1 files changed, 0 insertions, 238 deletions
diff --git a/vendor/github.com/cilium/ebpf/linker.go b/vendor/github.com/cilium/ebpf/linker.go
deleted file mode 100644
index e6276b182..000000000
--- a/vendor/github.com/cilium/ebpf/linker.go
+++ /dev/null
@@ -1,238 +0,0 @@
-package ebpf
-
-import (
-	"errors"
-	"fmt"
-	"sync"
-
-	"github.com/cilium/ebpf/asm"
-	"github.com/cilium/ebpf/btf"
-)
-
-// splitSymbols splits insns into subsections delimited by Symbol Instructions.
-// insns cannot be empty and must start with a Symbol Instruction.
-//
-// The resulting map is indexed by Symbol name.
-func splitSymbols(insns asm.Instructions) (map[string]asm.Instructions, error) {
-	if len(insns) == 0 {
-		return nil, errors.New("insns is empty")
-	}
-
-	if insns[0].Symbol() == "" {
-		return nil, errors.New("insns must start with a Symbol")
-	}
-
-	var name string
-	progs := make(map[string]asm.Instructions)
-	for _, ins := range insns {
-		if sym := ins.Symbol(); sym != "" {
-			if progs[sym] != nil {
-				return nil, fmt.Errorf("insns contains duplicate Symbol %s", sym)
-			}
-			name = sym
-		}
-
-		progs[name] = append(progs[name], ins)
-	}
-
-	return progs, nil
-}
-
-// The linker is responsible for resolving bpf-to-bpf calls between programs
-// within an ELF. Each BPF program must be a self-contained binary blob,
-// so when an instruction in one ELF program section wants to jump to
-// a function in another, the linker needs to pull in the bytecode
-// (and BTF info) of the target function and concatenate the instruction
-// streams.
-//
-// Later on in the pipeline, all call sites are fixed up with relative jumps
-// within this newly-created instruction stream to then finally hand off to
-// the kernel with BPF_PROG_LOAD.
-//
-// Each function is denoted by an ELF symbol and the compiler takes care of
-// register setup before each jump instruction.
-
-// hasFunctionReferences returns true if insns contains one or more bpf2bpf
-// function references.
-func hasFunctionReferences(insns asm.Instructions) bool {
-	for _, i := range insns {
-		if i.IsFunctionReference() {
-			return true
-		}
-	}
-	return false
-}
-
-// applyRelocations collects and applies any CO-RE relocations in insns.
-//
-// Passing a nil target will relocate against the running kernel. insns are
-// modified in place.
-func applyRelocations(insns asm.Instructions, local, target *btf.Spec) error {
-	var relos []*btf.CORERelocation
-	var reloInsns []*asm.Instruction
-	iter := insns.Iterate()
-	for iter.Next() {
-		if relo := btf.CORERelocationMetadata(iter.Ins); relo != nil {
-			relos = append(relos, relo)
-			reloInsns = append(reloInsns, iter.Ins)
-		}
-	}
-
-	if len(relos) == 0 {
-		return nil
-	}
-
-	target, err := maybeLoadKernelBTF(target)
-	if err != nil {
-		return err
-	}
-
-	fixups, err := btf.CORERelocate(local, target, relos)
-	if err != nil {
-		return err
-	}
-
-	for i, fixup := range fixups {
-		if err := fixup.Apply(reloInsns[i]); err != nil {
-			return fmt.Errorf("apply fixup %s: %w", &fixup, err)
-		}
-	}
-
-	return nil
-}
-
-// flattenPrograms resolves bpf-to-bpf calls for a set of programs.
-//
-// Links all programs in names by modifying their ProgramSpec in progs.
-func flattenPrograms(progs map[string]*ProgramSpec, names []string) {
-	// Pre-calculate all function references.
-	refs := make(map[*ProgramSpec][]string)
-	for _, prog := range progs {
-		refs[prog] = prog.Instructions.FunctionReferences()
-	}
-
-	// Create a flattened instruction stream, but don't modify progs yet to
-	// avoid linking multiple times.
