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linux/tools/perf/util/annotate.c
Numfor Mbiziwo-Tiapo b39730a663 perf annotate: Fix non-null terminated buffer returned by readlink() 
Our local MSAN (Memory Sanitizer) build of perf throws a warning that
comes from the "dso__disassemble_filename" function in
"tools/perf/util/annotate.c" when running perf record.

The warning stems from the call to readlink, in which "build_id_path"
was being read into "linkname". Since readlink does not null terminate,
an uninitialized memory access would later occur when "linkname" is
passed into the strstr function. This is simply fixed by
null-terminating "linkname" after the call to readlink.

To reproduce this warning, build perf by running:

  $ make -C tools/perf CLANG=1 CC=clang EXTRA_CFLAGS="-fsanitize=memory -fsanitize-memory-track-origins"

(Additionally, llvm might have to be installed and clang might have to
be specified as the compiler - export CC=/usr/bin/clang)

Then running:

  tools/perf/perf record -o - ls / | tools/perf/perf --no-pager annotate -i - --stdio

Please see the cover letter for why false positive warnings may be
generated.

Signed-off-by: Numfor Mbiziwo-Tiapo <nums@google.com>
Acked-by: Ian Rogers <irogers@google.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Mark Drayton <mbd@fb.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20190729205750.193289-1-nums@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2020-07-09 12:36:50 -03:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
*
* Parts came from builtin-annotate.c, see those files for further
* copyright notes.
*/
#include <errno.h>
#include <inttypes.h>
#include <libgen.h>
#include <stdlib.h>
#include <bpf/bpf.h>
#include <bpf/btf.h>
#include <bpf/libbpf.h>
#include <linux/btf.h>
#include "util.h" // hex_width()
#include "ui/ui.h"
#include "sort.h"
#include "build-id.h"
#include "color.h"
#include "config.h"
#include "dso.h"
#include "env.h"
#include "map.h"
#include "maps.h"
#include "symbol.h"
#include "srcline.h"
#include "units.h"
#include "debug.h"
#include "annotate.h"
#include "evsel.h"
#include "evlist.h"
#include "bpf-event.h"
#include "block-range.h"
#include "string2.h"
#include "util/event.h"
#include "arch/common.h"
#include <regex.h>
#include <pthread.h>
#include <linux/bitops.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <subcmd/parse-options.h>
#include <subcmd/run-command.h>
/* FIXME: For the HE_COLORSET */
#include "ui/browser.h"
/*
* FIXME: Using the same values as slang.h,
* but that header may not be available everywhere
*/
#define LARROW_CHAR ((unsigned char)',')
#define RARROW_CHAR ((unsigned char)'+')
#define DARROW_CHAR ((unsigned char)'.')
#define UARROW_CHAR ((unsigned char)'-')
#include <linux/ctype.h>
struct annotation_options annotation__default_options = {
.use_offset = true,
.jump_arrows = true,
.annotate_src = true,
.offset_level = ANNOTATION__OFFSET_JUMP_TARGETS,
.percent_type = PERCENT_PERIOD_LOCAL,
};
static regex_t file_lineno;
static struct ins_ops *ins__find(struct arch *arch, const char *name);
static void ins__sort(struct arch *arch);
static int disasm_line__parse(char *line, const char **namep, char **rawp);
struct arch {
const char *name;
struct ins *instructions;
size_t nr_instructions;
size_t nr_instructions_allocated;
struct ins_ops *(*associate_instruction_ops)(struct arch *arch, const char *name);
bool sorted_instructions;
bool initialized;
void *priv;
unsigned int model;
unsigned int family;
int (*init)(struct arch *arch, char *cpuid);
bool (*ins_is_fused)(struct arch *arch, const char *ins1,
const char *ins2);
struct {
char comment_char;
char skip_functions_char;
} objdump;
};
static struct ins_ops call_ops;
static struct ins_ops dec_ops;
static struct ins_ops jump_ops;
static struct ins_ops mov_ops;
static struct ins_ops nop_ops;
static struct ins_ops lock_ops;
static struct ins_ops ret_ops;
static int arch__grow_instructions(struct arch *arch)
{
struct ins *new_instructions;
size_t new_nr_allocated;
if (arch->nr_instructions_allocated == 0 && arch->instructions)
goto grow_from_non_allocated_table;
new_nr_allocated = arch->nr_instructions_allocated + 128;
new_instructions = realloc(arch->instructions, new_nr_allocated * sizeof(struct ins));
if (new_instructions == NULL)
return -1;
out_update_instructions:
arch->instructions = new_instructions;
arch->nr_instructions_allocated = new_nr_allocated;
return 0;
grow_from_non_allocated_table:
new_nr_allocated = arch->nr_instructions + 128;
new_instructions = calloc(new_nr_allocated, sizeof(struct ins));
if (new_instructions == NULL)
return -1;
memcpy(new_instructions, arch->instructions, arch->nr_instructions);
goto out_update_instructions;
}
static int arch__associate_ins_ops(struct arch* arch, const char *name, struct ins_ops *ops)
{
struct ins *ins;
if (arch->nr_instructions == arch->nr_instructions_allocated &&
arch__grow_instructions(arch))
return -1;
ins = &arch->instructions[arch->nr_instructions];
ins->name = strdup(name);
if (!ins->name)
return -1;
ins->ops = ops;
arch->nr_instructions++;
ins__sort(arch);
return 0;
}
#include "arch/arc/annotate/instructions.c"
#include "arch/arm/annotate/instructions.c"
#include "arch/arm64/annotate/instructions.c"
#include "arch/csky/annotate/instructions.c"
#include "arch/x86/annotate/instructions.c"
#include "arch/powerpc/annotate/instructions.c"
#include "arch/s390/annotate/instructions.c"
#include "arch/sparc/annotate/instructions.c"
static struct arch architectures[] = {
{
.name = "arc",
.init = arc__annotate_init,
},
{
.name = "arm",
.init = arm__annotate_init,
},
{
.name = "arm64",
.init = arm64__annotate_init,
},
{
.name = "csky",
.init = csky__annotate_init,
},
{
.name = "x86",
.init = x86__annotate_init,
.instructions = x86__instructions,
.nr_instructions = ARRAY_SIZE(x86__instructions),
.ins_is_fused = x86__ins_is_fused,
.objdump = {
.comment_char = '#',
},
},
{
.name = "powerpc",
.init = powerpc__annotate_init,
},
{
.name = "s390",
.init = s390__annotate_init,
.objdump = {
.comment_char = '#',
},
},
{
.name = "sparc",
.init = sparc__annotate_init,
.objdump = {
.comment_char = '#',
},
},
};
static void ins__delete(struct ins_operands *ops)
{
if (ops == NULL)
return;
zfree(&ops->source.raw);
zfree(&ops->source.name);
zfree(&ops->target.raw);
zfree(&ops->target.name);
}
static int ins__raw_scnprintf(struct ins *ins, char *bf, size_t size,
struct ins_operands *ops, int max_ins_name)
{
return scnprintf(bf, size, "%-*s %s", max_ins_name, ins->name, ops->raw);
}
int ins__scnprintf(struct ins *ins, char *bf, size_t size,
struct ins_operands *ops, int max_ins_name)
{
if (ins->ops->scnprintf)
return ins->ops->scnprintf(ins, bf, size, ops, max_ins_name);
return ins__raw_scnprintf(ins, bf, size, ops, max_ins_name);
}
bool ins__is_fused(struct arch *arch, const char *ins1, const char *ins2)
{
if (!arch || !arch->ins_is_fused)
return false;
return arch->ins_is_fused(arch, ins1, ins2);
}
static int call__parse(struct arch *arch, struct ins_operands *ops, struct map_symbol *ms)
{
char *endptr, *tok, *name;
struct map *map = ms->map;
struct addr_map_symbol target = {
.ms = { .map = map, },
};
ops->target.addr = strtoull(ops->raw, &endptr, 16);
name = strchr(endptr, '<');
if (name == NULL)
goto indirect_call;
name++;
if (arch->objdump.skip_functions_char &&
strchr(name, arch->objdump.skip_functions_char))
return -1;
tok = strchr(name, '>');
if (tok == NULL)
return -1;
*tok = '\0';
ops->target.name = strdup(name);
*tok = '>';
if (ops->target.name == NULL)
return -1;
find_target:
target.addr = map__objdump_2mem(map, ops->target.addr);
if (maps__find_ams(ms->maps, &target) == 0 &&
map__rip_2objdump(target.ms.map, map->map_ip(target.ms.map, target.addr)) == ops->target.addr)
ops->target.sym = target.ms.sym;
return 0;
indirect_call:
tok = strchr(endptr, '*');
if (tok != NULL) {
endptr++;
/* Indirect call can use a non-rip register and offset: callq *0x8(%rbx).
* Do not parse such instruction. */
if (strstr(endptr, "(%r") == NULL)
ops->target.addr = strtoull(endptr, NULL, 16);
}
goto find_target;
}
static int call__scnprintf(struct ins *ins, char *bf, size_t size,
struct ins_operands *ops, int max_ins_name)
{
if (ops->target.sym)
return scnprintf(bf, size, "%-*s %s", max_ins_name, ins->name, ops->target.sym->name);
if (ops->target.addr == 0)
return ins__raw_scnprintf(ins, bf, size, ops, max_ins_name);
if (ops->target.name)
return scnprintf(bf, size, "%-*s %s", max_ins_name, ins->name, ops->target.name);
return scnprintf(bf, size, "%-*s *%" PRIx64, max_ins_name, ins->name, ops->target.addr);
}
static struct ins_ops call_ops = {
.parse = call__parse,
.scnprintf = call__scnprintf,
};
bool ins__is_call(const struct ins *ins)
{
return ins->ops == &call_ops || ins->ops == &s390_call_ops;
}
/*
* Prevents from matching commas in the comment section, e.g.:
* ffff200008446e70: b.cs ffff2000084470f4 <generic_exec_single+0x314> // b.hs, b.nlast
*/
static inline const char *validate_comma(const char *c, struct ins_operands *ops)
{
if (ops->raw_comment && c > ops->raw_comment)
return NULL;
return c;
}
static int jump__parse(struct arch *arch, struct ins_operands *ops, struct map_symbol *ms)
{
struct map *map = ms->map;
struct symbol *sym = ms->sym;
struct addr_map_symbol target = {
.ms = { .map = map, },
};
const char *c = strchr(ops->raw, ',');
u64 start, end;
ops->raw_comment = strchr(ops->raw, arch->objdump.comment_char);
c = validate_comma(c, ops);
/*
* Examples of lines to parse for the _cpp_lex_token@@Base
* function:
*
* 1159e6c: jne 115aa32 <_cpp_lex_token@@Base+0xf92>
* 1159e8b: jne c469be <cpp_named_operator2name@@Base+0xa72>
*
* The first is a jump to an offset inside the same function,
* the second is to another function, i.e. that 0xa72 is an
* offset in the cpp_named_operator2name@@base function.
