Initial revision

1 files changed, 239 insertions, 0 deletions

diff --git a/cpu/mpc8260/bedbug_603e.c b/cpu/mpc8260/bedbug_603e.c
new file mode 100644
index 0000000..1ca057f
--- /dev/null
+++ b/cpu/mpc8260/bedbug_603e.c
@@ -0,0 +1,239 @@
+/*
+ * Bedbug Functions specific to the MPC603e core
+ */
+
+#include <common.h>
+#include <command.h>
+#include <linux/ctype.h>
+
+#include <cmd_bedbug.h>
+#include <bedbug/bedbug.h>
+#include <bedbug/regs.h>
+#include <bedbug/ppc.h>
+
+#if (CONFIG_COMMANDS & CFG_CMD_BEDBUG) && (defined(CONFIG_MPC824X) || defined(CONFIG_MPC8260))
+
+#define MAX_BREAK_POINTS 1
+
+extern CPU_DEBUG_CTX bug_ctx;
+
+void bedbug603e_init __P((void));
+void bedbug603e_do_break __P((cmd_tbl_t*,int,int,char*[]));
+void bedbug603e_break_isr __P((struct pt_regs*));
+int  bedbug603e_find_empty __P((void));
+int  bedbug603e_set __P((int,unsigned long));
+int  bedbug603e_clear __P((int));
+
+
+/* ======================================================================
+ * Initialize the global bug_ctx structure for the processor.  Clear all
+ * of the breakpoints.
+ * ====================================================================== */
+
+void bedbug603e_init( void )
+{
+  int	i;
+  /* -------------------------------------------------- */
+
+  bug_ctx.hw_debug_enabled = 0;
+  bug_ctx.stopped = 0;
+  bug_ctx.current_bp = 0;
+  bug_ctx.regs = NULL;
+
+  bug_ctx.do_break   = bedbug603e_do_break;
+  bug_ctx.break_isr  = bedbug603e_break_isr;
+  bug_ctx.find_empty = bedbug603e_find_empty;
+  bug_ctx.set        = bedbug603e_set;
+  bug_ctx.clear      = bedbug603e_clear;
+
+  for( i = 1; i <= MAX_BREAK_POINTS; ++i )
+    (*bug_ctx.clear)( i );
+
+  puts ("BEDBUG:ready\n");
+  return;
+} /* bedbug_init_breakpoints */
+
+
+
+/* ======================================================================
+ * Set/clear/show the hardware breakpoint for the 603e.  The "off"
+ * string will disable a specific breakpoint.  The "show" string will
+ * display the current breakpoints.  Otherwise an address will set a
+ * breakpoint at that address.  Setting a breakpoint uses the CPU-specific
+ * set routine which will assign a breakpoint number.
+ * ====================================================================== */
+
+void bedbug603e_do_break (cmd_tbl_t *cmdtp, int flag, int argc,
+                         char *argv[])
+{
+  long		addr;           /* Address to break at  */
+  int		which_bp;       /* Breakpoint number    */
+  /* -------------------------------------------------- */
+
+  if (argc < 2)
+  {
+    printf ("Usage:\n%s\n", cmdtp->usage);
+    return;
+  }
+
+  /* Turn off a breakpoint */
+
+  if( strcmp( argv[ 1 ], "off" ) == 0 )
+  {
+    if( bug_ctx.hw_debug_enabled == 0 )
+    {
+      printf( "No breakpoints enabled\n" );
+      return;
+    }
+
+    which_bp = simple_strtoul( argv[ 2 ], NULL, 10 );
+
+    if( bug_ctx.clear )
+      (*bug_ctx.clear)( which_bp );
+
+    printf( "Breakpoint %d removed\n", which_bp );
+    return;
+  }
+
+  /* Show a list of breakpoints */
+
+  if( strcmp( argv[ 1 ], "show" ) == 0 )
+  {
+    for( which_bp = 1; which_bp <= MAX_BREAK_POINTS; ++which_bp )
+    {
+
+      addr = GET_IABR();
+
+      printf( "Breakpoint [%d]: ", which_bp );
+      if( (addr & 0x00000002) == 0 )
+	printf( "NOT SET\n" );
+      else
+	disppc( (unsigned char *)(addr & 0xFFFFFFFC), 0, 1, bedbug_puts, F_RADHEX );
+    }
+    return;
