Patch from Stefan Allius to finish off the last required bits

for gmon profiling support for the SuperH target.

1 files changed, 76 insertions, 25 deletions

diff --git a/libc/sysdeps/linux/sh/bits/machine-gmon.h b/libc/sysdeps/linux/sh/bits/machine-gmon.h
index 46c7b191a..6497859ad 100644
--- a/libc/sysdeps/linux/sh/bits/machine-gmon.h
+++ b/libc/sysdeps/linux/sh/bits/machine-gmon.h
@@ -1,32 +1,83 @@
 /* Machine-dependent definitions for profiling support.  SH version.
-   Copyright (C) 1996, 1997, 1998, 2000 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
+ *
+ * Copyright (C) 2003 Stefan Allius <allius@atecom.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this program; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ * 02111-1307 USA
+ */
 
-   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.  */
-
-/* We must not pollute the global namespace.  */
 #define mcount_internal __mcount_internal
 
-void mcount_internal (u_long frompc, u_long selfpc);
-
 #define _MCOUNT_DECL(frompc, selfpc) \
-void mcount_internal (u_long frompc, u_long selfpc)
-
+static void __attribute__((unused)) mcount_internal (u_long frompc, u_long selfpc)
 
-/* Define MCOUNT as empty since we have the implementation in another
-   file.  */
-#define MCOUNT
+/*
+ * This mcount implementation expect the 'frompc' return address on
+ * the stack and the 'selfpc' return address in register pr.
+ *
+ * Your compiler should include some stuff like this at each function
+ * entry:
+ *
+ *	mov.l	1f,r1
+ *	sts.l	pr,@-r15
+ *	mova	2f,r0
+ *	jmp	@r1
+ *	 lds	r0,pr
+ *	.align	2
+ * 1:	.long	mcount
+ * 2:	lds.l	@r15+,pr
+ *
+ * or for PIC:
+ *
+ *	mov.l	3f,r1
+ *	mova	3f,r0
+ *	add	r1,r0
+ *	mov.l	1f,r1
+ *	mov.l	@(r0,r1),r1
+ *	sts.l	pr,@-r15
+ *	mova	2f,r0
+ *	jmp	@r1
+ *	 lds	r0,pr
+ *	.align	2
+ * 1:	.long	mcount@GOT
+ * 3:	.long	_GLOBAL_OFFSET_TABLE_
+ * 2:	lds.l	@r15+,pr
+ *
+ *
+ * This ABI will be supported by GCC version 3.3 or newer!
+ */
+#define MCOUNT asm(\
+	".align 4\n\t" \
+	".globl _mcount\n\t" \
+	".type _mcount,@function\n" \
+        "_mcount:\n\t" \
+	"mov.l r4,  @-r15\n\t" \
+	"mov.l r5,  @-r15\n\t" \
+	"mov.l r6,  @-r15\n\t" \
+	"mov.l r7,  @-r15\n\t" \
+	"sts.l pr,  @-r15\n\t" \
+	"sts   pr, r5\n\t" \
+	"bsr __mcount_internal\n\t" \
+	" mov.l @(5*4,r15), r4\n\t" \
+	"lds.l @r15+, pr\n\t" \
+	"mov.l @r15+, r7\n\t" \
+	"mov.l @r15+, r6\n\t" \
+	"mov.l @r15+, r5\n\t" \
+	"rts\n\t" \
+	" mov.l @r15+, r4\n\t" \
+	".size _mcount,.-_mcount;\n\t" \
+	".weak mcount;\n\t" \
+	" mcount = _mcount;");