cpu/mpc8260/bedbug_603e.c

   1 /*
   2  * Bedbug Functions specific to the MPC603e core
   3  */
   4
   5 #include <common.h>
   6 #include <command.h>
   7 #include <linux/ctype.h>
   8 #include <bedbug/type.h>
   9 #include <bedbug/bedbug.h>
  10 #include <bedbug/regs.h>
  11 #include <bedbug/ppc.h>
  12
  13 #if defined(CONFIG_CMD_BEDBUG) \
  14         && (defined(CONFIG_MPC824X) || defined(CONFIG_MPC8260))
  15
  16 #define MAX_BREAK_POINTS 1
  17
  18 extern CPU_DEBUG_CTX bug_ctx;
  19
  20 void bedbug603e_init __P((void));
  21 void bedbug603e_do_break __P((cmd_tbl_t*,int,int,char*[]));
  22 void bedbug603e_break_isr __P((struct pt_regs*));
  23 int  bedbug603e_find_empty __P((void));
  24 int  bedbug603e_set __P((int,unsigned long));
  25 int  bedbug603e_clear __P((int));
  26
  27 \f
  28 /* ======================================================================
  29  * Initialize the global bug_ctx structure for the processor.  Clear all
  30  * of the breakpoints.
  31  * ====================================================================== */
  32
  33 void bedbug603e_init( void )
  34 {
  35   int   i;
  36   /* -------------------------------------------------- */
  37
  38   bug_ctx.hw_debug_enabled = 0;
  39   bug_ctx.stopped = 0;
  40   bug_ctx.current_bp = 0;
  41   bug_ctx.regs = NULL;
  42
  43   bug_ctx.do_break   = bedbug603e_do_break;
  44   bug_ctx.break_isr  = bedbug603e_break_isr;
  45   bug_ctx.find_empty = bedbug603e_find_empty;
  46   bug_ctx.set        = bedbug603e_set;
  47   bug_ctx.clear      = bedbug603e_clear;
  48
  49   for( i = 1; i <= MAX_BREAK_POINTS; ++i )
  50     (*bug_ctx.clear)( i );
  51
  52   puts ("BEDBUG:ready\n");
  53   return;
  54 } /* bedbug_init_breakpoints */
  55
  56
  57 \f
  58 /* ======================================================================
  59  * Set/clear/show the hardware breakpoint for the 603e.  The "off"
  60  * string will disable a specific breakpoint.  The "show" string will
  61  * display the current breakpoints.  Otherwise an address will set a
  62  * breakpoint at that address.  Setting a breakpoint uses the CPU-specific
  63  * set routine which will assign a breakpoint number.
  64  * ====================================================================== */
  65
  66 void bedbug603e_do_break (cmd_tbl_t *cmdtp, int flag, int argc,
  67                          char *argv[])
  68 {
  69   long          addr;           /* Address to break at  */
  70   int           which_bp;       /* Breakpoint number    */
  71   /* -------------------------------------------------- */
  72
  73   if (argc < 2)
  74   {
  75     cmd_usage(cmdtp);
  76     return;
  77   }
  78
  79   /* Turn off a breakpoint */
  80
  81   if( strcmp( argv[ 1 ], "off" ) == 0 )
  82   {
  83     if( bug_ctx.hw_debug_enabled == 0 )
  84     {
  85       puts ( "No breakpoints enabled\n" );
  86       return;
  87     }
  88
  89     which_bp = simple_strtoul( argv[ 2 ], NULL, 10 );
  90
  91     if( bug_ctx.clear )
  92       (*bug_ctx.clear)( which_bp );
  93
  94     printf( "Breakpoint %d removed\n", which_bp );
  95     return;
  96   }
  97
  98   /* Show a list of breakpoints */
  99
 100   if( strcmp( argv[ 1 ], "show" ) == 0 )
 101   {
 102     for( which_bp = 1; which_bp <= MAX_BREAK_POINTS; ++which_bp )
 103     {
 104
 105       addr = GET_IABR();
 106
 107       printf( "Breakpoint [%d]: ", which_bp );
 108       if( (addr & 0x00000002) == 0 )
 109         puts ( "NOT SET\n" );
 110       else
 111         disppc( (unsigned char *)(addr & 0xFFFFFFFC), 0, 1, bedbug_puts, F_RADHEX );
 112     }
 113     return;
 114   }
 115
 116   /* Set a breakpoint at the address */
 117
 118   if(!(( isdigit( argv[ 1 ][ 0 ] )) ||
 119         (( argv[ 1 ][ 0 ] >= 'a' ) && ( argv[ 1 ][ 0 ] <= 'f' )) ||
 120         (( argv[ 1 ][ 0 ] >= 'A' ) && ( argv[ 1 ][ 0 ] <= 'F' ))))
 121   {
 122     cmd_usage(cmdtp);
 123     return;
 124   }
 125
 126   addr = simple_strtoul( argv[ 1 ], NULL, 16 );
 127
 128   if(( bug_ctx.set ) && ( which_bp = (*bug_ctx.set)( 0, addr )) > 0 )
 129   {
 130     printf( "Breakpoint [%d]: ", which_bp );
 131     disppc( (unsigned char *)addr, 0, 1, bedbug_puts, F_RADHEX );
 132   }
 133
 134   return;
 135 } /* bedbug603e_do_break */
 136
 137
 138 \f
 139 /* ======================================================================
 140  * Handle a breakpoint.  Enter a mini main loop.  Stay in the loop until
 141  * the stopped flag in the debug context is cleared.
