tools/perf: Add basic support for LoongArch

Add basic support for LoongArch, which is very similar to the MIPS
version.

Signed-off-by: Ming Wang <wangming01@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

1 files changed, 45 insertions, 0 deletions

diff --git a/tools/perf/arch/loongarch/annotate/instructions.c b/tools/perf/arch/loongarch/annotate/instructions.c
new file mode 100644
index 000000000000..ab21bf122135
--- /dev/null
+++ b/tools/perf/arch/loongarch/annotate/instructions.c
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Perf annotate functions.
+ *
+ * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
+ */
+
+static
+struct ins_ops *loongarch__associate_ins_ops(struct arch *arch, const char *name)
+{
+	struct ins_ops *ops = NULL;
+
+	if (!strncmp(name, "beqz", 4) ||
+	    !strncmp(name, "bnez", 4) ||
+	    !strncmp(name, "beq", 3) ||
+	    !strncmp(name, "bne", 3) ||
+	    !strncmp(name, "blt", 3) ||
+	    !strncmp(name, "bge", 3) ||
+	    !strncmp(name, "bltu", 4) ||
+	    !strncmp(name, "bgeu", 4) ||
+	    !strncmp(name, "bl", 2))
+		ops = &call_ops;
+	else if (!strncmp(name, "jirl", 4))
+		ops = &ret_ops;
+	else if (name[0] == 'b')
+		ops = &jump_ops;
+	else
+		return NULL;
+
+	arch__associate_ins_ops(arch, name, ops);
+
+	return ops;
+}
+
+static
+int loongarch__annotate_init(struct arch *arch, char *cpuid __maybe_unused)
+{
+	if (!arch->initialized) {
+		arch->associate_instruction_ops = loongarch__associate_ins_ops;
+		arch->initialized = true;
+		arch->objdump.comment_char = '#';
+	}
+
+	return 0;
+}