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| author | Markus Metzger <markus.t.metzger@intel.com> | 2013-06-03 15:39:35 +0200 |
|---|---|---|
| committer | Markus Metzger <markus.t.metzger@intel.com> | 2014-01-16 13:11:42 +0100 |
| commit | 969c39fbcd6a5675c1f4b97cd23d680e4b5b6487 (patch) | |
| tree | 54d7a2c546ecf86fbe37536db86d0916734203d8 /gdb/gdbserver/server.c | |
| parent | 0b722aec57e2e54083c1d56657762945ad4604fc (diff) | |
| download | gdb-969c39fbcd6a5675c1f4b97cd23d680e4b5b6487.zip gdb-969c39fbcd6a5675c1f4b97cd23d680e4b5b6487.tar.gz gdb-969c39fbcd6a5675c1f4b97cd23d680e4b5b6487.tar.bz2 | |
btrace, gdbserver: read branch trace incrementally
Read branch trace data incrementally and extend the current trace rather than
discarding it and reading the entire trace buffer each time.
If the branch trace buffer overflowed, we can't extend the current trace so we
discard it and start anew by reading the entire branch trace buffer.
2014-01-16 Markus Metzger <markus.t.metzger@intel.com>
* common/linux-btrace.c (perf_event_read_bts, linux_read_btrace):
Support delta reads.
(linux_disable_btrace): Change return type.
* common/linux-btrace.h (linux_read_btrace): Change parameters
and return type to allow error reporting. Update users.
(linux_disable_btrace): Change return type. Update users.
* common/btrace-common.h (btrace_read_type) <BTRACE_READ_DELTA>:
New.
(btrace_error): New.
(btrace_block) <begin>: Comment on BEGIN == 0.
* btrace.c (btrace_compute_ftrace): Start from the end of
the current trace.
(btrace_stitch_trace, btrace_clear_history): New.
(btrace_fetch): Read delta trace, return if replaying.
(btrace_clear): Move clear history code to btrace_clear_history.
(parse_xml_btrace): Throw an error if parsing failed.
* target.h (struct target_ops) <to_read_btrace>: Change parameters
and return type to allow error reporting.
(target_read_btrace): Change parameters and return type to allow
error reporting.
* target.c (target_read_btrace): Update.
* remote.c (remote_read_btrace): Support delta reads. Pass
errors on.
* NEWS: Announce it.
gdbserver/
* target.h (target_ops) <read_btrace>: Change parameters and
return type to allow error reporting.
* server.c (handle_qxfer_btrace): Support delta reads. Pass
trace reading errors on.
* linux-low.c (linux_low_read_btrace): Pass trace reading
errors on.
(linux_low_disable_btrace): New.
Diffstat (limited to 'gdb/gdbserver/server.c')
| -rw-r--r-- | gdb/gdbserver/server.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/gdb/gdbserver/server.c b/gdb/gdbserver/server.c index 9ae28f8..28ea048 100644 --- a/gdb/gdbserver/server.c +++ b/gdb/gdbserver/server.c @@ -1348,7 +1348,7 @@ handle_qxfer_btrace (const char *annex, { static struct buffer cache; struct thread_info *thread; - int type; + int type, result; if (the_target->read_btrace == NULL || writebuf != NULL) return -2; @@ -1380,6 +1380,8 @@ handle_qxfer_btrace (const char *annex, type = BTRACE_READ_ALL; else if (strcmp (annex, "new") == 0) type = BTRACE_READ_NEW; + else if (strcmp (annex, "delta") == 0) + type = BTRACE_READ_DELTA; else { strcpy (own_buf, "E.Bad annex."); @@ -1390,7 +1392,12 @@ handle_qxfer_btrace (const char *annex, { buffer_free (&cache); - target_read_btrace (thread->btrace, &cache, type); + result = target_read_btrace (thread->btrace, &cache, type); + if (result != 0) + { + memcpy (own_buf, cache.buffer, cache.used_size); + return -3; + } } else if (offset > cache.used_size) { |