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Linux/arch/tile/include/asm/backtrace.h

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  1 /*
  2  * Copyright 2010 Tilera Corporation. All Rights Reserved.
  3  *
  4  *   This program is free software; you can redistribute it and/or
  5  *   modify it under the terms of the GNU General Public License
  6  *   as published by the Free Software Foundation, version 2.
  7  *
  8  *   This program is distributed in the hope that it will be useful, but
  9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
 10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 11  *   NON INFRINGEMENT.  See the GNU General Public License for
 12  *   more details.
 13  */
 14 
 15 #ifndef _ASM_TILE_BACKTRACE_H
 16 #define _ASM_TILE_BACKTRACE_H
 17 
 18 #include <linux/types.h>
 19 
 20 /* Reads 'size' bytes from 'address' and writes the data to 'result'.
 21  * Returns true if successful, else false (e.g. memory not readable).
 22  */
 23 typedef bool (*BacktraceMemoryReader)(void *result,
 24                                       unsigned long address,
 25                                       unsigned int size,
 26                                       void *extra);
 27 
 28 typedef struct {
 29         /* Current PC. */
 30         unsigned long pc;
 31 
 32         /* Current stack pointer value. */
 33         unsigned long sp;
 34 
 35         /* Current frame pointer value (i.e. caller's stack pointer) */
 36         unsigned long fp;
 37 
 38         /* Internal use only: caller's PC for first frame. */
 39         unsigned long initial_frame_caller_pc;
 40 
 41         /* Internal use only: callback to read memory. */
 42         BacktraceMemoryReader read_memory_func;
 43 
 44         /* Internal use only: arbitrary argument to read_memory_func. */
 45         void *read_memory_func_extra;
 46 
 47 } BacktraceIterator;
 48 
 49 
 50 typedef enum {
 51 
 52         /* We have no idea what the caller's pc is. */
 53         PC_LOC_UNKNOWN,
 54 
 55         /* The caller's pc is currently in lr. */
 56         PC_LOC_IN_LR,
 57 
 58         /* The caller's pc can be found by dereferencing the caller's sp. */
 59         PC_LOC_ON_STACK
 60 
 61 } CallerPCLocation;
 62 
 63 
 64 typedef enum {
 65 
 66         /* We have no idea what the caller's sp is. */
 67         SP_LOC_UNKNOWN,
 68 
 69         /* The caller's sp is currently in r52. */
 70         SP_LOC_IN_R52,
 71 
 72         /* The caller's sp can be found by adding a certain constant
 73          * to the current value of sp.
 74          */
 75         SP_LOC_OFFSET
 76 
 77 } CallerSPLocation;
 78 
 79 
 80 /* Bit values ORed into CALLER_* values for info ops. */
 81 enum {
 82         /* Setting the low bit on any of these values means the info op
 83          * applies only to one bundle ago.
 84          */
 85         ONE_BUNDLE_AGO_FLAG = 1,
 86 
 87         /* Setting this bit on a CALLER_SP_* value means the PC is in LR.
 88          * If not set, PC is on the stack.
 89          */
 90         PC_IN_LR_FLAG = 2,
 91 
 92         /* This many of the low bits of a CALLER_SP_* value are for the
 93          * flag bits above.
 94          */
 95         NUM_INFO_OP_FLAGS = 2,
 96 
 97         /* We cannot have one in the memory pipe so this is the maximum. */
 98         MAX_INFO_OPS_PER_BUNDLE = 2
 99 };
100 
101 
102 /* Internal constants used to define 'info' operands. */
103 enum {
104         /* 0 and 1 are reserved, as are all negative numbers. */
105 
106         CALLER_UNKNOWN_BASE = 2,
107 
108         CALLER_SP_IN_R52_BASE = 4,
109 
110         CALLER_SP_OFFSET_BASE = 8,
111 };
112 
113 
114 /* Current backtracer state describing where it thinks the caller is. */
115 typedef struct {
116         /*
117          * Public fields
118          */
119 
120         /* How do we find the caller's PC? */
121         CallerPCLocation pc_location : 8;
122 
123         /* How do we find the caller's SP? */
124         CallerSPLocation sp_location : 8;
125 
126         /* If sp_location == SP_LOC_OFFSET, then caller_sp == sp +
127          * loc->sp_offset. Else this field is undefined.
128          */
129         uint16_t sp_offset;
130 
131         /* In the most recently visited bundle a terminating bundle? */
132         bool at_terminating_bundle;
133 
134         /*
135          * Private fields
136          */
137 
138         /* Will the forward scanner see someone clobbering sp
139          * (i.e. changing it with something other than addi sp, sp, N?)
140          */
141         bool sp_clobber_follows;
142 
143         /* Operand to next "visible" info op (no more than one bundle past
144          * the next terminating bundle), or -32768 if none.
145          */
146         int16_t next_info_operand;
147 
148         /* Is the info of in next_info_op in the very next bundle? */
149         bool is_next_info_operand_adjacent;
150 
151 } CallerLocation;
152 
153 extern void backtrace_init(BacktraceIterator *state,
154                           BacktraceMemoryReader read_memory_func,
155                           void *read_memory_func_extra,
156                           unsigned long pc, unsigned long lr,
157                           unsigned long sp, unsigned long r52);
158 
159 
160 extern bool backtrace_next(BacktraceIterator *state);
161 
162 #endif /* _ASM_TILE_BACKTRACE_H */
163 

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