![Masami Hiramatsu](/assets/img/avatar_default.png)
Support accessing members in the data structures. With this, perf-probe accepts data-structure members(IOW, it now accepts dot '.' and arrow '->' operators) as probe arguemnts. e.g. ./perf probe --add 'schedule:44 rq->curr' ./perf probe --add 'vfs_read file->f_op->read file->f_path.dentry' Note that '>' can be interpreted as redirection in command-line. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: systemtap <systemtap@sources.redhat.com> Cc: DLE <dle-develop@lists.sourceforge.net> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <20100316220626.32050.57552.stgit@localhost6.localdomain6> Signed-off-by: Ingo Molnar <mingo@elte.hu>
1011 lines
24 KiB
C
1011 lines
24 KiB
C
/*
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* probe-finder.c : C expression to kprobe event converter
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*
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* Written by Masami Hiramatsu <mhiramat@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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#include <sys/utsname.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <getopt.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdarg.h>
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#include <ctype.h>
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#include "string.h"
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#include "event.h"
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#include "debug.h"
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#include "util.h"
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#include "probe-finder.h"
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/*
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* Generic dwarf analysis helpers
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*/
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#define X86_32_MAX_REGS 8
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const char *x86_32_regs_table[X86_32_MAX_REGS] = {
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"%ax",
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"%cx",
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"%dx",
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"%bx",
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"$stack", /* Stack address instead of %sp */
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"%bp",
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"%si",
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"%di",
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};
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#define X86_64_MAX_REGS 16
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const char *x86_64_regs_table[X86_64_MAX_REGS] = {
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"%ax",
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"%dx",
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"%cx",
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"%bx",
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"%si",
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"%di",
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"%bp",
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"%sp",
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"%r8",
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"%r9",
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"%r10",
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"%r11",
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"%r12",
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"%r13",
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"%r14",
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"%r15",
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};
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/* TODO: switching by dwarf address size */
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#ifdef __x86_64__
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#define ARCH_MAX_REGS X86_64_MAX_REGS
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#define arch_regs_table x86_64_regs_table
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#else
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#define ARCH_MAX_REGS X86_32_MAX_REGS
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#define arch_regs_table x86_32_regs_table
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#endif
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/* Return architecture dependent register string (for kprobe-tracer) */
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static const char *get_arch_regstr(unsigned int n)
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{
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return (n <= ARCH_MAX_REGS) ? arch_regs_table[n] : NULL;
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}
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/*
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* Compare the tail of two strings.
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* Return 0 if whole of either string is same as another's tail part.
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*/
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static int strtailcmp(const char *s1, const char *s2)
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{
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int i1 = strlen(s1);
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int i2 = strlen(s2);
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while (--i1 >= 0 && --i2 >= 0) {
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if (s1[i1] != s2[i2])
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return s1[i1] - s2[i2];
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}
