In target_type.h it's documented that the target must be
halted for add_breakpoint() ... and with slight ambiguity,
also for its add_watchpoint() sibling. So rather than
verifying that constraint in the CPU drivers, do it in the
target_add_{break,watch}point() routines.
Add minor paranoia on the remove_*point() paths too: save
the return value, and print it out in in the LOG_DEBUG message
in case it's nonzero.
Note that with some current cores, like all ARMv7 ones I've
looked at, there's no technical issue preventing watchpoint or
breakpoint add/remove operations on active cores. This model
seems deeply wired into OpenOCD though.
ALSO: the ARM targets were fairly "good" about enforcing that
constraint themselves. The MIPS ones were relied on other code
to catch such stuff, but it's not clear such code existed ...
keep an eye out for new issues on MIPS.
---
This is obviously safe on ARMs, but I'm less certain about
the MIPS stuff ... I'll wait a bit before committing this,
in case some MIPSy person sees a downside.
src/target/arm7_9_common.c | 12 ------------
src/target/breakpoints.c | 10 ++++++----
src/target/cortex_m3.c | 7 -------
src/target/target.c | 8 ++++++++
src/target/target_type.h | 12 +++++++++---
src/target/xscale.c | 12 ------------
6 files changed, 23 insertions(+), 38 deletions(-)
--- a/src/target/arm7_9_common.c
+++ b/src/target/arm7_9_common.c
@@ -426,12 +426,6 @@ int arm7_9_add_breakpoint(struct target
{
struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
- if (target->state != TARGET_HALTED)
- {
- LOG_WARNING("target not halted");
- return ERROR_TARGET_NOT_HALTED;
- }
-
if (arm7_9->breakpoint_count == 0)
{
/* make sure we don't have any dangling breakpoints. This is
vital upon
@@ -631,12 +625,6 @@ int arm7_9_add_watchpoint(struct target
{
struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
- if (target->state != TARGET_HALTED)
- {
- LOG_WARNING("target not halted");
- return ERROR_TARGET_NOT_HALTED;
- }
-
if (arm7_9->wp_available < 1)
{
return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
--- a/src/target/breakpoints.c
+++ b/src/target/breakpoints.c
@@ -109,6 +109,7 @@ static void breakpoint_free(struct targe
{
struct breakpoint *breakpoint = target->breakpoints;
struct breakpoint **breakpoint_p = &target->breakpoints;
+ int retval;
while (breakpoint)
{
@@ -121,9 +122,9 @@ static void breakpoint_free(struct targe
if (breakpoint == NULL)
return;
- target_remove_breakpoint(target, breakpoint);
+ retval = target_remove_breakpoint(target, breakpoint);
- LOG_DEBUG("BPID: %d", breakpoint->unique_id );
+ LOG_DEBUG("free BPID: %d --> %d", breakpoint->unique_id, retval);
(*breakpoint_p) = breakpoint->next;
free(breakpoint->orig_instr);
free(breakpoint);
@@ -249,6 +250,7 @@ static void watchpoint_free(struct targe
{
struct watchpoint *watchpoint = target->watchpoints;
struct watchpoint **watchpoint_p = &target->watchpoints;
+ int retval;
while (watchpoint)
{
@@ -260,8 +262,8 @@ static void watchpoint_free(struct targe
if (watchpoint == NULL)
return;
- target_remove_watchpoint(target, watchpoint);
- LOG_DEBUG("WPID: %d", watchpoint->unique_id );
+ retval = target_remove_watchpoint(target, watchpoint);
+ LOG_DEBUG("free WPID: %d --> %d", watchpoint->unique_id, retval);
(*watchpoint_p) = watchpoint->next;
free(watchpoint);
}
--- a/src/target/cortex_m3.c
+++ b/src/target/cortex_m3.c
@@ -1141,13 +1141,6 @@ cortex_m3_add_watchpoint(struct target *
{
struct cortex_m3_common *cortex_m3 = target_to_cm3(target);
- /* REVISIT why check? DWT can be updated with core running ... */
- if (target->state != TARGET_HALTED)
- {
- LOG_WARNING("target not halted");
- return ERROR_TARGET_NOT_HALTED;
- }
-
if (cortex_m3->dwt_comp_available < 1)
{
LOG_DEBUG("no comparators?");
--- a/src/target/target.c
+++ b/src/target/target.c
@@ -605,6 +605,10 @@ int target_bulk_write_memory(struct targ
int target_add_breakpoint(struct target *target,
struct breakpoint *breakpoint)
{
+ if (target->state != TARGET_HALTED) {
+ LOG_WARNING("target %s is not halted", target->cmd_name);
+ return ERROR_TARGET_NOT_HALTED;
+ }
return target->type->add_breakpoint(target, breakpoint);
}
int target_remove_breakpoint(struct target *target,
@@ -616,6 +620,10 @@ int target_remove_breakpoint(struct targ
int target_add_watchpoint(struct target *target,
struct watchpoint *watchpoint)
{
+ if (target->state != TARGET_HALTED) {
+ LOG_WARNING("target %s is not halted", target->cmd_name);
+ return ERROR_TARGET_NOT_HALTED;
+ }
return target->type->add_watchpoint(target, watchpoint);
}
int target_remove_watchpoint(struct target *target,
--- a/src/target/target_type.h
+++ b/src/target/target_type.h
@@ -124,18 +124,24 @@ struct target_type
* Target must be halted while this is invoked as this
* will actually set up breakpoints on target.
*
- * The breakpoint hardware will be set up upon adding the first
breakpoint.
+ * The breakpoint hardware will be set up upon adding the
+ * first breakpoint.
*
* Upon GDB connection all breakpoints/watchpoints are cleared.
*/
int (*add_breakpoint)(struct target *target, struct breakpoint
*breakpoint);
- /* remove breakpoint. hw will only be updated if the target is
currently halted.
+ /* remove breakpoint. hw will only be updated if the target
+ * is currently halted.
* However, this method can be invoked on unresponsive targets.
*/
int (*remove_breakpoint)(struct target *target, struct breakpoint
*breakpoint);
+
+ /* add watchpoint ... see add_breakpoint() comment above. */
int (*add_watchpoint)(struct target *target, struct watchpoint
*watchpoint);
- /* remove watchpoint. hw will only be updated if the target is
currently halted.
+
+ /* remove watchpoint. hw will only be updated if the target
+ * is currently halted.
* However, this method can be invoked on unresponsive targets.
*/
int (*remove_watchpoint)(struct target *target, struct watchpoint
*watchpoint);
--- a/src/target/xscale.c
+++ b/src/target/xscale.c
@@ -2119,12 +2119,6 @@ static int xscale_add_breakpoint(struct
{
struct xscale_common *xscale = target_to_xscale(target);
- if (target->state != TARGET_HALTED)
- {
- LOG_WARNING("target not halted");
- return ERROR_TARGET_NOT_HALTED;
- }
-
if ((breakpoint->type == BKPT_HARD) && (xscale->ibcr_available < 1))
{
LOG_INFO("no breakpoint unit available for hardware
breakpoint");
@@ -2282,12 +2276,6 @@ static int xscale_add_watchpoint(struct
{
struct xscale_common *xscale = target_to_xscale(target);
- if (target->state != TARGET_HALTED)
- {
- LOG_WARNING("target not halted");
- return ERROR_TARGET_NOT_HALTED;
- }
-
if (xscale->dbr_available < 1)
{
return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
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