Initial revision

1 files changed, 318 insertions, 0 deletions

diff --git a/cpu/mpc8xx/bedbug_860.c b/cpu/mpc8xx/bedbug_860.c
new file mode 100644
index 0000000..05590df
--- /dev/null
+++ b/cpu/mpc8xx/bedbug_860.c
@@ -0,0 +1,318 @@
+/*
+ * Bedbug Functions specific to the MPC860 chip
+ */
+
+#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_MPC860)
+
+#define MAX_BREAK_POINTS 2
+
+extern CPU_DEBUG_CTX bug_ctx;
+
+void bedbug860_init __P((void));
+void bedbug860_do_break __P((cmd_tbl_t*,int,int,char*[]));
+void bedbug860_break_isr __P((struct pt_regs*));
+int  bedbug860_find_empty __P((void));
+int  bedbug860_set __P((int,unsigned long));
+int  bedbug860_clear __P((int));
+
+
+/* ======================================================================
+ * Initialize the global bug_ctx structure for the MPC860.  Clear all
+ * of the breakpoints.
+ * ====================================================================== */
+
+void bedbug860_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   = bedbug860_do_break;
+  bug_ctx.break_isr  = bedbug860_break_isr;
+  bug_ctx.find_empty = bedbug860_find_empty;
+  bug_ctx.set        = bedbug860_set;
+  bug_ctx.clear      = bedbug860_clear;
+
+  for( i = 1; i <= MAX_BREAK_POINTS; ++i )
+    (*bug_ctx.clear)( i );
+
+  puts ("BEDBUG:ready\n");
+  return;
+} /* bedbug_init_breakpoints */
+
+
+
+/* ======================================================================
+ * Set/clear/show one of the hardware breakpoints for the 860.  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 bedbug860_do_break (cmd_tbl_t *cmdtp, int flag, int argc,
+                         char *argv[])
+{
+  long		addr = 0;       /* 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 )
+    {
+
+      switch( which_bp )
+      {
+      case 1: addr = GET_CMPA(); break;
+      case 2: addr = GET_CMPB(); break;
+      case 3: addr = GET_CMPC(); break;
+      case 4: addr = GET_CMPD(); break;
+      }
+
+      printf( "Breakpoint [%d]: ", which_bp );
+      if( addr == 0 )
+	printf( "NOT SET\n" );
+      else
+	disppc( (unsigned char *)addr, 0, 1, bedbug_puts, F_RADHEX );
+    }
+    return;
+  }
+
+  /* Set a breakpoint at the address */
+
+  if( !isdigit( argv[ 1 ][ 0 ]))
+  {
+    printf ("Usage:\n%s\n", cmdtp->usage);
+    return;
+  }
+
+  addr = simple_strtoul( argv[ 1 ], NULL, 16 ) & 0xfffffffc;
+
+  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;
+} /* bedbug860_do_break */
+
+
+
+/* ======================================================================
+ * Handle a breakpoint.  First determine which breakpoint was hit by
+ * looking at the DeBug Status Register (DBSR), clear the breakpoint
+ * and enter a mini main loop.  Stay in the loop until the stopped flag
+ * in the debug context is cleared.
+ * ====================================================================== */
+
+void bedbug860_break_isr( struct pt_regs *regs )
+{
+  unsigned long	addr;     /* Address stopped at   */
+  unsigned long	cause;     /* Address stopped at   */
+  /* -------------------------------------------------- */
+
+  cause = GET_ICR();
+
+  if( !(cause & 0x00000004)) {
+    printf( "Not an instruction breakpoint (ICR 0x%08lx)\n", cause );
+    return;
+  }
+
+  addr = regs->nip;
+
+  if( addr == GET_CMPA() )
+  {
+    bug_ctx.current_bp = 1;
+  }
+  else if( addr == GET_CMPB() )
+  {
+    bug_ctx.current_bp = 2;
+  }
+  else if( addr == GET_CMPC() )
+  {
+    bug_ctx.current_bp = 3;
+  }
+  else if( addr == GET_CMPD() )
+  {
+    bug_ctx.current_bp = 4;
+  }
+
+  bedbug_main_loop( addr, regs );
+  return;
+} /* bedbug860_break_isr */
+
+
+
+/* ======================================================================
+ * Look through all of the hardware breakpoints available to see if one
+ * is unused.
+ * ====================================================================== */
+
+int bedbug860_find_empty( void )
+{
+  /* -------------------------------------------------- */
+
+  if( GET_CMPA() == 0 )
+    return 1;
+
+  if( GET_CMPB() == 0 )
+    return 2;
+
+  if( GET_CMPC() == 0 )
+    return 3;
+
+  if( GET_CMPD() == 0 )
+    return 4;
+
+  return 0;
+} /* bedbug860_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 appropriate IACx register and enable proper address
+ * beakpoint in DBCR0.
+ * ====================================================================== */
+
+int bedbug860_set( int which_bp, unsigned long addr )
+{
+  /* -------------------------------------------------- */
+
+  /* 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_DER( GET_DER() | 0x00000004 );
+  }
+
+  switch( which_bp )
+  {
+  case 1:
+    SET_CMPA( addr );
+    SET_ICTRL( GET_ICTRL() | 0x80080800 ); /* CTA=Equal,IW0=Match A,SIW0EN */
+    break;
+
+  case 2:
+    SET_CMPB( addr );
+    SET_ICTRL( GET_ICTRL() | 0x10020400 ); /* CTB=Equal,IW1=Match B,SIW1EN */
+    break;
+
+  case 3:
+    SET_CMPC( addr );
+    SET_ICTRL( GET_ICTRL() | 0x02008200 ); /* CTC=Equal,IW2=Match C,SIW2EN */
+    break;
+
+  case 4:
+    SET_CMPD( addr );
+    SET_ICTRL( GET_ICTRL() | 0x00404100 ); /* CTD=Equal,IW3=Match D,SIW3EN */
+    break;
+  }
+
+  return which_bp;
+} /* bedbug860_set */
+
+
+
+/* ======================================================================
+ * Disable a specific breakoint by setting the appropriate IACx register
+ * to zero and claring the instruction address breakpoint in DBCR0.
+ * ====================================================================== */
+
+int bedbug860_clear( int which_bp )
+{
+  /* -------------------------------------------------- */
+
+  if( which_bp < 1 || which_bp > MAX_BREAK_POINTS )
+  {
+    printf( "Invalid break point # (%d)\n", which_bp );
+    return -1;
+  }
+
+  switch( which_bp )
+  {
+  case 1:
+    SET_CMPA( 0 );
+    SET_ICTRL( GET_ICTRL() & ~0x80080800 ); /* CTA=Equal,IW0=Match A,SIW0EN */
+    break;
+
+  case 2:
+    SET_CMPB( 0 );
+    SET_ICTRL( GET_ICTRL() & ~0x10020400 ); /* CTB=Equal,IW1=Match B,SIW1EN */
+    break;
+
+  case 3:
+    SET_CMPC( 0 );
+    SET_ICTRL( GET_ICTRL() & ~0x02008200 ); /* CTC=Equal,IW2=Match C,SIW2EN */
+    break;
+
+  case 4:
+    SET_CMPD( 0 );
+    SET_ICTRL( GET_ICTRL() & ~0x00404100 ); /* CTD=Equal,IW3=Match D,SIW3EN */
+    break;
+  }
+
+  return 0;
+} /* bedbug860_clear */
+
+
+/* ====================================================================== */
+#endif
+