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Diffstat (limited to 'arch/ppc/cpu/mpc8xx/bedbug_860.c')
-rw-r--r--arch/ppc/cpu/mpc8xx/bedbug_860.c316
1 files changed, 316 insertions, 0 deletions
diff --git a/arch/ppc/cpu/mpc8xx/bedbug_860.c b/arch/ppc/cpu/mpc8xx/bedbug_860.c
new file mode 100644
index 0000000..0308bbb
--- /dev/null
+++ b/arch/ppc/cpu/mpc8xx/bedbug_860.c
@@ -0,0 +1,316 @@
+/*
+ * Bedbug Functions specific to the MPC860 chip
+ */
+
+#include <common.h>
+#include <command.h>
+#include <linux/ctype.h>
+#include <bedbug/bedbug.h>
+#include <bedbug/regs.h>
+#include <bedbug/ppc.h>
+#include <bedbug/type.h>
+
+#if defined(CONFIG_CMD_BEDBUG) && defined(CONFIG_8xx)
+
+#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)
+ {
+ cmd_usage(cmdtp);
+ 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 ]))
+ {
+ cmd_usage(cmdtp);
+ 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
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