2008-04-02 Paul Brook <paul@codesourcery.com>

	Backport from trunk.
	* sysdeps/arm/eabi/machine-gmon.h: New file.



git-svn-id: svn://svn.eglibc.org/branches/eglibc-2_6@5763 7b3dc134-2b1b-0410-93df-9e9f96275f8d

2 files changed, 98 insertions, 0 deletions

diff --git a/ports/ChangeLog.eglibc b/ports/ChangeLog.eglibc
index a220447f4..4f6bc0189 100644
--- a/ports/ChangeLog.eglibc
+++ b/ports/ChangeLog.eglibc
@@ -1,3 +1,8 @@
+2008-04-02  Paul Brook  <paul@codesourcery.com>
+
+	Backport from trunk.
+	* sysdeps/arm/eabi/machine-gmon.h: New file.
+
 2008-04-01  Maxim Kuvyrkov  <maxim@codesourcery.com>
 
 	Backport from trunk.
diff --git a/ports/sysdeps/arm/eabi/machine-gmon.h b/ports/sysdeps/arm/eabi/machine-gmon.h
new file mode 100644
index 000000000..9a819b853
--- /dev/null
+++ b/ports/sysdeps/arm/eabi/machine-gmon.h
@@ -0,0 +1,93 @@
+/* Machine-dependent definitions for profiling support.  ARM EABI version.
+   Copyright (C) 2008 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>
+static void mcount_internal (u_long frompc, u_long selfpc) __attribute_used__;
+
+#define _MCOUNT_DECL(frompc, selfpc) \
+static void mcount_internal (u_long frompc, u_long selfpc)
+
+/* 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.
+   The calling sequence looks something like:
+func:
+   push {lr}
+   bl __gnu_mount_nc
+   <function body>
+ */
+
+
+#define MCOUNT								\
+void __attribute__((__naked__)) __gnu_mcount_nc(void)			\
+{									\
+    asm ("push {r0, r1, r2, r3, lr}\n\t"				\
+	 "bic r1, lr, #1\n\t"						\
+	 "ldr r0, [sp, #20]\n\t"					\
+	 "bl mcount_internal\n\t"					\
+	 "pop {r0, r1, r2, r3, ip, lr}\n\t"				\
+	 "bx ip");							\
+}									\
+OLD_MCOUNT
+
+/* Provide old mcount for backwards compatibility.  This requires
+   code be compiled with APCS frame pointers.  */
+
+#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
+
+#ifdef __thumb2__
+
+#define OLD_MCOUNT							\
+void __attribute__((__naked__)) _mcount (void)				\
+{									\
+  __asm__("push		{r0, r1, r2, r3, fp, lr};"			\
+	  "movs		r0, fp;"					\
+	  "ldrne	r0, [r0, #-4];"					\
+	  "movsne	r1, lr;"					\
+	  "blne		mcount_internal;"				\
+	  "pop		{r0, r1, r2, r3, fp, pc}");			\
+}
+
+#else
+
+#define OLD_MCOUNT							\
+void __attribute__((__naked__)) _mcount (void)				\
+{									\
+  __asm__("stmdb	sp!, {r0, r1, r2, r3, fp, lr};"			\
+	  "movs		fp, fp;"					\
+	  "ldrne	r0, [fp, #-4];"					\
+	  "movnes	r1, lr;"					\
+	  "blne		mcount_internal;"				\
+	  "ldmia	sp!, {r0, r1, r2, r3, fp, lr};"			\
+	  "bx		lr");						\
+}
+
+#endif