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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/tile/include/asm/backtrace.h
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/tile/include/asm/backtrace.h')
-rw-r--r--kernel/arch/tile/include/asm/backtrace.h162
1 files changed, 162 insertions, 0 deletions
diff --git a/kernel/arch/tile/include/asm/backtrace.h b/kernel/arch/tile/include/asm/backtrace.h
new file mode 100644
index 000000000..bd5399a69
--- /dev/null
+++ b/kernel/arch/tile/include/asm/backtrace.h
@@ -0,0 +1,162 @@
+/*
+ * Copyright 2010 Tilera Corporation. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, version 2.
+ *
+ * This program 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, GOOD TITLE or
+ * NON INFRINGEMENT. See the GNU General Public License for
+ * more details.
+ */
+
+#ifndef _ASM_TILE_BACKTRACE_H
+#define _ASM_TILE_BACKTRACE_H
+
+#include <linux/types.h>
+
+/* Reads 'size' bytes from 'address' and writes the data to 'result'.
+ * Returns true if successful, else false (e.g. memory not readable).
+ */
+typedef bool (*BacktraceMemoryReader)(void *result,
+ unsigned long address,
+ unsigned int size,
+ void *extra);
+
+typedef struct {
+ /* Current PC. */
+ unsigned long pc;
+
+ /* Current stack pointer value. */
+ unsigned long sp;
+
+ /* Current frame pointer value (i.e. caller's stack pointer) */
+ unsigned long fp;
+
+ /* Internal use only: caller's PC for first frame. */
+ unsigned long initial_frame_caller_pc;
+
+ /* Internal use only: callback to read memory. */
+ BacktraceMemoryReader read_memory_func;
+
+ /* Internal use only: arbitrary argument to read_memory_func. */
+ void *read_memory_func_extra;
+
+} BacktraceIterator;
+
+
+typedef enum {
+
+ /* We have no idea what the caller's pc is. */
+ PC_LOC_UNKNOWN,
+
+ /* The caller's pc is currently in lr. */
+ PC_LOC_IN_LR,
+
+ /* The caller's pc can be found by dereferencing the caller's sp. */
+ PC_LOC_ON_STACK
+
+} CallerPCLocation;
+
+
+typedef enum {
+
+ /* We have no idea what the caller's sp is. */
+ SP_LOC_UNKNOWN,
+
+ /* The caller's sp is currently in r52. */
+ SP_LOC_IN_R52,
+
+ /* The caller's sp can be found by adding a certain constant
+ * to the current value of sp.
+ */
+ SP_LOC_OFFSET
+
+} CallerSPLocation;
+
+
+/* Bit values ORed into CALLER_* values for info ops. */
+enum {
+ /* Setting the low bit on any of these values means the info op
+ * applies only to one bundle ago.
+ */
+ ONE_BUNDLE_AGO_FLAG = 1,
+
+ /* Setting this bit on a CALLER_SP_* value means the PC is in LR.
+ * If not set, PC is on the stack.
+ */
+ PC_IN_LR_FLAG = 2,
+
+ /* This many of the low bits of a CALLER_SP_* value are for the
+ * flag bits above.
+ */
+ NUM_INFO_OP_FLAGS = 2,
+
+ /* We cannot have one in the memory pipe so this is the maximum. */
+ MAX_INFO_OPS_PER_BUNDLE = 2
+};
+
+
+/* Internal constants used to define 'info' operands. */
+enum {
+ /* 0 and 1 are reserved, as are all negative numbers. */
+
+ CALLER_UNKNOWN_BASE = 2,
+
+ CALLER_SP_IN_R52_BASE = 4,
+
+ CALLER_SP_OFFSET_BASE = 8,
+};
+
+
+/* Current backtracer state describing where it thinks the caller is. */
+typedef struct {
+ /*
+ * Public fields
+ */
+
+ /* How do we find the caller's PC? */
+ CallerPCLocation pc_location : 8;
+
+ /* How do we find the caller's SP? */
+ CallerSPLocation sp_location : 8;
+
+ /* If sp_location == SP_LOC_OFFSET, then caller_sp == sp +
+ * loc->sp_offset. Else this field is undefined.
+ */
+ uint16_t sp_offset;
+
+ /* In the most recently visited bundle a terminating bundle? */
+ bool at_terminating_bundle;
+
+ /*
+ * Private fields
+ */
+
+ /* Will the forward scanner see someone clobbering sp
+ * (i.e. changing it with something other than addi sp, sp, N?)
+ */
+ bool sp_clobber_follows;
+
+ /* Operand to next "visible" info op (no more than one bundle past
+ * the next terminating bundle), or -32768 if none.
+ */
+ int16_t next_info_operand;
+
+ /* Is the info of in next_info_op in the very next bundle? */
+ bool is_next_info_operand_adjacent;
+
+} CallerLocation;
+
+extern void backtrace_init(BacktraceIterator *state,
+ BacktraceMemoryReader read_memory_func,
+ void *read_memory_func_extra,
+ unsigned long pc, unsigned long lr,
+ unsigned long sp, unsigned long r52);
+
+
+extern bool backtrace_next(BacktraceIterator *state);
+
+#endif /* _ASM_TILE_BACKTRACE_H */