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cortex_m: implement hit_watchpoint function 

this change aims to provide a better gdb debugging experience,
by making gdb understand what's really happening.

before this change when hitting a watchpoint
 - openocd reports "T05" to gdb
 - gdb displays: Program received signal SIGTRAP, Trace/breakpoint trap.

after the change
 - openocd reports "T05watch:20000000;" to gdb
 - gdb displays:
   Hardware watchpoint 1: *0x20000000

   Old value = 16000000
   New value = 170000000
   ...

Change-Id: Iac3a85eadd86663617889001dd04513a4211ced9
Signed-off-by: Tarek BOCHKATI <tarek.bouchkati@gmail.com>
Reviewed-on: http://openocd.zylin.com/6181
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
This commit is contained in:
Tarek BOCHKATI 2021-04-22 20:47:23 +01:00 committed by Tomas Vanek
parent b60d06ae32
commit a115b589a7
1 changed files with 30 additions and 0 deletions
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30
src/target/cortex_m.c
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@ -1596,6 +1596,35 @@ int cortex_m_remove_watchpoint(struct target *target, struct watchpoint *watchpo
return ERROR_OK;
}
int cortex_m_hit_watchpoint(struct target *target, struct watchpoint **hit_watchpoint)
{
if (target->debug_reason != DBG_REASON_WATCHPOINT)
return ERROR_FAIL;
struct cortex_m_common *cortex_m = target_to_cm(target);
for (struct watchpoint *wp = target->watchpoints; wp; wp = wp->next) {
if (!wp->set)
continue;
unsigned int dwt_num = wp->set - 1;
struct cortex_m_dwt_comparator *comparator = cortex_m->dwt_comparator_list + dwt_num;
uint32_t dwt_function;
int retval = target_read_u32(target, comparator->dwt_comparator_address + 8, &dwt_function);
if (retval != ERROR_OK)
return ERROR_FAIL;
/* check the MATCHED bit */
if (dwt_function & BIT(24)) {
*hit_watchpoint = wp;
return ERROR_OK;
}
}
return ERROR_FAIL;
}
void cortex_m_enable_watchpoints(struct target *target)
{
struct watchpoint *watchpoint = target->watchpoints;
@ -2523,6 +2552,7 @@ struct target_type cortexm_target = {
.remove_breakpoint = cortex_m_remove_breakpoint,
.add_watchpoint = cortex_m_add_watchpoint,
.remove_watchpoint = cortex_m_remove_watchpoint,
.hit_watchpoint = cortex_m_hit_watchpoint,
.commands = cortex_m_command_handlers,
.target_create = cortex_m_target_create,