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[bpf-next,v4,05/16] tools: bpftool: teach cfg code about JMP32

Message ID 1548523574-18316-6-git-send-email-jiong.wang@netronome.com
State Accepted
Delegated to: BPF Maintainers
Headers show
Series bpf: propose new jmp32 instructions | expand

Commit Message

Jiong Wang Jan. 26, 2019, 5:26 p.m. UTC 
The cfg code need to be aware of the new JMP32 instruction class so it
could partition functions correctly.

Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Jiong Wang <jiong.wang@netronome.com>
---
 tools/bpf/bpftool/cfg.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)
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Patch

diff --git a/tools/bpf/bpftool/cfg.c b/tools/bpf/bpftool/cfg.c
index 31f0db4..3e21f99 100644
--- a/tools/bpf/bpftool/cfg.c
+++ b/tools/bpf/bpftool/cfg.c
@@ -157,6 +157,11 @@  static bool cfg_partition_funcs(struct cfg *cfg, struct bpf_insn *cur,
 	return false;
 }
 
+static bool is_jmp_insn(u8 code)
+{
+	return BPF_CLASS(code) == BPF_JMP || BPF_CLASS(code) == BPF_JMP32;
+}
+
 static bool func_partition_bb_head(struct func_node *func)
 {
 	struct bpf_insn *cur, *end;
@@ -170,7 +175,7 @@  static bool func_partition_bb_head(struct func_node *func)
 		return true;
 
 	for (; cur <= end; cur++) {
-		if (BPF_CLASS(cur->code) == BPF_JMP) {
+		if (is_jmp_insn(cur->code)) {
 			u8 opcode = BPF_OP(cur->code);
 
 			if (opcode == BPF_EXIT || opcode == BPF_CALL)
@@ -296,7 +301,7 @@  static bool func_add_bb_edges(struct func_node *func)
 		e->src = bb;
 
 		insn = bb->tail;
-		if (BPF_CLASS(insn->code) != BPF_JMP ||
+		if (!is_jmp_insn(insn->code) ||
 		    BPF_OP(insn->code) == BPF_EXIT) {
 			e->dst = bb_next(bb);
 			e->flags |= EDGE_FLAG_FALLTHROUGH;