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478ba61a MF |
1 | /* |
2 | * arch/xtensa/kernel/mcount.S | |
3 | * | |
4 | * Xtensa specific mcount support | |
5 | * | |
6 | * This file is subject to the terms and conditions of the GNU General Public | |
7 | * License. See the file "COPYING" in the main directory of this archive | |
8 | * for more details. | |
9 | * | |
10 | * Copyright (C) 2013 Tensilica Inc. | |
11 | */ | |
12 | ||
13 | #include <linux/linkage.h> | |
14 | #include <asm/ftrace.h> | |
15 | ||
16 | /* | |
17 | * Entry condition: | |
18 | * | |
19 | * a2: a0 of the caller | |
20 | */ | |
21 | ||
22 | ENTRY(_mcount) | |
23 | ||
24 | entry a1, 16 | |
25 | ||
26 | movi a4, ftrace_trace_function | |
27 | l32i a4, a4, 0 | |
28 | movi a3, ftrace_stub | |
29 | bne a3, a4, 1f | |
30 | retw | |
31 | ||
32 | 1: xor a7, a2, a1 | |
33 | movi a3, 0x3fffffff | |
34 | and a7, a7, a3 | |
35 | xor a7, a7, a1 | |
36 | ||
37 | xor a6, a0, a1 | |
38 | and a6, a6, a3 | |
39 | xor a6, a6, a1 | |
40 | addi a6, a6, -MCOUNT_INSN_SIZE | |
41 | callx4 a4 | |
42 | ||
43 | retw | |
44 | ||
45 | ENDPROC(_mcount) | |
46 | ||
47 | ENTRY(ftrace_stub) | |
48 | entry a1, 16 | |
49 | retw | |
50 | ENDPROC(ftrace_stub) |