+  }
+
+  /* Set a breakpoint at the address */
+
+  if(!(( isdigit( argv[ 1 ][ 0 ] )) ||
+        (( argv[ 1 ][ 0 ] >= 'a' ) && ( argv[ 1 ][ 0 ] <= 'f' )) ||
+        (( argv[ 1 ][ 0 ] >= 'A' ) && ( argv[ 1 ][ 0 ] <= 'F' ))))
+  {
+    printf ("Usage:\n%s\n", cmdtp->usage);
+    return;
+  }
+
+  addr = simple_strtoul( argv[ 1 ], NULL, 16 );
+
+  if(( bug_ctx.set ) && ( which_bp = (*bug_ctx.set)( 0, addr )) > 0 )
+  {
+    printf( "Breakpoint [%d]: ", which_bp );
+    disppc( (unsigned char *)addr, 0, 1, bedbug_puts, F_RADHEX );
+  }
+
+  return;
+} /* bedbug603e_do_break */
+
+
+
+/* ======================================================================
+ * Handle a breakpoint.  Enter a mini main loop.  Stay in the loop until
+ * the stopped flag in the debug context is cleared.
+ * ====================================================================== */
+
+void bedbug603e_break_isr( struct pt_regs *regs )
+{
+  unsigned long	addr;           /* Address stopped at   */
+  /* -------------------------------------------------- */
+
+  bug_ctx.current_bp = 1;
+  addr = GET_IABR() & 0xFFFFFFFC;
+
+  bedbug_main_loop( addr, regs );
+  return;
+} /* bedbug603e_break_isr */
+
+
+
+/* ======================================================================
+ * See if the hardware breakpoint is available.
+ * ====================================================================== */
+
+int bedbug603e_find_empty( void )
+{
+  /* -------------------------------------------------- */
+
+  if( (GET_IABR() && 0x00000002) == 0 )
+    return 1;
+
+  return 0;
+} /* bedbug603e_find_empty */
+
+
+
+/* ======================================================================
+ * Set a breakpoint.  If 'which_bp' is zero then find an unused breakpoint
+ * number, otherwise reassign the given breakpoint.  If hardware debugging
+ * is not enabled, then turn it on via the MSR and DBCR0.  Set the break
+ * address in the IABR register.
+ * ====================================================================== */
+
+int bedbug603e_set( int which_bp, unsigned long addr )
+{
+  /* -------------------------------------------------- */
+
+  if(( addr & 0x00000003 ) != 0 )
+  {
+    printf( "Breakpoints must be on a 32 bit boundary\n" );
+    return 0;
+  }
+
+  /* Only look if which_bp == 0, else use which_bp */
+  if(( bug_ctx.find_empty ) && ( !which_bp ) &&
+     ( which_bp = (*bug_ctx.find_empty)()) == 0 )
+  {
+    printf( "All breakpoints in use\n" );
+    return 0;
+  }
+
+  if( which_bp < 1 || which_bp > MAX_BREAK_POINTS )
+  {
+    printf( "Invalid break point # %d\n", which_bp );
+    return 0;
+  }
+
+  if( ! bug_ctx.hw_debug_enabled )
+  {
+    bug_ctx.hw_debug_enabled = 1;
+  }
+
+  SET_IABR( addr | 0x00000002 );
+
+  return which_bp;
+} /* bedbug603e_set */
+
+
+
+/* ======================================================================
+ * Disable a specific breakoint by setting the IABR register to zero.
+ * ====================================================================== */
+
+int bedbug603e_clear( int which_bp )
+{
+  /* -------------------------------------------------- */
+
+  if( which_bp < 1 || which_bp > MAX_BREAK_POINTS )
+  {
+    printf( "Invalid break point # (%d)\n", which_bp );
+    return -1;
+  }
+
+  SET_IABR( 0 );
+
+  return 0;
+} /* bedbug603e_clear */
+
+
+/* ====================================================================== */
+#endif
+