snikeguo opened a new issue, #16409:
URL: https://github.com/apache/nuttx/issues/16409
### Is your feature request related to a problem? Please describe.
Some firmware runs in RAM, such as external SDRAM, where breakpoint
instructions can be used to implement an unlimited number of breakpoints.
### Describe the solution you'd like
pseudocode:
```
typedef uint16_t platform_bkpt_t;//armv7m bkpt is 16 bits
struct debug_point
{
int type;
platform_bkpt_t old_instruction;
uintptr_t address;
void *arg;
debug_callback_t callback;
bool is_active;
bool is_software;
}
list<debug_point> debug_points;
int up_debugpoint_add(int type, void *addr, size_t size,
debug_callback_t callback, void *arg,bool is_software)
{
struct debug_point dp;
dp.address = (uintptr_t)addr;
dp.callback = callback;
dp.arg = arg;
dp.is_active = true;
dp.is_software = is_software;
dp.type = type;
bool is_valid = false;
...
if(is_software)
{
is_valid=true;
memcpy(&dp.old_instruction, (void *)addr,
sizeof(platform_bkpt_t));
}
else
{
// Add hardware breakpoint
// ...
var
hardware_breakpoint_count=debug_points.select(x=>x.is_software==false).Count();//get
count of hardware breakpoints
if(hardware_breakpoint_count>=MAX_HARDWARE_BREAKPOINTS)
{
// Error: too many hardware breakpoints
is_valid=false;
}
}
if(is_valid)
{
debug_points.push_back(dp);
}
return 0;
}
int arm_dbgmonitor(int irq, void *context, void *arg)
{
var pc=regs[REG_PC];
var breakpoint=debug_points.find(x=>x.address==pc);
if(breakpoint!=null)
{
if(breakpoint.is_software)
{
// Handle software breakpoint, restore old
instruction
memcpy((void *)pc, &breakpoint.old_instruction,
sizeof(platform_bkpt_t));
breakpoint.callback(breakpoint.arg);
}
else
{
// Handle hardware breakpoint
// ...
}
arm_steppoint_match();...
arm_breakpoint_match()..
arm_watchpoint_match()...
}
}
```
### Describe alternatives you've considered
_No response_
### Verification
- [x] I have verified before submitting the report.
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