2 * Bedbug Functions specific to the MPC603e core
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>
13 #if (CONFIG_COMMANDS & CFG_CMD_BEDBUG) && (defined(CONFIG_MPC824X) || defined(CONFIG_MPC8260))
15 #define MAX_BREAK_POINTS 1
17 extern CPU_DEBUG_CTX bug_ctx;
19 void bedbug603e_init __P((void));
20 void bedbug603e_do_break __P((cmd_tbl_t*,int,int,char*[]));
21 void bedbug603e_break_isr __P((struct pt_regs*));
22 int bedbug603e_find_empty __P((void));
23 int bedbug603e_set __P((int,unsigned long));
24 int bedbug603e_clear __P((int));
27 /* ======================================================================
28 * Initialize the global bug_ctx structure for the processor. Clear all
30 * ====================================================================== */
32 void bedbug603e_init( void )
35 /* -------------------------------------------------- */
37 bug_ctx.hw_debug_enabled = 0;
39 bug_ctx.current_bp = 0;
42 bug_ctx.do_break = bedbug603e_do_break;
43 bug_ctx.break_isr = bedbug603e_break_isr;
44 bug_ctx.find_empty = bedbug603e_find_empty;
45 bug_ctx.set = bedbug603e_set;
46 bug_ctx.clear = bedbug603e_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 the hardware breakpoint for the 603e. 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 bedbug603e_do_break (cmd_tbl_t *cmdtp, int flag, int argc,
68 long addr; /* Address to break at */
69 int which_bp; /* Breakpoint number */
70 /* -------------------------------------------------- */
74 printf ("Usage:\n%s\n", cmdtp->usage);
78 /* Turn off a breakpoint */
80 if( strcmp( argv[ 1 ], "off" ) == 0 )
82 if( bug_ctx.hw_debug_enabled == 0 )
84 puts ( "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 printf( "Breakpoint [%d]: ", which_bp );
107 if( (addr & 0x00000002) == 0 )
108 puts ( "NOT SET\n" );
110 disppc( (unsigned char *)(addr & 0xFFFFFFFC), 0, 1, bedbug_puts, F_RADHEX );
115 /* Set a breakpoint at the address */
117 if(!(( isdigit( argv[ 1 ][ 0 ] )) ||
118 (( argv[ 1 ][ 0 ] >= 'a' ) && ( argv[ 1 ][ 0 ] <= 'f' )) ||
119 (( argv[ 1 ][ 0 ] >= 'A' ) && ( argv[ 1 ][ 0 ] <= 'F' ))))
121 printf ("Usage:\n%s\n", cmdtp->usage);
125 addr = simple_strtoul( argv[ 1 ], NULL, 16 );
127 if(( bug_ctx.set ) && ( which_bp = (*bug_ctx.set)( 0, addr )) > 0 )
129 printf( "Breakpoint [%d]: ", which_bp );
130 disppc( (unsigned char *)addr, 0, 1, bedbug_puts, F_RADHEX );
134 } /* bedbug603e_do_break */
138 /* ======================================================================
139 * Handle a breakpoint. Enter a mini main loop. Stay in the loop until
140 * the stopped flag in the debug context is cleared.
141 * ====================================================================== */
143 void bedbug603e_break_isr( struct pt_regs *regs )
145 unsigned long addr; /* Address stopped at */
146 /* -------------------------------------------------- */
148 bug_ctx.current_bp = 1;
149 addr = GET_IABR() & 0xFFFFFFFC;
151 bedbug_main_loop( addr, regs );
153 } /* bedbug603e_break_isr */
157 /* ======================================================================
158 * See if the hardware breakpoint is available.
159 * ====================================================================== */
161 int bedbug603e_find_empty( void )
163 /* -------------------------------------------------- */
165 if( (GET_IABR() && 0x00000002) == 0 )
169 } /* bedbug603e_find_empty */
173 /* ======================================================================
174 * Set a breakpoint. If 'which_bp' is zero then find an unused breakpoint
175 * number, otherwise reassign the given breakpoint. If hardware debugging
176 * is not enabled, then turn it on via the MSR and DBCR0. Set the break
177 * address in the IABR register.
178 * ====================================================================== */
180 int bedbug603e_set( int which_bp, unsigned long addr )
182 /* -------------------------------------------------- */
184 if(( addr & 0x00000003 ) != 0 )
186 puts ( "Breakpoints must be on a 32 bit boundary\n" );
190 /* Only look if which_bp == 0, else use which_bp */
191 if(( bug_ctx.find_empty ) && ( !which_bp ) &&
192 ( which_bp = (*bug_ctx.find_empty)()) == 0 )
194 puts ( "All breakpoints in use\n" );
198 if( which_bp < 1 || which_bp > MAX_BREAK_POINTS )
200 printf( "Invalid break point # %d\n", which_bp );
204 if( ! bug_ctx.hw_debug_enabled )
206 bug_ctx.hw_debug_enabled = 1;
209 SET_IABR( addr | 0x00000002 );
212 } /* bedbug603e_set */
216 /* ======================================================================
217 * Disable a specific breakoint by setting the IABR register to zero.
218 * ====================================================================== */
220 int bedbug603e_clear( int which_bp )
222 /* -------------------------------------------------- */
224 if( which_bp < 1 || which_bp > MAX_BREAK_POINTS )
226 printf( "Invalid break point # (%d)\n", which_bp );
233 } /* bedbug603e_clear */
236 /* ====================================================================== */