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return 0;
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}
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/* Line number list operations */
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/* Add a line to line number list */
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static void line_list__add_line(struct list_head *head, unsigned int line)
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{
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struct line_node *ln;
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struct list_head *p;
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/* Reverse search, because new line will be the last one */
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list_for_each_entry_reverse(ln, head, list) {
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if (ln->line < line) {
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p = &ln->list;
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goto found;
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} else if (ln->line == line) /* Already exist */
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return ;
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}
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/* List is empty, or the smallest entry */
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p = head;
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found:
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pr_debug("line list: add a line %u\n", line);
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ln = xzalloc(sizeof(struct line_node));
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ln->line = line;
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INIT_LIST_HEAD(&ln->list);
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list_add(&ln->list, p);
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}
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/* Check if the line in line number list */
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static int line_list__has_line(struct list_head *head, unsigned int line)
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{
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struct line_node *ln;
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/* Reverse search, because new line will be the last one */
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list_for_each_entry(ln, head, list)
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if (ln->line == line)
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return 1;
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return 0;
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}
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/* Init line number list */
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static void line_list__init(struct list_head *head)
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{
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INIT_LIST_HEAD(head);
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}
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/* Free line number list */
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static void line_list__free(struct list_head *head)
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{
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struct line_node *ln;
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while (!list_empty(head)) {
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ln = list_first_entry(head, struct line_node, list);
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list_del(&ln->list);
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free(ln);
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}
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}
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/* Dwarf wrappers */
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/* Find the realpath of the target file. */
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static const char *cu_find_realpath(Dwarf_Die *cu_die, const char *fname)
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{
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Dwarf_Files *files;
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size_t nfiles, i;
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const char *src = NULL;
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int ret;
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if (!fname)
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return NULL;
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ret = dwarf_getsrcfiles(cu_die, &files, &nfiles);
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if (ret != 0)
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return NULL;
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for (i = 0; i < nfiles; i++) {
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src = dwarf_filesrc(files, i, NULL, NULL);
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if (strtailcmp(src, fname) == 0)
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break;
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}
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return src;
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}
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/* Compare diename and tname */
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static bool die_compare_name(Dwarf_Die *dw_die, const char *tname)
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{
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const char *name;
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name = dwarf_diename(dw_die);
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DIE_IF(name == NULL);