*/
/*
* skip over possible up to 2 operands to get to address, e.g.:
* tbnz w0, #26, ffff0000083cd190 <security_file_permission+0xd0>
*/
if (c++ != NULL) {
ops->target.addr = strtoull(c, NULL, 16);
if (!ops->target.addr) {
c = strchr(c, ',');
c = validate_comma(c, ops);
if (c++ != NULL)
ops->target.addr = strtoull(c, NULL, 16);
}
} else {
ops->target.addr = strtoull(ops->raw, NULL, 16);
}
target.addr = map__objdump_2mem(map, ops->target.addr);
start = map->unmap_ip(map, sym->start),
end = map->unmap_ip(map, sym->end);
ops->target.outside = target.addr < start || target.addr > end;
/*
* FIXME: things like this in _cpp_lex_token (gcc's cc1 program):
cpp_named_operator2name@@Base+0xa72
* Point to a place that is after the cpp_named_operator2name
* boundaries, i.e. in the ELF symbol table for cc1
* cpp_named_operator2name is marked as being 32-bytes long, but it in
* fact is much larger than that, so we seem to need a symbols__find()
* routine that looks for >= current->start and < next_symbol->start,
* possibly just for C++ objects?
*
* For now lets just make some progress by marking jumps to outside the
* current function as call like.
*
* Actual navigation will come next, with further understanding of how
* the symbol searching and disassembly should be done.
*/
if (maps__find_ams(ms->maps, &target) == 0 &&
map__rip_2objdump(target.ms.map, map->map_ip(target.ms.map, target.addr)) == ops->target.addr)
ops->target.sym = target.ms.sym;
if (!ops->target.outside) {
ops->target.offset = target.addr - start;
ops->target.offset_avail = true;
} else {
ops->target.offset_avail = false;
}
return 0;
}
static int jump__scnprintf(struct ins *ins, char *bf, size_t size,
struct ins_operands *ops, int max_ins_name)
{
const char *c;
if (!ops->target.addr || ops->target.offset < 0)
return ins__raw_scnprintf(ins, bf, size, ops, max_ins_name);
if (ops->target.outside && ops->target.sym != NULL)
return scnprintf(bf, size, "%-*s %s", max_ins_name, ins->name, ops->target.sym->name);
c = strchr(ops->raw, ',');
c = validate_comma(c, ops);
if (c != NULL) {
const char *c2 = strchr(c + 1, ',');
c2 = validate_comma(c2, ops);
/* check for 3-op insn */
if (c2 != NULL)
c = c2;
c++;
/* mirror arch objdump's space-after-comma style */
if (*c == ' ')
c++;
}
return scnprintf(bf, size, "%-*s %.*s%" PRIx64, max_ins_name,
ins->name, c ? c - ops->raw : 0, ops->raw,
ops->target.offset);
}
static struct ins_ops jump_ops = {
.parse = jump__parse,
.scnprintf = jump__scnprintf,
};
bool ins__is_jump(const struct ins *ins)
{
return ins->ops == &jump_ops;
}
static int comment__symbol(char *raw, char *comment, u64 *addrp, char **namep)
{
char *endptr, *name, *t;
if (strstr(raw, "(%rip)") == NULL)
return 0;
*addrp = strtoull(comment, &endptr, 16);
if (endptr == comment)
return 0;
name = strchr(endptr, '<');
if (name == NULL)
return -1;
name++;
t = strchr(name, '>');
if (t == NULL)
return 0;
*t = '\0';
*namep = strdup(name);
*t = '>';
return 0;
}
static int lock__parse(struct arch *arch, struct ins_operands *ops, struct map_symbol *ms)
{
ops->locked.ops = zalloc(sizeof(*ops->locked.ops));
if (ops->locked.ops == NULL)
return 0;
if (disasm_line__parse(ops->raw, &ops->locked.ins.name, &ops->locked.ops->raw) < 0)
goto out_free_ops;
ops->locked.ins.ops = ins__find(arch, ops->locked.ins.name);
if (ops->locked.ins.ops == NULL)
goto out_free_ops;
if (ops->locked.ins.ops->parse &&
ops->locked.ins.ops->parse(arch, ops->locked.ops, ms) < 0)
goto out_free_ops;
return 0;
out_free_ops:
zfree(&ops->locked.ops);
return 0;
}
static int lock__scnprintf(struct ins *ins, char *bf, size_t size,
struct ins_operands *ops, int max_ins_name)
{
int printed;
if (ops->locked.ins.ops == NULL)
return ins__raw_scnprintf(ins, bf, size, ops, max_ins_name);
printed = scnprintf(bf, size, "%-*s ", max_ins_name, ins->name);
return printed + ins__scnprintf(&ops->locked.ins, bf + printed,
size - printed, ops->locked.ops, max_ins_name);
}
static void lock__delete(struct ins_operands *ops)
{
struct ins *ins = &ops->locked.ins;
if (ins->ops && ins->ops->free)
ins->ops->free(ops->locked.ops);
else
ins__delete(ops->locked.ops);
zfree(&ops->locked.ops);
zfree(&ops->target.raw);
zfree(&ops->target.name);
}
static struct ins_ops lock_ops = {
.free = lock__delete,
.parse = lock__parse,
.scnprintf = lock__scnprintf,
};
static int mov__parse(struct arch *arch, struct ins_operands *ops, struct map_symbol *ms __maybe_unused)
{
char *s = strchr(ops->raw, ','), *target, *comment, prev;
if (s == NULL)
return -1;
*s = '\0';
ops->source.raw = strdup(ops->raw);
*s = ',';
if (ops->source.raw == NULL)
return -1;
target = ++s;
comment = strchr(s, arch->objdump.comment_char);
if (comment != NULL)
s = comment - 1;
else
s = strchr(s, '\0') - 1;
while (s > target && isspace(s[0]))
--s;
s++;
prev = *s;
*s = '\0';
ops->target.raw = strdup(target);
*s = prev;
if (ops->target.raw == NULL)
goto out_free_source;
if (comment == NULL)
return 0;
comment = skip_spaces(comment);
comment__symbol(ops->source.raw, comment + 1, &ops->source.addr, &ops->source.name);
comment__symbol(ops->target.raw, comment + 1, &ops->target.addr, &ops->target.name);
return 0;
out_free_source:
zfree(&ops->source.raw);
return -1;
}
static int mov__scnprintf(struct ins *ins, char *bf, size_t size,
struct ins_operands *ops, int max_ins_name)
{
return scnprintf(bf, size, "%-*s %s,%s", max_ins_name, ins->name,
ops->source.name ?: ops->source.raw,
ops->target.name ?: ops->target.raw);
}
static struct ins_ops mov_ops = {
.parse = mov__parse,
.scnprintf = mov__scnprintf,
};
static int dec__parse(struct arch *arch __maybe_unused, struct ins_operands *ops, struct map_symbol *ms __maybe_unused)
{
char *target, *comment, *s, prev;
target = s = ops->raw;
while (s[0] != '\0' && !isspace(s[0]))
++s;
prev = *s;
*s = '\0';
ops->target.raw = strdup(target);
*s = prev;
if (ops->target.raw == NULL)
return -1;
comment = strchr(s, arch->objdump.comment_char);
if (comment == NULL)
return 0;
comment = skip_spaces(comment);
comment__symbol(ops->target.raw, comment + 1, &ops->target.addr, &ops->target.name);
return 0;
}
static int dec__scnprintf(struct ins *ins, char *bf, size_t size,
struct ins_operands *ops, int max_ins_name)
{
return scnprintf(bf, size, "%-*s %s", max_ins_name, ins->name,
ops->target.name ?: ops->target.raw);
}
static struct ins_ops dec_ops = {
.parse = dec__parse,
.scnprintf = dec__scnprintf,
};
static int nop__scnprintf(struct ins *ins __maybe_unused, char *bf, size_t size,
struct ins_operands *ops __maybe_unused, int max_ins_name)
{
return scnprintf(bf, size, "%-*s", max_ins_name, "nop");
}
static struct ins_ops nop_ops = {
.scnprintf = nop__scnprintf,
};
static struct ins_ops ret_ops = {
.scnprintf = ins__raw_scnprintf,
};
bool ins__is_ret(const struct ins *ins)
{
return ins->ops == &ret_ops;
}
bool ins__is_lock(const struct ins *ins)
{
return ins->ops == &lock_ops;
}
static int ins__key_cmp(const void *name, const void *insp)
{
const struct ins *ins = insp;
return strcmp(name, ins->name);
}
static int ins__cmp(const void *a, const void *b)
{
const struct ins *ia = a;
const struct ins *ib = b;
return strcmp(ia->name, ib->name);
}
static void ins__sort(struct arch *arch)
{
const int nmemb = arch->nr_instructions;
qsort(arch->instructions, nmemb, sizeof(struct ins), ins__cmp);
}
static struct ins_ops *__ins__find(struct arch *arch, const char *name)
{
struct ins *ins;
const int nmemb = arch->nr_instructions;
if (!arch->sorted_instructions) {
ins__sort(arch);
arch->sorted_instructions = true;
}
ins = bsearch(name, arch->instructions, nmemb, sizeof(struct ins), ins__key_cmp);
return ins ? ins->ops : NULL;
}
static struct ins_ops *ins__find(struct arch *arch, const char *name)
{
struct ins_ops *ops = __ins__find(arch, name);
if (!ops && arch->associate_instruction_ops)
ops = arch->associate_instruction_ops(arch, name);
return ops;
}
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);
}
static struct annotated_source *annotated_source__new(void)
{
struct annotated_source *src = zalloc(sizeof(*src));
if (src != NULL)
INIT_LIST_HEAD(&src->source);
return src;
}
static __maybe_unused void annotated_source__delete(struct annotated_source *src)
{
if (src == NULL)
return;
zfree(&src->histograms);
zfree(&src->cycles_hist);
free(src);
}
static int annotated_source__alloc_histograms(struct annotated_source *src,
size_t size, int nr_hists)
{
size_t sizeof_sym_hist;
/*
* Add buffer of one element for zero length symbol.
* When sample is taken from first instruction of
* zero length symbol, perf still resolves it and
* shows symbol name in perf report and allows to
* annotate it.
*/
if (size == 0)
size = 1;
/* Check for overflow when calculating sizeof_sym_hist */
if (size > (SIZE_MAX - sizeof(struct sym_hist)) / sizeof(struct sym_hist_entry))
return -1;
sizeof_sym_hist = (sizeof(struct sym_hist) + size * sizeof(struct sym_hist_entry));
/* Check for overflow in zalloc argument */
if (sizeof_sym_hist > SIZE_MAX / nr_hists)
return -1;
src->sizeof_sym_hist = sizeof_sym_hist;
src->nr_histograms = nr_hists;
src->histograms = calloc(nr_hists, sizeof_sym_hist) ;
return src->histograms ? 0 : -1;
}
/* The cycles histogram is lazily allocated. */
static int symbol__alloc_hist_cycles(struct symbol *sym)
{
struct annotation *notes = symbol__annotation(sym);
const size_t size = symbol__size(sym);
notes->src->cycles_hist = calloc(size, sizeof(struct cyc_hist));
if (notes->src->cycles_hist == NULL)
return -1;
return 0;
}
void symbol__annotate_zero_histograms(struct symbol *sym)
{
struct annotation *notes = symbol__annotation(sym);
pthread_mutex_lock(&notes->lock);
if (notes->src != NULL) {
memset(notes->src->histograms, 0,
notes->src->nr_histograms * notes->src->sizeof_sym_hist);
if (notes->src->cycles_hist)
memset(notes->src->cycles_hist, 0,
symbol__size(sym) * sizeof(struct cyc_hist));
}
pthread_mutex_unlock(&notes->lock);
}
static int __symbol__account_cycles(struct cyc_hist *ch,
u64 start,
unsigned offset, unsigned cycles,
unsigned have_start)
{
/*
* For now we can only account one basic block per
* final jump. But multiple could be overlapping.
