[PATCH] i386: Redo semaphore and rwlock assembly helpers

- Move them to a pure assembly file. Previously they were in
a C file that only consisted of inline assembly. Doing it in pure
assembler is much nicer.
- Add a frame.i include with FRAME/ENDFRAME macros to easily
add frame pointers to assembly functions
- Add dwarf2 annotation to them so that the new dwarf2 unwinder
doesn't get stuck on them
- Random cleanups

Includes feedback from Jan Beulich and a UML build fix from Andrew
Morton.

Cc: jbeulich@novell.com
Cc: jdike@addtoit.com
Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 24 insertions, 0 deletions

diff --git a/include/asm-i386/frame.i b/include/asm-i386/frame.i
new file mode 100644
index 000000000000..4d68ddce18b6
--- /dev/null
+++ b/include/asm-i386/frame.i
@@ -0,0 +1,24 @@
+#include <linux/config.h>
+#include <asm/dwarf2.h>
+
+/* The annotation hides the frame from the unwinder and makes it look
+   like a ordinary ebp save/restore. This avoids some special cases for
+   frame pointer later */
+#ifdef CONFIG_FRAME_POINTER
+        .macro FRAME
+        pushl %ebp
+        CFI_ADJUST_CFA_OFFSET 4
+        CFI_REL_OFFSET ebp,0
+        movl %esp,%ebp
+        .endm
+        .macro ENDFRAME
+        popl %ebp
+        CFI_ADJUST_CFA_OFFSET -4
+        CFI_RESTORE ebp
+        .endm
+#else
+        .macro FRAME
+        .endm
+        .macro ENDFRAME
+        .endm
+#endif