// where we should unwind to.
	// id records the global inlining id of the inlined body.
	// p records the location of an instruction in the parent (inliner) frame.
	p  *Prog
	id int32
}

// Mark p as the instruction to set as the pc when
// "unwinding" the inlining global frame id. Usually it should be
// instruction with a file:line at the callsite, and occur
// just before the body of the inlined function.

	MOVD	m_g0(R7), R10		// g0 for m
	CMP	R10, g			// same g0?
	BEQ	call			// already on g0
	MOVD	(g_sched+gobuf_sp)(R10), R1 // switch R1
call:
	// prepare frame for C ABI
	SUB	$32, R1			// create frame for callee saving LR, CR, R2 etc.
	RLDCR   $0, R1, $~15, R1	// align SP to 16 bytes
	MOVD	R8, CTR			// R8 = caller addr
	MOVD	R8, R12			// expected by PPC64 ABI
	BL	(CTR)

}

// A ScopeID represents a lexical scope within a function.
type ScopeID int32

const (
	funcDupok      = 1 << iota // duplicate definitions ok
	funcWrapper                // hide frame from users (elide in tracebacks, don't count as a frame for recover())
	funcABIWrapper             // is an ABI wrapper (also set flagWrapper)
	funcNeedctxt               // function uses context register (has closure variables)

	MOVD	24(R1), R2

	UNSTACK_AND_RESTORE_GO_TO_HOST_ABI(32)
	RET

#ifdef GOARCH_ppc64le
TEXT runtime·cgoSigtramp(SB),NOSPLIT|NOFRAME,$0
	// The stack unwinder, presumably written in C, may not be able to
	// handle Go frame correctly. So, this function is NOFRAME, and we
	// save/restore LR manually, and obey ELFv2 calling conventions.
	MOVD	LR, R10

	// We're coming from C code, initialize R0
	MOVD	$0, R0

	op := operands[next]
	if len(op) < 2 || op[0].ScanToken != '$' {
		p.errorf("TEXT %s: frame size must be an immediate constant", name)
		return
	}
	op = op[1:]
	negative := false
	if op[0].ScanToken == '-' {
		negative = true
		op = op[1:]
	}
	if len(op) == 0 || op[0].ScanToken != scanner.Int {
		p.errorf("TEXT %s: frame size must be an immediate constant", name)
		return
	}

	// 3. By debugCallWrap to pass parameters to a new goroutine because allocating a
	//    closure in the runtime is forbidden.
	// 4. When a panic is recovered and control returns to the respective frame,
	//    param may point to a savedOpenDeferState.
	param        unsafe.Pointer
	atomicstatus atomic.Uint32
	stackLock    uint32 // sigprof/scang lock; TODO: fold in to atomicstatus
	goid         uint64

	re(`-fmacro-backtrace-limit=(.+)`),
	re(`-fmessage-length=(.+)`),
	re(`-f(no-)?modules`),
	re(`-f(no-)?objc-arc`),
	re(`-f(no-)?objc-nonfragile-abi`),
	re(`-f(no-)?objc-legacy-dispatch`),
	re(`-f(no-)?omit-frame-pointer`),
	re(`-f(no-)?openmp(-simd)?`),
	re(`-f(no-)?permissive`),
	re(`-f(no-)?(pic|PIC|pie|PIE)`),
	re(`-f(no-)?plt`),
	re(`-f(no-)?rtti`),
	re(`-f(no-)?split-stack`),
	re(`-f(no-)?stack-(.+)`),

	i := 0
	stk.Frames(func(f trace.StackFrame) bool {
		if i == 0 {
			// Allow for one fully zero stack.
			//
			// TODO(mknyszek): Investigate why that happens.
			return true
		}
		if f.Func == "" || f.File == "" || f.PC == 0 || f.Line == 0 {
			e.Errorf("invalid stack frame %#v: missing information", f)
		}
		i++
		return true
	})
}

}

func FrameStartLine(f *Frame) int {
	return f.startLine
}

// PersistentAlloc allocates some memory that lives outside the Go heap.
// This memory will never be freed; use sparingly.
func PersistentAlloc(n uintptr) unsafe.Pointer {
	return persistentalloc(n, 0, &memstats.other_sys)
}

// FPCallers works like Callers and uses frame pointer unwinding to populate

// Clobbers R19, R20.
TEXT	racecall<>(SB), NOSPLIT|NOFRAME, $0-0
	MOVD	g_m(g), R10
	// Switch to g0 stack.
	MOVD	RSP, R19	// callee-saved, preserved across the CALL
	MOVD	R30, R20	// callee-saved, preserved across the CALL
	MOVD	m_g0(R10), R11
	CMP	R11, g
	BEQ	call	// already on g0
	MOVD	(g_sched+gobuf_sp)(R11), R12
	MOVD	R12, RSP
call:
	// Decrement SP past where the frame pointer is saved in the Go arm64