* Always account the longest one. So when
* a shorter one has been already seen throw it away.
*
* We separately always account the full cycles.
*/
ch[offset].num_aggr++;
ch[offset].cycles_aggr += cycles;
if (cycles > ch[offset].cycles_max)
ch[offset].cycles_max = cycles;
if (ch[offset].cycles_min) {
if (cycles && cycles < ch[offset].cycles_min)
ch[offset].cycles_min = cycles;
} else
ch[offset].cycles_min = cycles;
if (!have_start && ch[offset].have_start)
return 0;
if (ch[offset].num) {
if (have_start && (!ch[offset].have_start ||
ch[offset].start > start)) {
ch[offset].have_start = 0;
ch[offset].cycles = 0;
ch[offset].num = 0;
if (ch[offset].reset < 0xffff)
ch[offset].reset++;
} else if (have_start &&
ch[offset].start < start)
return 0;
}
if (ch[offset].num < NUM_SPARKS)
ch[offset].cycles_spark[ch[offset].num] = cycles;
ch[offset].have_start = have_start;
ch[offset].start = start;
ch[offset].cycles += cycles;
ch[offset].num++;
return 0;
}
static int __symbol__inc_addr_samples(struct map_symbol *ms,
struct annotated_source *src, int evidx, u64 addr,
struct perf_sample *sample)
{
struct symbol *sym = ms->sym;
unsigned offset;
struct sym_hist *h;
pr_debug3("%s: addr=%#" PRIx64 "\n", __func__, ms->map->unmap_ip(ms->map, addr));
if ((addr < sym->start || addr >= sym->end) &&
(addr != sym->end || sym->start != sym->end)) {
pr_debug("%s(%d): ERANGE! sym->name=%s, start=%#" PRIx64 ", addr=%#" PRIx64 ", end=%#" PRIx64 "\n",
__func__, __LINE__, sym->name, sym->start, addr, sym->end);
return -ERANGE;
}
offset = addr - sym->start;
h = annotated_source__histogram(src, evidx);
if (h == NULL) {
pr_debug("%s(%d): ENOMEM! sym->name=%s, start=%#" PRIx64 ", addr=%#" PRIx64 ", end=%#" PRIx64 ", func: %d\n",
__func__, __LINE__, sym->name, sym->start, addr, sym->end, sym->type == STT_FUNC);
return -ENOMEM;
}
h->nr_samples++;
h->addr[offset].nr_samples++;
h->period += sample->period;
h->addr[offset].period += sample->period;
pr_debug3("%#" PRIx64 " %s: period++ [addr: %#" PRIx64 ", %#" PRIx64
", evidx=%d] => nr_samples: %" PRIu64 ", period: %" PRIu64 "\n",
sym->start, sym->name, addr, addr - sym->start, evidx,
h->addr[offset].nr_samples, h->addr[offset].period);
return 0;
}
static struct cyc_hist *symbol__cycles_hist(struct symbol *sym)
{
struct annotation *notes = symbol__annotation(sym);
if (notes->src == NULL) {
notes->src = annotated_source__new();
if (notes->src == NULL)
return NULL;
goto alloc_cycles_hist;
}
if (!notes->src->cycles_hist) {
alloc_cycles_hist:
symbol__alloc_hist_cycles(sym);
}
return notes->src->cycles_hist;
}
struct annotated_source *symbol__hists(struct symbol *sym, int nr_hists)
{
struct annotation *notes = symbol__annotation(sym);
if (notes->src == NULL) {
notes->src = annotated_source__new();
if (notes->src == NULL)
return NULL;
goto alloc_histograms;
}
if (notes->src->histograms == NULL) {
alloc_histograms:
annotated_source__alloc_histograms(notes->src, symbol__size(sym),
nr_hists);
}
return notes->src;
}
static int symbol__inc_addr_samples(struct map_symbol *ms,
struct evsel *evsel, u64 addr,
struct perf_sample *sample)
{
struct symbol *sym = ms->sym;
struct annotated_source *src;
if (sym == NULL)
return 0;
src = symbol__hists(sym, evsel->evlist->core.nr_entries);
return src ? __symbol__inc_addr_samples(ms, src, evsel->idx, addr, sample) : 0;
}
static int symbol__account_cycles(u64 addr, u64 start,
struct symbol *sym, unsigned cycles)
{
struct cyc_hist *cycles_hist;
unsigned offset;
if (sym == NULL)
return 0;
cycles_hist = symbol__cycles_hist(sym);
if (cycles_hist == NULL)
return -ENOMEM;
if (addr < sym->start || addr >= sym->end)
return -ERANGE;
if (start) {
if (start < sym->start || start >= sym->end)
return -ERANGE;
if (start >= addr)
start = 0;
}
offset = addr - sym->start;
return __symbol__account_cycles(cycles_hist,
start ? start - sym->start : 0,
offset, cycles,
!!start);
}
int addr_map_symbol__account_cycles(struct addr_map_symbol *ams,
struct addr_map_symbol *start,
unsigned cycles)
{
u64 saddr = 0;
int err;
if (!cycles)
return 0;
/*
* Only set start when IPC can be computed. We can only
* compute it when the basic block is completely in a single
* function.
* Special case the case when the jump is elsewhere, but
* it starts on the function start.
*/
if (start &&
(start->ms.sym == ams->ms.sym ||
(ams->ms.sym &&
start->addr == ams->ms.sym->start + ams->ms.map->start)))
saddr = start->al_addr;
if (saddr == 0)
pr_debug2("BB with bad start: addr %"PRIx64" start %"PRIx64" sym %"PRIx64" saddr %"PRIx64"\n",
ams->addr,
start ? start->addr : 0,
ams->ms.sym ? ams->ms.sym->start + ams->ms.map->start : 0,
saddr);
err = symbol__account_cycles(ams->al_addr, saddr, ams->ms.sym, cycles);
if (err)
pr_debug2("account_cycles failed %d\n", err);
return err;
}
static unsigned annotation__count_insn(struct annotation *notes, u64 start, u64 end)
{
unsigned n_insn = 0;
u64 offset;
for (offset = start; offset <= end; offset++) {
if (notes->offsets[offset])
n_insn++;
}
return n_insn;
}
static void annotation__count_and_fill(struct annotation *notes, u64 start, u64 end, struct cyc_hist *ch)
{
unsigned n_insn;
unsigned int cover_insn = 0;
u64 offset;
n_insn = annotation__count_insn(notes, start, end);
if (n_insn && ch->num && ch->cycles) {
float ipc = n_insn / ((double)ch->cycles / (double)ch->num);
/* Hide data when there are too many overlaps. */
if (ch->reset >= 0x7fff)
return;
for (offset = start; offset <= end; offset++) {
struct annotation_line *al = notes->offsets[offset];
if (al && al->ipc == 0.0) {
al->ipc = ipc;
cover_insn++;
}
}
if (cover_insn) {
notes->hit_cycles += ch->cycles;
notes->hit_insn += n_insn * ch->num;
notes->cover_insn += cover_insn;
}
}
}
void annotation__compute_ipc(struct annotation *notes, size_t size)
{
s64 offset;
if (!notes->src || !notes->src->cycles_hist)
return;
notes->total_insn = annotation__count_insn(notes, 0, size - 1);
notes->hit_cycles = 0;
notes->hit_insn = 0;
notes->cover_insn = 0;
pthread_mutex_lock(&notes->lock);
for (offset = size - 1; offset >= 0; --offset) {
struct cyc_hist *ch;
ch = &notes->src->cycles_hist[offset];
if (ch && ch->cycles) {
struct annotation_line *al;
if (ch->have_start)
annotation__count_and_fill(notes, ch->start, offset, ch);
al = notes->offsets[offset];
if (al && ch->num_aggr) {
al->cycles = ch->cycles_aggr / ch->num_aggr;
al->cycles_max = ch->cycles_max;
al->cycles_min = ch->cycles_min;
}
notes->have_cycles = true;
}
}
pthread_mutex_unlock(&notes->lock);
}
int addr_map_symbol__inc_samples(struct addr_map_symbol *ams, struct perf_sample *sample,
struct evsel *evsel)
{
return symbol__inc_addr_samples(&ams->ms, evsel, ams->al_addr, sample);
}
int hist_entry__inc_addr_samples(struct hist_entry *he, struct perf_sample *sample,
struct evsel *evsel, u64 ip)
{
return symbol__inc_addr_samples(&he->ms, evsel, ip, sample);
}
static void disasm_line__init_ins(struct disasm_line *dl, struct arch *arch, struct map_symbol *ms)
{
dl->ins.ops = ins__find(arch, dl->ins.name);
if (!dl->ins.ops)
return;
if (dl->ins.ops->parse && dl->ins.ops->parse(arch, &dl->ops, ms) < 0)
dl->ins.ops = NULL;
}
static int disasm_line__parse(char *line, const char **namep, char **rawp)
{
char tmp, *name = skip_spaces(line);
if (name[0] == '\0')
return -1;
*rawp = name + 1;
while ((*rawp)[0] != '\0' && !isspace((*rawp)[0]))
++*rawp;
tmp = (*rawp)[0];
(*rawp)[0] = '\0';
*namep = strdup(name);
if (*namep == NULL)
goto out;
(*rawp)[0] = tmp;
*rawp = strim(*rawp);
return 0;
out:
return -1;
}
struct annotate_args {
struct arch *arch;
struct map_symbol ms;
struct evsel *evsel;
struct annotation_options *options;
s64 offset;
char *line;
int line_nr;
};
static void annotation_line__init(struct annotation_line *al,
struct annotate_args *args,
int nr)
{
al->offset = args->offset;
al->line = strdup(args->line);
al->line_nr = args->line_nr;
al->data_nr = nr;
}
static void annotation_line__exit(struct annotation_line *al)
{
free_srcline(al->path);
zfree(&al->line);
}
static size_t disasm_line_size(int nr)
{
struct annotation_line *al;
return (sizeof(struct disasm_line) + (sizeof(al->data[0]) * nr));
}
/*
* Allocating the disasm annotation line data with
* following structure:
*
* -------------------------------------------
* struct disasm_line | struct annotation_line
* -------------------------------------------
*
* We have 'struct annotation_line' member as last member
* of 'struct disasm_line' to have an easy access.
