Patchwork [v3,1/2] perf: Move arch specific code into separate arch directory

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Submitter Ian Munsie
Date April 15, 2010, 3:57 a.m.
Message ID <1271303822-11542-2-git-send-email-imunsie@au.ibm.com>
Download mbox | patch
Permalink /patch/50210/
State Not Applicable
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Ian Munsie - April 15, 2010, 3:57 a.m.
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 v2: From Masami Hiramatsu's feedback DWARF support is disabled
altogether if the architecture specific Makefile does not define
PERF_HAVE_DWARF_REGS - ie, DWARF register mappings are missing for the
architecture. A message indicating this is printed out during compilation.

 tools/perf/Makefile                   |   26 ++++++++++-
 tools/perf/arch/x86/Makefile          |    2 +
 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, 110 insertions(+), 56 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
Masami Hiramatsu - April 15, 2010, 3:19 p.m.
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>

Good work!

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

Thank you very much!

> ---
> Changes since v2: From Masami Hiramatsu's feedback DWARF support is disabled
> altogether if the architecture specific Makefile does not define
> PERF_HAVE_DWARF_REGS - ie, DWARF register mappings are missing for the
> architecture. A message indicating this is printed out during compilation.
> 
>  tools/perf/Makefile                   |   26 ++++++++++-
>  tools/perf/arch/x86/Makefile          |    2 +
>  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, 110 insertions(+), 56 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 57b3569..269d5dd 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
> @@ -485,6 +500,7 @@ PERFLIBS = $(LIB_FILE)
>  
>  -include config.mak.autogen
>  -include config.mak
> +-include arch/$(ARCH)/Makefile
>  
>  ifeq ($(uname_S),Darwin)
>  	ifndef NO_FINK
> @@ -521,12 +537,16 @@ endif
>  ifneq ($(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 := $(warning No libdw.h found or old libdw.h found, disables dwarf support. Please install elfutils-devel/elfutils-dev);
>  else
> +ifeq ($(origin PERF_HAVE_DWARF_REGS), undefined)
> +	msg := $(warning DWARF register mappings have not been defined for architecture $(ARCH), DWARF support disabled);
> +else
>  ifndef NO_DWARF
>  	BASIC_CFLAGS += -I/usr/include/elfutils -DDWARF_SUPPORT
>  	EXTLIBS += -lelf -ldw
>  	LIB_OBJS += $(OUTPUT)util/probe-finder.o
> -endif
> -endif
> +endif # NO_DWARF
> +endif # PERF_HAVE_DWARF_REGS
> +endif # Dwarf support
>  
>  ifneq ($(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..cbd7833
> --- /dev/null
> +++ b/tools/perf/arch/x86/Makefile
> @@ -0,0 +1,2 @@
> +PERF_HAVE_DWARF_REGS := 1
> +LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/dwarf-regs.o
> 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",
> +	"$stack",	/* Stack address instead of %sp */
> +	"%bp",
> +	"%si",
> +	"%di",
> +};
> +
> +#define X86_64_MAX_REGS 16
> +const char *x86_64_regs_table[X86_64_MAX_REGS] = {
> +	"%ax",
> +	"%dx",
> +	"%cx",
> +	"%bx",
> +	"%si",
> +	"%di",
> +	"%bp",
> +	"%sp",
> +	"%r8",
> +	"%r9",
> +	"%r10",
> +	"%r11",
> +	"%r12",
> +	"%r13",
> +	"%r14",
> +	"%r15",
> +};
> +
> +/* TODO: switching by dwarf address size */
> +#ifdef __x86_64__
> +#define ARCH_MAX_REGS X86_64_MAX_REGS
> +#define arch_regs_table x86_64_regs_table
> +#else
> +#define ARCH_MAX_REGS X86_32_MAX_REGS
> +#define arch_regs_table x86_32_regs_table
> +#endif
> +
> +/* Return architecture dependent register string (for kprobe-tracer) */
> +const char *get_arch_regstr(unsigned int n)
> +{
> +	return (n <= ARCH_MAX_REGS) ? arch_regs_table[n] : NULL;
> +}
> diff --git a/tools/perf/util/include/dwarf-regs.h b/tools/perf/util/include/dwarf-regs.h
> new file mode 100644
> index 0000000..cf6727e
> --- /dev/null
> +++ b/tools/perf/util/include/dwarf-regs.h
> @@ -0,0 +1,8 @@
> +#ifndef _PERF_DWARF_REGS_H_
> +#define _PERF_DWARF_REGS_H_
> +
> +#ifdef DWARF_SUPPORT
> +const char *get_arch_regstr(unsigned int n);
> +#endif
> +
> +#endif
> diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
> index a851377..83e5bd8 100644
> --- a/tools/perf/util/probe-finder.c
> +++ b/tools/perf/util/probe-finder.c
> @@ -31,6 +31,7 @@
>  #include <string.h>
>  #include <stdarg.h>
>  #include <ctype.h>
> +#include <dwarf-regs.h>
>  
>  #include "string.h"
>  #include "event.h"
> @@ -38,58 +39,6 @@
>  #include "util.h"
>  #include "probe-finder.h"
>  
> -
> -/*
> - * Generic dwarf analysis helpers
> - */
> -
> -#define X86_32_MAX_REGS 8
> -const char *x86_32_regs_table[X86_32_MAX_REGS] = {
> -	"%ax",
> -	"%cx",
> -	"%dx",
> -	"%bx",
> -	"$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
> -
> -/* 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.
> @@ -397,7 +346,7 @@ static void convert_location(Dwarf_Op *op, struct probe_finder *pf)
>  
>  	regs = get_arch_regstr(regn);
>  	if (!regs)
> -		die("%u exceeds max register number.", regn);
> +		die("Mapping for DWARF register number %u missing on this architecture.", regn);
>  
>  	tvar->value = xstrdup(regs);
>  	if (ref) {

