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Date: Tue, 17 Feb 2015 07:49:55 +0100 (CET)
From: Igmar Palsenberg <igmar@...senberg.com>
To: musl@...ts.openwall.com
Subject: Re: Executable crashes at __libc_start_main
> Finally I got a core dump and the program crashes here:
>
> 88c8: e1550007 cmp r5, r7
> 88cc: 2a000003 bcs 88e0 <__libc_start_main+0x1b0>
> 88d0: e4953004 ldr r3, [r5], #4
> 88d4: e1a0e00f mov lr, pc
> 88d8: e12fff13 bx r3
> 88dc: eafffff9 b 88c8 <__libc_start_main+0x198>
>
> In the 88d8 instruction to be more exact. Seems that R3 is holding the
> value 0xc8000082!!! Where is that 0xC8 at the beginning comming from?
> The PC reported by the core dump is 0xc8000080 which I guess it's just
> the vlaue of R3 aligned to 4 byte boundary. R5 points to the right
> place, it's just the value loaded by the load. Could it be that
> something corrupts my ELF? Could it be the OS being really dumb at
> loading the ELF? It's a pretty old kernel, 2.6.21.
You're absolutely sure your toolchain is OK ? Hard to track issues like
this are usually caused by a wrong toolchain, and ARM has some nice quirks
when it comes to this.
Igmar
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