*/
static struct disasm_line *disasm_line__new(struct annotate_args *args)
{
struct disasm_line *dl = NULL;
int nr = 1;
if (evsel__is_group_event(args->evsel))
nr = args->evsel->core.nr_members;
dl = zalloc(disasm_line_size(nr));
if (!dl)
return NULL;
annotation_line__init(&dl->al, args, nr);
if (dl->al.line == NULL)
goto out_delete;
if (args->offset != -1) {
if (disasm_line__parse(dl->al.line, &dl->ins.name, &dl->ops.raw) < 0)
goto out_free_line;
disasm_line__init_ins(dl, args->arch, &args->ms);
}
return dl;
out_free_line:
zfree(&dl->al.line);
out_delete:
free(dl);
return NULL;
}
void disasm_line__free(struct disasm_line *dl)
{
if (dl->ins.ops && dl->ins.ops->free)
dl->ins.ops->free(&dl->ops);
else
ins__delete(&dl->ops);
zfree(&dl->ins.name);
annotation_line__exit(&dl->al);
free(dl);
}
int disasm_line__scnprintf(struct disasm_line *dl, char *bf, size_t size, bool raw, int max_ins_name)
{
if (raw || !dl->ins.ops)
return scnprintf(bf, size, "%-*s %s", max_ins_name, dl->ins.name, dl->ops.raw);
return ins__scnprintf(&dl->ins, bf, size, &dl->ops, max_ins_name);
}
static void annotation_line__add(struct annotation_line *al, struct list_head *head)
{
list_add_tail(&al->node, head);
}
struct annotation_line *
annotation_line__next(struct annotation_line *pos, struct list_head *head)
{
list_for_each_entry_continue(pos, head, node)
if (pos->offset >= 0)
return pos;
return NULL;
}
static const char *annotate__address_color(struct block_range *br)
{
double cov = block_range__coverage(br);
if (cov >= 0) {
/* mark red for >75% coverage */
if (cov > 0.75)
return PERF_COLOR_RED;
/* mark dull for <1% coverage */
if (cov < 0.01)
return PERF_COLOR_NORMAL;
}
return PERF_COLOR_MAGENTA;
}
static const char *annotate__asm_color(struct block_range *br)
{
double cov = block_range__coverage(br);
if (cov >= 0) {
/* mark dull for <1% coverage */
if (cov < 0.01)
return PERF_COLOR_NORMAL;
}
return PERF_COLOR_BLUE;
}
static void annotate__branch_printf(struct block_range *br, u64 addr)
{
bool emit_comment = true;
if (!br)
return;
#if 1
if (br->is_target && br->start == addr) {
struct block_range *branch = br;
double p;
/*
* Find matching branch to our target.
*/
while (!branch->is_branch)
branch = block_range__next(branch);
p = 100 *(double)br->entry / branch->coverage;
if (p > 0.1) {
if (emit_comment) {
emit_comment = false;
printf("\t#");
}
/*
* The percentage of coverage joined at this target in relation
* to the next branch.
*/
printf(" +%.2f%%", p);
}
}
#endif
if (br->is_branch && br->end == addr) {
double p = 100*(double)br->taken / br->coverage;
if (p > 0.1) {
if (emit_comment) {
emit_comment = false;
printf("\t#");
}
/*
* The percentage of coverage leaving at this branch, and
* its prediction ratio.
*/
printf(" -%.2f%% (p:%.2f%%)", p, 100*(double)br->pred / br->taken);
}
}
}
static int disasm_line__print(struct disasm_line *dl, u64 start, int addr_fmt_width)
{
s64 offset = dl->al.offset;
const u64 addr = start + offset;
struct block_range *br;
br = block_range__find(addr);
color_fprintf(stdout, annotate__address_color(br), " %*" PRIx64 ":", addr_fmt_width, addr);
color_fprintf(stdout, annotate__asm_color(br), "%s", dl->al.line);
annotate__branch_printf(br, addr);
return 0;
}
static int
annotation_line__print(struct annotation_line *al, struct symbol *sym, u64 start,
struct evsel *evsel, u64 len, int min_pcnt, int printed,
int max_lines, struct annotation_line *queue, int addr_fmt_width,
int percent_type)
{
struct disasm_line *dl = container_of(al, struct disasm_line, al);
static const char *prev_line;
static const char *prev_color;
if (al->offset != -1) {
double max_percent = 0.0;
int i, nr_percent = 1;
const char *color;
struct annotation *notes = symbol__annotation(sym);
for (i = 0; i < al->data_nr; i++) {
double percent;
percent = annotation_data__percent(&al->data[i],
percent_type);
if (percent > max_percent)
max_percent = percent;
}
if (al->data_nr > nr_percent)
nr_percent = al->data_nr;
if (max_percent < min_pcnt)
return -1;
if (max_lines && printed >= max_lines)
return 1;
if (queue != NULL) {
list_for_each_entry_from(queue, &notes->src->source, node) {
if (queue == al)
break;
annotation_line__print(queue, sym, start, evsel, len,
0, 0, 1, NULL, addr_fmt_width,
percent_type);
}
}
color = get_percent_color(max_percent);
/*
* Also color the filename and line if needed, with
* the same color than the percentage. Don't print it
* twice for close colored addr with the same filename:line
*/
if (al->path) {
if (!prev_line || strcmp(prev_line, al->path)
|| color != prev_color) {
color_fprintf(stdout, color, " %s", al->path);
prev_line = al->path;
prev_color = color;
}
}
for (i = 0; i < nr_percent; i++) {
struct annotation_data *data = &al->data[i];
double percent;
percent = annotation_data__percent(data, percent_type);
color = get_percent_color(percent);
if (symbol_conf.show_total_period)
color_fprintf(stdout, color, " %11" PRIu64,
data->he.period);
else if (symbol_conf.show_nr_samples)
color_fprintf(stdout, color, " %7" PRIu64,
data->he.nr_samples);
else
color_fprintf(stdout, color, " %7.2f", percent);
}
printf(" : ");
disasm_line__print(dl, start, addr_fmt_width);
printf("\n");
} else if (max_lines && printed >= max_lines)
return 1;
else {
int width = symbol_conf.show_total_period ? 12 : 8;
if (queue)
return -1;
if (evsel__is_group_event(evsel))
width *= evsel->core.nr_members;
if (!*al->line)
printf(" %*s:\n", width, " ");
else
printf(" %*s: %*s %s\n", width, " ", addr_fmt_width, " ", al->line);
}
return 0;
}
/*
* symbol__parse_objdump_line() parses objdump output (with -d --no-show-raw)
* which looks like following
*
* 0000000000415500 <_init>:
* 415500: sub $0x8,%rsp
* 415504: mov 0x2f5ad5(%rip),%rax # 70afe0 <_DYNAMIC+0x2f8>
* 41550b: test %rax,%rax
* 41550e: je 415515 <_init+0x15>
* 415510: callq 416e70 <__gmon_start__@plt>
* 415515: add $0x8,%rsp
* 415519: retq
*
* it will be parsed and saved into struct disasm_line as
* <offset> <name> <ops.raw>
*
* The offset will be a relative offset from the start of the symbol and -1
* means that it's not a disassembly line so should be treated differently.
* The ops.raw part will be parsed further according to type of the instruction.
*/
static int symbol__parse_objdump_line(struct symbol *sym,
struct annotate_args *args,
char *parsed_line, int *line_nr)
{
struct map *map = args->ms.map;
struct annotation *notes = symbol__annotation(sym);
struct disasm_line *dl;
char *tmp;
s64 line_ip, offset = -1;
regmatch_t match[2];
/* /filename:linenr ? Save line number and ignore. */
if (regexec(&file_lineno, parsed_line, 2, match, 0) == 0) {
*line_nr = atoi(parsed_line + match[1].rm_so);
return 0;
}
/* Process hex address followed by ':'. */
line_ip = strtoull(parsed_line, &tmp, 16);
if (parsed_line != tmp && tmp[0] == ':' && tmp[1] != '\0') {
u64 start = map__rip_2objdump(map, sym->start),
end = map__rip_2objdump(map, sym->end);
offset = line_ip - start;
if ((u64)line_ip < start || (u64)line_ip >= end)
offset = -1;
else
parsed_line = tmp + 1;
}
args->offset = offset;
args->line = parsed_line;
args->line_nr = *line_nr;
args->ms.sym = sym;
dl = disasm_line__new(args);
(*line_nr)++;
if (dl == NULL)
return -1;
if (!disasm_line__has_local_offset(dl)) {
dl->ops.target.offset = dl->ops.target.addr -
map__rip_2objdump(map, sym->start);
dl->ops.target.offset_avail = true;
}
/* kcore has no symbols, so add the call target symbol */
if (dl->ins.ops && ins__is_call(&dl->ins) && !dl->ops.target.sym) {
struct addr_map_symbol target = {
.addr = dl->ops.target.addr,
.ms = { .map = map, },
};
if (!maps__find_ams(args->ms.maps, &target) &&
target.ms.sym->start == target.al_addr)
dl->ops.target.sym = target.ms.sym;
}
annotation_line__add(&dl->al, &notes->src->source);
return 0;
}
static __attribute__((constructor)) void symbol__init_regexpr(void)
{
regcomp(&file_lineno, "^/[^:]+:([0-9]+)", REG_EXTENDED);
}
static void delete_last_nop(struct symbol *sym)
{
struct annotation *notes = symbol__annotation(sym);
struct list_head *list = &notes->src->source;
struct disasm_line *dl;
while (!list_empty(list)) {
dl = list_entry(list->prev, struct disasm_line, al.node);
if (dl->ins.ops) {
if (dl->ins.ops != &nop_ops)
return;
} else {
if (!strstr(dl->al.line, " nop ") &&
!strstr(dl->al.line, " nopl ") &&
!strstr(dl->al.line, " nopw "))
return;
}
list_del_init(&dl->al.node);
disasm_line__free(dl);
}
}
int symbol__strerror_disassemble(struct map_symbol *ms, int errnum, char *buf, size_t buflen)
{
struct dso *dso = ms->map->dso;
BUG_ON(buflen == 0);
if (errnum >= 0) {
str_error_r(errnum, buf, buflen);
return 0;
}
switch (errnum) {
case SYMBOL_ANNOTATE_ERRNO__NO_VMLINUX: {
char bf[SBUILD_ID_SIZE + 15] = " with build id ";
char *build_id_msg = NULL;
if (dso->has_build_id) {
build_id__sprintf(dso->build_id,
sizeof(dso->build_id), bf + 15);
build_id_msg = bf;
}
scnprintf(buf, buflen,
"No vmlinux file%s\nwas found in the path.\n\n"
"Note that annotation using /proc/kcore requires CAP_SYS_RAWIO capability.\n\n"
"Please use:\n\n"
" perf buildid-cache -vu vmlinux\n\n"
"or:\n\n"
" --vmlinux vmlinux\n", build_id_msg ?: "");
}
break;
case SYMBOL_ANNOTATE_ERRNO__NO_LIBOPCODES_FOR_BPF:
scnprintf(buf, buflen, "Please link with binutils's libopcode to enable BPF annotation");
break;
case SYMBOL_ANNOTATE_ERRNO__ARCH_INIT_REGEXP:
scnprintf(buf, buflen, "Problems with arch specific instruction name regular expressions.");
break;
case SYMBOL_ANNOTATE_ERRNO__ARCH_INIT_CPUID_PARSING:
scnprintf(buf, buflen, "Problems while parsing the CPUID in the arch specific initialization.");
break;
case SYMBOL_ANNOTATE_ERRNO__BPF_INVALID_FILE:
scnprintf(buf, buflen, "Invalid BPF file: %s.", dso->long_name);
break;
case SYMBOL_ANNOTATE_ERRNO__BPF_MISSING_BTF:
scnprintf(buf, buflen, "The %s BPF file has no BTF section, compile with -g or use pahole -J.",
dso->long_name);
break;
default:
scnprintf(buf, buflen, "Internal error: Invalid %d error code\n", errnum);
break;
}
return 0;
}
static int dso__disassemble_filename(struct dso *dso, char *filename, size_t filename_size)
{
char linkname[PATH_MAX];
char *build_id_filename;
char *build_id_path = NULL;
char *pos;
int len;
if (dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS &&
!dso__is_kcore(dso))
return SYMBOL_ANNOTATE_ERRNO__NO_VMLINUX;
build_id_filename = dso__build_id_filename(dso, NULL, 0, false);
if (build_id_filename) {
__symbol__join_symfs(filename, filename_size, build_id_filename);
free(build_id_filename);
} else {
if (dso->has_build_id)
return ENOMEM;
goto fallback;
}
build_id_path = strdup(filename);
if (!build_id_path)
return ENOMEM;
/*
* old style build-id cache has name of XX/XXXXXXX.. while
* new style has XX/XXXXXXX../{elf,kallsyms,vdso}.
