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| author | Alexei Starovoitov <alexei.starovoitov@gmail.com> | 2017-05-03 17:30:56 +0000 |
|---|---|---|
| committer | Alexei Starovoitov <alexei.starovoitov@gmail.com> | 2017-05-03 17:30:56 +0000 |
| commit | bd87726db47eb83032b456d062e936bfc3b3bcaa (patch) | |
| tree | 3ec7d9bd3d27c49f884339696ee574da7df1b59d /test/CodeGen/BPF | |
| parent | 450661e57cad87418f3876dff38fbb4dcbc75569 (diff) | |
[bpf] add relocation support
. there should be no runtime relocation inside the bpf function.
. relocation supported here mostly for debugging.
. a test case is added.
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@302055 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/BPF')
| -rw-r--r-- | test/CodeGen/BPF/reloc.ll | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/test/CodeGen/BPF/reloc.ll b/test/CodeGen/BPF/reloc.ll new file mode 100644 index 00000000000..75dbebf311e --- /dev/null +++ b/test/CodeGen/BPF/reloc.ll @@ -0,0 +1,43 @@ +; RUN: llc -march=bpfel -filetype=obj < %s | llvm-objdump -r - | FileCheck --check-prefix=CHECK-RELOC %s + +%struct.bpf_context = type { i64, i64, i64, i64, i64, i64, i64 } +%struct.sk_buff = type { i64, i64, i64, i64, i64, i64, i64 } +%struct.net_device = type { i64, i64, i64, i64, i64, i64, i64 } + +@bpf_prog1.devname = private unnamed_addr constant [3 x i8] c"lo\00", align 1 +@bpf_prog1.fmt = private unnamed_addr constant [15 x i8] c"skb %x dev %x\0A\00", align 1 + +; Function Attrs: norecurse +define i32 @bpf_prog1(%struct.bpf_context* nocapture %ctx) #0 section "events/net/netif_receive_skb" { + %devname = alloca [3 x i8], align 1 + %fmt = alloca [15 x i8], align 1 + %1 = getelementptr inbounds [3 x i8], [3 x i8]* %devname, i64 0, i64 0 + call void @llvm.memcpy.p0i8.p0i8.i64(i8* %1, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @bpf_prog1.devname, i64 0, i64 0), i64 3, i32 1, i1 false) + %2 = getelementptr inbounds %struct.bpf_context, %struct.bpf_context* %ctx, i64 0, i32 0 + %3 = load i64, i64* %2, align 8 + %4 = inttoptr i64 %3 to %struct.sk_buff* + %5 = getelementptr inbounds %struct.sk_buff, %struct.sk_buff* %4, i64 0, i32 2 + %6 = bitcast i64* %5 to i8* + %7 = call i8* inttoptr (i64 4 to i8* (i8*)*)(i8* %6) #1 + %8 = call i32 inttoptr (i64 9 to i32 (i8*, i8*, i32)*)(i8* %7, i8* %1, i32 2) #1 + %9 = icmp eq i32 %8, 0 + br i1 %9, label %10, label %13 + +; <label>:10 ; preds = %0 + %11 = getelementptr inbounds [15 x i8], [15 x i8]* %fmt, i64 0, i64 0 + call void @llvm.memcpy.p0i8.p0i8.i64(i8* %11, i8* getelementptr inbounds ([15 x i8], [15 x i8]* @bpf_prog1.fmt, i64 0, i64 0), i64 15, i32 1, i1 false) + %12 = call i32 (i8*, i32, ...) inttoptr (i64 11 to i32 (i8*, i32, ...)*)(i8* %11, i32 15, %struct.sk_buff* %4, i8* %7) #1 + br label %13 + +; <label>:13 ; preds = %10, %0 + ret i32 0 + +; CHECK-RELOC: file format ELF64-BPF +; CHECK-RELOC: RELOCATION RECORDS FOR [.rel.eh_frame]: +; CHECK-RELOC: R_BPF_64_64 events/net/netif_receive_skb +} + +; Function Attrs: nounwind +declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) #1 + +attributes #0 = { norecurse } |