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authorDavid Brownell <dbrownell@users.sourceforge.net>2009-12-19 13:09:19 -0800
committerDavid Brownell <dbrownell@users.sourceforge.net>2009-12-19 13:09:19 -0800
commitabe8b43755fdbc4fe92b966c48b367159deff226 (patch)
tree45ab3a2c03476db594f54c966d043fcb07b5fc28
parent64934d9204dc854d40893634a66e29ece09ad578 (diff)
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ETM: add "etm trigger_debug" command
In conjunction with manual register setup, this lets the ETM trigger cause entry to debug state. It should make it easier to test and bugfix the ETM code, by enabling non-trace usage and isolating bugs specific to thef ETM support. (One current issue being that trace data collection using the ETB doesn't yet behave.) For example, many ARM9 cores with an ETM should be able to implement four more (simple) breakpoints and two more (simple) watchpoints than the EmbeddedICE supports. Or, they should be able to support complex breakpoints, incorporating ETM sequencer, counters, and/or subroutine entry/exit criteria int criteria used to trigger debug entry. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
-rw-r--r--NEWS1
-rw-r--r--doc/openocd.texi11
-rw-r--r--src/target/etm.c66
3 files changed, 74 insertions, 4 deletions
diff --git a/NEWS b/NEWS
index efcf8f61..e1229122 100644
--- a/NEWS
+++ b/NEWS
@@ -34,6 +34,7 @@ Target Layer:
- Exposed DWT registers like cycle counter
ETM, ETB
- "trigger_percent" command moved ETM --> ETB
+ - "etm trigger_debug" command added
Flash Layer:
'flash bank' and 'nand device' take <bank_name> as first argument.
diff --git a/doc/openocd.texi b/doc/openocd.texi
index bb3e51ac..d9cb4ea6 100644
--- a/doc/openocd.texi
+++ b/doc/openocd.texi
@@ -5512,6 +5512,17 @@ trace stream without an image of the code.
@end itemize
@end deffn
+@deffn Command {etm trigger_debug} (@option{enable}|@option{disable})
+Displays whether ETM triggering debug entry (like a breakpoint) is
+enabled or disabled, after optionally modifying that configuration.
+The default behaviour is @option{disable}.
+Any change takes effect after the next @command{etm start}.
+
+By using script commands to configure ETM registers, you can make the
+processor enter debug state automatically when certain conditions,
+more complex than supported by the breakpoint hardware, happen.
+@end deffn
+
@subsection ETM Trace Operation
After setting up the ETM, you can use it to collect data.
diff --git a/src/target/etm.c b/src/target/etm.c
index a506d1c4..d22bc407 100644
--- a/src/target/etm.c
+++ b/src/target/etm.c
@@ -446,12 +446,15 @@ int etm_setup(struct target *target)
etm_ctrl_value = (etm_ctrl_value
& ~ETM_PORT_WIDTH_MASK
& ~ETM_PORT_MODE_MASK
+ & ~ETM_CTRL_DBGRQ
& ~ETM_PORT_CLOCK_MASK)
| etm_ctx->control;
buf_set_u32(etm_ctrl_reg->value, 0, 32, etm_ctrl_value);
etm_store_reg(etm_ctrl_reg);
+ etm_ctx->control = etm_ctrl_value;
+
if ((retval = jtag_execute_queue()) != ERROR_OK)
return retval;
@@ -1338,8 +1341,6 @@ COMMAND_HANDLER(handle_etm_tracemode_command)
if (!etm_ctrl_reg)
return ERROR_FAIL;
- etm_get_reg(etm_ctrl_reg);
-
etm->control &= ~TRACEMODE_MASK;
etm->control |= tracemode & TRACEMODE_MASK;
@@ -2016,6 +2017,56 @@ COMMAND_HANDLER(handle_etm_stop_command)
return ERROR_OK;
}
+COMMAND_HANDLER(handle_etm_trigger_debug_command)
+{
+ struct target *target;
+ struct arm *arm;
+ struct etm_context *etm;
+
+ target = get_current_target(CMD_CTX);
+ arm = target_to_arm(target);
+ if (!is_arm(arm))
+ {
+ command_print(CMD_CTX, "ETM: %s isn't an ARM",
+ target_name(target));
+ return ERROR_FAIL;
+ }
+
+ etm = arm->etm;
+ if (!etm)
+ {
+ command_print(CMD_CTX, "ETM: no ETM configured for %s",
+ target_name(target));
+ return ERROR_FAIL;
+ }
+
+ if (CMD_ARGC == 1) {
+ struct reg *etm_ctrl_reg;
+ bool dbgrq;
+
+ etm_ctrl_reg = etm_reg_lookup(etm, ETM_CTRL);
+ if (!etm_ctrl_reg)
+ return ERROR_FAIL;
+
+ COMMAND_PARSE_ENABLE(CMD_ARGV[0], dbgrq);
+ if (dbgrq)
+ etm->control |= ETM_CTRL_DBGRQ;
+ else
+ etm->control &= ~ETM_CTRL_DBGRQ;
+
+ /* etm->control will be written to hardware
+ * the next time an "etm start" is issued.
+ */
+ buf_set_u32(etm_ctrl_reg->value, 0, 32, etm->control);
+ }
+
+ command_print(CMD_CTX, "ETM: %s debug halt",
+ (etm->control & ETM_CTRL_DBGRQ)
+ ? "triggers"
+ : "does not trigger");
+ return ERROR_OK;
+}
+
COMMAND_HANDLER(handle_etm_analyze_command)
{
struct target *target;
@@ -2112,10 +2163,17 @@ static const struct command_registration etm_exec_command_handlers[] = {
.help = "stop ETM trace collection",
},
{
+ .name = "trigger_debug",
+ .handler = handle_etm_trigger_debug_command,
+ .mode = COMMAND_EXEC,
+ .help = "enable/disable debug entry on trigger",
+ .usage = "(enable | disable)",
+ },
+ {
.name = "analyze",
- .handler = &handle_etm_analyze_command,
+ .handler = handle_etm_analyze_command,
.mode = COMMAND_EXEC,
- .help = "anaylze collected ETM trace",
+ .help = "analyze collected ETM trace",
},
{
.name = "image",