3 gold testcases...

David Miller davem@davemloft.net
Tue Apr 8 22:41:00 GMT 2008


I'm now down to three testcase failures with my sparc
32-bit target on gold.

I've analyzed each one, and they really aren't sparc target
bugs per-se, but rather testcases that need some tweaks of
some sort:

1) justsyms puts a string at 0x10000 hoping that will be
   out of the way and not in some mapped region of the
   executable image so that it will generate a segfault.

   This happens to be where the .text gets mapped so the
   segfault doesn't happen and the testcase fails.

   Program Headers:
     Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
    ...
     LOAD           0x000000 0x00010000 0x00010000 0x0086c 0x0086c R E 0x2000
    ...
   Symbol table '.symtab' contains 53 entries:
      Num:    Value  Size Type    Bind   Vis      Ndx Name
    ...
       52: 00010000    16 OBJECT  GLOBAL DEFAULT  ABS justsyms_string

2) script_test_2 fails because of the assertion:

   assert(reinterpret_cast<uintptr_t>(start_test_area_1 + 48 + 7 + 4)
	 == reinterpret_cast<uintptr_t>(start_data));

   It assumes that the string will only consume 7 bytes, but on
   Sparc strings are emitted by the compiler with an ".align 8"
   directive, and thus the size consumed by the string is rounded
   up to 8 bytes.

3) script_test_3 fails because the PT_LOAD segments created overlap
   within a page, and the kernel thus refuses to load the binary.

   Actually, if I run the program as:

	bash$ /lib/ld-linux.so.2 ./script_test_3

   it works, so I suppose the PT_LOAD mapping rules of the dynamic
   linker are more relaxed than that of the kernel.

  Section Headers:
    [Nr] Name              Type            Addr     Off    Size   ES Flg Lk Inf Al
    [ 0]                   NULL            00000000 000000 000000 00      0   0  0
    [ 1] .interp           PROGBITS        10000000 010000 000013 00   A  0   0  1
 ...
    [14] .text             PROGBITS        100004e0 0104e0 000b48 00  AX  0   0 32
    [15] .text             PROGBITS        10001028 011028 0002a8 00  AX  0   0  4

   Program Headers:
     Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
     INTERP         0x010000 0x10000000 0x10000000 0x004c8 0x004c8 R   0x8
         [Requesting program interpreter: /lib/ld-linux.so.2]
     LOAD           0x000000 0x0fff0000 0x0fff0000 0x11398 0x11398 R E 0x2000
     LOAD           0x011400 0x10101400 0x10101400 0x001e0 0x001e0 RWE 0x2000
     LOAD           0x011600 0x10201600 0x10201600 0x00000 0x00088 RW  0x2000
     DYNAMIC        0x011400 0x10101400 0x10101400 0x000d0 0x000d0 R   0x4



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