* extract the build-id part of dirname in the new style only.
*/
pos = strrchr(build_id_path, '/');
if (pos && strlen(pos) < SBUILD_ID_SIZE - 2)
dirname(build_id_path);
if (dso__is_kcore(dso))
goto fallback;
len = readlink(build_id_path, linkname, sizeof(linkname) - 1);
if (len < 0)
goto fallback;
linkname[len] = '\0';
if (strstr(linkname, DSO__NAME_KALLSYMS) ||
access(filename, R_OK)) {
fallback:
/*
* If we don't have build-ids or the build-id file isn't in the
* cache, or is just a kallsyms file, well, lets hope that this
* DSO is the same as when 'perf record' ran.
*/
__symbol__join_symfs(filename, filename_size, dso->long_name);
}
free(build_id_path);
return 0;
}
#if defined(HAVE_LIBBFD_SUPPORT) && defined(HAVE_LIBBPF_SUPPORT)
#define PACKAGE "perf"
#include <bfd.h>
#include <dis-asm.h>
static int symbol__disassemble_bpf(struct symbol *sym,
struct annotate_args *args)
{
struct annotation *notes = symbol__annotation(sym);
struct annotation_options *opts = args->options;
struct bpf_prog_info_linear *info_linear;
struct bpf_prog_linfo *prog_linfo = NULL;
struct bpf_prog_info_node *info_node;
int len = sym->end - sym->start;
disassembler_ftype disassemble;
struct map *map = args->ms.map;
struct disassemble_info info;
struct dso *dso = map->dso;
int pc = 0, count, sub_id;
struct btf *btf = NULL;
char tpath[PATH_MAX];
size_t buf_size;
int nr_skip = 0;
char *buf;
bfd *bfdf;
int ret;
FILE *s;
if (dso->binary_type != DSO_BINARY_TYPE__BPF_PROG_INFO)
return SYMBOL_ANNOTATE_ERRNO__BPF_INVALID_FILE;
pr_debug("%s: handling sym %s addr %" PRIx64 " len %" PRIx64 "\n", __func__,
sym->name, sym->start, sym->end - sym->start);
memset(tpath, 0, sizeof(tpath));
perf_exe(tpath, sizeof(tpath));
bfdf = bfd_openr(tpath, NULL);
assert(bfdf);
assert(bfd_check_format(bfdf, bfd_object));
s = open_memstream(&buf, &buf_size);
if (!s) {
ret = errno;
goto out;
}
init_disassemble_info(&info, s,
(fprintf_ftype) fprintf);
info.arch = bfd_get_arch(bfdf);
info.mach = bfd_get_mach(bfdf);
info_node = perf_env__find_bpf_prog_info(dso->bpf_prog.env,
dso->bpf_prog.id);
if (!info_node) {
ret = SYMBOL_ANNOTATE_ERRNO__BPF_MISSING_BTF;
goto out;
}
info_linear = info_node->info_linear;
sub_id = dso->bpf_prog.sub_id;
info.buffer = (void *)(uintptr_t)(info_linear->info.jited_prog_insns);
info.buffer_length = info_linear->info.jited_prog_len;
if (info_linear->info.nr_line_info)
prog_linfo = bpf_prog_linfo__new(&info_linear->info);
if (info_linear->info.btf_id) {
struct btf_node *node;
node = perf_env__find_btf(dso->bpf_prog.env,
info_linear->info.btf_id);
if (node)
btf = btf__new((__u8 *)(node->data),
node->data_size);
}
disassemble_init_for_target(&info);
#ifdef DISASM_FOUR_ARGS_SIGNATURE
disassemble = disassembler(info.arch,
bfd_big_endian(bfdf),
info.mach,
bfdf);
#else
disassemble = disassembler(bfdf);
#endif
assert(disassemble);
fflush(s);
do {
const struct bpf_line_info *linfo = NULL;
struct disasm_line *dl;
size_t prev_buf_size;
const char *srcline;
u64 addr;
addr = pc + ((u64 *)(uintptr_t)(info_linear->info.jited_ksyms))[sub_id];
count = disassemble(pc, &info);
if (prog_linfo)
linfo = bpf_prog_linfo__lfind_addr_func(prog_linfo,
addr, sub_id,
nr_skip);
if (linfo && btf) {
srcline = btf__name_by_offset(btf, linfo->line_off);
nr_skip++;
} else
srcline = NULL;
fprintf(s, "\n");
prev_buf_size = buf_size;
fflush(s);
if (!opts->hide_src_code && srcline) {
args->offset = -1;
args->line = strdup(srcline);
args->line_nr = 0;
args->ms.sym = sym;
dl = disasm_line__new(args);
if (dl) {
annotation_line__add(&dl->al,
&notes->src->source);
}
}
args->offset = pc;
args->line = buf + prev_buf_size;
args->line_nr = 0;
args->ms.sym = sym;
dl = disasm_line__new(args);
if (dl)
annotation_line__add(&dl->al, &notes->src->source);
pc += count;
} while (count > 0 && pc < len);
ret = 0;
out:
free(prog_linfo);
free(btf);
fclose(s);
bfd_close(bfdf);
return ret;
}
#else // defined(HAVE_LIBBFD_SUPPORT) && defined(HAVE_LIBBPF_SUPPORT)
static int symbol__disassemble_bpf(struct symbol *sym __maybe_unused,
struct annotate_args *args __maybe_unused)
{
return SYMBOL_ANNOTATE_ERRNO__NO_LIBOPCODES_FOR_BPF;
}
#endif // defined(HAVE_LIBBFD_SUPPORT) && defined(HAVE_LIBBPF_SUPPORT)
static int
symbol__disassemble_bpf_image(struct symbol *sym,
struct annotate_args *args)
{
struct annotation *notes = symbol__annotation(sym);
struct disasm_line *dl;
args->offset = -1;
args->line = strdup("to be implemented");
args->line_nr = 0;
dl = disasm_line__new(args);
if (dl)
annotation_line__add(&dl->al, &notes->src->source);
free(args->line);
return 0;
}
/*
* Possibly create a new version of line with tabs expanded. Returns the
* existing or new line, storage is updated if a new line is allocated. If
* allocation fails then NULL is returned.
*/
static char *expand_tabs(char *line, char **storage, size_t *storage_len)
{
size_t i, src, dst, len, new_storage_len, num_tabs;
char *new_line;
size_t line_len = strlen(line);
for (num_tabs = 0, i = 0; i < line_len; i++)
if (line[i] == '\t')
num_tabs++;
if (num_tabs == 0)
return line;
/*
* Space for the line and '\0', less the leading and trailing
* spaces. Each tab may introduce 7 additional spaces.
*/
new_storage_len = line_len + 1 + (num_tabs * 7);
new_line = malloc(new_storage_len);
if (new_line == NULL) {
pr_err("Failure allocating memory for tab expansion\n");
return NULL;
}
/*
* Copy regions starting at src and expand tabs. If there are two
* adjacent tabs then 'src == i', the memcpy is of size 0 and the spaces
* are inserted.
*/
for (i = 0, src = 0, dst = 0; i < line_len && num_tabs; i++) {
if (line[i] == '\t') {
len = i - src;
memcpy(&new_line[dst], &line[src], len);
dst += len;
new_line[dst++] = ' ';
while (dst % 8 != 0)
new_line[dst++] = ' ';
src = i + 1;
num_tabs--;
}
}
/* Expand the last region. */
len = line_len - src;
memcpy(&new_line[dst], &line[src], len);
dst += len;
new_line[dst] = '\0';
free(*storage);
*storage = new_line;
*storage_len = new_storage_len;
return new_line;
}
static int symbol__disassemble(struct symbol *sym, struct annotate_args *args)
{
struct annotation_options *opts = args->options;
struct map *map = args->ms.map;
struct dso *dso = map->dso;
char *command;
FILE *file;
char symfs_filename[PATH_MAX];
struct kcore_extract kce;
bool delete_extract = false;
bool decomp = false;
int lineno = 0;
int nline;
char *line;
size_t line_len;
const char *objdump_argv[] = {
"/bin/sh",
"-c",
NULL, /* Will be the objdump command to run. */
"--",
NULL, /* Will be the symfs path. */
NULL,
};
struct child_process objdump_process;
int err = dso__disassemble_filename(dso, symfs_filename, sizeof(symfs_filename));
if (err)
return err;
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));
pr_debug("annotating [%p] %30s : [%p] %30s\n",
dso, dso->long_name, sym, sym->name);
if (dso->binary_type == DSO_BINARY_TYPE__BPF_PROG_INFO) {
return symbol__disassemble_bpf(sym, args);
} else if (dso->binary_type == DSO_BINARY_TYPE__BPF_IMAGE) {
return symbol__disassemble_bpf_image(sym, args);
} else if (dso__is_kcore(dso)) {
kce.kcore_filename = symfs_filename;
kce.addr = map__rip_2objdump(map, sym->start);
kce.offs = sym->start;
kce.len = sym->end - sym->start;
if (!kcore_extract__create(&kce)) {
delete_extract = true;
strlcpy(symfs_filename, kce.extract_filename,
sizeof(symfs_filename));
}
} else if (dso__needs_decompress(dso)) {
char tmp[KMOD_DECOMP_LEN];
if (dso__decompress_kmodule_path(dso, symfs_filename,
tmp, sizeof(tmp)) < 0)
return -1;
decomp = true;
strcpy(symfs_filename, tmp);
}
err = asprintf(&command,
"%s %s%s --start-address=0x%016" PRIx64
" --stop-address=0x%016" PRIx64
" -l -d %s %s %s %c%s%c %s%s -C \"$1\"",
opts->objdump_path ?: "objdump",
opts->disassembler_style ? "-M " : "",
opts->disassembler_style ?: "",
map__rip_2objdump(map, sym->start),
map__rip_2objdump(map, sym->end),
opts->show_asm_raw ? "" : "--no-show-raw-insn",
opts->annotate_src ? "-S" : "",
opts->prefix ? "--prefix " : "",
opts->prefix ? '"' : ' ',
opts->prefix ?: "",
opts->prefix ? '"' : ' ',
opts->prefix_strip ? "--prefix-strip=" : "",
opts->prefix_strip ?: "");
if (err < 0) {
pr_err("Failure allocating memory for the command to run\n");
goto out_remove_tmp;
}
pr_debug("Executing: %s\n", command);
objdump_argv[2] = command;
objdump_argv[4] = symfs_filename;
/* Create a pipe to read from for stdout */
memset(&objdump_process, 0, sizeof(objdump_process));
objdump_process.argv = objdump_argv;
objdump_process.out = -1;
if (start_command(&objdump_process)) {
pr_err("Failure starting to run %s\n", command);
err = -1;
goto out_free_command;
}
file = fdopen(objdump_process.out, "r");
if (!file) {
pr_err("Failure creating FILE stream for %s\n", command);
/*
* If we were using debug info should retry with
* original binary.
