Date: Thu, 26 Aug 1999 03:21:24 +1000 From: Bruce Evans <bde@zeta.org.au> To: bde@zeta.org.au, marcel@scc.nl Cc: emulation@FreeBSD.ORG Subject: Re: SIGBUS for threaded Linux binaries (glibc2.1) [PSL_AC related?] Message-ID: <199908251721.DAA25993@godzilla.zeta.org.au>
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>> This means that the stack is misaligned. This seems to be an emulator
>> bug. The stack is also misaligned for an old version of Linux `cat'
>> when I attach to it while it is waiting for input.
>
>You're right. `linux_sigcode' in linux_locore.s doesn't have the 'right'
>size. Consequently `linux_szsigcode' is no multiple of 4 which results in a
>misaligned stack. I'll commit the fix shortly.
This is ELF breakage. I've even noticed the problem before. `.align 2'
should be `.p2align 2', or better, ALIGN_TEXT as in locore.s.
The committed fix is wrong. `.align 4' gives 16-byte alignment, which
is harmless but bogotifies the comment. Why not use the standard macro?
There are also broken .align statements in:
apic_ipl.s (two .align 2's, one with a comment saying that things MUST
be 32-bit aligned)
svr4_locore.s (same bugs as in linux_locore.s).
There are also dubious .align statements in:
alpha/locore.s (.align 3)
alpha/prom_disp.s (.align 4)
At least the first is apparently a power of 2 aligne statement and should
be spelled .p2align.
Bruce
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