glibc/sysdeps/csky/abiv2/csky-mcount.S

/* Implementation of profiling support.  C-SKY ABIV2 version.
   Copyright (C) 2018 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)