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git.ipfire.org Git - thirdparty/u-boot.git/blob - arch/powerpc/cpu/mpc8xx/bedbug_860.c
2 * Bedbug Functions specific to the MPC860 chip
7 #include <linux/ctype.h>
8 #include <bedbug/bedbug.h>
9 #include <bedbug/regs.h>
10 #include <bedbug/ppc.h>
11 #include <bedbug/type.h>
13 #if defined(CONFIG_CMD_BEDBUG) && defined(CONFIG_8xx)
15 #define MAX_BREAK_POINTS 2
17 extern CPU_DEBUG_CTX bug_ctx
;
19 void bedbug860_init
__P((void));
20 void bedbug860_do_break
__P((cmd_tbl_t
*,int,int,char*[]));
21 void bedbug860_break_isr
__P((struct pt_regs
*));
22 int bedbug860_find_empty
__P((void));
23 int bedbug860_set
__P((int,unsigned long));
24 int bedbug860_clear
__P((int));
27 /* ======================================================================
28 * Initialize the global bug_ctx structure for the MPC860. Clear all
30 * ====================================================================== */
32 void bedbug860_init( void )
35 /* -------------------------------------------------- */
37 bug_ctx
.hw_debug_enabled
= 0;
39 bug_ctx
.current_bp
= 0;
42 bug_ctx
.do_break
= bedbug860_do_break
;
43 bug_ctx
.break_isr
= bedbug860_break_isr
;
44 bug_ctx
.find_empty
= bedbug860_find_empty
;
45 bug_ctx
.set
= bedbug860_set
;
46 bug_ctx
.clear
= bedbug860_clear
;
48 for( i
= 1; i
<= MAX_BREAK_POINTS
; ++i
)
49 (*bug_ctx
.clear
)( i
);
51 puts ("BEDBUG:ready\n");
53 } /* bedbug_init_breakpoints */
57 /* ======================================================================
58 * Set/clear/show one of the hardware breakpoints for the 860. The "off"
59 * string will disable a specific breakpoint. The "show" string will
60 * display the current breakpoints. Otherwise an address will set a
61 * breakpoint at that address. Setting a breakpoint uses the CPU-specific
62 * set routine which will assign a breakpoint number.
63 * ====================================================================== */
65 void bedbug860_do_break (cmd_tbl_t
*cmdtp
, int flag
, int argc
,
68 long addr
= 0; /* Address to break at */
69 int which_bp
; /* Breakpoint number */
70 /* -------------------------------------------------- */
78 /* Turn off a breakpoint */
80 if( strcmp( argv
[ 1 ], "off" ) == 0 )
82 if( bug_ctx
.hw_debug_enabled
== 0 )
84 printf( "No breakpoints enabled\n" );
88 which_bp
= simple_strtoul( argv
[ 2 ], NULL
, 10 );
91 (*bug_ctx
.clear
)( which_bp
);
93 printf( "Breakpoint %d removed\n", which_bp
);
97 /* Show a list of breakpoints */
99 if( strcmp( argv
[ 1 ], "show" ) == 0 )
101 for( which_bp
= 1; which_bp
<= MAX_BREAK_POINTS
; ++which_bp
)
106 case 1: addr
= GET_CMPA(); break;
107 case 2: addr
= GET_CMPB(); break;
108 case 3: addr
= GET_CMPC(); break;
109 case 4: addr
= GET_CMPD(); break;
112 printf( "Breakpoint [%d]: ", which_bp
);
114 printf( "NOT SET\n" );
116 disppc( (unsigned char *)addr
, 0, 1, bedbug_puts
, F_RADHEX
);
121 /* Set a breakpoint at the address */
123 if( !isdigit( argv
[ 1 ][ 0 ]))
129 addr
= simple_strtoul( argv
[ 1 ], NULL
, 16 ) & 0xfffffffc;
131 if(( bug_ctx
.set
) && ( which_bp
= (*bug_ctx
.set
)( 0, addr
)) > 0 )
133 printf( "Breakpoint [%d]: ", which_bp
);
134 disppc( (unsigned char *)addr
, 0, 1, bedbug_puts
, F_RADHEX
);
138 } /* bedbug860_do_break */
142 /* ======================================================================
143 * Handle a breakpoint. First determine which breakpoint was hit by
144 * looking at the DeBug Status Register (DBSR), clear the breakpoint
145 * and enter a mini main loop. Stay in the loop until the stopped flag
146 * in the debug context is cleared.
