Let ubpf invoke function calls. The function index is stored in
insns->imm, use it to fetch the corresponding functions in libbpf and
make the function call.
Signed-off-by: He Kuang <heku...@huawei.com>
---
tools/perf/util/bpf-vm.c | 24 ++++++++++++++++++++++--
1 file changed, 22 insertions(+), 2 deletions(-)
diff --git a/tools/perf/util/bpf-vm.c b/tools/perf/util/bpf-vm.c
index 191ed42..bbe58be 100644
--- a/tools/perf/util/bpf-vm.c
+++ b/tools/perf/util/bpf-vm.c
@@ -4,13 +4,33 @@
#include "bpf-vm.h"
#include "debug.h"
#include <linux/filter.h>
+#include "bpf/libbpf.h"
+#include <linux/bpf.h>
+
+#define BPF_R0 regs[BPF_REG_0]
+#define BPF_R1 regs[BPF_REG_1]
+#define BPF_R2 regs[BPF_REG_2]
+#define BPF_R3 regs[BPF_REG_3]
+#define BPF_R4 regs[BPF_REG_4]
+#define BPF_R5 regs[BPF_REG_5]
#define DST regs[insn->dst_reg]
#define SRC regs[insn->src_reg]
static inline void
-bpf_vm_jmp_call_handler(u64 *regs __maybe_unused, void *ctx __maybe_unused,
- const struct bpf_insn *insn __maybe_unused) {}
+bpf_vm_jmp_call_handler(u64 *regs, void *ctx __maybe_unused,
+ const struct bpf_insn *insn)
+{
+ const void *xfunc;
+ u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
+
+ xfunc = libbpf_get_ubpf_func(insn->imm);
+ if (xfunc) {
+ func = xfunc;
+ BPF_R0 = func(BPF_R1, BPF_R2, BPF_R3,
+ BPF_R4, BPF_R5);
+ }
+}
static inline int
bpf_vm_jmp_tail_call_handler(u64 *regs __maybe_unused,
--
1.8.5.2