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return strcmp(tname, name);
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}
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/* Get entry pc(or low pc, 1st entry of ranges) of the die */
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static Dwarf_Addr die_get_entrypc(Dwarf_Die *dw_die)
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{
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Dwarf_Addr epc;
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int ret;
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ret = dwarf_entrypc(dw_die, &epc);
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DIE_IF(ret == -1);
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return epc;
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}
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/* Get type die, but skip qualifiers and typedef */
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static Dwarf_Die *die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem)
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{
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Dwarf_Attribute attr;
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int tag;
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do {
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if (dwarf_attr(vr_die, DW_AT_type, &attr) == NULL ||
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dwarf_formref_die(&attr, die_mem) == NULL)
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return NULL;
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tag = dwarf_tag(die_mem);
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vr_die = die_mem;
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} while (tag == DW_TAG_const_type ||
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tag == DW_TAG_restrict_type ||
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tag == DW_TAG_volatile_type ||
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tag == DW_TAG_shared_type ||
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tag == DW_TAG_typedef);
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return die_mem;
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}
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/* Return values for die_find callbacks */
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enum {
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DIE_FIND_CB_FOUND = 0, /* End of Search */
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DIE_FIND_CB_CHILD = 1, /* Search only children */
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DIE_FIND_CB_SIBLING = 2, /* Search only siblings */
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DIE_FIND_CB_CONTINUE = 3, /* Search children and siblings */
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};
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/* Search a child die */
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static Dwarf_Die *die_find_child(Dwarf_Die *rt_die,
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int (*callback)(Dwarf_Die *, void *),
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void *data, Dwarf_Die *die_mem)
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{
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Dwarf_Die child_die;
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int ret;
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ret = dwarf_child(rt_die, die_mem);
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if (ret != 0)
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return NULL;
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do {
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ret = callback(die_mem, data);
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if (ret == DIE_FIND_CB_FOUND)
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return die_mem;
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if ((ret & DIE_FIND_CB_CHILD) &&
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die_find_child(die_mem, callback, data, &child_die)) {
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memcpy(die_mem, &child_die, sizeof(Dwarf_Die));
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return die_mem;
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}
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} while ((ret & DIE_FIND_CB_SIBLING) &&
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dwarf_siblingof(die_mem, die_mem) == 0);
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return NULL;
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}
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struct __addr_die_search_param {
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Dwarf_Addr addr;
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Dwarf_Die *die_mem;
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};
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static int __die_search_func_cb(Dwarf_Die *fn_die, void *data)
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{
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struct __addr_die_search_param *ad = data;
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if (dwarf_tag(fn_die) == DW_TAG_subprogram &&
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dwarf_haspc(fn_die, ad->addr)) {
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memcpy(ad->die_mem, fn_die, sizeof(Dwarf_Die));
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return DWARF_CB_ABORT;
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}
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return DWARF_CB_OK;
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}
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/* Search a real subprogram including this line, */
