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server/gdb: fix return of gdb remote monitor command 

Current implementation for gdb remote monitor command uses the
command_run_line() to execute the command.
While command_run_line() has several advantages, it unfortunately
hides the error codes and outputs the result of the command
through LOG_USER(), which is not what gdb requires. See 'qRcmd' in
https://sourceware.org/gdb/onlinedocs/gdb/General-Query-Packets.html

Replace command_run_line() with Jim_EvalObj() and parse the output
to provide the proper result to gdb.

Can be tested by defining in OpenOCD:
	proc a {} {return hello}
	proc b {} {return -code 4}
	proc c {} {return -code 4 "This is an error!"}
then by executing in gdb console:
	monitor a
	monitor b
	monitor c
	monitor foo

Change-Id: I1b85554d59221560e97861a499e16764e70c1172
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reported-by: Torbjorn Svensson <torbjorn.svensson@st.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/6886
Tested-by: jenkins
This commit is contained in:
Antonio Borneo 2022-03-30 23:55:04 +02:00
parent d8c81d7254
commit 5ebb1bdea1
1 changed files with 42 additions and 1 deletions
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43
src/server/gdb_server.c
View File

@ -2761,11 +2761,52 @@ static int gdb_query_packet(struct connection *connection,
/* some commands need to know the GDB connection, make note of current
* GDB connection. */
current_gdb_connection = gdb_connection;
command_run_line(cmd_ctx, cmd);
struct target *saved_target_override = cmd_ctx->current_target_override;
cmd_ctx->current_target_override = target;
int retval = Jim_EvalObj(cmd_ctx->interp, Jim_NewStringObj(cmd_ctx->interp, cmd, -1));
cmd_ctx->current_target_override = saved_target_override;
current_gdb_connection = NULL;
target_call_timer_callbacks_now();
gdb_connection->output_flag = GDB_OUTPUT_NO;
free(cmd);
if (retval == JIM_RETURN)
retval = cmd_ctx->interp->returnCode;
int lenmsg;
const char *cretmsg = Jim_GetString(Jim_GetResult(cmd_ctx->interp), &lenmsg);
char *retmsg;
if (lenmsg && cretmsg[lenmsg - 1] != '\n') {
retmsg = alloc_printf("%s\n", cretmsg);
lenmsg++;
} else {
retmsg = strdup(cretmsg);
}
if (!retmsg)
return ERROR_GDB_BUFFER_TOO_SMALL;
if (retval == JIM_OK) {
if (lenmsg) {
char *hex_buffer = malloc(lenmsg * 2 + 1);
if (!hex_buffer) {
free(retmsg);
return ERROR_GDB_BUFFER_TOO_SMALL;
}
size_t pkt_len = hexify(hex_buffer, (const uint8_t *)retmsg, lenmsg,
lenmsg * 2 + 1);
gdb_put_packet(connection, hex_buffer, pkt_len);
free(hex_buffer);
} else {
gdb_put_packet(connection, "OK", 2);
}
} else {
if (lenmsg)
gdb_output_con(connection, retmsg);
gdb_send_error(connection, retval);
}
free(retmsg);
return ERROR_OK;
}
gdb_put_packet(connection, "OK", 2);
return ERROR_OK;