1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <assert.h>
#include "src/pdbgproxy.h"
%%{
machine gdb;
action reset {
cmd = 0;
rsp = NULL;
data = stack;
memset(stack, 0, sizeof(stack));
crc = 0;
}
action crc {
crc += *p;
}
action push {
data++;
assert(data < &stack[10]);
}
action hex_digit {
*data *= 16;
if (*p >= '0' && *p <= '9')
*data += *p - '0';
else if (*p >= 'a' && *p <= 'f')
*data += *p - 'a' + 10;
else if (*p >= 'A' && *p <= 'F')
*data += *p - 'A' + 10;
}
action end {
/* *data should point to the CRC */
if (crc != *data) {
printf("CRC error\n");
send_nack(priv);
} else {
printf("Cmd %d\n", cmd);
send_ack(priv);
/* Push the response onto the stack */
if (rsp)
*data = (uintptr_t)rsp;
else
*data = 0;
command_callbacks[cmd](stack, priv);
}
}
get_mem = ('m' @{cmd = GET_MEM;}
xdigit+ $hex_digit %push
','
xdigit+ $hex_digit %push);
put_mem = ('M' any* @{cmd = PUT_MEM;}
xdigit+ $hex_digit %push
','
xdigit+ $hex_digit %push
':'
xdigit+ $hex_digit %push);
get_gprs = ('g' @{cmd = GET_GPRS;});
get_spr = ('p' @{cmd = GET_SPR;}
xdigit+ $hex_digit %push);
stop_reason = ('?' @{cmd = STOP_REASON;});
set_thread = ('H' any* @{cmd = SET_THREAD;});
disconnect = ('D' @{cmd = DISCONNECT;}
xdigit+ $hex_digit %push);
# TODO: We don't actually listen to what's supported
q_attached = ('qAttached:' xdigit* @{rsp = "1";});
q_C = ('qC' @{rsp = "QC1";});
q_supported = ('qSupported:' any* @{rsp = "multiprocess+;vContSupported+";});
qf_threadinfo = ('qfThreadInfo' @{rsp = "m1l";});
# vCont packet parsing
v_contq = ('vCont?' @{rsp = "vCont;c;C;s;S";});
v_contc = ('vCont;c' any* @{cmd = V_CONTC;});
v_conts = ('vCont;s' any* @{cmd = V_CONTS;});
interrupt = (3 @{command_callbacks[INTERRUPT](stack, priv);});
commands = (get_mem | get_gprs | get_spr | stop_reason | set_thread |
q_attached | q_C | q_supported | qf_threadinfo | q_C |
v_contq | v_contc | v_conts | put_mem | disconnect );
cmd = ((commands & ^'#'*) | ^'#'*) $crc
('#' xdigit{2} $hex_digit @end);
# We ignore ACK/NACK for the moment
ack = ('+');
nack = ('-');
main := (( ^('$' | interrupt)*('$' | interrupt) @reset) (cmd | ack | nack))*;
}%%
static enum gdb_command cmd = NONE;
static uint64_t stack[10], *data = stack;
static char *rsp;
static uint8_t crc;
static int cs;
command_cb *command_callbacks;
%%write data;
void parser_init(command_cb *callbacks)
{
%%write init;
command_callbacks = callbacks;
}
int parse_buffer(char *buf, size_t len, void *priv)
{
char *p = buf;
char *pe = p + len + 1;
%%write exec;
return 0;
}
#if 0
int main(int argc, char **argv)
{
parser_init(NULL);
if (argc > 1)
parse_buffer(argv[1], strlen(argv[1]), NULL);
return 0;
}
#endif
|
