RET

// This is the function registered during sigaction and is invoked when
// a signal is received. It just redirects to the Go function sigtrampgo.
// Called using C ABI.
TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME|NOFRAME,$0
	// Transition from C ABI to Go ABI.
	PUSH_REGS_HOST_TO_ABI0()

	// Set up ABIInternal environment: g in R14, cleared X15.
	get_tls(R12)
	MOVQ	g(R12), R14
	PXOR	X15, X15

	MOV	$0, X10

	RET

TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
	MOVW	sig+8(FP), X10
	MOV	info+16(FP), X11
	MOV	ctx+24(FP), X12
	MOV	fn+0(FP), X5
	JALR	X1, X5
	RET

TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$224
	// Save callee-save registers (X8, X9, X18..X27, F8, F9, F18..F27)
	MOV	X8, (4*8)(X2)
	MOV	X9, (5*8)(X2)
	MOV	X18, (6*8)(X2)
	MOV	X19, (7*8)(X2)
	MOV	X20, (8*8)(X2)
	MOV	X21, (9*8)(X2)

	ADD	$16, R13
	MOVM.IA.W (R13), [R4-R11]

	RET

TEXT ·publicationBarrier(SB),NOSPLIT|NOFRAME,$0-0
	B	runtime·armPublicationBarrier(SB)

// TODO(jsing): OpenBSD only supports GOARM=7 machines... this
// should not be needed, however the linker still allows GOARM=5
// on this platform.
TEXT runtime·read_tls_fallback(SB),NOSPLIT|NOFRAME,$0
	MOVM.WP	[R1, R2, R3, R12], (R13)
	MOVW	$330, R12		// sys___get_tcb
	INVOKE_SYSCALL

	RET

TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
	MOVW	sig+8(FP), R0
	MOVD	info+16(FP), R1
	MOVD	ctx+24(FP), R2
	MOVD	fn+0(FP), R11
	BL	(R11)
	RET

TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$176
	// Save callee-save registers in the case of signal forwarding.
	// Please refer to https://golang.org/issue/31827 .
	SAVE_R19_TO_R28(8*4)
	SAVE_F8_TO_F15(8*14)

	// Save arguments.

	MOVL	CX, 4(SP)
	MOVL	DX, 8(SP)
	MOVL	SI, 12(SP)	// save SI: handler might be a Go function
	CALL	AX
	MOVL	12(SP), AX
	MOVL	AX, SP
	RET

// Called using C ABI.
TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$28
	// Save callee-saved C registers, since the caller may be a C signal handler.
	MOVL	BX, bx-4(SP)
	MOVL	BP, bp-8(SP)
	MOVL	SI, si-12(SP)
	MOVL	DI, di-16(SP)

	if s.CFunc() {
		fmt.Fprintf(ctxt.Bso, "cfunc ")
	}
	if s.NoSplit() {
		fmt.Fprintf(ctxt.Bso, "nosplit ")
	}
	if s.Func() != nil && s.Func().FuncFlag&abi.FuncFlagTopFrame != 0 {
		fmt.Fprintf(ctxt.Bso, "topframe ")
	}
	if s.Func() != nil && s.Func().FuncFlag&abi.FuncFlagAsm != 0 {
		fmt.Fprintf(ctxt.Bso, "asm ")
	}
	fmt.Fprintf(ctxt.Bso, "size=%d", s.Size)
	if s.Type == objabi.STEXT {
		fn := s.Func()

	MOVL	CX, 4(SP)
	MOVL	DX, 8(SP)
	MOVL	SI, 12(SP)	// save SI: handler might be a Go function
	CALL	AX
	MOVL	12(SP), AX
	MOVL	AX, SP
	RET

// Called by OS using C ABI.
TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$28
	NOP	SP	// tell vet SP changed - stop checking offsets
	// Save callee-saved C registers, since the caller may be a C signal handler.
	MOVL	BX, bx-4(SP)
	MOVL	BP, bp-8(SP)
	MOVL	SI, si-12(SP)
	MOVL	DI, di-16(SP)

func (s *LSym) TextAttrString() string {
	attr := s.Attribute.String()
	if s.Func().FuncFlag&abi.FuncFlagTopFrame != 0 {
		if attr != "" {
			attr += "|"
		}
		attr += "TOPFRAME"
	}
	return attr
}

func (s *LSym) String() string {
	return s.Name
}

// The compiler needs *LSym to be assignable to cmd/compile/internal/ssa.Sym.
func (*LSym) CanBeAnSSASym() {}

		if !fi.Valid() {
			continue
		}
		fpcsp := d.ldr.Pcsp(s)

		// Emit a FDE, Section 6.4.1.
		// First build the section contents into a byte buffer.
		deltaBuf = deltaBuf[:0]
		if haslr && fi.TopFrame() {
			// Mark the link register as having an undefined value.
			// This stops call stack unwinders progressing any further.
			// TODO: similar mark on non-LR architectures.

Put this data in thread local storage.
</li>
<li>
<code>NOFRAME</code> = 512
<br>
(For <code>TEXT</code> items.)
Do not insert instructions to allocate a stack frame and save/restore the return
address, even if this is not a leaf function.
Only valid on functions that declare a frame size of 0.
</li>
<li>
<code>TOPFRAME</code> = 2048
<br>
(For <code>TEXT</code> items.)