mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-21 12:30:06 +00:00
Support profiling PIE [BZ #22284]
Since PIE can be loaded at any address, we need to subtract load address from PCs. [BZ #22284] * gmon/Makefile [$(have-fpie)$(build-shared) == yesyes] (tests, tests-pie): Add tst-gmon-pie. (CFLAGS-tst-gmon-pie.c): New. (CRT-tst-gmon-pie): Likewise. (tst-gmon-pie-ENV): Likewise. [$(have-fpie)$(build-shared) == yesyes] (tests-special): Likewise. ($(objpfx)tst-gmon-pie.out): Likewise. (clean-tst-gmon-pie-data): Likewise. ($(objpfx)tst-gmon-pie-gprof.out): Likewise. * gmon/gmon.c [PIC]: Include <link.h>. [PIC] (callback): New function. (write_hist): Add an argument for load address. Subtract load address from PCs. (write_call_graph): Likewise. (write_gmon): Call __dl_iterate_phdr to get load address, pass it to write_hist and write_call_graph. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
H.J. Lu
parent
bc9620d040
commit
d165ca6498
20
ChangeLog
20
ChangeLog
@ -1,3 +1,23 @@
|
||||
2017-10-12 H.J. Lu <hongjiu.lu@intel.com>
|
||||
|
||||
[BZ #22284]
|
||||
* gmon/Makefile [$(have-fpie)$(build-shared) == yesyes] (tests,
|
||||
tests-pie): Add tst-gmon-pie.
|
||||
(CFLAGS-tst-gmon-pie.c): New.
|
||||
(CRT-tst-gmon-pie): Likewise.
|
||||
(tst-gmon-pie-ENV): Likewise.
|
||||
[$(have-fpie)$(build-shared) == yesyes] (tests-special): Likewise.
|
||||
($(objpfx)tst-gmon-pie.out): Likewise.
|
||||
(clean-tst-gmon-pie-data): Likewise.
|
||||
($(objpfx)tst-gmon-pie-gprof.out): Likewise.
|
||||
* gmon/gmon.c [PIC]: Include <link.h>.
|
||||
[PIC] (callback): New function.
|
||||
(write_hist): Add an argument for load address. Subtract load
|
||||
address from PCs.
|
||||
(write_call_graph): Likewise.
|
||||
(write_gmon): Call __dl_iterate_phdr to get load address, pass
|
||||
it to write_hist and write_call_graph.
|
||||
|
||||
2017-10-11 Joseph Myers <joseph@codesourcery.com>
|
||||
|
||||
* math/Makefile (test-types-basic): New variable.
|
||||
|
||||
@ -33,6 +33,11 @@ tests-static += tst-profile-static
|
||||
LDFLAGS-tst-profile-static = -profile
|
||||
endif
|
||||
|
||||
ifeq (yesyes,$(have-fpie)$(build-shared))
|
||||
tests += tst-gmon-pie
|
||||
tests-pie += tst-gmon-pie
|
||||
endif
|
||||
|
||||
# The mcount code won't work without a frame pointer.
|
||||
CFLAGS-mcount.c := -fno-omit-frame-pointer
|
||||
|
||||
@ -44,6 +49,14 @@ ifeq ($(run-built-tests),yes)
|
||||
tests-special += $(objpfx)tst-gmon-gprof.out
|
||||
endif
|
||||
|
||||
CFLAGS-tst-gmon-pie.c := $(PIE-ccflag) -fno-omit-frame-pointer -pg
|
||||
CRT-tst-gmon-pie := $(csu-objpfx)gcrt1.o
|
||||
tst-gmon-pie-ENV := GMON_OUT_PREFIX=$(objpfx)tst-gmon-pie.data
|
||||
ifeq ($(run-built-tests),yes)
|
||||
tests-special += $(objpfx)tst-gmon-pie-gprof.out
|
||||
endif
|
||||
|
||||
|
||||
include ../Rules
|
||||
|
||||
# We cannot compile mcount.c with -pg because that would
|
||||
@ -69,3 +82,11 @@ clean-tst-gmon-data:
|
||||
$(objpfx)tst-gmon-gprof.out: tst-gmon-gprof.sh $(objpfx)tst-gmon.out
|
||||
$(SHELL) $< $(GPROF) $(objpfx)tst-gmon $(objpfx)tst-gmon.data.* > $@; \
|
||||
$(evaluate-test)
|
||||
|
||||
$(objpfx)tst-gmon-pie.out: clean-tst-gmon-pie-data
|
||||
clean-tst-gmon-pie-data:
|
||||
rm -f $(objpfx)tst-gmon-pie.data.*
|
||||
|
||||
$(objpfx)tst-gmon-pie-gprof.out: tst-gmon-gprof.sh $(objpfx)tst-gmon-pie.out
|
||||
$(SHELL) $< $(GPROF) $(objpfx)tst-gmon-pie $(objpfx)tst-gmon-pie.data.* > $@; \
|
||||
$(evaluate-test)
|
||||
|
