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/*
 * 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 */

Filemanager

Name Type Size Permission Actions
Kbuild File 439 B 0644
asm-offsets.h File 35 B 0644
atomic.h File 5.14 KB 0644
atomic_32.h File 8.91 KB 0644
atomic_64.h File 5.51 KB 0644
backtrace.h File 3.98 KB 0644
barrier.h File 2.89 KB 0644
bitops.h File 2.37 KB 0644
bitops_32.h File 4.01 KB 0644
bitops_64.h File 2.67 KB 0644
cache.h File 2.6 KB 0644
cacheflush.h File 4.94 KB 0644
checksum.h File 1.23 KB 0644
cmpxchg.h File 3.47 KB 0644
compat.h File 7.38 KB 0644
current.h File 947 B 0644
delay.h File 1.1 KB 0644
device.h File 978 B 0644
div64.h File 319 B 0644
dma-mapping.h File 1.82 KB 0644
dma.h File 762 B 0644
elf.h File 5.42 KB 0644
fixmap.h File 2.73 KB 0644
ftrace.h File 1.08 KB 0644
futex.h File 4.23 KB 0644
hardirq.h File 1.28 KB 0644
hardwall.h File 1.08 KB 0644
highmem.h File 2.08 KB 0644
homecache.h File 4.21 KB 0644
hugetlb.h File 3.04 KB 0644
hv_driver.h File 1.92 KB 0644
ide.h File 758 B 0644
insn.h File 1.79 KB 0644
io.h File 12.43 KB 0644
irq.h File 3.11 KB 0644
irq_work.h File 283 B 0644
irqflags.h File 10.55 KB 0644
jump_label.h File 1.47 KB 0644
kdebug.h File 769 B 0644
kexec.h File 2.23 KB 0644
kgdb.h File 1.99 KB 0644
kmap_types.h File 1.02 KB 0644
kprobes.h File 2.19 KB 0644
linkage.h File 1.46 KB 0644
mmu.h File 965 B 0644
mmu_context.h File 4.5 KB 0644
mmzone.h File 2.07 KB 0644
module.h File 1.12 KB 0644
page.h File 10.32 KB 0644
pci.h File 6.58 KB 0644
percpu.h File 1.79 KB 0644
perf_event.h File 766 B 0644
pgalloc.h File 4.76 KB 0644
pgtable.h File 15.66 KB 0644
pgtable_32.h File 4.08 KB 0644
pgtable_64.h File 5.11 KB 0644
pmc.h File 2.15 KB 0644
processor.h File 10.62 KB 0644
ptrace.h File 2.96 KB 0644
sections.h File 1.37 KB 0644
setup.h File 1.63 KB 0644
sigframe.h File 956 B 0644
signal.h File 1.07 KB 0644
smp.h File 3.98 KB 0644
spinlock.h File 741 B 0644
spinlock_32.h File 2.9 KB 0644
spinlock_64.h File 3.88 KB 0644
spinlock_types.h File 1.58 KB 0644
stack.h File 2.59 KB 0644
string.h File 1.19 KB 0644
switch_to.h File 2.75 KB 0644
syscall.h File 2.88 KB 0644
syscalls.h File 2.35 KB 0644
thread_info.h File 5.54 KB 0644
tile-desc.h File 650 B 0644
tile-desc_32.h File 12.54 KB 0644
tile-desc_64.h File 10.83 KB 0644
timex.h File 1.71 KB 0644
tlb.h File 878 B 0644
tlbflush.h File 3.99 KB 0644
topology.h File 1.52 KB 0644
traps.h File 2.44 KB 0644
uaccess.h File 12.77 KB 0644
unaligned.h File 1.56 KB 0644
unistd.h File 777 B 0644
user.h File 717 B 0644
vdso.h File 1.84 KB 0644
vga.h File 1.05 KB 0644
word-at-a-time.h File 1.07 KB 0644