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target, register: allow a register hidden from gdb and 'reg' cmd

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Introduce a 'hidden' flag in struct reg to support a register cache
containing different views of same data: e.g. Cortex-M has
primask, basepri, faultmask and control registers accessed
as one word. With the hidden flag we can add an reg_list item
corresponding to hw access without exposing the register to user level.

All the struct reg are allocated with calloc() but one in xscale.c
allocated by malloc(). Change this one to use calloc() as well
to guarantee initial value hidden=false

Change-Id: I8da9f5a5a60777ae7ef943a841307487bd80fc6f
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-on: http://openocd.zylin.com/5325
Tested-by: jenkins
Reviewed-by: Tarek BOCHKATI <tarek.bouchkati@gmail.com>
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
This commit is contained in:
Tomas Vanek
2019-10-20 09:40:34 +02:00
committed by Antonio Borneo
parent 109dc1975f
commit f8453ae52c
4 changed files with 8 additions and 6 deletions
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8
src/server/gdb_server.c
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@@ -1189,7 +1189,7 @@ static int gdb_get_registers_packet(struct connection *connection,
return gdb_error(connection, retval);
for (i = 0; i < reg_list_size; i++) {
if (reg_list[i] == NULL || reg_list[i]->exist == false)
if (reg_list[i] == NULL || reg_list[i]->exist == false || reg_list[i]->hidden)
continue;
reg_packet_size += DIV_ROUND_UP(reg_list[i]->size, 8) * 2;
}
@@ -1203,7 +1203,7 @@ static int gdb_get_registers_packet(struct connection *connection,
reg_packet_p = reg_packet;
for (i = 0; i < reg_list_size; i++) {
if (reg_list[i] == NULL || reg_list[i]->exist == false)
if (reg_list[i] == NULL || reg_list[i]->exist == false || reg_list[i]->hidden)
continue;
if (!reg_list[i]->valid) {
retval = reg_list[i]->type->get(reg_list[i]);
@@ -2176,7 +2176,7 @@ static int get_reg_features_list(struct target *target, char const **feature_lis
*feature_list = calloc(1, sizeof(char *));
for (int i = 0; i < reg_list_size; i++) {
if (reg_list[i]->exist == false)
if (reg_list[i]->exist == false || reg_list[i]->hidden)
continue;
if (reg_list[i]->feature != NULL
@@ -2270,7 +2270,7 @@ static int gdb_generate_target_description(struct target *target, char **tdesc_o
int i;
for (i = 0; i < reg_list_size; i++) {
if (reg_list[i]->exist == false)
if (reg_list[i]->exist == false || reg_list[i]->hidden)
continue;
if (strcmp(reg_list[i]->feature->name, features[current_feature]))