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perf: Move arch specific code into separate arch directory 

The perf userspace tool included some architecture specific code to map
registers from the DWARF register number into the names used by the regs
and stack access API.

This moves the architecture specific code out into a separate
arch/x86 directory along with the infrastructure required to use it.

Signed-off-by: Ian Munsie <imunsie@au.ibm.com>
Acked-by: Masami Hiramatsu <mhiramat@redhat.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Ian Munsie 2010-04-20 16:58:32 +10:00 committed by Paul Mackerras
parent 6eca8cc35b
commit cd932c5939
5 changed files with 119 additions and 59 deletions
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36
tools/perf/Makefile
View File

@ -173,6 +173,20 @@ uname_R := $(shell sh -c 'uname -r 2>/dev/null || echo not')
uname_P := $(shell sh -c 'uname -p 2>/dev/null || echo not')
uname_V := $(shell sh -c 'uname -v 2>/dev/null || echo not')
ARCH ?= $(shell echo $(uname_M) | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
-e s/arm.*/arm/ -e s/sa110/arm/ \
-e s/s390x/s390/ -e s/parisc64/parisc/ \
-e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
-e s/sh[234].*/sh/ )
# Additional ARCH settings for x86
ifeq ($(ARCH),i386)
ARCH := x86
endif
ifeq ($(ARCH),x86_64)
ARCH := x86
endif
# CFLAGS and LDFLAGS are for the users to override from the command line.
#
@ -285,7 +299,7 @@ endif
# Those must not be GNU-specific; they are shared with perl/ which may
# be built by a different compiler. (Note that this is an artifact now
# but it still might be nice to keep that distinction.)
BASIC_CFLAGS = -Iutil/include
BASIC_CFLAGS = -Iutil/include -Iarch/$(ARCH)/include
BASIC_LDFLAGS =
# Guard against environment variables
@ -367,6 +381,7 @@ LIB_H += util/include/asm/byteorder.h
LIB_H += util/include/asm/swab.h
LIB_H += util/include/asm/system.h
LIB_H += util/include/asm/uaccess.h
LIB_H += util/include/dwarf-regs.h
LIB_H += perf.h
LIB_H += util/cache.h
LIB_H += util/callchain.h
@ -487,6 +502,15 @@ PERFLIBS = $(LIB_FILE)
-include config.mak.autogen
-include config.mak
ifndef NO_DWARF
ifneq ($(shell sh -c "(echo '\#include <dwarf.h>'; echo '\#include <libdw.h>'; echo 'int main(void) { Dwarf *dbg; dbg = dwarf_begin(0, DWARF_C_READ); return (long)dbg; }') | $(CC) -x c - $(ALL_CFLAGS) -I/usr/include/elfutils -ldw -lelf -o $(BITBUCKET) $(ALL_LDFLAGS) $(EXTLIBS) "$(QUIET_STDERR)" && echo y"), y)
msg := $(warning No libdw.h found or old libdw.h found, disables dwarf support. Please install elfutils-devel/elfutils-dev);
NO_DWARF := 1
endif # Dwarf support
endif # NO_DWARF
-include arch/$(ARCH)/Makefile
ifeq ($(uname_S),Darwin)
ifndef NO_FINK
ifeq ($(shell test -d /sw/lib && echo y),y)
@ -519,15 +543,15 @@ else
msg := $(error No libelf.h/libelf found, please install libelf-dev/elfutils-libelf-devel and glibc-dev[el]);
endif
ifneq ($(shell sh -c "(echo '\#include <dwarf.h>'; echo '\#include <libdw.h>'; echo 'int main(void) { Dwarf *dbg; dbg = dwarf_begin(0, DWARF_C_READ); return (long)dbg; }') | $(CC) -x c - $(ALL_CFLAGS) -I/usr/include/elfutils -ldw -lelf -o $(BITBUCKET) $(ALL_LDFLAGS) $(EXTLIBS) "$(QUIET_STDERR)" && echo y"), y)
msg := $(warning No libdw.h found or old libdw.h found, disables dwarf support. Please install elfutils-devel/elfutils-dev);
else
ifndef NO_DWARF
ifeq ($(origin PERF_HAVE_DWARF_REGS), undefined)
msg := $(warning DWARF register mappings have not been defined for architecture $(ARCH), DWARF support disabled);
else
BASIC_CFLAGS += -I/usr/include/elfutils -DDWARF_SUPPORT
EXTLIBS += -lelf -ldw
LIB_OBJS += $(OUTPUT)util/probe-finder.o
endif
endif
endif # PERF_HAVE_DWARF_REGS
endif # NO_DWARF
ifneq ($(shell sh -c "(echo '\#include <newt.h>'; echo 'int main(void) { newtInit(); newtCls(); return newtFinished(); }') | $(CC) -x c - $(ALL_CFLAGS) -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -lnewt -o $(BITBUCKET) $(ALL_LDFLAGS) $(EXTLIBS) "$(QUIET_STDERR)" && echo y"), y)
msg := $(warning newt not found, disables TUI support. Please install newt-devel or libnewt-dev);

