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hla_target: allow non-intrusive profiling on cortex-m

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Leverages the existing work that added profiling via DWT_PCSR.

hla_target doesn't have direct access to the mem_ap for doing a bulk
repeated read, but simply reading the DWT_PCSR register repeatedly is
still ~2 order of magnitude faster than halt/resume.

Change-Id: Ibe451aa95143694398370fdad6939cfb6191d56f
Signed-off-by: Karl Palsson <karlp@tweak.net.au>
Reviewed-on: http://openocd.zylin.com/4220
Tested-by: jenkins
Reviewed-by: Paul Fertser <fercerpav@gmail.com>
This commit is contained in:
Karl Palsson
2017-09-08 10:49:30 +00:00
committed by Paul Fertser
parent 64b0d5aac0
commit 4e0371bf71
3 changed files with 14 additions and 6 deletions
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17
src/target/cortex_m.c
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@@ -1707,7 +1707,7 @@ void cortex_m_deinit_target(struct target *target)
free(cortex_m);
}
static int cortex_m_profiling(struct target *target, uint32_t *samples,
int cortex_m_profiling(struct target *target, uint32_t *samples,
uint32_t max_num_samples, uint32_t *num_samples, uint32_t seconds)
{
struct timeval timeout, now;
@@ -1749,13 +1749,18 @@ static int cortex_m_profiling(struct target *target, uint32_t *samples,
for (;;) {
if (use_pcsr) {
uint32_t read_count = max_num_samples - sample_count;
if (read_count > 1024)
read_count = 1024;
retval = mem_ap_read_buf_noincr(armv7m->debug_ap,
if (armv7m && armv7m->debug_ap) {
uint32_t read_count = max_num_samples - sample_count;
if (read_count > 1024)
read_count = 1024;
retval = mem_ap_read_buf_noincr(armv7m->debug_ap,
(void *)&samples[sample_count],
4, read_count, DWT_PCSR);
sample_count += read_count;
sample_count += read_count;
} else {
target_read_u32(target, DWT_PCSR, &samples[sample_count++]);
}
} else {
target_poll(target);
if (target->state == TARGET_HALTED) {