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| author | Markus Metzger <markus.t.metzger@intel.com> | 2014-11-17 11:18:05 +0100 |
|---|---|---|
| committer | Markus Metzger <markus.t.metzger@intel.com> | 2015-07-02 12:52:19 +0200 |
| commit | 010a18a1b12ec6d5219b7e602aa6abe12344dd1a (patch) | |
| tree | d9a6517e7f3e0b3e9a4cdc51fd6ed02b41ceba15 | |
| parent | b20a652466ea6e62e7d056188b79a0677a29f46e (diff) | |
| download | gdb-010a18a1b12ec6d5219b7e602aa6abe12344dd1a.zip gdb-010a18a1b12ec6d5219b7e602aa6abe12344dd1a.tar.gz gdb-010a18a1b12ec6d5219b7e602aa6abe12344dd1a.tar.bz2 | |
btrace, linux: use data_size and data_offset
In struct perf_event_mmap_page there are new fields data_size and data_offset
that give the location of the perf_event data buffer relative to the mmap
page. Use them if they are present.
gdb/
* nat/linux-btrace.c (linux_enable_bts): Check for
PERF_ATTR_SIZE_VER5.
Check for data_offset and data_size fields. Use them.
| -rw-r--r-- | gdb/ChangeLog | 6 | ||||
| -rw-r--r-- | gdb/nat/linux-btrace.c | 21 |
2 files changed, 22 insertions, 5 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 4c96e8a..a4cce4d 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,5 +1,11 @@ 2015-07-02 Markus Metzger <markus.t.metzger@intel.com> + * nat/linux-btrace.c (linux_enable_bts): Check for + PERF_ATTR_SIZE_VER5. + Check for data_offset and data_size fields. Use them. + +2015-07-02 Markus Metzger <markus.t.metzger@intel.com> + * NEWS: Announce new commands "record btrace pt" and "record pt". Announce new options "set|show record btrace pt buffer-size". * btrace.c: Include "rsp-low.h". diff --git a/gdb/nat/linux-btrace.c b/gdb/nat/linux-btrace.c index ddd79a3..3b630f5 100644 --- a/gdb/nat/linux-btrace.c +++ b/gdb/nat/linux-btrace.c @@ -642,7 +642,7 @@ linux_enable_bts (ptid_t ptid, const struct btrace_config_bts *conf) struct perf_event_mmap_page *header; struct btrace_target_info *tinfo; struct btrace_tinfo_bts *bts; - unsigned long long size, pages; + unsigned long long size, pages, data_offset, data_size; int pid, pg; tinfo = xzalloc (sizeof (*tinfo)); @@ -704,16 +704,27 @@ linux_enable_bts (ptid_t ptid, const struct btrace_config_bts *conf) break; } - if (header == MAP_FAILED) + if (pages == 0) goto err_file; + data_offset = PAGE_SIZE; + data_size = size; + +#if defined (PERF_ATTR_SIZE_VER5) + if (offsetof (struct perf_event_mmap_page, data_size) <= header->size) + { + data_offset = header->data_offset; + data_size = header->data_size; + } +#endif /* defined (PERF_ATTR_SIZE_VER5) */ + bts->header = header; - bts->bts.mem = ((const uint8_t *) header) + PAGE_SIZE; - bts->bts.size = size; + bts->bts.mem = ((const uint8_t *) header) + data_offset; + bts->bts.size = data_size; bts->bts.data_head = &header->data_head; bts->bts.last_head = 0; - tinfo->conf.bts.size = size; + tinfo->conf.bts.size = data_size; return tinfo; err_file: |