blob: be09cfb5c6184e8384d2b6d89cc1824055058530 [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>
wdenk8bde7f72003-06-27 21:31:46 +00008#include <bedbug/type.h>
wdenk1dda0b12002-08-27 10:52:29 +00009#include <bedbug/bedbug.h>
10#include <bedbug/regs.h>
11#include <bedbug/ppc.h>
12
13#if (CONFIG_COMMANDS & CFG_CMD_BEDBUG) && (defined(CONFIG_MPC824X) || defined(CONFIG_MPC8260))
14
15#define MAX_BREAK_POINTS 1
16
17extern CPU_DEBUG_CTX bug_ctx;
18
19void bedbug603e_init __P((void));
20void bedbug603e_do_break __P((cmd_tbl_t*,int,int,char*[]));
21void bedbug603e_break_isr __P((struct pt_regs*));
22int bedbug603e_find_empty __P((void));
23int bedbug603e_set __P((int,unsigned long));
24int bedbug603e_clear __P((int));
25
26
27/* ======================================================================
28 * Initialize the global bug_ctx structure for the processor. Clear all
29 * of the breakpoints.
30 * ====================================================================== */
31
32void bedbug603e_init( void )
33{
34 int i;
35 /* -------------------------------------------------- */
36
37 bug_ctx.hw_debug_enabled = 0;
38 bug_ctx.stopped = 0;
39 bug_ctx.current_bp = 0;
40 bug_ctx.regs = NULL;
41
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;
47
48 for( i = 1; i <= MAX_BREAK_POINTS; ++i )
49 (*bug_ctx.clear)( i );
50
51 puts ("BEDBUG:ready\n");
52 return;
53} /* bedbug_init_breakpoints */
54
55
56
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 * ====================================================================== */
64
65void bedbug603e_do_break (cmd_tbl_t *cmdtp, int flag, int argc,
wdenk8bde7f72003-06-27 21:31:46 +000066 char *argv[])
wdenk1dda0b12002-08-27 10:52:29 +000067{
68 long addr; /* Address to break at */
69 int which_bp; /* Breakpoint number */
70 /* -------------------------------------------------- */
71
72 if (argc < 2)
73 {
74 printf ("Usage:\n%s\n", cmdtp->usage);
75 return;
76 }
77
78 /* Turn off a breakpoint */
79
80 if( strcmp( argv[ 1 ], "off" ) == 0 )
81 {
82 if( bug_ctx.hw_debug_enabled == 0 )
83 {
wdenk4b9206e2004-03-23 22:14:11 +000084 puts ( "No breakpoints enabled\n" );
wdenk1dda0b12002-08-27 10:52:29 +000085 return;
86 }
87
88 which_bp = simple_strtoul( argv[ 2 ], NULL, 10 );
89
90 if( bug_ctx.clear )
91 (*bug_ctx.clear)( which_bp );
92
93 printf( "Breakpoint %d removed\n", which_bp );
94 return;
95 }
96
97 /* Show a list of breakpoints */
98
99 if( strcmp( argv[ 1 ], "show" ) == 0 )
100 {
101 for( which_bp = 1; which_bp <= MAX_BREAK_POINTS; ++which_bp )
102 {
103
104 addr = GET_IABR();
105
106 printf( "Breakpoint [%d]: ", which_bp );
107 if( (addr & 0x00000002) == 0 )
wdenk4b9206e2004-03-23 22:14:11 +0000108 puts ( "NOT SET\n" );
wdenk1dda0b12002-08-27 10:52:29 +0000109 else
110 disppc( (unsigned char *)(addr & 0xFFFFFFFC), 0, 1, bedbug_puts, F_RADHEX );
111 }
112 return;
113 }
114
115 /* Set a breakpoint at the address */
116
117 if(!(( isdigit( argv[ 1 ][ 0 ] )) ||
wdenk8bde7f72003-06-27 21:31:46 +0000118 (( argv[ 1 ][ 0 ] >= 'a' ) && ( argv[ 1 ][ 0 ] <= 'f' )) ||
119 (( argv[ 1 ][ 0 ] >= 'A' ) && ( argv[ 1 ][ 0 ] <= 'F' ))))
wdenk1dda0b12002-08-27 10:52:29 +0000120 {
121 printf ("Usage:\n%s\n", cmdtp->usage);
122 return;
123 }
124
125 addr = simple_strtoul( argv[ 1 ], NULL, 16 );
126
127 if(( bug_ctx.set ) && ( which_bp = (*bug_ctx.set)( 0, addr )) > 0 )
128 {
129 printf( "Breakpoint [%d]: ", which_bp );
130 disppc( (unsigned char *)addr, 0, 1, bedbug_puts, F_RADHEX );
131 }
132
133 return;
134} /* bedbug603e_do_break */
135
136
137
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 * ====================================================================== */
142
143void bedbug603e_break_isr( struct pt_regs *regs )
144{
145 unsigned long addr; /* Address stopped at */
146 /* -------------------------------------------------- */
147
148 bug_ctx.current_bp = 1;
149 addr = GET_IABR() & 0xFFFFFFFC;
150
151 bedbug_main_loop( addr, regs );
152 return;
153} /* bedbug603e_break_isr */
154
155
156
157/* ======================================================================
158 * See if the hardware breakpoint is available.
159 * ====================================================================== */
160
161int bedbug603e_find_empty( void )
162{
163 /* -------------------------------------------------- */
164
165 if( (GET_IABR() && 0x00000002) == 0 )
166 return 1;
167
168 return 0;
169} /* bedbug603e_find_empty */
170
171
172
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 * ====================================================================== */
179
180int bedbug603e_set( int which_bp, unsigned long addr )
181{
182 /* -------------------------------------------------- */
183
184 if(( addr & 0x00000003 ) != 0 )
185 {
wdenk4b9206e2004-03-23 22:14:11 +0000186 puts ( "Breakpoints must be on a 32 bit boundary\n" );
wdenk1dda0b12002-08-27 10:52:29 +0000187 return 0;
188 }
189
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 )
193 {
wdenk4b9206e2004-03-23 22:14:11 +0000194 puts ( "All breakpoints in use\n" );
wdenk1dda0b12002-08-27 10:52:29 +0000195 return 0;
196 }
197
198 if( which_bp < 1 || which_bp > MAX_BREAK_POINTS )
199 {
200 printf( "Invalid break point # %d\n", which_bp );
201 return 0;
202 }
203
204 if( ! bug_ctx.hw_debug_enabled )
205 {
206 bug_ctx.hw_debug_enabled = 1;
207 }
208
209 SET_IABR( addr | 0x00000002 );
210
211 return which_bp;
212} /* bedbug603e_set */
213
214
215
216/* ======================================================================
217 * Disable a specific breakoint by setting the IABR register to zero.
218 * ====================================================================== */
219
220int bedbug603e_clear( int which_bp )
221{
222 /* -------------------------------------------------- */
223
224 if( which_bp < 1 || which_bp > MAX_BREAK_POINTS )
225 {
226 printf( "Invalid break point # (%d)\n", which_bp );
227 return -1;
228 }
229
230 SET_IABR( 0 );
231
232 return 0;
233} /* bedbug603e_clear */
234
235
236/* ====================================================================== */
237#endif