ARC: DWARF2 .debug_frame based stack unwinder

-Originally written by Rajeshwar Ranga
-Derived off of generic unwinder in 2.6.19 and adapted to ARC

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Cc: Rajeshwar Ranga <rajeshwar.ranga@gmail.com>

2 files changed, 170 insertions, 0 deletions

diff --git a/arch/arc/include/asm/module.h b/arch/arc/include/asm/module.h
index 234b4354e2b3..518222bb3f8e 100644
--- a/arch/arc/include/asm/module.h
+++ b/arch/arc/include/asm/module.h
@@ -14,6 +14,13 @@
 
 #include <asm-generic/module.h>
 
+#ifdef CONFIG_ARC_DW2_UNWIND
+struct mod_arch_specific {
+        void *unw_info;
+        int unw_sec_idx;
+};
+#endif
+
 #define MODULE_PROC_FAMILY "ARC700"
 
 #define MODULE_ARCH_VERMAGIC MODULE_PROC_FAMILY
diff --git a/arch/arc/include/asm/unwind.h b/arch/arc/include/asm/unwind.h
new file mode 100644
index 000000000000..7ca628b6ee2a
--- /dev/null
+++ b/arch/arc/include/asm/unwind.h
@@ -0,0 +1,163 @@
+/*
+ * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _ASM_ARC_UNWIND_H
+#define _ASM_ARC_UNWIND_H
+
+#ifdef CONFIG_ARC_DW2_UNWIND
+
+#include <linux/sched.h>
+
+struct arc700_regs {
+        unsigned long r0;
+        unsigned long r1;
+        unsigned long r2;
+        unsigned long r3;
+        unsigned long r4;
+        unsigned long r5;
+        unsigned long r6;
+        unsigned long r7;
+        unsigned long r8;
+        unsigned long r9;
+        unsigned long r10;
+        unsigned long r11;
+        unsigned long r12;
+        unsigned long r13;
+        unsigned long r14;
+        unsigned long r15;
+        unsigned long r16;
+        unsigned long r17;
+        unsigned long r18;
+        unsigned long r19;
+        unsigned long r20;
+        unsigned long r21;
+        unsigned long r22;
+        unsigned long r23;
+        unsigned long r24;
+        unsigned long r25;
+        unsigned long r26;
+        unsigned long r27;      /* fp */
+        unsigned long r28;      /* sp */
+        unsigned long r29;
+        unsigned long r30;
+        unsigned long r31;      /* blink */
+        unsigned long r63;      /* pc */
+};
+
+struct unwind_frame_info {
+        struct arc700_regs regs;
+        struct task_struct *task;
+        unsigned call_frame:1;
+};
+
+#define UNW_PC(frame)           ((frame)->regs.r63)
+#define UNW_SP(frame)           ((frame)->regs.r28)
+#define UNW_BLINK(frame)        ((frame)->regs.r31)
+
+/* Rajesh FIXME */
+#ifdef CONFIG_FRAME_POINTER
+#define UNW_FP(frame)           ((frame)->regs.r27)
+#define FRAME_RETADDR_OFFSET    4
+#define FRAME_LINK_OFFSET       0
+#define STACK_BOTTOM_UNW(tsk)   STACK_LIMIT((tsk)->thread.ksp)
+#define STACK_TOP_UNW(tsk)      ((tsk)->thread.ksp)
+#else
+#define UNW_FP(frame)           ((void)(frame), 0)
+#endif
+
+#define STACK_LIMIT(ptr)        (((ptr) - 1) & ~(THREAD_SIZE - 1))
+
+#define UNW_REGISTER_INFO \
+        PTREGS_INFO(r0), \
+        PTREGS_INFO(r1), \
+        PTREGS_INFO(r2), \
+        PTREGS_INFO(r3), \
+        PTREGS_INFO(r4), \
+        PTREGS_INFO(r5), \
+        PTREGS_INFO(r6), \
+        PTREGS_INFO(r7), \
+        PTREGS_INFO(r8), \
+        PTREGS_INFO(r9), \
+        PTREGS_INFO(r10), \
+        PTREGS_INFO(r11), \
+        PTREGS_INFO(r12), \
+        PTREGS_INFO(r13), \
+        PTREGS_INFO(r14), \
+        PTREGS_INFO(r15), \
+        PTREGS_INFO(r16), \
+        PTREGS_INFO(r17), \
+        PTREGS_INFO(r18), \
+        PTREGS_INFO(r19), \
+        PTREGS_INFO(r20), \
+        PTREGS_INFO(r21), \
+        PTREGS_INFO(r22), \
+        PTREGS_INFO(r23), \
+        PTREGS_INFO(r24), \
+        PTREGS_INFO(r25), \
+        PTREGS_INFO(r26), \
+        PTREGS_INFO(r27), \
+        PTREGS_INFO(r28), \
+        PTREGS_INFO(r29), \
+        PTREGS_INFO(r30), \
+        PTREGS_INFO(r31), \
+        PTREGS_INFO(r63)
+
+#define UNW_DEFAULT_RA(raItem, dataAlign) \
+        ((raItem).where == Memory && !((raItem).value * (dataAlign) + 4))
+
+extern int arc_unwind(struct unwind_frame_info *frame);
+extern void arc_unwind_init(void);
+extern void arc_unwind_setup(void);
+extern void *unwind_add_table(struct module *module, const void *table_start,
+                              unsigned long table_size);
+extern void unwind_remove_table(void *handle, int init_only);
+
+static inline int
+arch_unwind_init_running(struct unwind_frame_info *info,
+                         int (*callback) (struct unwind_frame_info *info,
+                                          void *arg),
+                         void *arg)
+{
+        return 0;
+}
+
+static inline int arch_unw_user_mode(const struct unwind_frame_info *info)
+{
+        return 0;
+}
+
+static inline void arch_unw_init_blocked(struct unwind_frame_info *info)
+{
+        return;
+}
+
+static inline void arch_unw_init_frame_info(struct unwind_frame_info *info,
+                                            struct pt_regs *regs)
+{
+        return;
+}
+
+#else
+
+#define UNW_PC(frame) ((void)(frame), 0)
+#define UNW_SP(frame) ((void)(frame), 0)
+#define UNW_FP(frame) ((void)(frame), 0)
+
+static inline void arc_unwind_init(void)
+{
+}
+
+static inline void arc_unwind_setup(void)
+{
+}
+#define unwind_add_table(a, b, c)
+#define unwind_remove_table(a, b)
+
+#endif /* CONFIG_ARC_DW2_UNWIND */
+
+#endif /* _ASM_ARC_UNWIND_H */