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SubjectRe: [PATCH v4 1/2] perf: Move arch specific code into separate arch directory
Hi Ian,

Please feel free to add my ack. :)

Acked-by: Masami Hiramatsu <mhiramat@redhat.com>

Ingo, I think this one is important enhancement for perf
to port it on other archs.

Thank you,

Ian Munsie wrote:
> From: Ian Munsie <imunsie@au.ibm.com>
>
> 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 patch 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>
> ---
> Changes since v3:
> * Move the check for DWARF support prior to the inclusion of the arch specific
> Makefile so that the arch specific Makefile can include the relevant files in
> the build only if DWARF support is available.
> * Fix NO_DWARF build
>
> tools/perf/Makefile | 36 +++++++++++++---
> tools/perf/arch/x86/Makefile | 4 ++
> tools/perf/arch/x86/util/dwarf-regs.c | 75 +++++++++++++++++++++++++++++++++
> tools/perf/util/include/dwarf-regs.h | 8 ++++
> tools/perf/util/probe-finder.c | 55 +-----------------------
> 5 files changed, 119 insertions(+), 59 deletions(-)
> create mode 100644 tools/perf/arch/x86/Makefile
> create mode 100644 tools/perf/arch/x86/util/dwarf-regs.c
> create mode 100644 tools/perf/util/include/dwarf-regs.h
>
> diff --git a/tools/perf/Makefile b/tools/perf/Makefile
> index 3cb3449..e8bf2e1 100644
> --- a/tools/perf/Makefile
> +++ b/tools/perf/Makefile
> @@ -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);
> diff --git a/tools/perf/arch/x86/Makefile b/tools/perf/arch/x86/Makefile
> new file mode 100644
> index 0000000..15130b5
> --- /dev/null
> +++ b/tools/perf/arch/x86/Makefile
> @@ -0,0 +1,4 @@
> +ifndef NO_DWARF
> +PERF_HAVE_DWARF_REGS := 1
> +LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/dwarf-regs.o
> +endif
> diff --git a/tools/perf/arch/x86/util/dwarf-regs.c b/tools/perf/arch/x86/util/dwarf-regs.c
> new file mode 100644
> index 0000000..a794d30
> --- /dev/null
> +++ b/tools/perf/arch/x86/util/dwarf-regs.c
> @@ -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",
> + "$stack", /* Stack address instead of %sp */
> + "%bp",
> + "%si",
> + "%di",
> +};
> +
> +#define X86_64_MAX_REGS 16
> +const char *x86_64_regs_table[X86_64_MAX_REGS] = {
> + "%ax",
> + "%dx",
> + "%cx",
> + "%bx",
> + "%si",
> + "%di",
> + "%bp",
> + "%sp",
> + "%r8",
> + "%r9",
> + "%r10",
> + "%r11",
> + "%r12",
> + "%r13",
> + "%r14",
> + "%r15",
> +};
> +
> +/* TODO: switching by dwarf address size */
> +#ifdef __x86_64__
> +#define ARCH_MAX_REGS X86_64_MAX_REGS
> +#define arch_regs_table x86_64_regs_table
> +#else
> +#define ARCH_MAX_REGS X86_32_MAX_REGS
> +#define arch_regs_table x86_32_regs_table
> +#endif
> +
> +/* Return architecture dependent register string (for kprobe-tracer) */
> +const char *get_arch_regstr(unsigned int n)
> +{
> + return (n <= ARCH_MAX_REGS) ? arch_regs_table[n] : NULL;
> +}
> diff --git a/tools/perf/util/include/dwarf-regs.h b/tools/perf/util/include/dwarf-regs.h
> new file mode 100644
> index 0000000..cf6727e
> --- /dev/null
> +++ b/tools/perf/util/include/dwarf-regs.h
> @@ -0,0 +1,8 @@
> +#ifndef _PERF_DWARF_REGS_H_
> +#define _PERF_DWARF_REGS_H_
> +
> +#ifdef DWARF_SUPPORT
> +const char *get_arch_regstr(unsigned int n);
> +#endif
> +
> +#endif
> diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
> index 3e79775..e7ee52f 100644
> --- a/tools/perf/util/probe-finder.c
> +++ b/tools/perf/util/probe-finder.c
> @@ -31,6 +31,7 @@
> #include <string.h>
> #include <stdarg.h>
> #include <ctype.h>
> +#include <dwarf-regs.h>
>
> #include "string.h"
> #include "event.h"
> @@ -38,61 +39,9 @@
> #include "util.h"
> #include "probe-finder.h"
>
> -
> -/*
> - * Generic dwarf analysis helpers
> - */
> -
> -#define X86_32_MAX_REGS 8
> -const char *x86_32_regs_table[X86_32_MAX_REGS] = {
> - "%ax",
> - "%cx",
> - "%dx",
> - "%bx",
> - "$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;
> }
>

--
Masami Hiramatsu
e-mail: mhiramat@redhat.com


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