-	flattened := make([]asm.Instructions, 0, len(names))
-	for _, name := range names {
-		flattened = append(flattened, flattenInstructions(name, progs, refs))
-	}
-
-	// Finally, assign the flattened instructions.
-	for i, name := range names {
-		progs[name].Instructions = flattened[i]
-	}
-}
-
-// flattenInstructions resolves bpf-to-bpf calls for a single program.
-//
-// Flattens the instructions of prog by concatenating the instructions of all
-// direct and indirect dependencies.
-//
-// progs contains all referenceable programs, while refs contain the direct
-// dependencies of each program.
-func flattenInstructions(name string, progs map[string]*ProgramSpec, refs map[*ProgramSpec][]string) asm.Instructions {
-	prog := progs[name]
-
-	insns := make(asm.Instructions, len(prog.Instructions))
-	copy(insns, prog.Instructions)
-
-	// Add all direct references of prog to the list of to be linked programs.
-	pending := make([]string, len(refs[prog]))
-	copy(pending, refs[prog])
-
-	// All references for which we've appended instructions.
-	linked := make(map[string]bool)
-
-	// Iterate all pending references. We can't use a range since pending is
-	// modified in the body below.
-	for len(pending) > 0 {
-		var ref string
-		ref, pending = pending[0], pending[1:]
-
-		if linked[ref] {
-			// We've already linked this ref, don't append instructions again.
-			continue
-		}
-
-		progRef := progs[ref]
-		if progRef == nil {
-			// We don't have instructions that go with this reference. This
-			// happens when calling extern functions.
-			continue
-		}
-
-		insns = append(insns, progRef.Instructions...)
-		linked[ref] = true
-
-		// Make sure we link indirect references.
-		pending = append(pending, refs[progRef]...)
-	}
-
-	return insns
-}
-
-// fixupAndValidate is called by the ELF reader right before marshaling the
-// instruction stream. It performs last-minute adjustments to the program and
-// runs some sanity checks before sending it off to the kernel.
-func fixupAndValidate(insns asm.Instructions) error {
-	iter := insns.Iterate()
-	for iter.Next() {
-		ins := iter.Ins
-
-		// Map load was tagged with a Reference, but does not contain a Map pointer.
-		if ins.IsLoadFromMap() && ins.Reference() != "" && ins.Map() == nil {
-			return fmt.Errorf("instruction %d: map %s: %w", iter.Index, ins.Reference(), asm.ErrUnsatisfiedMapReference)
-		}
-
-		fixupProbeReadKernel(ins)
-	}
-
-	return nil
-}
-
-// fixupProbeReadKernel replaces calls to bpf_probe_read_{kernel,user}(_str)
-// with bpf_probe_read(_str) on kernels that don't support it yet.
-func fixupProbeReadKernel(ins *asm.Instruction) {
-	if !ins.IsBuiltinCall() {
-		return
-	}
-
-	// Kernel supports bpf_probe_read_kernel, nothing to do.
-	if haveProbeReadKernel() == nil {
-		return
-	}
-
-	switch asm.BuiltinFunc(ins.Constant) {
-	case asm.FnProbeReadKernel, asm.FnProbeReadUser:
-		ins.Constant = int64(asm.FnProbeRead)
-	case asm.FnProbeReadKernelStr, asm.FnProbeReadUserStr:
-		ins.Constant = int64(asm.FnProbeReadStr)
-	}
-}
-
-var kernelBTF struct {
-	sync.Mutex
-	spec *btf.Spec
-}
-
-// maybeLoadKernelBTF loads the current kernel's BTF if spec is nil, otherwise
-// it returns spec unchanged.
-//
-// The kernel BTF is cached for the lifetime of the process.
-func maybeLoadKernelBTF(spec *btf.Spec) (*btf.Spec, error) {
-	if spec != nil {
-		return spec, nil
-	}
-
-	kernelBTF.Lock()
-	defer kernelBTF.Unlock()
-
-	if kernelBTF.spec != nil {
-		return kernelBTF.spec, nil
-	}
-
-	var err error
-	kernelBTF.spec, err = btf.LoadKernelSpec()
-	return kernelBTF.spec, err
-}