petrbalvin
2ab6b9eb84
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91 lines
1.9 KiB
Go
91 lines
1.9 KiB
Go
// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
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// SPDX-License-Identifier: BSD-3-Clause
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package debug
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// Regs holds the full general-purpose register set of a traced process
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// (the Linux amd64 user_regs_struct layout).
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type Regs struct {
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R15 uint64
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R14 uint64
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R13 uint64
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R12 uint64
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RBP uint64
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RBX uint64
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R11 uint64
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R10 uint64
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R9 uint64
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R8 uint64
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RAX uint64
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RCX uint64
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RDX uint64
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RSI uint64
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RDI uint64
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OrigRAX uint64
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RIP uint64
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CS uint64
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RFLAGS uint64
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RSP uint64
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SS uint64
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FSBase uint64
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GSBase uint64
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DS uint64
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ES uint64
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FS uint64
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GS uint64
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}
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// tracer abstracts the minimal ptrace operations needed by the breakpoint
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// manager and the stop-information helpers. The live implementation is
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// *Session (ptrace_linux_amd64.go); tests supply a mock.
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type tracer interface {
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Peek(addr uint64) (uint64, error)
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Poke(addr uint64, val uint64) error
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SetRegs(regs *Regs) error
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Pid() int
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}
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// mockTracer records Peek/Poke calls and provides fake register state.
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type mockTracer struct {
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mem map[uint64]byte
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peeks []uint64
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pokes []struct {
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addr uint64
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val uint64
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}
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regs *Regs
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}
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func newMockTracer() *mockTracer {
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return &mockTracer{
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mem: make(map[uint64]byte),
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regs: &Regs{},
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}
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}
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func (m *mockTracer) Peek(addr uint64) (uint64, error) {
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m.peeks = append(m.peeks, addr)
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var val uint64
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for i := uint64(0); i < 8; i++ {
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val |= uint64(m.mem[addr+i]) << (i * 8)
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}
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return val, nil
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}
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func (m *mockTracer) Poke(addr uint64, val uint64) error {
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m.pokes = append(m.pokes, struct {
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addr uint64
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val uint64
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}{addr, val})
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for i := uint64(0); i < 8; i++ {
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m.mem[addr+i] = byte(val >> (i * 8))
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}
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return nil
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}
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func (m *mockTracer) SetRegs(regs *Regs) error {
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m.regs = regs
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return nil
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}
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func (m *mockTracer) Pid() int { return 42 }
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