 142  * ====================================================================== */
 143
 144 void bedbug603e_break_isr( struct pt_regs *regs )
 145 {
 146   unsigned long addr;           /* Address stopped at   */
 147   /* -------------------------------------------------- */
 148
 149   bug_ctx.current_bp = 1;
 150   addr = GET_IABR() & 0xFFFFFFFC;
 151
 152   bedbug_main_loop( addr, regs );
 153   return;
 154 } /* bedbug603e_break_isr */
 155
 156
 157 \f
 158 /* ======================================================================
 159  * See if the hardware breakpoint is available.
 160  * ====================================================================== */
 161
 162 int bedbug603e_find_empty( void )
 163 {
 164   /* -------------------------------------------------- */
 165
 166   if( (GET_IABR() && 0x00000002) == 0 )
 167     return 1;
 168
 169   return 0;
 170 } /* bedbug603e_find_empty */
 171
 172
 173 \f
 174 /* ======================================================================
 175  * Set a breakpoint.  If 'which_bp' is zero then find an unused breakpoint
 176  * number, otherwise reassign the given breakpoint.  If hardware debugging
 177  * is not enabled, then turn it on via the MSR and DBCR0.  Set the break
 178  * address in the IABR register.
 179  * ====================================================================== */
 180
 181 int bedbug603e_set( int which_bp, unsigned long addr )
 182 {
 183   /* -------------------------------------------------- */
 184
 185   if(( addr & 0x00000003 ) != 0 )
 186   {
 187     puts ( "Breakpoints must be on a 32 bit boundary\n" );
 188     return 0;
 189   }
 190
 191   /* Only look if which_bp == 0, else use which_bp */
 192   if(( bug_ctx.find_empty ) && ( !which_bp ) &&
 193      ( which_bp = (*bug_ctx.find_empty)()) == 0 )
 194   {
 195     puts ( "All breakpoints in use\n" );
 196     return 0;
 197   }
 198
 199   if( which_bp < 1 || which_bp > MAX_BREAK_POINTS )
 200   {
 201     printf( "Invalid break point # %d\n", which_bp );
 202     return 0;
 203   }
 204
 205   if( ! bug_ctx.hw_debug_enabled )
 206   {
 207     bug_ctx.hw_debug_enabled = 1;
 208   }
 209
 210   SET_IABR( addr | 0x00000002 );
 211
 212   return which_bp;
 213 } /* bedbug603e_set */
 214
 215
 216 \f
 217 /* ======================================================================
 218  * Disable a specific breakoint by setting the IABR register to zero.
 219  * ====================================================================== */
 220
 221 int bedbug603e_clear( int which_bp )
 222 {
 223   /* -------------------------------------------------- */
 224
 225   if( which_bp < 1 || which_bp > MAX_BREAK_POINTS )
 226   {
 227     printf( "Invalid break point # (%d)\n", which_bp );
 228     return -1;
 229   }
 230
 231   SET_IABR( 0 );
 232
 233   return 0;
 234 } /* bedbug603e_clear */
 235
 236
 237 /* ====================================================================== */
 238 #endif