147 * ====================================================================== */
149 void bedbug860_break_isr( struct pt_regs
*regs
)
151 unsigned long addr
; /* Address stopped at */
152 unsigned long cause
; /* Address stopped at */
153 /* -------------------------------------------------- */
157 if( !(cause
& 0x00000004)) {
158 printf( "Not an instruction breakpoint (ICR 0x%08lx)\n", cause
);
164 if( addr
== GET_CMPA() )
166 bug_ctx
.current_bp
= 1;
168 else if( addr
== GET_CMPB() )
170 bug_ctx
.current_bp
= 2;
172 else if( addr
== GET_CMPC() )
174 bug_ctx
.current_bp
= 3;
176 else if( addr
== GET_CMPD() )
178 bug_ctx
.current_bp
= 4;
181 bedbug_main_loop( addr
, regs
);
183 } /* bedbug860_break_isr */
187 /* ======================================================================
188 * Look through all of the hardware breakpoints available to see if one
190 * ====================================================================== */
192 int bedbug860_find_empty( void )
194 /* -------------------------------------------------- */
196 if( GET_CMPA() == 0 )
199 if( GET_CMPB() == 0 )
202 if( GET_CMPC() == 0 )
205 if( GET_CMPD() == 0 )
209 } /* bedbug860_find_empty */
213 /* ======================================================================
214 * Set a breakpoint. If 'which_bp' is zero then find an unused breakpoint
215 * number, otherwise reassign the given breakpoint. If hardware debugging
216 * is not enabled, then turn it on via the MSR and DBCR0. Set the break
217 * address in the appropriate IACx register and enable proper address
218 * beakpoint in DBCR0.
219 * ====================================================================== */
221 int bedbug860_set( int which_bp
, unsigned long addr
)
223 /* -------------------------------------------------- */
225 /* Only look if which_bp == 0, else use which_bp */
226 if(( bug_ctx
.find_empty
) && ( !which_bp
) &&
227 ( which_bp
= (*bug_ctx
.find_empty
)()) == 0 )
229 printf( "All breakpoints in use\n" );
233 if( which_bp
< 1 || which_bp
> MAX_BREAK_POINTS
)
235 printf( "Invalid break point # %d\n", which_bp
);
239 if( ! bug_ctx
.hw_debug_enabled
)
241 bug_ctx
.hw_debug_enabled
= 1;
242 SET_DER( GET_DER() | 0x00000004 );
249 SET_ICTRL( GET_ICTRL() | 0x80080800 ); /* CTA=Equal,IW0=Match A,SIW0EN */
254 SET_ICTRL( GET_ICTRL() | 0x10020400 ); /* CTB=Equal,IW1=Match B,SIW1EN */
259 SET_ICTRL( GET_ICTRL() | 0x02008200 ); /* CTC=Equal,IW2=Match C,SIW2EN */
264 SET_ICTRL( GET_ICTRL() | 0x00404100 ); /* CTD=Equal,IW3=Match D,SIW3EN */
269 } /* bedbug860_set */
273 /* ======================================================================
274 * Disable a specific breakoint by setting the appropriate IACx register
275 * to zero and claring the instruction address breakpoint in DBCR0.
276 * ====================================================================== */
278 int bedbug860_clear( int which_bp
)
280 /* -------------------------------------------------- */
282 if( which_bp
< 1 || which_bp
> MAX_BREAK_POINTS
)
284 printf( "Invalid break point # (%d)\n", which_bp
);
292 SET_ICTRL( GET_ICTRL() & ~0x80080800 ); /* CTA=Equal,IW0=Match A,SIW0EN */
297 SET_ICTRL( GET_ICTRL() & ~0x10020400 ); /* CTB=Equal,IW1=Match B,SIW1EN */
302 SET_ICTRL( GET_ICTRL() & ~0x02008200 ); /* CTC=Equal,IW2=Match C,SIW2EN */
307 SET_ICTRL( GET_ICTRL() & ~0x00404100 ); /* CTD=Equal,IW3=Match D,SIW3EN */
312 } /* bedbug860_clear */
315 /* ====================================================================== */