perf LoongArch: Simplify mksyscalltbl

In order to print the numerical entries of the syscall table,
there is no need to call the host compiler to build and then
run a program, this can be done directly by the shell script.

This is similar with commit 9854e7ad35fe ("perf arm64: Simplify
mksyscalltbl"). For now, the mksyscalltbl file of LoongArch is
almost same with arm64.

Reviewed-by: Huacai Chen <chenhuacai@loongson.cn>
Reviewed-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: loongarch@lists.linux.dev
Link: https://lore.kernel.org/r/1685441401-8709-6-git-send-email-yangtiezhu@loongson.cn
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/arch/loongarch/entry/syscalls/mksyscalltbl b/tools/perf/arch/loongarch/entry/syscalls/mksyscalltbl
index 5fb83bd..c10ad35 100755 (executable)
--- a/tools/perf/arch/loongarch/entry/syscalls/mksyscalltbl
+++ b/tools/perf/arch/loongarch/entry/syscalls/mksyscalltbl
@@ -18,44 +18,28 @@ if ! test -r $input; then
        exit 1
 fi
 
-create_table_from_c()
+create_sc_table()
 {
-       local sc nr last_sc
-
-       create_table_exe=`mktemp ${TMPDIR:-/tmp}/create-table-XXXXXX`
-
-       {
-
-       cat <<-_EoHEADER
-               #include <stdio.h>
-               #include "$input"
-               int main(int argc, char *argv[])
-               {
-       _EoHEADER
+       local sc nr max_nr
 
        while read sc nr; do
-               printf "%s\n" " printf(\"\\t[%d] = \\\"$sc\\\",\\n\", $nr);"
-               last_sc=$nr
+               printf "%s\n" " [$nr] = \"$sc\","
+               max_nr=$nr
        done
 
-       printf "%s\n" " printf(\"#define SYSCALLTBL_LOONGARCH_MAX_ID %d\\n\", $last_sc);"
-       printf "}\n"
-
-       } | $hostcc -I $incpath/include/uapi -o $create_table_exe -x c -
-
-       $create_table_exe
-
-       rm -f $create_table_exe
+       echo "#define SYSCALLTBL_LOONGARCH_MAX_ID $max_nr"
 }
 
 create_table()
 {
+       echo "#include \"$input\""
        echo "static const char *const syscalltbl_loongarch[] = {"
-       create_table_from_c
+       create_sc_table
        echo "};"
 }
 
-$gcc -E -dM -x c  -I $incpath/include/uapi $input             \
-       |sed -ne 's/^#define __NR_//p' \
-       |sort -t' ' -k2 -n \
+$gcc -E -dM -x c -I $incpath/include/uapi $input \
+       |awk '$2 ~ "__NR" && $3 !~ "__NR3264_" {
+               sub("^#define __NR(3264)?_", "");
+               print | "sort -k2 -n"}' \
        |create_table