1 /* Remote debugging interface to Xilinx MicroBlaze.
2
3 Copyright (C) 2009-2013 Free Software Foundation, Inc.
4
5 This file is part of GDB.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19
20 #include "defs.h"
21 #include "gdbcore.h"
22 #include "target.h"
23 #include "monitor.h"
24 #include "gdb_string.h"
25 #include "serial.h"
26 #include "regcache.h"
27
28 void _initialize_picobug_rom (void);
29
30 static char *picobug_inits[] =
31 {"\r", NULL};
32
33 static struct target_ops picobug_ops;
34 static struct monitor_ops picobug_cmds;
35
36 /* Picobug only supports a subset of registers from MCore. In reality,
37 it doesn't support ss1, either. */
38 static char *picobug_regnames[] = {
39 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
40 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
41 0, 0, 0, 0, 0, 0, 0, 0,
42 0, 0, 0, 0, 0, 0, 0, 0,
43 "psr", "vbr", "epsr", "fpsr", "epc", "fpc", 0, "ss1",
44 "ss2", "ss3", "ss4", 0, 0, 0, 0, 0,
45 0, 0, 0, 0, 0, 0, 0, 0,
46 0, 0, 0, 0, 0, 0, 0, 0,
47 "pc" };
48
49
50
51 static void
picobug_open(char * args,int from_tty)52 picobug_open (char *args, int from_tty)
53 {
54 monitor_open (args, &picobug_cmds, from_tty);
55 }
56 /* We choose to write our own dumpregs routine, since the output of
57 the register dumping is rather difficult to encapsulate in a
58 regexp:
59
60 picobug> rd
61 pc 2f00031e epc 2f00031e fpc 00000000
62 psr 80000101 epsr 80000101 fpsr 00000000
63 ss0-ss4 bad0beef 00000000 00000000 00000000 00000000 vbr 30005c00
64 r0-r7 2f0fff4c 00000090 00000001 00000002 00000003 00000004 00000005 00000006
65 r8-r15 2f0fff64 00000000 00000000 00000000 00000000 00000000 00000000 2f00031e
66 */
67
68 static int
picobug_dumpregs(struct regcache * regcache)69 picobug_dumpregs (struct regcache *regcache)
70 {
71 struct gdbarch *gdbarch = get_regcache_arch (regcache);
72 char buf[1024];
73 int resp_len;
74 char *p;
75
76 /* Send the dump register command to the monitor and
77 get the reply. */
78 monitor_printf (picobug_cmds.dump_registers);
79 resp_len = monitor_expect_prompt (buf, sizeof (buf));
80
81 p = strtok (buf, " \t\r\n");
82 while (p)
83 {
84 if (strchr (p, '-'))
85 {
86 /* Got a range. Either r0-r7, r8-r15 or ss0-ss4. */
87 if (strncmp (p, "r0", 2) == 0 || strncmp (p, "r8", 2) == 0)
88 {
89 int rn = (p[1] == '0' ? 0 : 8);
90 int i = 0;
91
92 /* Get the next 8 values and record them. */
93 while (i < 8)
94 {
95 p = strtok (NULL, " \t\r\n");
96 if (p)
97 monitor_supply_register (regcache, rn + i, p);
98 i++;
99 }
100 }
101 else if (strncmp (p, "ss", 2) == 0)
102 {
103 /* Get the next five values, ignoring the first. */
104 int rn;
105 p = strtok (NULL, " \t\r\n");
106 for (rn = 39; rn < 43; rn++)
107 {
108 p = strtok (NULL, " \t\r\n");
109 if (p)
110 monitor_supply_register (regcache, rn, p);
111 }
112 }
113 else
114 {
115 break;
116 }
117 }
118 else
119 {
120 /* Simple register type, paired. */
121 char *name = p;
122 int i;
123
124 /* Get and record value. */
125 p = strtok (NULL, " \t\r\n");
126 if (p)
127 {
128 for (i = 0; i < gdbarch_num_regs (gdbarch); i++)
129 {
130 if (picobug_regnames[i]
131 && strcmp (picobug_regnames[i], name) == 0)
132 break;
133 }
134
135 if (i <= gdbarch_num_regs (gdbarch))
136 monitor_supply_register (regcache, i, p);
137 }
138 }
139 p = strtok (NULL, " \t\r\n");
140 }
141
142 return 0;
143 }
144
145 static void
init_picobug_cmds(void)146 init_picobug_cmds (void)
147 {
148 picobug_cmds.flags = MO_GETMEM_NEEDS_RANGE | MO_CLR_BREAK_USES_ADDR
149 | MO_PRINT_PROGRAM_OUTPUT;
150
151 picobug_cmds.init = picobug_inits; /* Init strings */
152 picobug_cmds.cont = "g\n"; /* continue command */
153 picobug_cmds.step = "s\n"; /* single step */
154 picobug_cmds.set_break = "br %x\n"; /* set a breakpoint */
155 picobug_cmds.clr_break = "nobr %x\n"; /* clear a breakpoint */
156 picobug_cmds.clr_all_break = "nobr\n"; /* clear all breakpoints */
157 picobug_cmds.setmem.cmdb = "mm %x %x ;b\n"; /* setmem.cmdb (addr, value) */
158 picobug_cmds.setmem.cmdw = "mm %x %x ;h\n"; /* setmem.cmdw (addr, value) */
159 picobug_cmds.setmem.cmdl = "mm %x %x ;w\n"; /* setmem.cmdl (addr, value) */
160 picobug_cmds.getmem.cmdb = "md %x %x\n"; /* getmem.cmdb (start addr,
161 end addr) */
162 picobug_cmds.getmem.resp_delim = ":"; /* getmem.resp_delim */
163 picobug_cmds.setreg.cmd = "rm %s %x\n"; /* setreg.cmd (name, value) */
164 picobug_cmds.getreg.cmd = "rd %s\n"; /* getreg.cmd (name) */
165 picobug_cmds.getreg.resp_delim = ":"; /* getreg.resp_delim */
166 picobug_cmds.dump_registers = "rd\n"; /* dump_registers */
167 picobug_cmds.dumpregs = picobug_dumpregs; /* dump registers parser */
168 picobug_cmds.load = "lo\n"; /* download command */
169 picobug_cmds.prompt = "picobug> "; /* monitor command prompt */
170 picobug_cmds.line_term = "\n"; /* end-of-line terminator */
171 picobug_cmds.target = &picobug_ops; /* target operations */
172 picobug_cmds.stopbits = SERIAL_1_STOPBITS; /* number of stop bits */
173 picobug_cmds.regnames = picobug_regnames; /* registers names */
174 picobug_cmds.num_breakpoints = 20; /* number of breakpoints */
175 picobug_cmds.magic = MONITOR_OPS_MAGIC; /* magic */
176 }
177
178 void
_initialize_picobug_rom(void)179 _initialize_picobug_rom (void)
180 {
181 int i;
182
183 /* Initialize m32r RevC monitor target. */
184 init_picobug_cmds ();
185 init_monitor_ops (&picobug_ops);
186 picobug_ops.to_shortname = "picobug";
187 picobug_ops.to_longname = "picobug monitor";
188 picobug_ops.to_doc = "Debug via the picobug monitor.\n\
189 Specify the serial device it is connected to (e.g. /dev/ttya).";
190 picobug_ops.to_open = picobug_open;
191
192 add_target (&picobug_ops);
193 }
194