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Subject[PATCH V3 13/17] perf buildid-cache: kcore_copy: Layout sections
Date
In preparation to add more program headers, layout the relative offset of
each section.

Signed-off-by: Adrian Hunter <adrian.hunter@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
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