From f8a078764773263c596e67d3dd49a59423895c7c Mon Sep 17 00:00:00 2001
From: Eric Andersen <andersen@codepoet.org>
Date: Thu, 6 Mar 2003 15:03:33 +0000
Subject: Finish off gmon based profiling for powerpc

---
 libc/sysdeps/linux/powerpc/mcount.S | 100 ++++++++++++++++++++++++++++++++++++
 1 file changed, 100 insertions(+)
 create mode 100644 libc/sysdeps/linux/powerpc/mcount.S

(limited to 'libc/sysdeps/linux/powerpc/mcount.S')

diff --git a/libc/sysdeps/linux/powerpc/mcount.S b/libc/sysdeps/linux/powerpc/mcount.S
new file mode 100644
index 000000000..a9e3677a1
--- /dev/null
+++ b/libc/sysdeps/linux/powerpc/mcount.S
@@ -0,0 +1,100 @@
+/* PowerPC-specific implementation of profiling support.
+   Copyright (C) 1997, 1999 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <features.h>
+#include "ppc_asm.h"
+
+/* This would be bad.  */
+#ifdef PROF
+#undef PROF
+#endif
+
+
+/* We do profiling as described in the SYSV ELF ABI, _mcount is called
+   with the address of a data word in r0 (that is different for every
+   routine, initialised to 0, and otherwise unused).  The caller has put
+   the address the caller will return to in the usual place on the stack,
+   4(r1).  _mcount is responsible for ensuring that when it returns no
+   argument-passing registers are disturbed, and that the LR is set back
+   to (what the caller sees as) 4(r1).
+
+   This is intended so that the following code can be inserted at the
+   front of any routine without changing the routine:
+
+	.data
+	.align	2
+   0:	.long	0
+	.previous
+	mflr	r0
+	lis	r11,0b@ha
+	stw	r0,4(r1)
+	addi	r0,r11,0b@l
+	bl	_mcount
+*/
+
+
+.globl      _mcount;
+.type      _mcount, @function;
+.align  2;
+
+_mcount:
+	stwu	r1,-48(r1)
+/* We need to save the parameter-passing registers.  */
+	stw	r3, 12(r1)
+	stw	r4, 16(r1)
+	stw	r5, 20(r1)
+	stw	r6, 24(r1)
+	mflr	r4
+	lwz	r3, 52(r1)
+	mfcr	r5
+	stw	r7, 28(r1)
+	stw	r8, 32(r1)
+	stw	r9, 36(r1)
+	stw	r10,40(r1)
+	stw	r4, 44(r1)
+	stw	r5,  8(r1)
+#ifdef PIC
+	bl	__mcount_internal@plt
+#else
+	bl	__mcount_internal
+#endif
+	nop
+ /* Restore the registers...  */
+	lwz     r6,  8(r1)
+	lwz	r0, 44(r1)
+	lwz	r3, 12(r1)
+	mtctr	r0
+	lwz	r4, 16(r1)
+	mtcrf	0xff,r6
+	lwz	r5, 20(r1)
+	lwz	r6, 24(r1)
+	lwz	r0, 52(r1)
+	lwz	r7, 28(r1)
+	lwz	r8, 32(r1)
+	mtlr	r0
+	lwz	r9, 36(r1)
+	lwz	r10,40(r1)
+ /* ...unwind the stack frame, and return to your usual programming.  */
+	addi	r1,r1,48
+	bctr
+	.size _mcount,.-_mcount;
+
+#undef mcount
+.weak mcount ; mcount = _mcount
+
-- 
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