym->start),
map->unmap_ip(map, sym->end));
@@ -1395,7 +1473,7 @@ int symbol__disassemble(struct symbol *sym, struct map *map, size_t privsize)

nline = 0;
while (!feof(file)) {
- if (symbol__parse_objdump_line(sym, map, file, privsize,
+ if (symbol__parse_objdump_line(sym, map, arch, file, privsize,
&lineno) < 0)
break;
nline++;
@@ -1793,7 +1871,7 @@ int symbol__tty_annotate(struct symbol *sym, struct map *map,
struct rb_root source_line = RB_ROOT;
u64 len;

- if (symbol__disassemble(sym, map, 0) < 0)
+ if (symbol__disassemble(sym, map, perf_evsel__env_arch(evsel), 0) < 0)
return -1;

len = symbol__size(sym);
diff --git a/tools/perf/util/annotate.h b/tools/perf/util/annotate.h
index 5bbcec1..8e490b5 100644
--- a/tools/perf/util/annotate.h
+++ b/tools/perf/util/annotate.h
@@ -34,9 +34,11 @@ struct ins_operands {
};
};

+struct arch;
+
struct ins_ops {
void (*free)(struct ins_operands *ops);
- int (*parse)(struct ins_operands *ops, struct map *map);
+ int (*parse)(struct arch *arch, struct ins_operands *ops, struct map *map);
int (*scnprintf)(struct ins *ins, char *bf, size_t size,
struct ins_operands *ops);
};
@@ -156,7 +158,7 @@ int hist_entry__inc_addr_samples(struct hist_entry *he, int evidx, u64 addr);
int symbol__alloc_hist(struct symbol *sym);
void symbol__annotate_zero_histograms(struct symbol *sym);

-int symbol__disassemble(struct symbol *sym, struct map *map, size_t privsize);
+int symbol__disassemble(struct symbol *sym, struct map *map, const char *arch_name, size_t privsize);

enum symbol_disassemble_errno {
SYMBOL_ANNOTATE_ERRNO__SUCCESS = 0,