diff options
Diffstat (limited to 'gdb/nat')
| -rw-r--r-- | gdb/nat/linux-btrace.c | 21 |
1 files changed, 16 insertions, 5 deletions
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: |