blob: 1ca057f7328b49a731a595df43dad052ff43a5bd [file] [log] [blame]
wdenk1dda0b12002-08-27 10:52:29 +00001/*
2 * Bedbug Functions specific to the MPC603e core
3 */
4
5#include <common.h>
6#include <command.h>
7#include <linux/ctype.h>
8
9#include <cmd_bedbug.h>
10#include <bedbug/bedbug.h>
11#include <bedbug/regs.h>
12#include <bedbug/ppc.h>
13
14#if (CONFIG_COMMANDS & CFG_CMD_BEDBUG) && (defined(CONFIG_MPC824X) || defined(CONFIG_MPC8260))
15
16#define MAX_BREAK_POINTS 1
17
18extern CPU_DEBUG_CTX bug_ctx;
19
20void bedbug603e_init __P((void));
21void bedbug603e_do_break __P((cmd_tbl_t*,int,int,char*[]));
22void bedbug603e_break_isr __P((struct pt_regs*));
23int bedbug603e_find_empty __P((void));
24int bedbug603e_set __P((int,unsigned long));
25int bedbug603e_clear __P((int));
26
27
28/* ======================================================================
29 * Initialize the global bug_ctx structure for the processor. Clear all
30 * of the breakpoints.
31 * ====================================================================== */
32
33void 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
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
66void bedbug603e_do_break (cmd_tbl_t *cmdtp, int flag, int argc,
67 char *argv[])
68{
69 long addr; /* Address to break at */
70 int which_bp; /* Breakpoint number */
71 /* -------------------------------------------------- */
72
73 if (argc < 2)
74 {
75 printf ("Usage:\n%s\n", cmdtp->usage);
76 return;
77 }
78
79 /* Turn off a breakpoint */
80
81 if( strcmp( argv[ 1 ], "off" ) == 0 )
82 {
83 if( bug_ctx.hw_debug_enabled == 0 )
84 {
85 printf( "No breakpoints enabled\n" );
86 return;
87 }
88
89 which_bp = simple_strtoul( argv[ 2 ], NULL, 10 );
90
91 if( bug_ctx.clear )
92 (*bug_ctx.clear)( which_bp );
93
94 printf( "Breakpoint %d removed\n", which_bp );
95 return;
96 }
97
98 /* Show a list of breakpoints */
99
100 if( strcmp( argv[ 1 ], "show" ) == 0 )
101 {
102 for( which_bp = 1; which_bp <= MAX_BREAK_POINTS; ++which_bp )
103 {
104
105 addr = GET_IABR();
106
107 printf( "Breakpoint [%d]: ", which_bp );
108 if( (addr & 0x00000002) == 0 )
109 printf( "NOT SET\n" );
110 else
111 disppc( (unsigned char *)(addr & 0xFFFFFFFC), 0, 1, bedbug_puts, F_RADHEX );
112 }
113 return;
114 }
115
116 /* Set a breakpoint at the address */
117
118 if(!(( isdigit( argv[ 1 ][ 0 ] )) ||
119 (( argv[ 1 ][ 0 ] >= 'a' ) && ( argv[ 1 ][ 0 ] <= 'f' )) ||
120 (( argv[ 1 ][ 0 ] >= 'A' ) && ( argv[ 1 ][ 0 ] <= 'F' ))))
121 {
122 printf ("Usage:\n%s\n", cmdtp->usage);
123 return;
124 }
125
126 addr = simple_strtoul( argv[ 1 ], NULL, 16 );
127
128 if(( bug_ctx.set ) && ( which_bp = (*bug_ctx.set)( 0, addr )) > 0 )
129 {
130 printf( "Breakpoint [%d]: ", which_bp );
131 disppc( (unsigned char *)addr, 0, 1, bedbug_puts, F_RADHEX );
132 }
133
134 return;
135} /* bedbug603e_do_break */
136
137
138
139/* ======================================================================
140 * Handle a breakpoint. Enter a mini main loop. Stay in the loop until
141 * the stopped flag in the debug context is cleared.
142 * ====================================================================== */
143
144void bedbug603e_break_isr( struct pt_regs *regs )
145{
146 unsigned long addr; /* Address stopped at */
147 /* -------------------------------------------------- */
148
149 bug_ctx.current_bp = 1;
150 addr = GET_IABR() & 0xFFFFFFFC;
151
152 bedbug_main_loop( addr, regs );
153 return;
154} /* bedbug603e_break_isr */
155
156
157
158/* ======================================================================
159 * See if the hardware breakpoint is available.
160 * ====================================================================== */
161
162int bedbug603e_find_empty( void )
163{
164 /* -------------------------------------------------- */
165
166 if( (GET_IABR() && 0x00000002) == 0 )
167 return 1;
168
169 return 0;
170} /* bedbug603e_find_empty */
171
172
173
174/* ======================================================================
175 * Set a breakpoint. If 'which_bp' is zero then find an unused breakpoint
176 * number, otherwise reassign the given breakpoint. If hardware debugging
177 * is not enabled, then turn it on via the MSR and DBCR0. Set the break
178 * address in the IABR register.
179 * ====================================================================== */
180
181int bedbug603e_set( int which_bp, unsigned long addr )
182{
183 /* -------------------------------------------------- */
184
185 if(( addr & 0x00000003 ) != 0 )
186 {
187 printf( "Breakpoints must be on a 32 bit boundary\n" );
188 return 0;
189 }
190
191 /* Only look if which_bp == 0, else use which_bp */
192 if(( bug_ctx.find_empty ) && ( !which_bp ) &&
193 ( which_bp = (*bug_ctx.find_empty)()) == 0 )
194 {
195 printf( "All breakpoints in use\n" );
196 return 0;
197 }
198
199 if( which_bp < 1 || which_bp > MAX_BREAK_POINTS )
200 {
201 printf( "Invalid break point # %d\n", which_bp );
202 return 0;
203 }
204
205 if( ! bug_ctx.hw_debug_enabled )
206 {
207 bug_ctx.hw_debug_enabled = 1;
208 }
209
210 SET_IABR( addr | 0x00000002 );
211
212 return which_bp;
213} /* bedbug603e_set */
214
215
216
217/* ======================================================================
218 * Disable a specific breakoint by setting the IABR register to zero.
219 * ====================================================================== */
220
221int bedbug603e_clear( int which_bp )
222{
223 /* -------------------------------------------------- */
224
225 if( which_bp < 1 || which_bp > MAX_BREAK_POINTS )
226 {
227 printf( "Invalid break point # (%d)\n", which_bp );
228 return -1;
229 }
230
231 SET_IABR( 0 );
232
233 return 0;
234} /* bedbug603e_clear */
235
236
237/* ====================================================================== */
238#endif
239