From 15acef6c3727cfe0bc9d1f6b273cca46689e8cd8 Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Tue, 22 May 2018 13:54:41 +0300 Subject: [PATCH] perf kcore_copy: Layout sections In preparation to add more program headers, layout the relative offset of each section. Signed-off-by: Adrian Hunter Cc: Alexander Shishkin Cc: Andi Kleen Cc: Andy Lutomirski Cc: Dave Hansen Cc: H. Peter Anvin Cc: Jiri Olsa Cc: Joerg Roedel Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: x86@kernel.org Link: http://lkml.kernel.org/r/1526986485-6562-14-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo --- 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, -- 2.30.2