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package ebpf
import (
"errors"
"testing"
"github.com/cilium/ebpf/asm"
"github.com/cilium/ebpf/btf"
"github.com/cilium/ebpf/internal"
"github.com/cilium/ebpf/internal/testutils"
"github.com/go-quicktest/qt"
)
func TestFindReferences(t *testing.T) {
progs := map[string]*ProgramSpec{
"entrypoint": {
Type: SocketFilter,
Instructions: asm.Instructions{
// Make sure the call doesn't happen at instruction 0
// to exercise the relative offset calculation.
asm.Mov.Reg(asm.R0, asm.R1),
asm.Call.Label("my_func"),
asm.Return(),
},
License: "MIT",
},
"my_other_func": {
Instructions: asm.Instructions{
asm.LoadImm(asm.R0, 1337, asm.DWord).WithSymbol("my_other_func"),
asm.Return(),
},
},
"my_func": {
Instructions: asm.Instructions{
asm.Call.Label("my_other_func").WithSymbol("my_func"),
asm.Return(),
},
},
}
flattenPrograms(progs, []string{"entrypoint"})
prog, err := NewProgram(progs["entrypoint"])
testutils.SkipIfNotSupported(t, err)
if err != nil {
t.Fatal(err)
}
defer prog.Close()
ret, _, err := prog.Test(internal.EmptyBPFContext)
if err != nil {
t.Fatal(err)
}
if ret != 1337 {
t.Errorf("Expected return code 1337, got %d", ret)
}
}
func TestForwardFunctionDeclaration(t *testing.T) {
file := testutils.NativeFile(t, "testdata/fwd_decl-%s.elf")
coll, err := LoadCollectionSpec(file)
if err != nil {
t.Fatal(err)
}
spec := coll.Programs["call_fwd"]
// This program calls an unimplemented forward function declaration.
_, err = NewProgram(spec)
if !errors.Is(err, asm.ErrUnsatisfiedProgramReference) {
t.Fatal("Expected an error wrapping ErrUnsatisfiedProgramReference, got:", err)
}
// Append the implementation of fwd().
spec.Instructions = append(spec.Instructions,
asm.Mov.Imm32(asm.R0, 23).WithSymbol("fwd"),
asm.Return(),
)
// The body of the subprog we appended does not come with BTF func_infos,
// so the verifier will reject it. Load without BTF.
for i, ins := range spec.Instructions {
if btf.FuncMetadata(&ins) != nil || ins.Source() != nil {
sym := ins.Symbol()
ref := ins.Reference()
ins.Metadata = asm.Metadata{}
spec.Instructions[i] = ins.WithSymbol(sym).WithReference(ref)
}
}
prog, err := NewProgram(spec)
testutils.SkipIfNotSupported(t, err)
if err != nil {
t.Fatalf("%+v", err)
}
defer prog.Close()
ret, _, err := prog.Test(internal.EmptyBPFContext)
if err != nil {
t.Fatal("Running program:", err)
}
if ret != 23 {
t.Fatalf("Expected 23, got %d", ret)
}
}
func TestSplitSymbols(t *testing.T) {
// Splitting an empty insns results in an error.
_, err := splitSymbols(asm.Instructions{})
qt.Assert(t, qt.IsNotNil(err), qt.Commentf("empty insns"))
// Splitting non-empty insns without a leading Symbol is an error.
_, err = splitSymbols(asm.Instructions{
asm.Return(),
})
qt.Assert(t, qt.IsNotNil(err), qt.Commentf("insns without leading Symbol"))
// Non-empty insns with a single Instruction that is a Symbol.
insns := asm.Instructions{
asm.Return().WithSymbol("sym"),
}
m, err := splitSymbols(insns)
qt.Assert(t, qt.IsNil(err), qt.Commentf("insns with a single Symbol"))
qt.Assert(t, qt.HasLen(m, 1))
qt.Assert(t, qt.HasLen(m["sym"], 1))
// Insns containing duplicate Symbols.
_, err = splitSymbols(asm.Instructions{
asm.Return().WithSymbol("sym"),
asm.Return().WithSymbol("sym"),
})
qt.Assert(t, qt.IsNotNil(err), qt.Commentf("insns containing duplicate Symbols"))
// Insns with multiple Symbols and subprogs of various lengths.
m, err = splitSymbols(asm.Instructions{
asm.Return().WithSymbol("sym1"),
asm.Mov.Imm(asm.R0, 0).WithSymbol("sym2"),
asm.Return(),
asm.Mov.Imm(asm.R0, 0).WithSymbol("sym3"),
asm.Mov.Imm(asm.R0, 1),
asm.Return(),
asm.Mov.Imm(asm.R0, 0).WithSymbol("sym4"),
asm.Mov.Imm(asm.R0, 1),
asm.Mov.Imm(asm.R0, 2),
asm.Return(),
})
qt.Assert(t, qt.IsNil(err), qt.Commentf("insns with multiple Symbols"))
qt.Assert(t, qt.HasLen(m, 4))
qt.Assert(t, qt.HasLen(m["sym1"], 1))
qt.Assert(t, qt.HasLen(m["sym2"], 2))
qt.Assert(t, qt.HasLen(m["sym3"], 3))
qt.Assert(t, qt.HasLen(m["sym4"], 4))
}
func TestFlattenInstructionsAllocations(t *testing.T) {
name := "entrypoint"
instructions := asm.Instructions{
asm.LoadImm(asm.R0, 0, asm.DWord),
asm.Return(),
}
prog := &ProgramSpec{
Name: name,
Instructions: instructions,
}
progs := map[string]*ProgramSpec{name: prog}
refs := make(map[*ProgramSpec][]string)
// ensure that flattenInstructions does not allocate memory
// if there is no reference for the given program.
allocs := testing.AllocsPerRun(5, func() {
_ = flattenInstructions(name, progs, refs)
})
qt.Assert(t, qt.Equals(allocs, float64(0)))
}
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