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

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
View File

@ -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]))

2
src/target/register.h
View File

@ -134,6 +134,8 @@ struct reg {
bool valid;
/* When false, the register doesn't actually exist in the target. */
bool exist;
/* Hide the register from gdb and omit it in 'reg' cmd output */
bool hidden;
/* Size of the register in bits. */
uint32_t size;
/* Used for generating XML description of registers. Can be set to NULL for

2
src/target/target.c
View File

@ -3037,7 +3037,7 @@ COMMAND_HANDLER(handle_reg_command)
for (i = 0, reg = cache->reg_list;
i < cache->num_regs;
i++, reg++, count++) {
if (reg->exist == false)
if (reg->exist == false || reg->hidden)
continue;
/* only print cached values if they are valid */
if (reg->valid) {

2
src/target/xscale.c
View File

@ -2882,7 +2882,7 @@ static void xscale_build_reg_cache(struct target *target)
/* fill in values for the xscale reg cache */
(*cache_p)->name = "XScale registers";
(*cache_p)->next = NULL;
(*cache_p)->reg_list = malloc(num_regs * sizeof(struct reg));
(*cache_p)->reg_list = calloc(num_regs, sizeof(struct reg));
(*cache_p)->num_regs = num_regs;
for (i = 0; i < num_regs; i++) {