140 lines
2.9 KiB
Go
140 lines
2.9 KiB
Go
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// 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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//go:build freebsd && arm64
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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 FreeBSD arm64 struct reg layout, sys/arm64/include/reg.h: x[30], lr,
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// sp, elr, spsr).
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type Regs struct {
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X0 uint64
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X1 uint64
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X2 uint64
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X3 uint64
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X4 uint64
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X5 uint64
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X6 uint64
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X7 uint64
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X8 uint64
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X9 uint64
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X10 uint64
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X11 uint64
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X12 uint64
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X13 uint64
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X14 uint64
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X15 uint64
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X16 uint64
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X17 uint64
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X18 uint64
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X19 uint64
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X20 uint64
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X21 uint64
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X22 uint64
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X23 uint64
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X24 uint64
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X25 uint64
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X26 uint64
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X27 uint64
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X28 uint64
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X29 uint64 // FP (frame pointer)
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X30 uint64 // LR (link register)
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SP uint64
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PC uint64
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PSTATE uint64
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}
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// GetPC returns the program counter.
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func (r *Regs) GetPC() uint64 { return r.PC }
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// SetPC sets the program counter.
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func (r *Regs) SetPC(pc uint64) { r.PC = pc }
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// GetSP returns the stack pointer.
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func (r *Regs) GetSP() uint64 { return r.SP }
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// RegValue returns the value of the named register, or false if unknown.
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func (r *Regs) RegValue(name string) (uint64, bool) {
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switch name {
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case "x0":
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return r.X0, true
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case "x1":
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return r.X1, true
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case "x2":
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return r.X2, true
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case "x3":
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return r.X3, true
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case "x4":
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return r.X4, true
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case "x5":
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return r.X5, true
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case "x6":
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return r.X6, true
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case "x7":
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return r.X7, true
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case "x8":
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return r.X8, true
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case "x9":
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return r.X9, true
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case "x10":
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return r.X10, true
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case "x11":
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return r.X11, true
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case "x12":
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return r.X12, true
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case "x13":
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return r.X13, true
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case "x14":
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return r.X14, true
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case "x15":
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return r.X15, true
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case "x16":
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return r.X16, true
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case "x17":
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return r.X17, true
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case "x18":
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return r.X18, true
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case "x19":
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return r.X19, true
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case "x20":
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return r.X20, true
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case "x21":
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return r.X21, true
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case "x22":
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return r.X22, true
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case "x23":
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return r.X23, true
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case "x24":
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return r.X24, true
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case "x25":
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return r.X25, true
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case "x26":
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return r.X26, true
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case "x27":
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return r.X27, true
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case "x28":
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return r.X28, true
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case "x29", "fp":
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return r.X29, true
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case "x30", "lr":
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return r.X30, true
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case "sp":
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return r.SP, true
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case "pc":
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return r.PC, true
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default:
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return 0, false
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}
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}
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// breakpointInsn is the software breakpoint instruction (BRK #0).
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var breakpointInsn = []byte{0x00, 0x00, 0x20, 0xD4} // BRK #0
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// breakpointPCAdjust is how far PC is past the breakpoint instruction after
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// a trap: 0. The BRK synchronous exception leaves ELR_EL0 on the BRK
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// itself (ARM DDI 0487), and the FreeBSD EXCP_BRKPT_EL0 handler delivers
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// the frame's elr unmodified (sys/arm64/arm64/trap.c), so the trap address
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// is the PC as reported.
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const breakpointPCAdjust = 0
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