runtime: implement stackcheck for arm64

Author: mauri870

src/runtime/asm_arm64.s

@@ -1596,3 +1596,19 @@ TEXT runtime·panicSliceConvert<ABIInternal>(SB),NOSPLIT,$0-16
 TEXT ·getfp<ABIInternal>(SB),NOSPLIT|NOFRAME,$0
 MOVD R29, R0
 RET
+
+// check that SP is in range [g->stack.lo, g->stack.hi)
+TEXT runtime·stackcheck(SB), NOSPLIT|NOFRAME, $0-0
+MOVDRSP, R0
+MOVD(g_stack+stack_hi)(g), R4
+CMPR0, R4
+BLEret
+B	runtime·abort(SB)
+
+MOVD(g_stack+stack_lo)(g), R4
+CMP	R0, R4
+BGEret
+B	runtime·abort(SB)
+
+ret:
+RET

src/runtime/sys_darwin_arm64.s

@@ -360,6 +360,7 @@ TEXT runtime·mstart_stub(SB),NOSPLIT,$160
 MOVDm_g0(R0), g
 BL·save_g(SB)
 
+BLruntime·stackcheck(SB)
 BLruntime·mstart(SB)
 
 // Restore callee-save registers.

src/runtime/sys_freebsd_arm64.s

@@ -80,7 +80,8 @@ TEXT runtime·thr_start(SB),NOSPLIT,$0
 // set up g
 MOVDm_g0(R0), g
 MOVDR0, g_m(g)
-BL	emptyfunc<>(SB) // fault if stack check is wrong
+
+BL	runtime·stackcheck(SB)// fault if stack check is wrong
 BL	runtime·mstart(SB)
 
 MOVD$2, R8// crash (not reached)

src/runtime/sys_linux_arm64.s

@@ -707,7 +707,7 @@ good:
 // In child, set up new stack
 MOVDR10, g_m(R11)
 MOVDR11, g
-//CALLruntime·stackcheck(SB)
+CALLruntime·stackcheck(SB)
 
 nog:
 // Call fn

src/runtime/sys_openbsd_arm64.s

@@ -30,6 +30,7 @@ TEXT runtime·mstart_stub(SB),NOSPLIT,$144
 MOVD m_g0(R0), g
 BLruntime·save_g(SB)
 
+BLruntime·stackcheck(SB)	// fault if stack check is wrong
 BLruntime·mstart(SB)
 
 // Restore callee-save registers.

src/runtime/sys_windows_arm64.s

@@ -219,7 +219,7 @@ TEXT runtime·tstart_stdcall(SB),NOSPLIT,$96-0
 MOVDR0, g_stackguard0(g)
 MOVDR0, g_stackguard1(g)
 
-BL	runtime·emptyfunc(SB)// fault if stack check is wrong
+BL	runtime·stackcheck(SB)// fault if stack check is wrong
 BL	runtime·mstart(SB)
 
 RESTORE_R19_TO_R28(8*3)