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
54
55
56
|
/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (c) 2016, Linaro Limited
* All rights reserved.
*/
#include <asm.S>
#ifdef CFG_TA_GPROF_SUPPORT
/*
* Convert return address to call site address by subtracting the size of one
* instruction.
*/
.macro adjust_pc rd, rn
sub \rd, \rn, #4
.endm
/*
* void __utee_mcount(void *return_address)
* @return_address: return address to instrumented function
*
* With the -pg option, the compiler inserts a call to _mcount into
* every function prologue.
* x0 contains the value of lr (x30) before the call, that is the return
* address to the caller of the instrumented function. The callee, i.e. the
* instrumented function itself, is determined from the current value of x30.
* Then we call:
* void __mcount_internal(void *frompc, void *selfpc);
*
* _mcount is defined and set to the value of this function by the linker
* script if the TA is instrumented, i.e., if _mcount is referenced
*/
FUNC __utee_mcount, :
stp x29, x30, [sp, #-16]!
mov x29, sp
adjust_pc x0, x0
adjust_pc x1, x30
bl __mcount_internal
ldp x29, x30, [sp], #16
ret
END_FUNC __utee_mcount
#else /* !CFG_TA_GPROF_SUPPORT */
/*
* The TA linker script always references __utee_mcount so provide a version
* that does nothing
*/
.weak __utee_mcount
FUNC __utee_mcount, :
ret
END_FUNC __utee_mcount
#endif /* CFG_TA_GPROF_SUPPORT */
|
