diff options
Diffstat (limited to 'tools/perf/util/machine.c')
| -rw-r--r-- | tools/perf/util/machine.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c index 37f8dc557ec0..e00daf0d2bde 100644 --- a/tools/perf/util/machine.c +++ b/tools/perf/util/machine.c @@ -32,6 +32,7 @@ int machine__init(struct machine *machine, const char *root_dir, pid_t pid) machine->symbol_filter = NULL; machine->id_hdr_size = 0; machine->comm_exec = false; + machine->kernel_start = 0; machine->root_dir = strdup(root_dir); if (machine->root_dir == NULL) @@ -1559,3 +1560,25 @@ int machine__set_current_tid(struct machine *machine, int cpu, pid_t pid, return 0; } + +int machine__get_kernel_start(struct machine *machine) +{ + struct map *map = machine__kernel_map(machine, MAP__FUNCTION); + int err = 0; + + /* + * The only addresses above 2^63 are kernel addresses of a 64-bit + * kernel. Note that addresses are unsigned so that on a 32-bit system + * all addresses including kernel addresses are less than 2^32. In + * that case (32-bit system), if the kernel mapping is unknown, all + * addresses will be assumed to be in user space - see + * machine__kernel_ip(). + */ + machine->kernel_start = 1ULL << 63; + if (map) { + err = map__load(map, machine->symbol_filter); + if (map->start) + machine->kernel_start = map->start; + } + return err; +} |