163 lines
4.0 KiB
C
163 lines
4.0 KiB
C
/*
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*/
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#ifndef _ASM_TILE_BACKTRACE_H
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#define _ASM_TILE_BACKTRACE_H
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#include <linux/types.h>
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/* Reads 'size' bytes from 'address' and writes the data to 'result'.
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* Returns true if successful, else false (e.g. memory not readable).
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*/
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typedef bool (*BacktraceMemoryReader)(void *result,
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unsigned long address,
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unsigned int size,
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void *extra);
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typedef struct {
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/* Current PC. */
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unsigned long pc;
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/* Current stack pointer value. */
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unsigned long sp;
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/* Current frame pointer value (i.e. caller's stack pointer) */
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unsigned long fp;
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/* Internal use only: caller's PC for first frame. */
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unsigned long initial_frame_caller_pc;
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/* Internal use only: callback to read memory. */
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BacktraceMemoryReader read_memory_func;
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/* Internal use only: arbitrary argument to read_memory_func. */
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void *read_memory_func_extra;
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} BacktraceIterator;
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typedef enum {
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/* We have no idea what the caller's pc is. */
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PC_LOC_UNKNOWN,
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/* The caller's pc is currently in lr. */
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PC_LOC_IN_LR,
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/* The caller's pc can be found by dereferencing the caller's sp. */
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PC_LOC_ON_STACK
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} CallerPCLocation;
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typedef enum {
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/* We have no idea what the caller's sp is. */
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SP_LOC_UNKNOWN,
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/* The caller's sp is currently in r52. */
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SP_LOC_IN_R52,
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/* The caller's sp can be found by adding a certain constant
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* to the current value of sp.
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*/
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SP_LOC_OFFSET
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} CallerSPLocation;
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/* Bit values ORed into CALLER_* values for info ops. */
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enum {
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/* Setting the low bit on any of these values means the info op
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* applies only to one bundle ago.
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*/
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ONE_BUNDLE_AGO_FLAG = 1,
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/* Setting this bit on a CALLER_SP_* value means the PC is in LR.
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* If not set, PC is on the stack.
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*/
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PC_IN_LR_FLAG = 2,
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/* This many of the low bits of a CALLER_SP_* value are for the
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* flag bits above.
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*/
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NUM_INFO_OP_FLAGS = 2,
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/* We cannot have one in the memory pipe so this is the maximum. */
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MAX_INFO_OPS_PER_BUNDLE = 2
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};
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/* Internal constants used to define 'info' operands. */
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enum {
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/* 0 and 1 are reserved, as are all negative numbers. */
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CALLER_UNKNOWN_BASE = 2,
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CALLER_SP_IN_R52_BASE = 4,
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CALLER_SP_OFFSET_BASE = 8,
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};
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/* Current backtracer state describing where it thinks the caller is. */
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typedef struct {
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/*
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* Public fields
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*/
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/* How do we find the caller's PC? */
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CallerPCLocation pc_location : 8;
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/* How do we find the caller's SP? */
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CallerSPLocation sp_location : 8;
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/* If sp_location == SP_LOC_OFFSET, then caller_sp == sp +
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* loc->sp_offset. Else this field is undefined.
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*/
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uint16_t sp_offset;
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/* In the most recently visited bundle a terminating bundle? */
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bool at_terminating_bundle;
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/*
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* Private fields
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*/
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/* Will the forward scanner see someone clobbering sp
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* (i.e. changing it with something other than addi sp, sp, N?)
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*/
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bool sp_clobber_follows;
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/* Operand to next "visible" info op (no more than one bundle past
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* the next terminating bundle), or -32768 if none.
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*/
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int16_t next_info_operand;
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/* Is the info of in next_info_op in the very next bundle? */
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bool is_next_info_operand_adjacent;
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} CallerLocation;
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extern void backtrace_init(BacktraceIterator *state,
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BacktraceMemoryReader read_memory_func,
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void *read_memory_func_extra,
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unsigned long pc, unsigned long lr,
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unsigned long sp, unsigned long r52);
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extern bool backtrace_next(BacktraceIterator *state);
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#endif /* _ASM_TILE_BACKTRACE_H */
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