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1 | /* Implementation of profiling support. ARM EABI version. | |
2 | Copyright (C) 2008-2019 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library. If not, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | /* Don't call mcount when calling mcount... */ | |
20 | #undef PROF | |
21 | ||
22 | #include <sysdep.h> | |
23 | ||
24 | #undef mcount | |
25 | ||
26 | #ifdef __thumb2__ | |
27 | .thumb | |
28 | #endif | |
29 | .syntax unified | |
30 | ||
31 | ||
32 | /* Use an assembly stub with a special ABI. The calling lr has been | |
33 | pushed to the stack (which will be misaligned). We should preserve | |
34 | all registers except ip and pop a word off the stack. | |
35 | ||
36 | NOTE: This assumes mcount_internal does not clobber any non-core | |
37 | (coprocessor) registers. Currently this is true, but may require | |
38 | additional attention in the future. | |
39 | ||
40 | The calling sequence looks something like: | |
41 | func: | |
42 | push {lr} | |
43 | bl __gnu_mcount_nc | |
44 | <function body> | |
45 | */ | |
46 | ||
47 | ENTRY(__gnu_mcount_nc) | |
48 | push {r0, r1, r2, r3, lr} | |
49 | cfi_adjust_cfa_offset (20) | |
50 | cfi_rel_offset (r0, 0) | |
51 | cfi_rel_offset (r1, 4) | |
52 | cfi_rel_offset (r2, 8) | |
53 | cfi_rel_offset (r3, 12) | |
54 | cfi_rel_offset (lr, 16) | |
55 | bic r1, lr, #1 | |
56 | ldr r0, [sp, #20] | |
57 | bl __mcount_internal | |
58 | pop {r0, r1, r2, r3, ip, lr} | |
59 | cfi_adjust_cfa_offset (-24) | |
60 | cfi_restore (r0) | |
61 | cfi_restore (r1) | |
62 | cfi_restore (r2) | |
63 | cfi_restore (r3) | |
64 | cfi_register (lr, ip) | |
65 | bx ip | |
66 | END(__gnu_mcount_nc) | |
67 | ||
68 | ||
69 | #include <gcc-compat.h> | |
70 | #include <shlib-compat.h> | |
71 | ||
72 | /* The new __gnu_mcount_nc entry point was introduced in 4.4, so the | |
73 | static library needs the old one only to support older compilers. | |
74 | Even in a configuration that only cares about newer compilers, the | |
75 | shared library might need it only for strict ABI compatibility. */ | |
76 | ||
77 | #if GCC_COMPAT (4, 3) || SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_19) | |
78 | ||
79 | /* Provide old mcount for backwards compatibility. This requires | |
80 | code be compiled with APCS frame pointers. */ | |
81 | ||
82 | ENTRY(__mcount_arm_compat) | |
83 | push {r0, r1, r2, r3, fp, lr} | |
84 | cfi_adjust_cfa_offset (24) | |
85 | cfi_rel_offset (r0, 0) | |
86 | cfi_rel_offset (r1, 4) | |
87 | cfi_rel_offset (r2, 8) | |
88 | cfi_rel_offset (r3, 12) | |
89 | cfi_rel_offset (fp, 16) | |
90 | cfi_rel_offset (lr, 20) | |
91 | movs r0, fp | |
92 | ittt ne | |
93 | ldrne r0, [r0, #-4] | |
94 | movsne r1, lr | |
95 | blne __mcount_internal | |
96 | # if defined (__ARM_ARCH_4T__) && defined (__THUMB_INTERWORK__) | |
97 | pop {r0, r1, r2, r3, fp, lr} | |
98 | cfi_adjust_cfa_offset (-24) | |
99 | cfi_restore (r0) | |
100 | cfi_restore (r1) | |
101 | cfi_restore (r2) | |
102 | cfi_restore (r3) | |
103 | cfi_restore (fp) | |
104 | cfi_restore (lr) | |
105 | bx lr | |
106 | # else | |
107 | pop {r0, r1, r2, r3, fp, pc} | |
108 | # endif | |
109 | END(__mcount_arm_compat) | |
110 | ||
111 | #endif | |
112 | ||
113 | #if GCC_COMPAT (4, 3) | |
114 | ||
115 | strong_alias (__mcount_arm_compat, _mcount) | |
116 | ||
117 | /* The canonical name for the function is `_mcount' in both C and asm, | |
118 | but some old asm code might assume it's `mcount'. */ | |
119 | weak_alias (_mcount, mcount) | |
120 | ||
121 | #elif SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_19) | |
122 | ||
123 | compat_symbol (libc, __mcount_arm_compat, _mcount, GLIBC_2_0) | |
124 | ||
125 | strong_alias (__mcount_arm_compat, __mcount_arm_compat_1) | |
126 | compat_symbol (libc, __mcount_arm_compat_1, mcount, GLIBC_2_0) | |
127 | ||
128 | #endif |