Patch

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 57b3569..269d5dd 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
@@ -485,6 +500,7 @@  PERFLIBS = $(LIB_FILE)
 
 -include config.mak.autogen
 -include config.mak
+-include arch/$(ARCH)/Makefile
 
 ifeq ($(uname_S),Darwin)
 	ifndef NO_FINK
@@ -521,12 +537,16 @@  endif
 ifneq ($(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 := $(warning No libdw.h found or old libdw.h found, disables dwarf support. Please install elfutils-devel/elfutils-dev);
 else
+ifeq ($(origin PERF_HAVE_DWARF_REGS), undefined)
+	msg := $(warning DWARF register mappings have not been defined for architecture $(ARCH), DWARF support disabled);
+else
 ifndef NO_DWARF
 	BASIC_CFLAGS += -I/usr/include/elfutils -DDWARF_SUPPORT
 	EXTLIBS += -lelf -ldw
 	LIB_OBJS += $(OUTPUT)util/probe-finder.o
-endif
-endif
+endif # NO_DWARF
+endif # PERF_HAVE_DWARF_REGS
+endif # Dwarf support
 
 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..cbd7833
--- /dev/null
+++ b/tools/perf/arch/x86/Makefile
@@ -0,0 +1,2 @@ 
+PERF_HAVE_DWARF_REGS := 1
+LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/dwarf-regs.o
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 a851377..83e5bd8 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"
@@ -38,58 +39,6 @@ 
 #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
-
-/* 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.
@@ -397,7 +346,7 @@  static void convert_location(Dwarf_Op *op, struct probe_finder *pf)
 
 	regs = get_arch_regstr(regn);
 	if (!regs)
-		die("%u exceeds max register number.", regn);
+		die("Mapping for DWARF register number %u missing on this architecture.", regn);
 
 	tvar->value = xstrdup(regs);
 	if (ref) {