1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
//
// Copyright (c) 2012-2014, ARM Limited. All rights reserved.
// Copyright (c) 2014, Linaro Limited. All rights reserved.
//
// This program and the accompanying materials
// are licensed and made available under the terms and conditions of the BSD License
// which accompanies this distribution. The full text of the license may be found at
// http://opensource.org/licenses/bsd-license.php
//
// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
//
//
.text
.align 3
.arch_extension virt
GCC_ASM_EXPORT(ArmCallHvc)
ASM_PFX(ArmCallHvc):
push {r4-r8}
// r0 will be popped just after the HVC call
push {r0}
// Load the HVC arguments values into the appropriate registers
ldr r7, [r0, #28]
ldr r6, [r0, #24]
ldr r5, [r0, #20]
ldr r4, [r0, #16]
ldr r3, [r0, #12]
ldr r2, [r0, #8]
ldr r1, [r0, #4]
ldr r0, [r0, #0]
hvc #0
// Pop the ARM_HVC_ARGS structure address from the stack into r8
pop {r8}
// Load the HVC returned values into the appropriate registers
// A HVC call can return up to 4 values - we do not need to store back r4-r7.
str r3, [r8, #12]
str r2, [r8, #8]
str r1, [r8, #4]
str r0, [r8, #0]
mov r0, r8
// Restore the registers r4-r8
pop {r4-r8}
bx lr
|