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static Dwarf_Die *die_find_real_subprogram(Dwarf_Die *cu_die, Dwarf_Addr addr,
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Dwarf_Die *die_mem)
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{
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struct __addr_die_search_param ad;
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ad.addr = addr;
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ad.die_mem = die_mem;
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/* dwarf_getscopes can't find subprogram. */
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if (!dwarf_getfuncs(cu_die, __die_search_func_cb, &ad, 0))
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return NULL;
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else
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return die_mem;
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}
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/* die_find callback for inline function search */
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static int __die_find_inline_cb(Dwarf_Die *die_mem, void *data)
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{
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Dwarf_Addr *addr = data;
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if (dwarf_tag(die_mem) == DW_TAG_inlined_subroutine &&
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dwarf_haspc(die_mem, *addr))
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return DIE_FIND_CB_FOUND;
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return DIE_FIND_CB_CONTINUE;
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}
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/* Similar to dwarf_getfuncs, but returns inlined_subroutine if exists. */
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static Dwarf_Die *die_find_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr,
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Dwarf_Die *die_mem)
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{
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return die_find_child(sp_die, __die_find_inline_cb, &addr, die_mem);
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}
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static int __die_find_variable_cb(Dwarf_Die *die_mem, void *data)
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{
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const char *name = data;
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int tag;
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tag = dwarf_tag(die_mem);
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if ((tag == DW_TAG_formal_parameter ||
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tag == DW_TAG_variable) &&
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(die_compare_name(die_mem, name) == 0))
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return DIE_FIND_CB_FOUND;
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return DIE_FIND_CB_CONTINUE;
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}
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/* Find a variable called 'name' */
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static Dwarf_Die *die_find_variable(Dwarf_Die *sp_die, const char *name,
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Dwarf_Die *die_mem)
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{
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return die_find_child(sp_die, __die_find_variable_cb, (void *)name,
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die_mem);
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}
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static int __die_find_member_cb(Dwarf_Die *die_mem, void *data)
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{
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const char *name = data;
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if ((dwarf_tag(die_mem) == DW_TAG_member) &&
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(die_compare_name(die_mem, name) == 0))
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return DIE_FIND_CB_FOUND;
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return DIE_FIND_CB_SIBLING;
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}
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/* Find a member called 'name' */
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static Dwarf_Die *die_find_member(Dwarf_Die *st_die, const char *name,
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Dwarf_Die *die_mem)
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{
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return die_find_child(st_die, __die_find_member_cb, (void *)name,
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die_mem);
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}
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/*
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* Probe finder related functions
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*/
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/* Show a location */
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static void convert_location(Dwarf_Op *op, struct probe_finder *pf)
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{
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unsigned int regn;
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Dwarf_Word offs = 0;
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bool ref = false;
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const char *regs;
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struct kprobe_trace_arg *tvar = pf->tvar;
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/* TODO: support CFA */
