1*344aa361SAndroid Build Coastguard Worker/* 2*344aa361SAndroid Build Coastguard Worker * Copyright (c) 2014, Google, Inc. All rights reserved 3*344aa361SAndroid Build Coastguard Worker * 4*344aa361SAndroid Build Coastguard Worker * Permission is hereby granted, free of charge, to any person obtaining 5*344aa361SAndroid Build Coastguard Worker * a copy of this software and associated documentation files 6*344aa361SAndroid Build Coastguard Worker * (the "Software"), to deal in the Software without restriction, 7*344aa361SAndroid Build Coastguard Worker * including without limitation the rights to use, copy, modify, merge, 8*344aa361SAndroid Build Coastguard Worker * publish, distribute, sublicense, and/or sell copies of the Software, 9*344aa361SAndroid Build Coastguard Worker * and to permit persons to whom the Software is furnished to do so, 10*344aa361SAndroid Build Coastguard Worker * subject to the following conditions: 11*344aa361SAndroid Build Coastguard Worker * 12*344aa361SAndroid Build Coastguard Worker * The above copyright notice and this permission notice shall be 13*344aa361SAndroid Build Coastguard Worker * included in all copies or substantial portions of the Software. 14*344aa361SAndroid Build Coastguard Worker * 15*344aa361SAndroid Build Coastguard Worker * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 16*344aa361SAndroid Build Coastguard Worker * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 17*344aa361SAndroid Build Coastguard Worker * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 18*344aa361SAndroid Build Coastguard Worker * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY 19*344aa361SAndroid Build Coastguard Worker * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 20*344aa361SAndroid Build Coastguard Worker * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 21*344aa361SAndroid Build Coastguard Worker * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 22*344aa361SAndroid Build Coastguard Worker */ 23*344aa361SAndroid Build Coastguard Worker 24*344aa361SAndroid Build Coastguard Worker#include <arch/asm_macros.h> 25*344aa361SAndroid Build Coastguard Worker#include <asm.h> 26*344aa361SAndroid Build Coastguard Worker 27*344aa361SAndroid Build Coastguard Worker#define DAIF_MASK_IAF 0x7 28*344aa361SAndroid Build Coastguard Worker 29*344aa361SAndroid Build Coastguard Worker/* ARM syscall ABI 30*344aa361SAndroid Build Coastguard Worker * =============== 31*344aa361SAndroid Build Coastguard Worker * Only syscalls with 4 args (max) are currently supported 32*344aa361SAndroid Build Coastguard Worker * r0-r3/x0-x3 = args 33*344aa361SAndroid Build Coastguard Worker * r0-r1/x0 = return value (r0 only if 32-bit retval) 34*344aa361SAndroid Build Coastguard Worker * r12/x12 = syscall number, expected to be trashed. 35*344aa361SAndroid Build Coastguard Worker * syscalls run with interrupts enabled 36*344aa361SAndroid Build Coastguard Worker */ 37*344aa361SAndroid Build Coastguard WorkerFUNCTION (arm64_syscall) 38*344aa361SAndroid Build Coastguard Worker push x0, x30 39*344aa361SAndroid Build Coastguard Worker ldr w12, [x0, #(12 << 3)] 40*344aa361SAndroid Build Coastguard Worker 41*344aa361SAndroid Build Coastguard Worker msr daifclr, #DAIF_MASK_IAF 42*344aa361SAndroid Build Coastguard Worker 43*344aa361SAndroid Build Coastguard Worker adrl x14, nr_syscalls 44*344aa361SAndroid Build Coastguard Worker ldr x14, [x14] 45*344aa361SAndroid Build Coastguard Worker cmp x12, x14 46*344aa361SAndroid Build Coastguard Worker b.hs .Lundefined 47*344aa361SAndroid Build Coastguard Worker adrl x14, syscall_table 48*344aa361SAndroid Build Coastguard Worker ldr x14, [x14, x12, lsl#3] 49*344aa361SAndroid Build Coastguard Worker cbnz x14, .Ldefined 50*344aa361SAndroid Build Coastguard Worker.Lundefined: 51*344aa361SAndroid Build Coastguard Worker adrl x14, sys_undefined 52*344aa361SAndroid Build Coastguard Worker.Ldefined: 53*344aa361SAndroid Build Coastguard Worker ldp x2, x3, [x0, #16] 54*344aa361SAndroid Build Coastguard Worker ldp x0, x1, [x0] 55*344aa361SAndroid Build Coastguard Worker blr x14 56*344aa361SAndroid Build Coastguard Worker 57*344aa361SAndroid Build Coastguard Worker msr daifset, #DAIF_MASK_IAF 58*344aa361SAndroid Build Coastguard Worker 59*344aa361SAndroid Build Coastguard Worker pop x1, x30 60*344aa361SAndroid Build Coastguard Worker 61*344aa361SAndroid Build Coastguard Worker str x0, [x1, 0] 62*344aa361SAndroid Build Coastguard Worker 63*344aa361SAndroid Build Coastguard Worker ret 64