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gdb: implement breakpoint support

This commit is contained in:
Daniel Beer 2010-05-12 18:17:12 +12:00
parent c582a3513d
commit f4fcd0c909
1 changed files with 71 additions and 0 deletions
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71
gdb.c
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@ -47,6 +47,12 @@ struct gdb_data {
int outlen;
device_t device;
/* The underlying device driver supports only one breakpoint at
* a time. We keep track of whether or not it's in use and report
* an error to gdb if more than one is set.
*/
int have_breakpoint;
};
static void gdb_printf(struct gdb_data *data, const char *fmt, ...)
@ -433,12 +439,71 @@ static int run(struct gdb_data *data, char *buf)
return run_final_status(data);
}
static int set_breakpoint(struct gdb_data *data, int enable, char *buf)
{
char *parts[2];
int type;
int addr;
int i;
/* Break up the arguments */
for (i = 0; i < 2; i++)
parts[i] = strsep(&buf, ",");
/* Make sure there's a type argument */
if (!parts[0]) {
fprintf(stderr, "gdb: breakpoint requested with no type\n");
return gdb_send(data, "E00");
}
/* We only support breakpoints */
type = atoi(parts[0]);
if (type < 0 || type > 1) {
fprintf(stderr, "gdb: unsupported breakpoint type: %s\n",
parts[0]);
return gdb_send(data, "");
}
/* There needs to be an address specified */
if (!parts[1]) {
fprintf(stderr, "gdb: breakpoint address missing\n");
return gdb_send(data, "E00");
}
/* Parse the breakpoint address */
addr = strtoul(parts[1], NULL, 16);
/* Only one breakpoint at a time is allowed */
if (enable && data->have_breakpoint) {
fprintf(stderr, "gdb: only one breakpoint allowed "
"at a time\n");
return gdb_send(data, "E00");
}
/* Set the breakpoint */
if (data->device->breakpoint(data->device, enable, addr) < 0)
return gdb_send(data, "E00");
data->have_breakpoint = enable;
if (enable)
printf("Breakpoint set at 0x%04x\n", addr);
else
printf("Breakpoint cleared\n");
return gdb_send(data, "OK");
}
static int process_gdb_command(struct gdb_data *data, char *buf, int len)
{
switch (buf[0]) {
case '?': /* Return target halt reason */
return gdb_send(data, "T00");
case 'z':
case 'Z':
return set_breakpoint(data, buf[0] == 'Z', buf + 1);
case 'g': /* Read registers */
return read_registers(data);
@ -586,8 +651,14 @@ static int gdb_server(device_t device, int port)
data.outlen = 0;
data.device = device;
/* Put the hardware breakpoint setting into a known state. */
data.have_breakpoint = 0;
device->breakpoint(device, 0, 0);
gdb_reader_loop(&data);
device->breakpoint(device, 0, 0);
return data.error ? -1 : 0;
}