Messages in this thread Patch in this message | | | From | He Kuang <> | Subject | [RFC PATCH v2 24/26] perf bpf: Fillup bpf jmp_call handler | Date | Sun, 26 Jun 2016 11:21:16 +0000 |
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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 <hekuang@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
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