linux-kernel - [PATCH 2/3] perf powerpc: Generate system call table from asm/unistd.h

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Message-Id: <20180129083417.31240-3-ravi.bangoria@linux.vnet.ibm.com>
Date:   Mon, 29 Jan 2018 14:04:16 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
To:     acme@...nel.org
Cc:     alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, linux-kernel@...r.kernel.org,
        brueckner@...ux.vnet.ibm.com, tmricht@...ux.vnet.ibm.com,
        linuxppc-dev@...ts.ozlabs.org, mpe@...erman.id.au,
        Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Subject: [PATCH 2/3] perf powerpc: Generate system call table from asm/unistd.h

This should speed up accessing new system calls introduced with
the kernel rather than waiting for libaudit updates to include
them.

Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
---
 tools/perf/arch/powerpc/Makefile                   | 21 +++++++++++++
 .../perf/arch/powerpc/entry/syscalls/mksyscalltbl  | 35 ++++++++++++++++++++++
 2 files changed, 56 insertions(+)
 create mode 100755 tools/perf/arch/powerpc/entry/syscalls/mksyscalltbl

diff --git a/tools/perf/arch/powerpc/Makefile b/tools/perf/arch/powerpc/Makefile
index 42dab7c..c93e8f4 100644
--- a/tools/perf/arch/powerpc/Makefile
+++ b/tools/perf/arch/powerpc/Makefile
@@ -6,3 +6,24 @@ endif
 HAVE_KVM_STAT_SUPPORT := 1
 PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET := 1
 PERF_HAVE_JITDUMP := 1
+
+#
+# Syscall table generation for perf
+#
+
+out    := $(OUTPUT)arch/powerpc/include/generated/asm
+header := $(out)/syscalls_64.c
+sysdef := $(srctree)/tools/arch/powerpc/include/uapi/asm/unistd.h
+sysprf := $(srctree)/tools/perf/arch/powerpc/entry/syscalls/
+systbl := $(sysprf)/mksyscalltbl
+
+# Create output directory if not already present
+_dummy := $(shell [ -d '$(out)' ] || mkdir -p '$(out)')
+
+$(header): $(sysdef) $(systbl)
+	$(Q)$(SHELL) '$(systbl)' '$(CC)' $(sysdef) > $@
+
+clean::
+	$(call QUIET_CLEAN, powerpc) $(RM) $(header)
+
+archheaders: $(header)
diff --git a/tools/perf/arch/powerpc/entry/syscalls/mksyscalltbl b/tools/perf/arch/powerpc/entry/syscalls/mksyscalltbl
new file mode 100755
index 0000000..975947c
--- /dev/null
+++ b/tools/perf/arch/powerpc/entry/syscalls/mksyscalltbl
@@ -0,0 +1,35 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+#
+# Generate system call table for perf. Derived from
+# s390 script.
+#
+# Copyright IBM Corp. 2017
+# Author(s):  Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>
+# Changed by: Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
+
+gcc=$1
+input=$2
+
+if ! test -r $input; then
+	echo "Could not read input file" >&2
+	exit 1
+fi
+
+create_table()
+{
+	local max_nr
+
+	echo 'static const char *syscalltbl_powerpc_64[] = {'
+	while read sc nr; do
+		printf '\t[%d] = "%s",\n' $nr $sc
+		max_nr=$nr
+	done
+	echo '};'
+	echo "#define SYSCALLTBL_POWERPC_64_MAX_ID $max_nr"
+}
+
+$gcc -m64 -E -dM -x c  $input	       \
+	|sed -ne 's/^#define __NR_//p' \
+	|sort -t' ' -k2 -nu	       \
+	|create_table
-- 
1.8.3.1