*/
err = -1;
goto out_close_stdout;
}
/* Storage for getline. */
line = NULL;
line_len = 0;
nline = 0;
while (!feof(file)) {
const char *match;
char *expanded_line;
if (getline(&line, &line_len, file) < 0 || !line)
break;
/* Skip lines containing "filename:" */
match = strstr(line, symfs_filename);
if (match && match[strlen(symfs_filename)] == ':')
continue;
expanded_line = strim(line);
expanded_line = expand_tabs(expanded_line, &line, &line_len);
if (!expanded_line)
break;
/*
* The source code line number (lineno) needs to be kept in
* across calls to symbol__parse_objdump_line(), so that it
* can associate it with the instructions till the next one.
* See disasm_line__new() and struct disasm_line::line_nr.
*/
if (symbol__parse_objdump_line(sym, args, expanded_line,
&lineno) < 0)
break;
nline++;
}
free(line);
err = finish_command(&objdump_process);
if (err)
pr_err("Error running %s\n", command);
if (nline == 0) {
err = -1;
pr_err("No output from %s\n", command);
}
/*
* kallsyms does not have symbol sizes so there may a nop at the end.
* Remove it.
*/
if (dso__is_kcore(dso))
delete_last_nop(sym);
fclose(file);
out_close_stdout:
close(objdump_process.out);
out_free_command:
free(command);
out_remove_tmp:
if (decomp)
unlink(symfs_filename);
if (delete_extract)
kcore_extract__delete(&kce);
return err;
}
static void calc_percent(struct sym_hist *sym_hist,
struct hists *hists,
struct annotation_data *data,
s64 offset, s64 end)
{
unsigned int hits = 0;
u64 period = 0;
while (offset < end) {
hits += sym_hist->addr[offset].nr_samples;
period += sym_hist->addr[offset].period;
++offset;
}
if (sym_hist->nr_samples) {
data->he.period = period;
data->he.nr_samples = hits;
data->percent[PERCENT_HITS_LOCAL] = 100.0 * hits / sym_hist->nr_samples;
}
if (hists->stats.nr_non_filtered_samples)
data->percent[PERCENT_HITS_GLOBAL] = 100.0 * hits / hists->stats.nr_non_filtered_samples;
if (sym_hist->period)
data->percent[PERCENT_PERIOD_LOCAL] = 100.0 * period / sym_hist->period;
if (hists->stats.total_period)
data->percent[PERCENT_PERIOD_GLOBAL] = 100.0 * period / hists->stats.total_period;
}
static void annotation__calc_percent(struct annotation *notes,
struct evsel *leader, s64 len)
{
struct annotation_line *al, *next;
struct evsel *evsel;
list_for_each_entry(al, &notes->src->source, node) {
s64 end;
int i = 0;
if (al->offset == -1)
continue;
next = annotation_line__next(al, &notes->src->source);
end = next ? next->offset : len;
for_each_group_evsel(evsel, leader) {
struct hists *hists = evsel__hists(evsel);
struct annotation_data *data;
struct sym_hist *sym_hist;
BUG_ON(i >= al->data_nr);
sym_hist = annotation__histogram(notes, evsel->idx);
data = &al->data[i++];
calc_percent(sym_hist, hists, data, al->offset, end);
}
}
}
void symbol__calc_percent(struct symbol *sym, struct evsel *evsel)
{
struct annotation *notes = symbol__annotation(sym);
annotation__calc_percent(notes, evsel, symbol__size(sym));
}
int symbol__annotate(struct map_symbol *ms, struct evsel *evsel,
struct annotation_options *options, struct arch **parch)
{
struct symbol *sym = ms->sym;
struct annotation *notes = symbol__annotation(sym);
struct annotate_args args = {
.evsel = evsel,
.options = options,
};
struct perf_env *env = evsel__env(evsel);
const char *arch_name = perf_env__arch(env);
struct arch *arch;
int err;
if (!arch_name)
return errno;
args.arch = arch = arch__find(arch_name);
if (arch == NULL)
return ENOTSUP;
if (parch)
*parch = arch;
if (arch->init) {
err = arch->init(arch, env ? env->cpuid : NULL);
if (err) {
pr_err("%s: failed to initialize %s arch priv area\n", __func__, arch->name);
return err;
}
}
args.ms = *ms;
notes->start = map__rip_2objdump(ms->map, sym->start);
return symbol__disassemble(sym, &args);
}
static void insert_source_line(struct rb_root *root, struct annotation_line *al,
struct annotation_options *opts)
{
struct annotation_line *iter;
struct rb_node **p = &root->rb_node;
struct rb_node *parent = NULL;
int i, ret;
while (*p != NULL) {
parent = *p;
iter = rb_entry(parent, struct annotation_line, rb_node);
ret = strcmp(iter->path, al->path);
if (ret == 0) {
for (i = 0; i < al->data_nr; i++) {
iter->data[i].percent_sum += annotation_data__percent(&al->data[i],
opts->percent_type);
}
return;
}
if (ret < 0)
p = &(*p)->rb_left;
else
p = &(*p)->rb_right;
}
for (i = 0; i < al->data_nr; i++) {
al->data[i].percent_sum = annotation_data__percent(&al->data[i],
opts->percent_type);
}
rb_link_node(&al->rb_node, parent, p);
rb_insert_color(&al->rb_node, root);
}
static int cmp_source_line(struct annotation_line *a, struct annotation_line *b)
{
int i;
for (i = 0; i < a->data_nr; i++) {
if (a->data[i].percent_sum == b->data[i].percent_sum)
continue;
return a->data[i].percent_sum > b->data[i].percent_sum;
}
return 0;
}
static void __resort_source_line(struct rb_root *root, struct annotation_line *al)
{
struct annotation_line *iter;
struct rb_node **p = &root->rb_node;
struct rb_node *parent = NULL;
while (*p != NULL) {
parent = *p;
iter = rb_entry(parent, struct annotation_line, rb_node);
if (cmp_source_line(al, iter))
p = &(*p)->rb_left;
else
p = &(*p)->rb_right;
}
rb_link_node(&al->rb_node, parent, p);
rb_insert_color(&al->rb_node, root);
}
static void resort_source_line(struct rb_root *dest_root, struct rb_root *src_root)
{
struct annotation_line *al;
struct rb_node *node;
node = rb_first(src_root);
while (node) {
struct rb_node *next;
al = rb_entry(node, struct annotation_line, rb_node);
next = rb_next(node);
rb_erase(node, src_root);
__resort_source_line(dest_root, al);
node = next;
}
}
static void print_summary(struct rb_root *root, const char *filename)
{
struct annotation_line *al;
struct rb_node *node;
printf("\nSorted summary for file %s\n", filename);
printf("----------------------------------------------\n\n");
if (RB_EMPTY_ROOT(root)) {
printf(" Nothing higher than %1.1f%%\n", MIN_GREEN);
return;
}
node = rb_first(root);
while (node) {
double percent, percent_max = 0.0;
const char *color;
char *path;
int i;
al = rb_entry(node, struct annotation_line, rb_node);
for (i = 0; i < al->data_nr; i++) {
percent = al->data[i].percent_sum;
color = get_percent_color(percent);
color_fprintf(stdout, color, " %7.2f", percent);
if (percent > percent_max)
percent_max = percent;
}
path = al->path;
color = get_percent_color(percent_max);
color_fprintf(stdout, color, " %s\n", path);
node = rb_next(node);
}
}
static void symbol__annotate_hits(struct symbol *sym, struct evsel *evsel)
{
struct annotation *notes = symbol__annotation(sym);
struct sym_hist *h = annotation__histogram(notes, evsel->idx);
u64 len = symbol__size(sym), offset;
for (offset = 0; offset < len; ++offset)
if (h->addr[offset].nr_samples != 0)
printf("%*" PRIx64 ": %" PRIu64 "\n", BITS_PER_LONG / 2,
sym->start + offset, h->addr[offset].nr_samples);
printf("%*s: %" PRIu64 "\n", BITS_PER_LONG / 2, "h->nr_samples", h->nr_samples);
}
static int annotated_source__addr_fmt_width(struct list_head *lines, u64 start)
{
char bf[32];
struct annotation_line *line;
list_for_each_entry_reverse(line, lines, node) {
if (line->offset != -1)
return scnprintf(bf, sizeof(bf), "%" PRIx64, start + line->offset);
}
return 0;
}
int symbol__annotate_printf(struct map_symbol *ms, struct evsel *evsel,
struct annotation_options *opts)
{
struct map *map = ms->map;
struct symbol *sym = ms->sym;
struct dso *dso = map->dso;
char *filename;
const char *d_filename;
const char *evsel_name = evsel__name(evsel);
struct annotation *notes = symbol__annotation(sym);
struct sym_hist *h = annotation__histogram(notes, evsel->idx);
struct annotation_line *pos, *queue = NULL;
u64 start = map__rip_2objdump(map, sym->start);
int printed = 2, queue_len = 0, addr_fmt_width;
int more = 0;
bool context = opts->context;
u64 len;
int width = symbol_conf.show_total_period ? 12 : 8;
int graph_dotted_len;
char buf[512];
filename = strdup(dso->long_name);
if (!filename)
return -ENOMEM;
if (opts->full_path)
d_filename = filename;
else
d_filename = basename(filename);
len = symbol__size(sym);
if (evsel__is_group_event(evsel)) {
width *= evsel->core.nr_members;
evsel__group_desc(evsel, buf, sizeof(buf));
evsel_name = buf;
}
graph_dotted_len = printf(" %-*.*s| Source code & Disassembly of %s for %s (%" PRIu64 " samples, "
"percent: %s)\n",
width, width, symbol_conf.show_total_period ? "Period" :
symbol_conf.show_nr_samples ? "Samples" : "Percent",
d_filename, evsel_name, h->nr_samples,
percent_type_str(opts->percent_type));
printf("%-*.*s----\n",
graph_dotted_len, graph_dotted_len, graph_dotted_line);
if (verbose > 0)
symbol__annotate_hits(sym, evsel);
addr_fmt_width = annotated_source__addr_fmt_width(&notes->src->source, start);
list_for_each_entry(pos, &notes->src->source, node) {
int err;
if (context && queue == NULL) {
queue = pos;
queue_len = 0;
}
err = annotation_line__print(pos, sym, start, evsel, len,
opts->min_pcnt, printed, opts->max_lines,
queue, addr_fmt_width, opts->percent_type);
switch (err) {
case 0:
++printed;
if (context) {
printed += queue_len;
queue = NULL;
queue_len = 0;
}
break;
case 1:
/* filtered by max_lines */
++more;
break;
case -1:
default:
/*
* Filtered by min_pcnt or non IP lines when
* context != 0
*/
if (!context)
break;
if (queue_len == context)
