[tip:perf/core] perf kcore_copy: Iterate phdrs

tip-bot for Adrian Hunter
2018-05-24T05:44:15Z

Commit-ID: d2c959803c8843f64e419d833dc3722154c82492
Gitweb: https://git.kernel.org/tip/d2c959803c8843f64e419d833dc3722154c82492
Author: Adrian Hunter <adrian.hunter@intel.com>
AuthorDate: Tue, 22 May 2018 13:54:42 +0300
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Wed, 23 May 2018 10:26:42 -0300

perf kcore_copy: Iterate phdrs

In preparation to add more program headers, iterate phdrs instead of
assuming there is only one for the kernel text and one for the modules.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86@kernel.org
Link: http://lkml.kernel.org/r/1526986485-6562-15-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/symbol-elf.c | 25 ++++++++++---------------
1 file changed, 10 insertions(+), 15 deletions(-)

diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index 3e76a0efd15c..91b8cfb045ec 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -1701,10 +1701,11 @@ int kcore_copy(const char *from_dir, const char *to_dir)
struct kcore kcore;
struct kcore extract;
int idx = 0, err = -1;
- off_t offset, sz, modules_offset = 0;
+ off_t offset, sz;
struct kcore_copy_info kci = { .stext = 0, };
char kcore_filename[PATH_MAX];
char extract_filename[PATH_MAX];
+ struct phdr_data *p;

INIT_LIST_HEAD(&kci.phdrs);

@@ -1733,14 +1734,10 @@ int kcore_copy(const char *from_dir, const char *to_dir)
gelf_fsize(extract.elf, ELF_T_PHDR, kci.phnum, EV_CURRENT);
offset = round_up(offset, page_size);

- if (kcore__add_phdr(&extract, idx++, offset, kci.kernel_map.addr,
- kci.kernel_map.len))
- goto out_extract_close;
+ kcore_copy__for_each_phdr(&kci, p) {
+ off_t offs = p->rel + offset;

- if (kci.modules_map.addr) {
- modules_offset = offset + kci.kernel_map.len;
- if (kcore__add_phdr(&extract, idx, modules_offset,
- kci.modules_map.addr, kci.modules_map.len))
+ if (kcore__add_phdr(&extract, idx++, offs, p->addr, p->len))
goto out_extract_close;
}

@@ -1748,14 +1745,12 @@ int kcore_copy(const char *from_dir, const char *to_dir)
if (sz < 0 || sz > offset)
goto out_extract_close;

- if (copy_bytes(kcore.fd, kci.kernel_map.offset, extract.fd, offset,
- kci.kernel_map.len))
- goto out_extract_close;
+ kcore_copy__for_each_phdr(&kci, p) {
+ off_t offs = p->rel + offset;

- if (modules_offset && copy_bytes(kcore.fd, kci.modules_map.offset,
- extract.fd, modules_offset,
- kci.modules_map.len))
- goto out_extract_close;
+ if (copy_bytes(kcore.fd, p->offset, extract.fd, offs, p->len))
+ goto out_extract_close;
+ }

if (kcore_copy__compare_file(from_dir, to_dir, "modules"))
goto out_extract_close;