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/* If this is based on frame buffer, set the offset */
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if (op->atom == DW_OP_fbreg) {
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if (pf->fb_ops == NULL)
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die("The attribute of frame base is not supported.\n");
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ref = true;
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offs = op->number;
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op = &pf->fb_ops[0];
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}
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if (op->atom >= DW_OP_breg0 && op->atom <= DW_OP_breg31) {
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regn = op->atom - DW_OP_breg0;
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offs += op->number;
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ref = true;
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} else if (op->atom >= DW_OP_reg0 && op->atom <= DW_OP_reg31) {
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regn = op->atom - DW_OP_reg0;
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} else if (op->atom == DW_OP_bregx) {
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regn = op->number;
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offs += op->number2;
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ref = true;
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} else if (op->atom == DW_OP_regx) {
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regn = op->number;
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} else
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die("DW_OP %d is not supported.", op->atom);
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regs = get_arch_regstr(regn);
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if (!regs)
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die("%u exceeds max register number.", regn);
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tvar->value = xstrdup(regs);
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if (ref) {
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tvar->ref = xzalloc(sizeof(struct kprobe_trace_arg_ref));
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tvar->ref->offset = (long)offs;
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}
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}
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static void convert_variable_fields(Dwarf_Die *vr_die, const char *varname,
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struct perf_probe_arg_field *field,
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struct kprobe_trace_arg_ref **ref_ptr)
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{
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struct kprobe_trace_arg_ref *ref = *ref_ptr;
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Dwarf_Attribute attr;
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Dwarf_Die member;
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Dwarf_Die type;
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Dwarf_Word offs;
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pr_debug("converting %s in %s\n", field->name, varname);
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if (die_get_real_type(vr_die, &type) == NULL)
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die("Failed to get a type information of %s.", varname);
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/* Check the pointer and dereference */
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if (dwarf_tag(&type) == DW_TAG_pointer_type) {
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if (!field->ref)
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die("Semantic error: %s must be referred by '->'",
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field->name);
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/* Get the type pointed by this pointer */
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if (die_get_real_type(&type, &type) == NULL)
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die("Failed to get a type information of %s.", varname);
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ref = xzalloc(sizeof(struct kprobe_trace_arg_ref));
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if (*ref_ptr)
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(*ref_ptr)->next = ref;
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else
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*ref_ptr = ref;
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} else {
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if (field->ref)
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die("Semantic error: %s must be referred by '.'",
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field->name);
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if (!ref)
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die("Structure on a register is not supported yet.");
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}
|
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|
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/* Verify it is a data structure */
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if (dwarf_tag(&type) != DW_TAG_structure_type)
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die("%s is not a data structure.", varname);
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if (die_find_member(&type, field->name, &member) == NULL)
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die("%s(tyep:%s) has no member %s.", varname,
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dwarf_diename(&type), field->name);
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|
