__sdcc_critical.s (1755B)
1;-------------------------------------------------------------------------- 2; __sdcc_critical.s 3; 4; Copyright (C) 2020, Sergey Belyashov 5; 6; This library is free software; you can redistribute it and/or modify it 7; under the terms of the GNU General Public License as published by the 8; Free Software Foundation; either version 2, or (at your option) any 9; later version. 10; 11; This library is distributed in the hope that it will be useful, 12; but WITHOUT ANY WARRANTY; without even the implied warranty of 13; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14; GNU General Public License for more details. 15; 16; You should have received a copy of the GNU General Public License 17; along with this library; see the file COPYING. If not, write to the 18; Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston, 19; MA 02110-1301, USA. 20; 21; As a special exception, if you link this library with other files, 22; some of which are compiled with SDCC, to produce an executable, 23; this library does not by itself cause the resulting executable to 24; be covered by the GNU General Public License. This exception does 25; not however invalidate any other reasons why the executable file 26; might be covered by the GNU General Public License. 27;-------------------------------------------------------------------------- 28 29 .area _CODE 30 31 .globl ___sdcc_critical_enter 32; 33; NMOS Z80 compatible 34; this function cannot be placed at 0x0000...0x00ff addresses 35; 36___sdcc_critical_enter:: 37 xor a, a 38 push af 39 pop af 40 ld a, i 41 di 42 ret pe ;enabled interrupts 43 dec sp 44 dec sp 45 pop af 46 or a, a ;A = 0 if interrupts disabled 47 jr NZ, 00100$ 48;inetrrupts disabled 49 sub a, a ;force P/V = 0 50 ret 51;interrupts enabled 5200100$: 53 xor a, a ;force P/V = 1 54 ret