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ftrace/recordmcount: Add warning logic to warn on mcount not recorded

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There's some sections that should not have mcount recorded and should not have
modifications to the that code. But currently they waste some time by calling
mcount anyway (which simply returns). As the real answer should be to
either whitelist the section or have gcc ignore it fully.

This change adds a option to recordmcount to warn when it finds a section
that is ignored by ftrace but still contains mcount callers. This is not on
by default as developers may not know if the section should be completely
ignored or added to the whitelist.

Cc: John Reiser <jreiser@bitwagon.com>
Link: http://lkml.kernel.org/r/20110421023738.476989377@goodmis.org
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2011-04-12 18:53:25 -04:00 committed by Steven Rostedt
parent ffd618fa39
commit dfad3d598c
2 changed files with 41 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
scripts/recordmcount.c
View File

@ -24,6 +24,7 @@
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <getopt.h>
#include <elf.h>
#include <fcntl.h>
#include <setjmp.h>
@ -39,6 +40,7 @@ static char gpfx; /* prefix for global symbol name (sometimes '_') */
static struct stat sb; /* Remember .st_size, etc. */
static jmp_buf jmpenv; /* setjmp/longjmp per-file error escape */
static const char *altmcount; /* alternate mcount symbol name */
static int warn_on_notrace_sect; /* warn when section has mcount not being recorded */
/* setjmp() return values */
enum {
@ -397,19 +399,33 @@ do_file(char const *const fname)
}
int
main(int argc, char const *argv[])
main(int argc, char *argv[])
{
const char ftrace[] = "/ftrace.o";
int ftrace_size = sizeof(ftrace) - 1;
int n_error = 0; /* gcc-4.3.0 false positive complaint */
int c;
int i;
if (argc <= 1) {
fprintf(stderr, "usage: recordmcount file.o...\n");
while ((c = getopt(argc, argv, "w")) >= 0) {
switch (c) {
case 'w':
warn_on_notrace_sect = 1;
break;
default:
fprintf(stderr, "usage: recordmcount [-w] file.o...\n");
return 0;
}
}
if ((argc - optind) < 1) {
fprintf(stderr, "usage: recordmcount [-w] file.o...\n");
return 0;
}
/* Process each file in turn, allowing deep failure. */
for (--argc, ++argv; argc > 0; --argc, ++argv) {
for (i = optind; i < argc; i++) {
char *file = argv[i];
int const sjval = setjmp(jmpenv);
int len;
@ -418,14 +434,14 @@ main(int argc, char const *argv[])
* function but does not call it. Since ftrace.o should
* not be traced anyway, we just skip it.
*/
len = strlen(argv[0]);
len = strlen(file);
if (len >= ftrace_size &&
strcmp(argv[0] + (len - ftrace_size), ftrace) == 0)
strcmp(file + (len - ftrace_size), ftrace) == 0)
continue;
switch (sjval) {
default:
fprintf(stderr, "internal error: %s\n", argv[0]);
fprintf(stderr, "internal error: %s\n", file);
exit(1);
break;
case SJ_SETJMP: /* normal sequence */
@ -433,7 +449,7 @@ main(int argc, char const *argv[])
fd_map = -1;
ehdr_curr = NULL;
mmap_failed = 1;
do_file(argv[0]);
do_file(file);
break;
case SJ_FAIL: /* error in do_file or below */
++n_error;

22
scripts/recordmcount.h
View File

@ -313,7 +313,8 @@ static uint_t *sift_rel_mcount(uint_t *mlocp,
* into nops.
*/
static void nop_mcount(Elf_Shdr const *const relhdr,
Elf_Ehdr const *const ehdr)
Elf_Ehdr const *const ehdr,
const char *const txtname)
{
Elf_Shdr *const shdr0 = (Elf_Shdr *)(_w(ehdr->e_shoff)
+ (void *)ehdr);
@ -336,6 +337,7 @@ static void nop_mcount(Elf_Shdr const *const relhdr,
unsigned mcountsym = 0;
unsigned t;
int once = 0;
for (t = nrel; t; --t) {
int ret = -1;
@ -353,8 +355,18 @@ static void nop_mcount(Elf_Shdr const *const relhdr,
mcountsym = Elf_r_sym(relp);
}
if (mcountsym == Elf_r_sym(relp) && !is_fake_mcount(relp))
ret = make_nop((void *)ehdr, shdr->sh_offset + relp->r_offset);
if (mcountsym == Elf_r_sym(relp) && !is_fake_mcount(relp)) {
if (make_nop)
ret = make_nop((void *)ehdr, shdr->sh_offset + relp->r_offset);
if (warn_on_notrace_sect && !once) {
printf("Section %s has mcount callers being ignored\n",
txtname);
once = 1;
/* just warn? */
if (!make_nop)
return;
}
}
/*
* If we successfully removed the mcount, mark the relocation
@ -501,12 +513,12 @@ do_func(Elf_Ehdr *const ehdr, char const *const fname, unsigned const reltype)
mlocp = sift_rel_mcount(mlocp,
(void *)mlocp - (void *)mloc0, &mrelp,
relhdr, ehdr, recsym, recval, reltype);
} else if (make_nop && txtname) {
} else if (txtname && (warn_on_notrace_sect || make_nop)) {
/*
* This section is ignored by ftrace, but still
* has mcount calls. Convert them to nops now.
*/
nop_mcount(relhdr, ehdr);
nop_mcount(relhdr, ehdr, txtname);
}
}
if (mloc0 != mlocp) {