queue = list_entry(queue->node.next, typeof(*queue), node);
else
++queue_len;
break;
}
}
free(filename);
return more;
}
static void FILE__set_percent_color(void *fp __maybe_unused,
double percent __maybe_unused,
bool current __maybe_unused)
{
}
static int FILE__set_jumps_percent_color(void *fp __maybe_unused,
int nr __maybe_unused, bool current __maybe_unused)
{
return 0;
}
static int FILE__set_color(void *fp __maybe_unused, int color __maybe_unused)
{
return 0;
}
static void FILE__printf(void *fp, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
vfprintf(fp, fmt, args);
va_end(args);
}
static void FILE__write_graph(void *fp, int graph)
{
const char *s;
switch (graph) {
case DARROW_CHAR: s = "↓"; break;
case UARROW_CHAR: s = "↑"; break;
case LARROW_CHAR: s = "←"; break;
case RARROW_CHAR: s = "→"; break;
default: s = "?"; break;
}
fputs(s, fp);
}
static int symbol__annotate_fprintf2(struct symbol *sym, FILE *fp,
struct annotation_options *opts)
{
struct annotation *notes = symbol__annotation(sym);
struct annotation_write_ops wops = {
.first_line = true,
.obj = fp,
.set_color = FILE__set_color,
.set_percent_color = FILE__set_percent_color,
.set_jumps_percent_color = FILE__set_jumps_percent_color,
.printf = FILE__printf,
.write_graph = FILE__write_graph,
};
struct annotation_line *al;
list_for_each_entry(al, &notes->src->source, node) {
if (annotation_line__filter(al, notes))
continue;
annotation_line__write(al, notes, &wops, opts);
fputc('\n', fp);
wops.first_line = false;
}
return 0;
}
int map_symbol__annotation_dump(struct map_symbol *ms, struct evsel *evsel,
struct annotation_options *opts)
{
const char *ev_name = evsel__name(evsel);
char buf[1024];
char *filename;
int err = -1;
FILE *fp;
if (asprintf(&filename, "%s.annotation", ms->sym->name) < 0)
return -1;
fp = fopen(filename, "w");
if (fp == NULL)
goto out_free_filename;
if (evsel__is_group_event(evsel)) {
evsel__group_desc(evsel, buf, sizeof(buf));
ev_name = buf;
}
fprintf(fp, "%s() %s\nEvent: %s\n\n",
ms->sym->name, ms->map->dso->long_name, ev_name);
symbol__annotate_fprintf2(ms->sym, fp, opts);
fclose(fp);
err = 0;
out_free_filename:
free(filename);
return err;
}
void symbol__annotate_zero_histogram(struct symbol *sym, int evidx)
{
struct annotation *notes = symbol__annotation(sym);
struct sym_hist *h = annotation__histogram(notes, evidx);
memset(h, 0, notes->src->sizeof_sym_hist);
}
void symbol__annotate_decay_histogram(struct symbol *sym, int evidx)
{
struct annotation *notes = symbol__annotation(sym);
struct sym_hist *h = annotation__histogram(notes, evidx);
int len = symbol__size(sym), offset;
h->nr_samples = 0;
for (offset = 0; offset < len; ++offset) {
h->addr[offset].nr_samples = h->addr[offset].nr_samples * 7 / 8;
h->nr_samples += h->addr[offset].nr_samples;
}
}
void annotated_source__purge(struct annotated_source *as)
{
struct annotation_line *al, *n;
list_for_each_entry_safe(al, n, &as->source, node) {
list_del_init(&al->node);
disasm_line__free(disasm_line(al));
}
}
static size_t disasm_line__fprintf(struct disasm_line *dl, FILE *fp)
{
size_t printed;
if (dl->al.offset == -1)
return fprintf(fp, "%s\n", dl->al.line);
printed = fprintf(fp, "%#" PRIx64 " %s", dl->al.offset, dl->ins.name);
if (dl->ops.raw[0] != '\0') {
printed += fprintf(fp, "%.*s %s\n", 6 - (int)printed, " ",
dl->ops.raw);
}
return printed + fprintf(fp, "\n");
}
size_t disasm__fprintf(struct list_head *head, FILE *fp)
{
struct disasm_line *pos;
size_t printed = 0;
list_for_each_entry(pos, head, al.node)
printed += disasm_line__fprintf(pos, fp);
return printed;
}
bool disasm_line__is_valid_local_jump(struct disasm_line *dl, struct symbol *sym)
{
if (!dl || !dl->ins.ops || !ins__is_jump(&dl->ins) ||
!disasm_line__has_local_offset(dl) || dl->ops.target.offset < 0 ||
dl->ops.target.offset >= (s64)symbol__size(sym))
return false;
return true;
}
void annotation__mark_jump_targets(struct annotation *notes, struct symbol *sym)
{
u64 offset, size = symbol__size(sym);
/* PLT symbols contain external offsets */
if (strstr(sym->name, "@plt"))
return;
for (offset = 0; offset < size; ++offset) {
struct annotation_line *al = notes->offsets[offset];
struct disasm_line *dl;
dl = disasm_line(al);
if (!disasm_line__is_valid_local_jump(dl, sym))
continue;
al = notes->offsets[dl->ops.target.offset];
/*
* FIXME: Oops, no jump target? Buggy disassembler? Or do we
* have to adjust to the previous offset?
*/
if (al == NULL)
continue;
if (++al->jump_sources > notes->max_jump_sources)
notes->max_jump_sources = al->jump_sources;
}
}
void annotation__set_offsets(struct annotation *notes, s64 size)
{
struct annotation_line *al;
notes->max_line_len = 0;
notes->nr_entries = 0;
notes->nr_asm_entries = 0;
list_for_each_entry(al, &notes->src->source, node) {
size_t line_len = strlen(al->line);
if (notes->max_line_len < line_len)
notes->max_line_len = line_len;
al->idx = notes->nr_entries++;
if (al->offset != -1) {
al->idx_asm = notes->nr_asm_entries++;
/*
* FIXME: short term bandaid to cope with assembly
* routines that comes with labels in the same column
* as the address in objdump, sigh.
*
* E.g. copy_user_generic_unrolled
*/
if (al->offset < size)
notes->offsets[al->offset] = al;
} else
al->idx_asm = -1;
}
}
static inline int width_jumps(int n)
{
if (n >= 100)
return 5;
if (n / 10)
return 2;
return 1;
}
static int annotation__max_ins_name(struct annotation *notes)
{
int max_name = 0, len;
struct annotation_line *al;
list_for_each_entry(al, &notes->src->source, node) {
if (al->offset == -1)
continue;
len = strlen(disasm_line(al)->ins.name);
if (max_name < len)
max_name = len;
}
return max_name;
}
void annotation__init_column_widths(struct annotation *notes, struct symbol *sym)
{
notes->widths.addr = notes->widths.target =
notes->widths.min_addr = hex_width(symbol__size(sym));
notes->widths.max_addr = hex_width(sym->end);
notes->widths.jumps = width_jumps(notes->max_jump_sources);
notes->widths.max_ins_name = annotation__max_ins_name(notes);
}
void annotation__update_column_widths(struct annotation *notes)
{
if (notes->options->use_offset)
notes->widths.target = notes->widths.min_addr;
else
notes->widths.target = notes->widths.max_addr;
notes->widths.addr = notes->widths.target;
if (notes->options->show_nr_jumps)
notes->widths.addr += notes->widths.jumps + 1;
}
static void annotation__calc_lines(struct annotation *notes, struct map *map,
struct rb_root *root,
struct annotation_options *opts)
{
struct annotation_line *al;
struct rb_root tmp_root = RB_ROOT;
list_for_each_entry(al, &notes->src->source, node) {
double percent_max = 0.0;
int i;
for (i = 0; i < al->data_nr; i++) {
double percent;
percent = annotation_data__percent(&al->data[i],
opts->percent_type);
if (percent > percent_max)
percent_max = percent;
}
if (percent_max <= 0.5)
continue;
al->path = get_srcline(map->dso, notes->start + al->offset, NULL,
false, true, notes->start + al->offset);
insert_source_line(&tmp_root, al, opts);
}
resort_source_line(root, &tmp_root);
}
static void symbol__calc_lines(struct map_symbol *ms, struct rb_root *root,
struct annotation_options *opts)
{
struct annotation *notes = symbol__annotation(ms->sym);
annotation__calc_lines(notes, ms->map, root, opts);
}
int symbol__tty_annotate2(struct map_symbol *ms, struct evsel *evsel,
struct annotation_options *opts)
{
struct dso *dso = ms->map->dso;
struct symbol *sym = ms->sym;
struct rb_root source_line = RB_ROOT;
struct hists *hists = evsel__hists(evsel);
char buf[1024];
if (symbol__annotate2(ms, evsel, opts, NULL) < 0)
return -1;
if (opts->print_lines) {
srcline_full_filename = opts->full_path;
symbol__calc_lines(ms, &source_line, opts);
print_summary(&source_line, dso->long_name);
}
hists__scnprintf_title(hists, buf, sizeof(buf));
fprintf(stdout, "%s, [percent: %s]\n%s() %s\n",
buf, percent_type_str(opts->percent_type), sym->name, dso->long_name);
symbol__annotate_fprintf2(sym, stdout, opts);
annotated_source__purge(symbol__annotation(sym)->src);
return 0;
}
int symbol__tty_annotate(struct map_symbol *ms, struct evsel *evsel,
struct annotation_options *opts)
{
struct dso *dso = ms->map->dso;
struct symbol *sym = ms->sym;
struct rb_root source_line = RB_ROOT;
if (symbol__annotate(ms, evsel, opts, NULL) < 0)
return -1;
symbol__calc_percent(sym, evsel);
if (opts->print_lines) {
srcline_full_filename = opts->full_path;
symbol__calc_lines(ms, &source_line, opts);
print_summary(&source_line, dso->long_name);
}
symbol__annotate_printf(ms, evsel, opts);
annotated_source__purge(symbol__annotation(sym)->src);
return 0;
}
bool ui__has_annotation(void)
{
return use_browser == 1 && perf_hpp_list.sym;
}
static double annotation_line__max_percent(struct annotation_line *al,
struct annotation *notes,
unsigned int percent_type)
{
double percent_max = 0.0;
int i;
for (i = 0; i < notes->nr_events; i++) {
double percent;
percent = annotation_data__percent(&al->data[i],
percent_type);
if (percent > percent_max)
percent_max = percent;
}
return percent_max;
}
static void disasm_line__write(struct disasm_line *dl, struct annotation *notes,
void *obj, char *bf, size_t size,
void (*obj__printf)(void *obj, const char *fmt, ...),
void (*obj__write_graph)(void *obj, int graph))
{
if (dl->ins.ops && dl->ins.ops->scnprintf) {
if (ins__is_jump(&dl->ins)) {
bool fwd;
