Hi,
x0152532@unx0152532:~/mydroid$ readelf -l ./linker
Elf file type is EXEC (Executable file)
Entry point 0xb0001000
There are 5 program headers, starting at offset 52
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
LOAD 0x0000d4 0x00000000 0xb0000000 0x00000 0x00000 R 0x1000
LOAD 0x001000 0xb0001000 0xb0001000 0x073bc 0x073bc R E 0x1000
LOAD 0x009000 0xb0009000 0xb0009000 0x0068c 0x0969c RW 0x1000
GNU_STACK 0x000000 0x00000000 0x00000000 0x00000 0x00000 RW 0
EXIDX 0x008004 0xb0008004 0xb0008004 0x003b8 0x003b8 R 0x4
Section to Segment mapping:
Segment Sections...
00
01 .text .rodata .ARM.extab .ARM.exidx
02 .preinit_array .init_array .fini_array .ctors .data.rel.ro .got
.data .bss
03
04 .ARM.exidx
Here you are. Thanks.
On Tue, May 3, 2011 at 3:22 PM, Tom Hughes <[email protected]> wrote:
> On 03/05/11 14:07, Wan Mohd Fairuz Wan Ismail wrote:
>
> > The situation:
> > The function load_ELF (elf.c) will try to load the executable and the
> > interpreter to the memory. For android's /system/bin/linker, the
> > calculated interp_size value is 2952865436.
> >
> > The formula end = (iph->p_vaddr - interp_addr) + iph->p_memsz; gives
> > us 0xb001269c = (0xb0009000 - 0x0) + 0x969c so that's why we have
> > interp_size as big as 2.9GB. So I tried to do interp_size = end &
> > 0xFFFFF.. There is no more UME 22 Error but I got a Segmentation fault
> > (the program works fine alone).
>
> Basically valgrind is trying to cheat, and instead of mapping each LOAD
> segment in the ELF file separately it is trying to map one block of
> contiguous memory and then load each segment at the correct offset in
> that block.
>
> Unfortunately it seems that the Android interpreter is linked in such a
> way that the load segments are a long way apart, so it winds up trying
> to allocate a very large block of memory, most of which won't be used.
>
> If you can run readelf then try "readelf -l /system/bin/linker" and let
> us see the output - you may have to copy the linker off onto a
> conventional system and run readelf there.
>
> Tom
>
> --
> Tom Hughes ([email protected])
> http://compton.nu/
>
--
Wan Mohd Fairuz WAN ISMAIL
OMAP System Multimedia Integration Team (Trainee)
Texas Instrument France
[email protected]
+33 (0)4 93 22 20 16
+33 (0)6 43 46 13 39
15 Le Palais des Fleurs,
74 Boulevard Raymond Poincare,
06160 Juan les Pins, FRANCE.
http://www.watt.com.my
+6 017 2071591
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