1//
2//  Copyright (c) 2012-2014, ARM Limited. All rights reserved.
3//
4//  This program and the accompanying materials
5//  are licensed and made available under the terms and conditions of the BSD License
6//  which accompanies this distribution.  The full text of the license may be found at
7//  http://opensource.org/licenses/bsd-license.php
8//
9//  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
10//  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
11//
12//
13
14
15    INCLUDE AsmMacroExport.inc
16
17 RVCT_ASM_EXPORT ArmCallSmc
18    push    {r4-r8}
19    // r0 will be popped just after the SMC call
20    push     {r0}
21
22    // Load the SMC arguments values into the appropriate registers
23    ldr     r7, [r0, #28]
24    ldr     r6, [r0, #24]
25    ldr     r5, [r0, #20]
26    ldr     r4, [r0, #16]
27    ldr     r3, [r0, #12]
28    ldr     r2, [r0, #8]
29    ldr     r1, [r0, #4]
30    ldr     r0, [r0, #0]
31
32    smc     #0
33
34    // Pop the ARM_SMC_ARGS structure address from the stack into r8
35    pop     {r8}
36
37    // Load the SMC returned values into the appropriate registers
38    // A SMC call can return up to 4 values - we do not need to store back r4-r7.
39    str     r3, [r8, #12]
40    str     r2, [r8, #8]
41    str     r1, [r8, #4]
42    str     r0, [r8, #0]
43
44    mov     r0, r8
45
46    // Restore the registers r4-r8
47    pop     {r4-r8}
48
49    bx      lr
50
51    END
52