perf tools: Generate mips syscalls_n64.c syscall table

Grab a copy of arch/mips/kernel/syscalls/syscall_n64.tbl and use it to
generate tools/perf/arch/mips/include/generated/asm/syscalls_n64.c file,
this is similar with commit 1b700c99 ("perf tools: Build syscall
table .c header from kernel's syscall_64.tbl")
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Juxin Gao <gaojuxin@loongson.cn>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Xuefeng Li <lixuefeng@loongson.cn>
Cc: linux-mips@vger.kernel.org
Link: http://lore.kernel.org/lkml/1612409724-3516-4-git-send-email-yangtiezhu@loongson.cnSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/Makefile.config

@@ -32,7 +32,7 @@ ifneq ($(NO_SYSCALL_TABLE),1)
       NO_SYSCALL_TABLE := 0
     endif
   else
-    ifeq ($(SRCARCH),$(filter $(SRCARCH),powerpc arm64 s390))
+    ifeq ($(SRCARCH),$(filter $(SRCARCH),powerpc arm64 s390 mips))
       NO_SYSCALL_TABLE := 0
     endif
   endif
@@ -89,6 +89,7 @@ endif
 
 ifeq ($(ARCH),mips)
   NO_PERF_REGS := 0
+  CFLAGS += -I$(OUTPUT)arch/mips/include/generated
   CFLAGS += -I../../arch/mips/include/uapi -I../../arch/mips/include/generated/uapi
   LIBUNWIND_LIBS = -lunwind -lunwind-mips
 endif

tools/perf/arch/mips/Makefile

@@ -2,3 +2,21 @@
 ifndef NO_DWARF
 PERF_HAVE_DWARF_REGS := 1
 endif
+
+# Syscall table generation for perf
+out    := $(OUTPUT)arch/mips/include/generated/asm
+header := $(out)/syscalls_n64.c
+sysprf := $(srctree)/tools/perf/arch/mips/entry/syscalls
+sysdef := $(sysprf)/syscall_n64.tbl
+systbl := $(sysprf)/mksyscalltbl
+
+# Create output directory if not already present
+_dummy := $(shell [ -d '$(out)' ] || mkdir -p '$(out)')
+
+$(header): $(sysdef) $(systbl)
+	$(Q)$(SHELL) '$(systbl)' $(sysdef) > $@
+
+clean::
+	$(call QUIET_CLEAN, mips) $(RM) $(header)
+
+archheaders: $(header)

tools/perf/arch/mips/entry/syscalls/mksyscalltbl

+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+#
+# Generate system call table for perf. Derived from
+# s390 script.
+#
+# Author(s):  Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
+# Changed by: Tiezhu Yang <yangtiezhu@loongson.cn>
+
+SYSCALL_TBL=$1
+
+if ! test -r $SYSCALL_TBL; then
+	echo "Could not read input file" >&2
+	exit 1
+fi
+
+create_table()
+{
+	local max_nr nr abi sc discard
+
+	echo 'static const char *syscalltbl_mips_n64[] = {'
+	while read nr abi sc discard; do
+		printf '\t[%d] = "%s",\n' $nr $sc
+		max_nr=$nr
+	done
+	echo '};'
+	echo "#define SYSCALLTBL_MIPS_N64_MAX_ID $max_nr"
+}
+
+grep -E "^[[:digit:]]+[[:space:]]+(n64)" $SYSCALL_TBL	\
+	|sort -k1 -n					\
+	|create_table

tools/perf/check-headers.sh

@@ -146,6 +146,7 @@ check arch/x86/lib/insn.c             '-I "^#include [\"<]\(../include/\)*asm/in
 check_2 tools/perf/arch/x86/entry/syscalls/syscall_64.tbl arch/x86/entry/syscalls/syscall_64.tbl
 check_2 tools/perf/arch/powerpc/entry/syscalls/syscall.tbl arch/powerpc/kernel/syscalls/syscall.tbl
 check_2 tools/perf/arch/s390/entry/syscalls/syscall.tbl arch/s390/kernel/syscalls/syscall.tbl
+check_2 tools/perf/arch/mips/entry/syscalls/syscall_n64.tbl arch/mips/kernel/syscalls/syscall_n64.tbl
 
 for i in $BEAUTY_FILES; do
   beauty_check $i -B

tools/perf/util/syscalltbl.c

@@ -34,6 +34,10 @@ static const char **syscalltbl_native = syscalltbl_powerpc_32;
 #include <asm/syscalls.c>
 const int syscalltbl_native_max_id = SYSCALLTBL_ARM64_MAX_ID;
 static const char **syscalltbl_native = syscalltbl_arm64;
+#elif defined(__mips__)
+#include <asm/syscalls_n64.c>
+const int syscalltbl_native_max_id = SYSCALLTBL_MIPS_N64_MAX_ID;
+static const char **syscalltbl_native = syscalltbl_mips_n64;
 #endif
 
 struct syscall {