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target: added events TARGET_EVENT_STEP_START and _END 

Events TARGET_EVENT_STEP_START and TARGET_EVENT_STEP_END
have been added - analogous to already existing events
TARGET_EVENT_RESUME_*.

This is an example of a concrete use case where having
these events is important:

In RISC-V processors without Debug Program Buffer, OpenOCD
cannot execute fence/fence.i when resuming or single-
stepping. With these events implemented, the user can
instead provide custom operations to achieve that same
effect prior to resuming the processor.

Change-Id: I786348ff08940759d99b0f24e9e0ed5a44581094
Signed-off-by: Jan Matyas <matyas@codasip.com>
Reviewed-on: http://openocd.zylin.com/5551
Tested-by: jenkins
Reviewed-by: Tim Newsome <tim@sifive.com>
This commit is contained in:
Jan Matyas 2020-04-01 11:58:20 +02:00 committed by Tomas Vanek
parent 0a804222da
commit 25efc15069
3 changed files with 20 additions and 2 deletions
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4
doc/openocd.texi
View File

@ -4924,6 +4924,10 @@ when reset disables PLLs needed to use a fast clock.
@* After all targets have resumed
@item @b{resumed}
@* Target has resumed
@item @b{step-start}
@* Before a target is single-stepped
@item @b{step-end}
@* After single-step has completed
@item @b{trace-config}
@* After target hardware trace configuration was changed
@end itemize

16
src/target/target.c
View File

@ -205,6 +205,8 @@ static const Jim_Nvp nvp_target_event[] = {
{ .value = TARGET_EVENT_RESUMED, .name = "resumed" },
{ .value = TARGET_EVENT_RESUME_START, .name = "resume-start" },
{ .value = TARGET_EVENT_RESUME_END, .name = "resume-end" },
{ .value = TARGET_EVENT_STEP_START, .name = "step-start" },
{ .value = TARGET_EVENT_STEP_END, .name = "step-end" },
{ .name = "gdb-start", .value = TARGET_EVENT_GDB_START },
{ .name = "gdb-end", .value = TARGET_EVENT_GDB_END },
@ -1256,7 +1258,17 @@ bool target_supports_gdb_connection(struct target *target)
int target_step(struct target *target,
int current, target_addr_t address, int handle_breakpoints)
{
return target->type->step(target, current, address, handle_breakpoints);
int retval;
target_call_event_callbacks(target, TARGET_EVENT_STEP_START);
retval = target->type->step(target, current, address, handle_breakpoints);
if (retval != ERROR_OK)
return retval;
target_call_event_callbacks(target, TARGET_EVENT_STEP_END);
return retval;
}
int target_get_gdb_fileio_info(struct target *target, struct gdb_fileio_info *fileio_info)
@ -3145,7 +3157,7 @@ COMMAND_HANDLER(handle_step_command)
struct target *target = get_current_target(CMD_CTX);
return target->type->step(target, current_pc, addr, 1);
return target_step(target, current_pc, addr, 1);
}
void target_handle_md_output(struct command_invocation *cmd,

2
src/target/target.h
View File

@ -258,6 +258,8 @@ enum target_event {
TARGET_EVENT_RESUMED, /* target resumed to normal execution */
TARGET_EVENT_RESUME_START,
TARGET_EVENT_RESUME_END,
TARGET_EVENT_STEP_START,
TARGET_EVENT_STEP_END,
TARGET_EVENT_GDB_START, /* debugger started execution (step/run) */
TARGET_EVENT_GDB_END, /* debugger stopped execution (step/run) */