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perf kcore_copy: Calculate offset from phnum

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In preparation to add more program headers, calculate offset from the
number of phdrs.

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/1526986485-6562-13-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2018-05-22 13:54:40 +03:00 committed by Arnaldo Carvalho de Melo
parent 6e97957d3d
commit c9dd1d8949
1 changed files with 5 additions and 1 deletions
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6
tools/perf/util/symbol-elf.c
View File

@ -1682,7 +1682,7 @@ 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 = page_size, sz, modules_offset = 0;
off_t offset, sz, modules_offset = 0;
struct kcore_copy_info kci = { .stext = 0, };
char kcore_filename[PATH_MAX];
char extract_filename[PATH_MAX];
@ -1710,6 +1710,10 @@ int kcore_copy(const char *from_dir, const char *to_dir)
if (kcore__copy_hdr(&kcore, &extract, kci.phnum))
goto out_extract_close;
offset = gelf_fsize(extract.elf, ELF_T_EHDR, 1, EV_CURRENT) +
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;