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breakpoints: use 64-bit type for watchpoint mask and value 

This patch changes data types of watchpoint value and mask to allow for
64-bit values match that some architectures (like RISCV) allow.

In addition this patch fixes the behavior of watchpoint command to
zero-out mask if only data value is provided.

Change-Id: I3c7ec1630f03ea9534ec34c0ebe99e08ea56e7f0
Signed-off-by: Parshintsev Anatoly <anatoly.parshintsev@syntacore.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/7840
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-by: Marek Vrbka <marek.vrbka@codasip.com>
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
This commit is contained in:
Parshintsev Anatoly 2023-07-28 20:41:32 +03:00 committed by Tomas Vanek
parent 2ca6d25eb5
commit 2cd8ebf44d
10 changed files with 36 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/server/gdb_server.c
View File

@ -1779,7 +1779,7 @@ static int gdb_breakpoint_watchpoint_packet(struct connection *connection,
case 4:
{
if (packet[0] == 'Z') {
retval = watchpoint_add(target, address, size, wp_type, 0, 0xffffffffu);
retval = watchpoint_add(target, address, size, wp_type, 0, WATCHPOINT_IGNORE_DATA_VALUE_MASK);
if (retval == ERROR_NOT_IMPLEMENTED) {
/* Send empty reply to report that watchpoints of this type are not supported */
gdb_put_packet(connection, "", 0);

9
src/target/arm7_9_common.c
View File

@ -451,6 +451,7 @@ static int arm7_9_set_watchpoint(struct target *target, struct watchpoint *watch
struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
int rw_mask = 1;
uint32_t mask;
const uint32_t wp_data_mask = watchpoint->mask;
mask = watchpoint->length - 1;
@ -469,8 +470,8 @@ static int arm7_9_set_watchpoint(struct target *target, struct watchpoint *watch
watchpoint->address);
embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_MASK], mask);
embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W0_DATA_MASK],
watchpoint->mask);
if (watchpoint->mask != 0xffffffffu)
wp_data_mask);
if (wp_data_mask != (uint32_t)WATCHPOINT_IGNORE_DATA_VALUE_MASK)
embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W0_DATA_VALUE],
watchpoint->value);
embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_MASK],
@ -488,8 +489,8 @@ static int arm7_9_set_watchpoint(struct target *target, struct watchpoint *watch
watchpoint->address);
embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W1_ADDR_MASK], mask);
embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W1_DATA_MASK],
watchpoint->mask);
if (watchpoint->mask != 0xffffffffu)
wp_data_mask);
if (wp_data_mask != (uint32_t)WATCHPOINT_IGNORE_DATA_VALUE_MASK)
embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W1_DATA_VALUE],
watchpoint->value);
embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_W1_CONTROL_MASK],

2
src/target/arm_dpm.c
View File

@ -918,7 +918,7 @@ static int dpm_watchpoint_setup(struct arm_dpm *dpm, unsigned index_t,
uint32_t control;
/* this hardware doesn't support data value matching or masking */
if (wp->value || wp->mask != ~(uint32_t)0) {
if (wp->mask != WATCHPOINT_IGNORE_DATA_VALUE_MASK) {
LOG_DEBUG("watchpoint values and masking not supported");
return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
}

2
src/target/armv8_dpm.c
View File

@ -1210,7 +1210,7 @@ static int dpmv8_watchpoint_setup(struct arm_dpm *dpm, unsigned index_t,
uint32_t control;
/* this hardware doesn't support data value matching or masking */
if (wp->value || wp->mask != ~(uint32_t)0) {
if (wp->mask != WATCHPOINT_IGNORE_DATA_VALUE_MASK) {
LOG_DEBUG("watchpoint values and masking not supported");
return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
}

4
src/target/breakpoints.c
View File

@ -393,7 +393,7 @@ struct breakpoint *breakpoint_find(struct target *target, target_addr_t address)
}
static int watchpoint_add_internal(struct target *target, target_addr_t address,
uint32_t length, enum watchpoint_rw rw, uint32_t value, uint32_t mask)
uint32_t length, enum watchpoint_rw rw, uint64_t value, uint64_t mask)
{
struct watchpoint *watchpoint = target->watchpoints;
struct watchpoint **watchpoint_p = &target->watchpoints;
@ -460,7 +460,7 @@ bye:
}
int watchpoint_add(struct target *target, target_addr_t address,
uint32_t length, enum watchpoint_rw rw, uint32_t value, uint32_t mask)
uint32_t length, enum watchpoint_rw rw, uint64_t value, uint64_t mask)
{
if (target->smp) {
struct target_list *head;

