patch-2.3.43 linux/include/asm-ia64/unwind.h

• Lines: 78
• Date: Sun Feb 6 18:42:40 2000
• Orig file: v2.3.42/linux/include/asm-ia64/unwind.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.42/linux/include/asm-ia64/unwind.h linux/include/asm-ia64/unwind.h
@@ -0,0 +1,77 @@
+#ifndef _ASM_IA64_UNWIND_H
+#define _ASM_IA64_UNWIND_H
+
+/*
+ * Copyright (C) 1999 Hewlett-Packard Co
+ * Copyright (C) 1999 David Mosberger-Tang <davidm@hpl.hp.com>
+ *
+ * A simple API for unwinding kernel stacks.  This is used for
+ * debugging and error reporting purposes.  The kernel doesn't need
+ * full-blown stack unwinding with all the bells and whitles, so there
+ * is not much point in implementing the full IA-64 unwind API (though
+ * it would of course be possible to implement the kernel API on top
+ * of it).
+ */
+
+struct task_struct;	/* forward declaration */
+struct switch_stack;	/* forward declaration */
+
+/*
+ * The following declarations are private to the unwind
+ * implementation:
+ */
+
+struct ia64_stack {
+	unsigned long *limit;
+	unsigned long *top;
+};
+
+/*
+ * No user of this module should every access this structure directly
+ * as it is subject to change.  It is declared here solely so we can
+ * use automatic variables.
+ */
+struct ia64_frame_info {
+	struct ia64_stack regstk;
+	unsigned long *bsp;
+	unsigned long top_rnat;		/* RSE NaT collection at top of backing store */
+	unsigned long cfm;
+	unsigned long ip;		/* instruction pointer */
+};
+
+/*
+ * The official API follows below:
+ */
+
+/*
+ * Prepare to unwind blocked task t.
+ */
+extern void ia64_unwind_init_from_blocked_task (struct ia64_frame_info *info,
+						struct task_struct *t);
+
+/*
+ * Prepare to unwind the current task.  For this to work, the kernel
+ * stack identified by REGS must look like this:
+ *
+ *	//		      //
+ *	|		      |
+ *	|   kernel stack      |
+ *	|		      |
+ *	+=====================+
+ *	|   struct pt_regs    |
+ *	+---------------------+ <--- REGS
+ *	| struct switch_stack |
+ *	+---------------------+
+ */
+extern void ia64_unwind_init_from_current (struct ia64_frame_info *info, struct pt_regs *regs);
+
+/*
+ * Unwind to previous to frame.  Returns 0 if successful, negative
+ * number in case of an error.
+ */
+extern int ia64_unwind_to_previous_frame (struct ia64_frame_info *info);
+
+#define ia64_unwind_get_ip(info)	((info)->ip)
+#define ia64_unwind_get_bsp(info)	((unsigned long) (info)->bsp)
+
+#endif /* _ASM_IA64_UNWIND_H */