| /* |
| * Copyright (c) 2013, Google, Inc. All rights reserved |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining |
| * a copy of this software and associated documentation files |
| * (the "Software"), to deal in the Software without restriction, |
| * including without limitation the rights to use, copy, modify, merge, |
| * publish, distribute, sublicense, and/or sell copies of the Software, |
| * and to permit persons to whom the Software is furnished to do so, |
| * subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be |
| * included in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
| * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
| * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
| * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| |
| #include <asm.h> |
| |
| #define MODE_SVC 0x13 |
| |
| .syntax unified |
| |
| /* ARM syscall ABI |
| * =============== |
| * Only syscalls with 4 args (max) are currently supported |
| * r0-r3 = args |
| * r0-r1 = return value (r0 only if 32-bit retval) |
| * r12 = syscall number, expected to be trashed. |
| * syscalls run with interrupts enabled |
| */ |
| FUNCTION (arm_syscall) |
| srsdb sp!, #MODE_SVC |
| sub sp, sp, #8 |
| stmia sp, { r13-r14 }^ |
| |
| cpsie iaf |
| |
| ldr r14, =nr_syscalls |
| ldr r14, [r14] |
| cmp r12, r14 |
| |
| ldrlo r14, =syscall_table |
| ldrlo r14, [r14, r12, lsl#2] |
| rsbslo r12, r14, #1 /* This will set the same flags as the cmp above */ |
| ldrhs r14,=sys_undefined |
| blx r14 |
| |
| cpsid iaf |
| |
| ldmia sp, { r13-r14 }^ |
| add sp, sp, #8 |
| rfeia sp! |
