vdso handling

Metzger, Markus T markus.t.metzger@intel.com
Wed Mar 19 08:11:00 GMT 2014


> -----Original Message-----
> From: Alan Modra [mailto:amodra@gmail.com]
> Sent: Wednesday, March 19, 2014 12:10 AM

> Now, p_align is generally set from the page size if using GNU ld, but
> I'm wondering if your vdso somehow doesn't have that property.  Can
> you show us your vdso readelf -e output?

ELF Header:
  Magic:   7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00 
  Class:                             ELF64
  Data:                              2's complement, little endian
  Version:                           1 (current)
  OS/ABI:                            UNIX - System V
  ABI Version:                       0
  Type:                              DYN (Shared object file)
  Machine:                           Advanced Micro Devices X86-64
  Version:                           0x1
  Entry point address:               0xffffffffff700700
  Start of program headers:          64 (bytes into file)
  Start of section headers:          4320 (bytes into file)
  Flags:                             0x0
  Size of this header:               64 (bytes)
  Size of program headers:           56 (bytes)
  Number of program headers:         4
  Size of section headers:           64 (bytes)
  Number of section headers:         18
  Section header string table index: 17

Section Headers:
  [Nr] Name              Type            Address          Off    Size   ES Flg Lk Inf Al
  [ 0]                   NULL            0000000000000000 000000 000000 00      0   0  0
  [ 1] .hash             HASH            ffffffffff700120 000120 000040 04   A  2   0  8
  [ 2] .dynsym           DYNSYM          ffffffffff700160 000160 000108 18   A  3   2  8
  [ 3] .dynstr           STRTAB          ffffffffff700268 000268 00005e 00   A  0   0  1
  [ 4] .gnu.version      VERSYM          ffffffffff7002c6 0002c6 000016 02   A  2   0  2
  [ 5] .gnu.version_d    VERDEF          ffffffffff7002e0 0002e0 000038 00   A  3   2  8
  [ 6] .note             NOTE            ffffffffff700318 000318 00003c 00   A  0   0  4
  [ 7] .eh_frame_hdr     PROGBITS        ffffffffff700354 000354 00002c 00   A  0   0  4
  [ 8] .eh_frame         PROGBITS        ffffffffff700380 000380 0000e8 00   A  0   0  8
  [ 9] .dynamic          DYNAMIC         ffffffffff700468 000468 0000f0 10  WA  3   0  8
  [10] .rodata           PROGBITS        ffffffffff700558 000558 000020 01 AMS  0   0  8
  [11] __bug_table       PROGBITS        ffffffffff700578 000578 000018 00   A  0   0  1
  [12] .discard          PROGBITS        ffffffffff700590 000590 000012 00  WA  0   0  1
  [13] .altinstructions  PROGBITS        ffffffffff7005a2 0005a2 0000d8 00   A  0   0  1
  [14] .altinstr_replacement PROGBITS        ffffffffff70067a 00067a 000036 00  AX  0   0  1
  [15] .text             PROGBITS        ffffffffff700700 000700 0008fd 00  AX  0   0 16
  [16] .comment          PROGBITS        0000000000000000 000ffd 00002c 01  MS  0   0  1
  [17] .shstrtab         STRTAB          0000000000000000 001029 0000b7 00      0   0  1
Key to Flags:
  W (write), A (alloc), X (execute), M (merge), S (strings), l (large)
  I (info), L (link order), G (group), T (TLS), E (exclude), x (unknown)
  O (extra OS processing required) o (OS specific), p (processor specific)

Program Headers:
  Type           Offset   VirtAddr           PhysAddr           FileSiz  MemSiz   Flg Align
  LOAD           0x000000 0xffffffffff700000 0xffffffffff700000 0x000ffd 0x000ffd R E 0x1000
  DYNAMIC        0x000468 0xffffffffff700468 0xffffffffff700468 0x0000f0 0x0000f0 R   0x8
  NOTE           0x000318 0xffffffffff700318 0xffffffffff700318 0x00003c 0x00003c R   0x4
  GNU_EH_FRAME   0x000354 0xffffffffff700354 0xffffffffff700354 0x00002c 0x00002c R   0x4

 Section to Segment mapping:
  Segment Sections...
   00     .hash .dynsym .dynstr .gnu.version .gnu.version_d .note .eh_frame_hdr .eh_frame .dynamic .rodata __bug_table .discard .altinstructions .altinstr_replacement .text 
   01     .dynamic 
   02     .note 
   03     .eh_frame_hdr

Regards,
Markus.
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