1*344aa361SAndroid Build Coastguard Worker/* 2*344aa361SAndroid Build Coastguard Worker * Copyright (c) 2013, 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 <asm.h> 25*344aa361SAndroid Build Coastguard Worker 26*344aa361SAndroid Build Coastguard Worker#define MODE_SVC 0x13 27*344aa361SAndroid Build Coastguard Worker 28*344aa361SAndroid Build Coastguard Worker.syntax unified 29*344aa361SAndroid Build Coastguard Worker 30*344aa361SAndroid Build Coastguard Worker/* ARM syscall ABI 31*344aa361SAndroid Build Coastguard Worker * =============== 32*344aa361SAndroid Build Coastguard Worker * Only syscalls with 4 args (max) are currently supported 33*344aa361SAndroid Build Coastguard Worker * r0-r3 = args 34*344aa361SAndroid Build Coastguard Worker * r0-r1 = return value (r0 only if 32-bit retval) 35*344aa361SAndroid Build Coastguard Worker * r12 = syscall number, expected to be trashed. 36*344aa361SAndroid Build Coastguard Worker * syscalls run with interrupts enabled 37*344aa361SAndroid Build Coastguard Worker */ 38*344aa361SAndroid Build Coastguard WorkerFUNCTION (arm_syscall) 39*344aa361SAndroid Build Coastguard Worker srsdb sp!, #MODE_SVC 40*344aa361SAndroid Build Coastguard Worker sub sp, sp, #8 41*344aa361SAndroid Build Coastguard Worker stmia sp, { r13-r14 }^ 42*344aa361SAndroid Build Coastguard Worker 43*344aa361SAndroid Build Coastguard Worker cpsie iaf 44*344aa361SAndroid Build Coastguard Worker 45*344aa361SAndroid Build Coastguard Worker ldr r14, =nr_syscalls 46*344aa361SAndroid Build Coastguard Worker ldr r14, [r14] 47*344aa361SAndroid Build Coastguard Worker cmp r12, r14 48*344aa361SAndroid Build Coastguard Worker 49*344aa361SAndroid Build Coastguard Worker ldrlo r14, =syscall_table 50*344aa361SAndroid Build Coastguard Worker ldrlo r14, [r14, r12, lsl#2] 51*344aa361SAndroid Build Coastguard Worker rsbslo r12, r14, #1 /* This will set the same flags as the cmp above */ 52*344aa361SAndroid Build Coastguard Worker ldrhs r14,=sys_undefined 53*344aa361SAndroid Build Coastguard Worker blx r14 54*344aa361SAndroid Build Coastguard Worker 55*344aa361SAndroid Build Coastguard Worker cpsid iaf 56*344aa361SAndroid Build Coastguard Worker 57*344aa361SAndroid Build Coastguard Worker ldmia sp, { r13-r14 }^ 58*344aa361SAndroid Build Coastguard Worker add sp, sp, #8 59*344aa361SAndroid Build Coastguard Worker rfeia sp! 60