Commit 0337cf74 authored by Hendrik Brueckner's avatar Hendrik Brueckner Committed by Arnaldo Carvalho de Melo
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perf util: Introduce architecture specific errno/name mapping 



Introduce a script that generates a mapping of errno numbers to their
names for each architecture that is supported by perf (i.e.  has a
subdirectory in tools/perf/arch/).

The errno mapping is generated as part of the trace beautifiers and can
be used by including the trace/beauty/arch_errno_names.c file.  Then,
use arch_syscalls__strerrno() to look up an errno value to obtain the
errno name (e.g. ENOENT) for a particular architecture.

Signed-off-by: default avatarHendrik Brueckner <brueckner@linux.vnet.ibm.com>
Reviewed-by: default avatarThomas Richter <tmricht@linux.vnet.ibm.com>
Suggested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: linux-s390@vger.kernel.org
LPU-Reference: 1516352177-11106-4-git-send-email-brueckner@linux.vnet.ibm.com
Link: https://lkml.kernel.org/n/tip-8zlsjnuoep2ww39aq5z41fno@git.kernel.org


[ Make x86 be the first arch, most common, add newline to last line, fixing build on centos:5 ]
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 28b8f954

tools/perf/Makefile.perf

+11 −2
Original line number Diff line number Diff line
@@ -462,6 +462,13 @@ prctl_option_tbl := $(srctree)/tools/perf/trace/beauty/prctl_option.sh 
$(prctl_option_array): $(prctl_hdr_dir)/prctl.h $(prctl_option_tbl)

	$(Q)$(SHELL) '$(prctl_option_tbl)' $(prctl_hdr_dir) > $@



arch_errno_name_array := $(beauty_outdir)/arch_errno_name_array.c

arch_errno_hdr_dir := $(srctree)/tools

arch_errno_tbl := $(srctree)/tools/perf/trace/beauty/arch_errno_names.sh



$(arch_errno_name_array): $(arch_errno_tbl)

	$(Q)$(SHELL) '$(arch_errno_tbl)' $(CC) $(arch_errno_hdr_dir) > $@



all: shell_compatibility_test $(ALL_PROGRAMS) $(LANG_BINDINGS) $(OTHER_PROGRAMS)



$(OUTPUT)python/perf.so: $(PYTHON_EXT_SRCS) $(PYTHON_EXT_DEPS) $(LIBTRACEEVENT_DYNAMIC_LIST)
@@ -565,7 +572,8 @@ prepare: $(OUTPUT)PERF-VERSION-FILE $(OUTPUT)common-cmds.h archheaders $(drm_ioc 
	$(vhost_virtio_ioctl_array) \

	$(madvise_behavior_array) \

	$(perf_ioctl_array) \

	$(prctl_option_array)

	$(prctl_option_array) \

	$(arch_errno_name_array)



$(OUTPUT)%.o: %.c prepare FORCE

	$(Q)$(MAKE) -f $(srctree)/tools/build/Makefile.build dir=$(build-dir) $@
@@ -847,7 +855,8 @@ clean:: $(LIBTRACEEVENT)-clean $(LIBAPI)-clean $(LIBBPF)-clean $(LIBSUBCMD)-clea 
		$(OUTPUT)$(kcmp_type_array) \

		$(OUTPUT)$(vhost_virtio_ioctl_array) \

		$(OUTPUT)$(perf_ioctl_array) \

		$(OUTPUT)$(prctl_option_array)

		$(OUTPUT)$(prctl_option_array) \

		$(OUTPUT)$(arch_errno_name_array)

	$(QUIET_SUBDIR0)Documentation $(QUIET_SUBDIR1) clean



#

tools/perf/trace/beauty/arch_errno_names.c

0 → 100644
+1 −0
Original line number Diff line number Diff line 
#include "trace/beauty/generated/arch_errno_name_array.c"

tools/perf/trace/beauty/arch_errno_names.sh

0 → 100755
+100 −0
Original line number Diff line number Diff line 
#!/bin/sh

# SPDX-License-Identifier: GPL-2.0

#

# Generate C file mapping errno codes to errno names.

#

# Copyright IBM Corp. 2018

# Author(s):  Hendrik Brueckner <brueckner@linux.vnet.ibm.com>



gcc="$1"

toolsdir="$2"

include_path="-I$toolsdir/include/uapi"



arch_string()

{

	echo "$1" |sed -e 'y/- /__/' |tr '[[:upper:]]' '[[:lower:]]'

}



asm_errno_file()

{

	local arch="$1"

	local header



	header="$toolsdir/arch/$arch/include/uapi/asm/errno.h"

	if test -r "$header"; then

		echo "$header"

	else

		echo "$toolsdir/include/uapi/asm-generic/errno.h"

	fi

}



create_errno_lookup_func()

{

	local arch=$(arch_string "$1")

	local nr name



	cat <<EoFuncBegin

static const char *errno_to_name__$arch(int err)

{

	switch (err) {

EoFuncBegin



	while read name nr; do

		printf '\tcase %d: return "%s";\n' $nr $name

	done



	cat <<EoFuncEnd

	default:

		return "(unknown)";

	}

}



EoFuncEnd

}



process_arch()

{

	local arch="$1"

	local asm_errno=$(asm_errno_file "$arch")



	$gcc $include_path -E -dM -x c $asm_errno \

		|grep -hE '^#define[[:blank:]]+(E[^[:blank:]]+)[[:blank:]]+([[:digit:]]+).*' \

		|awk '{ print $2","$3; }' \

		|sort -t, -k2 -nu \

		|IFS=, create_errno_lookup_func "$arch"

}



create_arch_errno_table_func()

{

	local archlist="$1"

	local default="$2"

	local arch



	printf 'const char *arch_syscalls__strerrno(const char *arch, int err)\n'

	printf '{\n'

	for arch in $archlist; do

		printf '\tif (!strcmp(arch, "%s"))\n' $(arch_string "$arch")

		printf '\t\treturn errno_to_name__%s(err);\n' $(arch_string "$arch")

	done

	printf '\treturn errno_to_name__%s(err);\n' $(arch_string "$default")

	printf '}\n'

}



cat <<EoHEADER

/* SPDX-License-Identifier: GPL-2.0 */



#include <string.h>



EoHEADER



# Create list of architectures and ignore those that do not appear

# in tools/perf/arch

archlist=""

for arch in $(find $toolsdir/arch -maxdepth 1 -mindepth 1 -type d -printf "%f\n" | grep -v x86 | sort); do

	test -d arch/$arch && archlist="$archlist $arch"

done



for arch in x86 $archlist generic; do

	process_arch "$arch"

done

create_arch_errno_table_func "x86 $archlist" "generic"

tools/perf/trace/beauty/beauty.h

+2 −0
Original line number Diff line number Diff line
@@ -114,4 +114,6 @@ size_t open__scnprintf_flags(unsigned long flags, char *bf, size_t size); 
void syscall_arg__set_ret_scnprintf(struct syscall_arg *arg,

				    size_t (*ret_scnprintf)(char *bf, size_t size, struct syscall_arg *arg));



const char *arch_syscalls__strerrno(const char *arch, int err);



#endif /* _PERF_TRACE_BEAUTY_H */

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