1 /* Implementation of profiling support. ARM EABI version.
2 Copyright (C) 2008, 2009 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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
20 /* Don't call mcount when calling mcount... */
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.
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.
40 The calling sequence looks something like:
47 ENTRY(__gnu_mcount_nc)
48 push {r0, r1, r2, r3, lr}
52 pop {r0, r1, r2, r3, ip, lr}
57 /* Provide old mcount for backwards compatibility. This requires
58 code be compiled with APCS frame pointers. */
61 stmdb sp!, {r0, r1, r2, r3, fp, lr}
71 blne __mcount_internal
73 ldmia sp!, {r0, r1, r2, r3, fp, pc}
75 ldmia sp!, {r0, r1, r2, r3, fp, lr}
80 /* The canonical name for the function is `_mcount' in both C and asm,
81 but some old asm code might assume it's `mcount'. */
83 weak_alias (_mcount, mcount)