4
tools/perf/arch/x86/Makefile Normal file
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@ -0,0 +1,4 @@
ifndef NO_DWARF
PERF_HAVE_DWARF_REGS := 1
LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/dwarf-regs.o
endif

75
tools/perf/arch/x86/util/dwarf-regs.c Normal file
View File

@ -0,0 +1,75 @@
/*
* dwarf-regs.c : Mapping of DWARF debug register numbers into register names.
* Extracted from probe-finder.c
*
* Written by Masami Hiramatsu <mhiramat@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#include <libio.h>
#include <dwarf-regs.h>
/*
* Generic dwarf analysis helpers
*/
#define X86_32_MAX_REGS 8
const char *x86_32_regs_table[X86_32_MAX_REGS] = {
"%ax",
"%cx",
"%dx",
"%bx",
"$stack", /* Stack address instead of %sp */
"%bp",
"%si",
"%di",
};
#define X86_64_MAX_REGS 16
const char *x86_64_regs_table[X86_64_MAX_REGS] = {
"%ax",
"%dx",
"%cx",
"%bx",
"%si",
"%di",
"%bp",
"%sp",
"%r8",
"%r9",
"%r10",
"%r11",
"%r12",
"%r13",
"%r14",
"%r15",
};
/* TODO: switching by dwarf address size */
#ifdef __x86_64__
#define ARCH_MAX_REGS X86_64_MAX_REGS
#define arch_regs_table x86_64_regs_table
#else
#define ARCH_MAX_REGS X86_32_MAX_REGS
#define arch_regs_table x86_32_regs_table
#endif
/* Return architecture dependent register string (for kprobe-tracer) */
const char *get_arch_regstr(unsigned int n)
{
return (n <= ARCH_MAX_REGS) ? arch_regs_table[n] : NULL;
}

8
tools/perf/util/include/dwarf-regs.h Normal file
View File

@ -0,0 +1,8 @@
#ifndef _PERF_DWARF_REGS_H_
#define _PERF_DWARF_REGS_H_
#ifdef DWARF_SUPPORT
const char *get_arch_regstr(unsigned int n);
#endif
#endif

55
tools/perf/util/probe-finder.c
View File

@ -31,6 +31,7 @@
#include <string.h>
#include <stdarg.h>
#include <ctype.h>
#include <dwarf-regs.h>
#include "string.h"
#include "event.h"
@ -38,61 +39,9 @@
#include "util.h"
#include "probe-finder.h"
/*
* Generic dwarf analysis helpers
*/
#define X86_32_MAX_REGS 8
const char *x86_32_regs_table[X86_32_MAX_REGS] = {
"%ax",
"%cx",
"%dx",
"%bx",
"$stack", /* Stack address instead of %sp */
"%bp",
"%si",
"%di",
};
#define X86_64_MAX_REGS 16
const char *x86_64_regs_table[X86_64_MAX_REGS] = {
"%ax",
"%dx",
"%cx",
"%bx",
"%si",
"%di",
"%bp",
"%sp",
"%r8",
"%r9",
"%r10",
"%r11",
"%r12",
"%r13",
"%r14",
"%r15",
};
/* TODO: switching by dwarf address size */
#ifdef __x86_64__
#define ARCH_MAX_REGS X86_64_MAX_REGS
#define arch_regs_table x86_64_regs_table
#else
#define ARCH_MAX_REGS X86_32_MAX_REGS
#define arch_regs_table x86_32_regs_table
#endif
/* Kprobe tracer basic type is up to u64 */
#define MAX_BASIC_TYPE_BITS 64
/* Return architecture dependent register string (for kprobe-tracer) */
static const char *get_arch_regstr(unsigned int n)
{
return (n <= ARCH_MAX_REGS) ? arch_regs_table[n] : NULL;
}
/*
* Compare the tail of two strings.
* Return 0 if whole of either string is same as another's tail part.
@ -447,7 +396,7 @@ static int convert_location(Dwarf_Op *op, struct probe_finder *pf)
regs = get_arch_regstr(regn);
if (!regs) {
pr_warning("%u exceeds max register number.\n", regn);
pr_warning("Mapping for DWARF register number %u missing on this architecture.", regn);
return -ERANGE;
}