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cmd_usage(): simplify return code handling
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1 /*
2 * Bedbug Functions specific to the MPC603e core
3 */
4
5 #include <common.h>
6 #include <command.h>
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>
12
13 #if defined(CONFIG_CMD_BEDBUG) \
14 && (defined(CONFIG_MPC824X) || defined(CONFIG_MPC8260))
15
16 #define MAX_BREAK_POINTS 1
17
18 extern CPU_DEBUG_CTX bug_ctx;
19
20 void bedbug603e_init __P((void));
21 void bedbug603e_do_break __P((cmd_tbl_t*,int,int,char*const[]));
22 void bedbug603e_break_isr __P((struct pt_regs*));
23 int bedbug603e_find_empty __P((void));
24 int bedbug603e_set __P((int,unsigned long));
25 int bedbug603e_clear __P((int));
26
27 \f
28 /* ======================================================================
29 * Initialize the global bug_ctx structure for the processor. Clear all
30 * of the breakpoints.
31 * ====================================================================== */
32
33 void bedbug603e_init( void )
34 {
35 int i;
36 /* -------------------------------------------------- */
37
38 bug_ctx.hw_debug_enabled = 0;
39 bug_ctx.stopped = 0;
40 bug_ctx.current_bp = 0;
41 bug_ctx.regs = NULL;
42
43 bug_ctx.do_break = bedbug603e_do_break;
44 bug_ctx.break_isr = bedbug603e_break_isr;
45 bug_ctx.find_empty = bedbug603e_find_empty;
46 bug_ctx.set = bedbug603e_set;
47 bug_ctx.clear = bedbug603e_clear;
48
49 for( i = 1; i <= MAX_BREAK_POINTS; ++i )
50 (*bug_ctx.clear)( i );
51
52 puts ("BEDBUG:ready\n");
53 return;
54 } /* bedbug_init_breakpoints */
55
56
57 \f
58 /* ======================================================================
59 * Set/clear/show the hardware breakpoint for the 603e. The "off"
60 * string will disable a specific breakpoint. The "show" string will
61 * display the current breakpoints. Otherwise an address will set a
62 * breakpoint at that address. Setting a breakpoint uses the CPU-specific
63 * set routine which will assign a breakpoint number.
64 * ====================================================================== */
65
66 void bedbug603e_do_break (cmd_tbl_t *cmdtp, int flag, int argc,
67 char * const argv[])
68 {
69 long addr; /* Address to break at */
70 int which_bp; /* Breakpoint number */
71 /* -------------------------------------------------- */
72
73 if (argc < 2)
74 return cmd_usage(cmdtp);
75
76 /* Turn off a breakpoint */
77
78 if( strcmp( argv[ 1 ], "off" ) == 0 )
79 {
80 if( bug_ctx.hw_debug_enabled == 0 )
81 {
82 puts ( "No breakpoints enabled\n" );
83 return;
84 }
85
86 which_bp = simple_strtoul( argv[ 2 ], NULL, 10 );
87
88 if( bug_ctx.clear )
89 (*bug_ctx.clear)( which_bp );
90
91 printf( "Breakpoint %d removed\n", which_bp );
92 return;
93 }
94
95 /* Show a list of breakpoints */
96
97 if( strcmp( argv[ 1 ], "show" ) == 0 )
98 {
99 for( which_bp = 1; which_bp <= MAX_BREAK_POINTS; ++which_bp )
100 {
101
102 addr = GET_IABR();
103
104 printf( "Breakpoint [%d]: ", which_bp );
105 if( (addr & 0x00000002) == 0 )
106 puts ( "NOT SET\n" );
107 else
108 disppc( (unsigned char *)(addr & 0xFFFFFFFC), 0, 1, bedbug_puts, F_RADHEX );
109 }
110 return;
111 }
112
113 /* Set a breakpoint at the address */
114
115 if(!(( isdigit( argv[ 1 ][ 0 ] )) ||
116 (( argv[ 1 ][ 0 ] >= 'a' ) && ( argv[ 1 ][ 0 ] <= 'f' )) ||
117 (( argv[ 1 ][ 0 ] >= 'A' ) && ( argv[ 1 ][ 0 ] <= 'F' ))))
118 return cmd_usage(cmdtp);
119
120 addr = simple_strtoul( argv[ 1 ], NULL, 16 );
121
122 if(( bug_ctx.set ) && ( which_bp = (*bug_ctx.set)( 0, addr )) > 0 )
123 {
124 printf( "Breakpoint [%d]: ", which_bp );
125 disppc( (unsigned char *)addr, 0, 1, bedbug_puts, F_RADHEX );
126 }
127
128 return;
129 } /* bedbug603e_do_break */
130
131
132 \f
133 /* ======================================================================
134 * Handle a breakpoint. Enter a mini main loop. Stay in the loop until
135 * the stopped flag in the debug context is cleared.
136 * ====================================================================== */
137
138 void bedbug603e_break_isr( struct pt_regs *regs )
139 {
140 unsigned long addr; /* Address stopped at */
141 /* -------------------------------------------------- */
142
143 bug_ctx.current_bp = 1;
144 addr = GET_IABR() & 0xFFFFFFFC;
145
146 bedbug_main_loop( addr, regs );
147 return;
148 } /* bedbug603e_break_isr */
149
150
151 \f
152 /* ======================================================================
153 * See if the hardware breakpoint is available.
154 * ====================================================================== */
155
156 int bedbug603e_find_empty( void )
157 {
158 /* -------------------------------------------------- */
159
160 if( (GET_IABR() && 0x00000002) == 0 )
161 return 1;
162
163 return 0;
164 } /* bedbug603e_find_empty */
165
166
167 \f
168 /* ======================================================================
169 * Set a breakpoint. If 'which_bp' is zero then find an unused breakpoint
170 * number, otherwise reassign the given breakpoint. If hardware debugging
171 * is not enabled, then turn it on via the MSR and DBCR0. Set the break
172 * address in the IABR register.
173 * ====================================================================== */
174
175 int bedbug603e_set( int which_bp, unsigned long addr )
176 {
177 /* -------------------------------------------------- */
178
179 if(( addr & 0x00000003 ) != 0 )
180 {
181 puts ( "Breakpoints must be on a 32 bit boundary\n" );
182 return 0;
183 }
184
185 /* Only look if which_bp == 0, else use which_bp */
186 if(( bug_ctx.find_empty ) && ( !which_bp ) &&
187 ( which_bp = (*bug_ctx.find_empty)()) == 0 )
188 {
189 puts ( "All breakpoints in use\n" );
190 return 0;
191 }
192
193 if( which_bp < 1 || which_bp > MAX_BREAK_POINTS )
194 {
195 printf( "Invalid break point # %d\n", which_bp );
196 return 0;
197 }
198
199 if( ! bug_ctx.hw_debug_enabled )
200 {
201 bug_ctx.hw_debug_enabled = 1;
202 }
203
204 SET_IABR( addr | 0x00000002 );
205
206 return which_bp;
207 } /* bedbug603e_set */
208
209
210 \f
211 /* ======================================================================
212 * Disable a specific breakoint by setting the IABR register to zero.
213 * ====================================================================== */
214
215 int bedbug603e_clear( int which_bp )
216 {
217 /* -------------------------------------------------- */
218
219 if( which_bp < 1 || which_bp > MAX_BREAK_POINTS )
220 {
221 printf( "Invalid break point # (%d)\n", which_bp );
222 return -1;
223 }
224
225 SET_IABR( 0 );
226
227 return 0;
228 } /* bedbug603e_clear */
229
230
231 /* ====================================================================== */
232 #endif