perf tools: Allow generating per-arch syscall table arrays

Tools should use a mechanism similar to arch/x86/entry/syscalls/ to
generate a header file with the definitions for two variables:

  static const char *syscalltbl_x86_64[] = {
	[0] = "read",
	[1] = "write",
  <SNIP>
	[324] = "membarrier",
	[325] = "mlock2",
	[326] = "copy_file_range",
  };
  static const int syscalltbl_x86_64_max_id = 326;

In a per arch file that should then be included in
tools/perf/util/syscalltbl.c.

First one will be for x86_64.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-02uuamkxgccczdth8komspgp@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 87 insertions, 2 deletions

diff --git a/tools/perf/util/syscalltbl.c b/tools/perf/util/syscalltbl.c
index 1f13e57412eb..eb74a97b1f11 100644
--- a/tools/perf/util/syscalltbl.c
+++ b/tools/perf/util/syscalltbl.c
@@ -14,21 +14,105 @@
  */
 
 #include "syscalltbl.h"
+#include <stdlib.h>
+
+#ifdef HAVE_SYSCALL_TABLE
+#include <linux/compiler.h>
 #include <string.h>
-#include <libaudit.h>
+#include "util.h"
+
+struct syscall {
+        int id;
+        const char *name;
+};
 
+static int syscallcmpname(const void *vkey, const void *ventry)
+{
+        const char *key = vkey;
+        const struct syscall *entry = ventry;
+
+        return strcmp(key, entry->name);
+}
+
+static int syscallcmp(const void *va, const void *vb)
+{
+        const struct syscall *a = va, *b = vb;
+
+        return strcmp(a->name, b->name);
+}
+
+static int syscalltbl__init_native(struct syscalltbl *tbl)
+{
+        int nr_entries = 0, i, j;
+        struct syscall *entries;
+
+        for (i = 0; i <= syscalltbl_native_max_id; ++i)
+                if (syscalltbl_native[i])
+                        ++nr_entries;
+
+        entries = tbl->syscalls.entries = malloc(sizeof(struct syscall) * nr_entries);
+        if (tbl->syscalls.entries == NULL)
+                return -1;
+
+        for (i = 0, j = 0; i <= syscalltbl_native_max_id; ++i) {
+                if (syscalltbl_native[i]) {
+                        entries[j].name = syscalltbl_native[i];
+                        entries[j].id = i;
+                        ++j;
+                }
+        }
+
+        qsort(tbl->syscalls.entries, nr_entries, sizeof(struct syscall), syscallcmp);
+        tbl->syscalls.nr_entries = nr_entries;
+        return 0;
+}
 
 struct syscalltbl *syscalltbl__new(void)
 {
         struct syscalltbl *tbl = malloc(sizeof(*tbl));
         if (tbl) {
-                tbl->audit_machine = audit_detect_machine();
+                if (syscalltbl__init_native(tbl)) {
+                        free(tbl);
+                        return NULL;
+                }
         }
         return tbl;
 }
 
 void syscalltbl__delete(struct syscalltbl *tbl)
 {
+        zfree(&tbl->syscalls.entries);
+        free(tbl);
+}
+
+const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id)
+{
+        return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL;
+}
+
+int syscalltbl__id(struct syscalltbl *tbl, const char *name)
+{
+        struct syscall *sc = bsearch(name, tbl->syscalls.entries,
+                                     tbl->syscalls.nr_entries, sizeof(*sc),
+                                     syscallcmpname);
+
+        return sc ? sc->id : -1;
+}
+
+#else /* HAVE_SYSCALL_TABLE */
+
+#include <libaudit.h>
+
+struct syscalltbl *syscalltbl__new(void)
+{
+        struct syscalltbl *tbl = malloc(sizeof(*tbl));
+        if (tbl)
+                tbl->audit_machine = audit_detect_machine();
+        return tbl;
+}
+
+void syscalltbl__delete(struct syscalltbl *tbl)
+{
         free(tbl);
 }
 
@@ -41,3 +125,4 @@ int syscalltbl__id(struct syscalltbl *tbl, const char *name)
 {
         return audit_name_to_syscall(name, tbl->audit_machine);
 }
+#endif /* HAVE_SYSCALL_TABLE */