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/* Get the offset of the field */
|
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if (dwarf_attr(&member, DW_AT_data_member_location, &attr) == NULL ||
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dwarf_formudata(&attr, &offs) != 0)
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die("Failed to get the offset of %s.", field->name);
|
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ref->offset += (long)offs;
|
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|
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/* Converting next field */
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if (field->next)
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convert_variable_fields(&member, field->name, field->next,
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&ref);
|
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}
|
|
|
|
/* Show a variables in kprobe event format */
|
|
static void convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf)
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{
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Dwarf_Attribute attr;
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Dwarf_Op *expr;
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size_t nexpr;
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int ret;
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|
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if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL)
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goto error;
|
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/* TODO: handle more than 1 exprs */
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ret = dwarf_getlocation_addr(&attr, pf->addr, &expr, &nexpr, 1);
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if (ret <= 0 || nexpr == 0)
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goto error;
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|
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convert_location(expr, pf);
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|
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if (pf->pvar->field)
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convert_variable_fields(vr_die, pf->pvar->name,
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pf->pvar->field, &pf->tvar->ref);
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/* *expr will be cached in libdw. Don't free it. */
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return ;
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error:
|
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/* TODO: Support const_value */
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die("Failed to find the location of %s at this address.\n"
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" Perhaps, it has been optimized out.", pf->pvar->name);
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}
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|
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/* Find a variable in a subprogram die */
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static void find_variable(Dwarf_Die *sp_die, struct probe_finder *pf)
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{
|
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Dwarf_Die vr_die;
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char buf[128];
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|
|
|
/* TODO: Support struct members and arrays */
|
|
if (!is_c_varname(pf->pvar->name)) {
|
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/* Copy raw parameters */
|
|
pf->tvar->value = xstrdup(pf->pvar->name);
|
|
} else {
|
|
synthesize_perf_probe_arg(pf->pvar, buf, 128);
|
|
pf->tvar->name = xstrdup(buf);
|
|
pr_debug("Searching '%s' variable in context.\n",
|
|
pf->pvar->name);
|
|
/* Search child die for local variables and parameters. */
|
|
if (!die_find_variable(sp_die, pf->pvar->name, &vr_die))
|
|
die("Failed to find '%s' in this function.",
|
|
pf->pvar->name);
|
|
convert_variable(&vr_die, pf);
|
|
}
|
|
}
|
|
|
|
/* Show a probe point to output buffer */
|
|
static void convert_probe_point(Dwarf_Die *sp_die, struct probe_finder *pf)
|
|
{
|
|
struct kprobe_trace_event *tev;
|
|
Dwarf_Addr eaddr;
|
|
Dwarf_Die die_mem;
|
|
const char *name;
|
|
int ret, i;
|
|
Dwarf_Attribute fb_attr;
|
|
size_t nops;
|
|
|
|
if (pf->ntevs == MAX_PROBES)
|
|
die("Too many( > %d) probe point found.\n", MAX_PROBES);
|
|
tev = &pf->tevs[pf->ntevs++];
|
|
|
|
/* If no real subprogram, find a real one */
|
|
if (!sp_die || dwarf_tag(sp_die) != DW_TAG_subprogram) {
|
|
sp_die = die_find_real_subprogram(&pf->cu_die,
|
|
pf->addr, &die_mem);
|
|
if (!sp_die)
|
|
die("Probe point is not found in subprograms.");
|
|
}
|
|
|
|
/* Copy the name of probe point */
|
|
name = dwarf_diename(sp_die);
|
|
if (name) {
|
|
dwarf_entrypc(sp_die, &eaddr);
|
|
tev->point.symbol = xstrdup(name);
|
|
tev->point.offset = (unsigned long)(pf->addr - eaddr);
|
|
} else
|
|
/* This function has no name. */
|
|
tev->point.offset = (unsigned long)pf->addr;
|
|
|
|
pr_debug("Probe point found: %s+%lu\n", tev->point.symbol,
|
|
tev->point.offset);
|
|
|
|
/* Get the frame base attribute/ops */
|
|
dwarf_attr(sp_die, DW_AT_frame_base, &fb_attr);
|
|
ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1);
|
|
if (ret <= 0 || nops == 0)
|
|
pf->fb_ops = NULL;
|
|
|
|
/* Find each argument */
|
|
/* TODO: use dwarf_cfi_addrframe */
|
|
tev->nargs = pf->pev->nargs;
|
|
tev->args = xzalloc(sizeof(struct kprobe_trace_arg) * tev->nargs);
|
|
for (i = 0; i < pf->pev->nargs; i++) {
|
|
pf->pvar = &pf->pev->args[i];
|
|
pf->tvar = &tev->args[i];
|
|
find_variable(sp_die, pf);
|
|
}
|
|
|
|
/* *pf->fb_ops will be cached in libdw. Don't free it. */
|
|
