Initial effort at adding profiling support.

1 files changed, 67 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/arm/bits/machine-gmon.h b/libc/sysdeps/linux/arm/bits/machine-gmon.h
new file mode 100644
index 000000000..039dfd951
--- /dev/null
+++ b/libc/sysdeps/linux/arm/bits/machine-gmon.h
@@ -0,0 +1,67 @@
+/* Machine-dependent definitions for profiling support.  ARM version.
+   Copyright (C) 1996, 1997, 1998 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.  */
+
+/* GCC for the ARM cannot compile __builtin_return_address(N) for N != 0, 
+   so we must use an assembly stub.  */
+
+#include <sysdep.h>
+#ifndef NO_UNDERSCORES
+/* The asm symbols for C functions are `_function'.
+   The canonical name for the counter function is `mcount', no _.  */
+void _mcount (void) asm ("mcount");
+#else
+/* The canonical name for the function is `_mcount' in both C and asm,
+   but some old asm code might assume it's `mcount'.  */
+void _mcount (void);
+weak_alias (_mcount, mcount)
+#endif
+
+static void mcount_internal (u_long frompc, u_long selfpc);
+
+#define _MCOUNT_DECL(frompc, selfpc) \
+static void mcount_internal (u_long frompc, u_long selfpc)
+
+/* This macro/func MUST save r0, r1 because the compiler inserts
+	blind calls to _mount(), ignoring the fact that _mcount may
+	clobber registers; therefore, _mcount may NOT clobber registers */
+/* if (this_fp!=0) {
+	r0 = this_fp
+	r1 = this_lr
+  	r1 = [r1-4] which is caller's lr 
+	if (r1!=0) 
+		r1 = caller's lr
+	call mcount_internal(this_lr, caller's_lr)
+   }
+*/
+
+#define MCOUNT								\
+void _mcount (void)							\
+{									\
+  __asm__("stmdb	sp!, {r0, r1, r2, r3};"				\
+	  "movs		fp, fp;"				      	\
+          "moveq	r1, #0;"					\
+	  "ldrne	r1, [fp, $-4];"					\
+	  "ldrne	r0, [fp, $-12];"				\
+	  "movnes	r0, r0;"					\
+	  "ldrne	r0, [r0, $-4];"					\
+	  "movs		r0, r0;"					\
+	  "blne		mcount_internal;"				\
+	  "ldmia	sp!, {r0, r1, r2, r3}");			\
+}
+