arch/blackfin/include/asm/trace.h

   1 /*
   2  * header file for hardware trace functions
   3  *
   4  * Copyright 2007-2008 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  */
   8
   9 #ifndef _BLACKFIN_TRACE_
  10 #define _BLACKFIN_TRACE_
  11
  12 /* Normally, we use ON, but you can't turn on software expansion until
  13  * interrupts subsystem is ready
  14  */
  15
  16 #define BFIN_TRACE_INIT ((CONFIG_DEBUG_BFIN_HWTRACE_COMPRESSION << 4) | 0x03)
  17 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
  18 #define BFIN_TRACE_ON   (BFIN_TRACE_INIT | (CONFIG_DEBUG_BFIN_HWTRACE_EXPAND << 2))
  19 #else
  20 #define BFIN_TRACE_ON   (BFIN_TRACE_INIT)
  21 #endif
  22
  23 #ifndef __ASSEMBLY__
  24 extern unsigned long trace_buff_offset;
  25 extern unsigned long software_trace_buff[];
  26 #if defined(CONFIG_DEBUG_VERBOSE)
  27 extern void decode_address(char *buf, unsigned long address);
  28 extern bool get_instruction(unsigned int *val, unsigned short *address);
  29 #else
  30 static inline void decode_address(char *buf, unsigned long address) { }
  31 static inline bool get_instruction(unsigned int *val, unsigned short *address) { return false; }
  32 #endif
  33
  34 /* Trace Macros for C files */
  35
  36 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
  37
  38 #define trace_buffer_init() bfin_write_TBUFCTL(BFIN_TRACE_INIT)
  39
  40 #define trace_buffer_save(x) \
  41         do { \
  42                 (x) = bfin_read_TBUFCTL(); \
  43                 bfin_write_TBUFCTL((x) & ~TBUFEN); \
  44         } while (0)
  45
  46 #define trace_buffer_restore(x) \
  47         do { \
  48                 bfin_write_TBUFCTL((x));        \
  49         } while (0)
  50 #else /* DEBUG_BFIN_HWTRACE_ON */
  51
  52 #define trace_buffer_save(x)
  53 #define trace_buffer_restore(x)
  54 #endif /* CONFIG_DEBUG_BFIN_HWTRACE_ON */
  55
  56 #else
  57 /* Trace Macros for Assembly files */
  58
  59 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
  60
  61 #define trace_buffer_stop(preg, dreg)   \
  62         preg.L = LO(TBUFCTL);           \
  63         preg.H = HI(TBUFCTL);           \
  64         dreg = 0x1;                     \
  65         [preg] = dreg;
  66
  67 #define trace_buffer_init(preg, dreg) \
  68         preg.L = LO(TBUFCTL);         \
  69         preg.H = HI(TBUFCTL);         \
  70         dreg = BFIN_TRACE_INIT;       \
  71         [preg] = dreg;
  72
  73 #define trace_buffer_save(preg, dreg) \
  74         preg.L = LO(TBUFCTL); \
  75         preg.H = HI(TBUFCTL); \
  76         dreg = [preg]; \
  77         [--sp] = dreg; \
  78         dreg = 0x1; \
  79         [preg] = dreg;
  80
  81 #define trace_buffer_restore(preg, dreg) \
  82         preg.L = LO(TBUFCTL); \
  83         preg.H = HI(TBUFCTL); \
  84         dreg = [sp++]; \
  85         [preg] = dreg;
  86
  87 #else /* CONFIG_DEBUG_BFIN_HWTRACE_ON */
  88
  89 #define trace_buffer_stop(preg, dreg)
  90 #define trace_buffer_init(preg, dreg)
  91 #define trace_buffer_save(preg, dreg)
  92 #define trace_buffer_restore(preg, dreg)
  93
  94 #endif /* CONFIG_DEBUG_BFIN_HWTRACE_ON */
  95
  96 #ifdef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
  97 # define DEBUG_HWTRACE_SAVE(preg, dreg)    trace_buffer_save(preg, dreg)
  98 # define DEBUG_HWTRACE_RESTORE(preg, dreg) trace_buffer_restore(preg, dreg)
  99 #else
 100 # define DEBUG_HWTRACE_SAVE(preg, dreg)
 101 # define DEBUG_HWTRACE_RESTORE(preg, dreg)
 102 #endif
 103
 104 #endif /* __ASSEMBLY__ */
 105
 106 #endif                          /* _BLACKFIN_TRACE_ */