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authorAdrian Hunter <adrian.hunter@intel.com>2013-08-07 14:38:51 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2013-08-07 17:35:33 -0300
commit8e0cf965f95edd41df11cca50b92b4cb6ea8d80a (patch)
tree08c55f2c5caaccf3c479a71fb730594164e8e23c /tools/perf/util/symbol-elf.c
parent0131c4ec794a7409eafff0c79105309540aaca4d (diff)
perf symbols: Add support for reading from /proc/kcore
In the absence of vmlinux, perf tools uses kallsyms for symbols. If the user has access, now also map to /proc/kcore. The dso data_type is now set to either DSO_BINARY_TYPE__KCORE or DSO_BINARY_TYPE__GUEST_KCORE as approprite. This patch breaks the "vmlinux symtab matches kallsyms" test. That is fixed in a following patch. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1375875537-4509-8-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/symbol-elf.c')
-rw-r--r--tools/perf/util/symbol-elf.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index 3eaa7b486e2..a7b9ab55738 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -951,6 +951,57 @@ out_elf_end:
return err;
}
+static int elf_read_maps(Elf *elf, bool exe, mapfn_t mapfn, void *data)
+{
+ GElf_Phdr phdr;
+ size_t i, phdrnum;
+ int err;
+ u64 sz;
+
+ if (elf_getphdrnum(elf, &phdrnum))
+ return -1;
+
+ for (i = 0; i < phdrnum; i++) {
+ if (gelf_getphdr(elf, i, &phdr) == NULL)
+ return -1;
+ if (phdr.p_type != PT_LOAD)
+ continue;
+ if (exe) {
+ if (!(phdr.p_flags & PF_X))
+ continue;
+ } else {
+ if (!(phdr.p_flags & PF_R))
+ continue;
+ }
+ sz = min(phdr.p_memsz, phdr.p_filesz);
+ if (!sz)
+ continue;
+ err = mapfn(phdr.p_vaddr, sz, phdr.p_offset, data);
+ if (err)
+ return err;
+ }
+ return 0;
+}
+
+int file__read_maps(int fd, bool exe, mapfn_t mapfn, void *data,
+ bool *is_64_bit)
+{
+ int err;
+ Elf *elf;
+
+ elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
+ if (elf == NULL)
+ return -1;
+
+ if (is_64_bit)
+ *is_64_bit = (gelf_getclass(elf) == ELFCLASS64);
+
+ err = elf_read_maps(elf, exe, mapfn, data);
+
+ elf_end(elf);
+ return err;
+}
+
void symbol__elf_init(void)
{
elf_version(EV_CURRENT);