Current File : //proc/self/root/glibc-2.29/sysdeps/csky/abiv2/csky-mcount.S
/* Implementation of profiling support. C-SKY ABIV2 version.
Copyright (C) 2018-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
/* Use an assembly stub with a special ABI. The calling lr has been
pushed to the stack (which will be misaligned). We should preserve
all registers except ip and pop a word off the stack.
NOTE: This assumes mcount_internal does not clobber any non-core
(coprocessor) registers. Currently this is true, but may require
additional attention in the future.
The calling sequence looks something like:
func:
push lr
jbsr _mount
<function body>
*/
/* Don't call mcount when calling mcount... */
#undef PROF
ENTRY (_mcount)
subi sp, 20
stw a0, (sp, 0)
stw a1, (sp, 4)
stw a2, (sp, 8)
stw a3, (sp, 12)
stw lr, (sp, 16)
mov a1, lr
ldw a0, (sp, 20)
#ifdef __PIC__
grs t1, .Lgetpc
.Lgetpc:
lrw t0, .Lgetpc@GOTPC
addu t1, t0
lrw t0, __mcount_internal@PLT
ldr.w t0, (t1, t0 << 0)
jsr t0
#else
jsri __mcount_internal
#endif /* !__PIC__ */
ldw a0, (sp, 0)
ldw a1, (sp, 4)
ldw a2, (sp, 8)
ldw a3, (sp, 12)
ldw t1, (sp, 16)
ldw lr, (sp, 20)
addi sp, 24
jmp t1
END (_mcount)
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