||||
47
gmon/gmon.c
47
gmon/gmon.c
@ -46,6 +46,26 @@
|
||||
#include <libc-internal.h>
|
||||
#include <not-cancel.h>
|
||||
|
||||
#ifdef PIC
|
||||
# include <link.h>
|
||||
|
||||
static int
|
||||
callback (struct dl_phdr_info *info, size_t size, void *data)
|
||||
{
|
||||
if (info->dlpi_name[0] == '\0')
|
||||
{
|
||||
/* The link map for the executable is created by calling
|
||||
_dl_new_object with "" as filename. dl_iterate_phdr
|
||||
calls the callback function with filename from the
|
||||
link map as dlpi_name. */
|
||||
u_long *load_address = data;
|
||||
*load_address = (u_long) info->dlpi_addr;
|
||||
return 1;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
/* Head of basic-block list or NULL. */
|
||||
struct __bb *__bb_head attribute_hidden;
|
||||
@ -63,8 +83,8 @@ static int s_scale;
|
||||
void moncontrol (int mode);
|
||||
void __moncontrol (int mode);
|
||||
libc_hidden_proto (__moncontrol)
|
||||
static void write_hist (int fd);
|
||||
static void write_call_graph (int fd);
|
||||
static void write_hist (int fd, u_long load_address);
|
||||
static void write_call_graph (int fd, u_long load_address);
|
||||
static void write_bb_counts (int fd);
|
||||
|
||||
/*
|
||||
@ -173,7 +193,7 @@ weak_alias (__monstartup, monstartup)
|
||||
|
||||
|
||||
static void
|
||||
write_hist (int fd)
|
||||
write_hist (int fd, u_long load_address)
|
||||
{
|
||||
u_char tag = GMON_TAG_TIME_HIST;
|
||||
|
||||
@ -210,8 +230,8 @@ write_hist (int fd)
|
||||
!= offsetof (struct gmon_hist_hdr, dimen_abbrev)))
|
||||
abort ();
|
||||
|
||||
thdr.low_pc = (char *) _gmonparam.lowpc;
|
||||
thdr.high_pc = (char *) _gmonparam.highpc;
|
||||
thdr.low_pc = (char *) _gmonparam.lowpc - load_address;
|
||||
thdr.high_pc = (char *) _gmonparam.highpc - load_address;
|
||||
thdr.hist_size = _gmonparam.kcountsize / sizeof (HISTCOUNTER);
|
||||
thdr.prof_rate = __profile_frequency ();
|
||||
strncpy (thdr.dimen, "seconds", sizeof (thdr.dimen));
|
||||
@ -223,7 +243,7 @@ write_hist (int fd)
|
||||
|
||||
|
||||
static void
|
||||
write_call_graph (int fd)
|
||||
write_call_graph (int fd, u_long load_address)
|
||||
{
|
||||
#define NARCS_PER_WRITEV 32
|
||||
u_char tag = GMON_TAG_CG_ARC;
|
||||
@ -266,8 +286,9 @@ write_call_graph (int fd)
|
||||
}
|
||||
arc;
|
||||
|
||||
arc.frompc = (char *) frompc;
|
||||
arc.selfpc = (char *) _gmonparam.tos[to_index].selfpc;
|
||||
arc.frompc = (char *) frompc - load_address;
|
||||
arc.selfpc = ((char *) _gmonparam.tos[to_index].selfpc
|
||||
- load_address);
|
||||
arc.count = _gmonparam.tos[to_index].count;
|
||||
memcpy (raw_arc + nfilled, &arc, sizeof (raw_arc [0]));
|
||||
|
||||
@ -376,11 +397,17 @@ write_gmon (void)
|
||||
memset (ghdr.spare, '\0', sizeof (ghdr.spare));
|
||||
__write_nocancel (fd, &ghdr, sizeof (struct gmon_hdr));
|
||||
|
||||
/* Get load_address to profile PIE. */
|
||||
u_long load_address = 0;
|
||||
#ifdef PIC
|
||||
__dl_iterate_phdr (callback, &load_address);
|
||||
#endif
|
||||
|
||||
/* write PC histogram: */
|
||||
write_hist (fd);
|
||||
write_hist (fd, load_address);
|
||||
|
||||
/* write call-graph: */
|
||||
write_call_graph (fd);
|
||||
write_call_graph (fd, load_address);
|
||||
|
||||
/* write basic-block execution counts: */
|
||||
write_bb_counts (fd);
|
||||
|
||||
1
gmon/tst-gmon-pie.c
Normal file
1
gmon/tst-gmon-pie.c
Normal file
@ -0,0 +1 @@
|
||||
#include "tst-gmon.c"
|
||||
Loading…
Reference in New Issue
Block a user