[Bug ports/13109] New: On mips64, the statfs64() does not work.

["rongqing.li at windriver dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=13109

             Bug #: 13109
           Summary: On mips64, the statfs64() does not work.
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: critical
          Priority: P2
         Component: ports
        AssignedTo: roland@gnu.org
        ReportedBy: rongqing.li@windriver.com
    Classification: Unclassified


We should weak-alias statfs64 to statfs on mips64 as on x86_64

==================================
//This program does not work

main()
{
  statfs64("/tmp", sfbuf);
}
==================================
//This program does not work when we define _FILE_OFFSET_BITS=64

#define _FILE_OFFSET_BITS=64
#include <*.h>
main()
{
  statfs("/tmp", sfbuf);
}
==================================
//The below is elf information

-bash-3.2$ readelf -h ./mabi_64/libc.so
ELF Header:
  Magic:   7f 45 4c 46 02 02 01 00 00 00 00 00 00 00 00 00
  Class:                             ELF64
  Data:                              2's complement, big endian
  OS/ABI:                            UNIX - System V
  ABI Version:                       0
  Type:                              DYN (Shared object file)
  Machine:                           MIPS R3000
  Flags:                             0x60000007, noreorder, pic, cpic, mips64
  ....

========================================
//The statfs and statfs64 have different offset, which means different function
//but on x86-64, the offset of statfs and statfs64 are same

-bash-3.2$ readelf -s ./mabi_64/libc.so |grep statfs
  6746: 00000000000ee39c    28 FUNC    GLOBAL DEFAULT   11 __statfs
  6806: 00000000000ee400     8 FUNC    WEAK   DEFAULT   11 statfs64
  6821: 00000000000ee39c    28 FUNC    WEAK   DEFAULT   11 statfs


-bash-3.2$ objdump -dS ./mabi_64/libc.so

00000000000ee39c <__statfs>:
   ee39c:       2402140e        li      v0,5134
   ee3a0:       0000000c        syscall
   ee3a4:       14e0fff6        bnez    a3,ee380 <__fxstatat64+0xb0>
   ee3a8:       00000000        nop
   ee3ac:       03e00008        jr      ra
   ee3b0:       00000000        nop
        ...
   ee3c0:       0380082d        move    at,gp
   ee3c4:       3c1c000a        lui     gp,0xa
   ee3c8:       279c6b14        addiu   gp,gp,27412
   ee3cc:       0399e02d        daddu   gp,gp,t9
   ee3d0:       df998588        ld      t9,-31352(gp)
   ee3d4:       03200008        jr      t9
   ee3d8:       0020e02d        move    gp,at

00000000000ee400 <statfs64>:
   ee400:       03e00008        jr      ra
   ee404:       00000000        nop
        ...

=========================================================
The statfs64 in libc does not any work since the linux kernel
does not implement the statfs64 syscall when define _MIPS_SIM_ABI64,

the reason why statfs64 does not implement is that statfs
has equal function to statfs64 on mips64, I think.

=========================================================

On x86-64, statfs64 in libc has its true implementation since
the statfs64 syscall exist in kernel.

But in libc.so, it is weak-alias to statfs at last, not call
the true statfs64 syscall.

The below information comes from common_pc_64.

 readelf -s libc-2.11.1.so  |grep statfs
  1241: 00000000000c2350    37 FUNC    GLOBAL DEFAULT   11
__statfs@@GLIBC_2.2.5
  1564: 00000000000c2350    37 FUNC    WEAK   DEFAULT   11 statfs@@GLIBC_2.2.5
  1761: 00000000000c2350    37 FUNC    WEAK   DEFAULT   11
statfs64@@GLIBC_2.2.5

====================================================
I think the mips64 should have the same result.

====================================================
when call make-syscalls.sh to configure the glibc, I found the
 syscalls.list on ./sysdeps/unix/sysv/linux/wordsize-64/ never
be used.

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