Initial import

1 files changed, 233 insertions, 0 deletions

diff --git a/arch/ia64/include/asm/unwind.h b/arch/ia64/include/asm/unwind.h
new file mode 100644
index 000000000..1af3875f1
--- /dev/null
+++ b/arch/ia64/include/asm/unwind.h
@@ -0,0 +1,233 @@
+#ifndef _ASM_IA64_UNWIND_H
+#define _ASM_IA64_UNWIND_H
+
+/*
+ * Copyright (C) 1999-2000, 2003 Hewlett-Packard Co
+ *	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 */
+
+enum unw_application_register {
+	UNW_AR_BSP,
+	UNW_AR_BSPSTORE,
+	UNW_AR_PFS,
+	UNW_AR_RNAT,
+	UNW_AR_UNAT,
+	UNW_AR_LC,
+	UNW_AR_EC,
+	UNW_AR_FPSR,
+	UNW_AR_RSC,
+	UNW_AR_CCV,
+	UNW_AR_CSD,
+	UNW_AR_SSD
+};
+
+/*
+ * The following declarations are private to the unwind
+ * implementation:
+ */
+
+struct unw_stack {
+	unsigned long limit;
+	unsigned long top;
+};
+
+#define UNW_FLAG_INTERRUPT_FRAME	(1UL << 0)
+
+/*
+ * 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 unw_frame_info {
+	struct unw_stack regstk;
+	struct unw_stack memstk;
+	unsigned int flags;
+	short hint;
+	short prev_script;
+
+	/* current frame info: */
+	unsigned long bsp;		/* backing store pointer value */
+	unsigned long sp;		/* stack pointer value */
+	unsigned long psp;		/* previous sp value */
+	unsigned long ip;		/* instruction pointer value */
+	unsigned long pr;		/* current predicate values */
+	unsigned long *cfm_loc;		/* cfm save location (or NULL) */
+	unsigned long pt;		/* struct pt_regs location */
+
+	struct task_struct *task;
+	struct switch_stack *sw;
+
+	/* preserved state: */
+	unsigned long *bsp_loc;		/* previous bsp save location */
+	unsigned long *bspstore_loc;
+	unsigned long *pfs_loc;
+	unsigned long *rnat_loc;
+	unsigned long *rp_loc;
+	unsigned long *pri_unat_loc;
+	unsigned long *unat_loc;
+	unsigned long *pr_loc;
+	unsigned long *lc_loc;
+	unsigned long *fpsr_loc;
+	struct unw_ireg {
+		unsigned long *loc;
+		struct unw_ireg_nat {
+			unsigned long type : 3;		/* enum unw_nat_type */
+			signed long off : 61;		/* NaT word is at loc+nat.off */
+		} nat;
+	} r4, r5, r6, r7;
+	unsigned long *b1_loc, *b2_loc, *b3_loc, *b4_loc, *b5_loc;
+	struct ia64_fpreg *f2_loc, *f3_loc, *f4_loc, *f5_loc, *fr_loc[16];
+};
+
+/*
+ * The official API follows below:
+ */
+
+struct unw_table_entry {
+	u64 start_offset;
+	u64 end_offset;
+	u64 info_offset;
+};
+
+/*
+ * Initialize unwind support.
+ */
+extern void unw_init (void);
+
+extern void *unw_add_unwind_table (const char *name, unsigned long segment_base, unsigned long gp,
+				   const void *table_start, const void *table_end);
+
+extern void unw_remove_unwind_table (void *handle);
+
+/*
+ * Prepare to unwind blocked task t.
+ */
+extern void unw_init_from_blocked_task (struct unw_frame_info *info, struct task_struct *t);
+
+extern void unw_init_frame_info (struct unw_frame_info *info, struct task_struct *t,
+				 struct switch_stack *sw);
+
+/*
+ * Prepare to unwind the currently running thread.
+ */
+extern void unw_init_running (void (*callback)(struct unw_frame_info *info, void *arg), void *arg);
+
+/*
+ * Unwind to previous to frame.  Returns 0 if successful, negative
+ * number in case of an error.
+ */
+extern int unw_unwind (struct unw_frame_info *info);
+
+/*
+ * Unwind until the return pointer is in user-land (or until an error
+ * occurs).  Returns 0 if successful, negative number in case of
+ * error.
+ */
+extern int unw_unwind_to_user (struct unw_frame_info *info);
+
+#define unw_is_intr_frame(info)	(((info)->flags & UNW_FLAG_INTERRUPT_FRAME) != 0)
+
+static inline int
+unw_get_ip (struct unw_frame_info *info, unsigned long *valp)
+{
+	*valp = (info)->ip;
+	return 0;
+}
+
+static inline int
+unw_get_sp (struct unw_frame_info *info, unsigned long *valp)
+{
+	*valp = (info)->sp;
+	return 0;
+}
+
+static inline int
+unw_get_psp (struct unw_frame_info *info, unsigned long *valp)
+{
+	*valp = (info)->psp;
+	return 0;
+}
+
+static inline int
+unw_get_bsp (struct unw_frame_info *info, unsigned long *valp)
+{
+	*valp = (info)->bsp;
+	return 0;
+}
+
+static inline int
+unw_get_cfm (struct unw_frame_info *info, unsigned long *valp)
+{
+	*valp = *(info)->cfm_loc;
+	return 0;
+}
+
+static inline int
+unw_set_cfm (struct unw_frame_info *info, unsigned long val)
+{
+	*(info)->cfm_loc = val;
+	return 0;
+}
+
+static inline int
+unw_get_rp (struct unw_frame_info *info, unsigned long *val)
+{
+	if (!info->rp_loc)
+		return -1;
+	*val = *info->rp_loc;
+	return 0;
+}
+
+extern int unw_access_gr (struct unw_frame_info *, int, unsigned long *, char *, int);
+extern int unw_access_br (struct unw_frame_info *, int, unsigned long *, int);
+extern int unw_access_fr (struct unw_frame_info *, int, struct ia64_fpreg *, int);
+extern int unw_access_ar (struct unw_frame_info *, int, unsigned long *, int);
+extern int unw_access_pr (struct unw_frame_info *, unsigned long *, int);
+
+static inline int
+unw_set_gr (struct unw_frame_info *i, int n, unsigned long v, char nat)
+{
+	return unw_access_gr(i, n, &v, &nat, 1);
+}
+
+static inline int
+unw_set_br (struct unw_frame_info *i, int n, unsigned long v)
+{
+	return unw_access_br(i, n, &v, 1);
+}
+
+static inline int
+unw_set_fr (struct unw_frame_info *i, int n, struct ia64_fpreg v)
+{
+	return unw_access_fr(i, n, &v, 1);
+}
+
+static inline int
+unw_set_ar (struct unw_frame_info *i, int n, unsigned long v)
+{
+	return unw_access_ar(i, n, &v, 1);
+}
+
+static inline int
+unw_set_pr (struct unw_frame_info *i, unsigned long v)
+{
+	return unw_access_pr(i, &v, 1);
+}
+
+#define unw_get_gr(i,n,v,nat)	unw_access_gr(i,n,v,nat,0)
+#define unw_get_br(i,n,v)	unw_access_br(i,n,v,0)
+#define unw_get_fr(i,n,v)	unw_access_fr(i,n,v,0)
+#define unw_get_ar(i,n,v)	unw_access_ar(i,n,v,0)
+#define unw_get_pr(i,v)		unw_access_pr(i,v,0)
+
+#endif /* _ASM_UNWIND_H */