if (dl->ops.target.outside)
goto call_like;
fwd = dl->ops.target.offset > dl->al.offset;
obj__write_graph(obj, fwd ? DARROW_CHAR : UARROW_CHAR);
obj__printf(obj, " ");
} else if (ins__is_call(&dl->ins)) {
call_like:
obj__write_graph(obj, RARROW_CHAR);
obj__printf(obj, " ");
} else if (ins__is_ret(&dl->ins)) {
obj__write_graph(obj, LARROW_CHAR);
obj__printf(obj, " ");
} else {
obj__printf(obj, " ");
}
} else {
obj__printf(obj, " ");
}
disasm_line__scnprintf(dl, bf, size, !notes->options->use_offset, notes->widths.max_ins_name);
}
static void ipc_coverage_string(char *bf, int size, struct annotation *notes)
{
double ipc = 0.0, coverage = 0.0;
if (notes->hit_cycles)
ipc = notes->hit_insn / ((double)notes->hit_cycles);
if (notes->total_insn) {
coverage = notes->cover_insn * 100.0 /
((double)notes->total_insn);
}
scnprintf(bf, size, "(Average IPC: %.2f, IPC Coverage: %.1f%%)",
ipc, coverage);
}
static void __annotation_line__write(struct annotation_line *al, struct annotation *notes,
bool first_line, bool current_entry, bool change_color, int width,
void *obj, unsigned int percent_type,
int (*obj__set_color)(void *obj, int color),
void (*obj__set_percent_color)(void *obj, double percent, bool current),
int (*obj__set_jumps_percent_color)(void *obj, int nr, bool current),
void (*obj__printf)(void *obj, const char *fmt, ...),
void (*obj__write_graph)(void *obj, int graph))
{
double percent_max = annotation_line__max_percent(al, notes, percent_type);
int pcnt_width = annotation__pcnt_width(notes),
cycles_width = annotation__cycles_width(notes);
bool show_title = false;
char bf[256];
int printed;
if (first_line && (al->offset == -1 || percent_max == 0.0)) {
if (notes->have_cycles) {
if (al->ipc == 0.0 && al->cycles == 0)
show_title = true;
} else
show_title = true;
}
if (al->offset != -1 && percent_max != 0.0) {
int i;
for (i = 0; i < notes->nr_events; i++) {
double percent;
percent = annotation_data__percent(&al->data[i], percent_type);
obj__set_percent_color(obj, percent, current_entry);
if (symbol_conf.show_total_period) {
obj__printf(obj, "%11" PRIu64 " ", al->data[i].he.period);
} else if (symbol_conf.show_nr_samples) {
obj__printf(obj, "%6" PRIu64 " ",
al->data[i].he.nr_samples);
} else {
obj__printf(obj, "%6.2f ", percent);
}
}
} else {
obj__set_percent_color(obj, 0, current_entry);
if (!show_title)
obj__printf(obj, "%-*s", pcnt_width, " ");
else {
obj__printf(obj, "%-*s", pcnt_width,
symbol_conf.show_total_period ? "Period" :
symbol_conf.show_nr_samples ? "Samples" : "Percent");
}
}
if (notes->have_cycles) {
if (al->ipc)
obj__printf(obj, "%*.2f ", ANNOTATION__IPC_WIDTH - 1, al->ipc);
else if (!show_title)
obj__printf(obj, "%*s", ANNOTATION__IPC_WIDTH, " ");
else
obj__printf(obj, "%*s ", ANNOTATION__IPC_WIDTH - 1, "IPC");
if (!notes->options->show_minmax_cycle) {
if (al->cycles)
obj__printf(obj, "%*" PRIu64 " ",
ANNOTATION__CYCLES_WIDTH - 1, al->cycles);
else if (!show_title)
obj__printf(obj, "%*s",
ANNOTATION__CYCLES_WIDTH, " ");
else
obj__printf(obj, "%*s ",
ANNOTATION__CYCLES_WIDTH - 1,
"Cycle");
} else {
if (al->cycles) {
char str[32];
scnprintf(str, sizeof(str),
"%" PRIu64 "(%" PRIu64 "/%" PRIu64 ")",
al->cycles, al->cycles_min,
al->cycles_max);
obj__printf(obj, "%*s ",
ANNOTATION__MINMAX_CYCLES_WIDTH - 1,
str);
} else if (!show_title)
obj__printf(obj, "%*s",
ANNOTATION__MINMAX_CYCLES_WIDTH,
" ");
else
obj__printf(obj, "%*s ",
ANNOTATION__MINMAX_CYCLES_WIDTH - 1,
"Cycle(min/max)");
}
if (show_title && !*al->line) {
ipc_coverage_string(bf, sizeof(bf), notes);
obj__printf(obj, "%*s", ANNOTATION__AVG_IPC_WIDTH, bf);
}
}
obj__printf(obj, " ");
if (!*al->line)
obj__printf(obj, "%-*s", width - pcnt_width - cycles_width, " ");
else if (al->offset == -1) {
if (al->line_nr && notes->options->show_linenr)
printed = scnprintf(bf, sizeof(bf), "%-*d ", notes->widths.addr + 1, al->line_nr);
else
printed = scnprintf(bf, sizeof(bf), "%-*s ", notes->widths.addr, " ");
obj__printf(obj, bf);
obj__printf(obj, "%-*s", width - printed - pcnt_width - cycles_width + 1, al->line);
} else {
u64 addr = al->offset;
int color = -1;
if (!notes->options->use_offset)
addr += notes->start;
if (!notes->options->use_offset) {
printed = scnprintf(bf, sizeof(bf), "%" PRIx64 ": ", addr);
} else {
if (al->jump_sources &&
notes->options->offset_level >= ANNOTATION__OFFSET_JUMP_TARGETS) {
if (notes->options->show_nr_jumps) {
int prev;
printed = scnprintf(bf, sizeof(bf), "%*d ",
notes->widths.jumps,
al->jump_sources);
prev = obj__set_jumps_percent_color(obj, al->jump_sources,
current_entry);
obj__printf(obj, bf);
obj__set_color(obj, prev);
}
print_addr:
printed = scnprintf(bf, sizeof(bf), "%*" PRIx64 ": ",
notes->widths.target, addr);
} else if (ins__is_call(&disasm_line(al)->ins) &&
notes->options->offset_level >= ANNOTATION__OFFSET_CALL) {
goto print_addr;
} else if (notes->options->offset_level == ANNOTATION__MAX_OFFSET_LEVEL) {
goto print_addr;
} else {
printed = scnprintf(bf, sizeof(bf), "%-*s ",
notes->widths.addr, " ");
}
}
if (change_color)
color = obj__set_color(obj, HE_COLORSET_ADDR);
obj__printf(obj, bf);
if (change_color)
obj__set_color(obj, color);
disasm_line__write(disasm_line(al), notes, obj, bf, sizeof(bf), obj__printf, obj__write_graph);
obj__printf(obj, "%-*s", width - pcnt_width - cycles_width - 3 - printed, bf);
}
}
void annotation_line__write(struct annotation_line *al, struct annotation *notes,
struct annotation_write_ops *wops,
struct annotation_options *opts)
{
__annotation_line__write(al, notes, wops->first_line, wops->current_entry,
wops->change_color, wops->width, wops->obj,
opts->percent_type,
wops->set_color, wops->set_percent_color,
wops->set_jumps_percent_color, wops->printf,
wops->write_graph);
}
int symbol__annotate2(struct map_symbol *ms, struct evsel *evsel,
struct annotation_options *options, struct arch **parch)
{
struct symbol *sym = ms->sym;
struct annotation *notes = symbol__annotation(sym);
size_t size = symbol__size(sym);
int nr_pcnt = 1, err;
notes->offsets = zalloc(size * sizeof(struct annotation_line *));
if (notes->offsets == NULL)
return ENOMEM;
if (evsel__is_group_event(evsel))
nr_pcnt = evsel->core.nr_members;
err = symbol__annotate(ms, evsel, options, parch);
if (err)
goto out_free_offsets;
notes->options = options;
symbol__calc_percent(sym, evsel);
annotation__set_offsets(notes, size);
annotation__mark_jump_targets(notes, sym);
annotation__compute_ipc(notes, size);
annotation__init_column_widths(notes, sym);
notes->nr_events = nr_pcnt;
annotation__update_column_widths(notes);
sym->annotate2 = true;
return 0;
out_free_offsets:
zfree(&notes->offsets);
return err;
}
static int annotation__config(const char *var, const char *value, void *data)
{
struct annotation_options *opt = data;
if (!strstarts(var, "annotate."))
return 0;
if (!strcmp(var, "annotate.offset_level")) {
perf_config_u8(&opt->offset_level, "offset_level", value);
if (opt->offset_level > ANNOTATION__MAX_OFFSET_LEVEL)
opt->offset_level = ANNOTATION__MAX_OFFSET_LEVEL;
else if (opt->offset_level < ANNOTATION__MIN_OFFSET_LEVEL)
opt->offset_level = ANNOTATION__MIN_OFFSET_LEVEL;
} else if (!strcmp(var, "annotate.hide_src_code")) {
opt->hide_src_code = perf_config_bool("hide_src_code", value);
} else if (!strcmp(var, "annotate.jump_arrows")) {
opt->jump_arrows = perf_config_bool("jump_arrows", value);
} else if (!strcmp(var, "annotate.show_linenr")) {
opt->show_linenr = perf_config_bool("show_linenr", value);
} else if (!strcmp(var, "annotate.show_nr_jumps")) {
opt->show_nr_jumps = perf_config_bool("show_nr_jumps", value);
} else if (!strcmp(var, "annotate.show_nr_samples")) {
symbol_conf.show_nr_samples = perf_config_bool("show_nr_samples",
value);
} else if (!strcmp(var, "annotate.show_total_period")) {
symbol_conf.show_total_period = perf_config_bool("show_total_period",
value);
} else if (!strcmp(var, "annotate.use_offset")) {
opt->use_offset = perf_config_bool("use_offset", value);
} else {
pr_debug("%s variable unknown, ignoring...", var);
}
return 0;
}
void annotation_config__init(struct annotation_options *opt)
{
perf_config(annotation__config, opt);
}
static unsigned int parse_percent_type(char *str1, char *str2)
{
unsigned int type = (unsigned int) -1;
if (!strcmp("period", str1)) {
if (!strcmp("local", str2))
type = PERCENT_PERIOD_LOCAL;
else if (!strcmp("global", str2))
type = PERCENT_PERIOD_GLOBAL;
}
if (!strcmp("hits", str1)) {
if (!strcmp("local", str2))
type = PERCENT_HITS_LOCAL;
else if (!strcmp("global", str2))
type = PERCENT_HITS_GLOBAL;
}
return type;
}
int annotate_parse_percent_type(const struct option *opt, const char *_str,
int unset __maybe_unused)
{
struct annotation_options *opts = opt->value;
unsigned int type;
char *str1, *str2;
int err = -1;
str1 = strdup(_str);
if (!str1)
return -ENOMEM;
str2 = strchr(str1, '-');
if (!str2)
goto out;
*str2++ = 0;
type = parse_percent_type(str1, str2);
if (type == (unsigned int) -1)
type = parse_percent_type(str2, str1);
if (type != (unsigned int) -1) {
opts->percent_type = type;
err = 0;
}
out:
free(str1);
return err;
}
int annotate_check_args(struct annotation_options *args)
{
if (args->prefix_strip && !args->prefix) {
pr_err("--prefix-strip requires --prefix\n");
return -1;
}
return 0;
}
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