pf->fb_ops = NULL;
|
|
}
|
|
|
|
/* Find probe point from its line number */
|
|
static void find_probe_point_by_line(struct probe_finder *pf)
|
|
{
|
|
Dwarf_Lines *lines;
|
|
Dwarf_Line *line;
|
|
size_t nlines, i;
|
|
Dwarf_Addr addr;
|
|
int lineno;
|
|
int ret;
|
|
|
|
ret = dwarf_getsrclines(&pf->cu_die, &lines, &nlines);
|
|
DIE_IF(ret != 0);
|
|
|
|
for (i = 0; i < nlines; i++) {
|
|
line = dwarf_onesrcline(lines, i);
|
|
dwarf_lineno(line, &lineno);
|
|
if (lineno != pf->lno)
|
|
continue;
|
|
|
|
/* TODO: Get fileno from line, but how? */
|
|
if (strtailcmp(dwarf_linesrc(line, NULL, NULL), pf->fname) != 0)
|
|
continue;
|
|
|
|
ret = dwarf_lineaddr(line, &addr);
|
|
DIE_IF(ret != 0);
|
|
pr_debug("Probe line found: line[%d]:%d addr:0x%jx\n",
|
|
(int)i, lineno, (uintmax_t)addr);
|
|
pf->addr = addr;
|
|
|
|
convert_probe_point(NULL, pf);
|
|
/* Continuing, because target line might be inlined. */
|
|
}
|
|
}
|
|
|
|
/* Find lines which match lazy pattern */
|
|
static int find_lazy_match_lines(struct list_head *head,
|
|
const char *fname, const char *pat)
|
|
{
|
|
char *fbuf, *p1, *p2;
|
|
int fd, line, nlines = 0;
|
|
struct stat st;
|
|
|
|
fd = open(fname, O_RDONLY);
|
|
if (fd < 0)
|
|
die("failed to open %s", fname);
|
|
DIE_IF(fstat(fd, &st) < 0);
|
|
fbuf = xmalloc(st.st_size + 2);
|
|
DIE_IF(read(fd, fbuf, st.st_size) < 0);
|
|
close(fd);
|
|
fbuf[st.st_size] = '\n'; /* Dummy line */
|
|
fbuf[st.st_size + 1] = '\0';
|
|
p1 = fbuf;
|
|
line = 1;
|
|
while ((p2 = strchr(p1, '\n')) != NULL) {
|
|
*p2 = '\0';
|
|
if (strlazymatch(p1, pat)) {
|
|
line_list__add_line(head, line);
|
|
nlines++;
|
|
}
|
|
line++;
|
|
p1 = p2 + 1;
|
|
}
|
|
free(fbuf);
|
|
return nlines;
|
|
}
|
|
|
|
/* Find probe points from lazy pattern */
|
|
static void find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf)
|
|
{
|
|
Dwarf_Lines *lines;
|
|
Dwarf_Line *line;
|
|
size_t nlines, i;
|
|
Dwarf_Addr addr;
|
|
Dwarf_Die die_mem;
|
|
int lineno;
|
|
int ret;
|
|
|
|
if (list_empty(&pf->lcache)) {
|
|
/* Matching lazy line pattern */
|
|
ret = find_lazy_match_lines(&pf->lcache, pf->fname,
|
|
pf->pev->point.lazy_line);
|
|
if (ret <= 0)
|
|
die("No matched lines found in %s.", pf->fname);
|
|
}
|
|
|
|
ret = dwarf_getsrclines(&pf->cu_die, &lines, &nlines);
|
|
DIE_IF(ret != 0);
|
|
for (i = 0; i < nlines; i++) {
|
|
line = dwarf_onesrcline(lines, i);
|
|
|
|
dwarf_lineno(line, &lineno);
|
|
if (!line_list__has_line(&pf->lcache, lineno))
|
|
continue;
|
|
|
|
/* TODO: Get fileno from line, but how? */
|
|
if (strtailcmp(dwarf_linesrc(line, NULL, NULL), pf->fname) != 0)
|
|
continue;
|
|
|
|
ret = dwarf_lineaddr(line, &addr);
|
|
DIE_IF(ret != 0);
|
|
if (sp_die) {
|
|
/* Address filtering 1: does sp_die include addr? */
|
|
if (!dwarf_haspc(sp_die, addr))
|
|
continue;
|
|
/* Address filtering 2: No child include addr? */
|
|
if (die_find_inlinefunc(sp_die, addr, &die_mem))
|
|
continue;
|
|
}
|
|
|
|
pr_debug("Probe line found: line[%d]:%d addr:0x%llx\n",
|
|
(int)i, lineno, (unsigned long long)addr);
|
|
pf->addr = addr;
|
|
|
|
convert_probe_point(sp_die, pf);
|
|
/* Continuing, because target line might be inlined. */
|
|
}
|
|
/* TODO: deallocate lines, but how? */
|
|
}
|
|
|
|
static int probe_point_inline_cb(Dwarf_Die *in_die, void *data)
|
|
{
|
|
struct probe_finder *pf = (struct probe_finder *)data;
|
|
struct perf_probe_point *pp = &pf->pev->point;
|
|
|
|
if (pp->lazy_line)
|
|
find_probe_point_lazy(in_die, pf);
|
|
else {
|
|
/* Get probe address */
|
|
pf->addr = die_get_entrypc(in_die);
|
|
pf->addr += pp->offset;
|
|
pr_debug("found inline addr: 0x%jx\n",
|
|
(uintmax_t)pf->addr);
|
|
|
|
convert_probe_point(in_die, pf);
|
|
}
|
|
|
|
return DWARF_CB_OK;
|
|
}
|
|
|
|
/* Search function from function name */
|
|
static int probe_point_search_cb(Dwarf_Die *sp_die, void *data)
|
|
{
|
|
struct probe_finder *pf = (struct probe_finder *)data;
|
|
struct perf_probe_point *pp = &pf->pev->point;
|
|
|
|
/* Check tag and diename */
|
|
if (dwarf_tag(sp_die) != DW_TAG_subprogram ||
|
|
die_compare_name(sp_die, pp->function) != 0)
|
|
return 0;
|
|
|
|
pf->fname = dwarf_decl_file(sp_die);
|
|
if (pp->line) { /* Function relative line */
|
|
dwarf_decl_line(sp_die, &pf->lno);
|
|
pf->lno += pp->line;
|
|
find_probe_point_by_line(pf);
|
|
} else if (!dwarf_func_inline(sp_die)) {
|
|
/* Real function */
|
|
if (pp->lazy_line)
|
|
find_probe_point_lazy(sp_die, pf);
|
|
else {
|
|
pf->addr = die_get_entrypc(sp_die);
|
|
pf->addr += pp->offset;
|
|
/* TODO: Check the address in this function */
|
|
convert_probe_point(sp_die, pf);
|
|
}
|
|
} else
|
|
/* Inlined function: search instances */
|
|
dwarf_func_inline_instances(sp_die, probe_point_inline_cb, pf);
|
|
|
|
return 1; /* Exit; no same symbol in this CU. */
|
|
}
|
|
|
|
static void find_probe_point_by_func(struct probe_finder *pf)
|
|
{
|
|
dwarf_getfuncs(&pf->cu_die, probe_point_search_cb, pf, 0);
|
|
}
|
|
|
|
/* Find kprobe_trace_events specified by perf_probe_event from debuginfo */
|
|
int find_kprobe_trace_events(int fd, struct perf_probe_event *pev,
|
|
struct kprobe_trace_event **tevs)
|
|
{
|
|
struct probe_finder pf = {.pev = pev};
|
|
struct perf_probe_point *pp = &pev->point;
|
|
Dwarf_Off off, noff;
|
|
size_t cuhl;
|
|
Dwarf_Die *diep;
|
|
Dwarf *dbg;
|
|
|
|
pf.tevs = xzalloc(sizeof(struct kprobe_trace_event) * MAX_PROBES);
|
|
*tevs = pf.tevs;
|
|
pf.ntevs = 0;
|
|
|
|
dbg = dwarf_begin(fd, DWARF_C_READ);
|
|
if (!dbg)
|
|
return -ENOENT;
|
|
|
|
off = 0;
|
|
line_list__init(&pf.lcache);
|
|
/* Loop on CUs (Compilation Unit) */
|
|
while (!dwarf_nextcu(dbg, off, &noff, &cuhl, NULL, NULL, NULL)) {
|
|
/* Get the DIE(Debugging Information Entry) of this CU */
|
|
diep = dwarf_offdie(dbg, off + cuhl, &pf.cu_die);
|
|
if (!diep)
|
|
continue;
|
|
|
|
/* Check if target file is included. */
|
|
if (pp->file)
|
|
