]>
Commit | Line | Data |
---|---|---|
5f1d477b DJ |
1 | /* Machine-dependent definitions for profiling support. ARM EABI version. |
2 | Copyright (C) 2008 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, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
19 | ||
20 | /* GCC for the ARM cannot compile __builtin_return_address(N) for N != 0, | |
21 | so we must use an assembly stub. */ | |
22 | ||
23 | #include <sysdep.h> | |
24 | static void mcount_internal (u_long frompc, u_long selfpc) __attribute_used__; | |
25 | ||
26 | #define _MCOUNT_DECL(frompc, selfpc) \ | |
27 | static void mcount_internal (u_long frompc, u_long selfpc) | |
28 | ||
29 | /* Use an assembly stub with a special ABI. The calling lr has been | |
30 | pushed to the stack (which will be misaligned). We should preserve | |
31 | all registers except ip and pop a word off the stack. | |
32 | ||
33 | NOTE: This assumes mcount_internal does not clobber any non-core | |
34 | (coprocessor) registers. Currently this is true, but may require | |
35 | additional attention in the future. | |
36 | ||
37 | The calling sequence looks something like: | |
38 | func: | |
39 | push {lr} | |
40 | bl __gnu_mount_nc | |
41 | <function body> | |
42 | */ | |
43 | ||
44 | ||
45 | #define MCOUNT \ | |
46 | void __attribute__((__naked__)) __gnu_mcount_nc(void) \ | |
47 | { \ | |
48 | asm ("push {r0, r1, r2, r3, lr}\n\t" \ | |
49 | "bic r1, lr, #1\n\t" \ | |
50 | "ldr r0, [sp, #20]\n\t" \ | |
51 | "bl mcount_internal\n\t" \ | |
52 | "pop {r0, r1, r2, r3, ip, lr}\n\t" \ | |
53 | "bx ip"); \ | |
54 | } \ | |
55 | OLD_MCOUNT | |
56 | ||
57 | /* Provide old mcount for backwards compatibility. This requires | |
58 | code be compiled with APCS frame pointers. */ | |
59 | ||
60 | #ifndef NO_UNDERSCORES | |
61 | /* The asm symbols for C functions are `_function'. | |
62 | The canonical name for the counter function is `mcount', no _. */ | |
63 | void _mcount (void) asm ("mcount"); | |
64 | #else | |
65 | /* The canonical name for the function is `_mcount' in both C and asm, | |
66 | but some old asm code might assume it's `mcount'. */ | |
67 | void _mcount (void); | |
68 | weak_alias (_mcount, mcount) | |
69 | #endif | |
70 | ||
71 | #ifdef __thumb2__ | |
72 | ||
73 | #define OLD_MCOUNT \ | |
74 | void __attribute__((__naked__)) _mcount (void) \ | |
75 | { \ | |
76 | __asm__("push {r0, r1, r2, r3, fp, lr};" \ | |
77 | "movs r0, fp;" \ | |
78 | "ittt ne;" \ | |
79 | "ldrne r0, [r0, #-4];" \ | |
80 | "movsne r1, lr;" \ | |
81 | "blne mcount_internal;" \ | |
82 | "pop {r0, r1, r2, r3, fp, pc}"); \ | |
83 | } | |
84 | ||
85 | #else | |
86 | ||
87 | #define OLD_MCOUNT \ | |
88 | void __attribute__((__naked__)) _mcount (void) \ | |
89 | { \ | |
90 | __asm__("stmdb sp!, {r0, r1, r2, r3, fp, lr};" \ | |
91 | "movs fp, fp;" \ | |
92 | "ldrne r0, [fp, #-4];" \ | |
93 | "movnes r1, lr;" \ | |
94 | "blne mcount_internal;" \ | |
95 | "ldmia sp!, {r0, r1, r2, r3, fp, lr};" \ | |
96 | "bx lr"); \ | |
97 | } | |
98 | ||
99 | #endif |