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-rw-r--r--tools/perf/arch/x86/util/machine.c105
1 files changed, 105 insertions, 0 deletions
diff --git a/tools/perf/arch/x86/util/machine.c b/tools/perf/arch/x86/util/machine.c
new file mode 100644
index 000000000..31679c35d
--- /dev/null
+++ b/tools/perf/arch/x86/util/machine.c
@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/types.h>
+#include <linux/string.h>
+#include <limits.h>
+#include <stdlib.h>
+
+#include <internal/lib.h> // page_size
+#include "../../../util/machine.h"
+#include "../../../util/map.h"
+#include "../../../util/symbol.h"
+#include <linux/ctype.h>
+
+#include <symbol/kallsyms.h>
+
+#if defined(__x86_64__)
+
+struct extra_kernel_map_info {
+ int cnt;
+ int max_cnt;
+ struct extra_kernel_map *maps;
+ bool get_entry_trampolines;
+ u64 entry_trampoline;
+};
+
+static int add_extra_kernel_map(struct extra_kernel_map_info *mi, u64 start,
+ u64 end, u64 pgoff, const char *name)
+{
+ if (mi->cnt >= mi->max_cnt) {
+ void *buf;
+ size_t sz;
+
+ mi->max_cnt = mi->max_cnt ? mi->max_cnt * 2 : 32;
+ sz = sizeof(struct extra_kernel_map) * mi->max_cnt;
+ buf = realloc(mi->maps, sz);
+ if (!buf)
+ return -1;
+ mi->maps = buf;
+ }
+
+ mi->maps[mi->cnt].start = start;
+ mi->maps[mi->cnt].end = end;
+ mi->maps[mi->cnt].pgoff = pgoff;
+ strlcpy(mi->maps[mi->cnt].name, name, KMAP_NAME_LEN);
+
+ mi->cnt += 1;
+
+ return 0;
+}
+
+static int find_extra_kernel_maps(void *arg, const char *name, char type,
+ u64 start)
+{
+ struct extra_kernel_map_info *mi = arg;
+
+ if (!mi->entry_trampoline && kallsyms2elf_binding(type) == STB_GLOBAL &&
+ !strcmp(name, "_entry_trampoline")) {
+ mi->entry_trampoline = start;
+ return 0;
+ }
+
+ if (is_entry_trampoline(name)) {
+ u64 end = start + page_size;
+
+ return add_extra_kernel_map(mi, start, end, 0, name);
+ }
+
+ return 0;
+}
+
+int machine__create_extra_kernel_maps(struct machine *machine,
+ struct dso *kernel)
+{
+ struct extra_kernel_map_info mi = { .cnt = 0, };
+ char filename[PATH_MAX];
+ int ret;
+ int i;
+
+ machine__get_kallsyms_filename(machine, filename, PATH_MAX);
+
+ if (symbol__restricted_filename(filename, "/proc/kallsyms"))
+ return 0;
+
+ ret = kallsyms__parse(filename, &mi, find_extra_kernel_maps);
+ if (ret)
+ goto out_free;
+
+ if (!mi.entry_trampoline)
+ goto out_free;
+
+ for (i = 0; i < mi.cnt; i++) {
+ struct extra_kernel_map *xm = &mi.maps[i];
+
+ xm->pgoff = mi.entry_trampoline;
+ ret = machine__create_extra_kernel_map(machine, kernel, xm);
+ if (ret)
+ goto out_free;
+ }
+
+ machine->trampolines_mapped = mi.cnt;
+out_free:
+ free(mi.maps);
+ return ret;
+}
+
+#endif