8
src/target/breakpoints.h
View File

@ -36,11 +36,13 @@ struct breakpoint {
int linked_brp;
};
#define WATCHPOINT_IGNORE_DATA_VALUE_MASK (~(uint64_t)0)
struct watchpoint {
target_addr_t address;
uint32_t length;
uint32_t mask;
uint32_t value;
uint64_t mask;
uint64_t value;
enum watchpoint_rw rw;
bool is_set;
unsigned int number;
@ -69,7 +71,7 @@ static inline void breakpoint_hw_set(struct breakpoint *breakpoint, unsigned int
void watchpoint_clear_target(struct target *target);
int watchpoint_add(struct target *target,
target_addr_t address, uint32_t length,
enum watchpoint_rw rw, uint32_t value, uint32_t mask);
enum watchpoint_rw rw, uint64_t value, uint64_t mask);
void watchpoint_remove(struct target *target, target_addr_t address);
/* report type and address of just hit watchpoint */

22
src/target/cortex_m.c
View File

@ -2046,8 +2046,14 @@ int cortex_m_add_watchpoint(struct target *target, struct watchpoint *watchpoint
return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
}
/* hardware doesn't support data value masking */
if (watchpoint->mask != ~(uint32_t)0) {
/* REVISIT This DWT may well be able to watch for specific data
* values. Requires comparator #1 to set DATAVMATCH and match
* the data, and another comparator (DATAVADDR0) matching addr.
*
* NOTE: hardware doesn't support data value masking, so we'll need
* to check that mask is zero
*/
if (watchpoint->mask != WATCHPOINT_IGNORE_DATA_VALUE_MASK) {
LOG_TARGET_DEBUG(target, "watchpoint value masks not supported");
return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
}
@ -2068,18 +2074,6 @@ int cortex_m_add_watchpoint(struct target *target, struct watchpoint *watchpoint
return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
}
/* Caller doesn't seem to be able to describe watching for data
* values of zero; that flags "no value".
*
* REVISIT This DWT may well be able to watch for specific data
* values. Requires comparator #1 to set DATAVMATCH and match
* the data, and another comparator (DATAVADDR0) matching addr.
*/
if (watchpoint->value) {
LOG_TARGET_DEBUG(target, "data value watchpoint not YET supported");
return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
}
cortex_m->dwt_comp_available--;
LOG_TARGET_DEBUG(target, "dwt_comp_available: %d", cortex_m->dwt_comp_available);

17
src/target/target.c
View File

@ -4061,8 +4061,8 @@ COMMAND_HANDLER(handle_wp_command)
while (watchpoint) {
command_print(CMD, "address: " TARGET_ADDR_FMT
", len: 0x%8.8" PRIx32
", r/w/a: %i, value: 0x%8.8" PRIx32
", mask: 0x%8.8" PRIx32,
", r/w/a: %i, value: 0x%8.8" PRIx64
", mask: 0x%8.8" PRIx64,
watchpoint->address,
watchpoint->length,
(int)watchpoint->rw,
@ -4076,15 +4076,20 @@ COMMAND_HANDLER(handle_wp_command)
enum watchpoint_rw type = WPT_ACCESS;
target_addr_t addr = 0;
uint32_t length = 0;
uint32_t data_value = 0x0;
uint32_t data_mask = 0xffffffff;
uint64_t data_value = 0x0;
uint64_t data_mask = WATCHPOINT_IGNORE_DATA_VALUE_MASK;
bool mask_specified = false;
switch (CMD_ARGC) {
case 5:
COMMAND_PARSE_NUMBER(u32, CMD_ARGV[4], data_mask);
COMMAND_PARSE_NUMBER(u64, CMD_ARGV[4], data_mask);
mask_specified = true;
/* fall through */
case 4:
COMMAND_PARSE_NUMBER(u32, CMD_ARGV[3], data_value);
COMMAND_PARSE_NUMBER(u64, CMD_ARGV[3], data_value);
// if user specified only data value without mask - the mask should be 0
if (!mask_specified)
data_mask = 0;
/* fall through */
case 3:
switch (CMD_ARGV[2][0]) {

2
src/target/xscale.c
View File

@ -2296,7 +2296,7 @@ static int xscale_add_watchpoint(struct target *target,
return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
}
if (watchpoint->value)
if (watchpoint->mask != WATCHPOINT_IGNORE_DATA_VALUE_MASK)
LOG_WARNING("xscale does not support value, mask arguments; ignoring");
/* check that length is a power of two */

2
src/target/xtensa/xtensa.c
View File

@ -2570,7 +2570,7 @@ int xtensa_watchpoint_add(struct target *target, struct watchpoint *watchpoint)
return ERROR_TARGET_NOT_HALTED;
}
if (watchpoint->mask != ~(uint32_t)0) {
if (watchpoint->mask != WATCHPOINT_IGNORE_DATA_VALUE_MASK) {
LOG_TARGET_ERROR(target, "watchpoint value masks not supported");
return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
}