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Message-ID: <20150524161844.GM17573@brightrain.aerifal.cx>
Date: Sun, 24 May 2015 12:18:44 -0400
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: Trouble compiling musl for MIPS softfloat
On Sun, May 24, 2015 at 02:45:40PM +0200, Szabolcs Nagy wrote:
> i get an assembler warning for the crt asm though:
>
> {standard input}:32: Warning: macro instruction expanded into multiple instructions in a branch delay slot
>
> for this insn:
>
> and $sp, $sp, -8
>
> which turns into
>
> 38: 2401fff8 li at,-8
> 3c: 03a1e824 and sp,sp,at
>
> (but this is not soft-float related, just the new start code in 1.1.9)
This looks like a potentially serious bug, omitting stack alignment.
It shouldn't matter as long as crt_arch.h is only used in dlstart.lo
(where the kernel normally gives an aligned stack pointer to begin
with) but I want to remove crt/*/crt1.s within the next couple release
cycles, and then it would matter.
Rich
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