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[bpf] add support for bpf pseudo instruction

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Expose bpf pseudo load instruction via intrinsic. It is used by front-ends that
can encode file descriptors directly into IR instead of relying on relocations.

llvm-svn: 233396
This commit is contained in:
Alexei Starovoitov 2015-03-27 18:51:42 +00:00
parent fa5e8e64e6
commit bcf6ba62a2
4 changed files with 40 additions and 2 deletions
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2
include/llvm/IR/IntrinsicsBPF.td
View File

@ -19,4 +19,6 @@ let TargetPrefix = "bpf" in { // All intrinsics start with "llvm.bpf."
Intrinsic<[llvm_i64_ty], [llvm_ptr_ty, llvm_i64_ty], [IntrReadMem]>;
def int_bpf_load_word : GCCBuiltin<"__builtin_bpf_load_word">,
Intrinsic<[llvm_i64_ty], [llvm_ptr_ty, llvm_i64_ty], [IntrReadMem]>;
def int_bpf_pseudo : GCCBuiltin<"__builtin_bpf_pseudo">,
Intrinsic<[llvm_i64_ty], [llvm_i64_ty, llvm_i64_ty]>;
}

23
lib/Target/BPF/BPFInstrInfo.td
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@ -257,6 +257,29 @@ class LD_IMM64<bits<4> Pseudo, string OpcodeStr>
}
def LD_imm64 : LD_IMM64<0, "ld_64">;
def LD_pseudo
: InstBPF<(outs GPR:$dst), (ins i64imm:$pseudo, u64imm:$imm),
"ld_pseudo\t$dst, $pseudo, $imm",
[(set GPR:$dst, (int_bpf_pseudo imm:$pseudo, imm:$imm))]> {
bits<3> mode;
bits<2> size;
bits<4> dst;
bits<64> imm;
bits<4> pseudo;
let Inst{63-61} = mode;
let Inst{60-59} = size;
let Inst{51-48} = dst;
let Inst{55-52} = pseudo;
let Inst{47-32} = 0;
let Inst{31-0} = imm{31-0};
let mode = 0; // BPF_IMM
let size = 3; // BPF_DW
let BPFClass = 0; // BPF_LD
}
// STORE instructions
class STORE<bits<2> SizeOp, string OpcodeStr, list<dag> Pattern>
: InstBPF<(outs), (ins GPR:$src, MEMri:$addr),

2
lib/Target/BPF/MCTargetDesc/BPFMCCodeEmitter.cpp
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@ -125,7 +125,7 @@ void BPFMCCodeEmitter::EncodeInstruction(const MCInst &MI, raw_ostream &OS,
// Keep track of the current byte being emitted
unsigned CurByte = 0;
if (Opcode == BPF::LD_imm64) {
if (Opcode == BPF::LD_imm64 || Opcode == BPF::LD_pseudo) {
uint64_t Value = getBinaryCodeForInstr(MI, Fixups, STI);
EmitByte(Value >> 56, CurByte, OS);
EmitByte(((Value >> 48) & 0xff), CurByte, OS);

15
test/CodeGen/BPF/intrinsics.ll
View File

@ -1,4 +1,4 @@
; RUN: llc < %s -march=bpf | FileCheck %s
; RUN: llc < %s -march=bpf -show-mc-encoding | FileCheck %s
; Function Attrs: nounwind uwtable
define i32 @ld_b(i64 %foo, i64* nocapture %bar, i8* %ctx, i8* %ctx2) #0 {
@ -48,3 +48,16 @@ define i32 @ld_w(i8* %ctx, i8* %ctx2, i32 %foo) #0 {
}
declare i64 @llvm.bpf.load.word(i8*, i64) #1
define i32 @ld_pseudo() #0 {
entry:
%call = tail call i64 @llvm.bpf.pseudo(i64 2, i64 3)
tail call void @bar(i64 %call, i32 4) #2
ret i32 0
; CHECK-LABEL: ld_pseudo:
; CHECK: ld_pseudo r1, 2, 3 # encoding: [0x18,0x21,0x00,0x00,0x03,0x00
}
declare void @bar(i64, i32) #1
declare i64 @llvm.bpf.pseudo(i64, i64) #2