pf.fname = cu_find_realpath(&pf.cu_die, pp->file);
|
|
else
|
|
pf.fname = NULL;
|
|
|
|
if (!pp->file || pf.fname) {
|
|
if (pp->function)
|
|
find_probe_point_by_func(&pf);
|
|
else if (pp->lazy_line)
|
|
find_probe_point_lazy(NULL, &pf);
|
|
else {
|
|
pf.lno = pp->line;
|
|
find_probe_point_by_line(&pf);
|
|
}
|
|
}
|
|
off = noff;
|
|
}
|
|
line_list__free(&pf.lcache);
|
|
dwarf_end(dbg);
|
|
|
|
return pf.ntevs;
|
|
}
|
|
|
|
/* Reverse search */
|
|
int find_perf_probe_point(int fd, unsigned long addr,
|
|
struct perf_probe_point *ppt)
|
|
{
|
|
Dwarf_Die cudie, spdie, indie;
|
|
Dwarf *dbg;
|
|
Dwarf_Line *line;
|
|
Dwarf_Addr laddr, eaddr;
|
|
const char *tmp;
|
|
int lineno, ret = 0;
|
|
|
|
dbg = dwarf_begin(fd, DWARF_C_READ);
|
|
if (!dbg)
|
|
return -ENOENT;
|
|
|
|
/* Find cu die */
|
|
if (!dwarf_addrdie(dbg, (Dwarf_Addr)addr, &cudie))
|
|
return -EINVAL;
|
|
|
|
/* Find a corresponding line */
|
|
line = dwarf_getsrc_die(&cudie, (Dwarf_Addr)addr);
|
|
if (line) {
|
|
dwarf_lineaddr(line, &laddr);
|
|
if ((Dwarf_Addr)addr == laddr) {
|
|
dwarf_lineno(line, &lineno);
|
|
ppt->line = lineno;
|
|
|
|
tmp = dwarf_linesrc(line, NULL, NULL);
|
|
DIE_IF(!tmp);
|
|
ppt->file = xstrdup(tmp);
|
|
ret = 1;
|
|
}
|
|
}
|
|
|
|
/* Find a corresponding function */
|
|
if (die_find_real_subprogram(&cudie, (Dwarf_Addr)addr, &spdie)) {
|
|
tmp = dwarf_diename(&spdie);
|
|
if (!tmp)
|
|
goto end;
|
|
|
|
dwarf_entrypc(&spdie, &eaddr);
|
|
if (!lineno) {
|
|
/* We don't have a line number, let's use offset */
|
|
ppt->function = xstrdup(tmp);
|
|
ppt->offset = addr - (unsigned long)eaddr;
|
|
ret = 1;
|
|
goto end;
|
|
}
|
|
if (die_find_inlinefunc(&spdie, (Dwarf_Addr)addr, &indie)) {
|
|
/* addr in an inline function */
|
|
tmp = dwarf_diename(&indie);
|
|
if (!tmp)
|
|
goto end;
|
|
dwarf_decl_line(&indie, &lineno);
|
|
} else {
|
|
if (eaddr == addr) /* No offset: function entry */
|
|
lineno = ppt->line;
|
|
else
|
|
dwarf_decl_line(&spdie, &lineno);
|
|
}
|
|
ppt->function = xstrdup(tmp);
|
|
ppt->line -= lineno; /* Make a relative line number */
|
|
}
|
|
|
|
end:
|
|
dwarf_end(dbg);
|
|
return ret;
|
|
}
|
|
|
|
|
|
/* Find line range from its line number */
|
|
static void find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf)
|
|
{
|
|
Dwarf_Lines *lines;
|
|
Dwarf_Line *line;
|
|
size_t nlines, i;
|
|
Dwarf_Addr addr;
|
|
int lineno;
|
|
int ret;
|
|
const char *src;
|
|
Dwarf_Die die_mem;
|
|
|
|
line_list__init(&lf->lr->line_list);
|
|
ret = dwarf_getsrclines(&lf->cu_die, &lines, &nlines);
|
|
DIE_IF(ret != 0);
|
|
|
|
for (i = 0; i < nlines; i++) {
|
|
line = dwarf_onesrcline(lines, i);
|
|
ret = dwarf_lineno(line, &lineno);
|
|
DIE_IF(ret != 0);
|
|
if (lf->lno_s > lineno || lf->lno_e < lineno)
|
|
continue;
|
|
|
|
if (sp_die) {
|
|
/* Address filtering 1: does sp_die include addr? */
|
|
ret = dwarf_lineaddr(line, &addr);
|
|
DIE_IF(ret != 0);
|
|
if (!dwarf_haspc(sp_die, addr))
|
|
continue;
|
|
|
|
/* Address filtering 2: No child include addr? */
|
|
if (die_find_inlinefunc(sp_die, addr, &die_mem))
|
|
continue;
|
|
}
|
|
|
|
/* TODO: Get fileno from line, but how? */
|
|
src = dwarf_linesrc(line, NULL, NULL);
|
|
if (strtailcmp(src, lf->fname) != 0)
|
|
continue;
|
|
|
|
/* Copy real path */
|
|
if (!lf->lr->path)
|
|
lf->lr->path = xstrdup(src);
|
|
line_list__add_line(&lf->lr->line_list, (unsigned int)lineno);
|
|
}
|
|
/* Update status */
|
|
if (!list_empty(&lf->lr->line_list))
|
|
lf->found = 1;
|
|
else {
|
|
free(lf->lr->path);
|
|
lf->lr->path = NULL;
|
|
}
|
|
}
|
|
|
|
static int line_range_inline_cb(Dwarf_Die *in_die, void *data)
|
|
{
|
|
find_line_range_by_line(in_die, (struct line_finder *)data);
|
|
return DWARF_CB_ABORT; /* No need to find other instances */
|
|
}
|
|
|
|
/* Search function from function name */
|
|
static int line_range_search_cb(Dwarf_Die *sp_die, void *data)
|
|
{
|
|
struct line_finder *lf = (struct line_finder *)data;
|
|
struct line_range *lr = lf->lr;
|
|
|
|
if (dwarf_tag(sp_die) == DW_TAG_subprogram &&
|
|
die_compare_name(sp_die, lr->function) == 0) {
|
|
lf->fname = dwarf_decl_file(sp_die);
|
|
dwarf_decl_line(sp_die, &lr->offset);
|
|
pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset);
|
|
lf->lno_s = lr->offset + lr->start;
|
|
if (!lr->end)
|
|
lf->lno_e = INT_MAX;
|
|
else
|
|
lf->lno_e = lr->offset + lr->end;
|
|
lr->start = lf->lno_s;
|
|
lr->end = lf->lno_e;
|
|
if (dwarf_func_inline(sp_die))
|
|
dwarf_func_inline_instances(sp_die,
|
|
line_range_inline_cb, lf);
|
|
else
|
|
find_line_range_by_line(sp_die, lf);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void find_line_range_by_func(struct line_finder *lf)
|
|
{
|
|
dwarf_getfuncs(&lf->cu_die, line_range_search_cb, lf, 0);
|
|
}
|
|
|
|
int find_line_range(int fd, struct line_range *lr)
|
|
{
|
|
struct line_finder lf = {.lr = lr, .found = 0};
|
|
int ret;
|
|
Dwarf_Off off = 0, noff;
|
|
size_t cuhl;
|
|
Dwarf_Die *diep;
|
|
Dwarf *dbg;
|
|
|
|
dbg = dwarf_begin(fd, DWARF_C_READ);
|
|
if (!dbg)
|
|
return -ENOENT;
|
|
|
|
/* Loop on CUs (Compilation Unit) */
|
|
while (!lf.found) {
|
|
ret = dwarf_nextcu(dbg, off, &noff, &cuhl, NULL, NULL, NULL);
|
|
if (ret != 0)
|
|
break;
|
|
|
|
/* Get the DIE(Debugging Information Entry) of this CU */
|
|
diep = dwarf_offdie(dbg, off + cuhl, &lf.cu_die);
|
|
if (!diep)
|
|
continue;
|
|
|
|
/* Check if target file is included. */
|
|
if (lr->file)
|
|
lf.fname = cu_find_realpath(&lf.cu_die, lr->file);
|
|
else
|
|
lf.fname = 0;
|
|
|
|
if (!lr->file || lf.fname) {
|
|
if (lr->function)
|
|
find_line_range_by_func(&lf);
|
|
else {
|
|
lf.lno_s = lr->start;
|
|
if (!lr->end)
|
|
lf.lno_e = INT_MAX;
|
|
else
|
|
lf.lno_e = lr->end;
|
|
find_line_range_by_line(NULL, &lf);
|
|
}
|
|
}
|
|
off = noff;
|
|
}
|
|
pr_debug("path: %lx\n", (unsigned long)lr->path);
|
|
dwarf_end(dbg);
|
|
return lf.found;
|
|
}
|
|
|