[PATCH V2 16/20] perf buildid-cache: kcore_copy: Layout sections

[Adrian Hunter]

In preparation to add more program headers, layout the relative offset of
each section.

Signed-off-by: Adrian Hunter <adrian.hun...@intel.com>
---
 tools/perf/util/symbol-elf.c | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index 4aec12102e19..3e76a0efd15c 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -1386,6 +1386,7 @@ static off_t kcore__write(struct kcore *kcore)
 
 struct phdr_data {
        off_t offset;
+       off_t rel;
        u64 addr;
        u64 len;
        struct list_head node;
@@ -1404,6 +1405,9 @@ struct kcore_copy_info {
        struct list_head phdrs;
 };
 
+#define kcore_copy__for_each_phdr(k, p) \
+       list_for_each_entry((p), &(k)->phdrs, node)
+
 static int kcore_copy__process_kallsyms(void *arg, const char *name, char type,
                                        u64 start)
 {
@@ -1518,11 +1522,21 @@ static int kcore_copy__read_maps(struct kcore_copy_info 
*kci, Elf *elf)
        if (kci->modules_map.len)
                list_add_tail(&kci->modules_map.node, &kci->phdrs);
 
-       kci->phnum = !!kci->kernel_map.len + !!kci->modules_map.len;
-
        return 0;
 }
 
+static void kcore_copy__layout(struct kcore_copy_info *kci)
+{
+       struct phdr_data *p;
+       off_t rel = 0;
+
+       kcore_copy__for_each_phdr(kci, p) {
+               p->rel = rel;
+               rel += p->len;
+               kci->phnum += 1;
+       }
+}
+
 static int kcore_copy__calc_maps(struct kcore_copy_info *kci, const char *dir,
                                 Elf *elf)
 {
@@ -1558,7 +1572,12 @@ static int kcore_copy__calc_maps(struct kcore_copy_info 
*kci, const char *dir,
        if (kci->first_module && !kci->last_module_symbol)
                return -1;
 
-       return kcore_copy__read_maps(kci, elf);
+       if (kcore_copy__read_maps(kci, elf))
+               return -1;
+
+       kcore_copy__layout(kci);
+
+       return 0;
 }
 
 static int kcore_copy__copy_file(const char *from_dir, const char *to_dir,
-- 
1.9.1